EP0763426B1 - Procédé pour contrôler l'encrage dans une machine d'impression - Google Patents

Procédé pour contrôler l'encrage dans une machine d'impression Download PDF

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Publication number
EP0763426B1
EP0763426B1 EP96114355A EP96114355A EP0763426B1 EP 0763426 B1 EP0763426 B1 EP 0763426B1 EP 96114355 A EP96114355 A EP 96114355A EP 96114355 A EP96114355 A EP 96114355A EP 0763426 B1 EP0763426 B1 EP 0763426B1
Authority
EP
European Patent Office
Prior art keywords
signals
print
printing
image
inking
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
EP96114355A
Other languages
German (de)
English (en)
Other versions
EP0763426A3 (fr
EP0763426A2 (fr
Inventor
Wolfgang Geissler
Harald Bucher
Werner Dr. Huber
Bernd Kistler
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0763426A2 publication Critical patent/EP0763426A2/fr
Publication of EP0763426A3 publication Critical patent/EP0763426A3/fr
Application granted granted Critical
Publication of EP0763426B1 publication Critical patent/EP0763426B1/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
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control

Definitions

  • the invention relates to a method for regulating the Coloring when printing with a printing press.
  • goal of Color scheme is to control the operations of one To influence the printing press so that prints are produced that meet the needs of customers. For this it is necessary by means of sensing elements actual value signals from physical Derive sizes that determine the coloring on a substrate describe.
  • the color on the substrate a pictorial template with the help of the printing press reproduced.
  • Important physical quantities that make a statement allow to the actual state of the coloring are Standard color values X, Y, Z of a colorimetric normal observer.
  • Spectral measuring devices are used as sensing elements for standard color values in use, the way they work in the German standard DIN 5033 are described in more detail.
  • the quality of the coloring can be improved if one high number of measuring locations on the substrate is selected, which are representative of the coloring. Especially at high printing speed drops a large amount of that Information reproducing the printed image.
  • the amount information that can be generated, the speed of Forwarding and processing are through the technology of Sensing elements and those associated with them Circuit arrangements limited. It's not just that necessary to limit the number of measuring locations.
  • a method has already been described in WO 95/00336 A2 that makes it possible to automatically find suitable measuring locations from the image signals.
  • Both image signals which are obtained in the prepress stage when generating print images and image signals which are obtained during printing by means of an image recording device arranged in the printing press can be used.
  • the image signals are fed to a computer system which contains a program which automatically selects the relevant measuring locations.
  • a print image is analyzed for distinctive parameters. For example, locations in the printed image are determined in which shades of gray predominate or in which colors are essentially solo.
  • suitable measuring locations are found at locations in the printed image which have sharp transitions in contrast and in the color values.
  • this type of measuring location does not take into account the characteristic dynamic controller characteristics of the Printing machine, such as B. the controller characteristic or Frequency response of the control elements or the dynamic behavior of the controller or the control elements in the event of faults. That is, an exclusively after The measurement location selected in the printed image does not necessarily have to be ideal for regulating a certain color or regulating the dampening solution.
  • the tasks are performed using a procedure according to the characteristics of claim 1 solved.
  • the invention is based on the simulation of control processes during the start-up phase of the printing press. After all essential control elements on the printing press are preset and the first prints are generated, are the pixel by pixel, full-surface scanning Actual value signals for all physical variables to be controlled determined and stored in a control device.
  • the Sensing elements are based on the respective physical size Voted. The amounts and the direction of the defined Control signals are already known and are also in the Control device stored.
  • the corresponding defined control signals are applied have been printed on at least one subsequent print Actual value signals redetermined at the same measuring locations.
  • the Measuring locations determined which are most sensitive to the defined Control signals responded.
  • the coordinates of these measuring locations are stored in the control device. The Determining the actual value and regulating the physical quantities will only be added to the other prints selected measuring locations.
  • the defined Control signals can be generated by an operator and by hand to the control signals.
  • the measured changes in color correspond to Changes that a viewer of the printed image feels would.
  • the regulation of the color on the automatically determined Measuring locations can only be activated when the Difference between actual values and specified target values exceeds a threshold that exceeds the detectability threshold of color changes for the human eye exceeds.
  • Control elements 5, 6, 7 for different physical quantities, which directly affect the coloring on a sheet 8.
  • the control elements 5.1, 5.2, 5.3 acting in zones for the Layer thickness of the printing ink, the control elements 6.1, 6.2, 6.3 for the amount of dampening solution and the Control elements 7.1, 7.2, 7.3 for the register are over Lines 9, 10, 11 connected to a control unit 12.
  • the Control unit 12 stands with a computing unit 13 in Connection that a storage unit 14 with a Contains target image memory and an actual image memory.
  • the Computing unit 13 is also with a Image acquisition unit 15 and with a keyboard 16 and one Screen 17 connected.
  • the image recording unit 15 is on last printing unit 1 arranged and recorded the entire printed surface of the sheet 8.
  • a first step 20 with the preset offset sheet printing machine 4 a first sheet printed.
  • the resulting printed image is in a second Step 21 over the entire surface by means of the image recording unit 15 detected.
  • the signals representing the printed image become the Computing unit 13 supplied. From these actual value signals become target color values for a variety of measuring locations derived and stored in a target image memory 14.
  • the Measuring locations for obtaining the setpoint signals can be via the surface of the sheet 8 evenly in a line and columnar grid are distributed.
  • Step 23 sets a controlled variable counter to 1 so that all subsequent steps are based on a first one refer to physical quantity.
  • V 1, the control elements 6.1, 6.2, 6.3 for the Proportion of dampening solution in the ink / dampening solution mixture on the plate cylinder of each printing unit 1 to 3 addressed.
  • the manipulated variables can be from Computing unit 13 are generated and via the Machine control 12 the control elements 6.1, 6.2, 6.3 can be fed, or they can be entered manually, for which purpose an operator of the offset sheet printing machine 4 corresponding entries on the keyboard 16 in the Computing unit 13 performs.
  • the manipulated variables can be on all Printing units 1 to 3 simultaneously or with a temporal Distance to be given up.
  • the on the Control elements 6.1, 6.2, 6.3 cause the manipulated variables a change in color on the sheet 8.
  • the change in color is detected by the image recording unit 15.
  • actual color values are derived from the signals representing the printed image and stored in an actual image memory.
  • the differences D between the actual and target color values are formed for each measuring location with the aid of the computing unit 13.
  • the differences D are determined which exceed a limit value D LIMIT
  • the location coordinates of the measurement locations at which the limit value has been exceeded are recorded.
  • the operator of the offset sheet-fed printing machine 4 checks whether the adjusting elements 6.1, 6.2, 6.3 for the first physical quantity to be set are set to such an extent that the method can be continued.
  • a print image generated with these settings of the control elements 5.1, 5.2, 5.3 is stored as the current print image in the target image memory 14.
  • the controlled variable counter is increased by 1, so that if the query in a step 32 shows that all the manipulated variables have not yet been simulated, the process is repeated from step 24 for the remaining adjusting elements 6 and 7. If the simulation of the coloring has been carried out with all manipulated variables, then in a step 33 for all measuring locations recorded in step 28, the measuring locations are determined at which a gradient (degree) of the color change exceeds a predetermined limit value (degree LIMIT ).
  • the production can be carried out in a step 34.
  • the color value acquisition using the Image acquisition unit 15 only on the in step 33 certain measuring locations needs to take place.

Landscapes

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

Claims (1)

  1. Procédé pour le réglage de l'encrage dans l'impression exécutée avec une machine à imprimer (4),
    dans lequel, d'une première impression faite sur un support d'enregistrement (8), sont tirés, au moyen d'une unité de prise de vues (15), en une pluralité de zones de mesure, des signaux qui reproduisent la surface de l'impression, et ces signaux sont mémorisés,
    dans lequel des signaux de réglage définis sont appliqués à des actionneurs (5-7) prévus pour au moins une grandeur physique représentant l'encrage et de nouvelles impressions sont produites,
    dans lequel, d'une des nouvelles impressions, sont tirés, au moyen de l'unité de prise de vues (15), en la pluralité de zones de mesure, des signaux qui reproduisent la surface de l'impression, et ces signaux sont mémorisés,
    dans lequel les signaux mémorisés pour chaque zone de mesure de la première impression et de l'une des nouvelles impressions sont comparés,
    dans lequel, sur la base de la comparaison des signaux obtenus dans la pluralité de zones de mesure, des zones de mesure où les signaux ont été modifiés le plus fortement après l'application des signaux de réglage définis sont sélectionnés, et
    dans lequel, dans la phase de continuation de l'impression de la machine à imprimer (4), les grandeurs physiques représentant au moins un encrage sont réglées exclusivement au moyen des signaux obtenus dans les zones de mesure sélectionnées.
EP96114355A 1995-09-13 1996-09-07 Procédé pour contrôler l'encrage dans une machine d'impression Expired - Lifetime EP0763426B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19533822 1995-09-13
DE19533822A DE19533822A1 (de) 1995-09-13 1995-09-13 Verfahren zum Regeln der Farbgebung beim Drucken mit einer Druckmaschine

Publications (3)

Publication Number Publication Date
EP0763426A2 EP0763426A2 (fr) 1997-03-19
EP0763426A3 EP0763426A3 (fr) 1997-07-02
EP0763426B1 true EP0763426B1 (fr) 2001-04-04

Family

ID=7771989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96114355A Expired - Lifetime EP0763426B1 (fr) 1995-09-13 1996-09-07 Procédé pour contrôler l'encrage dans une machine d'impression

Country Status (3)

Country Link
US (1) US5802978A (fr)
EP (1) EP0763426B1 (fr)
DE (1) DE19533822A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005092613A2 (fr) 2004-03-23 2005-10-06 Koenig & Bauer Aktiengesellschaft Machines a imprimer comportant au moins un element ajustable a l'aide d'un element de reglage

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59901334D1 (de) * 1998-07-18 2002-06-06 Roland Man Druckmasch Wartungs- und Inspektionssystem für eine Druckmaschine
DE10105990A1 (de) * 2000-03-03 2001-09-06 Heidelberger Druckmasch Ag Verfahren zum Steuern einer Farbschicht auf der Druckform einer Druckmaschine
DE10312998B4 (de) * 2002-04-03 2015-07-09 Heidelberger Druckmaschinen Ag Lernende Farbführung
US7017492B2 (en) * 2003-03-10 2006-03-28 Quad/Tech, Inc. Coordinating the functioning of a color control system and a defect detection system for a printing press
JP4646541B2 (ja) * 2003-05-15 2011-03-09 大日本スクリーン製造株式会社 オフセット印刷機における湿し水の供給量制御方法
US20070089624A1 (en) * 2005-03-30 2007-04-26 Quark, Inc. Systems and methods for integrated extended process media productions
DE102006006676A1 (de) * 2006-02-14 2007-08-23 Koenig & Bauer Aktiengesellschaft Bogenrotationsdruckmaschine
DE102007063853B3 (de) 2006-04-03 2023-12-28 manroland sheetfed GmbH Integrierte Qualitätsregelung
DE102007008392B4 (de) * 2006-04-03 2014-07-17 manroland sheetfed GmbH Integrierte Qualitätsregelung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4660159A (en) * 1983-11-04 1987-04-21 Gretag Aktiengesellschaft Process and apparatus for the regulation of ink feed controls in an offset printing machine
DE3708652A1 (de) * 1987-03-17 1988-09-29 Grapho Metronic Gmbh & Co Verfahren zur erzielung einer vorgegebenen farbdichte beim drucken mit einer offset-druckmaschine
DE4005558A1 (de) * 1990-02-22 1991-09-19 Roland Man Druckmasch Verfahren zur prozessdiagnose einer rotationsdruckmaschine anhand von remissionen von vollton- und rastertonfeldern
DE4104537C2 (de) * 1991-02-14 1999-05-12 Roland Man Druckmasch Verfahren zur Steuerung einer Farbführung einer Offset-Druckmaschine
DE4321179A1 (de) * 1993-06-25 1995-01-05 Heidelberger Druckmasch Ag Verfahren und Einrichtung zur Steuerung oder Regelung von Betriebsvorgängen einer drucktechnischen Maschine
DE4335229C2 (de) * 1993-10-15 1998-07-16 Heidelberger Druckmasch Ag Verfahren zum Erzeugen von auf einer Offsetdruckmaschine hergestellten Farbmustern

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005092613A2 (fr) 2004-03-23 2005-10-06 Koenig & Bauer Aktiengesellschaft Machines a imprimer comportant au moins un element ajustable a l'aide d'un element de reglage

Also Published As

Publication number Publication date
DE19533822A1 (de) 1997-03-20
EP0763426A3 (fr) 1997-07-02
US5802978A (en) 1998-09-08
EP0763426A2 (fr) 1997-03-19

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