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EP0813961A1 - Offset printing device for rotary press - Google Patents

Offset printing device for rotary press Download PDF

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Publication number
EP0813961A1
EP0813961A1 EP97106619A EP97106619A EP0813961A1 EP 0813961 A1 EP0813961 A1 EP 0813961A1 EP 97106619 A EP97106619 A EP 97106619A EP 97106619 A EP97106619 A EP 97106619A EP 0813961 A1 EP0813961 A1 EP 0813961A1
Authority
EP
European Patent Office
Prior art keywords
plate cylinder
inking
rollers
offset printing
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97106619A
Other languages
German (de)
French (fr)
Other versions
EP0813961B1 (en
Inventor
Peter Hummel
Robert Ortner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Filing date
Publication date
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Publication of EP0813961A1 publication Critical patent/EP0813961A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/04—Cleaning arrangements or devices for inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/20—Wiping devices
    • B41P2235/22—Rollers

Definitions

  • the invention relates to an offset printing device for rotary printing presses according to the preamble of claim 1.
  • An offset printing device of this type is known from DE 44 23 286 A1.
  • a plate cylinder carries a printing form suitable for dampening agent-free offset printing (dry flat printing), which is colored with an appropriate printing ink.
  • an additional application roller can be turned on and off the printing form regardless of the ink rollers present.
  • the additional applicator roller can be switched in two operating positions. In the first operating position, the application roller is set against the printing form and can be operated at a different peripheral speed to the peripheral speed of the plate cylinder, and in the second operating position the application roller is set off from the printing form, but integrated into the inking unit.
  • a wet offset printing device is known from DE-AS 18 08 909.
  • at least one applicator roller from the dampening or inking unit can be driven (with a positive fit) at different circumferential speeds to the circumferential speed of the plate cylinder.
  • This procedure is unsuitable for a dry offset plate, which has a non-metallic surface coating, since the dry planographic printing plate is less wear-resistant for offset printing than a dampening medium-carrying printing plate.
  • the impurities are transported further to a roller in the inking unit or dampening unit, where the accumulated impurities have to be removed at certain intervals, e.g. in the inking unit.
  • the object of the invention is to develop an offset printing device which noticeably reduces the contamination that occurs during offset printing.
  • all ink rollers that can be operated in a form-fitting manner are operated with a circumferential speed that is different from the peripheral speed of the plate cylinder, the inking rollers themselves not having a form-fitting drive.
  • the form-fittingly driven inking rollers within the inking unit are rotated in stages with mutually different circumferential speeds to the plate cylinder circumferential speed.
  • the inking rollers arranged closer to the plate cylinder within the inking unit are preferably operated with fewer, the inking rollers arranged further away from the plate cylinder are preferably operated with a greater difference in their peripheral speeds from the peripheral speed of the plate cylinder.
  • a difference in the circumferential speeds of the form-operated inking rollers is built up within the inking unit, which, for example, is 2% for at least one inking roller adjacent to the plate cylinder and one that is furthest away from the plate cylinder, e.g. the ink lifter adjacent to the inking roller in the roller train is 10% of the peripheral speed of the plate cylinder.
  • the positively driven ink rollers based on the peripheral speed of the plate cylinder, preferably rotate overall at a lower peripheral speed. Alternatively, a higher differential speed to the peripheral speed of the plate cylinder is also permissible.
  • a rotational slip forms at each roller contact point of the inking unit.
  • the rotation slip is formed in particular on the inking rollers by two contact points, the first to the plate cylinder and the second to the adjacent, form-fittingly operated inking unit roller.
  • the rotational slip forms the Wipe effect " which reduces the contamination (paper dust, slugs, etc.) that occurs in the inking unit.
  • the impurities in the contact points are destroyed or noticeably reduced, so that there are no negative effects on the print quality.
  • One known from the prior art This eliminates the need for dirt trap rollers.
  • the intervals between the washing cycles for inking unit washing can be increased, which also saves detergent and water.
  • the plastic-coated inking unit rollers, which experience has shown are susceptible to build-up, do not need to be substituted.
  • the form-fitting rotating ink rollers which are driven at a differential speed to the plate cylinder circumferential speed, can also be driven in a form-fitting, axially oscillating (oscillating) manner.
  • the traversing movement is also frictionally transmitted to the non-driven inking unit rollers.
  • this creates an axial slip within each roller contact point.
  • the design of the offset printing device is suitable for waterless offset printing (dry flat printing) as well as for wet offset printing using a dampening unit.
  • a printing unit comprises a blanket cylinder 1 and a plate cylinder 2 which carries a dry flat printing plate for waterless offset printing.
  • Four inking rollers 4.1 to 4.4 can be switched on and off assigned to the plate cylinder 2.
  • the inking rollers 4.1 to 4.4 are part of an inking unit 5 formed by a plurality of inking rollers, which inks the dry flat printing plate with a printing ink suitable for waterless offset printing.
  • the printing ink is transferred to the dry flat printing plate in a known manner from an ink fountain via a lifter roller and a roller train of the inking unit 5.
  • the inking rollers 3.1-3.4 have a traversing drive.
  • the transfer rollers adjacent to the inking rollers 3.1 - 3.4 (without position number) and the inking rollers 4.1 - 4.4 are changeable.
  • the mode of operation is as follows: In printing operation, the inking rollers 3.1-3.4 are constantly driven at a peripheral speed which differs from the peripheral speed of the plate cylinder.
  • the difference in circumferential speeds in the present example is a maximum of 6% and a minimum of 2% or 0% to the circumferential speed of the plate cylinder 2.
  • the circumferential speeds of the inking rollers 3.1-3.4 are always lower than the circumferential speed of the plate cylinder 2.
  • the rotational and oscillating movement of the Ink rollers 3.1 - 3.4 are frictionally transferred to the adjacent rollers of the inking unit 5.
  • the impurities dirty particles, dust, paper and paint particles
  • the printing unit comprises a blanket cylinder 1, a plate cylinder 2 which carries a printing plate for wet offset printing and an inking unit 5.
  • the plate cylinder 2 is also assigned a dampening unit 6 which has a dampening roller 7 which can be switched on and off.
  • the dampening roller 7 is coupled in a known manner to a dampening roller which is immersed in a dampening solution container.
  • a metering roller is assigned to the dampening roller.
  • the dampening roller 7 is arranged adjacent to a bridge roller to the first inking roller 4.1. If necessary, a further rider roller can be assigned to the dampening roller 7.
  • the inking unit 5 has form-fit drivable inking rollers 3.1-3.4 which, in addition to the rotary drive, have a traversing drive.
  • the transfer or inking rollers 4.1-4.4 adjacent to the inking rollers 3.1-3.4 are in frictional contact with the inking rollers 3.1-3.4.
  • the inking roller 3.3 is operated as the most positively drivable roller from the plate cylinder with the greatest difference in the peripheral speed from the plate cylinder peripheral speed.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Testing Of Balance (AREA)

Abstract

The printing device has an inking unit (5) containing inking rolls (3.1-3.4) rotating positively and in contact with transfer rolls and ink applying rolls (4.1-4.4) The inking rolls can be driven at a circumferential speed differing from that of the plate cylinder (2). Those colour rolls (3.3 and 3.1) which are remote from the plate cylinder are driven at a greater difference in circumferential speed from that of the plate cylinder than those (3.2,3.4) which are adjacent to the plate cylinder and in friction contact with the changeable ink applying rolls.

Description

Die Erfindung betrifft eine Offsetdruckvorrichtung für Rotationsdruckmaschinen nach dem Oberbegriff des Patentanspruches 1.The invention relates to an offset printing device for rotary printing presses according to the preamble of claim 1.

Eine Offsetdruckvorrichtung dieser Art ist aus der DE 44 23 286 A1 bekannt. Ein Plattenzylinder trägt dabei eine für den feuchtmittelfreien Offsetdruck (Trockenflachdruck) geeignete Druckform, welche mit einer entsprechenden Druckfarbe eingefärbt wird. Zur Beseitigung bzw. zum Verhindern von Verunreinigungen, die sich negativ im Druckbild auf den Bedruckstoff widerspiegeln, ist unabhängig von den vorhandenen Farbwalzen eine zusätzliche Auftragwalze an die Druckform an- und abstellbar. Die zusätzliche Auftragwalze ist in zwei Betriebsstellungen schaltbar. Dabei ist in der ersten Betriebsstellung die Auftragwalze an der Druckform angestellt und mit einer differierenden Umfangsgeschwindigkeit zur Umfangsgeschwindigkeit des Plattenzylinders betreibbar und in der zweiten Betriebsstellung ist die Auftragwalze von der Druckform abgestellt, jedoch in das Farbwerk integriert.An offset printing device of this type is known from DE 44 23 286 A1. A plate cylinder carries a printing form suitable for dampening agent-free offset printing (dry flat printing), which is colored with an appropriate printing ink. To remove or prevent contamination, which is reflected negatively in the print image on the printing material, an additional application roller can be turned on and off the printing form regardless of the ink rollers present. The additional applicator roller can be switched in two operating positions. In the first operating position, the application roller is set against the printing form and can be operated at a different peripheral speed to the peripheral speed of the plate cylinder, and in the second operating position the application roller is set off from the printing form, but integrated into the inking unit.

Aus der DE-AS 18 08 909 ist eine Naß-Offset-Druckvorrichtung bekannt. Zum Entfernen von Verunreinigungen auf der Druckform ist mindestens eine Auftragwalze von Feucht- oder Farbwerk mit unterschiedlicher Umfangsgeschwindigkeit zur Umfangsgeschwindigkeit des Plattenzylinders mittels einer Zahnradfolge (formschlüssig) antreibbar. Diese Verfahrensweise ist für eine Trocken-Offsetplatte, welche eine nichtmetallische Oberflächenbeschichtung aufweist, ungeeignet, da die Trocken-Flachdruckplatte gegenüber einer feuchtmittelführenden Druckplatte für den Offsetdruck weniger verschleißfest ist. Weiterhin werden die Verunreinigungen in das Farbwerk bzw. Feuchtwerk an eine Walze weiter transportiert, wo die angesammelten Verunreinigungen in bestimmten Abständen z.B. im Farbwerk entfernt werden müssen.A wet offset printing device is known from DE-AS 18 08 909. In order to remove impurities on the printing form, at least one applicator roller from the dampening or inking unit can be driven (with a positive fit) at different circumferential speeds to the circumferential speed of the plate cylinder. This procedure is unsuitable for a dry offset plate, which has a non-metallic surface coating, since the dry planographic printing plate is less wear-resistant for offset printing than a dampening medium-carrying printing plate. Furthermore, the impurities are transported further to a roller in the inking unit or dampening unit, where the accumulated impurities have to be removed at certain intervals, e.g. in the inking unit.

Aufgabe der Erfindung ist es, eine Offsetdruckvorrichtung zu entwickeln, welche die beim Offsetdruck auftretenden Verschmutzungen spürbar reduziert.The object of the invention is to develop an offset printing device which noticeably reduces the contamination that occurs during offset printing.

Erfindungsgemäß werden im Farbwerk alle formschlüssig betreibbaren Farbwalzen mit zur Umfangsgeschwindigkeit des Plattenzylinders unterschiedlicher Umfangsgeschwindigkeit betrieben, wobei die Farbauftragwalzen selbst keinen formschlüssigen Antrieb aufweisen. Dazu werden die formschlüssig angetriebenen Farbwalzen innerhalb des Farbwerkes stufenweise mit zueinander abweichenden Umfangsgeschwindigkeiten zur Plattenzylinderumfangsgeschwindigkeit rotierend angetrieben. Die innerhalb des Farbwerkes dem Plattenzylinder näher angeordneten Farbwalzen werden dabei vorzugsweise mit geringerer, die dem Plattenzylinder weiter entfernt angeordneten Farbwalzen werden dabei vorzugsweise mit größerer Differenz in ihren Umfangsgeschwindigkeiten zur Umfangsgeschwindigkeit des Plattenzylinders betrieben. Dadurch wird innerhalb des Farbwerkes ein Differenzgefälle der Umfangsgeschwindigkeiten der formschlüssig betriebenen Farbwalzen aufgebaut, welches beispielsweise bei wenigstens einer, dem Plattenzylinder benachbarten Farbauftragwalze 2% und bei einer dem Plattenzylinder am weitesten entfernten, z.B. dem Farbheber benachbarten, Farbwalze im Walzenzug 10% zur Umfangsgeschwindigkeit des Plattenzylinders beträgt. Dabei rotieren die formschlüssig angetriebenen Farbwalzen, bezogen auf die Umfangsgeschwindigkeit des Plattenzylinders, vorzugsweise insgesamt mit geringerer Umfangsgeschwindigkeit. Alternativ ist ebenso eine höhere Differenzgeschwindigkeit zur Umfangsgeschwindigkeit des Plattenzylinders zulässig.According to the invention, in the inking unit, all ink rollers that can be operated in a form-fitting manner are operated with a circumferential speed that is different from the peripheral speed of the plate cylinder, the inking rollers themselves not having a form-fitting drive. For this purpose, the form-fittingly driven inking rollers within the inking unit are rotated in stages with mutually different circumferential speeds to the plate cylinder circumferential speed. The inking rollers arranged closer to the plate cylinder within the inking unit are preferably operated with fewer, the inking rollers arranged further away from the plate cylinder are preferably operated with a greater difference in their peripheral speeds from the peripheral speed of the plate cylinder. As a result, a difference in the circumferential speeds of the form-operated inking rollers is built up within the inking unit, which, for example, is 2% for at least one inking roller adjacent to the plate cylinder and one that is furthest away from the plate cylinder, e.g. the ink lifter adjacent to the inking roller in the roller train is 10% of the peripheral speed of the plate cylinder. The positively driven ink rollers, based on the peripheral speed of the plate cylinder, preferably rotate overall at a lower peripheral speed. Alternatively, a higher differential speed to the peripheral speed of the plate cylinder is also permissible.

Durch die Abstufung der Differenzgeschwindigkeiten der Farbwerkswalzen zur Umfangsgeschwindigkeit des Plattenzylinders bildet sich an jeder Walzenkontaktstelle des Farbwerkes ein Rotationsschlupf aus. Der Rotationsschlupf ist insbesondere an den Farbauftragwalzen durch zwei Kontaktstellen, wobei die erste zum Plattenzylinder und die zweite zur benachbarten, formschlüssig betriebenen Farbwerkswalze besteht, gebildet. Der Rotationsschlupf bildet den

Figure imgb0001
Wischeffekt" der im Farbwerk die auftretenden Verschmutzungen (Papierstaub, Butzen etc.) reduziert. Dabei werden die Verunreinigungen in den Kontaktstellen zerstört oder spürbar verkleinert, so daß negative Auswirkungen auf die Druckqualität ausbleiben. Eine aus dem Stand der Technik bekannte
Figure imgb0001
Schmutzfängerwalze" ist dadurch hinfällig. Die Abstände der Waschzyklen beim Farbwerkswaschen können dadurch vergrößert werden, was zusätzlich Waschmittel und Wasser spart. Die kunststoffbeschichteten Farbwerkswalzen, welche erfahrungsgemäß anfällig für den Aufbau für Verunreinigungen sind, brauchen nicht substituiert zu werden.Due to the gradation of the differential speeds of the inking unit rollers to the peripheral speed of the plate cylinder, a rotational slip forms at each roller contact point of the inking unit. The rotation slip is formed in particular on the inking rollers by two contact points, the first to the plate cylinder and the second to the adjacent, form-fittingly operated inking unit roller. The rotational slip forms the
Figure imgb0001
Wipe effect " which reduces the contamination (paper dust, slugs, etc.) that occurs in the inking unit. The impurities in the contact points are destroyed or noticeably reduced, so that there are no negative effects on the print quality. One known from the prior art
Figure imgb0001
This eliminates the need for dirt trap rollers. The intervals between the washing cycles for inking unit washing can be increased, which also saves detergent and water. The plastic-coated inking unit rollers, which experience has shown are susceptible to build-up, do not need to be substituted.

Um das Auftreten von Verunreinigungen noch stärker zu reduzieren können die formschlüssig rotierenden, mit Differenzgeschwindigkeit zur Plattenzylinderumfangsgeschwindigkeit angetriebenen Farbwalzen zusätzlich noch formschlüssig axial oszillierend (changierend) angetrieben werden. Die Changierbewegung wird reibschlüssig auch auf die nicht angetriebenen Farbwerkswalzen übertragen. Dadurch entsteht neben dem Rotationsschlupf ein Axialschlupf innerhalb jeder Walzenkontaktstelle. Durch diesen zusätzlichen Axialschlupf werden die Verschmutzungen zusätzlich verkleinert und können weiter reduziert werden bzw. wird das Entstehen von Verschmutzungen von Beginn an verhindert. Die Ausbildung der Offsetdruckvorrichtung eignet sich dabei für den wasserlosen Offsetdruck (Trocken-Flachdruck) als auch für den Naß-Offsetdruck unter Verwendung eines Feuchtwerkes.In order to reduce the occurrence of contamination even more, the form-fitting rotating ink rollers, which are driven at a differential speed to the plate cylinder circumferential speed, can also be driven in a form-fitting, axially oscillating (oscillating) manner. The traversing movement is also frictionally transmitted to the non-driven inking unit rollers. In addition to the rotational slip, this creates an axial slip within each roller contact point. With this additional axial slip, the contamination is further reduced and can be further reduced or the formation of contamination is prevented from the start. The design of the offset printing device is suitable for waterless offset printing (dry flat printing) as well as for wet offset printing using a dampening unit.

Die Erfindung soll an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail using an exemplary embodiment.

Dabei zeigt:

Fig. 1
eine schematische Darstellung eines Druckwerkes für den wasserlosen Offsetdruck,
Fig. 2
eine schematische Darstellung eines Druckwerkes für den Naß-Offsetdruck.
It shows:
Fig. 1
1 shows a schematic representation of a printing unit for waterless offset printing,
Fig. 2
is a schematic representation of a printing unit for wet offset printing.

Erstes BeispielFirst example

Ein erfindungsgemäßes Druckwerk umfaßt einen Gummituchzylinder 1 sowie einen Plattenzylinder 2, der eine Trockenflachdruckplatte für den wasserlosen Offsetdruck trägt. Dem Plattenzylinder 2 sind vier Farbauftragwalzen 4.1 bis 4.4 an- und abstellbar zugeordnet. Die Farbauftragwalzen 4.1 bis 4.4 sind Bestandteil eines durch eine Mehrzahl von Farbwalzen gebildeten Farbwerkes 5, welches die Trockenflachdruckplatte mit einer für den wasserlosen Offsetdruck geeigneten Druckfarbe einfärbt. Dazu wird in bekannter Weise von einem Farbkasten über eine Heberwalze und einen Walzenzug des Farbwerkes 5 die Druckfarbe auf die Trockenflachdruckplatte übertragen.A printing unit according to the invention comprises a blanket cylinder 1 and a plate cylinder 2 which carries a dry flat printing plate for waterless offset printing. Four inking rollers 4.1 to 4.4 can be switched on and off assigned to the plate cylinder 2. The inking rollers 4.1 to 4.4 are part of an inking unit 5 formed by a plurality of inking rollers, which inks the dry flat printing plate with a printing ink suitable for waterless offset printing. For this purpose, the printing ink is transferred to the dry flat printing plate in a known manner from an ink fountain via a lifter roller and a roller train of the inking unit 5.

Die Farbauftragwalze 4.1 bis 4.4 sind changierbar im Kontakt mit antreibbaren Farbwalzen 3.1 - 3.4, die im vorliegenden Beispiel zusätzlich als Farbreiberwalzen ausgebildet sind. Die Farbwalzen 3.1 - 3.4 sind formschlüssig mit dem Plattenzylinder 2 getriebetechnisch gekoppelt und erhalten neben dem Rotationsantrieb einen Changierantrieb. Dabei erhalten auch die Farbauftragwalzen 4.1 - 4.4 von den Farbwalzen 3.1 - 3.4 reibschlüssig einen changierenden Antrieb. In einer weiteren Ausbildung kann auch jede Farbwalze 3.1 - 3.4 einen Einzelantrieb oder auch einen gemeinsamen, jedoch vom Plattenzylinder 2 entkoppelten, Antrieb aufweisen. Die vom Plattenzylinder 2 am weitesten entfernt angeordnete Farbwalze 3.3 wird dabei mit größerer Differenz der Umfangsgeschwindigkeit zur Umfangsgeschwindigkeit des Plattenzylinders 2 angetrieben als die dem Plattenzylinder 2 näher angeordneten Farbwalzen 3.2 und 3.4. Die im Walzenzug des Farbwerkes 5 etwa mittig angeordnete Farbwalze 3.1 wird mit dazwischenliegender Differenzgeschwindigkeit betrieben. Das Differenzgefälle wird dabei derart gestuft ausgebildet, daß die:

  • Farbwalze 3.2 mit 2%
  • Farbwalze 3.1 mit 4%
  • Farbwalze 3.3 mit 6%
Differenzgeschwindigkeit zur Umfangsgeschwindigkeit formschlüssig angetrieben wird. Die Farbwalze 3.4 kann dabei mit 0 % oder 2 % (analog zur Farbwalze 3.2) formschlüssig angetrieben werden.The inking rollers 4.1 to 4.4 are changeable in contact with drivable inking rollers 3.1 - 3.4, which in the present example are additionally designed as inking rollers. The inking rollers 3.1 - 3.4 are positively coupled to the plate cylinder 2 in terms of gear technology and, in addition to the rotary drive, are provided with a traversing drive. The inking rollers 4.1 - 4.4 also receive a shimmering drive from the inking rollers 3.1 - 3.4. In a further embodiment, each inking roller 3.1-3.4 can also have an individual drive or also a common drive, but decoupled from the plate cylinder 2. The ink roller 3.3 which is furthest away from the plate cylinder 2 becomes the greater the difference in peripheral speed Circumferential speed of the plate cylinder 2 driven than the ink rollers 3.2 and 3.4 arranged closer to the plate cylinder 2. The inking roller 3.1, which is arranged approximately centrally in the roller train of the inking unit 5, is operated with an intermediate differential speed. The differential gradient is designed so that the:
  • Ink roller 3.2 with 2%
  • Ink roller 3.1 with 4%
  • Ink roller 3.3 with 6%
Differential speed to the peripheral speed is positively driven. The inking roller 3.4 can be driven positively with 0% or 2% (analogous to the inking roller 3.2).

Zusätzlich zum Rotationsantrieb weisen die Farbwalzen 3.1 - 3.4 einen Changierantrieb auf. Die den Farbwalzen 3.1 - 3.4 benachbarten Übertragwalzen (ohne Positionsnummer) sowie die Farbauftragwalzen 4.1 - 4.4 sind changierbar gelagert.In addition to the rotary drive, the inking rollers 3.1-3.4 have a traversing drive. The transfer rollers adjacent to the inking rollers 3.1 - 3.4 (without position number) and the inking rollers 4.1 - 4.4 are changeable.

Die Wirkungsweise ist wie folgt: Im Druckbetrieb werden die Farbwalzen 3.1 - 3.4 ständig mit einer zur Umfangsgeschwindigkeit des Plattenzylinders abweichenden Umfangsgeschwindigkeit angetrieben. Dabei beträgt die Differenz der Umfangsgeschwindigkeiten im vorliegenden Beispiel maximal 6% und minimal 2% bzw. 0 % zu der Umfangsgeschwindigkeit des Plattenzylinders 2. Die Umfangsgeschwindigkeiten der Farbwalzen 3.1 - 3.4 sind stets geringer als die Umfangsgeschwindigkeit des Plattenzylinders 2. Die Rotations- und Changierbewegung der Farbwalzen 3.1 - 3.4 wird reibschlüssig auf die benachbarten Walzen des Farbwerkes 5 übertragen. In den Kontaktstellen, insbesondere zwischen Plattenzylinder 2 und den Farbauftragwalzen 4.1 bis 4.4. werden die Verunreinigungen (Schmutzpartikel, Staub, Papier und Farbpartikel) reduziert. Durch die höheren Differenzgeschwindigkeiten bei den vom Plattenzylinder 2 entfernter angeordneten Farbwalzen 3.3 sowie 3.1 wird das Vordringen von kleineren Verunreinigungen innerhalb des Walzenzuges verhindert. Bei größeren der Verunreinigungen werden die bereits in den Kontaktstellen der Farbwalzen 3.2 und 3.4 verkleinerten Verunreinigungen in den weiter entfernten Kontaktstellen zusätzlich verkleinert.The mode of operation is as follows: In printing operation, the inking rollers 3.1-3.4 are constantly driven at a peripheral speed which differs from the peripheral speed of the plate cylinder. The difference in circumferential speeds in the present example is a maximum of 6% and a minimum of 2% or 0% to the circumferential speed of the plate cylinder 2. The circumferential speeds of the inking rollers 3.1-3.4 are always lower than the circumferential speed of the plate cylinder 2. The rotational and oscillating movement of the Ink rollers 3.1 - 3.4 are frictionally transferred to the adjacent rollers of the inking unit 5. In the contact points, in particular between plate cylinder 2 and the inking rollers 4.1 to 4.4. the impurities (dirt particles, dust, paper and paint particles) are reduced. The higher differential speeds in the case of the inking rollers 3.3 and 3.1 arranged further away from the plate cylinder 2 prevent the ingress of smaller impurities within the roller train. For larger impurities, the ones already reduced in the contact points of the ink rollers 3.2 and 3.4 are reduced Impurities in the more distant contact points are also reduced.

Zweites BeispielSecond example

Das erfindungsgemäße Druckwerk umfaßt wie im ersten Beispiel einen Gummituchzylinder 1, einen Plattenzylinder 2, der eine Druckplatte für den Naß-Offsetdruck trägt und ein Farbwerk 5. Dem Plattenzylinder 2 ist weiterhin ein Feuchtwerk 6 zugeordnet, welches eine an- und abstellbare Feuchtauftragwalze 7 aufweist. Die Feuchtauftragwalze 7 ist in bekannter Weise mit einem Feuchtduktor, der in einem Feuchtmittelbehälter eintaucht, gekoppelt. Dem Feuchtduktor ist eine Dosierwalze zugeordnet. Der Feuchtauftragwalze 7 ist eine Brückenwalze zur ersten Farbauftragwalze 4.1 zuschaltbar benachbart angeordnet. Bei Bedarf kann eine weitere Reiterwalze der Feuchtauftragwalze 7 zugeordnet sein. Das Farbwerk 5 weist formschlüssig antreibbare Farbwalzen 3.1 - 3.4 auf, die neben dem Rotationsantrieb einen Changierantrieb aufweisen. Die den Farbwalzen 3.1 - 3.4 benachbarten Übertrag- bzw. Farbauftragwalzen 4.1 - 4.4 sind reibschlüssig mit den Farbwalzen 3.1 - 3.4 in Kontakt. Dabei wird die Farbwalze 3.3 als vom Plattenzylinder entfernteste formschlüssig antreibbare Walze mit der größten Differenz in der Umfangsgschwindigkeit zur Plattenzylinderumfangsgeschwindigkeit betrieben.As in the first example, the printing unit according to the invention comprises a blanket cylinder 1, a plate cylinder 2 which carries a printing plate for wet offset printing and an inking unit 5. The plate cylinder 2 is also assigned a dampening unit 6 which has a dampening roller 7 which can be switched on and off. The dampening roller 7 is coupled in a known manner to a dampening roller which is immersed in a dampening solution container. A metering roller is assigned to the dampening roller. The dampening roller 7 is arranged adjacent to a bridge roller to the first inking roller 4.1. If necessary, a further rider roller can be assigned to the dampening roller 7. The inking unit 5 has form-fit drivable inking rollers 3.1-3.4 which, in addition to the rotary drive, have a traversing drive. The transfer or inking rollers 4.1-4.4 adjacent to the inking rollers 3.1-3.4 are in frictional contact with the inking rollers 3.1-3.4. The inking roller 3.3 is operated as the most positively drivable roller from the plate cylinder with the greatest difference in the peripheral speed from the plate cylinder peripheral speed.

Analog zum ersten Beispiel beträgt hier das Differenzgefälle der Umfangsgeschwindigkeiten für die:

  • Farbwalze 3.3 = 10%
  • Farbwalze 3.1 = 8%
  • Farbwalze 3.2 = 4%
  • Farbwalze 3.4 = 2%
zur Umfangsgeschwindigkeit des Plattenzylinders 2. Zusätzlich zum Rotationsantrieb weisen die Farbwalzen 3.1 - 3.4 wiederum einen Changierantrieb auf. Die den Farbwalzen 3.1 - 3.4 benachbarten Übertragwalzen sowie die in Kontakt stehenden Farbauftragwalzen 4.1 - 4.4 sind changierbar gelagert.Analogous to the first example, the difference in circumferential speeds for:
  • Ink roller 3.3 = 10%
  • Ink roller 3.1 = 8%
  • Ink roller 3.2 = 4%
  • Ink roller 3.4 = 2%
to the peripheral speed of the plate cylinder 2. In addition to the rotary drive, the inking rollers 3.1 - 3.4 in turn have a traversing drive. The transfer rollers adjacent to the inking rollers 3.1-3.4 and the inking rollers 4.1-4.4 in contact are mounted so that they can be changed.

BezugszeichenlisteReference list

11
GummituchzylinderBlanket cylinder
22nd
PlattenzylinderPlate cylinder
3.1 - 3.43.1 - 3.4
FarbwalzeInk roller
4.1 - 4.44.1 - 4.4
FarbauftragwalzeInking roller
55
FarbwerkInking unit
66
FeuchtwerkDampening system
77
FeuchtauftragwalzeDampening roller

Claims (6)

Offsetdruckvorrichtung für eine Rotationsdruckmaschine mit einem Plattenzylinder und einem Farbwerk mit Walzen zum Auftragen von Druckfarbe auf ein Druckplatte,
dadurch gekennzeichnet,
daß im Farbwerk (5) formschlüssig rotierende, mit Übertragwalzen und Farbauftragwalzen (4.1 - 4.4) in Kontakt stehende Farbwalzen (3.1 - 3.4) mit zur Umfangsgeschwindigkeit des Plattenzylinders (2) abweichender Umfangsgeschwindigkeit antreibbar sind, wobei die dem Plattenzylinder (2) entfernt angeordneten Farbwalzen (3.3 und 3.1) mit einer größeren Differenz der Umfangsgeschwindigkeit als die dem Plattenzylinder (2) benachbart angeordneten, mit changierbaren Farbauftragwalzen (4.1 - 4.4) reibschlüssig in Kontakt stehenden Farbwalzen (3.2 und 3.4) antreibbar sind.Offset printing device for a rotary printing machine with a plate cylinder and an inking unit with rollers for applying printing ink to a printing plate,
characterized,
that in the inking unit (5) positively rotating, with transfer rollers and inking rollers (4.1 - 4.4) in contact with inking rollers (3.1 - 3.4) can be driven with a peripheral speed that deviates from the peripheral speed of the plate cylinder (2), the inking rollers arranged at a distance from the plate cylinder (2) (3.3 and 3.1) with a greater difference in circumferential speed than the ink rollers (3.2 and 3.4) which are arranged adjacent to the plate cylinder (2) and are frictionally in contact with changeable inking rollers (4.1 - 4.4). Offsetdruckvorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß Farbwalzen (3.1 - 3.4) axial changierend antreibbar sind.Offset printing device according to claim 1,
characterized,
that inking rollers (3.1 - 3.4) can be driven in an axially oscillating manner. Offsetdruckvorrichtung nach Anspruch 1 und 2,
dadurch gekennzeichnet,
daß die maximale Differenz der Umfangsgeschwindigkeit der vom Plattenzylinder (2) entferntest angeordneten Farbwalze (3.3) zur Umfangsgeschwindigkeit des Plattenzylinders 10% beträgt.Offset printing device according to claim 1 and 2,
characterized,
that the maximum difference in the peripheral speed of the ink roller (3.3) most distant from the plate cylinder (2) and the peripheral speed of the plate cylinder is 10%. Offsetdruckvorrichtung nach Anspruch 1 - 3,
dadurch gekennzeichnet,
daß die Farbwalzen (3.1 - 3.4) bezüglich der Umfangsgeschwindigkeit mit einem gestuften Differenzgefälle von wenigstens 2% untereinander antreibbar sind.Offset printing device according to claims 1-3,
characterized,
that the inking rollers (3.1 - 3.4) can be driven with respect to one another with respect to the peripheral speed with a graded differential gradient of at least 2%. Offsetdruckvorrichtung nach Anspruch 1 und 2,
dadurch gekennzeichnet,
daß der Plattenzylinder (2) für den wasserlosen Offsetdruck eine Trocken-Flachdruckplatte trägt.Offset printing device according to claim 1 and 2,
characterized,
that the plate cylinder (2) carries a dry planographic printing plate for waterless offset printing. Offsetdruckvorrichtung nach Anspruch 1 und 2,
dadurch gekennzeichnet,
daß dem Farbwerk (5) in Drehrichtung des Plattenzylinders (2) ein Feuchtwerk (6) vorgeordnet ist und der Plattenzylinder (2) eine für den Naß-Offsetdruck geeignete Druckplatte trägt.Offset printing device according to claim 1 and 2,
characterized,
that a dampening unit (6) is arranged upstream of the inking unit (5) in the direction of rotation of the plate cylinder (2) and the plate cylinder (2) carries a printing plate suitable for wet offset printing.
EP97106619A 1996-06-22 1997-04-22 Offset printing device for rotary press Expired - Lifetime EP0813961B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19625029A DE19625029A1 (en) 1996-06-22 1996-06-22 Offset printing device for rotary printing machines
DE19625029 1996-06-22

Publications (2)

Publication Number Publication Date
EP0813961A1 true EP0813961A1 (en) 1997-12-29
EP0813961B1 EP0813961B1 (en) 1999-06-30

Family

ID=7797722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97106619A Expired - Lifetime EP0813961B1 (en) 1996-06-22 1997-04-22 Offset printing device for rotary press

Country Status (5)

Country Link
US (1) US5823109A (en)
EP (1) EP0813961B1 (en)
JP (1) JPH1067096A (en)
AT (1) ATE181701T1 (en)
DE (2) DE19625029A1 (en)

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DE10000903A1 (en) 1999-02-05 2000-08-10 Heidelberger Druckmasch Ag Operating printing machine involves driving inking mechanism roller at difference speed and different relative speed wrt. form cylinder speed depending on ink mechanism operating states
DE10008488A1 (en) * 1999-03-17 2000-09-21 Heidelberger Druckmasch Ag Damping unit of three rollers has pivot axle, gaps between, spring, support, swivel bearing and frame
EP1147889A3 (en) * 2000-04-14 2006-01-18 Komori Corporation Roller structure in printing press
US6539859B2 (en) 2000-10-17 2003-04-01 Presstek, Inc. Multicolor printing press
JP4199458B2 (en) * 2001-01-19 2008-12-17 ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフト Ink machine
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US7380498B2 (en) * 2006-08-30 2008-06-03 Julius Domotor Offset lithography system
US8850976B2 (en) * 2012-01-11 2014-10-07 James M. Jeter Inker assembly for cylindrical can decorators
DE102014222388A1 (en) 2013-11-04 2015-05-07 Koenig & Bauer Aktiengesellschaft Method and device for coloring a printing plate arranged on a plate cylinder of a printing press

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Also Published As

Publication number Publication date
DE19625029A1 (en) 1998-01-08
ATE181701T1 (en) 1999-07-15
EP0813961B1 (en) 1999-06-30
JPH1067096A (en) 1998-03-10
US5823109A (en) 1998-10-20
DE59700237D1 (en) 1999-08-05

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