Paper tray adjustment page
Contents
1. It should also be appreciated that the discussed invention aligns every page that prints through the printing device That is there is no need to print documents through a special application or program For example a file printed from MS Word can have the discussed tray alignment performed on it An operator doesn t need to use any type of measuring device to align a tray because the tray alignment sheet is folded in half and the ruler is obsolete because the center of the sheet is known The exact center of a page is determined through mea surements taken on the outskirts of the sheet in the following manner Each point on an imaginary line across the sheet is known and a remaining point on an adjacent edge of the sheet connects to an imaginary point at a right angle the exact center of the sheet is known If every image is printed to this exact center the issue of alignment known in the art as Top Top and Top Bottom duplexing is eliminated Both versions of duplexing print to the center of the sheet thereby eliminating the need to fumble with rotation of the print of origin Tray Alignment Usage The preferred embodiment of the invention provides an apparatus for performing tray alignment to correct for out putting inadequacies in an output device and is described with reference to FIG 2 FIG 2 is a block diagram of an example of an apparatus for performing tray alignment for at least one paper feeding mechanism 2002. duplex then the end user sets the duplex checkbox 321 to choose a single sided or double sided alignment calibration page and then selects the Print button 322 A single sided or double sided alignment cali bration page depending on checkbox 321 status is printed using a sheet from the tray selected under Select Tray 310 Step 3 Enter Alignment Values The end user obtains and subsequently enters calibration alignment values that the workstation uses to determine how much the image needs to be shifted and rotated on the page to print properly Following is a preferred way for the end user to obtain tray alignment values Retrieving printed tray alignment calibration page Carefully folding page in half vertically and in half horizontally determining where folds fall on the graphs on page and transcribing values taken from scales into corresponding input boxes next to each scale Repeating preceding operation for duplex option if appli cable and Transferring values written on calibration page to text boxes A B and C 331 under Enter alignment values section 330 If the Print Duplex checkbox 321 is enabled from the Print Alignment Page section 320 then also entering duplex values under the Side 2 section 332 of the Enter alignment values section 330 It should be appreciated that selecting the Defaults Button 333 causes alignment values to be set to default or initial values In the preferred embodiment the default value i
3. factor is s XscaleLength XscaleLength Similarly if the vertical scaling mark is expected to measure YscaleLength but actually measures YscaleLength on the printed page the desired vertical scaling factor is s YscaleLength YscaleLength It should be appreciated that every measurement on the printed tray alignment page integrates these scaling factors above Therefore herein this document scaling factors of 1 0 no scaling required is assumed to simplify equations To calculate the plane rotation angle the end user folds the tray alignment sheet horizontally in half to produce a fold line 109 passing by the vertical center of the actual sheet This horizontal fold line 109 crosses the vertical scales A 103 and C 105 at UserReadingA written in box A 111 and UserReadingC written in box C 112 Using equa tions presented earlier points UserReadingA and UserRead ingC have the following y coordinates in user plane YuserReadinga F y UserReadingA YuserReadingc F UserReadingC Due to translation and rotation transforms UserReadingA and UserReadingC points end up at the vertical center of the actual page the device plane When there is no error due to plane rotation then YuserReadingA Y UserReadingc In other words the difference between YuserReadinga and YuserReadingc 18 due to plane rotation The angle for plane rotation is evaluated by figuring a right triangle from points UserReadingA UserReadingC and
4. properly The following should be appreciated about the preferred embodiment of the invention Applied alignment calibration values replace any existing alignment calibration values Alignment calibration values are stored as each tray is calibrated When a previously calibrated page size is used on a tray it is not required to apply the calibration Previously set alignment calibration values are ignored when printing the alignment calibration page The preferred embodiment of the invention stores the following data to ensure that tray alignment is performed properly Alignment calibration values are stored whenever an alignment calibration is performed Unique calibration values are stored for each tray media size Tray media type combinations that have not been cali brated are set to initial values and Data stored for each tray includes Top side calibration values Bottom side or duplex calibration values and Date of last alignment calibration where if calibration has not been performed then the date and time have default values Tray Alignment User Interface The preferred embodiment provides a user interface for performing tray alignment Tray alignment can be per formed using various input mechanisms such as but not limited to a workstation a LCD panel and a custom print driver interface As an example of an input mechanism for a workstation in the preferred embodiment of the invention an end user can open a
5. a United States Patent US006550991B2 10 Patent No US 6 550 991 B2 Michel et al 45 Date of Patent Apr 22 2003 54 PAPER TRAY ADJUSTMENT PAGE 5 379 101 A 1 1995 Takahashi et al 355 309 5 391 009 A 2 1995 Stodder vv 400 605 75 Inventors Paul Michel Redwood City CA US 5 532 847 A 7 1996 Maruyama 358 498 Bradley Pirman Pacifica CA US 5 775 684 A 7 1998 Jackson et al 271 9 07 i 5 813 771 A 12 1998 Ur et al i i 6 118 950 A 9 2000 Wibbels et al 399 16 73 Assignee Electronics for Imaging Inc Foster iii City CA US 6 367 996 B1 4 2002 Edwards 400 279 FOREIGN PATENT DOCUMENTS Notice Subject to any disclaimer the term of this patent is extended or adjusted under 35 a oe i a jee U S C 154 b by days EP 0911700 A2 4 1999 JP 08088713 4 1996 21 Appl No 09 814 455 OTHER PUBLICATIONS 22 Filed Mar 22 2001 HP Makes an Even Better Impression BYTE vol 23 No 65 Prior Publication Data 2 p 129 Feb 1998 US 2002 0136579 A1 Sep 26 2002 E Impression PC User No 211 p 71 May 19 Jun 51 E E E E B41J 11 44 Lasers on Stun PC User May 20 Jun 2 1992 52 USe CL u aaa mash 400 70 399 16 400 582 Automatic Duplex Copier IBM Technical Disclosure Bul 400 583 3 letin vol 22 No 4 p 1379 1381 58 Field of Search 400 70 76 61 Seed eee 400 578 582 279 583 3 399 16 y Primary Ex
6. a line drawn perpendicularly from BarA 103 to BarC 105 Three values are required to solve a triangle They are DistanceAC x x DeltaY y UserReadingA UserReadingC 90 right angle between the vertical graduated bars and the vir tual line from point A to C Following is the equation to evaluate the amount of rotation to be applied between planes 0 tan 1 DeltaY DistanceAC To calculate plane translation values the end user folds the tray alignment sheet vertically in half to produce a fold line 110 passing by the vertical center of the actual sheet This vertical fold line 110 crosses the horizontal scale B 104 at UserReadingB written in box B 113 Using the equations for plane rotation presented earlier and the rotation angle 0 just measured the x coordinate of UserReadingB and the y US 6 550 991 B2 7 coordinate of UserReadingC in the rotated plane before translation can be evaluated by 2 X UserReadingB X UserReadingB COS 0 ys sin 0 3 a I Y UserReadingC Xc SiN O VuserReadingc COS 0 Using equations for plane translation presented earlier with X UserReadingB and Y UserReadingC just calculated it is possible to evaluate how much translation needs to be applied between planes y peat L X UserReadingB XB LY tsei Reading YC It should be appreciated that the discussion above can be generalized not to use an end user but can be performed more broadly such as be automated for example
7. aminer Charles H Nolan Jr 56 References Cited U S PATENT DOCUMENTS 4 610 445 A 9 1986 4 662 765 A 51987 4 831 420 A 5 1989 5 046 714 A 9 1991 5 091 654 A 2 1992 5 120 040 A 6 1992 5 277 418 A 1 1994 109 X Schneider et al 271 160 Kapp et al 400 595 Walsh et al 271 226 Hwang nee nen niaes 271 162 Coy et al 250 559 29 WEY enpas 271 9 Jones et al 271 164 Tray Alignment Page 57 ABSTRACT Atray alignment calibration page and method and apparatus using the page are provided The page has graduated scales along horizontal and vertical edges such that the scale values are enterable into an interface to align an image to be printed centered on a target page 1 Claim 3 Drawing Sheets 100 Directions 1 Fold the sheet in half horizontally Then open the sheet 110 fo Fold the sheet in half vertically Then open the sheet again Determine where the folds cross each scale Write each number in the box next to each scale 105 C 3 E 2 108 2 Optional only for printers having scaling errors Measure length of X and Y scales Write measurements in the box next to each scale scale B 113 107 104 0 5 1015 20 2530354045 50 US 6 550 991 B2 Sheet 1 of 3 Apr 22 2003 U S Patent 0G SOP SE OSZ OC SLOL S 0 401 TT EH D9S YODe o x u XOq y u szu w nsp w M S D9S puo x J
8. associated with a media type 201 and associated with an output device 202 An end user uses an input means 203 such as for example an LCD panel to specify which tray is to be aligned and which media type to use FIG 2 shows one tray 200 to be aligned and one media type 201 within the tray In this example through input means 203 media type 201 and specific tray 200 are specified in outputting an tray align ment calibration page 204 The alignment calibration page 204 comprises markings that are used to determine align ment calibration values The preferred tray alignment cali bration page is discussed above Measured calibration parameters are entered into input means 203 whereby calibration values are determined and are subsequently applied to outputs The preferred embodiment of the invention provides the following technique for performing tray alignment on an output device Specifying a tray to be aligned taking into account whether or not a duplexing unit is attached to the device Printing a tray alignment calibration page If a duplexing unit is attached the alignment calibration page is optionally double sided 10 15 20 25 30 35 40 45 50 55 60 65 8 Determining alignment calibration values using the align ment calibration page and entering such values in a tray alignment dialog and Applying the calibration values and printing a test page to show that the alignment calibration worked
9. ccessful and selects OK to return to the LCD Functions menu The Restore Defaults option restores the default tray alignment calibration values as described below At a Select Tray LCD screen the end user selects a tray number using select buttons then selects OK and At a Restore Defaults for Tray Name LCD screen the end user selects Yes to restore default values and then selects OK to return to the LCD Functions menu An equally preferred embodiment of the invention uses a custom print driver interface also referred to interchange ably herein as a unidriver For example a unidriver interface can provide a paper source header under which an Enable Tray Alignment checkbox is provided It should be appreciated that additional features as well as suggested enhancements can be added to the invention claimed herein without deviating from the scope and spirit of the invention Two such examples are duplex auto sensing for two sided calibration and applying required changes independently from a printer s programming lan guage Accordingly although the invention has been described in detail with reference to particular preferred embodiments persons possessing ordinary skill in the art to which this invention pertains will appreciate that various modifications and enhancements may be made without departing from the spirit and scope of the claims that follow What is claimed is 1 A method for performing paper tray alignment in a p
10. ccurate registration which is the precise positioning of printed elements Ensur ing accurate registration is important especially when print ing duplex pages i e both sides of pages The locations of elements to be printed on a page are typically described in Cartesian coordinates When printing such elements on a page the elements may end up with different coordinates than intended for the actual printed page and sometimes such elements are printed smaller or larger than expected Such problems arise for example when a medium such as a page feeding mechanism or drawing device is not precisely calibrated or when the medium is stretched Another problem is that sometimes impressions are skewed Skewed impressions may happen for instance when paper trays paper feeding mechanisms and drawing devices are not parallel Yet another problem is that positions of printed elements are sometimes shifted for example towards the left right top and or bottom of a page Corrections to shifted elements are taught in Splash M Series User s Manual Version 1 0 Sep 22 1998 A Splash M Series Configuration disk supports two page positioning configuration parameters in a DP INI file sshift and fshift These parameters allow adjusting the position of an image with respect to the center of the page The image can be repositioned in all four directions up down right and left sshift adjusts the center of the page along an S axis slow sca
11. ent is needed for calcu lating parameters for plane rotation and translation US 6 550 991 B2 5 It should also be appreciated that when using tray align ment page 100 only a ruler is needed for calculating the scaling factor parameters The preferred embodiment of the invention has both user and device planes with origins in the lower left corner of the tray alignment page X increases to the right and Y increases upwards The dimensions of the tray alignment page are PageWidth wide by PageHeight high Ascaling mark 101 is drawn parallel to horizontal edges of the page The scaling mark 101 has length XscaleLength written in box Xscale 114 A scaling mark 102 is drawn parallel to vertical edges of the page its length is YscaleLength written in box Yscale 115 It should be appreciated that when a printer consistently delivers proportional scaling only one scale measurement is required and when a printer consistently delivers scaling factors of 100 then no scaling marks are required The tray alignment page comprises graduated bars BarA BarB and BarC 103 104 105 respectively that are parallel to the page edges For attaining accuracy these bars are located as close as practical to the page edges The distance between each bar and its closest edge is Distance FromEdge The distance between each graduation on a bar is DistanceBetweenTicks The length of a bar is BarLength Point A 106 is located at the center of BarA P
12. es an image to be printed on a page to correct for the paper tray s physical inadequacies The tray align ment technique discussed herein works seamlessly with workstations LCD panels and other applications A tray alignment calibration page and method and appa ratus using the page are provided The page is printable using an alignment dialog box The page has graduated scales with values running along the horizontal and vertical edges An end user folds the page in half horizontally and vertically to locate the center of the page The end user also obtains other values such as scaling factors from the page Such values are enterable as correction values into the alignment dialog to align an image to be printed on a target page so that printing occurs centered on the page A set of input image Cartesian coordinates is mapped to output device Cartesian coordinates taking into account scaling rotational and translation factors The invention handles duplex printing as well It should be appreciated that the discussed invention herein is not limited to printing devices but relates to any outputting device involving outputting an image To print elements on a page locations of such elements are usually supplied using Cartesian coordinates For vari ous reasons these elements may end up at different coordi nates on the actual printed page The invention discussed herein measures the disparities in the coordinates and com pensating f
13. n LCD functions menu The Align Trays option provides the following At a Align Tray LCD screen the end user selects a tray number using select buttons then selects OK At a Paper Size LCD screen the end user selects a media size then selects OK 5 10 15 20 25 30 35 40 45 50 55 60 65 10 If duplexing is installed the Align Tray for Duplex Print ing LCD screen is shown The end user selects Yes to run tray alignment calibration for duplex then selects OK Selecting No returns the end user to the Tray Alignment LCD menu At a Print Alignment Page option the end user selects Yes to print the tray alignment calibration page The align ment calibration page prints uses the tray selected at the Align Tray LCD screen Next the end user enters alignment values for side one of the page under Side 1 Alignment Value A B amp C respectively LCD screens If an alignment calibration page for duplex is printed then the end user enters calibration values under Side 2 Alignment Value A B amp C respectively LCD screens At an Apply Alignment Values LCD screen the end user selects Yes to apply the alignment calibration values to the selected tray Selecting No returns the end user to the Tray Alignment LCD menu without applying align ment calibration values and At a Check Alignment LCD screen the end user selects Yes to print a test page to demonstrate that the align ment calibration was su
14. n axis and fshift adjusts the center of the page along an F axis fast scan axis The orientation of each of the S and F axes is dependent on the direction the paper is being pulled through the printer The Splash technique is limited in correcting problems in shifting It would be advantageous to provide methods and appa ratus to shift rotate and scale images to be printed on a page thereby correcting for a paper tray s physical inad equacies It would be advantageous to provide methods and appa ratus for paper tray adjustments that work with other devices such as for example workstations and LCD panels and with other applications It would be advantageous to provide methods and appa ratus to calculate parameters for plane rotation and transla tion by using a test pattern and whereby the use of any instrument for measuring is not required It would be advantageous to provide methods and appa ratus to calculate a scaling factor parameter and whereby only a ruler is needed SUMMARY OF THE INVENTION A tray alignment calibration page and method and appa ratus using the page are provided The page is printable 10 15 20 25 30 35 40 45 50 55 60 65 2 using an alignment dialog box The page has graduated scales with values running along the horizontal and vertical edges An end user folds the page in half horizontally and vertically to locate the center of the page The end user also obtai
15. ns other values such as scaling factors from the page Such values are enterable as correction values into the alignment dialog to align an image to be printed on a target page so that printing occurs centered on the page A set of input image Cartesian coordinates is mapped to output device Cartesian coordinates taking into account scaling rotational and translation factors The invention handles duplex printing as well BRIEF DESCRIPTION OF THE DRAWINGS FIG 1 is a schematic diagram showing a tray alignment calibration page whereby alignment values can be obtained from scales according to the invention and FIG 2 is a block diagram of an apparatus for performing tray alignment for at least one tray associated with a media size and associated with an output device to correct for outputting inadequacies in the output device system accord ing to the invention and FIG 3 is a screen print of an example of a tray alignment dialog box for duplex printing according to the invention DETAILED DESCRIPTION OF THE INVENTION When a new printer is configured many features and pieces of equipment of the printer need to be set up and adjusted Paper trays are no exception For example a technician could spend several minutes skewing and shifting the paper trays of a printer to ensure accurate registration when printing duplex pages where registration means the alignment of a page in a paper tray The discussed invention shifts and rotat
16. nto coordi nates for a device plane and Optionally printing a verification page to confirm accu racy of the corrective adjustment It should be appreciated that the phrases test pattern and tray alignment calibration page are used interchangeably herein The preferred embodiment of the invention uses standard mathematical equations for coordinate systems substitutions or transforms Such equations are available in many geom etry books One such reference is CRC Standard Math ematical Tables and Formulae 30 edition 1996 CRC Press The coordinate system substitution equations used in the preferred embodiment are described below 10 15 20 25 30 35 40 45 50 55 60 65 4 When two planes have the same origin equations for change of coordinates by plane scaling are CRC page 265 x ax where a 0 is the horizontal scaling factor y by where b 0 is the vertical scaling factor When a b scaling is proportional when a b 1 there is no need for compensation for plane scaling When two planes have the same origin and the positive x axis results from a counterclockwise rotation of the positive x axis by an angle 0 equations for change of coordinates by a rotation are CRC page 253 x x cos y sin 0 y x sin 0 y cos 0 When 0 0 there is no need for compensation for plane rotation When two planes have axes where x is parallel to x and y is parallel to y and the origin of the
17. o u j sinspey s4os4se Buljpos Bu apu si ljulid 40 Ajuo DU01 dO D59s uop ol x u XOq y ul J qunu yoda l1lA D9Ss uop 801 SSOJD Sp O y 48uA_ ulul l Qq m uipBo ys y u do u ul 9 JID91149A JIDY u j us ay ploj4 jaays ay u do usu AlJD UOZ 4OY jjo u j us y Ploy SUO 9941 eBpy juewuBljy Ads a Q DOS X zol GH uu gjpos A U S Patent Apr 22 2003 Sheet 2 of 3 US 6 550 991 B2 202 FIG 2 U S Patent Apr 22 2003 Sheet 3 of 3 US 6 550 991 B2 Paper Tray Alignment 300 1 Select Tray 311 Last alignment 1 1 90 8 00 00 AM 2 Print alignment page 320 C Print Duplex BBS 390 321 3 Enter alignment values 331 aJ 4 Apply alignment values 332 340 Check Alignment US 6 550 991 B2 1 PAPER TRAY ADJUSTMENT PAGE BACKGROUND OF THE INVENTION 1 Technical Field The invention relates to paper alignment for printing devices More particularly the invention relates to methods and apparatus for performing paper tray alignment using an alignment calibration page to determine and apply alignment calibration values 2 Description of the Prior Art When a new printer is configured many features and pieces of equipment on the printer need to be set up and adjusted Paper trays are no exception For example a technician could spend several minutes skewing and shifting the paper trays of a printer to ensure a
18. oint B 107 is located at the center of BarB and Point C 108 is located at the center of BarC Following are expected coordinates when every element is precisely located where specified in the user plane as follows x DistanceFromEdge x Page Width 2 middle of the page horizontally X Page Width DistanceFromEdge y PageHeight 2 middle of the page vertically y z DistanceFromEdge y PageHeight 2 middle of the page horizontally Same as y4 Readings on horizontal bar B 104 are converted into user plane coordinate x by the following equation x F Readings where F Readings x ScaleLength 2 Reading xDistanceBe tweenTicks Similarly readings on vertical bars A 103 and C 105 are converted into user plane coordinate y with the following equations y F Reading where F Reading y ScaleLength 2 Reading xDistanceBe tweenTicks and F Reading y ScaleLength 2 Reading xDistanceBe tweenTicks 10 15 20 25 30 35 40 45 50 55 60 65 6 The preferred embodiment of the invention calculates the following factors in the order shown below Plane scaling factors s s Plane rotation angle 6 and Plane translation values t t That is an end user evaluates scaling factors first If the horizontal scaling mark is expected to measure Xscale Length but actually measures XscaleLength on the printed page then the desired horizontal scaling
19. or such differences The preferred embodiment of the invention refers to the plane of user requested coordinates as a user plane and the plane of printer delivered coordinates as a device plane The user plane represents a theoretical page as seen by for US 6 550 991 B2 3 example a graphic designer while the device plane repre sents an actual sheet as delivered by a printing device The preferred embodiment of the invention describes how to measure disparities and to compensate for differences between user and device planes As an example of measur ing such disparities and compensating for such differences between the user and device planes the preferred embodi ment of the invention uses scaling rotational and translation factors The discussed invention interprets the disparities by measuring scaling rotational and translation parameters and thereby compensates for the differences by applying the measured parameters to scaling rotational and translation standard corrective functions or transforms Plane scaling can be used for example when printed elements are smaller or larger than expected This may happen for instance when the medium feeding mechanism or the drawing device is not precisely calibrated or when the medium is stretched Such disparities can be corrected by a transform using plane scaling Plane rotation can be used for example when impres sions are skewed This may happen for instance when pape
20. r trays paper feeding mechanisms or drawing devices are not parallel Skew can be corrected by a transform using plane rotation Plane translation can be used for example when posi tions of printed elements are shifted towards the left or the right of a page or towards the top or bottom of the page Shifts in any possible combination of directions can be corrected by a transform using plane translation One targeted use for the preferred embodiment of the invention is electronically adjusting paper trays by filtering the size angle and location of page elements to ultimately locate such elements at an intended position by for example a designer on the printed page This technique is useful especially for two sided duplex printing By adjusting independently the source paper tray and the duplex paper tray or duplex mechanism images on both sides appear properly aligned The preferred embodiment of the invention provides the following procedure for using a test pattern to measure disparities and to compensate for the differences as dis cussed above Printing a test pattern on one side of a page Measuring the test pattern Calculating parameters for corrections such as for example scaling factors rotation angle and translation values and using the calculated parameters in compen sation functions previously installed in the printing system Such compensation functions transform incoming coordinates from a user plane i
21. rinting device the method comprising printing a test pattern on a first side of a page the test pattern comprising a first graduated bar that is parallel to a first edge of the page a second graduated bar that is parallel to a second edge of the page and a third graduated bar that is parallel to a third edge of the page folding the page in half to produce a first fold line at the center of the first edge of the page reopening the page folding the page in half to produce a second fold line at the center of the second and third edges of the page US 6 550 991 B2 11 12 reopening the page calculating a plane rotation angle based on the second and determining a first location where the first fold line third locations and crosses the first graduated bar a second location where calculating a plane translation value based on the plane the second fold line crosses the second graduated bar rotation angle and the first and third locations and a third location where the second fold line crosses 5 the third graduated bar a ae RO amp
22. s the midpoint of the scale and in the example is equal to 25 When the Defaults Button 333 is selected a Yes No dialog appears asking the end user Do you wish set the default tray alignment values for the current tray or for all trays Setting the default values for all trays will cause all currently stored tray alignment calibration values to be replaced Step 4 Apply Once all alignment calibration values have been correctly entered under Enter Alignment Values 330 331 the end user selects an Apply button 341 from the Apply alignment values section 340 At this point newly entered alignment calibration values replace any previously existing alignment calibration values Clicking the Check Alignment button 342 causes a test page to be printed using the input calibration values It should be appreciated that in this example if the Apply button 341 is clicked then clicking the Check Alignment button 342 causes the calibration values to be applied automatically The end user selects the Done button 301 to close the Tray Alignment dialog box and end the procedure Another equally preferred embodiment on the invention allows uses LCD panels As an example an end user opens a LCD functions menu and selects a Tray Alignment menu The Tray Alignment menu has three options Exit Tray Alignment Align Trays and Restore Defaults as described below The Exit Tray Alignment option exits the tray alignment LCD menu and returns to a
23. second plane coincides with the point xo yo of the first plane equations for change of coordinates by plane translation are CRC page 253 X X Xp and Y V Yo When xo yo X o y o there is no need for compensation for plane translation These transforms can easily be combined into simple linear equations The preferred embodiment of the invention comprises determining and applying the parameters discussed above in a specific sequence of operations or transforms The opera tions are called at the beginning of printing a new page to position images on the page where a designer wants them As a practical example the PostScript language offers the following operators presented here in the order that they must be applied tt translate 0 rotate and S S scale The preferred embodiment of the invention comprises a tray alignment page equally referred to as test pattern and using the tray alignment page for gathering data to deter mine scaling rotational and translation factors for perform ing the corrective transformations or alignments of elements on a page The Tray Alignment Page The preferred tray alignment page is described below and with reference to FIG 1 FIG 1 is a schematic diagram showing the preferred tray alignment calibration page whereby alignment values can be obtained from scales according to the invention It should be appreciated that when using tray alignment page 100 no measurement instrum
24. tray alignment dialog box through a menu option such as for example a Server gt Tray Alignment menu option Such option opens a tray alignment dialog box For an example of a tray alignment dialog box refer to FIG 3 FIG 3 is a screen print of an example of a tray alignment dialog box for duplex printing The tray alignment dialog 300 separates tray alignment action for a single paper tray into a series of four steps described below It should be appreciated that when such tray alignment dialog box opens previous alignment calibration values are automatically displayed under an Enter alignment values section 310 Step 1 Select Tray An end user selects a paper tray to be calibrated and a media size Trays in pull down list 311 are dependent upon the corresponding output device The media sizes available 312 are also dependent upon the output device The date and time of the last tray alignment calibration 313 is also shown under Select Tray 310 At initial alignment the date and time shown are default values Step 2 Print Alignment Page The end user chooses to print an alignment calibration page 320 If the output device is enabled for duplex printing a checkbox is available for Print Duplex 321 If the output device is non duplex then the end user selects Print button 322 A single sided tray alignment calibration page is printed to the tray selected under Select Tray 310 US 6 550 991 B2 9 If the output device is
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