EP1396341A1 - Procédé et dispositif de commande pour déterminer des défauts de repérage - Google Patents

Procédé et dispositif de commande pour déterminer des défauts de repérage Download PDF

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Publication number
EP1396341A1
EP1396341A1 EP03014130A EP03014130A EP1396341A1 EP 1396341 A1 EP1396341 A1 EP 1396341A1 EP 03014130 A EP03014130 A EP 03014130A EP 03014130 A EP03014130 A EP 03014130A EP 1396341 A1 EP1396341 A1 EP 1396341A1
Authority
EP
European Patent Office
Prior art keywords
sheet
register
sensor
error
transport
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP03014130A
Other languages
German (de)
English (en)
Other versions
EP1396341B1 (fr
Inventor
Dieter Karl-Heinz Dobberstein
Walter Dr. Dworschak
Christian Friedrich Dr. Engeln
Heiko Hunold
Patrick Dr. Metzler
Karlheinz Walter Dr. Peter
Rolf Johannes Spilz
Stefan Theden
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
NexPress Solutions LLC
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 Eastman Kodak Co, NexPress Solutions LLC filed Critical Eastman Kodak Co
Publication of EP1396341A1 publication Critical patent/EP1396341A1/fr
Application granted granted Critical
Publication of EP1396341B1 publication Critical patent/EP1396341B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/90—Register control
    • B41P2213/91—Register control for sheet printing presses

Definitions

  • the invention relates to a method according to claim 1 and Control device according to claim 11.
  • the register mark at a thick printing material applied in a slightly different place than in a thin substrate are corrected regularly, whereby corrective measures reduce press availability which are usually carried out with special calibration runs.
  • Another disadvantage of the prior art described is the high number of detection elements. In addition, every bow in the prior art stopped to align, with significant time elapsing.
  • the object of the invention is a register error reliably and easily Way to determine. Another object of the invention is the register error to correct.
  • a method and a control device for determining are provided a register error in which at least one register mark is printed and at least one sensor detects the register mark, the sheet edge of the Sheet is detected by the sensor and the register error from the sensor data and target data is determined.
  • At least two Register marks with a distance across the transport direction applied the Register errors are recorded in the transport direction of the sheet and from the An angular error of the arc is determined by sensor data. With this characteristic angle errors are easy to determine.
  • An embodiment of the invention discloses a method that during Printing process is carried out, the printing result is from the first sheet usable without rejects from sheets and calibration runs of the Printing machine are avoided.
  • the print quality is increased because of the Register errors are constantly recorded and corrected, not just during one Calibration pass before printing, with a drift of the Register error is detected that occurs with longer press run times. By omitting the calibration run the Press availability increased. Furthermore, there are no sheets due to of the printing with register marks are not used.
  • the pressure is from first sheet can be used.
  • the register mark is set to Transport medium printed for conveying a sheet. Will be beneficial achieved that the print job from the first sheet can be used and none Bow scrap arises.
  • the senor detects the register mark and in response, an angle of rotation of a drive roller of the Transport medium determined, the sensor detects the sheet edge and as In response to this, the angle of rotation of the drive roller of the transport medium and the angle of rotation difference is determined, the angle of rotation difference is determined with a Setpoint angle difference compared and the register error is from the Comparison determined.
  • the register error is determined for different types of substrates. Errors caused by different compressibility of different substrates with regard to register accuracy be avoided.
  • An embodiment of the invention discloses that the register error for different types of substrates is determined and in an assignment table a control device of the printing press is stored.
  • FIG. 1 shows an embodiment of the invention with a schematic plan view of a section of a transport medium 11 with a sheet 3 displaced in the longitudinal direction.
  • the transport medium 11 is in this case a transport belt, but can be implemented differently, for example, as a cylinder.
  • the sheet 3 is shown with solid lines, the correct position of the sheet 3 without displacement of the sheet 3 in the longitudinal direction is shown with dashed lines. A so-called intrack error is shown.
  • the path of the incorrect longitudinal displacement of the arc 3 is ⁇ x .
  • a register mark 2 is applied to the transport medium 11. This is followed by the sheet 3 on the transport medium 11.
  • the sensor 15 above the transport medium 11 first detects the register mark 2 and then the front edge of the sheet 3.
  • the path between the register mark 2 and the front edge of the sheet 3 is x1.
  • a number of cycles between the detection of the register mark 2 and the front edge of the sheet 3 by the sensor 15 is counted by a cycle counter 20.
  • the counted number of cycles can be assigned to path x1 , since the speed of the sheet 3 and the clock frequency of the clock counter 20 are known.
  • the number of cycles counted by the clock counter 20 denotes actual data.
  • the actual data are compared with target data, a clock difference being calculated which corresponds to the path ⁇ x and can be converted therein.
  • the path ⁇ x calculated in this way is assigned a calibration value which represents a correction value for the register error.
  • the control of the transport rollers 4, 4 'by means of the calibration values causes the sheet 3 to be displaced by the distance ⁇ x independently of the transport of the sheet 3 through the transport rollers 4, 4'.
  • the road ⁇ x is usually in addition to the distance traveled back down the sheet. 3 Other transport rollers can be carried out, but are not shown. In this way, the displacement of the sheet 3 is compensated.
  • the register error in the transport direction of the sheet 3 can alternatively be corrected by actuating an imaging device 22 by shifting the imaging time by a time assigned to the path ⁇ x .
  • the process described takes place during printing, a special calibration run is not required, the registration error of the sheet 3 is corrected in the movement of the sheet 3 during transport.
  • register mark 2 is not printed on sheet 3, there is no reject of sheet 3, and the first printed sheet 3 can already be used as a printing result.
  • Each sheet 3 and each register mark 2, which are detected, generate further calibration values which can be used individually for correction or can be averaged, the averaged calibration values being used like the individual calibration values for correcting the register error.
  • the calibration values remain permanently saved in the assignment table. In this way, suitable calibration values are available at the beginning of a printing process in order to avoid register errors. Furthermore, the register errors are dependent on the substrate, different substrates produce register errors of different sizes. Since the type of printing material is known in the printing press by the operator during each printing process by entering the special printing process, the calibration values can be stored as a function of the printing material. A special assignment table is therefore available for each type of substrate.
  • the type of printing material is determined on the basis of the data relating to the printing process and stored calibration values are called up from the assignment table, which is adapted to the type of printing material.
  • calibration values are available at the start of a print job, which depend on the type of substrate.
  • the speed of the transport rollers 4, 4 ' is increased in such a way that the sheet 3 is additionally transported forward on the transport medium 1 by the distance ⁇ x .
  • the sheet 3 is transported without correction by the transport rollers 4, 4 'at a linear speed to which an additional speed is added using the calibration values, the transport rollers 4, 4' are accelerated for a short time.
  • the additional speed compensates for the determined path difference ⁇ x , which represents a register error in the transport direction of the sheet 3.
  • the sheet 3 is conveyed further to another transport medium 11 on which the printing of the sheet 3 is carried out, as described under FIG. 3.
  • FIG. 2 shows a schematic top view of a section of a transport medium 11 with an angular displacement of the sheet 3 in order to avoid a registration error of the sheet 3 which is based on an angular displacement of the sheet 3.
  • the sheet 3 is shown with solid lines, the correct position of the sheet 3 without angular displacement of the sheet 3 is shown with dashed lines.
  • the curve 3 is shifted by the angle ⁇ to the left according to FIG. 2, there is a so-called skew error.
  • two sensors 15 ', 15 are arranged at the same height with respect to the transport direction of the sheet 3.
  • the angular displacement of the sheet 3 means that the left side of the sheet 3 at the detection point by the sensor 15' by the distance ⁇ x2 is shifted backwards, while the right side of the sheet 3 is shifted forward by the path ⁇ x3 at the detection point by the sensor 15 ".
  • the two sensors 15', 15" each detect the front edge of the sheet 3 and a register mark 2 ', 2 ", which is applied to the transport medium 11 Due to the angular displacement, the sensor 15 "detects the register mark 2" before the sensor 15 'detects the register mark 2'.
  • Each sensor 15 ', 15 "generates sensor data from which the clock counter 20 generates a clock difference which corresponds to the path x2 or x3 corresponds.
  • the path x2 corresponds to the distance of the register mark 2 'from the front edge of the sheet 3, measured by the sensor 15'
  • the path x3 corresponds to the distance of the register mark 2 "from the front edge of the sheet 3, measured from the sensor 15".
  • the path difference ⁇ x2 corresponds to the displacement of the sheet 3 due to the angular displacement at the point at which the sensor 15 'detects the front edge of the sheet 3
  • the path difference ⁇ x3 corresponds to the displacement of the sheet 3 due to the angular displacement at the point at which the Sensor 15 "detects the front edge of the sheet 3, in each case in relation to the error-free position of the sheet 3, which is shown with dashed lines.
  • the clock difference from the sensor data of the sensor 15 ' is in the device 30 with the clock difference from the sensor data of the sensor 15 " compared. From the comparison of the clock differences, a calibration value is unambiguously obtained, which can be assigned to an angular displacement of the arc 3.
  • the device 30 controls the transport roller 4 and accelerates it.
  • the transport roller 4 ' is moved further at a uniform speed, while the speed of the transport roller 4 is increased in such a way that the angular displacement of the sheet 3 is compensated for by the angle ⁇ .
  • the left side of the sheet 3 is thus conveyed for a short time at a different speed than the right side.
  • FIG. 3 shows a further embodiment of the invention with a schematic top view of a section of a transport medium 11 with an angular displacement of the sheet 3 in order to avoid a registration error of the sheet 3 which is based on an angular displacement of the sheet 3.
  • the sheet 3 is shown with solid lines, the correct position of the sheet 3 without angular displacement of the sheet 3 is shown with dashed lines.
  • the curve 3 is shifted by the angle ⁇ to the left according to FIG. 2, there is a so-called skew error.
  • two sensors 15 ', 15 are arranged at the same height with respect to the transport direction.
  • the angular displacement of the sheet 3 means that the left side of the sheet 3 at the detection point by the sensor 15' backwards by the distance ⁇ x4 is shifted, while the right side of the sheet 3 at the detection point by the sensor 15 "is shifted forward by the path ⁇ x5 with respect to the transport direction.
  • the two sensors 15', 15" each detect the front edge of the sheet 3 and a register mark 2 ', 2 ", which is applied to the sheet 3 Due to the angular displacement, the sensor 15 "detects the register mark 2" before the sensor 15 'detects the register mark 2'.
  • Each sensor 15 ', 15 "generates sensor data from which the clock counter 20 generates a clock difference.
  • the path difference ⁇ x4 corresponds to the displacement of the sheet 3 due to the angular displacement at the point at which the sensor 15 'detects the front edge of the sheet 3
  • the path difference ⁇ x5 corresponds to the displacement of the sheet 3 due to the angular displacement at the point at which the Sensor 15 "detects the front edge of sheet 3, in each case in relation to the correct position of sheet 3.
  • the clock difference from the sensor data of sensor 15 ' is compared in device 30 with the clock difference from the sensor data of sensor 15". From the comparison of the clock differences, a calibration value is unambiguously obtained, which can be assigned to an angular displacement of the arc 3.
  • the calibration value is then used to correct the register error.
  • the device 30 controls the transport roller 4 and accelerates it.
  • the transport roller 4 ' is moved further at a uniform speed, while the speed of the transport roller 4 is increased in such a way that the angular displacement is compensated for by the angle ⁇ .
  • the left side of the sheet 3 is thus conveyed at a different speed than the right side.
  • the register marks 2 ', 2 "are applied to the sheet 3 and not to the transport medium 11. This has the consequence that the sheet 3 in the embodiment according to FIG. 3, in contrast to the embodiment according to Fig. 2, cannot be used as the printing result, the sheet 3 becomes rejects.
  • the method of the embodiment according to Fig. 3 is carried out in a special calibration run which takes place before the printing process.
  • FIG. 4 shows a special embodiment of the invention, register errors being determined which are defined by the sheet 3 slipping perpendicular to the transport direction of the sheet 3.
  • the sheet 3 is shifted by a path ⁇ x6 to the right perpendicular to the transport direction of the sheet 3.
  • the correct position of the sheet 3 on the conveyor belt 11 is shown by dashed lines, the incorrect position of the sheet 3 is indicated by solid lines.
  • the register error perpendicular to the transport direction of the sheet 3, a so-called cross-track error has a size of ⁇ x6 in FIG. 4.
  • the direction of the error is indicated by the double-sided arrow in FIG. 4.
  • the sensor 15 is arranged above the sheet 3 approximately in the region of the side edge of the sheet 3.
  • a register mark 2 V is applied to the conveyor belt 11 as a vertical bar, ie the register mark 2 V is parallel to the side edges of the sheet 3, provided that the sheet 3 has no angular displacement.
  • the register error is determined by the sensor 15 detecting the register mark 2 V and then at least one side edge of the sheet 3.
  • the sensor 15 comprises, for example, an LED row or a CCD row, with a section 32, which is shown with dashed lines, in which a section of the side edge of the sheet 3 is located, being detected by the sensor 15. If the position is correct, the 2 V register mark is preferably located on the same line, viewed in the transport direction, as the side edge of the sheet 3.
  • the incorrect position of the side edge of the sheet 3 is determined as a function of the 2 V register mark.
  • the path ⁇ x6 can be determined, similarly as described above.
  • a correction of the register error in the present case a displacement of the sheet 3 to the left by the path ⁇ x6 is carried out in such a way that the transport rollers 4, 4 'are controlled accordingly by the device 30 and are shifted to the left by the path ⁇ x6 .
  • This is shifted to the left by the same path as the transport rollers 4, 4 '.
  • the registration error is corrected and corrected during the printing process, as described.
  • FIG. 5 shows a schematic side view of part of a printing module or printing unit of a multi-color printing machine above a transport medium 11 and a control device 19.
  • An embodiment of the invention according to FIG. 1 is shown as an example, with a single sensor 15 and a single register mark 2 per sheet 3 is provided and an arc displacement in the longitudinal direction to the transport direction can be determined and corrected. In a similar way, an embodiment for determining and correcting an angular displacement of the arc 3 can be carried out.
  • the transport medium 11 follows the transport medium 1, which is shown in a section in FIG. 1, the sheet 3 is conveyed onto the transport medium 11 by the transport medium 1, which is stretched around rollers 17, 18.
  • the sheet 3 is in this case moved by the transport rollers 4, 4 'which engage the sheet 3, the transport medium 1 is rigid in this case.
  • the printing press usually has a plurality of printing modules, each printing module applies one color, the individual colors being printed on top of one another on a printing material, here sheet 3, to form the overall image, as is known.
  • the transport medium 11 is driven by the drive on a second deflection roller 16 and moves in the direction of the arrow.
  • the first deflection roller 14, the second deflection roller 16, an intermediate cylinder 25, an imaging cylinder 23 and an impression cylinder 27 for providing a counterforce to the compressive force of the intermediate cylinder 25 move in the directions shown in FIG. 5 by the curved arrows.
  • the term printing cylinder 23, 25 encompasses the imaging cylinder 23 and the intermediate cylinder 25 as an intermediate carrier of the printed image, depending on whether the image from the imaging cylinder 23 is transferred directly to a sheet 3 or first to an intermediate cylinder 25 and from there to the sheet 3 becomes.
  • the imaging cylinder 23 and the intermediate cylinder 25 have a first rotary encoder 24 and a second rotary encoder 26, respectively, which detect a specific angle of rotation of the imaging cylinder 23 and the intermediate cylinder 25, so that their angle of rotation is known at all times.
  • the first encoder 24 on the imaging cylinder 23 and the second encoder 26 on the intermediate cylinder 25 transmit the detected angles of rotation to a device 30.
  • the device 30 comprises assignment tables or look-up tables, which are designed as registers, which data from the first encoder 24, from the second encoder 26, obtained from the drive in the second deflection roller 16 and from a sensor 15 or register sensor and in each case cycle numbers are assigned.
  • the clock numbers obtained from the look up tables serve to determine the point in time at which the imaging cylinder 23 begins to be imaged with an image.
  • image includes color separations from images of the individual printing modules that compose the overall image, for example the color separations cyan, magenta, yellow and black in four-color printing, individual lines of the image or image areas. 5 shows only one printing module for a color separation, cyan, magenta, yellow or black, and further printing modules can be carried out along the transport medium 11.
  • the clock counter 20 transmits a signal to an imaging device 22, which transmits an electrostatic image to the imaging cylinder 23 on the basis of the signal.
  • the imaging cylinder 23 has an electrostatically charged photoconductor which is exposed to controlled light from the imaging device 22, for example from an LED source or a laser.
  • the electrostatic charges are removed.
  • toner particles with magnetically opposite charges are applied to the areas freed from the electrostatic charges and an image is present on the imaging cylinder 23.
  • the image is transferred to an intermediate cylinder 25, which rotates in the opposite direction to the imaging cylinder 23, and is printed onto the sheet 3 by the intermediate cylinder 25 by rolling off the intermediate cylinder 25.
  • the intermediate cylinder 25 exerts a force on the transport medium 11 from above
  • an impression cylinder 27 exerts a force opposite the intermediate cylinder 25 on the transport medium 11 from below.
  • the imaging cylinder 23, the intermediate cylinder 25, the first deflection roller 14 and the impression cylinder 27 are driven by frictional engagement with the transport medium 11, which is driven by a drive on the second deflection roller 16.
  • the imaging by the imaging device 22, which is triggered by the clock counter 20, takes place exactly at a point in time that the image from the imaging cylinder 23 is transferred to the sheet 3 via the intermediate cylinder 25 with micrometer accuracy.
  • the register mark 2 is transferred from the intermediate cylinder 25 to the transport medium 11.
  • the sensor 15 at the end of the transport medium 11 first detects the register mark 2 on the transport medium 11, in response transmits a signal to the device 30 which triggers a counting of a clock of the clock counter 20.
  • the sensor 15 detects the front edge of the sheet 3 and, in response thereto, transmits a signal to the device 30 which stops the counting of the clock.
  • Each register mark 2 is followed by a sheet 3. Between the detection of the register mark 2 and the front edge of the sheet 3, a cycle number is counted, which denotes the distance x1 between the register mark 2 and the front edge of the sheet 3.
  • the number of cycles is clearly a distance, here the distance x1 can be assigned in the example.
  • the counted number of cycles denotes actual data, which is compared in the device 30 with target data. If the comparison shows that the actual data match the target data, there is no register error. If the comparison shows that the actual data do not match the target data, there is a register error which is greater, the greater the deviation of the actual data from the target data, the greater the distance ⁇ x is, the greater the deviation of the actual data from the target data.
  • the path difference ⁇ x calculated in this way is assigned to a calibration value in the assignment table of the device 30.
  • the transport rollers 4, 4 ′ which are arranged above the transport medium 1 and transport the sheet 3, are actuated with the calibration value.
  • the transport rollers 4, 4 ' usually convey the sheet 3 evenly and are accelerated negatively or positively for a short time in order to avoid a register error.
  • the transport rollers 4, 4 ' are accelerated in such a way that the sheet 3 is additionally moved forward by the path ⁇ x .
  • the sheet 3 reaches the transport medium 11 at the right time, so that the printing by the intermediate cylinder 25 is carried out without errors.
  • the sheet 3 is consequently transferred from the transport medium 1 to the transport medium 11 in the correct orientation with respect to the transport direction.
  • the sheet 3 is also transferred to the transport medium 11 in the correct position with respect to the direction perpendicular to the transport direction of the sheet 3.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Handling Of Sheets (AREA)
  • Error Detection And Correction (AREA)
EP03014130A 2002-09-07 2003-06-24 Procédé et dispositif de commande pour déterminer des défauts de repérage Expired - Lifetime EP1396341B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10241609A DE10241609A1 (de) 2002-09-07 2002-09-07 Verfahren und Steuerungseinrichtung zum Bestimmen eines Registerfehlers
DE10241609 2002-09-07

Publications (2)

Publication Number Publication Date
EP1396341A1 true EP1396341A1 (fr) 2004-03-10
EP1396341B1 EP1396341B1 (fr) 2008-09-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03014130A Expired - Lifetime EP1396341B1 (fr) 2002-09-07 2003-06-24 Procédé et dispositif de commande pour déterminer des défauts de repérage

Country Status (4)

Country Link
US (1) US7162956B2 (fr)
EP (1) EP1396341B1 (fr)
AT (1) ATE409116T1 (fr)
DE (2) DE10241609A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004015101B4 (de) * 2004-03-27 2012-04-26 Eastman Kodak Co. Verfahren und Sensoreinrichtung zum Steuern eines endlosen, eine Naht aufweisenden Transportmediums für eine Druckmaschine
DE102005007435A1 (de) 2005-02-18 2006-08-24 Bosch Rexroth Ag Verfahren zum Durchführen einer Druckkorrektur und Vorrichtung hierfür
FR2910372B1 (fr) * 2006-12-21 2010-12-10 Goss Int Montataire Sa Dispositif de commande d'une presse rotative d'impression d'une bande de matiere,et presse rotative.
JP4664391B2 (ja) * 2008-04-28 2011-04-06 シャープ株式会社 印刷出力装置および印刷出力システム
US20150116734A1 (en) * 2013-10-24 2015-04-30 Joshua Hart Howard Printer with image plane alignment correction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0521158A1 (fr) * 1990-04-13 1993-01-07 Sk Engineering Ltd Dispositif chargeur de feuilles
EP0541260A2 (fr) * 1991-11-04 1993-05-12 Xerox Corporation Appareil d'ajustement d'une feuille par rotation et déplacement latéral
US20020024681A1 (en) * 2000-06-28 2002-02-28 Holger Leonhardt Method for determining a printing-image position, and monitoring device for a printing machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0708046A1 (fr) * 1994-10-21 1996-04-24 Maschinenfabrik Gietz Ag Dispositif de répérage et d'alimentation de feuilles
DE10141034A1 (de) * 2001-08-22 2003-03-20 Nexpress Solutions Llc Verfahren und Druckmaschine zum Ermitteln von Registerfehlern
DE10141035A1 (de) * 2001-08-22 2003-03-20 Nexpress Solutions Llc Verfahren und Druckmaschine zum Ermitteln von Registerfehlern
US6848361B2 (en) * 2002-01-18 2005-02-01 Eastman Kodak Company Control device and method to prevent register errors
DE10227766A1 (de) * 2002-06-21 2004-01-15 Nexpress Solutions Llc Verfahren und Steuerungseinrichtung zum Vermeiden von Registerfehlern
US6997455B2 (en) * 2004-02-09 2006-02-14 Eastman Kodak Company Sheet deskewing method and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0521158A1 (fr) * 1990-04-13 1993-01-07 Sk Engineering Ltd Dispositif chargeur de feuilles
EP0541260A2 (fr) * 1991-11-04 1993-05-12 Xerox Corporation Appareil d'ajustement d'une feuille par rotation et déplacement latéral
US20020024681A1 (en) * 2000-06-28 2002-02-28 Holger Leonhardt Method for determining a printing-image position, and monitoring device for a printing machine

Also Published As

Publication number Publication date
US20060013468A1 (en) 2006-01-19
DE10241609A1 (de) 2004-03-18
ATE409116T1 (de) 2008-10-15
DE50310536D1 (de) 2008-11-06
US7162956B2 (en) 2007-01-16
EP1396341B1 (fr) 2008-09-24

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