EP2727730B1 - Procédé de réglage de la couleur dans une imprimante offset - Google Patents

Procédé de réglage de la couleur dans une imprimante offset Download PDF

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Publication number
EP2727730B1
EP2727730B1 EP14152039.5A EP14152039A EP2727730B1 EP 2727730 B1 EP2727730 B1 EP 2727730B1 EP 14152039 A EP14152039 A EP 14152039A EP 2727730 B1 EP2727730 B1 EP 2727730B1
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EP
European Patent Office
Prior art keywords
ink
measured
camera
actual values
measurement
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.)
Active
Application number
EP14152039.5A
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German (de)
English (en)
Other versions
EP2727730A1 (fr
Inventor
Michael Schönert
Alfons Schuster
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.)
Manroland Web Systems GmbH
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Manroland Web Systems GmbH
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Publication of EP2727730A1 publication Critical patent/EP2727730A1/fr
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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
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • 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
    • B41P2233/51—Marks on printed material for colour quality control
    • 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 controlling the coloring in an offset printing press according to the preamble of claim 1.
  • each printing unit When printing a substrate is successively moved through several printing units of a printing press, wherein in each printing unit usually a printing ink is applied to the substrate.
  • the four scale colors black, magenta, cyan and yellow and, if appropriate, spot colors are generally printed, with a separate printing unit and therefore inking unit being present for each of these printing inks.
  • the inking unit of each printing unit has a Farbdosier driving, wherein the Farbdosier immunity comprises a number of ink zones corresponding number of Farbzonenstellelementen.
  • the Farbzonenstellelemente are also referred to as a color slider or color meter.
  • the color design of a printed product to be printed is set in a so-called pre-press.
  • so-called area coverage values are defined for each ink zone to be printed and thus for all inking units of the printing machine involved in the printing for each color zone.
  • the ink zone setting elements are adjusted and thus the zonal coloration is determined.
  • the present invention is based on the problem to provide a novel method for controlling the color in an offset printing machine.
  • color density actual values determined for the compensation of scattered light effects during the measurement of the measuring ranges are corrected using image data of the measuring ranges and using data on the optics of the camera.
  • color density actual values for controlling the zonal coloration are determined by measuring color register marks, which are usually measured to determine actual values for a color register control, by means of a camera. It is then dispensed with separate pressure control elements for determining color density actual values. Rather, the color density actual values are then detected by measuring the color register marks.
  • the color register marks are typically relatively small, dot-shaped or rectangular print control elements having a size between 0.5 mm and 2 mm. Since color register marks are relatively small print control elements, it is important to compensate for scattered light effects when determining color density actual values by measuring color register marks.
  • the present invention relates to a method for controlling the color in at least one inking unit of an offset printing machine, namely for controlling the adjustable by Farbzonenstellelemente the respective inking zonal coloring.
  • measuring ranges of a printed printing material are measured with the aid of a camera and color density actual values determined are compared with predetermined color density nominal values in order to generate actuating signals for the ink zone setting elements of the respective inking unit, depending on the comparison between the actual color density values and the color density setpoints.
  • pressure control elements of the printing material which are printed on the printing material outside of the actual subject are measured as measuring ranges for determining color density actual values.
  • Color register marks are preferably color register marks. Color density actual values are then recorded by measuring color register marks by means of a camera.
  • the color register marks serve not only to provide actual values for color register control but, according to the invention, also to provide actual values for controlling the zonal coloration.
  • the color register marks continue to serve to provide actual values for cut-off register control.
  • the color register marks can be supplemented by rastered fields of the same size.
  • color register marks printed on the printing substrate outside the subject are detected in a metrological manner such that they supply actual values for color register control and for cutting register control and for controlling the zonal coloration.
  • the number of print control elements that are printed on a substrate outside of the actual subject can be reduced to an absolute minimum, so that even in newspaper printing, in which no trimming of printed copies occurs, the pressure control elements are perceived as not disturbing.
  • the control of the zonal color scheme is such that for those color zones within which a color register mark lies, the color density actual value for color control determined in the color register mark is measured in the respective color registration mark Color zone is used.
  • the corresponding color density actual value is determined using an interpolation between the color density actual values determined during measurement of the register marks or by derivation from zonal presetting values of these color zones in combination with color density actual values. If appropriate, empirically obtained correction values can be taken into account from previous printing processes. However, such color register marks may also be present in each color zone.
  • the measurement of the color register marks for the metrological detection of color density actual values takes place with the aid of a camera, wherein the camera is preferably a CCD camera or CMOS camera.
  • the camera is preferably a CCD camera or CMOS camera.
  • a color camera with white illumination of the substrate or a black and white camera with colored illumination of the substrate can be used.
  • the field of view of the camera used captures at least one to be measured color register mark completely.
  • the color register marks are relatively small, dot-shaped or rectangular print control elements, which typically have a diameter or size between 0.5 mm and 2 mm.
  • a compensation of scattered light effects is carried out in the measurement of the register marks for determining the color density actual values.
  • Fig. 1 and 2 each show a field of view 10 of a camera schematized, wherein in the field of view 10 four punctiform Farbregistermarken 11, 12, 13 and 14 are.
  • a first step see Fig. 1
  • the entire field of view 10 of the camera is illuminated areally.
  • the position of the color register marks 11, 12, 13 and 14 is determined, and then in a second step (see Fig. 2 ) are illuminated depending on the position of the Farbregistermarken 11, 12, 13 and 14, only those portions of the field of view 10 of the camera, within which the Farbregistermarken 11, 12, 13 and 14 are located.
  • the first step primarily serves to determine the position of the color register marks, furthermore, measured values of the color register marks determined in the first step can be used as actual values for color register control and / or cut register control.
  • measured values of the color register marks are used as actual values for controlling the zonal coloration.
  • the determination of the position of the color register marks in the first step can be carried out using known image processing techniques, e.g. By segmentation and feature extraction, or using cross-correlation techniques.
  • one and the same source of illumination can be used, which then has to be designed to be switchable over a wide area.
  • a surface switchable illumination source In the beam path of such a surface switchable illumination source is at least one switchable element, which either transmits or blocks radiation depending on the switching state or refelcted or reflected at different angles.
  • the or each switchable element of the camera is permeable or in employment
  • the second step in which the field of view of the camera is illuminated exclusively in those sections in which the color register marks, however, at least one of the switchable elements is impermeable or in exhibition.
  • the full-surface illumination of the field of view of the camera in the first step and the selective illumination of the field of view in the second step can also be realized by using different illumination sources.
  • the correction of metrologically recorded color density actual values using an angle-independent correction factor and an angle-dependent correction factor is based on the finding that in a camera a measurement location 16 and a background 15 are imaged and scattered by an optical system 17 of the camera.
  • a light beam is scattered at the optics 17 and gives an offset 20 decreasing in intensity with the scattering angle which is greatest at an edge of a color register mark to be measured.
  • an angle-dependent correction factor that depends on the size of the color register mark can be determined.
  • the angle-independent correction factor and the angle-dependent correction factor are then used to correct color register marks for metrologically recorded color density actual values.
  • the edge produced by covering the full-tone field with a white element is examined in more detail, with a curve fit being carried out by means of a least square fit for the color-independent actual values corrected for angle.
  • the radius of the pressure control element is to be used here for x.
  • the above-described correction of scattered light effects can also be used if sections of the actual subject of the printed printing material are measured as measured objects.
  • the spatially resolved lighting according to Fig. 1 and 2 Use, in which case the subject can be illuminated with white light and metrologically recorded RGB values can be converted into LAB values using a Bradford matrix.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Spectrometry And Color Measurement (AREA)

Claims (14)

  1. Procédé de réglage de la couleur dans au moins un groupe d'encrage d'une imprimante offset, à savoir de réglage de la couleur zonale réglable par des éléments de positionnement de zones colorées et de préférence un rouleau ducteur et un rouleau preneur ou un rouleau à film du groupe d'encrage respectif, dans lequel, pour ce faire, des zones de mesure d'un support d'impression imprimé sont mesurées à l'aide d'une caméra et les valeurs réelles d'intensité de couleur alors déterminées sont comparées à des valeurs théoriques d'intensité de couleur pour, indépendamment de la comparaison, générer entre les valeurs réelles et les valeurs théoriques des signaux de positionnement pour les éléments de positionnement de zones colorées et, le cas échéant, le rouleau ducteur et le rouleau preneur ou le rouleau à film, caractérisé en ce que, pour compenser les effets de lumière dispersée, les valeurs réelles d'intensité de couleur déterminées lors de la mesure des zones de mesure sont corrigées en utilisant des données graphiques et en utilisant des données qui sont corrigées via l'optique de la caméra.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on mesure en tant que zones de mesure des éléments de contrôle d'impression d'un support d'impression imprimé qui sont imprimés en dehors du sujet proprement dit sur le support d'impression.
  3. Procédé selon la revendication 1, caractérisé en ce qu'on mesure en tant que zones de mesure des segments du sujet proprement dit.
  4. Procédé selon une des revendications 1 à 3, caractérisé en ce qu'on détermine alors une correction indépendante de l'angle et une correction dépendante de l'angle qu'on utilise pour corriger les valeurs réelles d'intensité de couleur déterminées lors de la mesure des marques de registre de couleur.
  5. Procédé selon une des revendications 1 à 4, caractérisé en ce que, pour compenser les effets de lumière dispersée, dans une première étape, on éclaire en surface le champ visuel de la caméra et que, dans une seconde étape, on n'éclaire que les segments du champ visuel de la caméra dans lesquels il y a des zones de mesure pour enregistrer les valeurs réelles d'intensité de couleur.
  6. Procédé selon la revendication 5, caractérisé en ce qu'on utilise comme zones de mesure des éléments de contrôle d'impression d'un support d'impression imprimé qui sont imprimés en dehors du sujet proprement dit sur le support d'impression.
  7. Procédé selon la revendication 5, caractérisé en ce qu'on utilise comme zones de mesure des segments du sujet proprement dit.
  8. Procédé selon une des revendications 5 à 7, caractérisé en ce que, pour éclairer en surface et partiellement le champ visuel de la caméra, on utilise une seule source d'éclairage activable en surface.
  9. Procédé selon une des revendications 5 à 8, caractérisé en ce que, pour éclairer en surface et partiellement le champ visuel de la caméra, on utilise différentes sources d'éclairage.
  10. Procédé selon une des revendications 1 à 9, caractérisé en ce qu'on utilise comme éléments de contrôle d'impression des marques de registre de couleur pour déterminer les valeurs réelles d'intensité de couleur.
  11. Procédé selon la revendication 10, caractérisé en ce que les marques de registre de couleurs permettant le réglage du registre de couleur et le réglage de la couleur zonale sont mesurées et que les marques de registre de couleur continuent de préférence à être mesurées pour régler le registre de coupe.
  12. Procédé selon la revendication 10 ou 11, caractérisé en ce que, pour les zones colorées dans lesquelles se trouve une marque de registre de couleur, la valeur déterminée lors de la mesure de la marque de registre de couleur est utilisée pour régler la couleur zonale de la zone colorée respective.
  13. Procédé selon la revendication 12, caractérisé en ce que, pour les zones colorées dans lesquelles ne se trouve pas de marque de registre de couleur, la valeur réelle d'intensité de couleur est déterminée en fonction d'une interpolation entre l'intensité de couleur déterminée lors de la mesure de la marque de registre de couleur ou par déduction de préréglages de zones en combinaison avec des valeurs réelles d'intensité de couleur.
  14. Procédé selon une des revendications 10 à 13, caractérisé en ce que, en plus des marques de registre de couleur, des champs de quadrillage de même forme sont mesurés et des valeurs de mesure sont utilisées pour régler et éventuellement compenser les effets de lumière dispersée.
EP14152039.5A 2007-12-12 2008-12-08 Procédé de réglage de la couleur dans une imprimante offset Active EP2727730B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710059842 DE102007059842A1 (de) 2007-12-12 2007-12-12 Verfahren zur Regelung der Farbgebung in einer Offsetdruckmaschine
EP20080170965 EP2070701B1 (fr) 2007-12-12 2008-12-08 Procédé de réglage de la couleur dans une imprimante offset

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP20080170965 Division EP2070701B1 (fr) 2007-12-12 2008-12-08 Procédé de réglage de la couleur dans une imprimante offset
EP20080170965 Division-Into EP2070701B1 (fr) 2007-12-12 2008-12-08 Procédé de réglage de la couleur dans une imprimante offset

Publications (2)

Publication Number Publication Date
EP2727730A1 EP2727730A1 (fr) 2014-05-07
EP2727730B1 true EP2727730B1 (fr) 2015-02-11

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP20080170965 Active EP2070701B1 (fr) 2007-12-12 2008-12-08 Procédé de réglage de la couleur dans une imprimante offset
EP14152039.5A Active EP2727730B1 (fr) 2007-12-12 2008-12-08 Procédé de réglage de la couleur dans une imprimante offset

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20080170965 Active EP2070701B1 (fr) 2007-12-12 2008-12-08 Procédé de réglage de la couleur dans une imprimante offset

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EP (2) EP2070701B1 (fr)
DE (1) DE102007059842A1 (fr)
ES (1) ES2513823T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011050286U1 (de) * 2011-05-30 2012-09-06 Eltromat Gmbh Druckmaschine mit Registermarkensensor
DE102013109920A1 (de) * 2013-09-10 2015-03-12 Manroland Web Systems Gmbh Verfahren zum Bedrucken eines Bedruckstoffs
DE102015109412A1 (de) 2015-06-12 2016-12-15 Manroland Web Systems Gmbh Registerhaltiges Bedrucken transparenter Substrate
DE102016100437B4 (de) 2016-01-12 2018-08-02 Stephan Krebs Vorrichtung zur Druckbildkontrolle
DE102016107745A1 (de) * 2016-04-26 2017-10-26 CONPRINTA GmbH & Co. KG Verfahren zur Registerregelung in Rotationsdruckmaschinen

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Publication number Priority date Publication date Assignee Title
US3756725A (en) * 1970-10-12 1973-09-04 Harris Intertype Corp Measurement and control of ink density
US5724259A (en) * 1995-05-04 1998-03-03 Quad/Tech, Inc. System and method for monitoring color in a printing press
DE19638967C2 (de) * 1996-09-23 1998-12-17 Empa Messfeldgruppe und Verfahren zur Erfassung von optisch drucktechnischen Größen im Mehrfarben-Auflagendruck
US6874420B2 (en) 1999-10-22 2005-04-05 Cc1, Inc. System and method for register mark recognition
EP1262323B1 (fr) * 2001-05-29 2010-01-27 Web Printing Controls Co., Inc. Système pour surveiller et de controller dynamiquement une machine à imprimer des bandes
US6796240B2 (en) * 2001-06-04 2004-09-28 Quad/Tech, Inc. Printing press register control using colorpatch targets
US6975775B2 (en) * 2002-03-06 2005-12-13 Radiant Imaging, Inc. Stray light correction method for imaging light and color measurement system
FI115205B (fi) 2002-09-04 2005-03-31 Data Instmsto Oy Menetelmä ja laite painojäljen on-line valvomiseksi
US20040213436A1 (en) * 2003-04-25 2004-10-28 Quad/Tech, Inc. System and method for measuring color on a printing press
DE102004003612B4 (de) 2004-01-25 2015-01-08 grapho metronic Meß- und Regeltechnik GmbH Verfahren und Auswertung eines Bildes von einem vorbestimmten Ausschnitt eines Druckerzeugnisses
DE102004021597B4 (de) * 2004-05-03 2017-04-13 Heidelberger Druckmaschinen Ag Registermarke
DE102004044751A1 (de) * 2004-09-16 2006-04-20 Man Roland Druckmaschinen Ag Verfahren zur Regelung eines Farbwerks einer Druckmaschine sowie Farbwerk

Also Published As

Publication number Publication date
EP2727730A1 (fr) 2014-05-07
EP2070701B1 (fr) 2014-08-13
EP2070701A3 (fr) 2012-02-08
EP2070701A2 (fr) 2009-06-17
ES2513823T3 (es) 2014-10-27
DE102007059842A1 (de) 2009-06-25

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