EP0545237A1 - Inking unit for a printing machine, especially an offset printing machine for sheets - Google Patents

Inking unit for a printing machine, especially an offset printing machine for sheets Download PDF

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Publication number
EP0545237A1
EP0545237A1 EP92120031A EP92120031A EP0545237A1 EP 0545237 A1 EP0545237 A1 EP 0545237A1 EP 92120031 A EP92120031 A EP 92120031A EP 92120031 A EP92120031 A EP 92120031A EP 0545237 A1 EP0545237 A1 EP 0545237A1
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EP
European Patent Office
Prior art keywords
inking unit
printing
clutch
inking
friction
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Granted
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EP92120031A
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German (de)
French (fr)
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EP0545237B1 (en
Inventor
Stephan Kanzler
Willi Herbert
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication of EP0545237A1 publication Critical patent/EP0545237A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/15—Devices for moving vibrator-rollers

Definitions

  • the invention relates to an inking unit for a printing press, in particular a sheet-fed offset printing press according to the preamble of claim 1.
  • the ink to be printed is fed via an ink fountain interacting with an ink fountain roller and a metering device (e.g. a large number of zone-wide ink metering elements); a siphon roller and a number of inking rollers on the printing plate stretched around a cylinder.
  • a metering device e.g. a large number of zone-wide ink metering elements
  • a siphon roller e.g. a large number of zone-wide ink metering elements
  • the friction rollers in an inking unit of the present invention are axially movable back and forth via their journals in the frame walls of the printing press and are connected to a distribution drive.
  • the friction drive is, for example, a transmission which converts the rotary movement of a gear wheel rigidly connected to the plate cylinder via a crank mechanism whose stroke is adjustable and via further linkages into a corresponding reciprocating movement (EP 0 000 329 A1, DD-PS 113 718).
  • cam mechanisms DE 3 424 721 C2
  • gears with swash plates can also be provided.
  • the stroke as well as the point of use of a lateral rubbing generated in this way is determined by the Printer adjusted according to the subject of the printing plate (ink drop in printing direction).
  • the paper inlet into the machine must first be blocked in the case of a faulty sheet system and then the printing unit must be switched off after the sheet that has last properly entered the machine.
  • the inking rollers stored in the appropriate suspensions are switched off by the plate cylinder and the clocking movement of the lifting roller is interrupted. With such stoppers, the speed of rotation of the printing press can also be automatically reduced. Due to the large number of splitting processes, the lateral rubbing and the lack of ink supply / ink take-off, the ink layer thicknesses are compensated for both in and across the printing direction during printing-free operation.
  • inking unit In the upper part of the inking unit, there is a color balance between ink metering zones with large and small ink layer thicknesses.
  • a large number of sheets e.g. pre-run waste
  • the first printed sheets after a stopper thus have strongly pivoting color density gradients across the format width.
  • Ink flow separation means that with "Printing from” the ink flow in the inking unit is interrupted at some points by separating the corresponding inking unit rollers. The ink layer thickness compensation then takes place only within a reduced number of inking unit rollers.
  • Such a color flow separation is described, for example, in “Technology of Offset Printing", VEB subuchverlag Leipzig 1989, from page 223 described. Color flow separation, however, prevents compensation of the ink layer thicknesses only in the direction of the inking unit.
  • the object of the present invention is thus to improve an inking unit for printing machines in accordance with the preamble of claim 1 in such a way that the number of waste sheets after a stopper can be reduced using simple means.
  • the invention is provided to interrupt the lateral rubbing during a stopper by using a shift clutch assigned to the rubbing drive.
  • this clutch can cause the friction rollers to remain in the reverse position of the traversing movement.
  • the release device that actuates the clutch.
  • it can be linked directly with the "Print on / down" command or with the switch-on and switch-off devices of the inking rollers - mostly pneumatic cylinders.
  • the clutch is assigned to the input-side drive wheel of the friction drive and is designed in such a way that this drive wheel can be disengaged on a shaft in a specific angle of rotation position.
  • a clutch is advantageously achieved by a form-fitting design of the coupling parts to each other.
  • the form-fitting design of the coupling parts is such that the re-engagement takes place only when the coupling parts are at a certain angle of rotation. This ensures in a simple manner that after a stopper lateral rubbing is continued in phase with respect to the printing unit position.
  • Suitable triggering devices are, for example, electromagnetic devices or devices that become effective when hydraulic fluid is applied - hydraulically / pneumatically. The latter devices are expediently actuated by electrically switchable solenoid valves.
  • the clutch can also have a pre-synchronization so that when the triggering device is actuated, the one clutch part is first taken along by the other clutch part by frictional engagement and only then does it engage in a positive and correct phase.
  • the times for actuating the triggering device that is to say engaging or disengaging the clutch, can take place at those times of movement of the friction drive in which the lowest drive torques prevail.
  • the shift clutches outlined above in terms of structure and function, which can be used in the present invention, are known, for example, from DE 2 854 032 A1 and have two toothed disks which are correspondingly toothed to one another, one toothed disk being axially displaceable relative to the other.
  • Switching clutches which can be actuated electromagnetically and have toothed disks are widely used in sheet-fed printing machines and are used, for example, for coupling and uncoupling the sheet feeder (sheet transport) to the drive of the printing press.
  • an inking unit there is no lateral rubbing with a stopper.
  • the ink layer thickness profile located on the inking unit rollers transversely to the printing direction is therefore not rubbed during the stopper.
  • the continuous inking unit rollers and the large number of splitting processes also result in an ink cross flow between the zones with high and those with a lower ink layer thickness, this remains the case Ink layer thickness profile obtained transversely to the printing direction with the friction drive switched off considerably longer than with further rubbing movements.
  • the first friction roller following the lifting roller in particular has large ink layer thickness differences, ie a correspondingly significant ink layer thickness profile, which would degrade in a relatively short time if there were further rubbing movements during a stop.
  • the present invention can be applied to inking units with or without devices for ink flow separation.
  • a printing press inking unit with a plurality of friction drives for a plurality of friction rollers provision can likewise be made for only the topmost friction roller (first friction roller) to be stopped with a stopper.
  • Fig. 2 shows the friction drive of a friction roller 1 of an inking unit, not shown.
  • the friction roller 1 is mounted with its pin 2 axially back and forth in the side walls of the printing machine, not shown here.
  • On a pin 2 is an arm of a via a transmission ring 3 with an elongated cross section, which engages in a corresponding annular groove of the pin 2
  • Angle lever 4 articulated.
  • Angle lever 4 is pivotally mounted on the frame with an axis which is perpendicular to that of the friction roller.
  • a rod 5 is rotatably articulated on a second arm of angle lever 4, for example by means of a fork-shaped end. The other end of the rod 5 is articulated on a crank wheel 6 of the friction drive.
  • the crank wheel 6 has an elongated slot 7 in the radial direction, in which the end of the rod 5 articulated on the crank wheel 6 can be displaced when the locking screw 8 is loosened.
  • the friction drive shown can also drive several friction rollers 1 via special mechanisms.
  • a drive wheel 9 of the friction drive is coaxially assigned to the crank wheel 6 of the friction drive, which meshes, for example, directly with a gearwheel 10 attached to the plate cylinder (not shown here) (FIG. 1). So that not only the stroke but also the time of use for the lateral rubbing is adjustable, the drive wheel 9 can be rotated relative to the crank wheel 6, for example after loosening screws or similar locking means, so that the angular position of the crank wheel 6 can then be changed relative to the angular position of the plate cylinder .
  • crank wheel 6 and the drive wheel 9 are assigned a shaft 11, which is seated via a truncated cone in a bearing arranged in the wall of the side stand 12.
  • Crank wheel 6 is fixedly attached to the free end of shaft 11 (or detachable for the adjustment of the starting point of friction), drive wheel 9 is freely rotatable on shaft 11.
  • the end of shaft 11 assigned to crank wheel 6 is rotatably supported via a housing part 11.2.
  • Housing part 11.2 is firmly connected to the side stand 12.
  • the drive wheel 9 can be locked with respect to the shaft 11 via a clutch 13 arranged on the shaft 11.
  • the clutch 13 consists of a pair of toothed disks 13.1, 13.2, for example a toothed disk 13.1 on the shaft 11 is rotatably connected to the drive wheel 9 and the toothed disk 13.2 is rotatably and axially displaceably (for example via a multi-groove profile 13.3) connected to the shaft 11.
  • the toothed disks 13.1, 13.2 have an L-shaped profile and on the end face such a toothing 13.4 distributed asymmetrically over the circumference, so that mutual engagement is only possible with a single angle of rotation position.
  • the toothed disks 13.1, 13.2 are pressed together, for example, by a compression spring associated with the toothed disk 13.2 (disc springs - not shown -).
  • the triggering device 14 can also be formed from a pressure cylinder (hydraulic / pneumatic) which can be pressurized and which is arranged in the shaft 11, for which purpose holes for the pressure medium supply would also have to be drilled in the shaft 11.
  • a pressure cylinder hydraulic / pneumatic
  • frictional clutches could also be used.
  • the triggering device 14 of a friction clutch (for example hydraulic) is then acted upon at the exact time with the corresponding working medium, so that the separation or closing of the torque flow between the drive wheel 9 and the crank wheel 6 takes place only at a specific angular position of these wheels.
  • the corresponding time switching points for this would be a rotary angle sensor attached to a single-speed shaft of the printing press, in addition to a computer with a stored target angle position can be removed.
  • the triggering device 14 would then be controlled by correspondingly rapidly reacting solenoid valves.
  • the release device 14 and the frictional properties of the clutch parts would then be dimensioned such that there is only negligible slip during the switching operations.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)

Abstract

An inking mechanism for a rotary offset printing machine in which ink is taken from an ink reservoir in metered quantities and distributed by inking rollers to form an ink film which is adapted to be applied to a printing plate mounted on a plate cylinder, at least one of said inking rollers being a distributing roller mounted for rotational and axial reciprocating displacement. A distributing drive is provided which includes a releasable shift coupling operable for interrupting axial movement of the distributing roller upon a printing stoppage even though the printing machine continues to operate. Upon resumption of printing, the shift coupling is actuatable by a releasing mechanism so that the distributing rollers resume axial reciprocating movement. The illustrated shift coupling is shown as a pair of gear plates arranged between two drive wheels, and alternatively, a friction closure coupling can be used, either of which can be electromagnetically, pneumatically, or hydraulically actuated.

Description

Die Erfindung betrifft ein Farbwerk für eine Druckmaschine, insbesondere Bogenoffsetdruckmaschine nach dem Oberbegriff von Anspruch 1.The invention relates to an inking unit for a printing press, in particular a sheet-fed offset printing press according to the preamble of claim 1.

Bei Bogenoffsetdruckmaschinen gelangt die zu verdruckende Farbe über einen mit einer Farbkastenwalze zusammenwirkenden Farbkasten nebst einer Dosiereinrichtung (z.B. Vielzahl zonenbreiter Farbdosierelemente); einer Heberwalze sowie eine Anzahl von Farbwerkswalzen auf die um einen Zylinder gespannte Druckplatte. Eine oder mehrere Farbwerkswalzen - meist die der Heberwalze folgende, die den Farbauftragswalzen zugeordneten sowie eine mittlere Farbwerkswalze - sind als sogenannte Reiberwalzen ausgeführt und führen während des Druckbetriebes axiale Changierbewegungen aus.In sheetfed offset printing presses, the ink to be printed is fed via an ink fountain interacting with an ink fountain roller and a metering device (e.g. a large number of zone-wide ink metering elements); a siphon roller and a number of inking rollers on the printing plate stretched around a cylinder. One or more inking unit rollers - usually the one following the lifting roller, the one assigned to the inking rollers and a medium inking unit roller - are designed as so-called friction rollers and perform axial traversing movements during printing.

Die Reiberwalzen in einem Farbwerk der vorliegenden Erfindung sind über ihre Zapfen in den Gestellwänden der Druckmaschine axial hin- und herbeweglich gelagert und mit einem Verreibungsantrieb verbunden. Bei dem Verreibungsantrieb handelt es sich beispielsweise um ein Getriebe, welches die Drehbewegung eines starr mit dem Plattenzylinder verbundenen Zahnrades über einen in seinem Hub verstellbaren Kurbelmechanismus und über weitere Gestänge in eine entsprechende Hin- und Herbewegung wandelt (EP 0 000 329 A1, DD-PS 113 718). Neben der Ausbildung des Verreibungsantriebes als Kurbelgetriebe können auch Kurvengetriebe (DE 3 424 721 C2) oder Getriebe mit Taumelscheiben vorgesehen sein. Der Hub sowie der Einsatzpunkt einer derartig erzeugten seitlichen Verreibung wird durch den Drucker entsprechend dem Sujet der Druckplatte (Farbabfall in Druckrichtung) angepaßt.The friction rollers in an inking unit of the present invention are axially movable back and forth via their journals in the frame walls of the printing press and are connected to a distribution drive. The friction drive is, for example, a transmission which converts the rotary movement of a gear wheel rigidly connected to the plate cylinder via a crank mechanism whose stroke is adjustable and via further linkages into a corresponding reciprocating movement (EP 0 000 329 A1, DD-PS 113 718). In addition to the design of the friction drive as a crank mechanism, cam mechanisms (DE 3 424 721 C2) or gears with swash plates can also be provided. The stroke as well as the point of use of a lateral rubbing generated in this way is determined by the Printer adjusted according to the subject of the printing plate (ink drop in printing direction).

Bei Bogenoffsetdruckmaschinen muß bei einer fehlerhaften Bogenanlage zunächst der Papiereinlauf in die Maschine gesperrt und dann nach dem zuletzt noch ordnungsgemäß in die Maschine eingelaufene Bogen das Druckwerk abgestellt werden. Gleichzeitig werden die in entsprechenden Aufhängungen gelagerten Farbauftragswalzen vom Plattenzylinder abgestellt und die Taktbewegung der Heberwalze unterbrochen. Bei derartigen Stoppern kann zusätzlich auch die Drehgeschwindigkeit der Druckmaschine automatisch verringert werden. Während des druckfreien Betriebes findet im Farbwerk aufgrund der Vielzahl von Spaltvorgängen, der seitlichen Verreibung und der fehlenden Farbzufuhr/Farbabnahme ein Ausgleich der Farbschichtdicken sowohl in als auch quer zur Druckrichtung statt. Es findet gerade im oberen Teil des Farbwerkes ein Farbausgleich zwischen Farbdosierzonen mit großer und geringer Farbschichtdicke statt. Nach Wiederaufnahme des Druckbetriebes, d.h. nach ordnungsgemäßem Papiereinlauf sowie der entsprechenden Zuschaltung der abgeschalteten Elemente müssen dann erst wieder eine Vielzahl von Bögen (z.B. Vorlaufmakulatur) durch die Druckmaschine laufen, bis sich eine Schichtdickenverteilung auf den Farbwerkswalzen einstellt, wie sie vor dem Stopper herrschte. Die ersten Druckbogen nach einem Stopper weisen somit stark schwenkende Farbdichteverläufe über die Formatbreite auf.In the case of sheetfed offset printing machines, the paper inlet into the machine must first be blocked in the case of a faulty sheet system and then the printing unit must be switched off after the sheet that has last properly entered the machine. At the same time, the inking rollers stored in the appropriate suspensions are switched off by the plate cylinder and the clocking movement of the lifting roller is interrupted. With such stoppers, the speed of rotation of the printing press can also be automatically reduced. Due to the large number of splitting processes, the lateral rubbing and the lack of ink supply / ink take-off, the ink layer thicknesses are compensated for both in and across the printing direction during printing-free operation. In the upper part of the inking unit, there is a color balance between ink metering zones with large and small ink layer thicknesses. After resuming printing, i.e. After the paper has been properly fed in and the elements switched off have been switched on, a large number of sheets (e.g. pre-run waste) have to run through the printing machine again until a layer thickness distribution on the inking unit rollers is achieved, as was the case before the stopper. The first printed sheets after a stopper thus have strongly pivoting color density gradients across the format width.

Um die Anzahl von Makulaturbogen nach einem Stopper zu verringern, sind bereits Farbwerke mit einer sogenannten Farbstromtrennung bekannt geworden. Farbstromtrennung bedeutet hier, daß bei "Druck ab" der Farbfluß im Farbwerk an einigen Stellen unterbrochen wird, indem die entsprechenden Farbwerkswalzen voneinander getrennt werden. Der Farbschichtdickenausgleich erfolgt sodann nur noch innerhalb einer verminderten Anzahl von Farbwerkswalzen. Eine derartige Farbstromtrennung ist beispielsweise in "Technologie des Offsetdruckes", VEB Fachbuchverlag Leipzig 1989, ab Seite 223 beschrieben. Eine Farbstromtrennung verhindert jedoch einen Ausgleich der Farbschichtdicken nur in Richtung des Farbwerkes.In order to reduce the number of waste sheets after a stopper, inking units with a so-called ink flow separation have already become known. Ink flow separation here means that with "Printing from" the ink flow in the inking unit is interrupted at some points by separating the corresponding inking unit rollers. The ink layer thickness compensation then takes place only within a reduced number of inking unit rollers. Such a color flow separation is described, for example, in "Technology of Offset Printing", VEB Fachbuchverlag Leipzig 1989, from page 223 described. Color flow separation, however, prevents compensation of the ink layer thicknesses only in the direction of the inking unit.

Aufgabe der vorliegenden Erfindung ist es somit, ein Farbwerk für Druckmaschinen gemäß dem Oberbegriff von Anspruch 1 derartig zu verbessern, so daß unter Einsatz einfacher Mittel die Zahl von Makulaturbogen nach einem Stopper verringert werden kann.The object of the present invention is thus to improve an inking unit for printing machines in accordance with the preamble of claim 1 in such a way that the number of waste sheets after a stopper can be reduced using simple means.

Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale von Anspruch 1. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen in Verbindung mit der Beschreibung und den Zeichnungen.This object is achieved by the characterizing features of claim 1. Further developments of the invention result from the subclaims in connection with the description and the drawings.

Nach der Erfindung ist vorgesehen, durch Einsatz einer dem Verreibungsantrieb zugeordneten Schaltkupplung die seitliche Verreibung während eines Stoppers zu unterbrechen. Bei Abstellen der Farbauftragswalzen kann durch diese Schaltkupplung bewirkt werden, daß die Reiberwalzen in der Umkehrstellung der Changierbewegung stehen bleiben. Bei Wiederanstellen des Drucks - Farbauftragswalzen an - wird durch phasenrichtiges Einrasten der Schaltkupplung eine Wiederaufnahme der Changierbewegung der Reiberwalzen erreicht. Die die Schaltkupplung betätigende Auslöseeinrichtung. Kann dabei schaltungstechnisch direkt mit dem Kommando "Druck an/ab" bzw. mit den An- und Abstellvorrichtungen der Farbauftragswalzen - meist Pneumatikzylinder - verknüpft sein.According to the invention it is provided to interrupt the lateral rubbing during a stopper by using a shift clutch assigned to the rubbing drive. When the inking rollers are switched off, this clutch can cause the friction rollers to remain in the reverse position of the traversing movement. When the pressure is switched on again - inking rollers on - the shifting movement of the friction rollers is resumed by snapping the clutch in place. The release device that actuates the clutch. In terms of circuitry, it can be linked directly with the "Print on / down" command or with the switch-on and switch-off devices of the inking rollers - mostly pneumatic cylinders.

In einer einfachen Ausgestaltung der Erfindung ist die Schaltkupplung dem eingangsseitigen Antriebsrad des Verreibungsantriebes zugeordnet und derartig ausgebildet, so daß dieses Antriebsrad auf einer Welle in einer bestimmten Drehwinkellage auskuppelbar ist. Eine derartige Schaltkupplung wird zweckmäßigerweise durch eine formschlüssige Ausbildung der Kupplungsteile zueinander erreicht. Die formschlüssige Ausbildung der Kupplungsteile ist dabei dahingehend, so daß das Wiedereinrasten lediglich bei einer bestimmten Drehwinkelstellung der Kupplungsteile untereinander erfolgt. So ist in einfacher Weise gewährleistet, daß nach einem Stopper die seitliche Verreibung phasenrichtig bezogen auf die Druckwerksstellung weitergeführt wird. Als Auslöseeinrichtungen kommen beispielsweise elektromagnetisch oder bei Druckmittelbaufschlagung - hydraulisch/pneumatisch - wirksam werdende Einrichtungen in Frage. Letztere Einrichtungen werden zweckmäßigerweise durch elektrisch schaltbare Magnetventile betätigt.In a simple embodiment of the invention, the clutch is assigned to the input-side drive wheel of the friction drive and is designed in such a way that this drive wheel can be disengaged on a shaft in a specific angle of rotation position. Such a clutch is advantageously achieved by a form-fitting design of the coupling parts to each other. The form-fitting design of the coupling parts is such that the re-engagement takes place only when the coupling parts are at a certain angle of rotation. This ensures in a simple manner that after a stopper lateral rubbing is continued in phase with respect to the printing unit position. Suitable triggering devices are, for example, electromagnetic devices or devices that become effective when hydraulic fluid is applied - hydraulically / pneumatically. The latter devices are expediently actuated by electrically switchable solenoid valves.

Um Kraftspitzen beim Wiedereinrasten der Schaltkupplung, d.h. bei Wiederzuschaltung des Verreibungsantriebes zu vermeiden, kann die Schaltkupplung zusätzlich eine Vorsynchronisierung dahingehend aufweisen, so daß bei Betätigen der Auslöseeinrichtung zunächst eine Mitnahme des einen Kupplungsteils durch das andere Kupplungsteil durch Reibschluß und erst anschließend ein formschlüssiges und phasenrichtiges Einrasten erfolgt. Die Zeitpunkte für das Betätigen der Auslöseeinrichtung, also das Ein- bzw. Ausrücken der Schaltkupplung, kann an denjenigen Bewegungszeitpunkten des Verreibungsantriebes erfolgen, in welchen die geringsten Antriebsmomente herrschen.To force peaks when re-engaging the clutch, i.e. To avoid the reconnection of the friction drive, the clutch can also have a pre-synchronization so that when the triggering device is actuated, the one clutch part is first taken along by the other clutch part by frictional engagement and only then does it engage in a positive and correct phase. The times for actuating the triggering device, that is to say engaging or disengaging the clutch, can take place at those times of movement of the friction drive in which the lowest drive torques prevail.

Die obenstehend in Aufbau und Funktion umrissenen Schaltkupplungen, welche bei der vorliegenden Erfindung zur Anwendung kommen können, sind beispielsweise aus der DE 2 854 032 A1 bekannt und weisen zwei entsprechend zueinander verzahnte Zahnscheiben auf, wobei eine Zahnscheibe axial gegenüber der anderen verschiebbar ist. Elektromagnetisch betätigbare und Zahnscheiben aufweisende Schaltkupplungen finden in Bogendruckmaschinen weite Verbreitung und dienen beispielsweise dem An- und Abkoppeln des Bogenanlegers (Bogentransport) an den Antrieb der Druckmaschine.The shift clutches outlined above in terms of structure and function, which can be used in the present invention, are known, for example, from DE 2 854 032 A1 and have two toothed disks which are correspondingly toothed to one another, one toothed disk being axially displaceable relative to the other. Switching clutches which can be actuated electromagnetically and have toothed disks are widely used in sheet-fed printing machines and are used, for example, for coupling and uncoupling the sheet feeder (sheet transport) to the drive of the printing press.

Bei einem Farbwerk gemäß der Erfindung findet bei einem Stopper keine seitliche Verreibung statt. Das auf den Farbwerkswalzen befindliche Farbschichtdickenprofil quer zur Druckrichtung wird somit während des Stoppers nicht verrieben. Zwar findet durch die weiterlaufenden Farbwerkswalzen und die Vielzahl von Spaltprozessen ebenfalls ein Farbquerfluß zwischen den Zonen mit hoher und denen mit geringerer Farbschichtdicke statt, jedoch bleibt das Farbschichtdickenprofil quer zur Druckrichtung bei abgeschaltetem Verreibungsantrieb wesentlich länger als bei weitergehenden Verreibungsbewegungen erhalten. Gerade die der Heberwalze folgende erste Reiberwalze weist große Farbschichtdickendifferenzen, d.h. ein entsprechend signifikantes Farbschichtdickenprofil auf, welches sich bei weitergehenden Reiberbewegungen während eines Stoppers in relativ kurzer Zeit abbauen würde. Ein Farbwerk mit einer sogenannten Farbstromtrennung vermag hier keine Abhilfe zu schaffen, da wohl das Farbschichtdickengefälle in Farbwerksrichtung annähernd "eingefroren" bleibt, durch die weitergehenden Reiberbewegungen gerade im oberen Teil des Farbwerkes der Farbschichtdickenverlauf quer zur Druckrichtung aber relativ rasch ausgeglichen wird.In an inking unit according to the invention, there is no lateral rubbing with a stopper. The ink layer thickness profile located on the inking unit rollers transversely to the printing direction is therefore not rubbed during the stopper. Although the continuous inking unit rollers and the large number of splitting processes also result in an ink cross flow between the zones with high and those with a lower ink layer thickness, this remains the case Ink layer thickness profile obtained transversely to the printing direction with the friction drive switched off considerably longer than with further rubbing movements. The first friction roller following the lifting roller in particular has large ink layer thickness differences, ie a correspondingly significant ink layer thickness profile, which would degrade in a relatively short time if there were further rubbing movements during a stop. An inking unit with a so-called ink flow separation cannot remedy this, since the ink layer thickness gradient in the inking unit direction remains approximately "frozen", but due to the further rubbing movements, especially in the upper part of the inking unit, the ink layer thickness profile transverse to the printing direction is compensated for relatively quickly.

Die vorliegende Erfindung kann bei Farbwerken mit oder ohne Einrichtungen für die Farbstromtrennung angewendet werden. Bei einem Druckmaschinenfarbwerk mit mehreren Verreibungsantrieben für mehrere Reiberwalzen kann ebenfalls vorgesehen sein, bei einem Stopper nur die oberste Reiberwalze (erster Reiber) abzustellen.The present invention can be applied to inking units with or without devices for ink flow separation. In the case of a printing press inking unit with a plurality of friction drives for a plurality of friction rollers, provision can likewise be made for only the topmost friction roller (first friction roller) to be stopped with a stopper.

Des weiteren erfolgt die Erläuterung eines Ausführungsbeispiels der Erfindung anhand der nachfolgenden Zeichnungen.Furthermore, an embodiment of the invention is explained with reference to the following drawings.

Es zeigt:

Fig. 1
eine dem Verreibungsantrieb zugeordnete Schaltkupplung nach der Erfindung,
Fig. 2
ein Beispiel eines Verreibungsantriebs gemäß der Erfindung.
It shows:
Fig. 1
a clutch according to the invention assigned to the friction drive,
Fig. 2
an example of a friction drive according to the invention.

Fig. 2 zeigt den Verreibungsantrieb einer Reiberwalze 1 eines nicht weiter dargestellten Farbwerkes. Reiberwalze 1 ist mit ihren Zapfen 2 in den hier nicht gezeigten Seitenwänden der Druckmaschine axial hin- und herbeweglich gelagert. An einem Zapfen 2 ist über einen Übertragungsring 3 mit länglichem Querschnitt, der in einer entsprechenden Ringnut des Zapfens 2 eingreif, ein Arm eines Winkelhebels 4 angelenkt. Winkelhebel 4 ist mit einer Achse, welche senkrecht zu der der Reiberwalze steht, gestellfest schwenkbar gelagert. An einem zweiten Arm von Winkelhebel 4 ist beispielsweise mittels eines gabelförmigen Endes eine Stange 5 drehbar angelenkt. Das andere Ende der Stange 5 ist an einem Kurbelrad 6 des Verreibungsantriebes angelenkt. Um den Hub der Reibwalze 1 einstellen zu können, weist das Kurbelrad 6 einen Langschlitz 7 in radialer Richtung auf, in dem das am Kurbelrad 6 angelenkte Ende der Stange 5 bei gelöster Arretierschraube 8 verschiebbar ist. Der dargestellte Verreibungsantrieb kann über spezielle Mechanismen auch mehrere Reiberwalzen 1 antreiben.Fig. 2 shows the friction drive of a friction roller 1 of an inking unit, not shown. The friction roller 1 is mounted with its pin 2 axially back and forth in the side walls of the printing machine, not shown here. On a pin 2 is an arm of a via a transmission ring 3 with an elongated cross section, which engages in a corresponding annular groove of the pin 2 Angle lever 4 articulated. Angle lever 4 is pivotally mounted on the frame with an axis which is perpendicular to that of the friction roller. A rod 5 is rotatably articulated on a second arm of angle lever 4, for example by means of a fork-shaped end. The other end of the rod 5 is articulated on a crank wheel 6 of the friction drive. In order to be able to adjust the stroke of the friction roller 1, the crank wheel 6 has an elongated slot 7 in the radial direction, in which the end of the rod 5 articulated on the crank wheel 6 can be displaced when the locking screw 8 is loosened. The friction drive shown can also drive several friction rollers 1 via special mechanisms.

Dem Kurbelrad 6 des Verreibungsantriebes ist koaxial ein Antriebsrad 9 des Verreibungsantriebes zugeordnet, welches beispielsweise direkt mit einem am - hier nicht dargestellten - Plattenzylinder angebrachten Zahnrad 10 kämmt (Fig. 1). Damit nicht nur der Hub sondern auch der Einsatzzeitpunkt für die seitliche Verreibung einstellbar ist, kann das Antriebsrad 9 gegenüber dem Kurbelrad 6 beispielsweise nach Lösen von Schrauben oder ähnlichen Arretiermitteln verdrehbar sein, so daß die Drehwinkellage des Kurbelrades 6 dann gegenüber der Drehwinkellage des Plattenzylinders veränderbar ist.A drive wheel 9 of the friction drive is coaxially assigned to the crank wheel 6 of the friction drive, which meshes, for example, directly with a gearwheel 10 attached to the plate cylinder (not shown here) (FIG. 1). So that not only the stroke but also the time of use for the lateral rubbing is adjustable, the drive wheel 9 can be rotated relative to the crank wheel 6, for example after loosening screws or similar locking means, so that the angular position of the crank wheel 6 can then be changed relative to the angular position of the plate cylinder .

Gemäß Fig. 1 ist dem Kurbelrad 6 und dem Antriebsrad 9 eine Welle 11 zugeordnet, die über einen Zapfenstumpf in einem in der Wand des Seitenständers 12 angeordneten Lager sitzt. Kurbelrad 6 ist fest an dem freien Ende von Welle 11 angebracht (bzw. lösbar für die Verstellung des Verreibungseinsatzpunktes), Antriebsrad 9 sitzt frei drehbar auf der Welle 11. Über ein Gehäuseteil 11.2 ist das dem Kurbelrad 6 zugeordnete Ende von Welle 11 drehbar abgestützt. Gehäuseteil 11.2 ist fest mit dem Seitenständer 12 verbunden. Über eine auf der Welle 11 angeordnete Schaltkupplung 13 ist das Antriebsrad 9 bezüglich der Welle 11 arretierbar.1, the crank wheel 6 and the drive wheel 9 are assigned a shaft 11, which is seated via a truncated cone in a bearing arranged in the wall of the side stand 12. Crank wheel 6 is fixedly attached to the free end of shaft 11 (or detachable for the adjustment of the starting point of friction), drive wheel 9 is freely rotatable on shaft 11. The end of shaft 11 assigned to crank wheel 6 is rotatably supported via a housing part 11.2. Housing part 11.2 is firmly connected to the side stand 12. The drive wheel 9 can be locked with respect to the shaft 11 via a clutch 13 arranged on the shaft 11.

Die Schaltkupplung 13 besteht aus einem Paar Zahnscheiben 13.1, 13.2, wobei beispielsweise eine Zahnscheibe 13.1 auf der Welle 11 drehfest mit dem Antriebsrad 9 verbunden ist und die Zahnscheibe 13.2 drehfest und axialverschiebbar (z.B. über ein Vielnutprofil 13.3) mit der Welle 11 verbunden ist.The clutch 13 consists of a pair of toothed disks 13.1, 13.2, for example a toothed disk 13.1 on the shaft 11 is rotatably connected to the drive wheel 9 and the toothed disk 13.2 is rotatably and axially displaceably (for example via a multi-groove profile 13.3) connected to the shaft 11.

Die Zahnscheiben 13.1, 13.2 weisen ein L-förmiges Profil und stirnseitig eine derartig asymmetrisch über den Umfang verteilte Verzahnung 13.4 auf, so daß ein gegenseitiges Einrasten nur bei einer einzigen Drehwinkelstellung möglich ist. Die Zahnscheiben 13.1, 13.2 werden beispielsweise durch eine der Zahnscheibe 13.2 zugeordnete Druckfeder (Tellerfedern - nicht dargestellt -) zusammengedrückt.The toothed disks 13.1, 13.2 have an L-shaped profile and on the end face such a toothing 13.4 distributed asymmetrically over the circumference, so that mutual engagement is only possible with a single angle of rotation position. The toothed disks 13.1, 13.2 are pressed together, for example, by a compression spring associated with the toothed disk 13.2 (disc springs - not shown -).

Den Zahnscheiben 13.1, 13.2 ist eine Auslöseeinrichtung 14 in Form einer am Gehäuseteil 11.2 angebrachten, koaxial zur Welle orientierten, ein Magnetfeld erzeugenden Spule 14.1 angeordnet. Diese wird zum Entkoppeln von Antriebsrad 9 und Welle 11 von einem Strom durchflossen. Das von der Spule 14.1 erzeugte Magnetfeld versucht dann den zwischen Gehäuseteil 11.2 und Zahnscheibe 13.2 gebildeten Luftspalt 14.2 gegen die Federkraft zu verkleinern (Auskuppeln).A triggering device 14 in the form of a coil 14.1 which is attached to the housing part 11.2 and is oriented coaxially to the shaft and generates a magnetic field is arranged on the toothed disks 13.1, 13.2. A current flows through this to decouple the drive wheel 9 and shaft 11. The magnetic field generated by the coil 14.1 then tries to reduce the air gap 14.2 formed between the housing part 11.2 and the toothed disk 13.2 against the spring force (disengagement).

Anstelle einer Spule 14.1 und Luftspalt 14.2 kann die Auslöseeinrichtung 14 auch aus einem druckmittelbeaufschlagbaren (hydraulisch/pneumatisch) Arbeitszylinder gebildet sein, der in der Welle 11 angeordnet ist, wozu Bohrungen zur Druckmittelversorgung ebenfalls in der Welle 11 anzubringen wären.Instead of a coil 14.1 and air gap 14.2, the triggering device 14 can also be formed from a pressure cylinder (hydraulic / pneumatic) which can be pressurized and which is arranged in the shaft 11, for which purpose holes for the pressure medium supply would also have to be drilled in the shaft 11.

Anstelle der zu Fig. 1 beschriebenen Ausführung der Schaltkupplung 13 nebst der Auslöseeinrichtung 14 könnten auch reibschlüssige Kupplungen zur Anwendung kommen. Die Auslöseeinrichtung 14 einer reibschlüssigen Kupplung (z.B. hydraulisch) wird dann genau zu dem Zeitpunkt mit dem entsprechenden Arbeitsmittel beaufschlagt, so daß das Trennen bzw. Schließen des Drehmomentflusses zwischen Antriebsrad 9 und Kurbelrad 6 lediglich zu einer bestimmten Winkelstellung dieser Räder zueinander erfolgt. Die entsprechenden Zeitschaltpunkte dafür wären einem an einer Eintourenwelle der Druckmaschine angebrachten Drehwinkelgeber nebst einem Rechner mit einer gespeicherten Sollwinkelstellung entnehmbar. Die Auslöseeinrichtung 14 würde dann durch entsprechend schnell reagierende Magnetventile gesteuert. Die Auslöseeinrichtung 14 sowie die Reibeigenschaften der Kupplungsteile wären dann derartig zu bemessen, daß sich nur vernachlässigbarer Schlupf während der Schaltvorgänge ergibt.Instead of the embodiment of the clutch 13 described in FIG. 1 in addition to the release device 14, frictional clutches could also be used. The triggering device 14 of a friction clutch (for example hydraulic) is then acted upon at the exact time with the corresponding working medium, so that the separation or closing of the torque flow between the drive wheel 9 and the crank wheel 6 takes place only at a specific angular position of these wheels. The corresponding time switching points for this would be a rotary angle sensor attached to a single-speed shaft of the printing press, in addition to a computer with a stored target angle position can be removed. The triggering device 14 would then be controlled by correspondingly rapidly reacting solenoid valves. The release device 14 and the frictional properties of the clutch parts would then be dimensioned such that there is only negligible slip during the switching operations.

BezugszeichenlisteReference symbol list

11
ReiberwalzeGrater roller
22nd
ZapfenCones
33rd
ÜbertragungsringTransmission ring
44th
WinkelhebelAngle lever
55
Stangepole
66
KurbelradCrank wheel
77
LangschlitzLong slot
88th
ArretierschraubeLocking screw
99
Antriebsraddrive wheel
1010th
Zahnradgear
1111
Wellewave
11.111.1
Lagerwarehouse
11.211.2
GehäuseteilHousing part
1212
SeitenständerSide stand
1313
SchaltkupplungClutch
13.113.1
ZahnscheibeTooth lock washer
13.213.2
ZahnscheibeTooth lock washer
13.313.3
VielnutprofilMulti-groove profile
13.413.4
VerzahnungGearing
1414
AuslöseeinrichtungRelease device
14.114.1
SpuleKitchen sink
14.214.2
LuftspaltAir gap

Claims (8)

Farbwerk für eine Druckmaschine, insbesondere Bogenoffsetdruckmaschine, bei welchem die auf einer Farbkastenwalze quer zur Druckrichtung in unterschiedlicher Farbschichtdicke zuführbare Farbe über eine Anzahl von Farbwerkswalzen und Farbauftragswalzen auf eine Druckform aufgebracht wird und wenigstens eine Farbwerkswalze als Reiberwalze ausgebildet ist, die über einen durch die Drehbewegung des Druckwerks angetriebenen Verreibungsantrieb zu periodischen Axialbewegungen angetrieben wird,
dadurch gekennzeichnet,
daß dem Verreibungsantrieb (4 - 9; 11) eine durch eine Auslöseeinrichtung (14) betätigbare Schaltkupplung (13) derartig zugeordnet ist, so daß die periodischen Axialbewegungen der Reiberwalze (1) bei Unterbrechung des Druckbetriebes und weiterlaufendem Druckwerk stillsetzbar sind.Inking unit for a printing machine, in particular sheetfed offset printing machine, in which the ink that can be fed on an ink fountain roller across the printing direction in different ink layer thicknesses is applied to a printing form via a number of inking unit rollers and inking rollers and at least one inking unit roller is designed as a friction roller that is rotated by the rotary movement of the Printing unit driven friction drive is driven to periodic axial movements
characterized,
that the friction drive (4-9; 11) is assigned a clutch (13) which can be actuated by a trigger device (14) in such a way that the periodic axial movements of the friction roller (1) can be stopped when printing operation is interrupted and the printing unit continues to run. Farbwerk nach Anspruch 1,
dadurch gekennzeichnet,
daß die Auslöseeinrichtung (14) schaltungstechnisch mit den das An- bzw. Abstellen der Farbauftragwalzen bewirkenden Organen verbunden ist.Inking unit according to claim 1,
characterized,
that the triggering device (14) is connected in terms of circuitry to the organs causing the switching on and off of the inking rollers. Farbwerk nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Schaltkupplung (13) als eine formschlüssige Kupplung zwischen einem Kurbelrad (6) und dem Antriebsrad (9) des Verreibungsantriebs ausgebildet ist, wobei die entsprechenden Kupplungsteile derartig gestaltet sind, so daß ein Koppeln von Kurbelrad (6) mit Antriebsrad (9) nur bei einer bestimmten Winkellage der Räder (6, 9) zueinander möglich ist.Inking unit according to claim 1 or 2,
characterized,
that the clutch (13) is designed as a positive coupling between a crank wheel (6) and the drive wheel (9) of the friction drive, the corresponding coupling parts being designed such that coupling of the crank wheel (6) with the drive wheel (9) only at a certain angular position of the wheels (6, 9) to each other is possible. Farbwerk nach Anspruch 3,
dadurch gekennzeichnet,
daß die Schaltkupplung (13) durch zwei jeweils drehfest mit Kurbelrad (6) bzw. Antriebsrad (9) verbundenen, auf einer gemeinsamen Welle (11) sitzenden Zahnscheiben (13.1, 13.2) gebildet ist, wobei eine Zahnscheibe (13.2) axial verschiebbar angeordnet ist und die stirnseitig eine asymmetrisch über den Umfang verteilte Verzahnung aufweisen und über eine eine axiale Verschiebung bewirkende Auslöseeinrichtung (14) betätigbar sind.Inking unit according to claim 3,
characterized,
that the clutch (13) is formed by two toothed disks (13.1, 13.2), each of which is non-rotatably connected to the crank wheel (6) or drive wheel (9) and is seated on a common shaft (11), a toothed disk (13.2) being arranged axially displaceably and which have a toothing distributed asymmetrically over the circumference on the end face and can be actuated by a triggering device (14) which causes an axial displacement. Farbwerk nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Schaltkupplung (13) als reibschlüssige Kupplung zwischen Kurbelrad (6) und Antriebsrad (9) ausgebildet ist, die über die Auslöseeinrichtung (14) derartig betätigbar ist, so daß sich ein Koppeln der Räder (6, 9) nur bei einer bestimmten Drehwinkellage zueinander ermöglicht.Inking unit according to claim 1 or 2,
characterized,
that the clutch (13) is designed as a friction clutch between the crank wheel (6) and the drive wheel (9), which can be actuated via the release device (14), so that there is a coupling of the wheels (6, 9) only at a certain angular position to each other. Farbwerk nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Schaltkupplung (13) als eine formschlüssige Kupplung zwischen Kurbelrad (6) und Antriebsrad (9) ausgebildet ist, so daß ein Koppeln zwischen den Rädern (6, 9) nur bei einer bestimmten Drehwinkellage zueinander möglichst ist und der formschlüssigen Kupplung zusätzlich eine durch Reibschluß wirkende Vorsynchronisierung zugeordnet ist.Inking unit according to claim 1 or 2,
characterized,
that the clutch (13) is designed as a positive coupling between the crank wheel (6) and drive wheel (9), so that coupling between the wheels (6, 9) is possible with each other only at a certain angle of rotation position and the positive coupling additionally a Frictional pre-synchronization is assigned. Farbwerk nach Anspruch 3, 4, 5 oder 6,
dadurch gekennzeichnet,
daß die Auslöseeinrichtung (14) als eine elektromagnetisch betätigbare Einrichtung in Form einer Spule (14.1) ausgebildet ist.Inking unit according to claim 3, 4, 5 or 6,
characterized,
that the triggering device (14) is designed as an electromagnetically actuated device in the form of a coil (14.1). Farbwerk nach Anspruch 3, 4, 5 oder 6,
dadurch gekennzeichnet,
daß die Auslöseeinrichtung (14) als eine bei Druckmittelbeaufschlagung (hydraulisch/pneumatisch) wirksam werdende Einrichtung in Form eines Arbeitszylinders ausgebildet ist.Inking unit according to claim 3, 4, 5 or 6,
characterized,
that the triggering device (14) is designed as a device in the form of a working cylinder that becomes effective when pressure medium (hydraulic / pneumatic) is applied.
EP92120031A 1991-12-05 1992-11-25 Inking unit for a printing machine, especially an offset printing machine for sheets Expired - Lifetime EP0545237B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4140048A DE4140048C2 (en) 1991-12-05 1991-12-05 Inking unit of a printing press, in particular sheet-fed offset printing press
DE4140048 1991-12-05

Publications (2)

Publication Number Publication Date
EP0545237A1 true EP0545237A1 (en) 1993-06-09
EP0545237B1 EP0545237B1 (en) 1994-09-28

Family

ID=6446293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92120031A Expired - Lifetime EP0545237B1 (en) 1991-12-05 1992-11-25 Inking unit for a printing machine, especially an offset printing machine for sheets

Country Status (5)

Country Link
US (1) US5249523A (en)
EP (1) EP0545237B1 (en)
JP (1) JPH07102698B2 (en)
AT (1) ATE112213T1 (en)
DE (2) DE4140048C2 (en)

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US5701817A (en) * 1994-10-08 1997-12-30 Heidelberger Druckmaschinen Aktiengesellschaft Apparatus for adjusting the movement of a roller in a printing press
EP0924072A1 (en) * 1997-12-17 1999-06-23 Heidelberger Druckmaschinen Aktiengesellschaft Method for operating a rotary printing machine and device in a rotary printing machine
EP1125739A2 (en) * 2000-02-18 2001-08-22 Mitsubishi Heavy Industries, Ltd. Operating a sheet-fed offset press having an oscillating roller
DE102004048149A1 (en) * 2004-10-02 2006-04-06 Koenig & Bauer Ag Inking attachment operation method for rotary printing press involves operating color distributors when contact between color roller and printing section is obtained

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DE4445964B4 (en) * 1994-12-22 2005-12-01 Heidelberger Druckmaschinen Ag Inking unit of a printing press
DE19505625C2 (en) * 1995-02-18 1996-12-12 Roland Man Druckmasch Forced drive for an inking roller in a printing press
DE19821652A1 (en) * 1997-10-02 1999-04-08 Heidelberger Druckmasch Ag Ink mechanism for printers
DE10003026B4 (en) * 2000-01-25 2004-03-25 Koenig & Bauer Ag Drive for a distribution roller
EP2509797B1 (en) * 2009-12-07 2014-10-01 Felix Böttcher GmbH & Co. KG Distributor rollers

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US5701817A (en) * 1994-10-08 1997-12-30 Heidelberger Druckmaschinen Aktiengesellschaft Apparatus for adjusting the movement of a roller in a printing press
EP0924072A1 (en) * 1997-12-17 1999-06-23 Heidelberger Druckmaschinen Aktiengesellschaft Method for operating a rotary printing machine and device in a rotary printing machine
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EP1125739A3 (en) * 2000-02-18 2001-10-04 Mitsubishi Heavy Industries, Ltd. Operating a sheet-fed offset press having an oscillating roller
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DE102004048149A1 (en) * 2004-10-02 2006-04-06 Koenig & Bauer Ag Inking attachment operation method for rotary printing press involves operating color distributors when contact between color roller and printing section is obtained
DE102004048149B4 (en) * 2004-10-02 2015-10-15 Koenig & Bauer Ag Method for operating an inking unit of a rotary printing machine

Also Published As

Publication number Publication date
ATE112213T1 (en) 1994-10-15
US5249523A (en) 1993-10-05
DE4140048A1 (en) 1993-06-09
EP0545237B1 (en) 1994-09-28
JPH07102698B2 (en) 1995-11-08
DE59200568D1 (en) 1994-11-03
JPH05254100A (en) 1993-10-05
DE4140048C2 (en) 1995-09-21

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