EP1285758A1 - Procédé et dispositif d'imagerie d'ajustement de repérage - Google Patents

Procédé et dispositif d'imagerie d'ajustement de repérage Download PDF

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Publication number
EP1285758A1
EP1285758A1 EP02006045A EP02006045A EP1285758A1 EP 1285758 A1 EP1285758 A1 EP 1285758A1 EP 02006045 A EP02006045 A EP 02006045A EP 02006045 A EP02006045 A EP 02006045A EP 1285758 A1 EP1285758 A1 EP 1285758A1
Authority
EP
European Patent Office
Prior art keywords
register
calibration
frame
printing
marks
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.)
Withdrawn
Application number
EP02006045A
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German (de)
English (en)
Inventor
Patrick Dr. Metzler
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
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 NexPress Solutions LLC filed Critical NexPress Solutions LLC
Publication of EP1285758A1 publication Critical patent/EP1285758A1/fr
Withdrawn legal-status Critical Current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
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B41F13/14—Registering devices with means for displacing the cylinders
    • 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 for register setting for Printing machines in multi-color printing according to claim 1 and on one Imaging device for applying the method according to claim 4.
  • the printing industry is using multicolor printing to apply various Color separations each individual successive print modules in the Printing press used.
  • the color separations are in the print modules successively applied to the printing material and result one above the other prints the final color print image.
  • an exact overprint or the color separations stand on top of each other and an error-free printed image ensure that calibration runs are in preparation for the actual printing process register marks, in German language use at Multi-color printing also register, on the substrate or the conveyor belt, in the called the following web, printed with a number of registration marks about the web and then the correct location of it is checked.
  • the control of the time at which the register marks of an impression cylinder or an intermediate carrier, one with a rubber blanket strung cylinder between the printing cylinder and the substrate the web being spawned is sometimes accomplished with clock counters.
  • the first one Calibration run the distances of the frames, hereinafter also called frames, of the register marks controlled on one web and on the other on a second Calibration run the distances between the individual register marks of a single one large frame, hereinafter also called large frame, same color separations from each other, for example the distance of the register mark for magenta one large frames to the register mark for magenta of the same large frame.
  • Frames of register marks consist of a defined constant Number of several individual register marks printed close together for individual color separations together.
  • a big frame unlike the previous frame, includes all register marks of the Calibration run and has exactly one beginning and one end.
  • a clock counter triggers the printing of the web during the calibration at the right time, so that the Register marks are applied to the web in good time.
  • the register marks are applied at equal intervals by a certain number of bars are determined in relation to the speed at which the printing the web with register marks after sending a trigger signal; this speed is essentially determined by the Speeds of the motor-driven web and those by friction driven pressure cylinder involved as well as intermediate carrier or intermediate drum.
  • the individual register marks are opened with constant clocks upset the web.
  • the term is defined by a cross to described surface, printing material or web, arranged row of pixels, the term area defines a multitude of lines.
  • Pressure causes the register marks to shift with the color separations printed on top of each other.
  • the aim is to do the above Concept for a printing press within a tolerance on the one hand error-free Spacing of the frames of register marks, from which error-free image starts follow individual color separations, and on the other hand error-free distances of individual same-colored register marks on the web, with which color shifts of areas or lines within the printed image avoided will provide.
  • two individual calibration runs required, a first calibration run to calibrate the frames and a second calibration run to calibrate of the individual register marks of the same color. Another problem is that the longer the calibration process, the greater the impact of other errors off, i.e. the robustness of the calibration process is reduced.
  • the object of the invention is to maintain register accuracy with a single calibration run guarantee.
  • FIG. 1 shows patterns of register frames or frames 7 for calibration purposes on a conveyor belt or web 50, which consist of two calibration marks 1, 2 and four register marks 3, 4, 5, 6, which are each assigned to a color in multi-color printing.
  • 1 shows error-free frames 7, the distances a of the individual register marks 3, 4, 5, 6 from one frame 7 to the next frame 7 are constant.
  • 1 shows only one frame 7 per arrangement of two calibration marks 1, 2 and register marks 3, 4, 5, 6. In fact, each register mark 3, 4, 5, 6 is assigned a frame 7.
  • the arrangement according to FIG. 1 ensures that the register is correct during the print following the calibration, the print begins at the desired start position and the color separations are exactly one above the other in order to obtain the desired print image.
  • FIG. 2 shows only one register mark 3 according to FIG.
  • FIG. 2 shows displacements of the frames 7 to one another on the web 50, the distances b, c, d of the register marks 3 of the frames 7 are unequal to one another and unequal to a according to FIG. 1.
  • the register arrangement according to FIG following the calibration process described here the print image of a color separation is applied to the printing material too early or too late and consequently to displacements of the respective color separation of the printing image on the printing material. The color separations are undesirable or are not in register with one another.
  • FIG. 2 shows displacements of the frames 7 to one another on the web 50, the distances b, c, d of the register marks 3 of the frames 7 are unequal to one another and unequal to a according to FIG. 1.
  • the register arrangement according to FIG following the calibration process described here the print image of a color separation is applied to the printing material too early or too late and consequently to displacements of the respective color separation of the printing image on the printing material. The color separations are undesirable or are not in register with one another.
  • FIG. 2 shows
  • FIG. 3 shows a section of a single large frame 8 on the web 50, in the lower illustration the distances of a single register mark 4 of the same color, which is repeated at certain intervals on the web 50, compared to that corresponding upper error-free representation are changed.
  • the change in the distances or shifts are designated with the variable distance e.
  • the other register marks 3, 5, 6 shift Similar to the register mark 4, the other register marks 3, 5, 6 shift, which are not shown in FIG. 3.
  • no simulation of an ordinary sheet is used, in this calibration process a very long sheet of paper is simulated on the web 50 with a single large frame 8, which is only partially shown and a start and an in the calibration run End.
  • Fig. 4 shows a schematic representation of a part of a printing module of a printing press with an imaging drum 30, on which there are concrete images during the printing process, and an intermediate drum 35 as an intermediate carrier for transferring the concrete image onto a printable surface, a conveyor belt or web 50, or printing material. Furthermore, a sensor 12 is provided in front of the printing modules in the vicinity of the web 50 for sending out a signal, which characterizes the detection of the front edge of a sheet during the pressure following the calibration process described. The sensor 12 is connected to a clock counter 10.
  • the clock counter 10 is connected to a rotary encoder 45, which detects the position of the web 50, a first register 25 and a clock divider 15.
  • the encoder 45 supplies signals to the clock counter 10, the first feedback circuit 27 and the second feedback circuit 22.
  • a first encoder 32 on the imaging drum 30 is connected to the clock divider 15, a first correction element 23 and a second correction element 28.
  • a second encoder 37 on the intermediate drum 35 is connected to a third correction element 24 and to a fourth correction element 29.
  • a register sensor 13 behind the print modules detects the register marks 3, 4, 5, 6 applied in the print modules and is connected to the first register 25 via a first feedback circuit 27.
  • a writing device 18 serves to apply a concrete image to the imaging drum 30 and comprises the devices necessary for this.
  • the writing device 18 is connected to a clock divider 15 and to the clock counter 10. Furthermore, a second register sends 20 clock division rates to the clock divider 15. Further devices of print modules, which are not directly related to the invention, are not shown for reasons of clarity. 4 shows only a single printing module for a single color, it is understandable that a separate printing module is required for each color, only a single sensor 12 being required in front of the printing modules, which is connected to a clock counter 10 of the individual printing modules, and a single register sensor 13 which is connected to the rotary encoder 45 and in each case to the feedback circuits 27 of the individual printing modules.
  • the writing device 18 applies calibration marks 1, 2 and register marks 3, 4, 5, 6 according to FIGS. 1-3 to the imaging drum 30 of the respective printing module, the four register marks 3, 4, 5, 6 and the two calibration marks 1, 2 are combined to form a frame 7; each color of a register mark 3, 4, 5, 6 is applied by a printing module.
  • the calibration marks 1, 2 serve the register sensor 13, but are not necessary for understanding the invention.
  • the register marks 3, 4, 5, 6 each identify a color, such as key or black, cyan, magenta or yellow, and are consequently applied in each case by one of four printing modules.
  • the web 50 moves in the direction of the arrow, ie the top of the web 50 moves from right to left and is driven by a stepper motor.
  • the imaging drum 30 and the intermediate drum 35 of the individual printing modules are driven by frictional engagement with the web 50.
  • the function of the imaging device according to FIG. 4 is as follows.
  • the sensor 12 outputs a signal to the clock counter 10 via a connecting line.
  • the signal is triggered by the detection of the front edge of a sheet at the pressure following the described calibration process; in the calibration run described here, the signal is generated regardless of the presence of a sheet.
  • the clock counter 10 After a certain time, the clock counter 10 generates a signal, the START OF FRAME signal, which is transmitted to the writing device 18 and causes the latter to provide the imaging drum 30 with the image of a register mark 3, 4, 5, 6.
  • the time that elapses between the signal from the sensor 12, which simulates the detection of the leading edge of the sheet, the application of the register marks 3, 4, 5, 6 to the imaging drum 30 by the writing device 18 and the transfer of the register marks 3, 4, 5 , 6 via the intermediate drum 35 onto the web 50 is ideally exactly the time in which the web 50 travels from below the sensor 12 to the contact surface or nip of the intermediate drum 35 with the imaging of the register marks 3, 4, 5, 6 back on the web 50.
  • error-free frames 7 ensure that the beginning of the image is applied in good time, ie the shifting of a color separation in the direction of travel of the sheet is avoided.
  • 2 shows a case in which there are displacements of the frames 7 and the distances b, c and d from one frame 7 to the next are not equal to a, the entire frame 7 is displaced in comparison to the adjacent frame 7.
  • each register mark 3, 4, 5, 6 is assigned its own frame 7, whereas in FIGS. 1 and 2 only a repeated frame 7 of a single register mark 3, 4, 5, 6 is shown. This means that each color has a frame 7, a START OF FRAME signal is generated for each color.
  • FIG. 2 shows displacements of the individual register marks 3, 4, 5, 6 of the same color with respect to one another, here the register mark 4 according to FIG. 1 by way of example.
  • FIGS. 2 and 3 represent different types of errors in register settings which are expediently calibrated in different ways . For this reason, two calibration runs have hitherto usually been used to calibrate the imaging device, the first calibration run serves to calibrate the frames 7 with respect to errors according to FIG.
  • the second calibration run serves to calibrate the individual register marks 3, 4, 5, 6 of the same color with respect to each other with respect to FIG in the case of a simulated large sheet with a single large frame 8.
  • the invention uses only one calibration run, but for the sake of understanding, two calibration runs are first described below before finally describing how one calibration run is used instead of two.
  • the calibration runs described largely correspond to the process during printing, in contrast to printing, data are recorded during the calibration run and the first register 25 and the second register 20 are fed with the data, during the subsequent printing process data are recorded, with the data from the first register 25 and second register 20 compared and deviations corrected.
  • START OF FRAME signals from sensor 12 simulate a number of individual sheets on web 50 onto which individual register frames or frames 7 are printed, one frame 7 for each START OF FRAME, each with a register mark 3, 4, 5 , 6, ie each register mark 3, 4, 5, 6 is assigned to a START OF FRAME.
  • the register sensor 13 detects the register marks 3, 4, 5, 6 and is connected to a rotary encoder 45 for detecting the position of the web 50. If the sensor 12 sends the START OF FRAME signal during the first calibration run, the position of the imaging drum 30 and the intermediate drum 35 are determined by the first encoder 32 and the second encoder 37 at this time.
  • position data are transmitted to the first correction element 23 and the second correction element 28.
  • the first correction element 23 is assigned to the second register 20
  • the second correction element 28 is assigned to the first register 25.
  • the second encoder 37 on the intermediate drum 35 detects the position of the intermediate drum 35 and sends the position data to a third correction element 24 and a fourth correction element 29.
  • the third correction element 24 is assigned to the second register 20, the fourth correction element 29 is the first Assigned to register 25.
  • the position data from the encoders 32, 37 each form a variable correction component, in contrast to a constant correction component, which are stored in the first constant memory 26 and in the second constant memory 21, respectively.
  • Correction data are calculated in the registers 20, 25 from variable and constant correction components and are converted into clocks.
  • the first register 25 is supplied with constant data from the first constant memory 26 as well as correction data which are calculated in the second correction element 28 and in the fourth correction element 29 from the position data of the encoders 32 and 37, respectively.
  • the first register 25 receives data from a feedback element 27, which is fed by the register sensor 13 and the rotary encoder 45.
  • the first register calculates 25 correction data from this data.
  • the START OF FRAME signal is generated at the pressure following the calibration process by supplying clocks assigned to the clock divider 10 from the correction data, which clock pulse then obtains the START OF FRAME signal for the start of a frame 7.
  • the START OF FRAME signal is simulated during the first calibration run.
  • the second calibration run is used to calibrate the individual register marks 3, 4, 5, 6 to one another, ie register marks 3, 4, 5, 6 of the same size of a large frame 8 according to FIG. 3.
  • the term large frame 8 describes one Arrangement of register marks 3, 4, 5, 6, which includes all register marks 3, 4, 5, 6 and has a single start and end.
  • the distance between identical register marks 3, 4, 5, 6, eg register mark cyan to register mark cyan, within a large frame 8 is also referred to as magnification.
  • a calibration run with an endless sheet is simulated, ie no signal is generated by the sensor 12 to simulate the leading edge of an sheet.
  • a second register 20 is available, which, as described above, receives data from a second constant memory 22 which contains constant data without the influence of errors.
  • a first correction element 23 is available, which receives position data from the first encoder 32, and a third correction element 24, which receives position data from the second encoder 37. In this way, the current positions with respect to segments of the imaging drum 30 and the intermediate drum 35 are observed during the imaging.
  • the second register 20 receives data from the rotary encoder 45 via a second feedback element 22.
  • the data from the rotary encoder 45 describe the rotation of the rotary encoder 45 and consequently the travel of the web 50.
  • the second register receives 20 no data from the register sensor 13.
  • the data obtained are subjected to calculations in the second register 20, among other things the position data of the first encoder 32 are compared with the data of the rotary encoder 45 to determine the shift of the magnification, the calculated data are compared in an assignment table or look up table assigned to a cycle number and saved.
  • the clock divider 15 receives the START OF FRAME signal.
  • a START OF LINE signal is generated from the START OF FRAME signal and the signal from the second register 20, which triggers the application of the register marks 3, 4, 5, 6 during the second calibration run.
  • the START OF LINE signal is transmitted to the writing device 18 and causes the writing device 18 to apply a toner image to a line of the imaging drum 30, depending on the imaging data of the writing device 18.
  • the following START OF LINE signal causes the next line to point to the Imaging drum 30 is written. This process is carried out for each register mark 3 to 6 in the individual printing modules. Furthermore, the use of the clock divider 15 reduces errors in the imaging device.
  • the invention discloses a possibility that the above described two calibration runs, which take up valuable machine runtime and are not robust to other errors, to be replaced by a single calibration run.
  • the first calibration run is carried out with the generation of the START OF FRAME signal, as described above.
  • the correction data of the first register 25 are converted in a suitable manner in a computer unit 60 and then serve as correction data of the second register 20, as shown in FIG. 5.
  • the second calibration run is omitted.
  • the conversion in the computer unit 60 is as follows.
  • the position with respect to a segment of the imaging drum 30 is determined at the point in time at which a specific line with a specific line number is generated on the imaging drum 30, advantageously with the START OF LINE signal.
  • the position at which the determined line is detected by the register sensor 13 is also determined.
  • the data calculated in the computer unit 60 which ultimately serve to generate the START OF LINE signal, result from the difference between the position of the specific line detected by the register sensor 12 and a target position of the specific line, which results from the position of the imaging drum 30 during writing the particular line calculated on the web 10.
  • the computer unit 60 transmits the calculated data to the first correction element 23 and to the third correction element 24, which in each case calculate correction data in accordance with the above description and transmit it to the second register 20.
  • the rest of the procedure is as described under Fig. 4.
  • the variant according to FIG. 5 saves the second calibration run; a single calibration run in which the imaging device simulates a sequence of successive sheets, each with a frame 7 per printing module or color, is sufficient to correct the errors described above. This variant also reduces errors in the second calibration run.
  • the error history of the START OF FRAME error is shown with and without further errors.
  • 6 shows the periodic sinusoidal course of the START OF FRAME error as a function of time t .
  • the distance s indicates the maximum error of the START OF FRAME signal.
  • a sheet of printing material is shown with dashed lines.
  • the START OF FRAME signal is sent at the marking according to FIG. 6 on the left edge of the dashed sheet, the error s denotes the shift of the frame of a complete color separation, the corresponding color separation is shifted by the length s.
  • FIG. 7 shows the course of the error according to FIG. 6, the course of the error being shown in dashed lines.
  • the START OF FRAME error with a drift influence is shown as a further error with a solid line.
  • the drift error in contrast to the existing error of the START OF FRAME, is designated with the length f , the length t denotes the added error of the START OF FRAME with the drift error, which increases over time, as can be seen.
  • the drift influence is felt after a few passes of the printing press and leads to further errors in the subsequent print image.
  • the influence of drift does not occur after only a few oscillations, as shown in FIG. 7, but only after some time, the origin of the coordinate system according to FIG. 7 is consequently t not equal to zero.
  • the drift in the original error curve of the START OF FRAME signal is independent of this and also of the START OF LINE signal.
  • the method relating to the invention of determining both types of errors, errors of the START OF FRAME and the START OF LINE, with a calibration run prevents the drift influences from falsifying the measurements and ultimately leading to incorrect correction data.
  • the invention is Calibration run already completed, while the drift influence at two individual calibration runs at least during the second calibration run Errors.
  • the START OF LINE error behaves similarly to FIGS. 6 and 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
EP02006045A 2001-08-09 2002-03-16 Procédé et dispositif d'imagerie d'ajustement de repérage Withdrawn EP1285758A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10139310A DE10139310B4 (de) 2001-08-09 2001-08-09 Verfahren zum Ermitteln von START OF FRAME-Korrekturdaten und START OF LINE-Korrekturdaten zur Registereinstellung für Druckmaschinen beim Mehrfarbdruck
DE10139310 2001-08-09

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Publication Number Publication Date
EP1285758A1 true EP1285758A1 (fr) 2003-02-26

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EP02006045A Withdrawn EP1285758A1 (fr) 2001-08-09 2002-03-16 Procédé et dispositif d'imagerie d'ajustement de repérage

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US (1) US6817295B2 (fr)
EP (1) EP1285758A1 (fr)
JP (1) JP2003112411A (fr)
DE (1) DE10139310B4 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP1341054A1 (fr) * 2002-02-27 2003-09-03 NexPress Solutions LLC Méthode et dispositif de commande pour éviter des défauts de repérage
WO2007057392A1 (fr) * 2005-11-16 2007-05-24 Siemens Aktiengesellschaft Reglage de registre dans une machine d'impression

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US6848361B2 (en) * 2002-01-18 2005-02-01 Eastman Kodak Company Control device and method to prevent register errors
DE10304763A1 (de) * 2003-02-05 2004-08-26 Nexpress Solutions Llc Verfahren zur Korrektur der Kalibrierung eines passergenauen Druckprozesses
CN100426319C (zh) * 2003-03-17 2008-10-15 上海力保科技有限公司 数码冲印均匀度校正方法
DE102004007069A1 (de) * 2004-02-13 2005-08-25 Goss International Montataire S.A. Rotationselement einer Druckmaschine, mit einem Encoder
DE102004007367A1 (de) * 2004-02-16 2005-09-15 Nexpress Solutions Llc Verfahren und Druckmaschine zum Erfassen von Marken
DE102005007435A1 (de) * 2005-02-18 2006-08-24 Bosch Rexroth Ag Verfahren zum Durchführen einer Druckkorrektur und Vorrichtung hierfür
DE102007041393B4 (de) 2007-08-31 2010-12-16 Eastman Kodak Co. Verfahren zum Kalibrieren einer Mehrfarben-Druckmaschine
DE102008016456B4 (de) * 2008-03-31 2011-04-28 Eastman Kodak Company Verfahren zum Überprüfen einer Funktionalität einer Mehrfarbendruckmaschine
CN104516863B (zh) * 2013-09-27 2018-01-26 北大方正集团有限公司 添加裁切标记的装置和添加裁切标记的方法
JP2016078453A (ja) * 2014-10-16 2016-05-16 ミュラー・マルティニ・ホルディング・アクチエンゲゼルシヤフト 印刷品を作製する方法
US11822262B2 (en) 2021-09-28 2023-11-21 Eastman Kodak Company Registration of white toner using sensing system with colored reflector plate
US11829084B2 (en) 2021-09-28 2023-11-28 Eastman Kodak Company Registration of white toner in an electrophotographic printer

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US5974967A (en) * 1998-08-27 1999-11-02 Lenticulartechnologies, L.L.C. Registration system for lenticular printing
EP1157837A2 (fr) * 2000-05-17 2001-11-28 NexPress Solutions LLC Procédé et dispositif pour la mise en repérage dans une presse multicolor

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US5287162A (en) * 1992-06-16 1994-02-15 Xerox Corporation Method and apparatus for correction of color registration errors
EP0770480B1 (fr) * 1995-10-25 2001-12-19 Heidelberger Druckmaschinen Aktiengesellschaft Presse à imprimer digitale avec contrôle de registre
US6304825B1 (en) * 1999-01-19 2001-10-16 Xerox Corporation Rotary encoder error compensation system and method for photoreceptor surface motion sensing and control
JP2001083762A (ja) * 1999-09-09 2001-03-30 Canon Inc 多色画像形成装置

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US5974967A (en) * 1998-08-27 1999-11-02 Lenticulartechnologies, L.L.C. Registration system for lenticular printing
EP1157837A2 (fr) * 2000-05-17 2001-11-28 NexPress Solutions LLC Procédé et dispositif pour la mise en repérage dans une presse multicolor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1341054A1 (fr) * 2002-02-27 2003-09-03 NexPress Solutions LLC Méthode et dispositif de commande pour éviter des défauts de repérage
WO2007057392A1 (fr) * 2005-11-16 2007-05-24 Siemens Aktiengesellschaft Reglage de registre dans une machine d'impression
US8279485B2 (en) 2005-11-16 2012-10-02 Siemens Aktiengesellschaft Register regulation in a printing press

Also Published As

Publication number Publication date
US6817295B2 (en) 2004-11-16
DE10139310B4 (de) 2010-11-25
US20030029341A1 (en) 2003-02-13
DE10139310A1 (de) 2003-03-06
JP2003112411A (ja) 2003-04-15

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