EP0763426A2 - 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
EP0763426A2
EP0763426A2 EP96114355A EP96114355A EP0763426A2 EP 0763426 A2 EP0763426 A2 EP 0763426A2 EP 96114355 A EP96114355 A EP 96114355A EP 96114355 A EP96114355 A EP 96114355A EP 0763426 A2 EP0763426 A2 EP 0763426A2
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EP
European Patent Office
Prior art keywords
der
werden
signals
printing
measuring locations
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.)
Granted
Application number
EP96114355A
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German (de)
English (en)
Other versions
EP0763426B1 (fr
EP0763426A3 (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
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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.
  • the aim of regulating the coloring is to influence the operations of a printing press in such a way that prints are produced which correspond to the wishes of the customers.
  • the color on the substrate is used to reproduce an image using the printing machine.
  • Important physical variables that allow a statement on the actual state of the coloring are the standard color values X, Y, Z of a colorimetric normal observer.
  • Spectral measuring devices are commonly used as sensing elements for standard color values, the mode of operation of which is described in more detail in the German standard DIN 5033.
  • the quality of the coloring can be improved if a large number of measuring locations on the printing material are selected which are representative of the coloring. In particular at high printing speeds, a large amount of information representing the printed image is obtained.
  • the amount of information that can be generated, the speed of forwarding and processing are limited by the technology of the sensing elements and the circuit arrangements connected to them. This is not the only reason why it is necessary to limit the number of measuring locations.
  • a method has already been described in WO 95/00336 A2 that enables the image signals to be used automatically to find suitable measuring locations.
  • 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 are determined in the printed image 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 measurement location does not take into account the characteristic dynamic controller properties of the printing press, such as. B. the controller characteristic or the frequency response of the control elements downstream of the controller or the dynamic behavior of the controller or the control elements in the event of faults. That is, a measuring location selected exclusively on the basis of the printed image does not necessarily have to be optimal for regulating a specific color or regulating the dampening solution.
  • DE 40 05 558 A1 describes a process for the process diagnosis of a rotary printing press, in which the cause for the exceeding of predetermined limit values is determined from the measured values for the remission from solid and grid fields and from the rates of change of the measured values.
  • the control is deactivated for certain diagnostic results.
  • the method can only be used when the pressure has reached a stable state.
  • the measuring locations are fixed and limited to a few solid and grid fields.
  • the machine diagnosis is based only on monitoring the remission of the solid and grid fields. The Monitoring of the regulation of all other physical quantities influencing the coloring is not provided here.
  • the characteristic dynamic controller properties of the printing press should be taken into account when searching for a measuring location.
  • the invention is intended to enable rapid regulation and improvement of the print quality.
  • the invention is based on the simulation of control processes during the start-up phase of the printing press. After all the essential control elements have been preset on the printing press and the first prints have been generated, the actual value signals for all physical variables to be controlled are determined by pixel-by-pixel, full-area scanning and stored in a control device. The sensing elements are matched to the respective physical size. The amounts and the direction of the defined control signals are already known and are also stored in the control device.
  • the actual value signals are determined again at at least one subsequent pressure at the same measuring locations.
  • the measuring locations are determined which reacted most sensitively to the defined control signals.
  • the coordinates of these measuring locations are stored in the control device. The actual value determination and the control of the physical quantities are only carried out at the selected measuring locations for the further prints.
  • the defined control signals can be generated by an operator and manually applied to the control signals.
  • the measured changes in coloration correspond to the changes that a viewer of the printed image would feel.
  • the regulation of the color at the automatically determined measuring locations can only be activated when the difference between the actual values and the predetermined target values exceeds a limit value which exceeds the recognizability threshold of color changes for the human eye.
  • each printing unit 1, 2, 3 of an offset sheet printing machine 4 there are adjusting elements 5, 6, 7 for different physical quantities which directly influence 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 connected to a control unit via lines 9, 10, 11 12 connected.
  • the control unit 12 is connected to a computing unit 13, which contains a storage unit 14 with a target image memory and an actual image memory.
  • the computing unit 13 is also connected to an image recording unit 15 and to a keyboard 16 and a screen 17.
  • the image recording unit 15 is arranged on the last printing unit 1 and detects the entire printed surface of the sheet 8.
  • a first sheet is printed with the offset sheet printing machine 4 which has already been preset.
  • the resulting printed image is captured over the entire area in a second step 21 by means of the image recording unit 15.
  • the signals representing the printed image are fed to the computing unit 13.
  • Target color values for a multiplicity of measuring locations are derived from these actual value signals and stored in a target image memory 14.
  • the measuring locations for obtaining the setpoint signals can be evenly distributed over the surface of the sheet 8 in a row and columnar grid.
  • a controlled variable counter is set to 1, so that all subsequent steps relate to a first physical quantity to be set.
  • the adjusting elements 5.1, 5.2, 5.3 for the dampening solution are adjusted by predetermined sizes.
  • the manipulated variables can be generated by the arithmetic unit 13 and fed to the actuating elements 5.1, 5.2, 5.3 via the machine control 12, or they can be entered manually, for which purpose an operator of the offset sheet-fed printing machine 4 makes corresponding entries into the arithmetic unit 13 via the keyboard 16.
  • the manipulated variables can be applied to all printing units 1 to 3 simultaneously or with a time interval.
  • the manipulated variables given to the control elements 5.1, 5.2, 5.3 cause a change in the coloring 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 5.1, 5.2, 5.3 for the first physical quantity to be set are set so far that the Procedure 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 ).
  • step 34 the color value acquisition using the image recording unit 15 only having to take place at the measuring locations determined in step 33.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
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
DE19533822A DE19533822A1 (de) 1995-09-13 1995-09-13 Verfahren zum Regeln der Farbgebung beim Drucken mit einer Druckmaschine
DE19533822 1995-09-13

Publications (3)

Publication Number Publication Date
EP0763426A2 true EP0763426A2 (fr) 1997-03-19
EP0763426A3 EP0763426A3 (fr) 1997-07-02
EP0763426B1 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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006006676A1 (de) * 2006-02-14 2007-08-23 Koenig & Bauer Aktiengesellschaft Bogenrotationsdruckmaschine
US7464645B2 (en) 2004-03-23 2008-12-16 Koenig & Bauer Aktiengesellschaft Printing machines having at least one machine element that can be adjusted by a setting element
EP1842673A3 (fr) * 2006-04-03 2011-10-12 manroland AG Contrôle de qualité intégré

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976556B1 (fr) * 1998-07-18 2002-05-02 MAN Roland Druckmaschinen AG Système d'entretien et diagnostic pour une machine d'impression
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
DE102007063853B3 (de) 2006-04-03 2023-12-28 manroland sheetfed GmbH Integrierte Qualitätsregelung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665496A (en) * 1983-11-04 1987-05-12 Gretag Aktiengesellschaft Process and apparatus for the evaluation of the printing quality of a printed product by 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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7464645B2 (en) 2004-03-23 2008-12-16 Koenig & Bauer Aktiengesellschaft Printing machines having at least one machine element that can be adjusted by a setting element
DE102006006676A1 (de) * 2006-02-14 2007-08-23 Koenig & Bauer Aktiengesellschaft Bogenrotationsdruckmaschine
EP1842673A3 (fr) * 2006-04-03 2011-10-12 manroland AG Contrôle de qualité intégré

Also Published As

Publication number Publication date
EP0763426B1 (fr) 2001-04-04
US5802978A (en) 1998-09-08
DE19533822A1 (de) 1997-03-20
EP0763426A3 (fr) 1997-07-02

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