EP0763426A2 - Method for controlling the inking in a printing machine - Google Patents

Method for controlling the inking in a printing machine 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
signals
printing
actual value
measuring locations
control
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EP96114355A
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German (de)
French (fr)
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EP0763426B1 (en
EP0763426A3 (en
Inventor
Wolfgang Geissler
Harald Bucher
Werner Dr. Huber
Bernd Kistler
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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    • 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)

Abstract

A method for controlling the colour rendering of printed material (8) produced by a sheet-fed offset printing machine (4) employs a scanning sensor (15) to register the actual colouration obtained. During the run-up phase the regulating mechanisms (5,6,7) for controlling the finished print quality e.g. wetting agent, sheet registration and ink delivery provide sensor signals for computer (13) storage (14) and a complete videoscan of the first printed sheets is also stored. The control settings (5,6,7) are then changed by a defined amount and further scans obtained for comparison to reveal the co-ordinates of all points on the sheets showing maximum response to change so that minimum stored data can control the print-run proper.

Description

Die Erfindung betrifft ein Verfahren zum Regeln der Farbgebung beim Drucken mit einer Druckmaschine. Ziel der Regelung der Farbgebung ist es, die Betriebsvorgänge einer Druckmaschine so zu beeinflussen, daß Drucke entstehen, die den Wünschen der Kunden entsprechen. Dazu ist es notwendig, mittels Abfühlelementen Istwert-Signale von physikalischen Größen abzuleiten, die die Farbgebung auf einem Bedruckstoff beschreiben. Durch die Farbgebung auf dem Bedruckstoff wird eine bildliche Vorlage mit Hilfe der Druckmaschine reproduziert. Wichtige physikalische Größen, die eine Aussage zum Istzustand der Farbgebung gestatten, sind die Normfarbwerte X, Y, Z eines farbmetrischen Normalbeobachters. Als Abfühlelemente für Normfarbwerte sind spektrale Meßgeräte gebräuchlich, deren Arbeitsweise in der deutschen Norm DIN 5033 näher beschrieben sind.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. For this purpose, it is necessary to derive actual value signals from physical quantities by means of sensing elements, which describe the coloring on a printing material. 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.

Die Qualität der Farbgebung kann verbessert werden, wenn eine hohe Anzahl von Meßorten auf den Bedruckstoff gewählt wird, die repräsentant für die Farbgebung sind. Insbesondere bei hoher Druckgeschwindigkeit fällt eine große Menge das Druckbild wiedergebende Informationen an. Die Menge erzeugbarer Informationen, die Geschwindigkeit der Weiterleitung und Verarbeitung sind durch die Technik der Abfühlelemente und der mit ihnen verbundenen Schaltungsanordnungen begrenzt. Nicht nur deshalb ist es notwendig, die Zahl der Meßorte einzuschränken.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.

In WO 95/00336 A2 ist bereits ein Verfahren beschrieben worden, daß es ermöglicht, aus den Bildsignalen selbsttätig geeignete Meßorte zu finden. Es sind sowohl Bildsignale verwendbar, die in der Druckvorstufe beim Generieren von Druckbildern gewonnen werden, als auch Bildsignale, die während des Druckens mittels einer in der Druckmaschine angeordneten Bildaufnahmeeinrichtung gewonnen werden. Die Bildsignale werden einem Computersystem zugeführt, das ein Programm beinhaltet, das die selbsttätige Auswahl der relevanten Meßorte vornimmt. Mit Hilfe des Programms wird ein Druckbild nach markanten Kenngrößen analysiert.
Beispielsweise werden Orte im Druckbild ermittelt, in denen Grautöne vorherrschen oder in denen Farben im wesentlichen solo stehen. Desweiteren werden geeignete Meßorte an Stellen im Druckbild gefunden, die scharfe Übergänge im Kontrast und in den Farbwerten aufweisen.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. With the help of the program, 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. In addition, suitable measuring locations are found at locations in the printed image which have sharp transitions in contrast and in the color values.

Diese Art der Meßortbestimmung berücksichtigt aber nicht die charakteristischen dynamischen Reglereigenschaften der Druckmaschine, wie z. B. die Reglerkennlinie oder den Frequenzgang der dem Regler nachgeordneten Stellelemente oder das dynamische Verhalten des Reglers oder der Stellelemente bei auftretenden Störungen. D. h., ein ausschließlich nach dem Druckbild ausgewählter Meßort muß nicht zwangsweise optimal zur Regelung einer bestimmten Farbe oder zur Regelung der Feuchtmittelgabe sein.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.

In DE 40 05 558 A1 ist ein Verfahren zur Prozeßdiagnose einer Rotationsdruckmaschine beschrieben, bei dem aus den Meßwerten für die Remission aus Vollton- und Rasterfeldern und aus den Änderungsgeschwindigkeiten der Meßwerte die Ursache für die überschreitung vorgegebener Grenzwerte bestimmt werden. Bei bestimmten Diagnoseergebnissen wird die Regelung außer Betrieb gesetzt. Das Verfahren ist nur anwendbar, wenn der Druck einen stabilen Zustand erreicht hat. Die Meßorte sind fest vorgegeben und auf wenige Vollton- und Rasterfelder beschränkt. Die Maschinendiagnose beruht lediglich auf der überwachung der Remission der Vollton- und Rasterfelder. Die Überwachung der Regelung aller weiteren die Farbgebung beeinflussenden physikalischen Größen ist hier nicht vorgesehen.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.

Es ist eine Aufgabe der Erfindung, selbsttätig die für eine Regelung der Farbgebung geeignetsten Meßorte zu finden. Bei der Meßortsuche sollen die charakteristischen dynamischen Reglereigenschaften der Druckmaschine berücksichtigt werden. Desweiteren soll die Erfindung eine schnelle Regelung und eine Verbesserung der Druckqualität ermöglichen.It is an object of the invention to automatically find the most suitable measuring locations for regulating the coloring. The characteristic dynamic controller properties of the printing press should be taken into account when searching for a measuring location. Furthermore, the invention is intended to enable rapid regulation and improvement of the print quality.

Die Aufgaben werden mit einem Verfahren nach den Merkmalen des Anspruchs 1 gelöst.The objects are achieved with a method according to the features of claim 1.

Die Erfindung beruht auf der Simulation von Regelvorgängen während der Anlaufphase der Druckmaschine. Nach dem alle wesentlichen Stellelemente an der Druckmaschine voreingestellt sind und die ersten Drucke erzeugt sind, werden durch eine pixelweise, vollflächige Abtastung die Istwert-Signale für alle zu regelnden physikalischen Größen ermittelt und in eine Steuereinrichtung abgespeichert. Die Abfühlelemente sind auf die jeweilige physikalische Größe abgestimmt. Die Beträge und die Richtung der definierten Stellsignale sind vorbekannt und sind ebenfalls inder Steuereinrichtung abgespeichert.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.

Um die Menge der in der Steuereinrichtung zu verarbeitenden Daten zu beschränken, ist es möglich, die Meßorte auf dem Druckerzeugnis von vornherein auszuschließen, die aus verfahrenstechnischen Gründen und aufgrund des Layouts nicht bedruckt werden sollen. Zum Beispiel können durch Bildverarbeitung Flächen mit unrelevanten Bildstellen auf dem Druckerzeugnis identifiziert werden, die bei der Weiterverarbeitung abgeschnitten werden oder die bei Bogendruckmaschinen den sogenannten Greiferrand bilden, an dem die Bogen mittels Greifern durch die Maschine gefördert werden.In order to limit the amount of data to be processed in the control device, it is possible to exclude from the outset the measuring locations on the printed product which, for procedural reasons and due to the layout, should not be printed. For example, image processing can be used to identify areas with irrelevant image points on the printed product which are cut off during further processing or which form the so-called gripper edge in sheet-fed printing machines which the sheets are conveyed through the machine by means of grippers.

Nachdem die Stellglieder für die physikalischen Größen mit den entsprechenden definierten Stellsignalen beaufschlagt wurden, werden an mindestens einem nachfolgenden Druck die Istwert-Signale an denselben Meßorten erneut bestimmt. Durch Vergleich der Istwert-Signale aus Drucken vor und nach der Beaufschlagung mit den definierten Stellsignalen werden die Meßorte ermittelt, die am empfindlichsten auf die definierten Stellsignale reagierten. Die Koordinaten dieser Meßorte werden in der Steuereinrichtung gespeichert. Die Istwert-Ermittlung und die Regelung der physikalischen Größen werden bei den weiteren Drucken nur noch an diesen selektierten Meßorten vorgenommen.After the actuators for the physical quantities have been subjected to the corresponding defined actuating signals, the actual value signals are determined again at at least one subsequent pressure at the same measuring locations. By comparing the actual value signals from prints before and after exposure to the defined control signals, 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.

In einer Variante der Erfindung können die definierten Stellsignale von einer Bedienperson generiert und von Hand auf die Stellsignale aufgegeben werden.In a variant of the invention, the defined control signals can be generated by an operator and manually applied to the control signals.

Wenn die Istwerte als farbmetrische Istwerte erzeugt werden, dann entsprechen die gemessenen Färbungsänderungen den Änderungen, die ein Betrachter des Druckbildes empfinden würde. Die Regelung der Farbe an den selbsttätig ermittelten Meßorten kann erst dann in Funktion gesetzt sein, wenn die Differenz zwischen Istwerten und vorgegebenen Sollwerten einen Grenzwert überschreitet, der die Erkennbarkeitsschwelle von Färbungsänderungen für das menschliche Auge überschreitet.If the actual values are generated as colorimetric actual values, 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.

Die Erfindung soll nachstehend anhand eines Ausführungsbeispiels noch näher erläutert werden. Es zeigen:

Fig. 1
ein Schema einer Regelanordnung beim Drucken mit einer Offsetdruckmaschine und
Fig. 2
ein Flußschema für die Meßortfindung.
The invention will be explained in more detail below using an exemplary embodiment. Show it:
Fig. 1
a diagram of a control arrangement when printing with an offset printing press and
Fig. 2
a flow chart for the measurement location.

Wie in Figur 1 gezeigt, befinden sich in jedem Druckwerk 1, 2, 3 einer Offsetbogendruckmaschine 4, Stellelemente 5, 6, 7 für verschiedene physikalische Größen, welche die Farbgebung auf einem Bogen 8 direkt beeinflussen. Die in Zonen wirkenden Stellelemente 5.1, 5.2, 5.3 für die Schichtdicke der Druckfarbe, die Stellelemente 6.1, 6.2, 6.3 für die Menge des Feuchtmittels und die Stellelemente 7.1, 7.2, 7.3 für das Register sind über Leitungen 9, 10, 11 mit einer Steuereinheit 12 verbunden. Die Steuereinheit 12 steht mit einer Recheneinheit 13 in Verbindung, die eine Speichereinheit 14 mit einem Sollbildspeicher und einem Istbildspeicher enthält. Die Recheneinheit 13 ist weiterhin mit einer Bildaufnahmeeinheit 15 und mit einer Tastatur 16 und einem Bildschirm 17 verbunden. Die Bildaufnahmeeinheit 15 ist am letzten Druckwerk 1 angeordnet und erfaßt die gesamte bedruckte Oberfläche des Bogens 8.As shown in FIG. 1, in 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.

Wie das Verfahren mit der zu Figur 1 beschriebenen Anordnung durchgeführt werden kann, soll nachstehend anhand von Figur 2 erläutert werden:How the method can be carried out with the arrangement described for FIG. 1 will be explained below with reference to FIG. 2:

In einem ersten Schritt 20 wird mit der bereits voreingestellten Offsetbogendruckmaschine 4 ein erster Bogen bedruckt. Das sich ergebende Druckbild wird in einem zweiten Schritt 21 mittels der Bildaufnahmeeinheit 15 vollflächig erfaßt. Die das Druckbild wiedergebenden Signale werden der Recheneinheit 13 zugeführt. Aus diesen Istwert-Signalen werden Sollfarbwerte für eine Vielzahl von Meßorten abgeleitet und in einem Sollbildspeicher 14 abgelegt. Die Meßorte für die Gewinnung der sollwert-Signale können über die Oberfläche des Bogens 8 gleichmäßig in einem zeilen- und spaltenförmigen Raster verteilt liegen. In einem weiteren Schritt 23 wird ein Regelgrößenzähler auf 1 gesetzt, so daß sich alle nachfolgenden Schritte auf eine erste zu stellende physikalische Größe beziehen. In diesem Ausführungsbeispiel werden mit V = 1 die Stellelemente 5.1, 5.2, 5.3 für den Anteil des Feuchtmittels im Druckfarbe-/Feuchtmittelgemisch auf den Plattenzylinder eines jeden Druckwerks 1 bis 3 angesprochen.In a first step 20, 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. In a further step 23, a controlled variable counter is set to 1, so that all subsequent steps relate to a first physical quantity to be set. In this exemplary embodiment, the control elements 5.1, 5.2, 5.3 for the proportion of the dampening solution in the printing ink / dampening solution mixture on the plate cylinder of each printing unit 1 to 3 are addressed with V = 1.

In einem nächsten Schritt 24 werden die Stellelemente 5.1, 5.2, 5.3 für das Feuchtmittel um vorgegebene Größen verstellt. Die Stellgrößen können von der Recheneinheit 13 generiert werden und über die Maschinensteuerung 12 den Stellelementen 5.1, 5.2, 5.3 zugeführt werden, oder sie können von Hand eingegeben werden, wozu ein Bediener der Offsetbogendruckmaschine 4 entsprechende Eingaben über die Tastatur 16 in die Recheneinheit 13 vornimmt. Die Stellgrößen können an allen Druckwerken 1 bis 3 gleichzeitig oder mit einem zeitlichen Abstand aufgegeben werden. Die auf die Stellelemente 5.1, 5.2, 5.3 aufgegebenen Stellgrößen bewirken eine Veränderung der Farbgebung auf dem Bogen 8.In a next step 24, 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.

Die Veränderung der Farbgebung wird von der Bildaufnahmeeinheit 15 erfaßt. Aus den das Druckbild wiedergebenden Signalen werden in einem Schritt 25 Istfarbwerte abgeleitet und in einem Istbildspeicher abgelegt. Im nächstfolgenden Schritt 26 werden für jeden Meßort mit Hilfe der Recheneinheit 13 die Differenzen D zwischen Ist- und Soll-Farbwerten gebildet. Im folgenden Schritt 27 werden die Differenzen D ermittelt, die einen Grenzwert DGRENZ überschreiten, wobei im nächsten Schritt 28 die Ortskoordinaten der Meßorte festgehalten werden, bei denen eine Grenzwertüberschreitung vorliegt. In einem weiteren Schritt 29 wird durch den Bediener der Offsetbogendruckmaschine 4 geprüft, ob die Stellelemente 5.1, 5.2, 5.3 für die erste zu stellende physikalische Größe soweit eingestellt sind, daß das Verfahren fortgeführt werden kann. Der Bediener hat die Möglichkeit, die Stellelemente 5.1, 5.2, 5.3 von Hand erneut zu verstellen, bis die Einstellungen für die Fortführung des Verfahrens brauchbar sind. Danach wird in einem Schritt 30 ein mit diesen Einstellungen der Stellelemente 5.1, 5.2, 5.3 erzeugtes Druckbild als aktuelles Druckbild im Sollbildspeicher 14 abgelegt. In einem Schritt 31 wird der Regelgrößenzähler um 1 erhöht, so daß, wenn die Abfrage in einem Schritt 32 ergibt, daß noch nicht mit allen Stellgrößen simuliert wurde, das Verfahren ab Schritt 24 für die restlichen Stellelemente 6 und 7 wiederholt wird. Wenn die Simulation der Farbgebung mit allen Stellgrößen durchgeführt wurde, dann werden in einem Schritt 33 für alle im Schritt 28 festgehaltenen Meßorte, die Meßorte bestimmt, bei denen ein Gradient (grad) der Färbungsänderung einen vorgegebenen Grenzwert (gradGRENZ) überschreitet.The change in color is detected by the image recording unit 15. In a step 25, actual color values are derived from the signals representing the printed image and stored in an actual image memory. In the next step 26, the differences D between the actual and target color values are formed for each measuring location with the aid of the computing unit 13. In the following step 27, the differences D are determined which exceed a limit value D LIMIT , in the next step 28 the location coordinates of the measurement locations at which the limit value has been exceeded are recorded. In a further step 29, 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. The operator has the option of manually adjusting the control elements 5.1, 5.2, 5.3 again until the settings can be used to continue the process. Then, in a step 30, 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. In a step 31, 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 ).

Im Anschluß kann in einem Schritt 34 der Fortdruck erfolgen, wobei die Farbwertgewinnung mit Hilfe der Bildaufnahmeeinheit 15 nur noch an den im Schritt 33 bestimmten Meßorten zu erfolgen braucht.Subsequent printing can then take place in a 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.

BezugszeichenlisteReference list

1, 2, 31, 2, 3
DruckwerkPrinting unit
44th
OffsetbogendruckmaschineOffset sheet printing machine
5, 6, 75, 6, 7
StellelementeControl elements
5.1, 5.2, 5.35.1, 5.2, 5.3
Stellelemente für das FeuchtmittelControl elements for the dampening solution
6.1, 6.2, 6.36.1, 6.2, 6.3
Stellelemente für das RegisterControl elements for the register
7.1, 7.2, 7.37.1, 7.2, 7.3
Stellelemente für die DruckfarbeControl elements for the printing ink
88th
Bogenbow
9, 10, 119, 10, 11
Leitungencables
1212th
SteuereinheitControl unit
1313
RecheneinheitArithmetic unit
1414
SpeichereinheitStorage unit
1515
BildaufnahmeeinheitImage acquisition unit
1616
Tastaturkeyboard
1717th
Bildschirmscreen
20 bis 3420 to 34
VerfahrensschritteProcedural steps

Claims (1)

Verfahren zum Regeln der Farbgebung beim Drucken mit einer Druckmaschine, - bei dem mit mindestens einem Abfühlelement, das an einem bestimmten Meßort auf die Oberfläche eines Aufzeichnungsträgers gerichtet ist, Istwert-Signale von mindestens einer die Farbgebung repräsentierenden physikalischen Größe abgeleitet werden, - bei dem die Istwert-Signale mit Sollwert-Signalen für die physikalische Größe an denselben Meßorten verglichen werden, - bei dem nach einer vorgegebenen Gesetzmäßigkeit aus dem erhaltenen Vergleichswert-Signalen Stellsignale für Stellglieder für die physikalische Größe abgeleitet werden und einem Stellglied zugeführt werden, - und bei dem durch das Stellglied der Istwert in einem gewünschten Wertebereich gebracht wird und dort selbsttätig gehalten wird, dadurch gekennzeichnet, - daß während der Anlaufphase der Druckmaschine (4) die Stellglieder (5, 6, 7) mit definierten Stellsignalen beaufschlagt werden, - daß Istwert-Signale aus einer Vielzahl von Meßorten von der gesamten bedruckten Fläche des Aufzeichnungsträgers (8) gewonnen werden, - daß für jede zu stellende physikalische Größe und für jeden Meßort die Änderungen der Istwert-Signale in Bezug auf die definierten Stellsignale bestimmt werden, - daß Meßorte ausgewählt werden, bei denen die Änderungen am stärksten auftreten, - und daß in der Fortdruckphase der Druckmaschine (4) die physikalischen Größen ausschließlich an den ausgewählten Meßorten geregelt werden. Process for regulating the coloring when printing with a printing press, in which actual value signals are derived from at least one physical quantity representing the coloration with at least one sensing element, which is directed at the surface of a recording medium at a specific measuring location, in which the actual value signals are compared with setpoint signals for the physical quantity at the same measuring locations, control signals for actuators for the physical quantity are derived from the comparison value signals obtained and are fed to an actuator, and in which the actuator brings the actual value into a desired value range and automatically keeps it there, characterized by - that during the start-up phase of the printing press (4) the actuators (5, 6, 7) are acted upon by defined actuating signals, - Actual value signals are obtained from a multiplicity of measuring locations from the entire printed surface of the recording medium (8), that the changes in the actual value signals in relation to the defined control signals are determined for each physical quantity to be set and for each measurement location, - that measuring locations are selected where the changes occur most strongly, - And that in the production phase of the printing press (4), the physical quantities are regulated only at the selected measuring locations.
EP96114355A 1995-09-13 1996-09-07 Method for controlling the inking in a printing machine Expired - Lifetime EP0763426B1 (en)

Applications Claiming Priority (2)

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DE19533822A DE19533822A1 (en) 1995-09-13 1995-09-13 Process for regulating the coloring when printing with a printing press
DE19533822 1995-09-13

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EP0763426A2 true EP0763426A2 (en) 1997-03-19
EP0763426A3 EP0763426A3 (en) 1997-07-02
EP0763426B1 EP0763426B1 (en) 2001-04-04

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EP (1) EP0763426B1 (en)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006006676A1 (en) * 2006-02-14 2007-08-23 Koenig & Bauer Aktiengesellschaft Sheet-
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 (en) * 2006-04-03 2011-10-12 manroland AG Integrated quality regulation

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE216953T1 (en) * 1998-07-18 2002-05-15 Roland Man Druckmasch MAINTENANCE AND INSPECTION SYSTEM FOR A PRINTING MACHINE
DE10105990A1 (en) * 2000-03-03 2001-09-06 Heidelberger Druckmasch Ag Method for controlling ink layer parameters for selected print zones in printer output to ensure there is a more homogenous ink distribution with sharper definition between print zones
DE10312998B4 (en) * 2002-04-03 2015-07-09 Heidelberger Druckmaschinen Ag Learner color guide
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 (en) * 2003-05-15 2011-03-09 大日本スクリーン製造株式会社 Control method of supply amount of dampening water in offset printing press
US20070089624A1 (en) * 2005-03-30 2007-04-26 Quark, Inc. Systems and methods for integrated extended process media productions
DE102007063851B3 (en) 2006-04-03 2024-02-22 manroland sheetfed GmbH Integrated quality control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142470B1 (en) * 1983-11-04 1988-01-07 GRETAG Aktiengesellschaft Method and device for judging the printing quality of a printed object, preferably printed by an offset printing machine, and offset printing machine provided with such a device
DE3708652A1 (en) * 1987-03-17 1988-09-29 Grapho Metronic Gmbh & Co Device for achieving a given ink density when printing with an offset printing machine
WO1995000336A2 (en) * 1993-06-25 1995-01-05 Heidelberger Druckmaschinen Ag Process and arrangement for controlling or regulating operations carried out by a printing machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005558A1 (en) * 1990-02-22 1991-09-19 Roland Man Druckmasch METHOD FOR PROCESS DIAGNOSIS OF A ROTATION PRINTING MACHINE USING REMISSIONS FROM FULL TONE AND GRID TONE FIELDS
DE4104537C2 (en) * 1991-02-14 1999-05-12 Roland Man Druckmasch Method for controlling a color guide of an offset printing machine
DE4335229C2 (en) * 1993-10-15 1998-07-16 Heidelberger Druckmasch Ag Method for producing color samples produced on an offset printing press

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142470B1 (en) * 1983-11-04 1988-01-07 GRETAG Aktiengesellschaft Method and device for judging the printing quality of a printed object, preferably printed by an offset printing machine, and offset printing machine provided with such a device
DE3708652A1 (en) * 1987-03-17 1988-09-29 Grapho Metronic Gmbh & Co Device for achieving a given ink density when printing with an offset printing machine
WO1995000336A2 (en) * 1993-06-25 1995-01-05 Heidelberger Druckmaschinen Ag Process and arrangement for controlling or regulating operations carried out by a printing machine

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 (en) * 2006-02-14 2007-08-23 Koenig & Bauer Aktiengesellschaft Sheet-
EP1842673A3 (en) * 2006-04-03 2011-10-12 manroland AG Integrated quality regulation

Also Published As

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DE19533822A1 (en) 1997-03-20
EP0763426B1 (en) 2001-04-04
US5802978A (en) 1998-09-08
EP0763426A3 (en) 1997-07-02

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