EP0673770A1 - Method and means for removing hickies from the printing plate in a printing machine - Google Patents

Method and means for removing hickies from the printing plate in a printing machine Download PDF

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Publication number
EP0673770A1
EP0673770A1 EP95103230A EP95103230A EP0673770A1 EP 0673770 A1 EP0673770 A1 EP 0673770A1 EP 95103230 A EP95103230 A EP 95103230A EP 95103230 A EP95103230 A EP 95103230A EP 0673770 A1 EP0673770 A1 EP 0673770A1
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EP
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Prior art keywords
dampening
roller
speed
peripheral speed
plate cylinder
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Granted
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EP95103230A
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German (de)
French (fr)
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EP0673770B1 (en
Inventor
Peter Hummel
Robert Ortner
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication of EP0673770A1 publication Critical patent/EP0673770A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/02—Cleaning arrangements or devices for forme cylinders

Definitions

  • the invention relates to a method and a device for removing slugs on the printing plate of a plate cylinder of a printing press, in which the peripheral speed of a dampening roller of a dampening unit, which normally corresponds to the peripheral speed of the printing plate, temporarily decreases and at the same time the rotating speed of a dampening agent supply roller, which is independently controllable for metering the fountain solution supply will be changed.
  • a so-called wiping or delta effect is achieved due to the lower peripheral speed of the dampening roller compared to the plate cylinder, through which slugs are removed from the printing plate.
  • the drive speed of the dampening roller of the dampening unit which is driven by an electric motor, is increased while the circumferential speed of the dampening roller is reduced, thereby offering more dampening solution.
  • the amount of dampening solution supplied to the printing plate is also to be reduced in delta operation, ie in the case of the peripheral speed of the plate cylinder
  • the peripheral speed of the dampening roller remains the same.
  • this known procedure has not proven suitable in practice. Rather, it was found that too much dampening solution is being fed to the printing plate, so that dampening solution reaches the inking unit via the plate cylinder and, if present, also via a bridge roller. As a result, the print result fades and ink in the inking unit emulsifies with dampening solution. The printing must then be stopped and the inking unit washed.
  • the invention has for its object to provide a method of the type mentioned that does not affect the printing process and enables a consistent printing result.
  • this object is achieved in that the speed of rotation of the dampening roller is simultaneously changed while reducing the peripheral speed of the dampening roller such that the dampening solution supply to the dampening roller is reduced and that when the peripheral speed of the dampening roller is adjusted to the peripheral speed of the printing plate, the rotational speed of the dampening solution feeding roller is reset to the previous value.
  • the method according to the invention is based on the surprising finding that, despite the reduction in the peripheral speed of the dampening application roller with constant metering of the dampening solution supply, the quantity of dampening solution supplied to the printing plate increases and the printing result thereby deteriorates.
  • By reducing the dampening solution supply to the dampening roller this increased dampening solution transfer is compensated for in delta operation and a change in the ink-moisture balance when switching to delta operation is avoided.
  • the method according to the invention thus enables contamination on the printing plate to be removed while maintaining a constant printing result.
  • the required degree of reduction of the dampening solution supply with a reduced peripheral speed of the dampening roller depends on the respective setting of the printing press and can be determined empirically in a simple manner. Once the suitable setting has been found, the switchover can take place automatically without manual intervention by the printer. A device suitable for this is specified in claim 3.
  • the dampening solution supply can be changed in different ways depending on the design of the dampening unit.
  • a method is advantageous in which the dampening solution supply is reduced by lowering the speed of the separately driven immersion roller of the dampening unit, for example a three-roller dampening unit.
  • the drawing shows the roller diagram of a dampening unit of a rotary offset printing machine.
  • the dampening system shown consists of a three-roller system which comprises a dampening roller 3, an immersion roller 4 and a metering roller 5.
  • the dampening roller 3 is in contact with a plate cylinder 7 to transfer to this dampening solution. It is driven together with the plate cylinder 7 by the drive of the printing press.
  • Under the The dampening roller 3 is the immersion roller 4, which takes the dampening solution from a dampening solution tank 9 and transfers it to the dampening roller 3.
  • the dosing roller 5 abutting the dipping roller 4 ensures, in a known manner, a uniform distribution of the dampening solution on the surface of the dipping roller 4 and determines the thickness of the dampening solution film.
  • Both rollers, the dipping roller 4 and the metering roller 5, are driven by a common separate drive, for example an electric motor, the drive speed of which can be regulated.
  • dampening roller 3 there is a driven bridge roller 2 which bears against the dampening roller 3 and an inking roller 1 of an inking unit 10 which is only partially shown.
  • a tandem roller 6 can be provided which interacts with the bridge roller 2 and the dampening roller 3. With 8 the blanket cylinder transmitting the printed image is designated.
  • the plate cylinder 7 and the dampening roller 3 are driven at the same peripheral speed, the plate cylinder 7 rotating at the machine speed.
  • the speed and thus the peripheral speed of the dipping roller 4 and the metering roller 5 depends on the required dosage of the dampening solution supply.
  • the peripheral speed of the dipping roller 4 can deviate from the peripheral speed of the dampening roller 3.
  • the drive speed of the dampening roller 3 is reduced by approximately 5 to 10%, for example with the aid of a gearbox, while the plate cylinder 7 continues to rotate at machine speed. Due to the reduced peripheral speed of the dampening roller 3 in this way arises on the pressure plate of the plate cylinder 7 a wiping effect, whereby slugs on the printing plate are removed. It has now been found that, contrary to all expectations, the supply of dampening solution on the printing plate does not increase when switching to operation with a wiping effect without changing the setting of the dampening unit, so that the printed image fades and there is a risk of dampening solution getting into the inking unit.
  • the drive speed of the dipping roller 4 and the metering roller 5 is reduced to the extent that the ink-moisture balance remains unchanged simultaneously with the switching of the drive of the dampening roller 3 to a lower speed.
  • the system is switched back to normal operation, ie the peripheral speed of the dampening roller 3 is adjusted again to the peripheral speed of the plate cylinder 7 and the drive speeds of the dipping roller 4 and the metering roller 5 are switched back to the previously set value.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The rotational speed of the driven dipping roller (4) supplying humidity is altered by reducing the peripheral speed of the humidity-applicator roller (3). This ensures that the supply of humidifier to the humidity applicator roller is reduced. When the peripheral speed of the humidity applicator roller is again matched with that of the printing plate (7), the rotational speed of the roller supplying the humidifier reverts to its previous amount. The supply of humidifier is reduced by reducing the rotational speed of the roller (4).

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Beseitigung von Butzen auf der Druckplatte eines Plattenzylinders einer Druckmaschine, bei dem die normalerweise der Umfangsgeschwindigkeit der Druckplatte entsprechende Umfangsgeschwindigkeit einer Feuchtauftragwalze eines Feuchtwerks vorübergehend verringert und gleichzeitig die zur Dosierung der Feuchtmittelzufuhr unabhängig regelbare Drehgeschwindigkeit einer Feuchtmittel zuführenden Walze geändert wird. Bei diesem Verfahren wird durch die gegenüber dem Plattenzylinder geringere Umfangsgeschwindigkeit der Feuchtauftragwalze ein sogenannter Wisch- oder Deltaeffekt erzielt, durch den Butzen von der Druckplatte entfernt werden.The invention relates to a method and a device for removing slugs on the printing plate of a plate cylinder of a printing press, in which the peripheral speed of a dampening roller of a dampening unit, which normally corresponds to the peripheral speed of the printing plate, temporarily decreases and at the same time the rotating speed of a dampening agent supply roller, which is independently controllable for metering the fountain solution supply will be changed. In this method, a so-called wiping or delta effect is achieved due to the lower peripheral speed of the dampening roller compared to the plate cylinder, through which slugs are removed from the printing plate.

Bei einem aus der DE 36 20 256 C2 bekannten Verfahren der angegebenen Art wird während der Verringerung der Umfangsgeschwindigkeit der Feuchtauftragwalze die Antriebsdrehzahl der mit Hilfe eines Elektromotors angetriebenen Tauchwalze des Feuchtwerks erhöht und dadurch mehr Feuchtmittel angeboten. Hierdurch soll die der Druckplatte zugeführte Feuchtmittelmenge auch bei Delta-Betrieb, d.h. bei zur Umfangsgeschwindigkeit des Plattenzylinders herabgesetzter Umfangsgeschwindigkeit der Feuchtauftragwalze gleich bleiben. Diese bekannte Verfahrensweise hat sich jedoch in der Praxis als nicht geeignet erwiesen. Es zeigte sich vielmehr, daß hierbei zuviel Feuchtmittel der Druckplatte zugeführt wird, so daß Feuchtmittel über den Plattenzylinder und, soweit vorhanden, auch über eine Brückenwalze ins Farbwerk gelangt. Dies hat zur Folge, daß das Druckergebnis verblaßt und Farbe im Farbwerk mit Feuchtmittel emulgiert. Der Druck muß dann abgebrochen und das Farbwerk gewaschen werden.In one of the methods known from DE 36 20 256 C2, the drive speed of the dampening roller of the dampening unit, which is driven by an electric motor, is increased while the circumferential speed of the dampening roller is reduced, thereby offering more dampening solution. As a result, the amount of dampening solution supplied to the printing plate is also to be reduced in delta operation, ie in the case of the peripheral speed of the plate cylinder The peripheral speed of the dampening roller remains the same. However, this known procedure has not proven suitable in practice. Rather, it was found that too much dampening solution is being fed to the printing plate, so that dampening solution reaches the inking unit via the plate cylinder and, if present, also via a bridge roller. As a result, the print result fades and ink in the inking unit emulsifies with dampening solution. The printing must then be stopped and the inking unit washed.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art anzugeben, das den Druckvorgang nicht beeinträchtigt und ein gleichbleibendes Druckergebnis ermöglicht.The invention has for its object to provide a method of the type mentioned that does not affect the printing process and enables a consistent printing result.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Drehgeschwindigkeit der Feuchtmittel zuführenden Walze bei Verringerung der Umfangsgeschwindigkeit der Feuchtauftragwalze gleichzeitig derart geändert wird, daß die Feuchtmittelzufuhr zur Feuchtauftragwalze reduziert wird und daß beim erneuten Angleichen der Umfangsgeschwindigkeit der Feuchtauftragwalze an die Umfangsgeschwindigkeit der Druckplatte die Drehgeschwindigkeit der Feuchtmittel zuführenden Walze auf den vorherigen Wert zurückgestellt wird.According to the invention this object is achieved in that the speed of rotation of the dampening roller is simultaneously changed while reducing the peripheral speed of the dampening roller such that the dampening solution supply to the dampening roller is reduced and that when the peripheral speed of the dampening roller is adjusted to the peripheral speed of the printing plate, the rotational speed of the dampening solution feeding roller is reset to the previous value.

Das erfindungsgemäße Verfahren beruht auf der überraschenden Erkenntnis, daß trotz der Herabsetzung der Umfangsgeschwindigkeit der Feuchtauftragwalze bei gleichbleibender Dosierung der Feuchtmittelzufuhr die der Druckplatte zugeführte Feuchtmittelmenge zunimmt und dadurch das Druckergebnis verschlechtert. Durch Verringerung der Feuchtmittelzufuhr zur Feuchtauftragwalze wird diese erhöhte Feuchtmittelübertragung im Delta-Betrieb ausgeglichen und eine Veränderung des Farb-Feuchtigkeitsgleichgewichts beim Umschalten auf Delta-Betrieb vermieden. Das erfindungsgemäße Verfahren ermöglicht somit eine Beseitigung von Verunreinigungen auf der Druckplatte unter Beibehaltung eines gleichbleibenden Druckergebnisses. Das erforderliche Maß der Reduzierung der Feuchtmittelzufuhr bei herabgesetzter Umfangsgeschwindigkeit der Feuchtauftragwalze richtet sich nach der jeweiligen Einstellung der Druckmaschine und kann auf einfache Weise empirisch ermittelt werden. Ist die geeignete Einstellung einmal gefunden, so kann im weiteren Betrieb die Umschaltung jeweils automatisch ohne manuelle Eingriffe des Druckers erfolgen. Eine hierzu geeignete Vorrichtung ist in Patentanspruch 3 angegeben.The method according to the invention is based on the surprising finding that, despite the reduction in the peripheral speed of the dampening application roller with constant metering of the dampening solution supply, the quantity of dampening solution supplied to the printing plate increases and the printing result thereby deteriorates. By reducing the dampening solution supply to the dampening roller, this increased dampening solution transfer is compensated for in delta operation and a change in the ink-moisture balance when switching to delta operation is avoided. The method according to the invention thus enables contamination on the printing plate to be removed while maintaining a constant printing result. The required degree of reduction of the dampening solution supply with a reduced peripheral speed of the dampening roller depends on the respective setting of the printing press and can be determined empirically in a simple manner. Once the suitable setting has been found, the switchover can take place automatically without manual intervention by the printer. A device suitable for this is specified in claim 3.

Die Änderung der Feuchtmittelzufuhr kann je nach Ausgestaltung des Feuchtwerks auf unterschiedliche Weise erfolgen. Vorteilhaft ist ein Methode bei der die Reduzierung der Feuchtmittelzufuhr durch Absenken der Drehzahl der separat angetriebenen Tauchwalze des Feuchtwerks, beispielsweise eines Drei-Walzen-Feuchtwerks, erfolgt.The dampening solution supply can be changed in different ways depending on the design of the dampening unit. A method is advantageous in which the dampening solution supply is reduced by lowering the speed of the separately driven immersion roller of the dampening unit, for example a three-roller dampening unit.

Es wurde gefunden, daß das erfindungsgemäße Verfahren sich insbesondere bei Ausbildung einer verchromten, polierten Walzenoberfläche auf der Feuchtmittel an die Feuchtauftragwalze zuführenden Walze bewährt hat.It has been found that the process according to the invention has proven itself in particular when a chrome-plated, polished roller surface is formed on the dampening solution on the roller supplying the dampening roller.

Das Verfahren nach der Erfindung wird nachfolgend anhand eines Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung näher erläutert, das in der Zeichnung dargestellt ist.The method according to the invention is explained in more detail below using an exemplary embodiment of a device according to the invention, which is shown in the drawing.

Die Zeichnung zeigt das Walzenschema eines Feuchtwerks einer Rotations-Offset-Druckmaschine. Das dargestellte Feuchtwerk besteht aus einem Drei-Walzen-System, das eine Feuchtauftragwalze 3, eine Tauchwalze 4 und eine Dosierwalze 5 umfaßt. Die Feuchtauftragwalze 3 ist mit einem Plattenzylinder 7 in Kontakt, um auf diesen Feuchtmittel zu übertragen. Sie wird gemeinsam mit dem Plattenzylinder 7 durch den Antrieb der Druckmaschine angetrieben. Unter der Feuchtauftragwalze 3 ist die Tauchwalze 4 angeordnet, die aus einem Feuchtmittelbehälter 9 Feuchtmittel entnimmt und auf die Feuchtauftragwalze 3 überträgt. Die an der Tauchwalze 4 anliegende Dosierwalze 5 sorgt in bekannter Weise für eine gleichmäßige Verteilung des Feuchtmittels auf der Oberfläche der Tauchwalze 4 und bestimmt die Dicke des Feuchtmittelfilms. Beide Walzen, die Tauchwalze 4 und die Dosierwalze 5, werden von einem gemeinsamen separaten Antrieb, z.B. einem Elektromotor angetrieben, dessen Antriebsdrehzahl regelbar ist.The drawing shows the roller diagram of a dampening unit of a rotary offset printing machine. The dampening system shown consists of a three-roller system which comprises a dampening roller 3, an immersion roller 4 and a metering roller 5. The dampening roller 3 is in contact with a plate cylinder 7 to transfer to this dampening solution. It is driven together with the plate cylinder 7 by the drive of the printing press. Under the The dampening roller 3 is the immersion roller 4, which takes the dampening solution from a dampening solution tank 9 and transfers it to the dampening roller 3. The dosing roller 5 abutting the dipping roller 4 ensures, in a known manner, a uniform distribution of the dampening solution on the surface of the dipping roller 4 and determines the thickness of the dampening solution film. Both rollers, the dipping roller 4 and the metering roller 5, are driven by a common separate drive, for example an electric motor, the drive speed of which can be regulated.

Über der Feuchtauftragwalze 3 befindet sich eine angetriebene Brückenwalze 2, die an der Feuchtauftragwalze 3 und einer Farbauftragwalze 1 eines nur teilweise dargestellten Farbwerks 10 anliegt. Zusätzlich kann eine Tandemwalze 6 vorgesehen sein, die mit der Brückenwalze 2 und der Feuchtauftragwalze 3 zusammenwirkt. Mit 8 ist der das Druckbild übertragende Gummituchzylinder bezeichnet.Above the dampening roller 3 there is a driven bridge roller 2 which bears against the dampening roller 3 and an inking roller 1 of an inking unit 10 which is only partially shown. In addition, a tandem roller 6 can be provided which interacts with the bridge roller 2 and the dampening roller 3. With 8 the blanket cylinder transmitting the printed image is designated.

Im Normalbetrieb werden der Plattenzylinder 7 und die Feuchtauftragwalze 3 mit der gleichen Umfangsgeschwindigkeit angetrieben, wobei der Plattenzylinder 7 mit Maschinengeschwindigkeit rotiert. Die Drehzahl und damit die Umfangsgeschwindigkeit der Tauchwalze 4 und der Dosierwalze 5 richtet sich nach der jeweils erforderlichen Dosierung der Feuchtmittelzufuhr. Die Umfangsgeschwindigkeit der Tauchwalze 4 kann dabei von der Umfangsgeschwindigkeit der Feuchtauftragwalze 3 abweichen.In normal operation, the plate cylinder 7 and the dampening roller 3 are driven at the same peripheral speed, the plate cylinder 7 rotating at the machine speed. The speed and thus the peripheral speed of the dipping roller 4 and the metering roller 5 depends on the required dosage of the dampening solution supply. The peripheral speed of the dipping roller 4 can deviate from the peripheral speed of the dampening roller 3.

Haben sich auf der Druckplatte Butzen gebildet, die entfernt werden sollen, so wird beispielsweise mit Hilfe eines Schaltgetriebes die Antriebsdrehzahl der Feuchtauftragwalze 3 etwa um 5 - 10% herabgesetzt, während der Plattenzylinder 7 mit Maschinengeschwindigkeit weiter rotiert. Durch die auf diese Weise verringerte Umfangsgeschwindigkeit der Feuchtauftragwalze 3 entsteht auf der Druckplatte des Plattenzylinders 7 ein Wischeffekt, wodurch Butzen auf der Druckplatte entfernt werden. Es wurde nun gefunden, daß beim Umschalten auf Betrieb mit Wischeffekt ohne eine Änderung der Einstellung des Feuchtwerks das Feuchtmittelangebot an der Druckplatte entgegen allen Erwartungen nicht absondern zunimmt, so daß das Druckbild verblaßt und die Gefahr besteht, daß Feuchtmittel in das Farbwerk gelangt. Um dies zu vermeiden, wird erfindungsgemäß gleichzeitig mit der Umschaltung des Antriebs der Feuchtauftragwalze 3 auf geringere Drehzahl die Antriebsdrehzahl der Tauchwalze 4 und der Dosierwalze 5 soweit reduziert, daß das Farb-Feuchtigkeitsgleichgewicht unverändert bleibt. Nach Beseitigung der Butzen wird wieder auf Normalbetrieb zurückgeschaltet, d.h. die Umfangsgeschwindigkeit der Feuchtauftragwalze 3 wird wieder an die Umfangsgeschwindigkeit des Plattenzylinders 7 angeglichen und die Antriebsdrehzahlen der Tauchwalze 4 und der Dosierwalze 5 werden wieder auf den zuvor eingestellten Wert zurückgeschaltet.If slugs have formed on the printing plate that are to be removed, the drive speed of the dampening roller 3 is reduced by approximately 5 to 10%, for example with the aid of a gearbox, while the plate cylinder 7 continues to rotate at machine speed. Due to the reduced peripheral speed of the dampening roller 3 in this way arises on the pressure plate of the plate cylinder 7 a wiping effect, whereby slugs on the printing plate are removed. It has now been found that, contrary to all expectations, the supply of dampening solution on the printing plate does not increase when switching to operation with a wiping effect without changing the setting of the dampening unit, so that the printed image fades and there is a risk of dampening solution getting into the inking unit. In order to avoid this, according to the invention, the drive speed of the dipping roller 4 and the metering roller 5 is reduced to the extent that the ink-moisture balance remains unchanged simultaneously with the switching of the drive of the dampening roller 3 to a lower speed. After removal of the slugs, the system is switched back to normal operation, ie the peripheral speed of the dampening roller 3 is adjusted again to the peripheral speed of the plate cylinder 7 and the drive speeds of the dipping roller 4 and the metering roller 5 are switched back to the previously set value.

Claims (3)

Verfahren zur Beseitigung von Butzen auf der Druckplatte eines Plattenzylinders einer Druckmaschine, bei dem die normalerweise der Umfangsgeschwindigkeit der Druckplatte entsprechende Umfangsgeschwindigkeit einer Feuchtauftragwalze eines Feuchtwerks vorübergehend verringert und gleichzeitig die zur Dosierung der Feuchtmittelzufuhr unabhängig regelbare Drehgeschwindigkeit einer Feuchtmittel zuführenden Walze geändert wird, dadurch gekennzeichnet, daß die Drehgeschwindigkeit der Feuchtmittel zuführenden Walze (4) bei Verringerung der Umfangsgeschwindigkeit der Feuchtauftragwalze (3) derart geändert wird, daß die Feuchtmittelzufuhr zur Feuchtauftragwalze (3) reduziert wird und daß beim erneuten Angleichen der Umfangsgeschwindigkeit der Feuchtauftragwalze (3) an die Umfangsgeschwindigkeit der Druckplatte (7) die Drehgeschwindigkeit der Feuchtmittel zuführenden Walze (4) auf den vorherigen Wert zurückgestellt wird.Method for eliminating slugs on the printing plate of a plate cylinder of a printing press, in which the peripheral speed of a dampening roller of a dampening unit, which normally corresponds to the peripheral speed of the printing plate, is temporarily reduced and, at the same time, the rotational speed of a dampening roller feeding roller, which can be controlled independently for metering the fountain solution supply, is changed, characterized in that the rotation speed of the dampening roller (4) is changed while reducing the peripheral speed of the dampening roller (3) in such a way that the dampening solution supply to the dampening roller (3) is reduced and that when the peripheral speed of the dampening roller (3) is again adjusted to the peripheral speed of the printing plate ( 7) the rotation speed of the dampening roller (4) is reset to the previous value. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Reduzierung der Feuchtmittelzufuhr durch Absenken der Drehzahl der separat angetriebenen Tauchwalze (4) des Feuchtwerks erfolgt.Method according to Claim 1, characterized in that the dampening solution supply is reduced by lowering the speed of the separately driven plunger roller (4) of the dampening unit. Vorrichtung zum Zuführen von Farbe und Feuchtmittel zum Plattenzylinder einer Rotations-Offset-Druckmaschine, mit einem Farbwerk mit mindestens einer am Plattenzylinder anliegenden Farbauftragwalze, einem Feuchtwerk mit mindestens einer am Plattenzylinder anliegenden Feuchtauftragwalze und einer dieser Feuchtmittel zuführenden Walze, deren Drehgeschwindigkeit zur Dosierung der Feuchtmittelzufuhr unabhängig regelbar ist, wobei die Feuchtauftragwalze durch Umsteuern ihres Antriebs entweder mit der gleichen Umfangsgeschwindigkeit wie der Plattenzylinder oder mit einer gegenüber dem Plattenzylinder geringeren Umfangsgeschwindigkeit antreibbar ist, dadurch gekennzeichnet, daß die Steuerung der Drehgeschwindigkeit der Feuchtmittel zuführenden Walze (4) mit dem Antrieb der Feuchtauftragwalze (3) oder seiner Steuerung derart verknüpft ist, daß beim Umsteuern des Antriebs der Feuchtauftragwalze (3) auf geringere Umfangsgeschwindigkeit gleichzeitig die Drehgeschwindigkeit der Feuchtmittel zuführenden Walze (4) auf einen vorgegebenen Wert verringert und beim Zurückschalten wieder auf den vorherigen Wert erhöht wird.Device for supplying ink and dampening solution to the plate cylinder of a rotary offset printing machine, with an inking unit with at least one inking roller resting on the plate cylinder, a dampening unit with at least one dampening roller resting on the plate cylinder and one of these dampening agents Roller whose rotational speed for metering the dampening solution supply can be controlled independently, the dampening roller being drivable by reversing its drive either with the same peripheral speed as the plate cylinder or with a lower peripheral speed compared to the plate cylinder, characterized in that the control of the rotating speed of the dampening roller feeding (4) is linked to the drive of the dampening roller (3) or its control in such a way that when the drive of the dampening roller (3) is reversed to a lower peripheral speed, the rotational speed of the dampening roller (4) is simultaneously reduced to a predetermined value and when switching back again is increased to the previous value.
EP95103230A 1994-03-24 1995-03-07 Method and means for removing hickies from the printing plate in a printing machine Expired - Lifetime EP0673770B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4410161A DE4410161C2 (en) 1994-03-24 1994-03-24 Method and device for removing slugs on the printing plate of a printing press
DE4410161 1994-03-24

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EP0673770A1 true EP0673770A1 (en) 1995-09-27
EP0673770B1 EP0673770B1 (en) 1997-04-16

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EP95103230A Expired - Lifetime EP0673770B1 (en) 1994-03-24 1995-03-07 Method and means for removing hickies from the printing plate in a printing machine

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EP (1) EP0673770B1 (en)
AT (1) ATE151696T1 (en)
DE (2) DE4410161C2 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP0839652A2 (en) * 1996-11-02 1998-05-06 MAN Roland Druckmaschinen AG Method for cleaning cylinders and rollers in a printing machine

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DE19902957C2 (en) * 1999-01-26 2003-05-28 Roland Man Druckmasch Dosing device on a rotary printing machine

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GB2007156A (en) * 1977-11-05 1979-05-16 Maschf Augsburg Nuernberg Ag Rotary Offset Printing Machine
GB2139561A (en) * 1983-05-11 1984-11-14 Baldwin Technology Corp Dampening system
EP0478493A1 (en) * 1990-09-11 1992-04-01 Sun Graphic Technologies, Inc. Press dampening system

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DD238574A1 (en) * 1985-06-25 1986-08-27 Polygraph Leipzig METHOD AND DEVICE FOR REMOVING PUTTING ON THE PRESSURE PLATE

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Publication number Priority date Publication date Assignee Title
GB2007156A (en) * 1977-11-05 1979-05-16 Maschf Augsburg Nuernberg Ag Rotary Offset Printing Machine
GB2139561A (en) * 1983-05-11 1984-11-14 Baldwin Technology Corp Dampening system
EP0478493A1 (en) * 1990-09-11 1992-04-01 Sun Graphic Technologies, Inc. Press dampening system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0839652A2 (en) * 1996-11-02 1998-05-06 MAN Roland Druckmaschinen AG Method for cleaning cylinders and rollers in a printing machine
EP0839652A3 (en) * 1996-11-02 1998-12-02 MAN Roland Druckmaschinen AG Method for cleaning cylinders and rollers in a printing machine

Also Published As

Publication number Publication date
DE59500182D1 (en) 1997-05-22
EP0673770B1 (en) 1997-04-16
DE4410161C2 (en) 1998-02-26
ATE151696T1 (en) 1997-05-15
DE4410161A1 (en) 1995-10-05

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