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Contents
1. United States Patent 19 Bartels Manfred tt 3 885 405 451 May 27 1975 54 SYSTEM FOR SELECTING THE NEEDLES OF A KNITTING MACHINE ACCORDING TO A PROGRAM 75 Inventor Bartels Manfred Cologne Germany 73 Assignee Empisal Knitmaster Luxembourg S A Luxembourg 22 Filed July 8 1974 21 Appl No 486 698 30 Foreign Application Priority Data July 7 1973 Germany 2334654 May 11 1974 Germany 2422880 52 66 75 66 154 A 51 VEL iran rara D04b 7 00 58 Field of Search 66 75 154 A 126 R 127 64 66 78 60 56 References Cited UNITED STATES PATENTS 2 157 989 5 1939 Lawson 66 75 2 821 073 1 1958 Mebnen 66 75 X 3 472 287 10 1969 Ribler 66 75 UX 3 641 788 2 1972 Mori et al 66 154 A 3 1 3 717 014 2 1973 Kobler 66 75 R 3 818 728 60 1974 Ebanistas 66 75 FOREIGN PATENTS OR APPLICATIONS 45 34786 7 1970 Japan A 66 75 1 445 318 5 1966 France 66 75 1 082 420 12 1954 France 66 75 Primary Examiner Ronald Feldbaum Attorney Agent or Firm Diller Brown Ramik amp Wight 57 ABSTRACT This disclosure relates to a knitting machine which in cludes a needle bed having a plurality of needles mounted thereon2. 40 45 50 60 10 means including a gating circuit connected to said reading head and said pulse generator means for trans mitting a signal generated by said reading head only in the simultaneous presence of an interval pulse from said pulse generator means and arm setting means op erable in response to said signal to set a corresponding arm of said data storage dial 2 A needle selecting system according to claim 1 wherein said circuit means includes a selectively opera ble inverting switch for providing said signals in in verted relation to said data carrier and provide a pat tern which is the negative of said data carrier pattern 3 A needle selecting system according to claim 1 wherein said reading head is a photo electronic reading head responsive to reflected light and includes a light source and a photo electric transducer 4 A needle selecting system according to claim 1 wherein said pulse generator means includes a second reading head carried by said carriage and fixed interval markings carried by said needle bed 5 A needle selecting system according to claim 1 wherein said circuit means includes a multivibrator of the tye which changes state when an output signal of said reading differs from a next preceeding signal si multaneously with the presence of one of said interval pulses 6 A needle selecting system according to claim 5 wherein said multivibrator is of the type which auto matically resets at th
3. for energization thereby in timed relation to the movement of the carriage 13 along the needle bed 10 It is to be understood that the color of the yarn on a bobbin 264 will correspond to the color to which the reading head 16a selectively re sponds and the same is true of the other reading heads and bobbins Only two preferred embodiments of the invention have been specifically illustrated described herein it is to be understood that minor variations may be made in the lever arm setting systems without departing from the spirit of scope of the invention as defined by the appended claims I claim 1 A system for selecting needles of a knitting ma chine of the type including a needle bed supporting a plurality of needles disposed in side by side relation and a carriage mounted on said needle bed for move ment transversing said needle a mechanical data stor age dial carried by said carriage and including a plural ity of arms settable to actuate the needles in a pattern a data carrier associated with said needle bed for tra versing by said carriage and control means responsive to said data carrier for automatically setting said arms said control means including a reading head carried by said carriage for scanning said data carrier pulse gen erator means carried by said carriage for generating an interval pulse when said carriage traverses a distance equal to the spacing of adjacent needles and circuit 20 25 30 35
4. in side by side relation Also mounted on the needle bed for traversing movement is a carriage The carriage is provided with a pair of me chanical data storage dials one of which has needle setting arms thereof set in accordance with the pattern of a data carrier and the other of which has the arms thereof already set with the arms set in needles as the carriage traverses the needle bed The data carrier may either be in the form of a preprinted program sheet or a base sheet adapted to have placed thereon by the individual the desired pattern data 10 Claims 9 Drawing Figures a FAH i UA 3 885 405 1 SHEET Bia eV 0 O ee peo oo PATENTEDEAY 27 1975 2 885 405 SHEET Po DATA CARRIER 14 FABRIC KNITTING MARK cee NA DV I DS cs FIG 3 3 405 3 88 a MT ope I Eri e r r E PATEN CEPAS 3 SHEET dpngotiptoercpag Bilip parda betette a na ATT li PATENTEDEAY27 1975 2 885 405 SHEET 4 a A FIG 7 y Tt ESZEBE BET pp Y ii 4 ERA EE SR peso elba ig 3 885 405 1 SYSTEM FOR SELECTING THE NEEDLES OF A KNITTING MACHINE ACCORDING TO A PROGRAM This invention relates in general to new and useful improvements in knitting machines and more particu larly to a system for selecting the needles of a
5. le vers in a circle corresponding to 24 pattern in a line on the data carrier 14 With reference to FIGS 7 and 8 wherein there is il lustrated for example the data storage dial 17 it will be seen that the data storage dial includes a fixed shaft 60 which is suitably mounted on the carriage 13 The shaft 60 is provided with a mounting head 61 on which 3 885 405 5 a plurality of the lever arms each generally identified by the numeral 62 is centrally pivotally mounted by means of a retaining member 63 Each lever arm 62 is vertically disposed and has a rounded upper end portion 64 which in the operative position of the lever arm bears against an upper stop 65 The upper portion 64 is held against the stop 65 by means of a ball detent 66 which is seated in a retaining plate 67 carried by the upper part of the mounting head 61 for rotation therewith The ball detent 66 is urged downwardly by means of individual spring elements 68 of a spring plate 70 An upper disc 71 and a nut 72 hold the plate 67 and the spring plate 70 in place Movement of the lever arms 62 from their operative positions to an inoperative position is accomplished by means of an electromagnet unit 29 in association with a lever 74 pivotally mounted on the carriage 13 as at 75 and having a lever arm engaging portion 76 When the electromagnet unit 29 is energized the lever 74 is pivoted in a counterclockwise direction with the lever arm engaging port
6. 5 50 55 65 4 data store must be capable for each needle of storing the required color information obtained from a color reading head In the course of the next traverse of the carriage along the length of the needle bed this color information is then submitted to the thread carrier at the same time as the needle selection takes place the thread carrier insuring that the correctly colored yarn is presented to the appropriate needle With the above and other objects in view that will hereinafter appear the nature of the invention will be more clearly understood by reference to the following detailed description the appended claims and the sev eral views illustrated in the accompanying drawings IN THE DRAWINGS FIG 1 is a schematic top perspective view of a hand knitting machine in accordance with this invention FIG 2 is a block diagram of the signal processing sys tem for the data input into the data storage dial of the machine of FIG 1 FIG 3 is a schematic view showing the sequence of pulse trains for different modes of operation of the sig nal processing system of FIG 2 FIG 4 is a top perspective view similar to FIG 1 and shows a hand knitting machine for knitting in several colors FIG 5 is a block diagram of the wiring schematic for the system of FIG 4 FIG 6 is a schematic view showing the details of one of the reading heads FIG 7 is a schematic sectional view taken through one of the data stora
7. a carrier 14 This base serves for the generation of an interval signal The marking lines of the base 19 are so located that each line is exactly mid way between two grid lines of the data carrier 14 The markings of the grid base 19 are sensed by a second reading head 20 carried by the carriage 13 Referring now to FIG 6 it will be seen that the read ing head 16 has been schematically illustrated as in cluding a light source 86 and a photo electric trans ducer 87 Light is directed onto the data carrier 14 by the light source 86 and is reflected into the pick up of the photo electric transducer in the manner schemati cally illustrated It is however pointed out here that as previously described the light source 86 may in clude a bundle of light conducting fibers which convert the light emitted by a light conductor and in the middle of the bundle of light conducting fibers there will be positioned a further fiber or fibers which transmit the reflected light to the photo electric transducer 87 The signal processing system will be best understood by ref erence to FIG 2 The signal from the reading head 20 is applied by means of a pulse control circuit 21 to a monostable multivibrator 22 which remains in its non stable state for only a few useces and generates short square wave pulses of defined length and amplitude The threshold circuit in conjunction with the monosta ble vibrator 22 forms an interval pulse generator which genera
8. ds is transferred to one of the data storage dials 17 18 The information as to which of the three reading heads has responded at any particular pattern point is also stored in a color data storage register which can be secondly read With reference to the wiring schematic of FIG 5 when one of reading heads 16a 16b 16c responds each reading head being responsive to a different color this color information is taken to the color data storage register or store 40 However the information is not stored until the reading bead 20 has generated an inter val signal which is applied by way of a pulse forming circuit 41 to an interval pulse input of the color data store 40 At this time it is pointed out that the pulse forming circuit 41 corresponds to the threshold circuit 24 FIG 2 The signal from any one of the reading heads 164 16b 16c is taken to an OR GATE 42 which combines these output signals for operating a threshold circuit 43 which generally corresponds to the threshold circuit 21 of FIG 2 The threshold circuit 43 triggers a monosta ble multivibrator 44 which corresponds to the multivi brator 22 A pulse of specific length will appear in the output of the multivibrator 44 only when at the in stance of the interval pulse one of the three reading heads 16a 16b 16c respond to a marking on the data carrier 14 In the same way as the multistable vibrator 3 885 405 9 44 is actuated the color data store 40 is tr
9. e end of a predetermined maxi mum operated time 7 A needle selecting system according to claim 1 wherein said carriage is mounting on said needle bed for back and forth movement there are two of said data storage dials each operable in one direction of movement only of said carriage with that data storage dial which is inoperable being reset by said control means 8 A needle selecting system according to claim 7 wherein there are separate ones of said arm setting means associated with each of said data storage dials and said circuit means includes a selector switch for se lecting the appropriate arm setting means in accor dance with the direction of movement of said carriage 9 A needle selecting system according to claim 1 wherein said data carrier is in the form of a grid bearing sheet suitable for having a pattern applied thereto 10 A needle selecting system according to claim 1 wherein said knitting machine is of the type for selec tively applying threads of different colors said data carrier is of multiple colors in accordance with the dif ferent colors of thread there are a plurality of said reading heads each responding to a different one of a plurality of selected colors and said circuit means in cludes a color data store for selectively presenting to selected needles a thread in accordance with said data carrier k k k k g
10. egarding the scanned information is thus avoided When the invention is applied to a hand knitting ma chine it is preferred to provide a photo electronic method of scanning in which the data carrier bearing color marks is scanned by a photo electric transducer The color marks may be pencil lines or pencil dots ap plied by the user of the knitting machine to a data car rier material This enables a housewife to design her own patterns and to draw the pattern on paper bearing a line grid which then serves as a data carrier All she has to do is to black in certain squares or to mark them with dots or dashes and to leave other squares blank The interval signal which is substantially shorter than the time needed for the carriage to move from one nee dles to the next insures that the electronic evaluation of the coated markings will be effected in the center of each coating square Any uncertainity interpretations is thus excluded A very advantageous feature of the invention is the possibility of using a data carrier which bears no refer ence grid and which contains a representation of the pattern that is to be knitted in the form of continuous contour lines and colored areas This arrangement per mits a data carrier made of paper or plastics materials to be used upon which a pattern or design has been drawn in continuous contour lines or by coloring areass with areas suitable crayon or the like since the needle selector according to the i
11. eing reset by the coating pins according to the next row of the pattern In such prior hand knitting machines the transmis sion of the coated pattern to the needles is purely me chanical notwithstanding the fact that punch pattern cards are used The selection of the coating pins by the holes in unpunched areas of the pattern card is also me chanical This leads to considerable wear of the pattern cards which must be made of strong material and pro duced at the knitting machine factory Moreover the selection of the coating pins is rather noisy If a house wife desires the program her own pattern the produc tion of a pattern card is extremely difficult and can be accomplished only with the help of a special punching tool It has been proposed to mount a data carrier directly on the carriage and to read the data carrier by photo electronic means The data carrier may be in the form of a perforated disc which rotates together with the data storage dial According to perforations i e the light permeable openings in the disc the lever arms of the data storage dial are deflected or left in their posi tions of rest The presence of the data carrier on the data storage dial in many instances in undersirable Furthermore once again such data carrier requires punching which is difficult for the average home knit ting machine to effect In view of the foregoing it is an object of this invention to provide a programmed nee dle selecting s
12. ge dials FIG 8 is a fragmentary plan view of the data storage dial of FIG 7 and shows further the details thereof FIG 9 is a schematic elevation of a modified dial Referring now to the drawings in detail it will be seen that the knitting machine of FIG 1 includes a needle bed 10 containing a large number of knitting needles 11 tricked into the bed in side by side relation Ways 12 extend along the length of the bed for the manual traverse of a carriage 13 During the carriage traverse the needles 11 are operated according to a preset pro gram by selector arms mounted within the carriage 13 and not visible in FIG 1 but to be in part described hereinafter The program i e the pattern that is to be knitted is determined by a data carrier 14 The data carrier 14 may be in the form of a sheet of squared paper attached to a holder 15 and adapted to be intermittently fed from line to line The data carrier 14 is scanned by a reading head 16 or sensor which projects from the car riage 13 and passes across the data carrier 14 without actually contacting the same The data is supplied on the data carrier 14 in the form of dots or dashes or may have the form of contin uous contour lines or surface areas The data is scanned by the reading head 16 and the information is trans ferred to data storage dials 17 18 which will be de scribed in more detail hereinafter At this time it is pointed out that each of the dials 17 18 contains 24
13. ial 17 will set the lever arms 91 of the dial 90 Then after the lever arms of the dial 17 have rotated about 270 they will engage the resetting cam 84 and be automatically reset With particular reference to FIG 9 it will be seen that the auxiliary data storage dial 90 is mounted for upward movement During the time the lever arms 62 are actuating the lever arms 91 the dial 90 will be in its elevated position wherein the arms 91 thereof will rotate above the butt 92 of the associated needle 11 Thus the dial 90 will be inoperative to move the needles 11 in the traverse of the carriage 13 at which time the information is being transmitted to the particular dial 17 or 18 in question Then at the end of the data trans mitting traverse for the particular auxiliary data storage dial that dial will be lowered to its solid line position 0 20 25 30 35 40 45 55 65 8 of FIG 9 so as to be operative on the needles 11 during the return traverse of the carriage 13 It is to be understood that the knitting machine which is only fragmentarily illustrated in FIG 9 is a known knitting machine and is known as Model 321 Knitter of Empisal Knitmaster Luxembourg S A located at 2 bis Boulevard Royal Luxembourg A more complete dis closure of the dial arrangement of FIG 9 is found in the Service Manual for Model 321 Knitter see FIG 34 on page 30 and the Supplement To Service Manual for Model 321 Knitter July 1972 both re
14. iggered by the output signal of the pulse forming circuit 41 It is to be understood that the threshold circuit 43 in conjunction with the multivibrator 44 forms an interval pulse generator which generates pulses at a repetition frequency corresponding to the traverse of the carriage 13 These pulses control a second monostable multivi brator 45 which works in the manner of a gate It is to be understood that a pulse of a prescribed length ap pears in the output of the multivibrator 45 only when one of the reading heads 16a 16b 16c responds to a mark on the data carrier 14 The output signals of the multivibrator 45 are applied by way of an amplifier 46 to the electromagnet 29 of the data storage dial 17 or 18 A selector switch 47 corresponding to the selector switch 30 controls the electromagnet 29 to which the output of the amplifier 28 is directed with the selector switch 47 being oper ated when the carriage 13 changes direction One of the three colors of yarn 26a 26b 26c is asso ciated with each of the reading heads 16a 16b 16c The three yarns run into the carriage 13 and can be in dividually engaged by thread carriers 49a 49b 49c The thread carriers are controlled by the color infor mation store 40 in such a way that the correct thread is engaged with the needle To this end thread carrier selectors 48a 48b 48c for the thread carriers 49a 495 49c respectively are provided and are connected to the color data store 40
15. ion 76 engaging that lever arm 62 then aligned therewith so as to move the lower part of the lever arm radially inwardly to an inoperative posi tion against a lower stop 77 In order to effect such movement of the lever arm 62 it is necessary that the upper portion 64 thereof pass beneath the associated ball detent 66 It will be readily apparent from the right hand upper part of FIG 7 that the ball detent 66 func tions to retain an associated lever arm 62 in its set posi tion so that each lever arm is bistable The lower part of the head 61 is provided with a gear 77 which is engaged with a fixed rack 78 carried by the needle bed 10 Thus when the carriage 13 moves from one needle to the next each of the data storage dials 17 18 is indexed by the annular pitch of adjacent lever arms Each of the lever arms 62 is provided with a project ing part 80 which is engageable with a follower 81 of a lever arm 82 pivotally mounted on a pivot 83 The lever arm 82 actuates the mechanism which in turn sets the needles 11 It is to be understood that the lever arm 82 may be selectively shifted to an inoperative po sition so that the particular data storage dial with which it is associated will be inoperative to set the needles 11 It is also pointed out here that each of the data stor age dials 17 18 has associated therewith a reset device 84 The reset device 84 is in the form of a cam which when properly positioned will engage the lower por
16. is to be understood that if this occurs the operative mag net 29 will then be de energized This type of safety de vice is particularly advisable in the case of battery oper ated machines At this time it is pointed out that the data carrier 14 is to be advanced after each traverse of the carriage 13 The advance may be manual or if desired some suit able advancing mechanism may be provided It is also pointed out here that after each traverse of the carriage 13 the needles 11 are manually reset in any desired manner Although in FIGS 7 and 8 there has been illustrated schematically the data storage dial 17 the means for setting the lever arms thereof and the means for both resetting the lever arms and for transmitting the influ ence of the lever arms to the needles used to be under stood that in actuality the details could be quite differ ent As is shown in FIG 9 each of the data storage dials 17 18 may have associated therewith an auxiliary data storage dial 90 have having merit thereon needle actu ating lever arms 91 The auxiliary data storage dial 90 will have the same number of lever arms 91 as the num ber of lever arms 62 on the main data storage dial 17 It is to be understood that the auxiliary data storage dial 90 will rotate synchronously with the correspond ing main data storage dial 17 and as the two data stor age dials rotate the lever arms on the two dials will in teract so that the lever arm 62 of the d
17. knitting machine particularly a hand knitting machine accord ing to a program The knitting machine includes a car riage traversable along the length of a needle bed and containing mechanical data storage dials which store the data representing a pattern when the carriage tra verses a data carrier associated with the needle bed and which mechanical data storage dials set the ele ments operating the needles by means of a selector arm In hand knitting machines in which the needles are tricked side by side into a needle bed a carriage is movable across the needles along the length of the bed for operating the elements controlling the needles by reference to a selectable program so that the needles will knit the corresponding pattern In prior machines the pattern is provided in binary coated form and in the form of a punch card which can be inserted alongside the needle bed in an intermittently feeding card holder The punched holes in the card cause projecting coating pins to be displaced when the card is inserted When the carrier traverses the coating pins a data storage dial on the carrier is set according to the coated pattern and transfers this by means of a selector arm to the element controlling the knitting needles As a rule one data storage dial each is provided for traverse and return of the carriage so that one of the data storage dials can se lect the needles for knitting a row of the pattern while the other storage dial is b
18. lating to the Mode 321 Knitter of Empisal Knitmaster Luxembourg S A 2 bis Boulevard Royal Luxembourg Reference is now made to FIGS 4 and 5 wherein a slightly modified form of knitting machine is illustrated Basically the knitting machine is the same except that the reading head 16 is modified so as to be utilized on conjunction with a multicolor for example three col ors data carrier 14 The program i e the pattern that is to be knitted is provided on the data carrier 14 which may be in the form of a sheet or card made of paper or plastics mate rial Both longitudinal edges of the card are provided with perforations 14 to permit a reliable line for line feed The data carrier 14 is scanned by a cluster of reading heads 16a 16b 16c which each respond to a different preselected color These reading or scanning heads are mounted on the carriage 13 which is tra versed past the data carrier 14 without touching the same in the manner described above with respect to the embodiment of FIG 1 The data on the data carrier 14 forms a pattern of surface areas or continuous lines If the pattern consists of lines they should have a predetermined minimum thickness depending upon the needle gauge and the needle bed 11 The pattern scanned line for line by the cluster of reading heads 16a 16b 16c which are prefer ably adjusted to scan the same points simultaneously The information in the form of the signal for one of the reading hea
19. nvention will then automati cally convert the pattern into a patterned knitting The data carrier may be written or painted upon with a felt pencil or a wax crayon The only requirement is that the contour must be sufficiently well defined to permit the photo electric scanning device to discriminate reli ably between colored and plain areas The division of the data carrier surface into the surface elements of a grid is therefore performed by the selecting system it self Notwithstanding the proposal to have the housewife prepare her own pattern ready printed data carriers can be supplied The printing of attractive patterns is a matter of presenting no technical difficulties On the other hand as set forth above a pattern may also be applied to the data carrier by hand Transfers scissor 3 885 405 3 cuts and so forth can also be applied to the data carrier The invention further permits a data carrier to be provided with lettering which can be converted to a knitted pattern In a preferred embodiment of the invention an opti cally operable inverting switch is provided to permit a negative of the pattern on the scan data carrier to be knitted This inverting switch thus provides the simplest possible means of inverting pattern for instance by transposing the colors in a two color pattern This sim ple switch thus saves the work of interchanging the yarns The function of the switch is merely to energize the magnet which co
20. operates with the lever of the data storage dial at the particular times at which it should be de energized in accordance with the original patterns and conversely For the purpose of scanning the data carrier several possibilities are available to a person skilled in the art For example scanning may be performed with the aid of an inductive reading head using a high frequency os cillating circuit which is damped or detuned by the presence of a damping medium in the magnetic field Magnetic scanning which avails itself to the Hall effect or of field plates is also feasible However in practice it may be preferred to make use of a photo electric sys tem of scanning For such a purpose suitable reading heads which work by reflected light are available Such reading heads comprise a light conductor which con veys the light beam from a luminescence diode an in candescent lamp or the like to the point which is being scanned In the middle of the bundle of light conducting fibres is a phototransistor or the like which converts the light emitted by the light conductor and reflected by the data carrier into electrical signals Such photo electric reading heads can without diffi culty be designed to have a resolving power on the order of 1 10th of a millimeter For the generation of the interval pulses diverse pos sibilities are also available For example the interval pulse generator may be connected to the data storage dial to generate p
21. tes pulses at a repetition frequency correspond ing to the speed of traverse of the carriage 13 These pulses control a second monostable multivibrator 32 which functions as a gate The photo electric reading head 16 scans one line of the data carrier 14 at a time The data may be provided on the data carrier 14 in the form of black dashes or dots The output signals of the reading head 16 are di rected to a threshold circuit 24 having two complemen tary outputs A A These complementary outputs are alternatively connected by a switch 25 to the signal input of the second monostable multivibrator 32 which has an operate of a few m secs As is shown in FIG 3 line a the intervals pulses ap plied by the pulse generator to the gate 32 are shown as a function of time In line b there is shown the output signal of the monostable multivibrator 32 when the switch 25 is in position A It will be seen that a pulse of prescribed length appears in the output of the mono stable multivibrator 32 only when the reading head 16 responds to a mark on the data carrier 14 Conversely when the switch 25 is in the position A the resultant output of the monostable multivibrator 32 will be that shown in line c of FIG 3 in which the pulses appear at the time when the pulses in line b are ab sence Hence by operating the switch 25 the comple ment of each pattern can be selected and knitted The output signals of the monostable multivibrator 32 are supplied b
22. tion of each lever arm 62 as the data storage dial ro tates to move the same from its rest position to its op erative position The cam 84 may be selectively moved between its operative and inoperative positions so that at the end of a traverse of the carriage 13 wherein the particular data storage dial was operative to set the needles may be reset to their operative positions so that on the return traverse of the carriage the lever arm 62 of that particular data storage dial may again be reset by the pattern setting system In the position of the carriage 13 shown in FIG 1 the lever arms 62 of the data storage dial 17 causes the nee dles 11 to be operated according to the preset program when the carriage is traversed to the left The lever 82 of the data storage dial 18 is set so as to have no effect on the needles As the reading head 16 passes over the data carrier 14 the data is read and stored in the data Storage dial 18 which has been previously reset The data storage dial 18 does not transfer its information to 20 25 30 35 40 45 30 55 65 6 the needles 11 until the following return traverse to the right of the carriage 13 while the data storage dial 17 is being set according to a fresh row of data from the data carrier 14 Referring once again specifically to FIG 1 with ref erence also being made to FIG 2 it will be seen that the needle bed 10 carries a grid base 19 across the width of the dat
23. ulse whenever the carriage is tra versed a distance equal to the needle spacing and the dial has been indexed accordingly In such a case ar rangements must be made to insure that the interval signals will be effective only when the scanning head crasses the data carrier In other words means must be provided for switching the interval pulse generator on and off An alternative possibility is to provide marks on the needle bed and to scan these marks by a reading head of an interval pulse generator The marks should be pitched to equal the needle spacing and cooperate with the reading head of the interval pulse generator without direct contact therewith This type of reading head is also readily available and advantage can be taken of one of the several possibilities that have al ready been described In order to facilitate the accurate feeding of the data carrier for a line by line scan the data carrier is pro vided with perforations along its longitudinal edges In a preferred embodiment of the invention several optical reading heads which respond to different col ors are provided to feed the scanned color information to a color data store on the carriage which color data store controls the provision of the correspondingly col ored yarn to the appropriate loop forming needle Such an arrangement is capable of automatically producing acolor knitting by copying a colored pattern The color 10 15 20 25 30 35 40 4
24. y way of an amplifier 28 selectively to the electromagnet 29 of one of the data storage dials 17 18 A selector switch 30 is operated when the car riage 13 changes direction so that the results of the 3 885 405 7 scan are transferred in alternation to the magnet 29 of one or the other of the data storage dials 17 18 tis to be understood that it is possible to change the operating time of the monostable multivibrator to three secs for example if a particular mode of operation of the magnets 29 is desired For instance if the multivi brator 32 is set at a particular interval time by a pulse from the threshold circuit 24 it may remain in its posi tion until at one of the following interval times no pulse is received from the threshold circuit 24 and the multi vibrator 32 again changes state and conversely Line d of FIG 3 shows the shape of the resultant pulses which are applied to the electromagnets 29 when the operating time of the multivibrator 32 is long and the switch 25 is connected to the output A Line e of FIG 3 is the relatively complementary state when the switch 25 takes the output from output A In this mode of operation the automatic reset of the multivibrator 32 after a few seconds prevents the ener gized electromagnet 29 from remaining in the ener gized state for too long of a time as might occur if the carriage 13 were left in a stationary position with the reading head 16 aligned with the data carrier 14 It
25. ystem for a knitting machine which per mits the simplest possible data carrier to be used and which nevertheless insures a precise transmission of the pattern code to the data storage dial 5 20 25 30 35 40 45 50 55 2 In order to achieve the foregoing object in accor dance with this invention it is proposed to provide a system comprising a reading head which scans the data carrier without contacting the data carrier and interval pulse generator which generates an interval pulse each time the carriage has traversed a distance egual to the spacing of neighboring needles and a reading head connected to a gating circuit which transmits a signal or signal changes corresponding to the output signals of the reading head only in the presence of an interval sig nal According to the invention the data carrier is lo cated alongside the needle bed and is directly scanned by the reading head on the carriage when the carriage traverses the data carrier The data carrier does not therefore serve for mechanically displacing pins which in turn cooperate with the traversing carriage The original data carrier is directly scanned noisily and without coming into contact with the scanning means Consequently there is substantially no wear The inter val signals insure that the individual pattern points are read only at specified times namely when the reading head is in the center above a pattern point Uncer tainity r
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