EP1285756B1 - Procédé et machine d'impression pour déterminer les défauts de repérage - Google Patents

Procédé et machine d'impression pour déterminer les défauts de repérage Download PDF

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Publication number
EP1285756B1
EP1285756B1 EP02006038A EP02006038A EP1285756B1 EP 1285756 B1 EP1285756 B1 EP 1285756B1 EP 02006038 A EP02006038 A EP 02006038A EP 02006038 A EP02006038 A EP 02006038A EP 1285756 B1 EP1285756 B1 EP 1285756B1
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EP
European Patent Office
Prior art keywords
sheet
printing
registration
conveyor belt
registration mark
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.)
Expired - Lifetime
Application number
EP02006038A
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German (de)
English (en)
Other versions
EP1285756A1 (fr
Inventor
Ingo Klaus Michael Dreher
Heiko Hunold
Patrick Dr. Metzler
Stefan Schrader
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
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Eastman Kodak Co
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Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP1285756A1 publication Critical patent/EP1285756A1/fr
Application granted granted Critical
Publication of EP1285756B1 publication Critical patent/EP1285756B1/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
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/50—Marks on printed material
    • B41P2233/52—Marks on printed material for registering

Definitions

  • the invention relates to a method according to claim 1 and to a printing machine for applying the method according to claim 3.
  • the correct position printing of the printed image on the sheets is of considerable importance. This feature is referred to by the term registering.
  • register marks are used in addition to the printed image, by means of which deviations from the correct printing are detected and measured by the operator of the printing press.
  • the registration is determined and calculated by means of sensors in the printing press. For this purpose, the sensors detect the register marks on the conveyor belt or the sheet and determine by means of the position of the register marks, whether the printing takes place without errors.
  • the prior art methods and devices detect and correct errors caused by mechanical displacements of the sheets on the conveyor or conveyor belt. Furthermore, there are errors caused by the speed of the conveyor belt being different from the speed of the sheet on the conveyor belt. This effect stems from the fact that the conveyor belt is not straight at all points, especially in the printing modules, straight, but curvilinear by the pressing of rollers on the conveyor belt. The speed at the surface of the sheet is higher than the speed at the surface of the conveyor belt. Therefore, the surface of the sheet at the curved locations travels a longer distance per time than the surface of the conveyor belt. However, the distances traveled after which the image is applied to the sheet are determined by a certain time, which elapses during the movement of the conveyor belt between a sensor signal and a printing module.
  • the object of the invention is therefore the one described above To determine register errors. Another object of the invention is to correct the detected error.
  • the objects of the invention are achieved by a method according to claim 1 and by a printing machine according to claim 3. Advantageous embodiments are listed in the subclaims.
  • Fig. 1 shows a schematic view of a pressure roller 27 of a printing machine, which exerts a force F from below on a conveyor belt 1 of the printing press.
  • the pressure roller 27 is mounted and can exert a variable force F on the conveyor belt 1.
  • the conveyor belt 1 moves at a certain speed in the direction of the arrow and moves the pressure roller 27 by frictional engagement.
  • the conveyor belt 1 is shown in Fig. 1 ideally almost without spatial thickness expansion, the speed at the top of the conveyor belt 1 is actually higher than at the bottom, the speed difference with the thickness of the conveyor belt 1 increases. This effect can be explained by the curvature of the course of the conveyor belt 1 along the pressure roller 27.
  • a point on the top of the conveyor belt 1 is farther from the center of the pressure roller 27 than a point on the underside of the conveyor belt 1.
  • the speed at the top of the conveyor belt 1 is defined by v 2 .
  • On the conveyor belt 1 is a sheet 3 of paper, which is conveyed by the conveyor belt 1.
  • the sheet 3 is to a small extent the own weight and the greater part by electrostatic charge of the conveyor belt 1 held on this.
  • the surface of the sheet 3 moves at a speed v 1 in the direction of the arrow, v 1 being unequal to v 2 .
  • the speed of the sheet 3 increases with increasing distance from the center of the pressure roller 27 and thus changes with increasing thickness of the sheet 3.
  • the time of printing the sheet 3 by a printing cylinder or intermediate cylinder 25 above the sheet third is adapted to the speed v 2 of the surface of the pressure roller 27. Since the speed v 1 at the surface of the sheet 3 is not equal to v 2 , the printing on the surface of the sheet 3 is not timely, but delayed by the way that the surface of the sheet 3 travels more than the surface of the sheet 3 due to the different speeds This means that the greater the deviation of the two velocities v 1 and v 2 from one another, the greater the shift of the printed image on the sheet 3. Fig.
  • FIG. 2 shows a plan view of a section of a conveyor belt 1, which moves in the direction of the arrow at the speed v 2 .
  • a sheet 3 On the conveyor belt 1 is a sheet 3, which is held by electrostatic forces on the conveyor belt 1 substantially. With reference to Fig. 1, the sheet 3 moves at a higher speed v 1 than the conveyor belt 1, since the conveyor belt 1 and the sheet 3 have a curvature.
  • the term color separation is defined as one of the colors to be applied by the individual printing modules, which form the colorful overall picture, for example the color separations in four-color printing cyan, magenta, key and yellow.
  • a register mark 5 is applied to the conveyor belt 1 and to the sheet 3, adjacent to the register mark 5, a register mark 6, for example, in a first printing module.
  • the first printing module is the printing module for the color black, so that the register marks 5, 6 are used for setting and determining the registration of the black color separation of a printed image on the sheet 3. Additional printing modules each bring further register marks for further color separations on the sheet 3 and on the conveyor belt 1, which in this case not are shown.
  • the distance between the front edge of the register mark 5 and the front edge of the register mark 6 is d IST .
  • the distance d IST is determined by means of a second sensor 13 behind the printing modules, ie after all register marks have been applied to the sheet 3 and to the conveyor belt 1 for all color separations present.
  • the distance d IST is not equal to a distance d SOLL that would be determined without the sheet 3 if the register mark 6 were applied to the conveyor belt 1.
  • the distance d SOLL is determined in an ordinary calibration run, in which the register marks 5, 6 are applied to the conveyor belt 1. From the difference DIFF d between the detected distance d is the register marks 5, 6 of the register error for the color separation of the color black determined for the black color separation and the target value, the distance d ref, which is present is stored.
  • the distances d IST , d READ and d DIFF are present as specific cycle numbers, which can be converted into lengths with the aid of the speed of the conveyor belt 1.
  • the distance measurements between the register marks 5, 6 by means of the clock counter 20 lead to a sensitivity in the micrometer range.
  • the length difference d DIFF represented in cycle numbers is stored and used to calculate a correction factor represented by a clock number.
  • the correction factor serves to adjust the imaging by an imaging device 22 in such a way that the printing image is applied to it without errors irrespective of the presence of the sheet 3 and variable thicknesses of the sheet 3.
  • the correction factor affects signals to the imaging device 22 to apply images to an imaging cylinder 23, as described in detail below with reference to FIG.
  • the imaging by the imaging device 22 is previously performed for a certain time depending on the number of cycles of the correction factor is and the surface to be printed of the sheet 3 moves faster under the printing modules.
  • Fig. 3 shows a schematic block diagram of a printing module above a conveyor belt 1, which moves in the direction of the straight arrow.
  • the conveyor belt 1 is driven by a drive on the second deflection roller 14 and conveys sheet 3 through the printing press.
  • Between the second guide roller 14 and the first guide roller 16 usually further rollers are arranged, which are not shown in Fig. 3.
  • a first sensor 12 detects the leading edge of the sheet 3 and transmits a signal to a clock counter 20, which is connected to a correction device 30.
  • the clock counter 20 transmits after a certain predetermined number of clocks a signal to the imaging device 22, which transmits an image on a Beggungszylinder 23 due to the signal.
  • the image is transferred to an intermediate cylinder 25, which rotates in the opposite direction to the imaging cylinder 23, and printed by the intermediate cylinder 25 by rolling the intermediate cylinder 25 on the sheet 3.
  • the intermediate cylinder 25 exerts a force on the conveyor belt 1 from above, a pressure roller 27 exerts an opposing force on the conveyor belt 1 from below.
  • the imaging cylinder 23, the intermediate cylinder 25, the first deflection roller 16 and the pressure roller 27 are driven by frictional engagement with the conveyor belt 1, which is driven by the drive on the second deflection roller 14.
  • the imaging cylinder 23 and the intermediate cylinder 25 have a first encoder 24 and a second encoder 26, respectively, which determine the angle of rotation of the imaging cylinder 23 and the intermediate cylinder 25, respectively, and thus enable determination of the position thereof.
  • the imaging by the imaging device 22 triggered by the clock counter 20 as a consequence of the signal transmitted by the first sensor 12 takes place precisely at a point in time that the image is transferred from the imaging cylinder 23 via the intermediate cylinder 25 to the sheet 3 with micrometer precision.
  • the time which elapses from the imaging of the imaging cylinder 23 to the application of the image to the sheet 3 is referred to as a delay time.
  • image here includes individual image lines, image areas and images of color separations. Color separations are the final overall picture on the sheet 3 together. The effect described with reference to FIGS. 1 and 2, caused by the sheet 3, however, leads to errors, the image is not applied to the desired location on the sheet 3.
  • the cycle counter 20 counts a cycle number between the detection of the front edge of the register mark 5 and the front edge of the register mark 6 and transmits the cycle number to the correction device 30, wherein from the cycle number and the known speed of the conveyor belt 1, a distance d IST between the front edge of the register mark. 5 and the leading edge of the register mark 6 is calculable.
  • a desired value of the distance d SOLL of the front edge of the register mark 5 from the front edge of the register mark 6 is also stored as a corresponding number of cycles. From the calculated actual distance D and the stored nominal value of the distance d ref, a difference d DIFF formed as a correction value.
  • the above calibration procedure is performed several times, averaging the obtained correction values to a final correction value.
  • the final correction value is added in the correction device 30 to a delay value corresponding to the delay time.
  • a corrected delay value is present in the clock counter 20 which corresponds to the delay value modified by the final correction value and takes into account the influence of the register error described above.
  • the corrected delay values may be stored in the corrector 30 for various types of sheets 3. Before printing, the type of sheet 3 is input to a controller of the printing press, and the printing is carried out the corrected delay value associated therewith. In this way, the detection operation of the correction value and the calculation of the corrected delay value for correcting the above-described register error are saved for different types of sheets having different thicknesses.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Sheets Or Webs (AREA)

Claims (5)

  1. Procédé de détection d'erreurs de registre pendant l'impression, ces erreurs étant causées par une variation de la vitesse d'un tambour d'impression, notamment en raison d'une feuille (3),
    caractérisé par l'application d'au moins une première marque de registre (5) sur la bande de transport (1) devant une feuille (3) et d'au moins une deuxième marque de registre (6) sur la bande de transport (1) derrière la feuille (3), par la détection de la première marque de registre (5) et de la deuxième marque de registre (6), par le calcul d'une cadence entre la détection de la première marque de registre (5) et la deuxième marque de registre (6) et par la comparaison de la valeur calculée de la cadence à une valeur de consigne.
  2. Procédé selon la revendication 1,
    caractérisé en ce que la feuille (3) est détectée par un premier capteur (12) devant les modules d'impression, ce détecteur générant, au moment de la détection de la feuille (3), un signal de départ déclenchant un compteur d'impulsions (20), en ce que les marques de registre (5, 6) sont appliquées par les modules d'impression et en ce que les marques de registre (5, 6) sont détectées par un deuxième capteur (13) derrière les modules d'impression, ce deuxième capteur générant un signal d'arrêt pour arrêter le compteur d'impulsions (20).
  3. Imprimante utilisée pour appliquer le procédé selon la revendication 1,
    caractérisée par un dispositif (10) déterminant les erreurs de registre lors de l'impression causées par des variations de vitesse d'un tambour d'impression en raison d'une feuille (3) comprenant des moyens d'application d'au moins une première marque de registre (5) sur la bande de transport (1) devant une feuille (3) et d'au moins une deuxième marque de registre (6) sur la bande de transport (1) derrière la feuille (3), des moyens de détection de la première marque de registre (5) et de la deuxième marque de registre (6), des moyens de calcul d'une cadence entre la détection de la première marque de registre (5) et de la deuxième marque de registre (6) et des moyens de comparaison de la valeur calculée de la cadence à une valeur de consigne.
  4. Imprimante selon la revendication 3,
    caractérisée par un dispositif de correction (30) corrigeant les erreurs de registre déterminées.
  5. Imprimante selon la revendication 3 ou 4,
    caractérisée par un premier capteur (12) générant un signal de départ déclenchant un compteur d'impulsions (20) à la détection d'une feuille (3), des modules d'impression appliquant des marques de registre (5, 6), un deuxième capteur (13) générant un signal d'arrêt pour arrêter le compteur d'impulsions (20) et un dispositif de correction (30) corrigeant les erreurs de registre pendant l'impression causées par des variations de vitesse d'un tambour d'impression en raison d'une feuille (3).
EP02006038A 2001-08-22 2002-03-16 Procédé et machine d'impression pour déterminer les défauts de repérage Expired - Lifetime EP1285756B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10141034A DE10141034A1 (de) 2001-08-22 2001-08-22 Verfahren und Druckmaschine zum Ermitteln von Registerfehlern
DE10141034 2001-08-22

Publications (2)

Publication Number Publication Date
EP1285756A1 EP1285756A1 (fr) 2003-02-26
EP1285756B1 true EP1285756B1 (fr) 2006-10-11

Family

ID=7696179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02006038A Expired - Lifetime EP1285756B1 (fr) 2001-08-22 2002-03-16 Procédé et machine d'impression pour déterminer les défauts de repérage

Country Status (4)

Country Link
US (1) US6619209B2 (fr)
EP (1) EP1285756B1 (fr)
JP (1) JP2003094612A (fr)
DE (2) DE10141034A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10227766A1 (de) * 2002-06-21 2004-01-15 Nexpress Solutions Llc Verfahren und Steuerungseinrichtung zum Vermeiden von Registerfehlern
DE10241609A1 (de) * 2002-09-07 2004-03-18 Nexpress Solutions Llc Verfahren und Steuerungseinrichtung zum Bestimmen eines Registerfehlers
JP3604683B2 (ja) * 2002-09-24 2004-12-22 株式会社リコー カラー画像形成装置、タンデムドラム式カラー画像形成装置、およびカラー画像形成装置に用いるプロセスカートリッジ
DE10305047B4 (de) * 2002-10-11 2010-08-12 Eastman Kodak Company Verfahren zur Kalibrierung des passergenauen Druckprozesses einer Farbdruckmaschine
DE10304763A1 (de) * 2003-02-05 2004-08-26 Nexpress Solutions Llc Verfahren zur Korrektur der Kalibrierung eines passergenauen Druckprozesses
KR100472487B1 (ko) * 2003-03-07 2005-03-09 삼성전자주식회사 화상 정렬 오차 보정방법 및 장치
US7035558B2 (en) * 2004-02-11 2006-04-25 Hewlett-Packard Development Company, L.P. Method of detecting a rotation of print cartridge components
US7590619B2 (en) * 2004-03-22 2009-09-15 Microsoft Corporation Search system using user behavior data
DE102007037254A1 (de) * 2007-08-07 2009-02-12 Manroland Ag Sensorvorrichtung und Druckmaschine mit einer Sensorvorrichtung
DE102007049679B4 (de) * 2007-10-17 2013-10-17 Robert Bosch Gmbh Markierungssensor und Verfahren zum Auswerten von Markierungen
WO2016048342A1 (fr) * 2014-09-26 2016-03-31 Hewlett-Packard Development Company, L.P. Réglage de longueur de cadre
EP3213090B1 (fr) 2014-10-28 2020-06-17 Hewlett-Packard Development Company, L.P. Ajustement de fréquences de codeur émulé
US11829084B2 (en) 2021-09-28 2023-11-28 Eastman Kodak Company Registration of white toner in an electrophotographic printer
US11822262B2 (en) 2021-09-28 2023-11-21 Eastman Kodak Company Registration of white toner using sensing system with colored reflector plate

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915090A (en) * 1973-03-21 1975-10-28 Armstrong Cork Co Printed pattern and embossed pattern registration control system
DE3302798A1 (de) * 1983-01-28 1984-08-02 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum voreinstellen an druckmaschinen
DE3720396A1 (de) * 1987-06-19 1989-01-05 Braun Gmbh Ind Elektronik Messeinrichtung fuer die rapportlaenge
US5384592A (en) * 1992-11-16 1995-01-24 Xerox Corporation Method and apparatus for tandem color registration control
US5802974A (en) * 1996-03-25 1998-09-08 The Procter & Gamble Company Apparatus for sheet having indicia registered with lines of termination
US5875380A (en) 1997-02-18 1999-02-23 Ricoh Company, Ltd. Image forming apparatus eliminating influence of fluctuation in speed of a conveying belt to correction of offset in color registration
JP2000272089A (ja) 1999-03-24 2000-10-03 Tdk Corp 印刷位置ズレ補正方法
EP1157837B1 (fr) * 2000-05-17 2009-06-24 Eastman Kodak Company Procédé pour la mise en repérage dans une presse multicolor
EP1249415A3 (fr) * 2001-04-14 2004-02-04 NexPress Solutions LLC Procécé et dispositif pour mesurer des positions de feuilles en mouvement continu
US6796240B2 (en) * 2001-06-04 2004-09-28 Quad/Tech, Inc. Printing press register control using colorpatch targets

Also Published As

Publication number Publication date
DE10141034A1 (de) 2003-03-20
US6619209B2 (en) 2003-09-16
US20030037690A1 (en) 2003-02-27
JP2003094612A (ja) 2003-04-03
DE50208390D1 (de) 2006-11-23
EP1285756A1 (fr) 2003-02-26

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