EP1156381A2 - Méthode et appareil pour la correction des erreurs de registration dans une imprimante couleur - Google Patents

Méthode et appareil pour la correction des erreurs de registration dans une imprimante couleur Download PDF

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Publication number
EP1156381A2
EP1156381A2 EP01109090A EP01109090A EP1156381A2 EP 1156381 A2 EP1156381 A2 EP 1156381A2 EP 01109090 A EP01109090 A EP 01109090A EP 01109090 A EP01109090 A EP 01109090A EP 1156381 A2 EP1156381 A2 EP 1156381A2
Authority
EP
European Patent Office
Prior art keywords
correction values
color images
image
partial color
errors
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Withdrawn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
EP01109090A
Other languages
German (de)
English (en)
Other versions
EP1156381A3 (fr
Inventor
Heiko Hunold
Patrick Dr. Metzler
Karlheinz Dr. Peter
Donald Buch
Michael Kowalczyk
Christopher Liston
Robert Peffer
Michael Gerard Thompson
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 EP1156381A2 publication Critical patent/EP1156381A2/fr
Publication of EP1156381A3 publication Critical patent/EP1156381A3/fr
Withdrawn legal-status Critical Current

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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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
    • G03G15/0194—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to the final recording medium
    • 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
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points
    • 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
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0151—Apparatus for electrophotographic processes for producing multicoloured copies characterised by the technical problem
    • G03G2215/0158—Colour registration
    • G03G2215/0161—Generation of registration marks

Definitions

  • the invention relates to a method for correcting register errors in a Multi-color printing machine with several devices for the digital generation of Partial color images, whereby correction values are determined and the angular positions at least assigned to an image cylinder and thereby for controlling the generation of the partial color images be taken into account on the latter.
  • the invention further relates to a device for correcting register errors according to the above-mentioned method, wherein the multi-color printing machine several Devices for the digital generation of partial color images, at least one controller to control the same and at least one memory in which data for Determination of the correction values assigned to the angular positions of image cylinders are saved.
  • Register errors are predominant caused by out-of-roundness of machine elements that transmit image or substrate.
  • non-roundness of other machine elements such as image transfer cylinders or the drive roller of the substrate of printing substrates added, they can no longer because of the prior art mentioned be directly assigned to the angular positions of image cylinders, since these Do not turn machine elements absolutely simultaneously to the image cylinders. At a such simultaneous rotation is absent even when the diameters are on top of each other are coordinated since phenomena such as slip and overdrive occur.
  • Overdrive is called faster cylinder rotation - where one cylinder is the other drives -, in relation to a rolling of rigid cylinders. This is due to the Compression of an elastic jacket in the contact area of the cylinders. Slip can occur especially when one machine element is driven by another is, for example, an image transfer cylinder through the substrate for printing substrates and this in turn by the drive roller. The image cylinder can also be moved through the Carrier or driven by the image transfer cylinder. To yourself repetitive errors periodically with the rotation of a machine element register changes also make non-periodic changes such as tripping, e.g. B. by temperature changes, although their assignment to periodic Angular positions are not given. This in turn complicates an analysis of the Total errors recorded.
  • tripping e.g. B. by temperature changes
  • the printing of register marks is also complex, especially for the assignment to Continuous printing of registration marks is required at all angular positions Angular positions and combinations of angular positions of all that influence the register Includes machine elements.
  • the accuracy of the angular positions assigned calibration tables by the resolution accuracy of the printed register marks limited and thus an accurate correction for finely divided areas of the Partial color images not possible.
  • the invention is therefore based on the object of correcting values for correcting To make register errors available, the angular positions of Machine elements can be assigned in a repeatable manner.
  • the object is achieved according to the invention in that Concentricity errors of machine elements that affect the register, determined, assigned to their angular positions and from this the correction values for the Control of the generation of the partial color images on the at least one image cylinder be determined.
  • the object is achieved according to the invention in that the Correction values due to concentricity errors of machine elements, which Have influence on the register, are determined by the at least one controller is designed in such a way that it maps the runout errors to the angular positions of the machine elements on the angular positions of the at least one image cylinder related correction values for the control of the generation of the partial color images determined on the at least one image cylinder.
  • the advantage of the invention is that the main sources of error that arise Out of roundness are based, can be precisely assigned to the machine elements that they are Show roundness. In this way, the errors with their periodic Repetition with the angular positions of the element in question can be detected and it is possible to control the imaging of the image cylinders in such a way that these errors be compensated. So if the beginning of the image or areas of a partial color image the image cylinder are generated, so the control of the image generation "knows" the Errors with their periodicities and can control the image generation in such a way that the errors in the run-up to the image generation by means of compensation, for example by stretching or compressing is counteracted by image components.
  • the invention does not require the printing of register marks because of the out-of-roundness are detectable in other ways and in such a way that no mixing with errors different periodicity or with errors without periodicity.
  • he can Printing of register marks, the acquisition of image beginnings or image components in addition to make further corrections.
  • the devices for generating the partial color images can generate these on a single or on a respective image cylinder.
  • the transfer the partial color images can then be from the one or more image cylinders take place directly on the substrate or further transmission elements can be provided be those that are already superimposed or the individual partial color images transmitted separately.
  • the partial color images can already be on an image cylinder be placed one on top of the other or only when transferred to the print substrate or on the way there on a transmission element.
  • the design is based on these transmission paths and transmission elements the invention with respect to the runout errors to be taken into account. So can it should be provided that the runout errors of the image cylinders for determining the correction values be determined. For multi-color printing machines with image transfer cylinders it can be provided that their runout errors are also used to determine the correction values determined and thus for the control of the generation of the partial color images the image cylinders are taken into account. Furthermore, the runout errors of the Drive role of a carrier for printing substrates detected and in the determination of Correction values for the control of the generation of the partial color images on the image cylinders be taken into account. Regarding the device for performing this Process steps are then sensors for detecting these runout errors as well at least one controller is provided that calculates the correction values. On closer Refinements are still being discussed.
  • determining runout errors There are various options for determining runout errors. It can be provided that the concentricity errors by direct measurement on the concerned Machine element can be determined. However, it is also possible that the angular positions of the machine elements which have an influence on the register, and the concentricity errors determined from the mutual assignment of the angular positions become. With regard to the device it is then provided that devices for Determination of concentricity errors and their assignment to the angular positions provided are. These can be sensors for detecting runout errors or it is possible that the devices are rotary encoders which are connected to a computer which is designed such that it concentricity errors and thus the correction values from the mutual assignment of the angular positions of the machine elements determined. Because the concentricity errors with the associated angular positions detected, it concerns the effective runout errors with inclusion of slip, overdrive or similar phenomena.
  • the correction values can only be provided for the beginning of the image in order to achieve this A high precision of the prints, however, it is proposed that the correction values assigned to defined areas of the partial color images and taken into account for their generation become.
  • the partial color images can be single or Act groups of picture lines. It is preferably provided that the defined Areas of the partial color images by assigning image areas to defined ones Angular sequences of the image cylinders are determined. Regarding the device provided that the at least one controller is designed such that it Correction values for defined areas of the partial color images when they are generated considered.
  • correction values it can be provided that they are recorded once and as machine-specific parameters are taken into account.
  • the device provided that the at least one memory the runout with their assignment to the angular positions as machine-specific nominal values contains.
  • the correction values can also be recorded before and for a print Pressure are taken into account. It can be a new determination of the correction values act or it is possible to correct the machine-specific parameters to make. Of course, the correction values can also be continuously recorded and be taken into account. It is through continuous redefinition of correction values in particular, it is also possible to drift the values caused, for example, by changes of temperature and voltages in the machine, by constantly updating the correction values.
  • the aforementioned acquisition of the data and determination of correction values for the The control system already runs without checking by printing register marks or similar control fields for a good result and a high register accuracy. This is particularly advantageous because such register corrections are very much can be carried out quickly.
  • the invention does not rule out that the correction values are checked by printing and capturing partial color images and corrected if necessary. These partial color images can be Trial prints of the beginning of images or trial prints of other defined areas about part-color images. Of course, as trial prints by Partial color images also printed register marks and evaluated accordingly.
  • the device there is then at least one sensor for recording test prints provided as well as an evaluation device, the test prints, for example Register marks, evaluated for checking and correcting the correction values.
  • a multicolor printing machine is shown, of which usual four or more printing units only two printing units 25, 25 'shown were. This serves to simplify, additional printing units must be considered become.
  • Each printing unit 25, 25 ', ... has a device 2, 2', ... for digital Generation of partial color images 3, 3 ', .... These devices 2, 2 ', ... are on Image cylinders 5, 5 ', ... arranged.
  • the partial color images 3, 3 ', ... are initially from the image cylinders 5, 5 ', ... on image transfer cylinders 7, 7'; ... transferred to then to be transferred from the latter to printing substrates 12.
  • the printing substrates 12 are located on a carrier 11, which is driven by a drive roller 10 and the printing substrates 12 are moved in the transport direction 27.
  • a carrier 11 which is driven by a drive roller 10 and the printing substrates 12 are moved in the transport direction 27.
  • On the Image transfer cylinders 7, 7 ', ... opposite side of the carrier 11 counter pressure rollers, which have been omitted for simplification.
  • the controls 17, 17 ', ... must be supplied with data which the Assignment of the printing units 25, 25 ', ... to one another and the transmission paths of the Partial color images 3, 3 ', ... include.
  • correction data which non-roundness of Machine elements, such as image cylinders 5, 5 ', ..., image transfer cylinders 7, 7 ', ... or the drive roller 10.
  • Other data can be other Contain sources of error that influence the accuracy of the register.
  • the above Data and the correction data can be machine-specific nominal values 19, 19 ', ... be stored in memories 18, 18 ', ... This filing of machine specific Nominal values 19, 19 ', ... can be done by the machine manufacturer or it is possible these machine-specific nominal values 19, 19 ', ... temporarily or continuously To update.
  • the angle encoder 21 the angular positions 4, 4 ', ...; 13, 13 ', ...; 14 all on the register Influencing machine elements 5, 5 ', ...; 7, 7 ', ...; 10 measure and calculator 22, 22 ', ... the runout errors 6, 6', ...; 8, 8 ', ...; 9 and thus the correction values from the mutual assignment of the angular positions 4, 4 ', ...; 13, 13 ', ...; 14 calculate.
  • angle encoder 21 are the image cylinders 5, 5 ', ..., the image transfer cylinders 7, 7 ', ... and the drive roller 10 assigned.
  • Each printing unit 25, 25 ', ... is equipped with a computer 22, 22 ', ..., each with the controls 17, 17 ', ... the printing units 25, 25', ... is connected. With this data, too Controls 17, 17 ', ... control the imaging of the image cylinders 5, 5', ... and possibly update the machine-specific nominal values 19, 19 ', ... for the next print.
  • the illustration further shows how the printing substrate 12 still in front of the printing unit 25 contains no partial color image and the partial color images 3, 3 ', ... by the printing units 25, 25 'are applied to the printing substrates 12. Therefore contains the middle one Print substrate 12 a partial color image 3 and the left print substrate 12 two partial color images 3 and 3 '. In this way, four partial color images 3, 3 ', ... are usually applied to the printing substrates 12 by four printing units 25, 25 ',.
  • the image width 16 is drawn on the right printing substrate 12 to show that it is possible to record the above-mentioned data over the entire image width 16, for example to calculate an average value that is then used to control the Generation of partial color images 3, 3 ', ... is used as a basis.
  • the connections of the Individual elements are shown with links and arrows for the data flow.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Color Electrophotography (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Color, Gradation (AREA)
EP01109090A 2000-05-17 2001-04-12 Méthode et appareil pour la correction des erreurs de registration dans une imprimante couleur Withdrawn EP1156381A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US20468000P 2000-05-17 2000-05-17
US204680P 2000-05-17

Publications (2)

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EP1156381A2 true EP1156381A2 (fr) 2001-11-21
EP1156381A3 EP1156381A3 (fr) 2005-03-23

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EP01109090A Withdrawn EP1156381A3 (fr) 2000-05-17 2001-04-12 Méthode et appareil pour la correction des erreurs de registration dans une imprimante couleur

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EP (1) EP1156381A3 (fr)
JP (1) JP2002014510A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009773A1 (de) * 2006-03-01 2007-09-06 Eastman Kodak Co. Verfahren zum Vermeiden eines Passerfehlers beim Drucken
CN111204144A (zh) * 2019-12-23 2020-05-29 江西沃格光电股份有限公司深圳分公司 印刷方法和装置、电子设备、计算机可读存储介质

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287162A (en) 1992-06-16 1994-02-15 Xerox Corporation Method and apparatus for correction of color registration errors

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB426910A (en) * 1934-07-23 1935-04-11 Leslie Thomas Albert Robinson Improvements in or relating to printing and other like machines
JPS6072731A (ja) * 1983-09-30 1985-04-24 Dainippon Printing Co Ltd 色間見当プリセツト装置
DE19847666B4 (de) * 1998-10-15 2005-10-20 Eltromat Gmbh Vorrichtung und Verfahren zur Registerregelung einer Druckmaschine beim Mehrfarbendruck

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287162A (en) 1992-06-16 1994-02-15 Xerox Corporation Method and apparatus for correction of color registration errors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009773A1 (de) * 2006-03-01 2007-09-06 Eastman Kodak Co. Verfahren zum Vermeiden eines Passerfehlers beim Drucken
CN111204144A (zh) * 2019-12-23 2020-05-29 江西沃格光电股份有限公司深圳分公司 印刷方法和装置、电子设备、计算机可读存储介质

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Publication number Publication date
EP1156381A3 (fr) 2005-03-23
JP2002014510A (ja) 2002-01-18

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