WO2005040937A1 - Procede et dispositif pour corriger le retrecissement du papier - Google Patents

Procede et dispositif pour corriger le retrecissement du papier Download PDF

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Publication number
WO2005040937A1
WO2005040937A1 PCT/EP2004/009660 EP2004009660W WO2005040937A1 WO 2005040937 A1 WO2005040937 A1 WO 2005040937A1 EP 2004009660 W EP2004009660 W EP 2004009660W WO 2005040937 A1 WO2005040937 A1 WO 2005040937A1
Authority
WO
WIPO (PCT)
Prior art keywords
printing
toner image
line
recording medium
image
Prior art date
Application number
PCT/EP2004/009660
Other languages
German (de)
English (en)
Inventor
Peter Thiemann
Herbert Gibisch
Dieter JÖRGENS
Original Assignee
Oce Printing Systems Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oce Printing Systems Gmbh filed Critical Oce Printing Systems Gmbh
Priority to DE202004020953U priority Critical patent/DE202004020953U1/de
Publication of WO2005040937A1 publication Critical patent/WO2005040937A1/fr

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5095—Matching the image with the size of the copy material, e.g. by calculating the magnification or selecting the adequate copy material size
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00919—Special copy medium handling apparatus
    • G03G2215/00949—Copy material feeding speed switched according to current mode of the apparatus, e.g. colour mode

Definitions

  • the invention relates to a method and a device for printing on a recording medium, in which a recording medium is printed with a first toner image by a printing device in a first printing process, the first toner image is fixed on the recording medium in a fixing device, the recording medium at least lengthways a main axis shrinks, and in which the same recording medium is then printed with a second toner image in a second printing process.
  • shrinkage in the direction of a major axis can be up to 1%, i.e. in the case of a sheet of size DIN A4, the shrinkage in the longitudinal direction can be more than 2 mm. The effect becomes even clearer with larger formats.
  • a method for operating a printer with two printing units is known from WO 98/18054 by the same applicant, in which different operating modes can be implemented.
  • a duplex printing operation single sheets are printed on both sides, with a fixation taking place between the respective printing process.
  • Another mode of operation is two-color simplex printing, in which two image patterns of different colors are printed on the front of a single sheet. This operating mode is also known as highlight color printing.
  • Another mode of operation is two-color duplex printing, in which the front and the back of an egg leaf are printed with image patterns of different colors.
  • EP 0 699 315 AI discloses an electrographic printing device for printing on tape-shaped recording media with different bandwidths.
  • a paper tape is transported and printed on a single printing unit with a usable width of at least twice the width of the paper tape in side by side -: - position.
  • the first toner image is temporarily fixed, one
  • the second toner image is applied to the recording medium in a compressed form in the direction of the main axis in a second printing process.
  • the compression corresponds approximately to the degree of shrinkage in the direction of this main axis. If the recording medium, generally paper, then expands again under normal climatic conditions, the second toner image in the direction of this main axis has the same extent as the first toner image, whereby the shrinkage effect is compensated for.
  • a device for printing on a recording medium is specified. This device enables compensation of the shrinkage effect.
  • FIG. 1 shows a single-sheet printing system with two printing units and two fixing stations
  • FIG. 2 shows the printing system according to FIG. 1 in the duplex printing mode
  • FIG. 3 shows a printing system for tape-like paper that is printed twice
  • FIG. 4 shows an arrangement with an LED character generator
  • FIG. 5 shows an arrangement with compensation optics to compensate for paper shrinkage.
  • Figure 6 shows an arrangement with an optical pre-distortion and an optical post-distortion to compensate for the paper shrinkage.
  • the high-performance printer 10 is used for the rapid printing of single sheets of paper and contains a first printing unit D1 and a second printing unit D2. Both printing units D1, D2 work according to the known electrographic process.
  • the printing units D1, D2 are each followed by fixing stations 12, 14, which are indicated schematically by two pairs of rollers.
  • To the high-performance printer 10 is one Paper input 16 connected, which contains a plurality of storage containers 18 to 24 with single sheets and an external paper input channel 26. Single sheets are fed to an input section 28 via a transport channel 27.
  • a paper output 30 is connected to the high-performance printer 10, • a plurality of output receptacles contains 32 to 36.
  • two output channels 38, 40 are provided, via which single sheets can be output at further processing stations.
  • the high-performance printer 10 delivers the printed single sheets via the output section 42.
  • Transport paths for the transport of the single sheets are arranged in the interior of the high-performance printer 10, through which different operating modes of the high-performance printer are realized.
  • the printing units D1, D2 are each assigned transfer printing transport paths 44, 46, which are each set by drives in such a way that the individual sheets fed to the printing units D1, D2 have their transfer printing speed.
  • Both transfer printing transport paths 44, 46 are connected to one another via a connecting channel 48.
  • the transport path around the first printing unit D1 is supplemented to form a ring by a feed channel 50, via which individual sheets can also be fed from the input section 28 to the second transfer printing transport path 46.
  • the transport path for the second printing unit D2 is similarly supplemented to form a ring by a discharge channel 52, via which individual sheets printed by the printing unit D1 can be fed to the output section 42.
  • a first switch W1 is arranged between the input section 28, the first transfer printing path 44 and the feed channel 50, which enables individual sheets from the input section 28 to be optionally fed to the first transfer printing path 44 or the feed channel 50.
  • a further variant consists in that W1 was transported on the feed channel 50 in the direction of the first switch Single sheets can be fed to the first transfer printing transport path 44.
  • a second switch W2 and a third switch W3 are arranged at the ends of the connecting channel 48 and connect the adjacent transport paths 44, 48, 52 and 46, 48, 50, respectively.
  • a fourth switch W4 is located in the vicinity of the delivery section 42 and connects the adjacent transport routes.
  • the paper output 30 contains a fifth switch W5, which works as a turning device. Furthermore, it should also be pointed out to a control device 54, to which reject single sheets are fed via a switch W6.
  • FIG. 2 shows schematically the duplex printing operation in which the single sheets are printed on both sides.
  • the single sheets fed to the input section 28 are fed to the first transfer printing path 44 through the first switch W1 (arrow P13).
  • the respective single sheet is conveyed a turning distance according to the arrow P14 beyond the switch W2.
  • This turning path is part of the discharge channel 52.
  • the conveying device is then reversed according to arrow Pl5, and the switch W2 then guides the single sheet according to the arrow P16 into the connecting channel 48.
  • the single sheet is then from the switch W3 in the direction of the arrow P17 to the second Transfer printing path 46 deflected.
  • the printing unit D2 is therefore the not yet printed back of the single sheet fed for printing.
  • This single sheet has shrunk due to the fixation process.
  • a new fixing process follows in the fixing station 14 with the application of heat and pressure.
  • the successive single sheets are then fed to the switch W4 according to the arrow P18 - and transported into the paper output 30 along the arrow P19.
  • the W5 switch serves this purpose.
  • the single sheet is first guided through the switch W5 in the direction of arrow P20 for a predetermined turning distance.
  • the transport Richting according to arrow P21 is reversed and the shunt W5 conveys the sheet in the direction of arrow -P22, whereupon it is placed true to side in the stackers 32 to.
  • Another mode is the two-color simplex printing, often referred to as highlight color printing, in which the front side of a single sheet with two image patterns of different color is printed. "The two printing units Dl, D2 then print image patterns of different colors.
  • the single sheet is fed to the printing unit D1 via the switch W1, printed, and fixed for the first time, with shrinkage occurring in the fixing station 12. Then the single sheet is connected to the connecting channel 48 without turning and then via the switch W3 to the printing unit
  • the printing unit D2 prints the shrinked front side with a color different from the color of the printing unit D.
  • the single sheet is fixed a second time in the fixing station 14 and output to the paper output 30 via the switch W4 , in which the printing unit D2 prints first and after fixing the printing unit Dl d Print the second toner image:.
  • Another operating mode with intermediate fixation is two-color duplex printing, in which the front and the back of a single sheet are printed with image samples of different colors. The prerequisite for this is that the printing units D1 and D2 print differently colored print images.
  • the two-color printing on the front is carried out in the same way as in the two-color simplex printing mode described above. First, the single sheet is printed in two colors on one side with the printing units Dl and D2.
  • the single sheet is again fed to the printing unit Dl via the channel 48 and the switch Wl and W6 for printing on the back. So that this back side is fed to the printing unit Dl, the single sheet must be turned on the transport path between the printing unit D2 and the printing unit Dl. This turning can take place, for example, on the switch W4, the switch W2 or the switch W3. The second color is then printed on the printing unit D2 on the back of the single sheet.
  • the individual sheet may experience different shrinkages during the various fixing processes.
  • FIG. 3 shows a further example of a high-performance printing system 58 which works with a band-shaped carrier material 60. Sections of the carrier material 60 are guided twice past a photoconductor drum 68 with at least twice the width of the tape material and printed, with an intermediate fixation taking place with the inevitable shrinking process.
  • the various units for the electrophotographic process are grouped around the photoconductor drum 61.
  • Charging the intermediate carrier 61 which acts as a photoconductor drum is trained; an LED character generator 63 with a light-emitting diode comb for character-dependent exposure of the intermediate carrier 61, which extends over the entire usable width of the intermediate carrier 61; a developer station 64 for coloring the character-dependent charge image on the intermediate carrier 61 using a one- or two-component developer mixture; a transfer printing station 65, which extends over the width of the intermediate carrier 61 and with which the toner images are transferred to the recording medium 61.
  • a cleaning station 66 is provided, with an integrated cleaning brush with associated suction device and a discharge device 67 .
  • the intermediate carrier 61 is driven by an electric motor and moved in the direction of the arrow in the printing mode.
  • a stacking device 72 serve for the recording medium 60.
  • the fusing station shown other fusing stations are also possible, for example with a heated or unheated inlet saddle.
  • the tape-shaped recording medium 60 is made up, for example, as prefolded continuous paper provided with edge perforations and is fed from a storage area 73 via feed rollers 74 to the transfer station. It is also possible to feed a recording medium without edge perforations in this way or via a roll feed.
  • the recording medium 60 is preferably transported via a transport device 75 assigned to the transfer printing station 65 in the form of pins Conveyor belts which, guided via drive shafts 77, engage in the perforations on the edge of the recording medium 60.
  • a transport-hole-free recording medium an adapted transport device familiar to the person skilled in the art is to be provided, which transports the recording medium, for example by friction, controlled by a control arrangement scanning synchronization marks.
  • a deflection device 78 is arranged in the housing area of the printing device between the storage area 73 and the fixing station 68, via which the recording medium 60 is returned from the fixing station 68 to the transfer printing station 65. .-
  • the electrographic printing device is suitable for printing on • recording media of different bandwidths.
  • the fuser 68 and. the other electrophotographic units, such as developer station 64, character generator 63, cleaning station 66, are designed in accordance with this usable width.
  • Adapting the width of the character generator 63 to different recording medium widths does not require any mechanical change to the character generator if, as in this case, an LED character generator is used with a large number of LEDs arranged in rows.
  • An adaptation to the recording medium width used is done electronically by control.
  • the deflection device 78 arranged in a return channel for narrow recording media from the fixing station to the transfer printing station has two functions: running operation for laterally displacing the recording medium web and in turning operation for rotating the back of the recording medium 60 from the rear. It is designed to be switchable depending on the operating mode.
  • the narrow, for example DIN A4-wide, recording medium 60 is fed from the supply area 73 via the feed rollers 74 to the transfer station 65 and on its upper side printed with a front toner image.
  • the front side of the recording medium 60 is identified by solid transport arrows, the underside by dashed transport arrows. Thereafter, the recording medium 60 with the front toner image is fed to the fixing station 68 - and. the front-side toner image is fixed, whereby the recording medium 60 shrinks.
  • Each position area of the narrow recording medium 60 is a corresponding developer zone E1 or E2 on the intermediate carrier 61 as it passes through the transfer printing station 65 assigned.
  • two developer stations 64/1 and 64/2 arranged one behind the other can be assigned to the developer zones.
  • the developer station 64/1 contains a toner mixture of a first color, for example red and the developer station 64/2 contains an developer in a second color, for example black.
  • the developer stations 64/1 and 64/2 are designed so that they can be activated separately with respect to the developer zones El and E2.
  • the recording medium 60 is guided through the printing device in the manner already described.
  • a front side image is applied in a first color, for example red via the developer station 64/1 in the developer zone E2. This is followed by - fixing in the fixing station 68.
  • Another operating mode is the "two-color simplex mode", in which a narrow recording medium 60, for example A4 in width, is printed on one side with two colors.
  • Each recording medium position on the transfer printing station 65 is assigned a separately colorable developer zone E1, E2
  • a first pass through the transfer printing station 65 involves the printing of a toner image over the developer zone E2 in a first color, for example red.
  • the toner image of this first color is then fixed in the fixing station 68, shrinking of the recording medium taking place and the recording medium 60 becoming without turning the transfer station 65 fed again with the associated developer zone El.
  • the deflection device 28 is in the continuous position and the recording medium is only displaced in width while maintaining the front-back assignment.
  • the first -fixed toner image with the first color is superimposed (red) a second toner image with the second color (e.g., black), thus producing a two-color picture.
  • the superimposed toner image is then fixed again in the fixing station 68 and the recording medium printed on one side is deposited in the stacking device 72.
  • FIG. 4 shows a printing unit with an LED character generator.
  • a module plate 84 is arranged on a carrier 80 of the LED character generator 82 which is designed as a heat sink and which contains a large number of driver ICs (integrated integrated circuits) 86 and a line 88 with LEDs (light-emitting diodes) 90 carries.
  • Each LED corresponds to a pressure point.
  • the distance between the LEDs in line 90 corresponds to the desired resolution of the print image.
  • the light emission surfaces of the LEDs are imaged on a photoconductor 94 using a glass fiber optic, a so-called Selfoc module 92 or a microlens array, on a scale of 1: 1.
  • a latent electrostatic image is formed on the surface of the photoconductor 94 , which can be colored by a developer station with toner. Since there is a separate light source for each pixel of an exposure line 90, an entire pixel line on the photoconductor surface can be exposed at the same time without moving parts in the character generator by keeping all LEDs. _--
  • FIG. 5 shows an example of a shrinkage correction, with a compensation optics 96 being arranged between the Selfoc module 92 and the LED line .90 of the character generator 82 based on the example according to FIG. 4. that on the photoconductor surface 94 the line 90 depicted is reduced with LED luminous areas.
  • the image line depicted on the photoconductor surface 94 has a shortened length L2 due to the compensation optics 96 ,
  • a cylindrical lens can be used as compensation optics 96.
  • a plane-parallel optical plate can be used as the compensation optics, which is slightly curved in one axis by a tensioning device of the type of the compensation optics shown in FIG.
  • the clamping device can clamp the optical plate at the edges. This curvature is then created by pressure on these edges.
  • the optical disk can be displaced in the region of the central axis 98 by means of a clamping element in order to produce the curvature.
  • the use of an optical plate has the advantage that the curvature to be set can take place depending on the degree of shrinkage of the recording medium in the line direction.
  • the optical imaging is slightly changed by inserting the compensation optics 96. Due to the imaging effect of the compensation optics 96, the light of each LED emanates from a virtual line 98, as can be seen for an LED in FIG. 5 using two beam paths 100, 102.
  • the beam path 100 is the one without compensation optics 96 and the beam path 102 is the one with compensation optics 96.
  • Figure 6 shows a further embodiment of the inventions ⁇ fertil, wherein -for each printing operation is a change of the optical image.
  • the image dot lines are stretched with the aid of a first cylindrical lens 104 with a negative refractive power.
  • the length. AI of an image dot line is increased to the length A2.
  • the shrinkage effect can also be compensated for by the fact that, during the printing process alone, a predistortion takes place in the printing unit D1, which corresponds to the degree of shrinkage that occurred during fixing. In the printing process on the printing unit D2, post-distortion is then not necessary.
  • the overall effect is that the second toner image is applied to the recording medium in a form that is compressed compared to the first printing process.
  • Another way of compensating for the effect of the shrinkage is to act on the clock frequency with which an LED character generator according to the figure. 4 is controlled.
  • the shrinkage has to be taken into account when printing the second toner image. If this second toner image is applied to the through without If shrinkage is applied to shortened paper, and if this shrinkage later regresses, this second print image is extended in the respective main axes.
  • Typical shrinkage values are 0.1 to 0.15% at 26% relative humidity of the carrier material Embodiment with otherwise the same transport speed of the carrier material as in the first printing process, the clock frequency is increased in the same ratio as the shrinkage that occurs compared to the first printing process. Conversely, the shrinkage that occurred during the subsequent fixing process can of course also occur in the first printing process Clock frequency are reduced in order to increase the line spacing between the lines at the same transport speed as in the second printing process.
  • the photoconductor is exposed line by line using a polygon rotating mirror.
  • the line frequency depends on the speed of the polygen rotating mirror. In order to cause compression of the toner image in the line feed direction, this speed can be increased while the transport speed of the carrier material is otherwise constant, as in the first printing process, in order to effect shrinkage compensation.
  • LED character generators and laser beam character generators are described in "The Printer Book” in Section 4 "Optical Character Generators", ISBN 3-00-001019-X, Edition 4a, May 1999, Oce Printing Systems GmbH. This document is hereby incorporated by reference into the disclosure content of the present patent application.
  • a dynamic shrinkage correction can advantageously be carried out.
  • the degree of shrinkage is to be measured, for example by measuring the length and / or the width of a single sheet. In the case of tape material, this length can be determined, for example, using image masks.
  • a light barrier can be used for length measurement, which is arranged in front of the second printing unit. For example, the time of the
  • the clock frequency when driving the character generator, the rotational speed of the rotating mirror or the deflection of a plane-parallel plate can then be set according to the examples in FIGS. 5 and 6.
  • Preferably light barriers are arranged on each printing unit.
  • the running time of the single sheet on the first printing unit Dl can be defined as the target running time. The deviation and thus the degree of shrinkage is then determined on the second printing unit D2 with respect to this target running time.
  • the transport speed of the recording medium in the second printing process can be reduced compared to the transport speed in the first printing process. It is also achieved in this way that the second toner image is applied to the recording medium in compressed form compared to the first printing process.
  • the degree of shrinkage can - as mentioned before - be determined and, depending on this degree, the transport speed during the second printing process can be set. It is advantageous if the transport speed in the two printing devices is set by stepping motors. In this case, the signal frequency with which the stepper motors are driven can be changed depending on the degree of shrinkage in order to effect the shrinkage compensation.
  • the degree of shrinkage of the record carrier can advantageously also be determined empirically.
  • the compensation for the shrinkage is then set as a function of the empirically determined shrinkage, for example by adjusting the transport speed, the clock frequency of the
  • the shrinkage compensation can advantageously be used.
  • the single sheet printing system according to FIGS. 1 and 2 Both the example according to FIGS. 5 and 6 relating to the compensation optics and the examples relating to the change in the clock frequency for the LED character generator, the change in the rotational speed of the rotating mirror in the case of a laser beam character generator or the change in the transport speed can be used. The same applies to the aforementioned twin system.
  • the optical compensation along an axis can be combined with compensation in the axis perpendicular thereto, for example by changing the transport speed of the carrier material or the line frequency.
  • Compensation measures acting in the same direction can also be combined, such as the line frequency change and the change in the transport speed.
  • the .compensation measures can only be carried out on one printing device or can be distributed over both printing devices, if necessary also. with different compensation measures. - ';. ⁇

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Counters In Electrophotography And Two-Sided Copying (AREA)
  • Fixing For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour imprimer un support d'impression (94), une première image de toner étant imprimée sur un support d'impression dans une première étape d'impression. Cette première image de toner est fixée sur le support d'impression dans un dispositif de fixation, ledit support d'impression rétrécissant le long d'au moins un axe principal (L2). Une deuxième image de toner est ensuite imprimée sur le même support d'impression dans une deuxième étape d'impression, cette deuxième image de toner étant appliquée sur ce support d'impression au moyen d'une optique de compensation (96) sous une forme comprimée par rapport à la première étape d'impression dans le sens de l'axe principal.
PCT/EP2004/009660 2003-09-24 2004-08-30 Procede et dispositif pour corriger le retrecissement du papier WO2005040937A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE202004020953U DE202004020953U1 (de) 2003-09-24 2004-08-30 Einrichtung zur Korrektur der Papierschrumpfung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10344237.5 2003-09-24
DE10344237A DE10344237A1 (de) 2003-09-24 2003-09-24 Verfahren und Einrichtung zur Korrektur der Papierschrumpfung

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WO2005040937A1 true WO2005040937A1 (fr) 2005-05-06

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006028020B4 (de) * 2006-06-14 2011-08-18 Eastman Kodak Co., N.Y. Verfahren zur Steuerung einer Druckmaschine
DE102007040402B4 (de) 2007-08-27 2009-12-17 OCé PRINTING SYSTEMS GMBH Verfahren zur Registerkorrektur bei Papierschrumpfung
DE102018200994B4 (de) 2018-01-23 2020-03-12 Heidelberger Druckmaschinen Ag Durchstichpasser

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US5839016A (en) * 1997-11-24 1998-11-17 Xerox Corporation Fused image sensing
US6055008A (en) * 1997-07-16 2000-04-25 Phoenix Precision Graphics, Inc. Electrostatic printer having two-dimensional humidity compensation
US6101364A (en) * 1996-10-22 2000-08-08 Oce Printing Systems Gmbh Printer or copier with two printing units and a method for the operation thereof
US20010006584A1 (en) * 1999-12-27 2001-07-05 Hiroaki Yoshida Printing apparatus and printing method
US6587652B2 (en) * 2000-08-18 2003-07-01 Nexpress Solutions Llc Adjusting devices and method taking substrate changes into account for generating color separations in a multicolor printing machine

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US4755855A (en) * 1985-05-30 1988-07-05 Kabushiki Kaisha Toshiba Image forming apparatus with a forming position correcting function
US5093674A (en) * 1990-08-02 1992-03-03 Hewlett-Packard Company Method and system for compensating for paper shrinkage and misalignment in electrophotographic color printing
JP2002333744A (ja) * 2001-05-10 2002-11-22 Oki Data Corp 電子写真記録装置
DE10142326B4 (de) * 2001-08-30 2004-09-02 Océ Priting Systems GmbH Drucksystem aus meheren elektrofotografischen Druckgeräten, die nacheinander einen bandförmigen Aufzeichnungsträger bedrucken.
US6763199B2 (en) * 2002-01-16 2004-07-13 Xerox Corporation Systems and methods for one-step setup for image on paper registration

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US6101364A (en) * 1996-10-22 2000-08-08 Oce Printing Systems Gmbh Printer or copier with two printing units and a method for the operation thereof
US6055008A (en) * 1997-07-16 2000-04-25 Phoenix Precision Graphics, Inc. Electrostatic printer having two-dimensional humidity compensation
US5839016A (en) * 1997-11-24 1998-11-17 Xerox Corporation Fused image sensing
US20010006584A1 (en) * 1999-12-27 2001-07-05 Hiroaki Yoshida Printing apparatus and printing method
US6587652B2 (en) * 2000-08-18 2003-07-01 Nexpress Solutions Llc Adjusting devices and method taking substrate changes into account for generating color separations in a multicolor printing machine

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