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PLC-1710-7, 1760-7

1. To align A B PLC 1710 7 1760 7 1760L fe PLC 1710 7 1760 7 To align _30 Adjustment Procedures Results of Improper Adjustment For PLC 1710 and PLC 1760 Adjust the graduations of the feed adjusting dial to 6 Loosen the window plate setscrew 1 position on the rear of the sewing machine and remove the window plate Loosen the top feed rod hinge screw nut so that the position of the cam rod boss can be adjusted to the bottom section of the oblong hole of the top feed rear arm Tighten the upper feed rod hinge screw nut Loosen the top feed cam setscrews 2 positions Under the condition that the alternate momentum amount is unified move and adjust the top feed cam so that a timing can be secured to start rising of the presser foot when the center of the needle hole attains the top face of the throat plate while the needle and the feed foot are lowering In this state firmly tighten the top feed cam setscrews 2 positions For more details refer to 3 10 2 Alternate momentum amount Guideline When the center of the needle hole attains the top face of 6 the throat plate while the needle and the feed foot are lowering the first screw of the
2. 2 2 Adjustment amount of thread take up spring 2 A The tension is too weak because the stroke is too long Shorten the stroke to make the tension stronger 00T Cause 1 Cause 2 Check Procedure and Corrective Measures Replace the moving knife and the counter knife with new ones Adjust the position of the moving knife Re adjust the synchronizer timing Re adjust the thread trimming cam Replace the thread trimming solenoid Use a specified thread Re adjust the timing for the thread trimming cam Adjust the tension of the needle thread Decrease the thread tension controlled by the tension controller No 1 Adjust the tension of the bobbin thread Re adjust the knife pressure Replace the counter knife with new ones Adjust the counter knife position and the knife pressure Perform wiring properly The air pressure is too low Adjust the air pressure between 0 45 and 0 5 MPa Replace the cylinder Trim the thread above cloth Trim the thread while pulling the wo
3. 21356407 Cylinder stay rear S S6151040SP Setscrew CM300200001 Finger injury caution seal HX00295000A Wire mark 2 HX00295000B Wire mark 3 40038906 Air device P Assy SK3415001SE Wood screw 40038722 Filter regulator Assy SK3482501SE Wood screw Po gt i po I N BT kit for PLC 1710 1760 Kit Item No 40040415 Contents List C D E F Z 0 Part No Names of part 22656003 Lever spring hanger SS4120615SP Setscrew 22952501 Reverse feed lever stopper SS7111810SP Setscrew 10120004 Lever return spring hanger 22656102 Reverse feed shaft link SS7120760SP Pushing screw 13515606 Lever return spring o CO NID On A Co N 40040660 Window plate Assy 40043357 Window plate H PA320150200 Reverse feed cylinder SM6061602TP Setscrew WP0641601SD Washer 21348602 Cylinder connecting screw NM6060003SC Nut 21348503 Reverse feed link installing base S7151210SP Setscrew 21348701 Reverse feed link SD0800352SP Hinge screw PJ301065104 Straight joint PX015101000 Muffler 21349105 Cylinder gasket HX002950000 Wire mark 1 40024849 5 gang switch Assy SS7110840SP Setscrew HX00123000A Cable
4. 3 Clearance between the throat plate and the inner hook clamp section Standard Adjustment PLC 1710 PLC 1760 PLC 1710 7 PLC 1760 7 PLC 1760L PLC 1710 PLC 1760 PLC 1710 7 PLC 1760 7 PLC 1760L PLC 1710 PLC 1760 PLC 1710 7 PLC 1760 7 PLC 1760L Model Dimension A PLC 1710 PLC 1710 7 PLC 1760 PLC 1760 7 PLC 1760L 1 1 0 1mm 1 0 0 1mm 10 Adjustment Procedures Results of Improper Adjustment 6 Loosen the throat plate setscrews 2 positions and remove the throat plate Loosen the throat plate holder setscrews 1 needle 6 positions 2 needle 10 positions Remove the throat plate holder 2 pcs Slightly loosen the eccentric roller hinge setscrew 2 positions that is attached to the throat plate holder 2 pcs Turn the eccen tric roller 2 positions and adjust the distance between the top plane of the throat plate holder 2 pcs and the bottom plane of the eccentric roller 2 positions until the clearance amounts to Di mension A between the throat plate inner hook clamp section and the top plane of inner hook Fix the throat plate holder 2 pcs with the throat plate holder set screws 1 needle 6 positions 2 needle 10 positions Fix the throat plate with the throat plate setscrews 2 positions
5. 3 Installing the reverse feed lever PLC 1710 1760 0 5 62 Caution 1 The auto reverse feed device can be mounted only on the sewing machine that is equipped with the auto presser lifting device 2 Prior to the work confirm that the motor power supply has been turned OFF 3 This work should be carried out in the state that the air pressure in the regulator is zero 1 Removing the window plate 1 Remove the window plate B setscrews 5 positions which are located in the arm opposite the worker side Remove the window plate B and the window plate gasket B Removing the reverse feed lever PLC 1710 1760 For the PLC 1710 and 1760 loosen each setscrew of the belt cover to remove the belt cover Then loosen the reverse feed lever setscrews 2 positions to remove the reverse feed lever Automatic reverse feed device Deletion parts list Part No Names of part Q ty 21331806 Window plate B 1 S6120930SP Reverse feed lever setscrew 2 Installing the reverse feed lever PLC 1710 1760 Mount the lever spring hanger on the removed reverse feed lever using the setscrew 1 position Install the reverse feed lever stopper on the arm with the setscrew 1 position Mount the lever return spring hanger on the arm The lever spring hanger has been mounted on the reverse feed lever as per 1 above Insert this lever in the reverse feed lever shaft and
6. cecccccsseeeeneeeeeeeeeeeeeseeeeeeeeeeeensaneeeeeneeeeees 64 5 5 gang switch mounting sain sectecteciaicccattiee wi acid scenatined sti eases wuskiawendensdednedzateateteagxraenhtonedaaesases 64 6 Installation of the air related device 2 2 eeceeeeeeeeeeeeeeeeeeeneeeneeeeeeseeeeeeneeeneeaneeeeenenees 66 3 DL device PLC 1760L only sass ccccketcececaias cvaunstsetes Sands rasan hates eattavadesiacacncwcdcsuasesaceenbieesbacsaatiocs 68 1 Installing the DL device ccsseciiesiznuaslteswiveniiaeateseitvatanuatenueu ana tewalddnaaduacsnwatenmnuteadandantaneieats 68 2 Installation of the air related devices ssssssssssnunnnunnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nanena 72 3 Knee switch mounting sssssesssnnnunnnnunnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnaman ennn 74 4 List of optional ATES einna aii ataasccccncatiadencats Seanaca addi wiaradie scuinedouiiafa tes ssanuadcatsnaatsusaniasuuwedsdutavainds 76 5 Gauge replacement for the 2 needle sewing Machine ecceeeeeeeeeees 78 6 Replacement of the consumable parts cccccceeeeeeeeeeeeseeeeeeeseeeeeeeeeeeeeeeeees 80 1 HOOK replacement i ina aara aaa a aa a a a a aaa Aa aa a deevsersuereseneestnenrnaceensned 80 2 Replacing the moving knife PLC 1710 7 1760 7 cccccccsssssseeeeeeeseseeeeeeeeeeseeeeeeeeseenes 84 3 Replacing the counter knife PLC 1710 7 1760 7 cccccccssssseeseeeeeee
7. Caution 1 For the adjustment of 2 needle sewing machines com pare the clearances of Dimension A between the right and left hooks The side with a smaller clearance should be adjusted to Dimension A The distance between the top plane of the throat plate holder 2 pcs and the bottom end of the eccentric roller 2 positions should be adjusted so that the same distance can be secured by the front and rear throat plate holders 2 pcs If there is difference in distances between front and rear the throat plate comes to be positioned slantwise when it is mounted on the throat plate holder 2 pcs e o Stitch skipping or needle breakage will be caused o Thread breakage will be caused o Uneven stitching will be caused 4 Height of the feed dog Standard Adjustment Model Dimension A PLC 1710 PLC 1710 7 0 6 to 0 7mm PLC 1760 PLC 1760 7 0 7 to 0 9mm PLC 1760L 0 9 to 1 1mm o PLC 1710 7 PLC 1760 7 PLC 1710 PLC 1760 PLC 1760L 12 Adjustment Procedures Results of Improper Adjustment For PLC 1710 7 and 1760 7 Adjust the graduations of the feed adjusting dial to 0 Turn the hand wheel and stop it where the amount of protrusion of the feed dog appearing from the throat plate top face be comes maximum Loosen the setscrew 1 position of the feed bar fork and move
8. In the state of 14 above tighten the setscrew 1 position At that time apply Lock Tight 243 to the setscrew after the degreasing Mount the top feed stopper plate of the kit by means of the setscrews 2 positions Tighten the changer arm tightening screw 1 position For more details refer to the item in regard to the 3 10 1 Alternate vertical amount Mount the alternate vertical link support of the kit on the arm by means of the setscrews 2 positions A rubber plug is attached to the mounting section Therefore remove this rubber plug in advance Install the top cover with the top cover screws 6 positions Using the window plate E setscrews 4 positions mount the window plate F Assy of the kit and the window plate gasket E on the arm In this case the alternate vertical link hinge screw shall be entered in the oblong hole section of the alternate vertical link Apply grease to the hinge section of the alternate vertical link hinge screw If the alternate vertical dial is adjusted to the maximum value in advance the workability is improved be cause the alternate vertical link is protruded to the outside DL device Additional parts list List G Part No Names of part 21438106 Upper feed stopper plate 21438205 Stopper plate B SD0600454TP Alternate vertical link hinge screw 21438502 Alternate vertical link 21438601 Alternate vertical link spacer S6111610SP Setscre
9. Location Throat plate Throat plate holder A Throat plate holder B Appearance O re O Part No PLC 1710 40038970 40038969 O O 40017286 40038972 O O 40038976 O PLC 1710 7 O O O Feed dog Feeding foot Location Standard For thick thread Standard For thick thread With slit Appearance 9 Co 2 4 2 4 Q f 3 T Part No 40038971 40040294 21444559 40040295 90 23032055 o PLC 1760 1760 7 1760L PLC 1760 PLC 1760 7 O O PLC 1760L Throat plate Throat plate for lower tape Throat plate Standard For thread trimming Standard Fortheadtrimming holder Appearance T O O 40038996 40038759 40039004 40038769 40038790 40038995 40038758 40039001 40038767 40038788 40038994 40038757 40038893 40038999 40038765 40038786 40038993 40038756 40038997 40038762 40038784 Location Needle gauge PLC 1760 O PLC 1760 7 O PLC 1760L O O Feeding foot Feeding foot for guiding Needle Standard With slit Standard For L clamp DAN Location Appearance f 2 1 92 1 40038846 10783157 40038854 40038778 4003884
10. j 4 Face cover Feeding lever Pin Needle clamp Needle bar rocking base Needle bar rocking base fulcrum shaft _ 78 Adjustment Procedures 10 Loosen the needle setscrews 2 positions and remove the needle Loosen the feed foot setscrew 1 position and take out the feed foot Loosen the presser foot setscrew 1 position and take out the presser foot Let the sewing machine fall down Loosen the connecting link setscrews 2 positions PLC 1760 7 only Remove the rocking arm right hinge screw 1 position PLC 1760 7 only Loosen the rocking arm right tightning screw 1 position and the rocking arm left tightning screw 1 position and remove the rocking arm left and the connecting link 2 pcs PLC 1760 7 only Loosen the hook shaft gear setscrews 6 positions Loosen the lower shaft gear setscrews 4 positions so that the lower shaft gear can move to the right and left In this case make sure that the first screw of the lower shaft gear setscrews can never be disengaged from the flat face of the lower shaft Raise the sewing machine Caution For the PLC 1760 7 pay attention to the connecting link that is attached to the thread trimmer d
11. 10 A Needle interferes with the needle hole Increase the pressure of the presser foot edge of the throat plate Re adjust the needle entry point Cause 1 Cause 2 Check Procedure and Corrective Measures 5 Irregular Stitches 5 1 Defective hook components Oil in the hook is insufficient Lubricate the hook race Defective hook scratch dust Clean modify or replace the hook The clearance between the needle and throat plate is too small Increase the clearance The inner hook opening lever provides excessive clearance Decrease the clearance at the inner hook opening lever Hook timing is too early Retard hook timing 5 2 Defective bobbin and or inner hook Defective bobbin thread tension adjusting spring Replace the inner hook with a new one The bobbin is not engaged with the inner hook As a result the bobbin thread cannot be led smoothly Replace the bobbin or inner hook with a new one Bobbin runs idle in the inner hook Increase the idling prevention spring pressure Bobbin thread is not wound As a result the bobbin thread fails to be fed smoothly Adjust the tension of the bobbin winder or the position of the bobbin winder tension controller 2 D
12. CO NIDIA A Go Po o4 o DLT kit DL 23 Kit Item No 40040416 Contents List G H J K Z 0 CO Ni G gt OF A Gd N Part No Names of part 21438106 Upper feed stopper plate 21438205 Stopper plate B SD0600454TP Alternate vertical link hinge screw 21438502 Alternate vertical link 21438601 Alternate vertical link spacer S6111610SP Setscrew 21438700 Alternate vertical link support S4110815SP Setscrew 40040663 Window plate F Assy PA320200100 Jig cylinder PJ304065102 Elbow PX015101000 Muffler 21438403 Cylinder connecting screw SD0600403TP Hinge screw attaching to cylinder connecting screw NM6080721SE Cylinder connecting screw nut 21437207 Window plate F SM6044002TP Jig cylinder setscrew HX00295000C Wire mark 4 40040420 Solenoid valve Assy 40040672 Air hose Assy for DL 40025036 Knee switch Assy SK3514000SC Wood screw The DL kit applicable to the PLC 1760L only J7 5 Gauge replacement for the 2 needle sewing machine Standard Adjustment Rocking Rocking y gt arm lef am ea plate Hook cover ys Feed lever base
13. Let the sewing machine fall down Tighten the rocking arm R tightening screw and the rocking arm L tightening screw 1710 7 only In this case refer to 3 18 8 9 Adjusting the position of the mov ing knife Right Left 45 When the clearance is too much o There will be a failure in clamp ing the needle thread or the bob bin thread at the time of thread trimming When the clearance is too less o The moving knife may come in contact with the bobbin Standard Adjustment 2 Adjusting the position of the counter knife and knife pressure 3 Adjusting the clamp spring E E n o 2 N Adjustment Procedures Results of Improper Adjustment Let the sewing machine fall down Loosen the rocking arm R tightening screw and the rocking arm L tightening screw 1710 7 only Raise the sewing machine Loosen the counter knife installing base setscrews 1710 7 2 po sitions 1760 7 4 positions Turn the moving knife by hand and move the counter knife install ing base so that the contact position between the blade tip of the counter knife and the moving knife can be maintained 5 to 6mm from the tip of the moving knife At that time adjust the vertical positioning of the counter knife install ing base so that the blade center of the counter knife coincides with that of the moving knife
14. temporarily tighten the rocking arm right tightening screw or the rocking arm left tightening screw Raise the sewing machine Loosen the moving knife setscrew 1 position and remove the moving knife Fix the new moving knife with the moving knife setscrew 1 position Loosen the counter knife base setscrews 2 positions to make adjustments of the knife pressure For more details refer to 3 18 2 Adjusting the position of the counter knife and knife pressure Caution The knife pressure should be kept as low as possible 7 3 1 2 3 4 5 6 7 Lay down the sewing machine body and fix the rocking arm right tightening screw or the rocking arm left tightening screw In this case refer to 3 18 8 9 Adjusting the position of the moving knife Right Left Raise the sewing machine Replacing the counter knife PLC 1710 7 1760 7 Let the sewing machine fall down Loosen the rocking arm right tightening screw 1 position Loosen the rocking arm left tightening screw PLC 1760 7 only Raise the sewing machine Loosen the clamp spring setscrews 2 positions Loosen the counter knife setscrews 2 position and remove the counter knife Fix the new counter knife with the counter knife setscrew 2 position At that time let the bottom face of the counter knife come in close contact with the counter knife mounting holder Loosen the counter knife base sets
15. 1 600rpm 2 500rpm 1 2 3 4 5 6 Alternate vertical amount mm 6 5 o PLC 1710 7 1760 7 Alternate vertical amount mm o PLC 1760L MAX 1 600rpm MAX 1 800rpm Alternate vertical amount mm 102 14 Table drawing 1 Flat table a55 924 depth 35 C2 chamfering 918 through hole 10 2 Drawer stopper installing position On the botton surface The surface C1 5 chamfering 30 4 93 5 on the bottom surface A 7 depth 20 A 3 x 8 drilling RT amp Na 159 45 213 through 8 x 93 4 depth 10 390 18 910 through hole The sruface C2 chamfering 105 2 03 4 on the bottom surface depth 10 810 1200 Part No 40038940 103 MEMO gt EB We EMS EMS Accreditation IS014001 2004 i RE005 REG NO JSAE389 089 JUKI CORPORATION HEAD OFFICE The environmental management system to promote and conduct the technological and technical research the development and design of the products in which the environmental impact is consid ered the conservation of the energy and resources and the recycling in the research development design distribution sale and mainte nance service of the industrial sewing machines household sew ing machines and industrial use robots etc and in the sale and maintenance service of data entry system and in the purchase dis n tribution an
16. 1760L 26 Adjustment Procedures Results of Improper Adjustment o For PLC 1710 and PLC 1760 Adjust the graduations of the feed adjusting dial to 0 Turn the hand wheel by hand and confirm whether the vertical amount of motion is kept almost equalized between the feed foot and the presser foot If the vertical amount of motion seems to be different loosen the upper feed rear arm setscrew until equalized balancing is secured Make adjustments until the condition of A B is secured by visual check When the vertical amount of motion is too much in the feed foot 1 In the state that the feed foot is somewhat lifted loosen the upper feed rear arm setscrew and press the feed foot against the feed dog Tighten the upper feed rear arm setscrew again and examine the vertical amount of motion by turning the hand wheel When the vertical amount of motion is too much in the presser foot 1 In the state that the presser foot is somewhat lifted loosen the upper feed rear arm setscrew and press the presser foot against the throat plate Tighten the upper feed rear arm setscrew again and examine the vertical amount of motion by turning the hand wheel For PLC 1710 7 1760 7 1760L Adjust the graduations of the feed adjusting dial to 0 Set the alternate vertical dial at the graduations 3 in the case of the PLC 1710 7 and 1760 7 and at the graduation 2 in
17. Close contact 6 Connection of the rocking arm and the thread trimmer roller arm Close contact 1 Close contact 50 Adjustment Procedures Results of Improper Adjustment 5 Timing adjustment for the thread trimming cam 5 6 Let the sewing machine fall down Loosen the thread trimmer cam setscrews 2 positions that have been temporarily tightened during the positional adjustment of the thread trimmer cam Turn the hand wheel to secure a coincidence between the engraved marker point of the arm and the red engraved marker point of the hand wheel In the state that the thread trimmer cam and the safety device disc are keeping a close contact with each other turn the thread trim mer cam by hand until the thread trimmer cam roller comes to contact the R section at the beginning of the cam groove in the thread trimmer cam Firmly tighten the thread trimmer cam setscrews 2 positions Raise the sewing machine Caution Confirm that the end face of the thread trimmer cam and that of the safety device disc are keeping a close contact with each other Connection of the rocking arm and the thread trimmer roller arm Let the sewing machine fall down Loosen the connecting plate setscrews 2 positions of the thread trimming driving joint plate Keep the close contact with the rocking arm and the thread trim ming stopper Push the thread trimmer roller
18. connector CN20 Solenoid valve Assy Cord Red CN20 6 newly attached Cord Black CN20 1 Solenoid valve BT Cord Red CN20 8 already mounted Cord Black CN20 3 Solenoid valve AK Cord Red CN20 7 already mounted Cord Black CN20 2 Connect the connector CN20 with the cords of the 5 gang switch Connect the one touch joint which has been mounted as per 3 above to the DL device elbow through an air hose Check the function of the DL device 1 Connect the pipe of the air supply source and turn the motor power supply ON 2 Press the second from left switch of the 5 gang switch and confirm that the DL device is actuated DL device Additional parts list List J No Part No Names of part Q ty 40040420 Solenoid valve Assy 1 40040672 Air hose Assy for DL 1 Soe 3 Knee switch mounting _74 1 2 Mount the knee switch Assy on the bottom face of the table by means of the wood screws 2 pcs Insert the cords of the knee switch Assy in the relay cord connector CN36 14 pins connector white Cord white Insert to Pin No 4 Cord black Insert to Pin No 11 Set up the motor SC 510 For more details refer to the SC 510 Instruction Manu
19. m PLC 1710 PLC 1760 PLC 1760L 80 Adjustment Procedures PLC 1710 1760 1760L Loosen the throat plate setscrews 2 positions and remove the throat plate Loosen the feed track clamp setscrews 3 positions and remove the feed track clamp Remove the inner hook Loosen the screws 2 positions of the hook shaft base cover and remove the hook shaft base cover Loosen the inner hook guide arm tightening setscrew 1 position Loosen the hook setscrew 1 position and lift the outer hook and the inner hook guide at the same time to take out the outer hook Mount the outer hook of the new hook in the reverse procedures as for the removal of the outer hook Fix the outer hook by means of the hook setscrew 1 position At that time fix the outer hook in the state that the positioning pin of the hook shaft top face is entered in the hole of the outer hook Mount the inner hook in the outer hook Fix the feed track clamp by means of the feed track clamp setscrews 3 positions Check the timing for the needle and the hook For more details refer to 3 5 and 6 Timing between the needle and the hook Fix the throat plate with the throat plate setscrews 2 positions Check the vertical clearance between the top face of the inner hook clamp section and the throat plate For more details
20. Defective adjustment amount of moving knife Re adjust the hight Re adjust the initial position 8 B Breakage of moving knife tip Replace the moving knife with a new one 8 C Wrong bobbin thread path Run the bobbin thread in the correct route 8 D Thread trimming after thread falling Trim the thread while pulling the work in the feeding direction 4 Single yarn residue at thread trimming 4 1 Moving knife 1 A Knife wear breakage Replace the moving knife with a new ones 4 2 Counter knife 2 A Knife wear breakage Replace the counter knife with new ones 2 B Too weak knife pressure Re adjust the knife pressure 4 3 Misalignment between moving knife and counter knife Adjust the positions of the moving knife and counter knife 4 4 Defective thread trimming timing 4 A Too late timing Re adjust the timing 4 5 Deviation of work clamp foot from cloth at thread trimming 5 A The moving knife cannot hold the thread securely due to thread bending Trim the thread above cloth Trim the thread while pulling the work in the feeding direction 13 List of the sewing speeds o PLC 1710 1760 MAX 1 800rpm 6 MAX 4 MAX
21. Lmm between two thread trimmer driving joint plates 4 Refer to 5 5 Refer to 9 6 Refer to 10 11 Raise the sewing machine 55 19 Alternate vertical dial PLC 1710 7 1760 7 Standard Adjustment 1 Mounting position of the alternate vertical amount detector switch Sewing speed Alternate vertical dial Alternate Stitches Stitches vertical 6mm or Over 6mm and amount below 9mm or below 2 5mm or below 2500rpm 1800rpm Over 2 5mm and 2200rpm 1800rpm 4mm or below Over 4mm and 4 75mm or below 1800rpm 1800rpm Over 4 75mm and 1600rpm 1600rpm 6 5mm or below Detector switch of alter nate vertical amount Hole in Section A section Red White Black Graduations of the Switch Top Switch Bottom alternate vertical dial Red amp Green lines White amp Black lines 1 to 2 5 OFF OFF 2 625 to 4 OFF ON 4 125 to 4 75 ON ON 4 875 to 6 5 ON 56 Adjustment Procedures Results of Improper Adjustment PLC 1710 7 1760 7 o There may be no changes in the Turn the alternate vertical dial to adjust the graduations 1 to the sewing speed even though the marking embossed section of the top cover alternate vertical dial is turned Loosen the alternate vertical dial setscrew 1 position and re move the alternate vertical dial Be careful in this case that there is a set of pin and spring inserte
22. Thread has been wound excessively on the bobbin 5 3 The needle thread tension and the bobbin thread tension are too low Re wind the bobbin thread to the extent where the thread wound round the bobbin does not protrude from the periphery of the bobbin Increase the thread tension 5 4 Thread take up spring has not been correctly adjusted 4 A Adjustment amount of the stroke Re adjust the stroke of the thread take up spring 4 B Adjustment amount of the tension Re adjust the tension of the thread take up spring 5 5 Improper thread path 5 A Thread path is not smooth on the surface Make the thead path smooth 5 B Thread path has scratches on the surface Smoothen the thread path 5 C Thread is caught in some part of the thread path Thread path modification 5 6 Defective feed timing Re adjust the feed timing 2 Thread trimming and concerns Cause 1 Cause 2 Check Procedure and Corrective Measures 1 Stitch skipping at the start of sewing 1 1 Length of thread left at the needle tip after thread trimming is too short Abnormality in needle thread route Run the thread in the correct route to avoid abnormal tension on the needle thread Tension of the tension di
23. Upper feed for the po sition of the hinge screw The lowest point of the oblong hole in the rear arm List of the sewing speeds Alternate Stitch Stitch vertical 6mm over amount 6mm or less 9mm or less 3mm or less 2500rpm 1800rpm 3mm over TERENE TE 1800rpm 1800rpm 4mm over 6 5mm or less 1600rpm 1600rpm 83 to 84mm 24 Adjustment Procedures Results of Improper Adjustment 0 0 For PLC 1710 and PLC 1760 Loosen the window plate screw 1 position and remove the win dow plate Loosen the upper feed rod hinge screw nut Vertically move and adjust the position of the cam rod boss Tighten the upper feed rod hinge screw nut Install the window plate with the window plate setscrews 2 positions Upper section of the oblong hole Alternate vertical amount Large Lower section of the oblong hole Alternate vertical amount Small Caution The maximum revolving speed has been set according to the sewing conditions Set the maximum revolving speed according to each sewing condition so that the preset value cannot be exceeded For PLC 1710 7 1760 7 1760L Set the graduations of the alternate vertical dial at the lowest level Loosen the top cover setscrews 6 positions and remove the top cover Loosen the Alternate vertical adjusting arm setscrew 1 position The position of the alternate vertical adjusting arm pin is ma
24. all rotary horizontal hook latch type 1 6 fold all rotary horizontal hook cap type Feed mechanism Box feed Vertical shaft drive Using a timing belt Using a trimmer Cam driven pinch and cut system Lubrication Concentrated tank type oil wick lubrication manual lubrication for the surface of the hook section Lubricating oil JUKI NEW Defrix oil No 2 equivalent to ISO VG32 Space under the needle 255mm distance from the center of the presser bar to the bottom of the arm Hook shaft bed height 161 7mm Bed top plane to throat plate top plane Bed size 517mm x 178mm Knee presser lifter Provided as standard Not Provided as standard Auto presser lifter Option AK 136 Provided as standard AK 136 Option AK 136 Hand wheel size Effective diameter of V belt section 293 3mm outer diameter 160mm Effective diameter of V belt section 93 3mm Outer diameter 2175mm Motor 2P 400W 4P 400W SC 510 M51 2P 400W 4P 400W Weight gross weight 55kg 56kg 55kg 56kg 58kg Air consumption 0 3dm min ANR Working temperature humidity Temperature 5 C to 35 C Humidity 35 to 85 no condensation Supply voltage frequency Rated voltage 10 50 60Hz 2 Model Numbering system 1 PLC 1710 Model name Post bed 1 needle unsion feed lockstitch machine with a vertical axis
25. between the second and third tooth roots of the sprocket o 5 9Nem _ Third tooth crest of the sprocket This value is set at 9 8N m at the time of shipment from the factory _Al 17 Reverse feed cylinder and condensation cylinder Standard Adjustment 6 5 to 7 5mm 42 Adjustment Procedures Results of Improper Adjustment PLC 1710 7 1760 7 only Reverse feed cylinder Loosen the window plate setscrews 4 positions located behind the sewing machine Remove the window plate and the window plate gasket Loosen the window plate setscrews 5 positions and remove the window plate and the window plate gasket O Loosen the nut Adjust the distance to 7 to 8mm between the end face of the cylinder shaft and the cylinder connecting screw Tighten the nut Install the window plate and the window plate gasket with the window plate setscrews 5 positions Install the window plate and the window plate gasket with the window plate setscrews 4 positions Caution When installing the window plate and the window plate If it is not entered in the hinge gasket in the sewing machine the fork section of the screw reverse feed stitches reverse feed link has t
26. clip S S4110815SP Setscrew D2112555B00 Cord stopper fittings S6111140SP Setscrews for cord stopper fittings 40040419 Solenoid valve P Assy HK034610100 Connector 40024864 Relay cord 40040671 Air hose Assy for BT 4 po po oo PO A ap po I po apo po 6 BT kit for PLC 1760L Kit Item No 40040469 Contents List D E F No Part No Names of part 1 40040660 Window plate Assy 40043357 Window plate H PA320150200 Reverse feed cylinder SM6061602TP Setscrew WP0641601SD Washer 21348602 Cylinder connecting screw NM6060003SC Nut 21348503 Reverse feed link installing base S7151210SP Setscrew 21348701 Reverse feed link D0800352SP Hinge screw PJ301065104 Straight joint PX015101000 Muffler 21349105 Cylinder gasket HX002950000 Wire mark 1 40024849 5 gang switch Assy SS7110840SP Setscrew HX00123000A Cable clip S4110815SP Setscrew D2112555B00 Cord stopper fittings S6111140SP Setscrews for cord stopper fittings 40040419 Solenoid valve P Assy HK034610100 Connector 40024864 Relay cord 40040671 Air hose Assy for BT lt S BE _ BI BJ OY 4 po po oo co po ae J D0 J D0 Po S Se a a Nemes Nemes mes Sn Nea Nd Ree Ne Na NN Ne Na
27. hook blade tip After adjustments tighten the hook shaft base setscrews 4 positions Let the sewing machine fall down and loosen the lower shaft gear setscrews 4 positions Move the lower shaft gear so that the center of the hook shaft can coincide with that of the gear section of the lower shaft gear Temporarily tighten the lower shaft gear with the lower shaft gear set screw At that time tentatively fasten the first screw of the lower shaft gear setscrew adjusted to the flat section of the lower shaft Assume the condition of 13 again and let the center of the needle coin cide with the hook blade tip Mount the hook shaft gear and firmly tighten it by means of the hook shaft gear setscrews 6 positions At that time tighten the first screw of the hook shaft gear setscrew ad justed to the flat section of the hook shaft Loosen the lower shaft gear setscrew that has been fastened tentatively as per 17 above so that the lower shaft gear can be moved to the right and left At that time the first screw of the lower shaft gear setscrews should have been loosened to an extent that it is not disengaged from the flat section of the lower shaft Move and adjust the lower shaft gear in the direction of the arrow so that the center of the needle can coincide with the hook blade tip when the needle bar is raised by 2 5mm from the lowest position of the needle bar Tighten the
28. lower shaft gear setscrews 4 positions Raise the sewing machine Bend the hook s needle guard so that the effective amount of the hook s needle guard is adjusted to 0 1 to 0 2mm at the tip of the needle Refer to Fig A Install the throat plate holder with the throat plate holder setscrews 10 positions Install the throat plate with the setscrews 2 positions Install the hook shaft base cover with the hook shaft base cover set screws 8 positions ie 7 Adjusting the inner hook guide Standard Adjustment 1 needle 2 needle PLC 1710 PLC 1760 PLC 1710 7 PLC 1760 7 PLC 1760L Contact Model Dimension A PLC 1710 PLC 1710 7 PLC 1760 7 0 1 to 0 8mm PLC 1760 0 2 to 0 4mm PLC 1760L 0 3 to 0 5mm 18 Adjustment Procedures Results of Improper Adjustment Loosen the hook shaft base cover setscrews 1 needle 2 positions When the clearance is too much 2 needle 4 positions and remove the hook shaft base cover o Poorly tense stitches or thread For the left hook remove the hook shaft base cover located on breakage will be caused the opposite side of the worker When no clearance is secured Turn the hand wheel by hand and adjust the inner hook guide to o The inner hook or the inner the most retreat pos
29. mount the reverse feed shaft link by means of a setscrew 1 position This mounting work shall be done so that the embossed section of the reverse feed shaft link can enter the bottom side of the reverse feed lever Hook the lever return spring on the lever spring hanger and the lever return spring hanger Adjust the position of the reverse feed lever For more details refer to 3 15 Position of reverse feed lever Automatic reverse feed device Additional parts list List C No Part No Names of part Q ty 22656003 Lever spring hanger S4120615SP Setscrew 22952501 Reverse feed lever stopper S7111810SP Setscrew 10120004 Lever return spring hanger 22656102 Reverse feed shaft link S7120760SP Pushing screw 13515606 Lever return spring 8 8 6 0 96 9 63 4 Installing the automatic reverse feed device 5 5 gang switch mounting o 4 NE 64 4 Installing the automatic reverse feed device 1 Install the automatic reverse feed device together with the window plate gasket B from which the window plate Assy has been removed using the window plate setscrews 5 positions At the time of installation Section of the window plate Assy shall be entered in the hinge screw of the feed adjusting rod that is located in the arm For more details refe
30. of the counter knife and the moving knife This can re sult in the reduction of knife s op erational life When the knife pressure is too less o Poor thread trimming may occur When the clearance is too much o Since it is difficult to clamp the trimmed bobbin thread after the completion of thread trimming work stitch skipping may be caused at the beginning of sew ing When the clearance is too less o Since the clamping force is too strong for the trimmed bobbin thread after the completion of thread trimming work stitch skip ping may be caused at the be ginning of sewing o When the moving knife inter feres with the clamp spring this clamp spring may be bro ken Standard Adjustment 4 Adjust the thread trimming cam position Close contact Close contact Close contact 48 Adjustment Procedures Results of Improper Adjustment Let the sewing machine fall down Loosen the connecting plate setscrews 2 positions of the thread trimming driving joint plate In the state that the thread trimmer driving plate is pressed in the direction of the arrow to keep contact with the vertical fitting basis move the thread trimmer roller arm so that a clearance of 0 1 to 0 2mm can be secured between the thread trimmer driving plate and the cam roller While the state of 3 above is kept as it is loosen the thread trimmer cam setscrews 2 positions Keep a clos
31. part SS4110815SP Side cover setscrew 21331806 Side cover Automatic presser lifter device Additional parts list List A Z o Part No Names of part Q ty PA400150100 Auto presser lifting cylinder SM6082002SP_ Setscrew 21356506 Cylinder connecting screw NM6080001SE_ Nut D0720331SP Hinge screw 21388509 Auto presser lifting lever A 21356803 Auto presser lifting lever B SM6051002TP Hexagon socket head cap screw 21356704 Presser auto lifting lever shaft PJ304065102 Elbow 21356308 Cylinder stay front 21356407 Cylinder stay rear S6151040SP Setscrew CM300200001 Finger injury caution seal HX00295000A Wire mark 2 HX00295000B Wire mark 3 S9 8 8 8 8 8 6 90 6 9 90 9O 6 Oo al nl n a fa 59 2 Assembly of the air device Red CN1 2 7 Black CN1 1 ma 60 Install the air device P Assy on the table with the wood screw Install the filter regulator Assy on the table with wood screw Insert the connector CN50 1 of the air device P Assy in the CN50 1 block of the motor panel Motor For SC 510 Connect the air device P Assy and the filter regulator Assy through an air hose Connect the air device P Assy and the auto presser lifting cylinder through an air hose At th
32. pin and adjust the it o Direction A Reverse feed pitch increased o Direction B gt Forward feed pitch increased Tighten the feed adjusting eccentric pin setscrews 2 positions Install the top cover with the top cover screws 6 positions Guideline When the notch direction of the feed adjust eccentric pin is positioned sidewise the amount of feed becomes al most the same between forward and reverse 35 o The stitch length becomes irregular between forward and reverse feed 14 Balance Standard Adjustment PLC 1710 1760 PLC 1710 1760 PLC 1710 1760 The above illustration shows a view of the arm interior as seen from the worker side PLC 1710 1760 7 1760L PLC 1710 7 1760 7 1760L 0 8 to 1 0mm 36 Adjustment Procedures Results of Improper Adjustment For PLC 1710 1760 Loosen the top cover setscrews 6 positions and remove the top cover Loosen the balancer setscrews 2 positions Adjust Section A of the balancer to the position where it coincides with the second screw of the horizontal feed cam setscrew Fix the balancer by means of the balancer setscrews 2 positions At the time of this setup the end face of the balancer is required to keep a close contact with that of the top feed cam Ins
33. refer to 3 3 Clearance between the throat plate and the inner hook clamp section Tighten the inner hook guide arm tightening setscrew 1 position At that time make sure that there is no vertical backlash around the inner hook guide For more details refer to 3 7 Adjusting the inner hook guide 15 Mount the hook shaft base cover by means of the hook shaft base cover setscrews 2 positions Caution There is difference in the shape of the inner hook between the PLC 1710 1760 and the PLC 1760L However replacement can be carried out in the same procedures 81 r o D lt D pe Z S be o PLC 1710 7 1760 7 82 Adjustment Procedures PLC 1710 7 1760 7 Loosen the throat plate setscrews 2 positions and remove the throat plate Loosen the moving knife setscrew 1 position and remove the moving knife Loosen the feed track clamp setscrews 3 positions and remove the feed track clamp Remove the inner hook Loosen the hook shaft base cover setscrews to take out the hook shaft base cover and loosen the inner hook guide arm tightening screw 1 position Loosen the counter knife installing base setscrews 2 positions Loosen the moving knife installing base setscrews 2 positions Loosen the hook setscrew 1 position and
34. sewing machine Remove the window plate and the window plate gasket Loosen the rear needle bar rocking arm tightening screw In the state that the presser is lifted adjust the clearance between the presser bar and the upper feed bar to Dimension A at the level 47mm above the upper surface of the throat plate Since then tighten the rear needle bar rocking arm tightening screw Return the window plate and the window plate gasket to their former positions which have been removed as per 3 above Then tighten the setscrews 5 positions Caution After the rear needle bar rocking arm tightening screw has been tightened confirm that there is no thrust backlash around the needle bar rocking shaft For PLC 1710 7 and 1760 7 Adjust the graduations of the feed adjusting dial to 0 Turn the hand wheel by hand and adjust the needle bar to the lowest position Loosen the setscrews 4 positions of the window plate located behind the sewing machine Remove the window plate and the window plate gasket At that time removal can be done easily if the graduations of the alternate vertical dial have been set at the maximum level in advance Loosen the setscrews 5 positions of the winfow plate and remove the window plate and the window plate gasket Loosen the rear needle bar rocking arm tightening setscrew 1 position In the state that the presser is lifted adjust the clearance b
35. the hook shaft base cover setscrews 8 positions and remove the hook shaft base cover Lay down the sewing machine body and loosen the hook shaft gear set screws 6 positions Remove the hook shaft gear and raise the sew ing machine body Loosen the needle bar connection setscrews 2 positions If they are loosened too much at that time the needle bar will come down Therefore they should be loosened to a degree where the needle bar can be moved vertically by hand Turn the hand wheel by hand so that the needle bar is positioned 2 5mm above its lowest position Turn the hook by hand so that the center of the needle coincides with the hook blade tip Move the needle bar vertically by hand so that a distance of 2 0mm can be secured between the needle hole upper end of the needle and the hook blade tip Thighten the needle bar connection setscrew 2 positions Bend the hook s needle guard in the direction of the hook center so that the effective amount of the needle guard is reduced to 0 Loosen the right and left hook shaft base setscrews 4 positions Turn the hand wheel by hand so that the needle bar is positioned 2 5mm above its lowest position In the state that there is no contact between the needle and the hook s needle guard move and adjust the hook shaft base to the right and left so that a clearance of 0 05 to 0 1mm can be secured between the needle and the
36. throat plate and the inner hook clamp section For more details refer to 3 3 Clearance between the throat plate and the inner hook clamp section Adjust the clearance between the inner hook guide and the inner hook For more details refer to 3 7 Adjustment the inner hook guide Adjust the feed dog height For more details refer to 3 4 Height of the feed dog Adjust the vertical feed timing For more details refer to 3 11 3 Vertical feed cam phase Adjust the vertical cam timing For more details refer to 3 11 2 Top feed cam phase Mount the replacing feed foot and fix it by means of the feed foot setscrew 1 position At that time mount the feed foot so that its needle hole center coincides with the needle center Mount the replacing presser foot and fix it with the presser foot setscrew 1 position At that time turn the hand wheel by hand and fix this screw so that the feed foot does not come in contact with the presser foot Fix the hook shaft base covers 4 pcs by means of the hook shaft base cover setscrews 8 positions 6 Replacement of the consumable parts Standard Adjustment 1 Hook replacement o PLC 1710 1760 1760L 1 needle 2 needle Throat plate Throat plate Hook shaft base cover O SNI 6 N o
37. to 10 2 Replaceable gauge part lists 3 Stitch Skipping 3 1 Defective needle 1 A The needle is installed facing in the wrong direction Reset the needle 1 B Bent needle Replace the needle with a new one 1 C Tip of the needle is blunt Replace the needle with a new one 1 D The needle is too thick or too thin for the thread used Replace the needle with a new one 3 2 Defective hook components 2 A Blade point of the hook is blunt or worn out 3 3 The needle thread tension is too high Correct the blade point of the hook or replace the hook with a new one 2 B Incorrect hook timing Re adjust the hook timing 2 C Height of the needle bar is not correct Re adjust the vertical position of the needle bar in the light of the blade point of the hook 2 D Clearance between the blade point of the hook and the needle is not correct Minimize the clearance 2 E Effective amount of the needle guard is wrong Adjust the effective amount of the needle guard 2 F Thread loops are not made with consistency Wind the thread around the needle To the next page Decrease the needle tension Cause 1 Cause 2 Check Procedure and
38. top feed cam setscrew is faced almost to the front For PLC 1710 7 and 1760 7 Adjust the graduations of the feed adjusting dial to 6 Loosen the window plate setscrews 4 positions and remove the window plate with cylinder and the window plate gasket At that time the removal work becomes easy if the graduations of the alter nate vertical dial are set at maximum Adjust the graduations of the alternate vertical dial to 3 Loosen the top feed cam setscrews 2 positions When the needle and the feed foot is lowered under the unified condition of the alternate momentum amount move and adjust the top feed cam so that a timing can be secured to gather the three points of the feed foot the top end of the needle hole and the top face of the throat plate In this state tighten the top feed cam setscrews 2 positions For more details refer to 3 10 2 Alternate momentum amount Install the window plate with cylinder and the window plate gasket with the window plate setscrews 4 positions Guideline When the thread take up lever is positioned at the lower dead 6 point the first screw of the top feed cam setscrews is faced almost to the front For PLC 1760L Adjust the graduations of the feed adjusting dial to 6 Loosen the window plate setscrews 4 positions and remove the window plate and the window plate gasket Adjust the graduations of the alternate ve
39. 4 10783256 40038852 40038776 40038842 10783355 40038850 40039271 40038774 40038840 10783454 40038848 40038772 Needle gauge PLC 1760 PLC 1760 7 O PLC 1760L Presser foot Feed dog with guide Circular hole Location Appearance 2 4 92 4 40038800 40038810 40039009 40038783 40038797 40038808 40039008 40038782 40038795 40038806 40039007 40038781 40038897 40038792 40038802 40039006 40038780 Needle gauge Only 10mm of needle gauge is available for PLC 1760L 9 1 11 Wiring in machine head only for machines with thread trimmer 1 Connector from machine head e 12 pin connector e 16 pin connector Function BT SW NU SW DL SW Function Thread trimming Tension release DL Limit1 DL Limit 2 amp Speed Limit GND Thread trimming 1 2 3 4 5 6 7 8 Tension release 2 3 4 5 6 7 8 9 Ground e Integrated synchronizer Function 5V UDET DDET GND 2 Connector from pneumatic air e 14 pin connector Blue e 10 pin connector Function Function DL AK BT Condensation DL AK COIN Oa RI oO rm O S WDINIO As BRIO
40. Corrective Measures Continued from the previous page 3 4 Sewing speed is too high Decrease the sewing speed 3 5 Height of the needle bar is not correct 5 A Height of the needle bar is not adjusted Re adjust the height of the needle bar to the specified dimension 3 6 Defective upper feeding foot 6 A The needle hole of the upper feeding Reset the upper feeding foot foot and needle are in contact 3 7 Improper feed timing Re adjust the feed timing 3 8 Thread take up spring has been improperly 8 A Stroke of the thread take up spring is Decrease the tension of the spring adjusted too high 8 B The thread take up spring is too tense _ Decrease the tension of the spring 3 9 Incorrect needle entry 9 A The needle comes in contact with the Adjust the needle entry needle hole in the throat plate 3 10 Improper pressure of the presser foot 10 A Pressure of the presser foot is too low Increase the pressure of the presser foot 10 B The work clamp foot is floating Re adjust the lifting amount of the work clamp
41. ILIKE Post bed Unison feed Lockstitch Machine PLC 1700 Series PLC 1710 1710 7 1760 1760 7 1760L ENGINEER S MANUAL 40040656 No E372 00 Introduction This Engineer s Manual is for technical service engineers In the Adjusting instruction manual for the maintenance engineers of sewing machine and sewing workers in a sewing factory how to operate a sewing machine is also described in detail However in this manual Adjustment Procedure Results of Value change for Adjustment and the roles of each component are described these are not included in the Adjusting instructions manual When maintenance is performed for our sewing machines refer not only to this manual but also to the Adjusting instructions illustrated parts list In regard to the thread trimming machine motor please refer to the Instruction Manual for the SC 510 motor and the Service Manual separately furnished In regard to the control panel also please refer to the Instruction Manual for the control panel This Engineer s Manual describes the basic adjusting values as the reference values in the first page and the observed events caused by sewing and mechanical faults as the Results of Value Change for Adjustment and Adjustment Procedure in the second page CONTENTS Tee SSPCCMICAUONS ciscsceceissscncecatsccecessstendenacd beutatacten decics a Era radai a howcetecboadenadsbeedaiaatendete 1 2 Model Numbering system cscs ccsce te ctceccce
42. KTITE 243 Presser auto lifting lever shaft 2 21356704 LOCKTITE 243 Hinge screw attaching to cylinder connecting screw AK 2 D0720331SP LOCKTITE 243 Hinge screw attaching to cylinder connecting screw BT 2 SD0800352SP LOCKTITE 243 OO CPN o of A N Hinge screw attaching to cylinder connecting screw DL 2 SD0600403TP LOCKTITE 243 Tension release bar 3 21441209 LOCKTITE 243 a a o Hinge screw securing thread trimming roller arm 3 1 PLC 1710 and PLC 1760 excluded 2 Optional parts included 3 Only sewing machines with thread trimmer No 1 No 2 Feed adjustment rod SD0640325SP LOCKTITE application LOCKTITE 243 Alternate vertical adjusting arm pin Alternate vertical amount adjusting arm oO LOCKTITE application Hinge screw securing feed adjustment rod No 3 No 4 Bushing for alternate dial shaft SK _LOCKTITE application Top cover B 88 Setscrew J IN LOCKTITE application Shaft supporting the alternate ver tical amount change assembly No 5 No 6 N Feeding lever shaft CI LOCKTITE application SJ a LOCKTITE application N K Feeding lever Presser auto lifting lever shaft No 7 No 8 Cylinder connecting screw Cylinder connecting screw LOCKTITE application LOCKTITE application Hinge Screw attaching to H
43. LC 1710 7 1760 7 Loosen the cylinder nut and adjust the screw in value of the cylin der connecting screw by turning the shaft section of the cylinder so that the distance can be adjusted to 16 0 5mm between the top face of the throat plate and the bottom face of the presser foot O Turned in the direction Increase in the lifting amount of the presser foot O Decrease in the lifting amount of the presser foot O After adjustments tighten the cylinder nut Turned in the direction Caution After adjustments confirm that a clearance of 0 5 1 5mm is secured between the auto presser lifter lever A and the thread tension releasing support plate when the presser foot is lowered _21 When the amount of presser rise is too much o The presser foot is kept clear of the top face of the throat plate even when the presser lifter lever is returned to its origi nal position When the amount of presser rise is too less o Since the rise of the presser is insufficient the workability can become worse When the amount of presser rise is too much o When the presser is lifted the tip of the needle bar may interfere with the feed foot and the feed foot may be broken When the amount of presser rise is too less o Since the rise of the presser is insufficient the workability can become worse When the amount of presser rise is too much o When the presser is lif
44. Mm a4 oO Condensation _ 92 3 Connector from relay cable e Connector CN50 1 to 4 Function CN50 2 CN50 3 CN50 4 24V 24V 24V DL Condensation Sianal indicating sewing machine is in operation 2P Short tail GND GND Connector CN51 1 to 4 Function CN51 2 CN51 3 CN51 4 12V 12V 12V DL SW Sewing machine stop signal DL Limit 1 2P SW Thread rack switch DL Limit 2 amp Speed Limit GND GND GND e 4 pin connector Blue Function Thread trimming BT SW Tension release o INIIAI RI oO rm Thread trimming o oO Ground a _ N as o _ A Tension release 93 12 Troubles in sewing and corrective measures 1 Related to sewing Cause 1 Cause 2 Check Procedure and Corrective Measures 1 Loose stitches Isolated idling loops 1 1 Needle thread tension is too low Increase the needle thread tension 1 2 Thread take up spring tension has been improperly adjusted 2 A Stroke of the thread take up spring is too small Increase the stroke of the thread take up spring sufficiently 2 B Thread take up spring tension is insuff iciently tensioned Increase the needle th
45. Tighten the counter knife installing base setscrews 1710 7 2 po sitions 1760 7 4 positions Tighten the rocking arm R tightening screw and the rocking arm L tightening screw In this case refer to 3 18 8 9 Adjusting the position of the mov ing knife Right Left Caution The knife pressure should be kept as low as possible Let the sewing machine fall down Loosen the rocking arm R tightening screw and the rocking arm L tightening screw 1710 7 only Raise the sewing machine Move the moving knife by hand in the direction of the arrow until the clamp spring can be seen Loosen the clamp spring setscrews 1710 7 2 positions 1760 7 4 positions Adjust the position of the clamp spring so that a clearance of 1 5 0 1mm can be secured between the counter knife and the clamp spring At that time adjustments should be carried out so that a clearance of 0 2 to 0 3mm can be secured between the bottom face of the moving knife and the top face of the clamp spring Tighten the clamp spring setscrews 1710 7 2 positions 1760 7 4 positions Tighten the rocking arm R tightening screw and the rocking arm L tightening screw 1710 7 only In this case refer to 3 18 8 9 Adjusting the position of the mov ing knife Right Left _AT When the knife pressure is too much o An excessively high burden is generated around the blade sec tions
46. achine Caution 1 During adjustments confirm that the initial position of the moving knife has already been adjusted 2 In regard to the adjustment of the moving knife L for the PLC 1760 7 refer to 3 18 9 Adjusting the position of the moving knife L 53 When the clearance is too much o The operational range of the thread trimmer solenoid is narrowed and this can be a cause of machine lock When no clearance is secured o The plunger stopper may be broken o If any positional adjustment has been made inadequately thread trimmer malfunction will occur Standard Adjustment 9 Adjusting the position of the moving knife Left PLC 1760 7 only E E 9 Te o 2 9 Worker side Adjustment Procedures Results of Improper Adjustment Caution Prior to adjustments refer to 3 18 8 Adjusting the position of the moving knife R and confirm that the position of the moving knife R has been adjusted correctly Let the sewing machine fall down Loosen the rocking arm left tightening screw 1 position Loosen the setscrewa 2 positions of the thread trimmer driving joint plate Raise the sewing machine Move the moving knife by hand and adjust it to the position where the tip of the moving knife is withdrawn by 0 3 to 0 5mm from the blade tip of the counter knife O Let the sewing machine fall down Adjust th
47. adjusting dial to 0 Loosen the window plate setscrews 5 positions located behind the sewing machine Remove the window plate and the window plate gasket Loosen the hexagon head bolt to adjust the feed adjuster so that the top face of the reverse feed lever is positioned approxi mately in parallel to the junction face between the arm and the post After adjustments tighten this bolt Install the window plate and the window plate gasket with the window plate setscrews 5 positions Caution Confirm that the reverse feed lever does not interfere with the arm or the post when the graduations of the feed adjuster dial are set at 9 For PLC 1710 7 1760 7 1760L Adjust the graduations of the feed adjusting dial to maximum value Loosen the window plate setscrews 4 positions located behind the sewing machine Remove the window plate and the window plate gasket Loosen the window plate setscrews 5 positions located behind the sewing machine Remove the window plate and the window plate gasket Loosen the hexagon head bolt to adjust the feed adjuster so that a clearance of 1 0 5mm can be secured between the reverse feed lever and the reverse feed lever stopper After adjust ments tighten this bolt Install the window plate and the window plate gasket with the window plate setscrews 5 positions Install the window plate and the window plate gasket with the windo
48. al Method of Functional Setup 1 Pressing the button that is located on the motor panel turn the power supply ON 2 Press and adjust the Setup No to 24 3 Press the or button and make setting at 2 or 3 e In the case of Setting 2 the DL is turned ON with the switch turned ON and the DL is turned OFF with the switch turned OFF e In the case of Setting 3 the DL is turned ON with the switch turned ON and the DL is turned OFF with the switch turned OFF and again turned ON 4 Press the button once in order to preserve the setting data 5 Turn the power supply OFF 6 Turn the power supply ON and press the knee switch Assy to check the operation DL device Additional parts list List K No Part No Names of part 40025036 Knee switch Assy SK3514000SC Wood screw IS 4 List of optional parts AK kit AK 136 Kit Item No 40040414 Contents List A B Z 0 Part No Names of part O z PA400150100 Auto presser lifting cylinder SM6082002SP Setscrew 21356506 Cylinder connecting screw NM6080001SE Nut SD0720331SP Hinge screw 21388509 Auto presser lifting lever A 21356803 Auto presser lifting lever B O NID On BY Go N SM6051002TP Hexagon socket head cap screw 21356704 Auto presser lifting lever shaft PJ304065102 Elbow 21356308 Cylinder stay front
49. arm in the direction of the arrow and let it contact with the thread trimmer cam roller the thread trimmer driving plate and the vertical fitting basis Tighten the connecting plate setscrews of the thread trimming driv ing joint plate Raise the sewing machine 51 When the timing for thread trimming is too slow o Operation of thread trimming is not finished even at the upper stop position This can be a cause of thread trimming deficiency When the timing for thread trimming is too fast o It can be a cause of thread trimming deficiency The remaining length of the needle thread becomes short In this case the needle thread may come off the needle after thread trimming or at the beginning of sewing This can be a cause of stitch skipping at the beginning of sew ing Standard Adjustment 7 Thread trimming solenoid Contact 8 Adjusting the position of the moving knife Right PLC 1710 7 1760 7 52 Adjustment Procedures Results of Improper Adjustment Thread trimming solenoid Let the sewing machine fall down Loosen the solenoid fitting plate setscrews 2 positions Loosen the solenoid connecting arm setscrews 2 positions Tighten the solenoid fitting plate setscrews 2 positions in the position where the solenoid shaft can move smoothly while the solenoid shaft is moved in the direction of A or B Push the threa
50. ase where the feed dog does not move even when the reverse feed lever is moved vertically Tighten the horizontal feed eccentric cam setscrews 2 positions filmly Install the top cover with the top cover setscrews 2 positions Guideline In the position where the center of the needle coincides with the hook blade tip the first screw of the horizontal feed eccentric cam is faced almost above Caution 1 The torque is increased if the horizontal feed rod comes in contact with the end faces of the horizontal feed cam cover and the horizontal feed eccentric cam To avoid this the horizontal feed rod should be positioned almost in the center of the end face of the horizontal feed cam cover Q and the flange end face of the horizontal feed eccentric cam After the completion of horizontal feed timing adjust ments the top feed timing should also be adjusted again For more details refer to 11 2 Top feed cam phase o Thread tension changes o Forward and reverse stitch tight For PLC 1760L o High and low speed pitch errors Adjust the graduations of the feed adjusting dial to 12 become worse 2 Loosen the top cover setscrews 6 positions of the top of the o Thread tension changes sewing machine and remove the top cover Loosen the horizontal feed triangle cam setscrews 2 positions Turn the hand wheel by hand to lift the needle from its lowest point and stop it where th
51. at time the elbow with the same number shall be connected to the joint Automatic reverse feed device Additional parts list List B Part No Names of part Q ty 40038906 Air device P Assy 1 SK3415001SE Wood screw 4 1 2 40038722 Filter regulator Assy SK3482501SE Wood screw Check the function of the auto presser lifting device 1 Turn the motor power supply ON 2 Connect the air supply pipe to the air joint 3 Actuate the auto presser lifting device to lift the presser foot and confirm whether a clearance of 16 0 5mm is secured between the bottom face of the presser foot and the top face of the throat plate For more details refer to 3 8 2 using a knee lifter 4 If any adjustment is required loosen the nut and the cylinder shaft o Turned in the direction Increase in the lifting amount of the presser foot o Turned in the direction decrease in the lifting amount of the presser foot 5 After adjustments tighten the nut When the presser foot is lowered confirm whether a clearance of 0 5 to 1 5mm is secured between the auto presser lifting lever A and the thread tension releasing plate For more details refer to 3 8 3 Automatic presser lifting 61 2 Automatic reverse feed device l mi 2 Removing the reverse feed lever PLC 1710 1760 1 Removing the window plate
52. crews 2 positions to make adjustments of the knife pressure For more details refer to 3 18 2 Adjusting the position of the counter knife and knife pressure Fix the clamp spring with the clamp spring setscrews 2 positions For more details refer to 3 18 3 Adjusting the clamp spring Lay down the sewing machine body and fix the rrocking arm right tightening screw or the rocking arm left tightening screw 1 position In this case refer to 3 18 8 9 Adjusting the position of the moving knife Right Left Raise the sewing machine Replacing the clamp spring PLC 1710 7 1760 7 In the state of 5 above 3 Replacement the counter knife remove the clamp spring that has been used Replace the new clamp spring and fix the clamp spring setscrews 2 positions For more details refer to 3 18 3 Adjusting the clamp spring Lay down the sewing machine body and fix the rocking arm right tightening screw or the rocking arm left tightening screw In this case refer to 3 18 8 9 Adjusting the position of the moving knife Right Left Raise the sewing machine 85 7 Marking points on flywheel PLC 1710 7 1760 7 1 Marking points on flywheel UP stop position at reverse revolution to lift needle Colorless Range of UP stop positions Down stop position Marker dot Rotation angle of main shaft engraved Whit
53. d in the hole of Section A Loosen the mounting screws 2 positions of the alternate vertical amount detector switch and then tighten these alternate vertical amount detector switch mounting screws 2 position after the dis tance has been adjusted to 8 0 1mm between the bush inner diam eter and the end face of the switch main body Let the graduations 1 of the alternate vertical dial coincide with the embossed section of the top cover and mount this alternate vertical dial after inserting the set of pin and spring has been inserted in the hole of Section A Since then tighten the alternate vertical dial set screw Caution 1 If the position of the alternate vertical amount detector switch has been changed confirm whether the cor rect relationship is secured between the alternate ver tical dial and the number of revolutions 2 The PLC 1760L is provided with the alternate vertical dial However no alternate vertical amount detector switch is mounted 57 4 Mounting the optional parts 1 Auto presser lifting 1 Assembling the automatic presser lifting device Caution Confirm that the motor power supply is turned off Loosen the side cover setscrew 1 position and remove the side cover Install the elbow on the Auto presser lifting cylinder Stick the wire marks and to the elbow Elbow 2 is positioned on the face side and Elbow 3 on the hand wheel side Mount
54. d sale of the household commodities including the This manual uses environment friendly soyink healthcare products ILIKE JUKI CORPORATION MARKETING amp SALES H Q 8 2 1 KOKURYO CHO CHOFU SHI TOKYO 182 8655 JAPAN PHONE 81 3 3480 2357 2358 FAX 81 3 3430 4909 4914 Please do not hesitate to contact our distributors or agents in your area for further information when necessary The description covered in this engineer s manual is subject to change for improvement of the Copyright 2005 JUKI CORPORATION commodity without notice All rights reserved throughout the world 06 03 Printed in Japan E
55. d trimmer roller arm in the direction of C and let it contact with the cam roller the thread trimmer driving plate and the vertical fitting basis While the state of 5 above is kept as it is move the solenoid shaft in the direction of Aor B so that a clearance of 0 05 to 0 15mm can be secured between the end face of the thread trimmer solenoid and the plunger stopper Since then tighten the solenoid connecting arm setscrews 2 positions Confirmation 1 Manually actuate the thread trimmer and confirm that 5 a clearance of 0 05 to 0 15mm has been secured be tween the plunger stopper of the thread trimmer solenoid and the thread trimmer solenoid when the moving knife returns to its initial position For initial positions of the moving knife refer to 3 18 8 9 Adjusting the position of the moving knife Right Left Adjusting the position of the moving knife Right PLC 1710 7 1760 7 Let the sewing machine fall down Loosen the rocking arm R tightening screw and the rocking arm L tightening screw 1710 7 only Adjust the moving knife to its initial position where the blade tip of the counter knife is protruded by 0 3 to 0 5mm from the tip of the moving knife Fig A Push the rocking arm R in the direction of the arrow and tighten the tightening screw 1 position while the thread trimmer stopper keeps contact with the rocking arm R Raise the sewing m
56. djustments for this item confirm whether the feed dog height has been correctly ad justed For more details refer to 3 4 Height of the feed dog 333 12 Needle motion Standard Adjustment 20 0 5mm 13 Normal and reverse stitch length Standard Adjustment Adjustment Procedures Results of Improper Adjustment 4 5 Let the sewing machine fall down Loosen the horizontal feed rear arm hinge screw nut Move the horizontal feed connecting rod until the distance from the shaft center of the horizontal feed shaft to the hinge screw center becomes 20 0 5mm After the horizontal feeding tighten the rear arm hinge screw nut Turn the hand wheel and check the needle motion Raise the sewing machine Guideline 1 The engraved marker line of the horizontal feed rear arm coincides with the center of the hinge screw 2 If the distance is increased more than the standard adjust ing value 20 0 5mm the amount of bottom feed is re duced Adjustment Procedures o This can be the cause of needle breakage or stitch skipping Results of Improper Adjustment Loosen the top cover setscrews 6 positions and remove the top cover Adjust the graduations of the feed adjusting dial to 6 For the PLC 1760L adjust it to 12 Loosen the feed adjusting eccentric pin setscrews 2 positions Turn the feed adjusting eccentric
57. e solenoid valve P Assy For the one touch joint mounted as per 2 above and the straight joint of the reverse feed cylinder connect them through the air hose Assy for BT Check the function of the automatic reverse feed device 1 Connect the pipe of the air supply source and turn the motor power supply ON 2 Press the leftmost switch of the 5 gang switch and confirm that the automatic reverse feed device is actuated Automatic reverse feed device Additional parts list List F No Part No Names of part Q ty Remarks 40040419 Solenoid valve P Assy HK034610100 Connector CN20 connector 40024864 Relay cord 40040671 Air hose Assy for BT _67 3 DL device PLC 1760L only 1 Installing the DL device 68 Caution 1 The DL device can be mounted only on the PLC 1760L where the auto presser lifting device and the automatic reverse feed device are installed 2 Prior to the work confirm that the motor power supply has been turned OFF 3 This work should be carried out in the state that the air pressure in the regulator is zero Loosen the window plate E setscrews 4 positions located behind the sewing machine Remove the window plate E and the window plate gasket E Remember that the window plate gasket E and the window plate E setscrew wi
58. e 65 to 75 Red 181 yellow 235 Colorless 18 Upper dead point of needle bar 0 degree Adjustment of thread trimming cam position Yellow Red 2 Thread trimming timing chart Thread trimming solenoid Tension release solenoid Condensation 210 276 0 60 Rotation angle of main shaft Upper dead point of needle bar 0 86 8 Lubrication diagram Arm section PLC 1710 PLC 1760 Base of right hook shaft Base of left hook shaft SQ 9 LOCKTITE applied portion LOCKTITE was applied the following portions in the assembly line at the factory and minimize the possibility of disassembly In case of disassembly by necessity apply LOCKTITE at reassembly Be sure to clean the surface well with thinner or the like and dry the surface before LOCKTITE application If the LOCKTITE applied portion cannot be released use a blowtorch or the like to increase the possibility of release Z e Applied portion Part No LOCKTITE No Hinge screw securing feed adjustment rod SD0800402TP LOCKTITE 638 Alternate vertical adjusting arm pin 1 10715308 LOCKTITE 638 Bushing for alternate dial shaft 1 10715100 LOCKTITE 638 Screw securing the shaft that supports the alternate vertical amount change assembly 1 S8150710SP LOCKTITE 243 Hinge screw securing feeding lever square block 23009509 LOC
59. e center of the needle coincides with the hook blade tip Turn and adjust the horizontal feed triangle cam to the phase where the feed dog does not move even when the reverse feed lever is moved vertically Tighten the horizontal feed triangle cam setscrews 2 positions filmly Install the top cover with the top cover setscrews 2 positions Guideline In the position where the needle bar is lifted by 4mm above its lowest point the first screw of the horizontal feed triangle cam is faced almost above Caution 1 The torque is increased if the horizontal feed rod comes in contact with the end face of the horizontal feed triangle cam To avoid this the horizontal feed rod should be set up so that a clearance of 2 3mm is secured between the horizontal feed rod and the flange end face of the horizontal feed triangle cam After the completion of horizontal feed timing adjust ments the top feed timing should also be adjusted again For more details refer to 11 2 Top feed cam phase o Forward and reverse stitch tight ness changes 29 Standard Adjustment 2 Top feed cam phase PLC 1710 1760 PLC 1710 1760 PLC 1710 7 1760 7 1760L 00 PLC 1710 1760 1760L
60. e center to center distance Lmm between the right and left thread trimmer driving jpint plate so that the gradient A of the rocking arm R when it is pushed in the direction of Y becomes identical with that B of the rocking arm L When this condition is assumed tighten the setscrews 2 positions of the thread trim mer driving joint plate Tighten the rocking arm L tightening screw 1 position while the rocking arm R is pushed in the direction of Y Turn the hand wheel by hand to move the moving knife to its front most position while the rocking arm R is pushed in the direction of X 10 Confirm that the distance has attained 4 5 to 5 5mm between the tip of the moving knife and the end face of the throat plate If this distance has not attained 4 5 to 5 5mm make adjustments in the procedures specified below o When the distance is greater than 4 5 to 5 5mm 1 Loosen the rocking arm left tightening screw 1 position 2 Loosen the setscrews 2 positions of the thread trimmer driv ing joint plate 3 Shorten the center to center distance Lmm between two thread trimmer driving joint plates 4 Refer to 5 5 Refer to 9 6 Refer to 10 o When the distance is shorter than 4 5 to 5 5mm 1 Loosen the rocking arm left tightening screw 1 position 2 Loosen the connecting plate setscrews 2 positions of the thread trimmer driving joint plate 3 Lengthen the center to center distance
61. e contact between the end face of the thread trimmer cam and the cam roller and temporarily tighten the thread trimmer cam setscrews 2 positions These setscrews are temporarily tightened because timing adjust ments are needed for the thread trimmer cam afterwards Loosen the safety device disc setscrews 2 positions Let the safety device disc keep a close contact with the thread trimmer cam and firmly tighten the safety device disc setscrews 2 po sitions In the state that the thread trimmer roller arm is pressed in the direction of the arrow and that the vertical fitting basis the thread trimmer driving plate and the cam roller are keeping contact with each other tighten the thread trimmer driving joint plate setscrews 2 positions In this case refer to 3 18 6 Connection of the rocking arm and the thread trimmer roller arm AQ When no clearance is secured be tween the cam roller and the driv ing plate o The thread trimmer cam in terferes with the cam roller and this can be a cause of break age or machine lock When a large clearance is secured between the cam roller and the driv ing plate o The cam roller enters the thread trimmer cam during machine operation and this can be a cause of machine lock Standard Adjustment 5 Timing adjustment for the thread trimming cam S Close contact
62. e throat plate and the inner hook clamp section 4 E Inadequate adjustment of hook needle guide Adjust the needle to hook relation 4 F Thread path of the hook has scratches Adjust the effective amount of the needle guard 4 5 Defective inner hook guid 5 A The clearance between the inner hook and inner hook guide is too much Smoothen the thread path 4 6 Thread take up spring has been improperly adjusted Adjustment amount of the stroke Decrease the clearance Adjustment amount of the tension Re adjust the stroke of the thread take up spring 4 7 Sewing speed is too high The needle generates heat resulting in thread breakage Re adjust the spring tension 4 8 The installing point of the needle is too low Height of the needle bar is insufficient Decrease the sewing speed Wind the thread around the needle Needle is not attached in the needle bar in the correct manner Re adjust the height of the needle bar 4 9 Pressure of the presser foot is too low Stitches gather on the overlapped section of a material resulting in thread breakage Attach the needle in the needle bar 4 10 Incorrect needle entry
63. e vertical link spacer At that time Lock Tight 243 shall be applied after the degreasing of the threaded section of the alternate vertical link hinge screw Mount the alternate vertical link spacer on which the alternate vertical link has been mounted as per 10 above on the newly mounted stopper plate B by means of the setscrews 2 positions In the reverse procedures for the disassembly work described in 8 on the previous page mount the alter nate vertical amount changer on the sewing machine When the alternate vertical link pins 2 positions are fixed with the setscrews 2 positions note that these setscrews are arranged to come in contact with the flat section of the alternate vertical link pins In addition it must be noted that the oblong hole section of the alternate vertical link is made to face the direction of the window plate mounting face Insert the alternate vertical amount changer shaft in the alternate vertical amount changer so that its flat section is made to face upwards and then fix it with the setscrews 2 positions either one keeping in touch with the flat section At that time make sure not to protrude the alternate vertical amount changer shaft from Face B of the alternate vertical amount changer Insert the support shaft in the alternate vertical amount changer and remove a backlash by pressing the alternate vertical amount changer lightly against the metal
64. eccescestescvereters 20 2 Using a knee lifter PLC 1710 1760 17G6OL ccccessseeeeeeeeeeeeesneeeeeeeseeeeeeeeeeeeeeneneeenes 20 3 Auto presser lifter PLC 1710 7 1760 7 cccccseeeeeeeeeeeeeeeeeeeeeeeeeeenseneeeeneeeeseeeeeseeeenaees 20 9 Timing BOM SOUP seis i ecsaccckccccanasecwocnenainasnsctesasadacededeechonates uncedenasanaviiadecshdeaskauaubeceesadniadedwensanas 22 10 FOO MOUOM fcscccicccvcceivccsceciccerestecoicceeeteeeceateeescocesiedesdstuctacs cavansssivseriesessatedeieetaceetesesdesaedateesnss 24 1 Alternate Vertical amount sisiicccccscecccsccscciececcecescccecctceccsctcecssceccncsccecescrencsseesecersectecess 24 2 Alternate MOMENTUM AMOUNT cccecceeceeeceeeceeeenee ene snes nese seeesnenseeeseeeseeeseeeseeeneeeneeeneeenes 26 11 Feed aM PNASC rice cercciiscceccescecieceecectsencscaeceecessececeveetess teetesusteansieiuvestnseaseisucateccesveevaederessunaestis 28 1 Horizontal feed cam phase esi ciscisiniecc sists mcadesaicshawdad de cecdsbsalweds Oeendananaadsccaneentinaaaaaiendandeds 28 2 TOP 166d c m PHASE sieve sicssdrtesesetensccdctarteisetscadenandaad aici aecchaneawedsend carendiolucisismaaenensiana 30 3 Vertical feed cam phase siiiicscsiceddeascitdanisbngececleaindse Gncanstecinaainetccndacdahaneakapes nnmnnn nnan 32 12 Needle MOTON a A ra a aa a aE aa a aa ra aE cescasecvaveleseccsdcunciebedteteesstvasetvesssehasiens 34 13 Normal and reverse stitch length nnnnnnnnnnnnnnnnnnnnnnnnnnn
65. edle bar Return the needle bar rocking fulcrum shaft that has been drawn out as per 18 above Tighten the needle bar rocking fulcrum shaft setscrew 1 position At that time this setscrew shall be tightened until it comes in contact with the flat face of the shaft After screw tightening confirm that there is no thrust backlash in the needle bar rocking base After the needle has been mounted loosen the needle bar connecting bracket tightening screws 2 positions to a degree so that the needle bar can move lightly Turn the needle clamp by hand so that the right and left needles are positioned in parallel to the lower shaft and temporarily tighten the needle bar connecting screws 2 positions Loosen the feed lever base setscrews 4 positions and the feed base arm tightening screws to adjust the position of the feed needle hole in relation to the needle center For more details refer to 3 2 Adjustment of the feed dog position Mount the left hook shaft base setscrews 2 positions that have been removed and adjust the timing for the needle and the hook For more details refer to 3 5 Timing between the needle and the hook Except for PLC 1760L Mount the replacing throat plate base by means of the throat plate holder setscrews 10 positions Mount the replacing throat plate by means of the throat plate setscrews 2 positions At that time adjust the vertical clearance between the
66. eeseseeseeeeeeeeeeeeeeeeseees 84 4 Replacing the clamp spring PLC 1710 7 1760 7 cccccssseecesseeeeeeeeeeeeeeeseeeeeeeeeeeeeeeneeenees 84 7 Marking points on flywheel PLC 1710 7 1760 7 ccccceeeeeeeeeeeeeeeeeeeeeeeees 86 1 Marking points on flywheel ceceeeeeeceeeeeeeeeeeeeneeeeeeeeeseeeneeeseeesaeesaeesaeesaeeseeeseeeseeeaeeeeeees 86 2 Thread trimming timing chart ccseceseceeeceeesceeseneseeeseneseeesaeeaeeesaeeeaeesaeesaeesaeseeeeneesaeees 86 8 Lubrication diagram i 22556 c cscs ace eee Geen ea ee eee 87 9 LOCK TITE applied portion nan iocc ee scc cece cece ceectene ee ccecceacdecen ne caeerecteceeteeeteencenteecut 88 10 Consumable part list replaceable gauge part liSt cceeceeeeeeeeeeeeeeeeeees 90 1 Consumable part StS mannaaa inanan daanan andaan naana Aaaa AAA Kain Anaa Naana aAA tiaan iaia 90 2 Replaceable gauge part lists sccssecseeceesceeccneseneseeeseeesnneseneseeeseeeseeesaeeneeesaeeseeeseeeneeeeeees 90 11 Wiring in machine head only for machines with thread trimmer 92 1 Connector from Machine head cccccccseseseeeeeeeeeeeneeseeneeeeeeeeeeseseeeeneeeseseeseeeeseeneeseeeesensenees 92 2 Connector from pneumatic air sitar eccieeisincsetictetitt nas Seek eeneandcteacetntarteeieetetiel nasi 92 3 Connector from relay Cable cisictitcos ecatiesciicss de citlcaneateei i avi nace eee aie 93 12 Troubles in sewing a
67. es with the hook blade tip o Uneven stitching will be caused Turn the vertical feed cam by hand to the position where the amount of protrusion of the feed dog becomes maximum from the top face of the throat plate Tighten the vertical feed cam setscrews 2 positions and fix the vertical feed cam 7 Raise the sewing machine Caution 1 Secure a clearance of 0 3 to 0 5mm between the end face of the vertical feed link and the flange end face of the vertical feed cam 2 Prior to making adjustments for this item confirm whether the feed dog height has been correctly ad justed For more details refer to 3 4 Height of the feed dog For PLC 1710 7 and 1760 7 Adjust the graduations of the feed adjusting dial to 0 Let the sewing machine fall down Loosen the vertical feed cam setscrews 2 positions Turn the hand wheel and adjust it to the position where the top end of the needle hole coincides with the top face of the throat plate while the needle is lowering Turn the vertical feed cam by hand to the position where the top face of the throat plate of the throat plate coincides with the high est part of the feed dog Tighten the vertical feed cam setscrews 2 positions and fix the vertical feed cam 7 Raise the sewing machine Caution 1 Secure a clearance of 2 to 2 5mm between the end face of the vertical feed slide block and the flange end face of the vertical feed cam 2 Prior to making a
68. etween the presser bar and the upper feed bar to Dimension A at the level 47mm above the upper surface of the throat plate Since then tighten the rear needle bar rocking arm tightening setscrew firmly Return the window plates and the window plate gaskets to their former positions which have been removed as per 3 and 4 above Then tighten the setscrews 4 positions and 5 posi tions respectively Caution After the rear needle bar rocking arm setscrew has been tightened confirm that there is no thrust back lash around the needle bar rocking shaft o Stitch skipping or needle breakage will be caused o Poorly tense stitches will be caused 2 Adjustment of the feed dog position Standard Adjustment PLC 1710 PLC 1760 PLC 1710 7 PLC 1760 7 PLC 1760L 1 needle 2 needle zal a CX cm y a Hmm 4 i SaN O TA PLC 1710 ETE peed PLC 1760 7 PLC 1760L Adjustment Procedures Results of Improper Adjustment Adjust the graduations of the feed adjusting dial to 0 Let the sewing machine fall down Loosen the vertical feed cam setscrews 2 positions Loosen the feed bracket arm tightening setscrews 2 positions Raise the sewing machine Loosen the throat plate setscrews 2 positions and remove the throat plate Loosen the throat plate holder setscrews 1 needle 6 positions 2 needle 10 positions and remove the throat
69. foot 4 Needle Thread Breakage 4 1 Thread path is incorrect 1 A Thread path is not smooth on the surface Make the thead path smooth Cutting Hangnail 1 B Thread path has scratches on the surface Smoothen the thread path 1 C Thread is caught in some part of the thread path Thread path modification 4 2 Improper needle thread tension Adjust the needle thread tension 2 A The tension controlled by the tension Adjust the tension controller No 1 thread tension controller No 1 is too low to prevent the thread from flapping 4 3 Defective needle 3 A The needle is installed facing the wrong Re install the needle in the correct manner direction 3 B Needle abnormality Replace the needle with a new one Deformation breakage wear 3 C The needle is too thick or too thin for the Replace the needle with a new one thread used M To the next page Cause 1 Cause 2 Check Procedure and Corrective Measures Continued from the previous page 4 4 Defective hook components 4 A Blade point of the hook is blunt or worn out 4 B Hook timing is too early Correct the blade point of the hook or replace the hook with a new one 4 C Re adjust the clearance between the the hook and throat plate is too small Adjust the hook timing 4 D The needle interferes with the blade point of the hook Re adjust the clearance between th
70. in tained at 83 to 84mm when measured from the arm end face In the sidewise direction it is positioned to coincide with the end face of the alternate vertical converter shaft Tighten the Alternate vertical adjusting arm setscrew 1 position Set the graduations of the alternate vertical dial at the lowest level Use the top cover setscrews 6 positions to mount the top cover O Turn the alternate vertical dial and confirm that the dial digits cor rectly correspond to the alternate vertical amounts 25 For certain types of sewing materials the working height may be increased o Sewing of sponge materials o Sewing of stepped sections o When the working value is in creased difference may be caused between the stitching pitches and dial graduations When the working value is in creased the feeding force may be reduced Accordingly the motor speed should be some what lowered in such a case For certain types of sewing materi als the working height may be in creased o Sewing of sponge materials o Sewing of stepped sections Standard Adjustment 2 Alternate momentum amount PLC 1710 1710 7 PLC 1760 1760 7 1760L Top surface lt Top surface of throat plate of throat plate Feed dog PLC 1710 1760 PLC 1710 7 1760 7
71. inge screw attaching to cylinder cylinder connecting screw connecting screw No 9 No 10 Tension release bar LOCKTITE application Coupling attaching to tension release bar LOCKTITE application Coupling nut attaching to tension release bar Hinge screw attaching to cylinder connecting screw No 11 Tread trimming roller arm D Connecting link or LOCKTITE application Hinge screw securing thread trimming roller arm 89 10 Consumable part list replaceable gauge part list 1 Consumable part lists o PLC 1710 1760 Consumable part Part No Remarks Needle MC321001400 Schmetz 134 35 Nm140 Hook assembly 40039010 Bobbin o PLC 1710 7 1760 7 Consumable part 10759603 Part No Remarks Aluminum bobbin with a knurling tool Needle MC321001400 Schmetz 134 35 Nm140 Hook assembly 40038731 Bobbin 10759603 Aluminum bobbin with a knurling tool Moving knife 40038746 Counter knife 40038747 Clamp spring o PLC 1760L Consumable part 40039404 Part No Remarks Needle MC321002000 Schmetz 134 35 Nm200 Hook assembly 40038870 Bobbin 10759603 2 Replaceable gauge part lists o PLC 1710 1710 PLC 1710 7 O O Aluminum bobbin with a knurling tool O PLC 1710 7 O O O
72. ition hook guide may be broken Turn the inner hook in the direction of the arrow against the regular revolving direction and press the inner hook clamp section against the throat plate Loosen the tightening screws 1 needle 1 position 2 needle 2 positions of the inner hook guide arm and adjust the clearance to Dimension A between the inner hook guide and the inner hook O After adjustments tighten the tightening screws 1 needle 1 po sition 2 needle 2 positions of the inner hook guide At that time confirm the freedom from the vertical backlash in the inner hook guide Install the hook shaft base cover with the hook shaft base cover setscrews 1 needle 2 positions 2 needle 4 positions Caution 1 For the 2 needle version the same adjustments should be made for the right and left 2 For the 2 needle version the inner hook guide arm tightening screw of the left hook is located on the opposite side of the worker 19 8 Lifting amount of presser T Standard Adjustment 1 Presser lifter lever Using a knee lifter lever A Using a knee lifter lever B 16 0 5mm 0 5 to 1 5mm 16 0 5mm 20 Adjustment Procedures Results of Improper Adjustment 1 Presser lifter lever 1 2 Loosen the side cover setscrew 1 position loca
73. ition to Dimension A Otherwise the work of 16 should be carried out once more again Bend the hook s needle guard so that the effective amount of the hook s needle guard is adjusted to 0 1 to 0 2mm at the tip of the needle Refer to Fig A Install the throat plate holder with the throat plate holder setscrews 1 needle 6 positions 2 needle 10 positions Install the throat plate with the throat plate setscrews 2 posi tions Install the hook shaft base cover with the hook shaft base cover setscrews 1 needle 4 positions 2 needle 8 positions 15 6 Timing between the needle and the hook PLC 1760L Standard Adjustment 0 1 to 0 2mm Fig A _ 16 Adjustment Procedures Results of Improper Adjustment Caution The same adjusting values should be secured for both rightand 9 Stitch skipping or thread left a i bie eas dial to 0 breakage will be caused just the graduations of the feed adjusting dial to 0 Loosen the throat plate setscrews 2 positions and remove the throat o Poorly tense stitches will be plate caused Loosen the throat plate holder setscrews 10 positions and remove the throat plate holder Loosen
74. large hook 1 2 6 7 8 9 10 11 12 13 14 15 16 17 3 4 5 PLC17108S A AALI AA 8 Type classification S Standard 9 to 14 Classification of automatic presser lifter Space Nil AK136B AK 136B with pedal switch type 16 Place pf destonation Standard 17 Accessories type Standard 2 PLC 1760 Model name Post bed 2 needle unsion feed lockstitch machine with vertical axis large hooks 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 PLC1760 19 20 21 22 23 24 25 26 LIAAATLI AA Type clasification 8 S Standard Thick thread long pitch Needle gauge classification For thick thread long pitch type L is available only the needle gauge D 10mm 10 Classification of presser S Standard A With center guide 12 to 16 Classification of units Space Nil BT DL With BT DL23 Provisions of units are not available if S Standard is se lected for the classification of specifications 18 to 23 Classification of automatic presser lifter Space Nil AK136B AK 136B with pedal switch type x The AK136B shall be selected if BT DL is selected for the classification of units 25 Place pf destonation A Standard 26 Accessories type A Standard 3 PLC 1710 7 Model name Post bed 1 needle unison feed lockstitch machine with a vertical axis large hook with automa
75. le Increase the needle size 1 9 Defective needles 9 A Installing direction of the needle is incorrect v To the next page Re install the needle 9 B Tip of the needle has burrs Replace the needle with a new one Cause 1 Cause 2 Check Procedure and Corrective Measures Continued from the previous page 1 10 Defective feed timing 10 A Feed timing is earlier than the standard one E Re adjust the feed timing 10 B Height of the feed dog differs from the standard value Re adjust the height of the feed dog 1 11 Defective hook timing 11 A Hook timing is too early Re adjust the hook timing 1 12 Defective needle entry Align the needle hole center of the needle dog with the needle center 1 13 Inner hook opening lever is defective 13 A The clearance between the inner hook and the inner hook guide is too much or eliminated Re adjust the inner hook guide 1 14 Needle thread tangle with feed dog 2 Loose stitches needle thread floating 2 1 The needle thread is pulled up completely 13 A Stroke of the thread take up spring is too short Increase the stroke Use the feeding foot with the slit Refer
76. lift the outer hook the counter knife installing base the moving knife installing base and the inner hook guide at the same time in order to take out the outer hook In the same procedures as when the outer hook is removed as per 8 above for the replacement by a new outer hook mount the counter knife installing base the moving knife installing base and the inner hook guide all together Fix the new outer hook by means of the hook setscrew 1 position At that time fix the outer hook in the state that the positioning pin of the hook shaft top face is entered in the hole of the new outer hook Mount the inner hook in the outer hook Fix the feed track clamp by means of the feed track clamp setscrews 3 positions Check the timing for the needle and the hook For more details refer to 3 5 Timing between the needle and the hook Fix the throat plate with the throat plate setscrews 2 positions Check the vertical clearance between the top face of the inner hook clamp section and the throat plate For more details refer to 3 3 Clearance between the throat plate and the inner hook clamp section Tighten the inner hook guide arm tightening setscrew 1 position At that time make sure that there is no vertical backlash around the inner hook guide For more details refer to 3 7 Adjusting the inner hook guide Fix the moving knife to the moving knife in
77. ll be used again Loosen the top cover setscrews 6 positions and remove the top cover Loosen the alternate vertical shaft spring setscrew 1 position and remove the alternate vertical shaft spring hanger Loosen the top feed stopper plate setscrews 2 positions and remove the top feed stopper plate Loosen the alternate vertical amount changer arm tightening screw 1 position Loosen the alternate vertical amount changer shaft setscrews 2 positions and move the alternate verti cal amount changer shaft toward the hand wheel Move it until it comes off the alternate vertical amount changer Loosen the support shaft setscrew 1 position and move the support shaft toward the face section Move it until it comes off the alternate vertical amount changer Loosen the setscrews 2 positions to remove the connector link Support pins 2 positions and take out the alternate vertical amount changer Loosen the stopper plate setscrew 1 position and replace it with a new stopper plate B At that time the alternate vertical shaft spring shall be removed and mounted on the new stopper plate B Continued to the next page 69 eb 2 gt xe l Q et t ke T ajam 2 mm 70 Using the alternate vertical link hinge screw mount the alternate vertical link on the alternat
78. nd Corrective measures ssssseeeeeeeeeeeeeeeeeeeeeeeeeeeeees 94 DT Related 10 SOWING fics iris ecet r cewek eke aaa a aaa a eae a aE Aaaa a a aaa eaaa aae 94 2 Thread trimming and concerns ssssssssssnnnennnnnnnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnn nnnm nnn nnmnnn nnmnnn nnmnnn nnmnnn 99 13 List of the sewing speedS cssssseeeeeeeeeeeeeeeeeeeeeneeeneseneeeeeeeeeeeeseeeeeeeseseneeeoees 102 14 Table drawing asics sess ee csc eccecedeccent cased decade ccettene sade nnnnnnnnnn ennnen nannan 103 1 Flat table scessesssescssssssssssssssesssessuescucssseesseesseesseesseesseesseesseessuessnesanesauessnessuesaessneerevesevereeereess 103 1 Specifications Application ono hem Model name Specifications for sewing PLC 1710 Post bed 1 needle unison feed lockstitch machine with a vertical axis large hook PLC 1760 Post bed 2 needle unison feed lockstitch machine with vetical axis large hooks PLC 1710 7 Post bed 1 needle unison feed lockstitch machine with a vertical axis large hook with automatic thread trimmer PLC 1760 7 Post bed 2 needle unison feed lockstitch machine with vertical axis large hooks with automatic thread trimmer PLC 1760L Post bed 2 needle unison feed lockstitch machine with vetical axis large hooks pachynema long pitch specification Application Heavy weight material Heavy weight material Thick thread specifications Max
79. ned to a degree where the needle bar can be moved vertically by hand Move the needle bar vertically by hand so that the hook blade tip comes to the height of Dimension B measured from the needle hole upper end of the needle Thighten the setscrews 2 positions of the needle bar connection Bend the hook s needle guard in the direction of the hook center so that the effective amount of the needle guard is reduced to 0 Loosen the hook shaft base setscrews 1 needle 2 positions 2 needle 4 positions Turn the hand wheel by hand and raise the needle bar from the lowest position to Dimension A In the state that there is no contact between the needle and the hook s needle guard move and adjust the hook shaft base to the right and left so that a clearance of 0 to 0 1mm can be secured between the needle and the hook blade tip After adjustments tighten the setscrews 1 needle 2 positions 2 needle 4 positions of the hook shaft base Let the sewing machine fall down again and turn the hook by hand in the state of 13 above Adjust the hook blade tip to the center of the needle and fix the hook shaft gear with the use of the hook shaft gear setscrews 1 needle 3 positions 2 needle 6 positions Raise the sewing machine Confirm that a coincidence is secured between the center of the needle and the hook blade tip when the needle bar is raised from the lowest pos
80. ng force is re duced the motor speed should be somewhat lowered For certain types of sewing materi als the vertical amount of motion of the feed foot should be increased more than that of the presser foot o Sewing of sponge materials o Sewing of stepped sections When the vertical amount of motion is extremely different o The pitches of stitches become different from the graduations of the dial o Since the feeding force is re duced the motor speed should be somewhat lowered 11 Feed cam phase Standard Adjustment 1 Horizontal feed cam phase According to the model type the shape of the top cover will change Besides PLC 1760L Besides PLC 1760L a 2 Only PLC 1760L 2 to 3mm 28 Adjustment Procedures Results of Improper Adjustment For PLC 1710 1710 7 1760 1760 7 o High and low speed pitch errors Adjust the graduations of the feed adjusting dial to 9 become worse 2 Loosen the top cover setscrews 6 positions on the top of the sewing machine and remove the top cover Loosen the horizontal feed eccentric cam setscrews 2 positions Turn the hand wheel by hand to lift the needle from its lowest point ness changes and stop it where the center of the needle coincides with the hook blade tip Turn and adjust the horizontal feed eccentric cam to the ph
81. nly eceeees 54 19 Alternate vertical dial PLC 1710 7 1760 7 cccseeeeeeeeeeeeseeeeeeeeeeeeesaeeeeeeeeeeeeseeeeeeeeeaees 56 1 Mounting position of the alternate vertical amount detector SWitCN ccceeeeeeees 56 Caution Adjustments for 18 thread trimming device should conform to the procedures 1 to 9 in this order If this adjusting order is changed the result can differ from the performed in the regular order 4 Mounting the optional parts 2 cccecceeeeeeeeeeseeeeeeeeeeeeeeeeeeeeseeneeeesseneeeeeeeeeesenees 58 1 AUTO PFESSON LNG iiessssecaitatsassteakstisdiccttiaesobiuce seesdancevieiad saseid eraeadaatddncawenwatiedanniwalenemidaredas 58 1 Assembling the automatic presser lifting device ecessseeeeneeeeeeeeeeeeeeneeeeeeeeeeennes 58 2 Assembly of the air device snssnnnunnnnnnnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn annnm 60 2 Automatic reverse feed device ssnnnnnnnnnnnnnnnnnnnnnennnnnnnnnnnnnnnnnnnn nnnm nnn nnmnnn nnmnnn nnmnnn nnmnnn nnna 62 1 Removing the window plate nnssesunnunnnnnnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nn nnnnnnnnn nnne 62 2 Removing the reverse feed lever PLC 1710 1760 c seccceeeesssseeeeeeeeeeenseneeeseneeeees 62 3 Installing the reverse feed lever PLC 1710 1760 ccssseseeeeeeeeeseseeeeeeeeeeseeeeeeeeeeneeees 62 4 Installing the automatic reverse feed device
82. nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn 34 14 Balance a A T A 36 15 Position of reverse feed lever nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnm nnnn nnnm nn nnmnnn nnana nnna 38 16 Safety mechanisme ariei innnan ene aaa ana aha MA AEEA AAAI LANAA ete 40 17 Reverse feed cylinder and condensation cylinder cccesseeeeeeeeeeeeeseeeeeeneneeseeeeeeeeeeeeeeee 42 18 Thread trimming device PLC 1710 7 1760 7 s eccccesseeeeeeeeeeeeeeeeeeeeeeneeeeeeeeeeeeeeeneeenes 44 1 Adjusting the height of the MOVING knife cceeccessseeeeneeeeeeeeeeeeeeeeeeeeeeeeenneneeeeeneneenes 44 2 Adjusting the position of the counter knife and knife pressure cccccsssseeeeseeeees 46 3 Adjusting the clamp Spring esicmececciisnececnncwaiieisuandneelsnnsedecucduenyearactauidessadeenaunecawnceueeneneinasetews 46 4 Adjust the thread trimming cam position ssssssssennnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn 48 5 Timing adjustment for the thread trimming cam cccccesseeeeeeeeeeeeeeeeeeeneeeeeeeeeeeeeeeeeeeees 50 6 Connection of the rocking arm and the thread trimmer roller arm cccccesseseeeeeeees 50 7 Thread trimming solenoid sis seadecauk stick Seaieek exantan va sebe ceanstaataaankedtaneadavas atadeemnnanuianecd vis 52 8 Adjusting the position of the moving knife Right PLC 1710 7 1760 7 00 52 9 Adjusting the position of the moving knife Left PLC 1760 7 o
83. o be entered in the stepped part may fail to be obtained of the hinge screw that is mounted on the feed adjuster rod Condensation cylinder If the distance between the Loosen the cylinder setscrews 2 positions and remove the cylin cylinder and the condense der from the window plate cylinder screw deviates from Loosen the nut the specified value there may be Adjust the distance to 6 5 to 7 5mm between the end face of the a failure in thread trimming cylinder shaft and the condense cylinder screw Tighten the nut Mount the cylinder on the window plate by means of the set screws 2 positions 43a 18 Thread trimming device PLC 1710 7 1760 7 Standard Adjustment 1 Adjusting the height of the moving knife 44 Adjustment Procedures Results of Improper Adjustment Let the sewing machine fall down Loosen the rocking arm R tightening screw and the rocking arm L tightening screw 1710 7 only Raise the sewing machine Loosen the moving knife installing base setscrews 1710 7 2 po sitions 1760 7 4 positions Move the moving knife installing base vertically so that a clear ance of 0 8 0 1mm can be secured between the inner hook and the bottom face of the moving knife Tighten the moving knife installing base setscrews 1710 7 2 po sitions 1760 7 4 positions
84. ord stopper fittings Setscrews for and 65 6 Installation of the air related devices N20 a x x 66 Using the setscrews 2 positions mount the solenoid valve Assy on the solenoid valve P Assy that is presently used In this case a cover is mounted on the solenoid valve P Assy by means of the setscrews 2 positions Therefore these setscrews 2 positions and the cover must be removed first of all Loosen the setscrews 2 positions and mount the replaced stop plug on the one touch joint Disconnect the connector CN1 from the solenoid valve P Assy Insert the cords to which are extended from the solenoid valve P Assy and the solenoid valve Assy in the connector CN20 The cord of the solenoid valve P Assy shall be passed through the tube and then inserted in the connector CN20 Solenoid valve already Cord Red CN20 7 attached Cord Black CN20 2 Solenoid valve newly Cord Red CN20 8 attached Cord Black CN20 3 Solenoid valve P Assy Solenoid valve Assy Using the relay cords make connections among SC 510 inside the front cover the 5 gang switch and th
85. plate holder Loosen the hook shaft base cover setscrews 1 needle 4 posi tions 2 needle 8 positions and remove the hook shaft base cover O Loosen the feeding lever base setscrews 4 positions Turn the hand wheel slowly so that the needle bar is adjusted to the lowest position Move the feeding lever base to the right and left so that the needle center can coincide with the needle hole center of the feed dog At that time the feed bed arm should also be moved Fix the feeding lever base with the feeding lever base setscrews 4 positions Let the sewing machine fall down Confirm that there is coincidence between the needle center and the needle hole center of the feed dog and tighten the feed bracket arm tightening setscrews 2 positions Thighten the vertical feed cam setscrews 2 positions For more details refer to 11 3 Vertical feed cam phase Raise the sewing machine Fix the throat plate holder with the throat plate holder setscrews 1 needle 6 positions 2 needle 10 positions Fix the throat plate with the throat plate setscrews 2 positions Fix the hook shaft bed cover with the hook shaft bed cover set screws 1 needle 4 positions 2 needle 8 positions o Ifthe throat plate should come in contact with the feed dog hitting sound will be generated and the throat plate and the feed teeth may be broken o Uneven stitching will be caused
86. r to 3 17 Reverse feed cylinder and condensation cylinder Automatic reverse feed device Additional parts list List D No Part No Names of part 40040660 Window plate Assy 40043357 Window plate H PA320150200 Reverse feed cylinder SM6061602TP Setscrew WP0641601SD Washer 21348602 Cylinder connecting screw NM6060003SC Nut 21348503 Reverse feed link mounting base S7151210SP Setscrew 21348701 Reverse feed link SD0800352SP Hinge screw PJ301065104 Straight joint PX015101000 Muffler 21349105 Cylinder gasket HX002950000 Wire mark 1 5 5 gang switch mounting 1 Mount the 5 gang switch Assy on the arm by means of the setscrews 2 positions 2 The cord of the 5 gang switch Assy shall be fixed to the rear side of the arm by means of the cable clips and setscrews fixing positions to as well as cord stopper fittings and setscrews fixing positions and Automatic reverse feed device Additional parts list List E No Part No Names of part Q ty Remarks 40024849 5 gang switch Assy S7110840SP Setscrew HX00123000A Cable clip Fixing positions to S4110815SP Setscrew Setscrews for to D2112555B00 Cord stopper fittings Fixing positions and S6111140SP Setscrews for c
87. read tension 1 3 Defective hook components outer hook 3 A Inadequate adjustment of hook height Re adjust the clearance between the throat plate and the inner hook fastening block 3 B Degective hook scratch or the like Modify or replace the hook 1 4 Defective hook components inner hook 4 A Defective bobbin thread tension adjusting spring Replace the inner hook 4 B Thread tangle due to engagement failure of inner hook Replace the bobbin or the inner hook 4 C The bobbin runs idle in the bobbin case Add an idling prevention spring 4 D Lubrication deficiency Supply oil to the hook 1 5 Thread path is incorrect 5 A Not smooth on thead path Make the thead path smooth 5 B Thread path has scratches on the surface Smooth then the thread path 5 C Thread is caugth in some part of the thread path Thread path modification 1 6 Defective lower bobbin winding 6 A The tension of the bobbin thread is too strong or too weak when winding the thread around the bobbin Adjust the tension 1 7 Needle slot in the feed dog is too small 1 8 Needle used is too thin the thread used Enlarge the needle ho
88. riving arm 11 12 13 14 15 16 17 18 19 20 Loosen the throat plate setscrews 2 positions and remove the throat plate Loosen the screws 10 positions of the throat plate base and remove the throat plate holder Loosen the screws 8 positions of the hook shaft base cover and remove the hook shaft base cover 4 pcs Loosen the left hook shaft base setscrews 2 positions and remove the left hook shaft base Loosen the right hook shaft base setscrews 2 positions and shift the right hook shaft base to the right in advance Loosen the feed dog setscrew 1 position to replace the feed tooth and tighten the feed dog setscrew again The feed dog setscrew shall be tightened at the tightening torque of 5 39 to 6 37Nem Remove the needle bar rocking fulcrum shaft setscrew 1 position Open the face cover and draw out the needle bar rocking fulcrum shaft in the direction of the arrow until the top face of the needle bar can be seen from the top screw hole Insert the accessory hexagon head wrench 2 5mm in the needle bar through the hole of the needle bar rocking fulcrum shaft setscrew and loosen the needle clamp setscrew 1 position that is located in the needle bar Mount the replacing needle clamp on the needle bar and tighten the needle clamp setscrew 1 position In this case the pin attached to the needle clamp shall be adjusted to the groove that is located at the bottom end of the ne
89. rk in the feeding direction Replace the moving knife with anew one 3 The thread trimmer fails to cut the 3 1 Moving knife 1 A Defective shape threads 1 B Defective adjustment amount of position 3 2 The moving knife fails to operate 2 A Defective synchronizer timing 2 B Defective thread trimming timing 2 C Thread trimming solenoid failure 3 3 The moving knife stops during thread 3 A Thread used is too thick trimming 3 B Defective thread trimming timing 3 C Needle thread tension is too high 3 D The bobbin thread tension is too high 3 E The counter knife pressure is too strong 3 4 Counter knife 4 A Defective shape 4 B Defective adjustment amount H 3 5 Condensation system 5 A Pneumatic system 5 B Cylinder failure 3 6 Deviation of work clamp foot from cloth 6 A The moving knife cannot hold the thread at thread trimming securely due to thread bending 3 7 The thread trimmer fails to catch the 7 A Breakage of moving knife tip needle thread 7 B Stitch skipping at the final stitch y 7 C Defective thread trimming timing To the next page Re adjust the timing for the needle and hook Re adjust the thread trimming cam TOI Cause 1 Cause 2 Check Procedure and Corrective Measures Continued from the previous page Ey 3 8 The thread trimmer rails to catch the bobbin thread 8 A
90. rocedures Results of Improper Adjustment Caution 1 In the case of the 2 needle sewing machine the same ad o Stitch skipping or thread break justing values should be secured for both right and left 2 In the case of the thread trimming machine work should be started after the eocking arm and the thread Poorly tense stitches will be trimmer driving joint plate have been removed These caused should be remounted after the completion of this work Refer to 3 18 1 to 9 Thread trimming device age will be caused Adjust the graduations of the feed adjusting dial to 0 Loosen the throat plate setscrews 2 positions and remove the throat plate Loosen the throat plate holder setscrews 1 needle 6 positions 2 needle 10 positions and remove the throat plate holder Loosen the hook shaft base cover setscrews 1 needle 4 positions 2 needle 8 positions and remove the hook shaft base cover Let the sewing machine fall down and loosen the hook shaft gear setscrews 1 needle 3 positions 2 needle 6 positions so that the hook shaft can be made free For PLC 1710 and PLC 1760 remove the hook shaft gear Raise the sewing machine Turn the hand wheel by hand and raise the needle bar from the lowest position to Dimension A Loosen the needle bar connection setscrews 2 positions If they are loosened too much at that time the needle bar will come down Therefore they should be loose
91. rtical dial to 2 Loosen the top feed cam setscrews 2 positions Under the condition that the alternate momentum amount is unified adjust the top feed cam so that a timing can be secured to start rising of the presser foot when the center of the needle hole attains the top face of the throat plate while the needle is lower ing In this state tighten the top feed cam setscrews 2 positions For more details refer to 3 10 2 Alternate momentum amount Install the window plate and the window plate gasket with the window plate setscrews 4 positions Guideline When the thread take up lever is positioned at the lower dead point the first screw of the top feed cam setscrews is faced almost to the front ae o High and low speed pitch errors become worse o High and low speed pitch errors become worse Standard Adjustment 3 Vertical feed cam phase 0 3 to 0 5mm Adjustment Procedures Results of Improper Adjustment For PLC 1710 1760 and 1760L o If the throat plate should come Adjust the graduations of the feed adjusting dial to 0 in contact with the feed dog Let the sewing machine fall down hitting sound will be generated Loosen the vertical feed cam setscrews 2 positions and the throat plate and the feed Turn the hand wheel by hand to the position where the needle dog may be broken coincid
92. sewing speed For max sewing speed refer to 13 List of the sewing speeds Applicable needles Range Schmetz 134 x 35 R Nm 110 toNm 160 Schmetz 134 x 35 R Nm 140 to Nm 200 Standard needle No Standard Nm 140 Standard Nm 200 Applicable thread size 30 to 5 US 46 to 138 Europe 20 3 to 60 3 8 to 0 US 92 to 266 Europe 15 3 to 30 3 Stitch length Max 9mm for both normal and reverse feed stitching Max 12mm for both normal and reverse feed stitching Stitch adjusting system Using a dial Thread take up Using a slide Reverse feed stitching Using hand lever With air cylinder touch back switch Using hand lever Needle bar stroke 36mm 38mm Work clamp listing system Using handle lifer 9mm Using a knee lifter 16mm Automatic presser lifter 16mm Using a knee lifter 16mm Alternate vertical amount 2 5 to 6 5mm 1 to 6 5mm Adjustment of the amount of alternating vertical movement of the walking foot and presser foot Oblong hole slide adjusting system Alternate vertical dial adjusting system DL device Alternate vertical dial Without Provides as standard DL 23 Option DL 23 Safety unit provided as standard Provided as standard Bobbin winder Arm built in type Bottom feed fine adjustment mechanism Provided as standard Used hook 1 6 fold
93. shaft gears and If the safety device is actuated no power is transmitted to the lower shaft such parts may be broken and the hook does not rotate even when the hand wheel is turned In When the release torque is too low such a case the lower shaft sprocket only makes idling o Since the safety device is easily actuated smooth sewing work may be disturbed Method of resetting Check the moving section of the sewing machine to look for the rea son why the safety device has been actuated Remove the possible cause Pressing the push button switch that is located on the top face of the bed Strongly turn the hand wheel by hand in the reverse direc tion When the click sound is heard and the hand wheel cannot be turned any more this is the sign for the completion of the resetting work for the safety device Adjustment of the safety device actuating torque Let the sewing machine fall down Loosen the setscrew 1 position that is located on the outer pe riphery of the lower shaft sprocket and turn the release pressure adjuster pin to adjust the release torque Fix the release pressure adjuster pin by means of the setscrew 1 position Guideline for the release pressure When the direction of the slot of the release pressure adjuster pin is located near the position specified below it corresponds to the release pressure in that case o 24 5Nem First tooth crest of the sprocket o 9 8Nem Inthe center
94. sk No 1 is too high Decrease the needle tension The tension disk fails to release the thread sufficiently at the time of thread trimming Float the disk with the thread release solenoid Timing of thread trimming is too early Adjust the thread trimming cam Moving knife and or the hook has scratches Perform modification or replacement Deviation of work clamp foot from cloth at thread trimming Trim the thread above cloth 1 2 The bobbin thread is not held after thread trimming The installing position of the clamp spring is not correct Re adjust the position Clamp spring pressure is too low Re adjust the spring tension Deformed clamp spring Replace the clamp spring with a new one 1 3 Needle is too thick 1 4 Pressure of the presser foot is too low Replace the needle with a thinner needle 1 5 The needle thead is too thin Increase the pressure of the presser 2 Thread cast off from the needle immediately after thread trimming 2 1 Nonsmooth thread is used Do not run the needle thread under the presser of the thread guide in front of the needle bar guide Change the route of the needle thread to decrease the thread bent points
95. stalling base by means of the moving knife mounting screw 1 position Adjust the height of the moving knife For more details refer to 3 18 1 Adjusting the height of the moving knife Adjust the counter knife and the clamp spring For more details refer to 3 18 2 Adjusting the position of the counter knife and knife pressure and 3 18 3 Adjusting the clamp spring Adjust the position of the moving knife on the right hook shaft base For more details refer to 3 18 8 Adjusting the position of the moving knife Right PLC 1710 7 1760 7 Adjust the position of the moving knife on the left hook shaft base For more details refer to 3 18 9 Adjusting the position of the moving knife Left PLC 1760 7 only Mount the hook shaft base cover by means of the hook shaft base cover setscrews 83 Standard Adjustment 2 Replacing the moving knife PLC 1710 7 1760 7 3 Replacing the counter knife PLC 1710 7 1760 7 4 Replacing the clamp spring PLC 1710 7 1760 7 84 Adjustment Procedures 2 1 2 Replacing the moving knife PLC 1710 7 1760 7 Let the sewing machine fall down Loosen the rocking arm rgiht tightening screw or the rocking arm left tightening screw 1 position each and move the moving knife by hand to the position apart from the counter knife In this state
96. tall the top cover with the top cover setscrews 6 positions For PLC 1710 7 1760 7 1760L Loosen the top cover setscrews 6 positions and remove the top cover Loosen the oil tank setscrews 2 positions and remove the oil tank Loosen the balancer setscrews 2 positions Turn the hand wheel until the first screw of the main shaft counterbal ance setscrews 2 positions is faced upwards If a 4mm hexagon head wrench is inserted in the hole of the sew ing machine top face at that time it becomes easy to check the posi tion of the main shaft counterbalance Let the first screw of the balancer setscrews 2 positions coin cides with that of the main shaft counterbalance setscrews 2 po sitions and then tighten the balancer setscrews 2 positions At that time a clearance of 0 8 to 1 0mm should be secured between the balancer and the main shaft front metal Install the oil tank with the oil tank setscrews 2 positions Install the top cover with the top cover setscrews 6 positions 3T o Vibration is increased 15 Position of reverse feed lever Standard Adjustment O PLC 1710 1760 PLC 1710 7 1760 7 PLC 1760L 38 Adjustment Procedures Results of Improper Adjustment For PLC 1710 1760 Adjust the graduations of the feed
97. ted the tip of the needle bar may interfere with the feed foot and the feed foot may be broken When the amount of presser rise is too less o Since the rise of the presser is insufficient the workability can become worse 9 Timing belt setup Standard Adjustment Parallelism The figure shows a view as seen from the hand wheel side 2299 Adjustment Procedures Results of Improper Adjustment Adjust the graduations of the feed adjusting dial to 0 Let the sewing machine fall down Turn the hand wheel by hand and adjust the needle bar to the lowest position Turn the lower sprocket by hand until the second screw of the lower sprocket comes in parallel to the top face of the bed Apply the timing belt to the lower sprocket This action should be taken in the state that the timing belt is correctly hung on the upper sprocket Raise the sewing machine 23 o The tightness of stitches becomes poor o The feeding phase and the tim ing between needle and hook may be changed 10 Feed motion Standard Adjustment 1 Alternate vertical amount Ss Guideline for the alternate vertical amount Upper engraved line Approx 5mm Middle engraved line Approx 4mm Lower marker line Approx 3mm Standard Adjustment
98. ted on the arm s opposite side of the worker and remove the side cover PLC 1710 1760 1760L only Loosen the presser bar connecting bracket tightening screw 1 position in the state that the presser lifting lever is lifted Adjust the amount of presser rise to 9 0 8mm In this case adjust ments become easy if a sewing material of 9mm in thickness is in serted in between the top face of the throat plate and the bottom face of the presser foot After adjustments tighten the hook shaft base screw 1 position Prior to tightening confirm that there is no contact between the presser foot and the feed foot Remove the object inserted in the clearance between the top face of the throat plate and the bottom face of the presser foot Install the side cover and tighten the side cover setscrew 1 position PLC 1710 1760 1760L only Using a knee lifter PLC 1710 1760 1760L Remove the knee patch plate and let the sewing machine fall down Loosen the stopper nut 1 position and adjust the lifting amount by changing the screw in value of the stopper screw Adjust the distance to 16 0 5mm between the top face of the throat plate and the bottom face of the presser foot Make sure not to move the stopper screw while the stopper nut is tightened o Stopper screw tightened Decrease in the amount of rise o Stopper screw loosened Increase in the amount of rise Auto presser lifter P
99. tetsccncaccsnscaeteccccedeniseeccenadccencasienccceaniecexcnte 2 PEC TV cs ses hess ari cease a anata ieee a Gein era ies ba clad al ae ce 2 2 PEG TOO arses a hectare ir A eat oles al ae Saal 3 BG a el eg 0 e Re A a a a Ree ni ree aaa Ee re rece A aAa Ea DAE aaia 4 CAPE COO 0 E E A A TE 5 3 Standard adjustMent iesssedecccs tencascihen taccctbcwdeteiiendacssssceeatecacedaniditcedadeaaandeces teccastiaesdate 6 1 N edle entry POSITION icini atatiaewede Seadiveccctteadalent atiindestiadaadecsata ical oenermiacateact 6 2 Adjustment of the feed dog position ccccsessseeeeneneeseeeenseseeneeeeeeseensnseeeeeeeeseseseeeenaneoee 8 3 Clearance between the throat plate and the inner hook clamp Section ccsssssseee 10 4 Height of the feed dG ssicsssatisaccadivccteasa fant stove soendei rodeo taeda shcedentaleansudatia lands lath bde aavarveasanceent 12 5 Timing between the needle and the hook Except for PLC 1760L cccccsssseeseeeeees 14 6 Timing between the needle and the hook PLC 1760L ccceccsseseeeeeeeeeeeeeeeeneseeneeees 16 7 Adjusting the inner hook guide s ivvseicccevecsesiccedssessasietecwenedvariudcssnedaderdcaseetautacauinrendnwedandTduess 18 8 Lifting amount of presser iccuharesdiesedies casun deeiiedecietee ded caanees dead dunvivanvausenewendieeadeudtanitatdduaieauaanand 20 i Presser MOM IOVER coo cicecccccecdcec cece sscececcceccsccccccescccssncnceasececcecec ceccescessecassescetes
100. the feed bar fork up and down so that the height of the feed dog can be adjusted to Dimension A Firmly tighten the setscrew of the feed bar fork For PLC 1710 1760 and 1760L Adjust the graduations of the feed adjusting dial to 0 Turn the hand wheel and stop it where the amount of protrusion of the feed dog appearing from the throat plate top face be comes maximum Loosen the setscrew of the vertical feed link shaft and turn the vertical feed link shaft until the height of the feed dog adjusted to Dimension A Tighten the vertical feed link shaft setscrew firmly ee If the height of the feed dog is excessive o The pitches of stitches become greater than the graduations of the feed adjusting dial o Isolated idling loops will result o Areturn of the sewing object is caused If the height of the feed dog is insufficient o The pitches of stitches become smaller than the graduations of the feed adjusting dial o The feeding force is weakened 5 Timing between the needle and the hook Except for PLC 1760L Standard Adjustment Model Dimension A Dimension B PLC 1710 2 5mm 2 2MM PLC 1710 7 2 6mm 2 0mm PLC 1760 2 5mm 2 2mm PLC 1760 7 2 9mm 2 0mm 0 05 to 0 1mm 0 1 to 0 2mm 14 Adjustment P
101. the case of the PLC 1760L Turn the hand wheel by hand and confirm whether the vertical amount of motion is kept almost equalized between the feed foot and the presser foot If the vertical amount of motion seems to be different loosen the upper feed rear arm setscrew until equalized balancing is secured Make adjustments until the condition of A B is secured by visual check When the vertical amount of motion is too much in the feed foot 1 In the state that the feed foot is somewhat lifted loosen the upper feed rear arm setscrew and press the feed foot against the feed dog Tighten the upper feed rear arm setscrew again and examine the vertical amount of motion by turning the hand wheel When the vertical amount of motion is too much in the presser foot 1 In the state that the presser foot is somewhat lifted loosen the upper feed rear arm setscrew and press the presser foot against the throat plate Tighten the upper feed rear arm setscrew again and examine the vertical amount of motion by turning the hand wheel by hand _27 For certain types of sewing materials the vertical amount of motion of the feed foot should be increased more than that of the presser foot o Sewing of sponge materials o Sewing of stepped sections When the vertical amount of motion is extremely different o The pitches of stitches become different from the graduations of the dial o Since the feedi
102. the hinge screw on the cylinder connecting screw At that time Lock Tight 243 shall be applied after the degreasing of the threaded section of the hinge screw Install the cylinder connecting screw and the nut on the Auto presser lifting cylinder Guideline Tighten the nut after the distance has been adjusted to 24mm between the piston rod end face of the Auto presser lifting cylinder and the end face of the cylinder connecting screw Tighten the cylinder stay front and cylinder stay rear on the Auto presser lifting cylinder with the setscrews each 2 positions Mount the Auto presser lifting cylinder which has been assembled as per 6 above on the arm by means of the setscrews 4 positions Assemble the Auto presser lifting lever B in the Auto presser lifting lever A Insert the Auto presser lifting lever shaft and tighten it with the hexagon head bolts 2 positions Mount the Auto presser lifting lever A which has been assembled as per 8 above on the arm by means of the Auto presser lifting lever shaft When the Auto presser lifting lever A is mounted on the arm the hinge screw is required to settle in the groove of the Auto presser lifting lever B Apply grease to the hinge section of the Auto presser lifting lever shaft and apply Lock Tight 243 to the threaded section after the degreasing Automatic presser lifter device Deletion parts list No Part No Names of
103. tic thread trimmer 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PLC1710S70BAK136B AA 8 Type clasification S Standard 12 to 17 Classification of automatic presser lifter AK136B AK 136B with pedal switch type 19 Place pf destonation Standard 20 Accessories type Standard 4 PLC 1760 7 Model name Post bed 2 needle unison feed lockstitch machine with a vertical axis large hooks with automatic thread trimmer 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 PLC176085 70BAK1 3 6 19 20 21 22 B AA Standard With center guide 14 to 19 Classification of automatic presser lifter AK136B AK 136B with pedal switch type 21 Place pf destonation Standard 22 Accessories type Standard 3 Standard adjustment 1 Needle entry position Standard Adjustment o PLC 1710 1760 1760L o PLC 1710 7 1760 7 m Model Dimension A PLC 1710 PLC 1760 PLC 1710 7 PLC 1760 7 PLC 1760L 9 9 0 15mm 9 5 0 15mm 10 520 15mm Adjustment Procedures Results of Improper Adjustment For PLC 1710 1760 and 1760L Adjust the graduations of the feed adjusting dial to 0 Turn the hand wheel by hand and adjust the needle bar to the lowest position Loosen the window plate setscrews 5 positions located behind the
104. w 21438700 Alternate vertical link support S4110815SP Setscrew Q ty 8 8 8 6 0 F P Nh gt a oa ost ys DL device Additional parts list List H No Part No 40040663 PA320200100 PJ304065102 PX015101000 21438403 SD0600403TP Names of part Window plate F Assy Jig cylinder Elbow Muffler Cylinder connecting screw Hinge screw attaching to cylinder connecting screw NM6080721SE Cylinder connecting screw nut 21437207 Window plate F SM6044002TP Jig cylinder setscrew HX00295000C Wire mark 4 lt 7 2 Installation of the air related devices 5 gang switch 72 Acover and setscrews 2 positions are mounted on the mounting face of the solenoid valve P Assy Mount the solenoid valve Assy of the kit by means of the setscrews 2 positions Loosen the setscrews 2 positions Replace the stop plug and mount it on the one touch joint Disconnect the connector CN20 from the cords of the 5 gang switch Insert the cords and of the solenoid valve Assy in the connector CN20 This work should be carried out after confirming the inserting position The cords of the solenoid valve Assy shall be passed through the tubes and then inserted in the
105. w plate setscrews 4 positions Caution Confirm that the reverse feed lever does not interfere with the arm or the post when the graduations of the feed adjuster dial are set at the maximum position 39 When the reverse feed lever is positioned too low o Atthe time of reverse feed stitch ing the reverse stitch pitches may be decreased as a result of interference between the reverse feed lever and the post When the reverse feed lever is po sitioned too high o The forward feed stitch pitches may be decreased as a result of interference between the reverse feed lever and the arm When the clearance is too large between the reverse feed lever and the stopper o Inthe case of reverse feed stitch ing with the reverse feed lever the reverse feed lever may interfere with the post thus de creasing the reverse feed stitch pitches When the clearance is too small between the reverse feed lever and the stopper o The reverse feed lever may interfere with the reverse feed leve stopper thus decreasing the forward feed stitch pitches 16 Safety mechanism Standard Adjustment Guideline for the release pressure 40 Adjustment Procedures Results of Improper Adjustment The safety device will be actuated if unreasonable forces are exerted on When the release torque is too high the lower shaft and others during operation o The hook lower

PLC-1710-7, 1760-7

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