EP1599341A2 - Method for the correction of variations in the amount of ink applied to the printed image occurring in the printing process - Google Patents

Method for the correction of variations in the amount of ink applied to the printed image occurring in the printing process

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Publication number
EP1599341A2
EP1599341A2 EP04702336A EP04702336A EP1599341A2 EP 1599341 A2 EP1599341 A2 EP 1599341A2 EP 04702336 A EP04702336 A EP 04702336A EP 04702336 A EP04702336 A EP 04702336A EP 1599341 A2 EP1599341 A2 EP 1599341A2
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EP
European Patent Office
Prior art keywords
printing
measured values
light
unit
printing process
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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
EP04702336A
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German (de)
French (fr)
Other versions
EP1599341B1 (en
Inventor
Martin Krümpelmann
Dietmar Pötter
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Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Publication of EP1599341A2 publication Critical patent/EP1599341A2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/45—Sensor for ink or dampening fluid thickness or density

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • a method is known from DE 101 45 927.
  • This application describes, inter alia, how to automatically adjust the positions of the rollers involved in the printing process after a job change.
  • a printing machine that allows the implementation of this method, since it has the features of the preamble of claim 4, shown in detail.
  • the present application is dispensed with the detailed description and graphic representation of said device or the said method. Therefore, the corresponding passages of DE 101 45 927 are to be used to understand the present application and are hereby incorporated into this application.
  • the application of the above-mentioned method shortens the set-up times considerably.
  • the rollers involved in the printing process are adjusted to one another in this way so that the printed images to be produced are well reproduced.
  • the contact pressure between the rollers involved in the printing process is kept as low as possible.
  • the object of the present invention is therefore to minimize these fluctuations.
  • target values in the sense of claims 1 and 4 can be determined here in any form described in DE 101 45 925. That is to say, they can once correspond to a "digital nominal shape" of the Print image are taken, which is stored in a storage unit.
  • nominal values in the sense of the present invention can also be determined by evaluating the characteristic curve of the intensity of the reflected light which results when the rolls participating in the printing process are evaluated in DE 101 45 925.
  • the nominal value in the context of the present application is a light intensity value which is recorded by the camera at a specific location of the characteristic curve of the light intensity
  • the light intensity values which make up the printed image or subregions thereof can be stored and subsequently output from the memory unit during printing as a setpoint within the meaning of the present application during printing operation and used for regulatory purposes.
  • a target value of the light intensity may also be a light intensity value that is at a certain point of the Characteristic course of the light intensity - possibly during the printing operation - over and over again recorded.
  • the position of the pressure rollers can be controlled preferably only before the onset of the regulation according to the invention as a function of the printing speed.
  • This control may be based on empirical values which are stored, for example, in the form of a calibration table in which a position value is assigned to a speed value.
  • the assignment of positions to print speeds can also be done with the aid of appropriately adapted algorithms or functions. Also on this subject, the objective description provides an example.
  • Advantageous methods in which at least one sensor records the intensity of light which has undergone an interaction with the printed material are also methods in which the transmission of light through printing material is measured.
  • the intensity of the light incident on the printing material should be known, so that the absorption of the printed image results from the difference between incident and transmitted light. Therefore, the use of a light source, which is the incident light provides. This irradiation can take place under standard conditions. These can be ensured for example by a shielded against light box, which protects the substrate at the place of measurement and the light source and the sensor from ambient light.
  • the intensity of light is recorded which has undergone an interaction with the printed fabric. It is irrelevant whether this interaction in a transmission or absorption, a reflection, refraction or other interaction between light and printed image.
  • Fig. 1 An illustration of the term "effective radius"
  • Fig. 2 An example of a function by which a roll position is controlled depending on the printing speed.
  • Fig. 1 shows the example of a printing unit with the plate roller K, the position of the plate cylinder K during the printing process.
  • the plate cylinder K and other flexible materials involved in the printing process such as the rubber coating, not shown, which may also be present in some flexographic printing presses on the platen roller, and the printing material also not shown are exposed to strong forces in the printing process.
  • the plate 12 is squeezed along the pressure line D between impression cylinder 11 and plate roller K.
  • a similar process takes place at the printing line 13 between the cliché roller K and the ink roller F.
  • the effective radius R eff which denotes the distance between the outer circumference of the plate and the rotation axis M immediately before the pressure line D is reached again, decreases.
  • this effective radius R eff is critical to the quality of the printing process.
  • the machine operator or the machine controller of a flexographic printing machine should make the cliché roller stronger against the platen roller 11.
  • Figure 2 shows a function which is based on the correction of the position of a roller x as a function of the speed v.
  • the function has a staircase-like shape, that is to say that an increase in the printing speed after certain speed intervals ⁇ v results in addition processes by ⁇ x.
  • this usually means that the cliché roll is moved further toward the impression cylinder as the speed increases.
  • a further provision of the anilox roller to the plate cylinder should be necessary.
  • the devices and methods shown can be used particularly advantageously in flexographic and gravure printing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color, Gradation (AREA)
  • Electronic Switches (AREA)

Abstract

A process for adjusting the print image of a rotating machine equipped with transfer rollers and actuators assigned to them includes changing the position of the rollers. During the printing operation, at least one camera records the intensity of light reflected from the printed material. The camera also feeds the recorded measured values to a control and regulation unit that compares the recorded measured values with set values, and generates corrective signals for the actuator of at least one part of the rollers involved in the printing process. Based on the corrective signals, the actuator of the relative position of the roller assigned to it is actuated until the measured values once again lie within a tolerance range.

Description

Verfahren zur Korrektur von im Druckprozess auftretenden Schwankungen der auf das Druckbild übertragenen Farbmenge Method for correcting variations in the amount of ink transferred to the printed image during the printing process
Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Anspruchs 1. Ein solches Verfahren ist aus der DE 101 45 927 bekannt. In dieser Anmeldung wird unter anderem beschrieben, wie man nach einem Auftragswechsel die Positionen der am Druckprozess beteiligten Walzen automatisch einstellt. Des weiteren ist eine Druckmaschine, die die Durchführung dieses Verfahrens erlaubt, da sie über die Merkmale des Oberbegriffs des Anspruchs 4 verfügt, ausführlich dargestellt. In der vorliegenden Anmeldung wird auf die eingehende Beschreibung und graphische Darstellung der genannten Vorrichtung beziehungsweise des genannten Verfahrens verzichtet. Daher sind die dementsprechenden Passagen der DE 101 45 927 zum Verständnis der vorliegenden Anmeldung heranzuziehen und werden hiermit in diese Anmeldung aufgenommen. Die Anwendung des oben angesprochenen Verfahrens verkürzt die Rüstzeiten erheblich. Darüber hinaus werden auf diese Weise die am Druckprozess beteiligten Walzen so aufeinander eingestellt, dass die herzustellenden Druckbilder gut reproduziert werden. Hierbei wird der Anpressdruck zwischen den am Druckprozess beteiligten Walzen auf möglichst niedrigem Niveau gehalten.The invention relates to a method according to the preamble of claim 1. Such a method is known from DE 101 45 927. This application describes, inter alia, how to automatically adjust the positions of the rollers involved in the printing process after a job change. Furthermore, a printing machine that allows the implementation of this method, since it has the features of the preamble of claim 4, shown in detail. In the present application is dispensed with the detailed description and graphic representation of said device or the said method. Therefore, the corresponding passages of DE 101 45 927 are to be used to understand the present application and are hereby incorporated into this application. The application of the above-mentioned method shortens the set-up times considerably. In addition, the rollers involved in the printing process are adjusted to one another in this way so that the printed images to be produced are well reproduced. Here, the contact pressure between the rollers involved in the printing process is kept as low as possible.
Überraschenderweise kommt es jedoch bei hohen Druckgeschwindigkeiten zu Schwankungen in der Farbintensität des übertragenen Druckbildes, die auf Schwankungen der beim Druckprozess übertragenen Farbmenge zurückzuführen sind. In der Re,gel nimmt die Farbintensität ab. Die Gründe für diesen überraschenden Effekt liegen nach Meinung der Anmelderin in Schwankungen des effektiven Radius der am Druckprozess beteiligten Walzen und im Trennverhalten der Druckfarben. Der erstere Effekt wird in der gegenständlichen Beschreibung näher dargelegt.Surprisingly, however, at high printing speeds, there are fluctuations in the color intensity of the transferred print image, which are due to fluctuations in the amount of ink transferred during the printing process. In the red, the color intensity decreases. The reasons for According to the applicant, this surprising effect is due to fluctuations in the effective radius of the rolls involved in the printing process and in the separation behavior of the printing inks. The former effect is explained in more detail in the subject description.
Die Aufgabe der vorliegenden Erfindung ist es daher, diese Schwankungen zu minimieren.The object of the present invention is therefore to minimize these fluctuations.
Erfindungsgemäß wird diese Aufgabe durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.According to the invention, this object is solved by the features of the characterizing part of claim 1.
Wichtig für das Verständnis des Umfanges der vorliegenden Erfindung ist, dass die „Sollwerte" im Sinne der Ansprüche 1 und 4 hierbei in jeder in der DE 101 45 925 beschriebenen Form ermittelt werden können. Das heißt, sie können einmal einer „digitalen Sollform" des Druckbildes entnommen werden, welche in einer Speichereinheit abgelegt ist.It is important for the understanding of the scope of the present invention that the "target values" in the sense of claims 1 and 4 can be determined here in any form described in DE 101 45 925. That is to say, they can once correspond to a "digital nominal shape" of the Print image are taken, which is stored in a storage unit.
„Sollwerte" im Sinne der vorliegenden Erfindung können aber auch ermittelt werden, indem der charakteristische Verlauf der Intensität des reflektierten Lichts, welcher sich beim Anstellen der am Druckprozess beteiligen Walzen ergibt, ausgewertet wird. Auch dieser charakteristische Verlauf und seine Auswertung zur Einstellung der Walzenpositionen ist in der DE 101 45 925 beschrieben. Der Sollwert im Sinne der vorliegenden Anmeldung ist in diesem Zusammenhang ein Lichtintensitätswert, der von der Kamera an einer bestimmten Stelle des charakteristischen Verlaufs der Lichtintensität aufgezeichnet wird. Dieser in der Regel beim Andruckvorgang gewonnene Lichtintensitätswert - beziehungsweise die Anzahl der Lichtintensitätswerte, aus denen sich das Druckbild oder Teilbereiche desselben zusammensetzen - kann gespeichert werden. Er kann anschließend während des Druckvorgangs als Sollwert im Sinne der vorliegenden Anmeldung während des Druckbetriebes aus der Speichereinheit ausgegeben und zu Regelungszwecken verwendet werden. Ein Sollwert der Lichtintensität kann jedoch auch ein Lichtintensitätswert sein, der an einer bestimmten Stelle des charakteristischen Verlaufs der Lichtintensität - ggf. während des Druckbetriebes - immer wieder von neuem aufgezeichnet wird.However, "nominal values" in the sense of the present invention can also be determined by evaluating the characteristic curve of the intensity of the reflected light which results when the rolls participating in the printing process are evaluated in DE 101 45 925. In this context, the nominal value in the context of the present application is a light intensity value which is recorded by the camera at a specific location of the characteristic curve of the light intensity The light intensity values which make up the printed image or subregions thereof can be stored and subsequently output from the memory unit during printing as a setpoint within the meaning of the present application during printing operation and used for regulatory purposes. However, a target value of the light intensity may also be a light intensity value that is at a certain point of the Characteristic course of the light intensity - possibly during the printing operation - over and over again recorded.
Die Formulierung „zumindest ein, Sensor - beispielsweise eine Kamera - welcher die Intensität des von dem bedruckten Stoff reflektierten Lichts aufzeichnet", welche sich bereits im kennzeichnenden Teil des Anspruchs 1 befindet, umschließt ausdrücklich alle zur Aufzeichnung von Lichtintensität geeigneten Sensoren. Die meisten dieser Sensoren arbeiten nach dem Stand der Technik aufgrund des Photoeffektes, wobei als optisch aktive Materialien in neuerer Zeit bevorzugt Halbleiter zum Einsatz kommen. Halbleiter sind auch Bestandteil elektronischer Kameras. Hierbei gehören CCD-Kameras (CCD = Charge Coupled Device) zu den bevorzugt benutzten Sensorsystemen.The phrase "at least one, sensor - for example a camera - which records the intensity of the light reflected from the printed matter" already in the characterizing part of claim 1 expressly encloses all sensors suitable for recording light intensity Most of these sensors According to the state of the art, they operate on the basis of the photoelectric effect, with semiconductors being used as optically active materials in recent times Semiconductors are also part of electronic cameras, CCD cameras (CCD = Charge Coupled Device) being among the sensor systems which are preferably used.
Es ist besonders vorteilhaft, wenn eine Steuerung der Walzenposition zusätzlich zu der erfindungsgemäßen Regelung vorgenommen wird. Hierzu kann die Position der Druckwalzen vorzugsweise vor Einsetzen der erfindungsgemäßen Regelung lediglich als Funktion der Druckgeschwindigkeit gesteuert werden. Dieser Steuerung können empirische Werte zugrunde liegen, die beispielsweise in Form einer Kalibriertabelle, in der einem Geschwindigkeitswert ein Positionswert zugeordnet ist, abgelegt werden. Natürlich kann die Zuordnung von Positionen zu Druckgeschwindigkeiten auch mit Hilfe entsprechend angepasster Algorithmen oder Funktionen erfolgen. Auch zu diesem Themenbereich liefert die gegenständliche Beschreibung ein Beispiel.It is particularly advantageous if a control of the roller position is made in addition to the regulation according to the invention. For this purpose, the position of the pressure rollers can be controlled preferably only before the onset of the regulation according to the invention as a function of the printing speed. This control may be based on empirical values which are stored, for example, in the form of a calibration table in which a position value is assigned to a speed value. Of course, the assignment of positions to print speeds can also be done with the aid of appropriately adapted algorithms or functions. Also on this subject, the objective description provides an example.
Vorteilhafte Verfahren bei denen zumindest ein Sensor die Intensität von Licht aufzeichnet, welches eine Wechselwirkung mit dem bedruckten Stoff erfahren hat, sind auch Verfahren, bei denen die Transmission von Licht durch Bedruckstoff gemessen wird. Zu diesem Zweck sollte die Intensität des auf den Bedruckstoff einfallenden Lichts bekannt sein, so dass sich die Absorption des Druckbildes aus der Differenz zwischen einfallenden und transmitiertem Licht ergibt. Vorteilhaft ist daher die Verwendung einer Lichtquelle, welche das einfallende Licht zur Verfügung stellt. Diese Bestrahlung kann unter Normbedingungen stattfinden. Diese können beispielsweise durch einen gegen Licht abgeschirmten Kasten, welcher den Bedruckstoff am Ort der Messung sowie die Lichtquelle und den Sensor vor Umgebungslicht schützt gewährleistet werden.Advantageous methods in which at least one sensor records the intensity of light which has undergone an interaction with the printed material are also methods in which the transmission of light through printing material is measured. For this purpose, the intensity of the light incident on the printing material should be known, so that the absorption of the printed image results from the difference between incident and transmitted light. Therefore, the use of a light source, which is the incident light provides. This irradiation can take place under standard conditions. These can be ensured for example by a shielded against light box, which protects the substrate at the place of measurement and the light source and the sensor from ambient light.
Auch bei diesen Ausführungsbeispielen der Erfindung wird die Intensität von Licht aufgezeichnet, welches eine Wechselwirkung mit dem bedruckten Stoff erfahren hat. Hierbei ist es unerheblich ob diese Wechselwirkung in einer Transmission beziehungsweise Absorption, einer Reflexion, Brechung oder einem sonstigen Wechselwirkungsvorgang zwischen Licht und Druckbild besteht.Also in these embodiments of the invention, the intensity of light is recorded which has undergone an interaction with the printed fabric. It is irrelevant whether this interaction in a transmission or absorption, a reflection, refraction or other interaction between light and printed image.
Weitere Ausführungsbeispiele der Erfindung gehen aus der gegenständlichen Beschreibung und den Ansprüchen hervor. Die einzelnen Figuren zeigen:Further embodiments of the invention will become apparent from the description and the claims. The individual figures show:
Fig. 1 Eine Veranschaulichung des Begriffs „effektiver Radius" Fig. 2 Ein Beispiel für eine Funktion, aufgrund der eine Walzenposition in Abhängigkeit von der Druckgeschwindigkeit gesteuert wird.Fig. 1 An illustration of the term "effective radius" Fig. 2 An example of a function by which a roll position is controlled depending on the printing speed.
Fig. 1 zeigt am Beispiel eines Druckwerkes mit der Klischeewalze K die Lage des Klischeezylinders K während des Druckprozesses. Der Klischeezylinder K und andere flexible am Druckprozess beteiligte Materialien wie der nicht dargestellte Gummibelag, der auch bei einigen Flexodruckmaschinen an der Gegendruckwalze vorhanden sein kann, und der ebenfalls nicht dargestellte Bedruckstoff sind im Druckprozess starken Kräften ausgesetzt. So wird das Klischee 12 entlang der Drucklinie D zwischen Gegendruckzylinder 11 und Klischeewalze K eingequetscht. Ein ähnlicher Vorgang findet an der Drucklinie 13 zwischen Klischeewalze K und Farbwalze F statt. Bei einer schnellen Rotation der Walze K um ihre Drehachse M kann es dazu kommen, dass die Deformation v. a. des Klischees an den vorgenannten Drucklinien K und 13 nicht mehr durch die Rückstellkräfte des verquetschten Materials 11 , 12, K wettgemacht wird, bevor das verquetschte Material erneut die Drucklinie D erreicht. Daher sinkt in diesem Fall der effektive Radius Reff der den Abstand zwischen dem Außenumfang des Klischees und der Drehachse M unmittelbar vor dem erneuten Erreichen der Drucklinie D bezeichnet. Dieser effektive Radius Reff ist jedoch entscheidend für die Güte des Druckprozesses. In dem oben beschriebenen Fall des Schrumpfens des effektiven Radius lässt der physikalische Druck an der Drucklinie D nach und es kann zu einer Beeinträchtigung des Farbübertrags auf den Bedruckstoff kommen. In diesem Fall sollte der Maschinenbediener oder die Maschinensteuerung einer Flexodruckmaschine die Klischeewalze stärker an die Gegendruckwalze 11 anstellen.Fig. 1 shows the example of a printing unit with the plate roller K, the position of the plate cylinder K during the printing process. The plate cylinder K and other flexible materials involved in the printing process such as the rubber coating, not shown, which may also be present in some flexographic printing presses on the platen roller, and the printing material also not shown are exposed to strong forces in the printing process. Thus, the plate 12 is squeezed along the pressure line D between impression cylinder 11 and plate roller K. A similar process takes place at the printing line 13 between the cliché roller K and the ink roller F. With a rapid rotation of the roller K about its axis of rotation M, it may happen that the deformation of the cliché ce above the aforementioned printing lines K and 13 is no longer compensated by the restoring forces of the squeezed material 11, 12, K, before the squeezed material again the pressure line D reached. Therefore, in this case, the effective radius R eff, which denotes the distance between the outer circumference of the plate and the rotation axis M immediately before the pressure line D is reached again, decreases. However, this effective radius R eff is critical to the quality of the printing process. In the case of the shrinkage of the effective radius described above, the physical pressure at the printing line D decreases and the transfer of ink to the printing material may be impaired. In this case, the machine operator or the machine controller of a flexographic printing machine should make the cliché roller stronger against the platen roller 11.
Angesichts der hohen Fliehkräfte kann es bei der Verwendung anderer Materialien jedoch auch zu einer Vergrößerung des effektiven Radius Reff kommen, die ein Ansteigen des physikalischen Drucks an der Drucklinie D nach sich zieht. In diesem Fall wird die Klischeewalze K etwas weiter von dem Gegendruckzylinder 11 abgefahren. Beide Vorgänge werden für die Zwecke dieser Anmeldung unter dem Fachterminus dynamische Beistellung zusammengefasst. Wie bereits erwähnt kann sich auch das Farbtrennverhalten als Funktion der Druckgeschwindigkeit ändern und auf diese Weise die Farbübertragung beeinflussen.However, in view of the high centrifugal forces, the use of other materials can also increase the effective radius R eff , which causes an increase in the physical pressure at the pressure line D. In this case, the plate roller K is moved a little further from the impression cylinder 11. Both procedures are summarized for the purposes of this application under the terminology dynamic provision. As already mentioned, the color separation behavior can also change as a function of the printing speed and in this way influence the color transfer.
Figur 2 zeigt eine Funktion, welche der Korrektur der Position eine Walze x in Abhängigkeit von der Geschwindigkeit v zugrunde liegt. Die Funktion hat eine treppenartige Gestalt, das heißt es kommt bei einer Erhöhung der Druckgeschwindigkeit nach gewissen Geschwindigkeitsintervallen Δv zu Beistellungsvorgängen um Δx. Bei einer Flexodruckmaschine heißt das in der Regel, dass die Klischeewalze bei einer Erhöhung der Geschwindigkeit weiter in Richtung auf den Gegendruckzylinder bewegt wird. Dann sollte in der Regel auch eine weitere Beistellung der Rasterwalze an den Klischeezylinder notwendig werden. Die gezeigten Vorrichtungen und Verfahren lassen sich im Flexo- und im Tiefdruck besonders vorteilhaft einsetzen.Figure 2 shows a function which is based on the correction of the position of a roller x as a function of the speed v. The function has a staircase-like shape, that is to say that an increase in the printing speed after certain speed intervals Δv results in addition processes by Δx. In a flexographic printing press, this usually means that the cliché roll is moved further toward the impression cylinder as the speed increases. Then usually a further provision of the anilox roller to the plate cylinder should be necessary. The devices and methods shown can be used particularly advantageously in flexographic and gravure printing.
Die gezeigte Möglichkeit der geschwindigkeitsabhängigen Steuerung der Walzenpositionen lässt sich mit dem erfindungsgemäßen Verfahren besonders vorteilhaft kombinieren, wenn zuerst geschwindigkeitsabhängig gesteuert und dann mit Hilfe der Auswertung des Druckbildes geregelt wird. Wie bereits erwähnt können auch andere Funktionen, Algorithmen oder Kalibriertabellen zur geschwindigkeitsabhängigen Steuerung herangezogen werden. Hierbei bieten sich auch lineare oder asymptotische Abhängigkeiten zwischen Druckgeschwindigkeit (v) und Walzenposition (x) an. The possibility shown of the speed-dependent control of the roller positions can be particularly with the inventive method Combine advantageous when first speed-dependent controlled and then regulated by means of the evaluation of the printed image. As already mentioned, other functions, algorithms or calibration tables can also be used for the speed-dependent control. Linear or asymptotic dependencies between print speed (v) and roller position (x) are also suitable.

Claims

Patentansprüche claims
1. Verfahren zur Einstellung des Druckbildes einer Rotationsdruckmaschine, welche über Farbubertragungswalzen (F,K) und diesen zugeordnete1. A method for adjusting the printed image of a rotary printing press, which on Farbubertragungswalzen (F, K) and associated therewith
Stellantriebe, mit welchen die Position der Walzen (F,K) veränderbar ist, verfügt und bei welchemActuators, with which the position of the rollers (F, K) is variable, has and in which
■ zumindest ein Sensor - beispielsweise eine Kamera - die Intensität von Licht aufzeichnet, welches eine Wechselwirkung mit dem bedruckten Stoff erfahren hat und ■ at least one sensor - for example a camera - records the intensity of light which has undergone an interaction with the printed material and
■ dass die aufgezeichneten Messwerte einer Steuer- und Regeleinheit zugeführt werden, ■ that the recorded measured values are fed to a control unit,
■ welche die aufgezeichneten Messwerte mit Sollwerten vergleicht und ■ which compares the recorded measured values with setpoints and
■ welche Stellsignale für den Stellantrieb zumindest eines Teils der am Druckprozess beteiligten Walzen erzeugt ■ which generates control signals for the actuator of at least part of the rollers involved in the printing process
■ aufgrund derer der Stellantrieb die Relativposition (x) der ihm zugeordneten Walze solange verändert, bis die Messwerte wieder innerhalb eines Toleranzbereichs liegen dadurch gekennzeichnet, dass On the basis of which the actuator changes the relative position (x) of the roller assigned to it until the measured values again lie within a tolerance range, characterized in that
■ zumindest ein Sensor während des Druckprozesses Messungen der Intensität von Lichts aufzeichnet, welches eine Wechselwirkung mit dem bedruckten Stoff erfahren hat, At least one sensor during the printing process records measurements of the intensity of light which interact with the has experienced printed fabric,
■ die Messwerte während des Druckbetriebs den in dem zumindest einen Farbwerk übertragenen Farben zugeordnet werden,The measured values during the printing operation are assigned to the colors transmitted in the at least one inking unit,
■ die Steuer- und Regeleinheit während des Druckbetriebs Stellsignale für den Stellantrieb zumindest eines Teils der am Druckprozess beteiligten Walzen (F,K) des jeweiligen Farbwerks erzeugt, ■ generating the control unit during the printing operation control signals for the actuating drive of at least part of the rolls involved in the printing process (F, K) of the respective inking unit,
■ so dass die im Druckprozess auftretenden Schwankungen der auf eine Flächeneinheit des Druckbildes übertragenen Farbmenge innerhalb eines Sollbereichs bleiben. ■ so that the fluctuations occurring in the printing process of the amount of ink transferred to a unit area of the printed image remain within a desired range.
2. Verfahren nach Anspruch 1 dadurch gekennzeichnet, dass die Steuer- und Regeleinheit bei Änderungen der Druckgeschwindigkeit (v) weitere Stellsignale erzeugt, aufgrund derer die Stellglieder die Walzenpositionen zunächst in Abhängigkeit von der Druckgeschwindigkeit (v) einstellen.2. The method according to claim 1, characterized in that the control unit generates changes in the printing speed (v) further control signals, due to which the actuators initially set the roller positions in dependence on the printing speed (v).
3. Verfahren nach Anspruch 2 dadurch gekennzeichnet, dass die Steuer- und Regeleiπheit bei Änderungen der Druckgeschwindigkeit (v) die weiteren Stellsignale aufgrund von Kalibriertabellen oder Algorithmen erzeugt, welche in einer Speichereinheit abgelegt sind.3. The method according to claim 2, characterized in that the control and Regeleiπheit with changes in the printing speed (v) generates the further control signals due to calibration tables or algorithms, which are stored in a memory unit.
4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der zumindest eine Sensor die Intensität von Licht aufzeichnet, welches zuvor durch den bedruckten Stoff gedrungen ist.4. The method according to any one of the preceding claims, characterized in that the at least one sensor records the intensity of light, which has previously penetrated through the printed fabric.
5. Verfahren nach Anspruch 4 dadurch gekennzeichnet, dass zumindest eine Lichtquelle auf der dem zumindest einen Sensor entgegengesetzten Seite des bedruckten Stoffes denselben mit Licht beaufschlagt.5. The method according to claim 4, characterized in that at least one light source on the at least one sensor opposite side of the printed fabric the same with light applied.
6. Rotationsdruckmaschine mit folgenden Merkmalen:6. Rotary printing machine with the following features:
Farbubertragungswalzen (F,K) und diesen zugeordnete Stellantriebe, wobei mit zumindest einem Stellantrieb die Relativposition (x) der ihm zugeordneten Walze aufgrund von Stellsignalen der Steuer- und Regeleinheit veränderbar ist, zumindest ein Sensor - beispielsweise eine Kamera - zur Aufzeichnung der Intensität von Licht, welches eine Wechselwirkung mit dem bedruckten Stoff erfahren hat, eine Steuer- und Regeleinheit, welche Mittel zum Vergleich der aufgezeichneten Messwerte mit Sollwerten besitzt und mit welcher Stellsignale für den Stellantrieb zumindest eines Teils der am Druckprozess beteiligten Walzen (F,K) generierbar sind, dadurch gekennzeichnet, dass die Steuer- und Regeleinheit mit einem Programm beaufschlagt ist, mit welchem die Messwerte während des Druckbetriebs den in dem zumindest einen Farbwerk übertragenen Farben zuzuordnen sind und dass mit der Steuer- und Regeleinheit während des Druckbetriebs Stellsignale für den Stellantrieb zumindest eines Teils der am Druckprozess beteiligten Walzen des jeweiligen Farbwerks generierbar sind.Color transfer rollers (F, K) and associated with these actuators, wherein with at least one actuator, the relative position (x) of its associated roller is variable due to control signals of the control unit, at least one sensor - for example, a camera - to record the intensity of light which has experienced an interaction with the printed material, a control and regulation unit which has means for comparing the recorded measured values with set values and with which actuating signals for the actuator of at least part of the rollers involved in the printing process (F, K) can be generated, characterized in that the control and regulating unit is acted upon by a program, with which the measured values are assigned during the printing operation to the colors transmitted in the at least one inking unit and that with the control and regulating unit during the printing operation actuating signals for the actuator of at least one part the one at the druc kprozess involved rollers of the respective inking unit can be generated.
7. Vorrichtung nach Anspruch 6 gekennzeichnet durch zumindest einen Sensor, mit welcher die Lichtintensität in unterschiedlichen Spektralbereichen messbar ist. 7. Apparatus according to claim 6 characterized by at least one sensor with which the light intensity in different spectral ranges is measurable.
EP04702336A 2003-01-24 2004-01-15 Method for the correction of variations in the amount of ink applied to the printed image occurring in the printing process Expired - Lifetime EP1599341B1 (en)

Applications Claiming Priority (3)

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DE10302747 2003-01-24
DE10302747A DE10302747A1 (en) 2003-01-24 2003-01-24 Method for correcting variations in the amount of ink transferred to the printed image during the printing process
PCT/EP2004/000416 WO2004065127A2 (en) 2003-01-24 2004-01-15 Method for the correction of variations in the amount of ink applied to the printed image occurring in the printing process

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EP (1) EP1599341B1 (en)
AT (1) ATE473864T1 (en)
DE (2) DE10302747A1 (en)
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US20060102038A1 (en) 2006-05-18
DE10302747A1 (en) 2004-08-12
WO2004065127A2 (en) 2004-08-05
IL169814A (en) 2008-08-07
WO2004065127A3 (en) 2004-11-04
ATE473864T1 (en) 2010-07-15
EP1599341B1 (en) 2010-07-14
ES2348297T3 (en) 2010-12-02
DE502004011392D1 (en) 2010-08-26
US7444935B2 (en) 2008-11-04

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