EP2520431A2 - Method for cleaning colour decks in offset printers and offset printer - Google Patents

Method for cleaning colour decks in offset printers and offset printer Download PDF

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Publication number
EP2520431A2
EP2520431A2 EP20120162941 EP12162941A EP2520431A2 EP 2520431 A2 EP2520431 A2 EP 2520431A2 EP 20120162941 EP20120162941 EP 20120162941 EP 12162941 A EP12162941 A EP 12162941A EP 2520431 A2 EP2520431 A2 EP 2520431A2
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EP
European Patent Office
Prior art keywords
inking
ink
printing
units
emptying
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Granted
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EP20120162941
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German (de)
French (fr)
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EP2520431B1 (en
EP2520431A3 (en
Inventor
Ehrhardt Stephan
Maier Bernd
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication of EP2520431A2 publication Critical patent/EP2520431A2/en
Publication of EP2520431A3 publication Critical patent/EP2520431A3/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
    • B41F35/04—Cleaning arrangements or devices for inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety 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
    • B41P2235/21—Scrapers, e.g. absorbent pads
    • 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
    • B41P2235/26—Spraying devices

Definitions

  • Offset printing machines be it so-called web presses, in which a paper web is printed, or sheetfed presses in which already cut sheets are transported through the machine and printed on one or both sides color, have several printing units, each printing unit in turn has an inking and the respective inking unit again a paint tray extending across the width of the print format.
  • the so-called ink ductor which removes the ink to be printed from the ink tray and further promotes to the other rollers of the inking unit.
  • the liquid anilox used for this purpose is taken up in a chambered doctor blade, which rests against a so-called anilox roller, which occupies a similar function as the ductor in this case.
  • Washing devices for offset printing machines are described, for example, in the following documents: US 8056476 B2 . US8033219 B2 . US 7677174 B2 . US 7533609 B2 and US 7373882 B2 ,
  • a job change is therefore not only connected with downtime for the printing press because of the above-mentioned cleaning processes, but the cleaning processes contribute significantly to the downtimes.
  • EP 0654350 B 1 is proposed to make the wash sequence programs variable and to make, for example, the time course, operating parameters of the printing press or the degree of contamination.
  • the EP 0654350 B1 to run the wash cycle programs fully automatically to completely remove the influence of an operator.
  • This also includes reinserting a fresh film and re-filling new paint in the paint tray either also manually with the paint spatula or by inserting a corresponding new ink cartridge in an automatic refill system that moves back and forth over the ink fountain and this filled and optionally replenished.
  • the filling of the old paint and the re-filling of the new paint naturally occurs when only a single printer operates the machine, sequentially.
  • the invention has therefore set itself the goal, in such a case d. H. in a method for cleaning inking units in offset printing machines, in which the ink pans of the individual inking units of the printing units are sequentially emptied one after the other and then refilled with ink to reduce set-up times when changing jobs.
  • This object is achieved in that immediately after the emptying of the first ink tray of the washing process for the associated inking is started before the other ink pans are emptied, and each time after emptying another of the other ink pans the washing process for the respective other inking is started and that the refilling of the first ink tray is started while still washing operations for one or more of the further inking units are underway.
  • the cleaning program for the blanket or the printing cylinder of the associated printing unit can already be started while the emptying of the first ink tray is started.
  • All of the inking units of the printing press can also be driven together via the main drive of the printing press and be in motion while the printer is working on emptying the ink pans. A separate coupling and uncoupling of individual inking units especially for the cleaning process is not required.
  • the end of the emptying of the ink pan is either automatically detected and used to start the wash program for the associated inking, or if the respective inking unit or printing unit within reach of the printer, which emptied there the paint tray , a switch or button is attached, with which this can then start the washing sequence without having to go to the control panel of the printing press.
  • this can be done by a sensor that detects the folding of the ink tray of the ink fountain roller, so the movement that is performed by the printer at the end of the emptying.
  • Such a sensor, pushbutton or switch not only serves the convenience of the printer, but reduces the set-up time, as this does not have to interrupt his work to start the washing sequence on the control panel, but immediately on the next printing unit with the emptying of the ink tray can begin.
  • the ink pans, inking units or printing units of the printing machine can be associated with display devices which are connected to the controller for the inking unit washing and the printer to indicate the order of emptying of the ink fountain by corresponding optical signals.
  • Each of the four printing units 7a-d has an impression cylinder 4a, a blanket cylinder 5a and a printing form cylinder 6a, on which the respective printing plate is mounted.
  • the printing plates are dyed by inking units 8a-d, one of which will be described in more detail below.
  • the functions in the printing units 7a-d, the feeder 2 and the feeder 9 are operated, controlled and monitored by a machine control 56.
  • FIG. 2 shown inking unit has a paint tray 13, a ductor roller 14, four inking rollers 28, 29, 30 and 31, with which the printing plate is inked on the cylinder 6a, and a number of other rollers 15 to 27, of which the color of the ductor 14 removed, distributed and triturated and then fed to the applicator rolls.
  • 15 of the clockwise between the ductor 14 and the roller 21 oscillating color lifter is designated.
  • the rollers 21, 22, 23 and 24 are traversing distributor rollers, the drivers 23 and 24 being cooled.
  • the ductor 15 and the rollers 16, 17, 18, 19, 20, as well as the four inking rollers 28 to 31 are provided with a rubber jacket, while the bridge roller 32, between the Dampening roller 37 and the first inking roller 28 is arranged, as well as the rollers 27, 26 and 25 are steel rollers.
  • a trough 42 with a washing blade 41 is provided, which can be placed against the roller 24. Furthermore, spray pipes 43 and 44 are provided, of which can be sprayed in the course of issued by a control commands to two valves 53 and 54 and wash liquids in the inking unit.
  • the ink tray 13 is symbolized by the arrow 51 pivotable about an axis 50 and can be moved away so after their emptying of ductor 14 and locked to a stop 52.
  • a limit switch 57 is attached, recognized by the completed Abstelliolo the paint tray and is signaled to the part 55 of the controller 56, which is responsible for the washing operations.
  • the printer has hitherto proceeded according to the prior art as follows ( FIG. 3 : above): It is assumed that three of the four inking units must be cleaned, while in the fourth inking unit z. B. the color black can remain.
  • the washing of the blanket and possibly printing cylinders starts in all printing units that were used at the end of the order. This is symbolized by the bar labeled GTW.
  • the printer begins to paint the ink from the ink tray of the first printing unit 1. The time required for this is indicated by the bar labeled DW 1. He then unfolds the ink tray from the ductor and goes to the next printing unit, where he continues with the emptying there. This is symbolized by the bar labeled DW 2. Thereafter, the same process for the printing unit 3 (DW 3).
  • the printer goes to the control panel and starts the washing operations for the inking units in the printing units 1 to 3, which then all run at the same time. This is symbolized by the three superimposed bars, which are each labeled FW 1 to FW 3.
  • the printer refills ink in the printing units 1 to 3 (bars DW 1 to DW 3). It takes about 3 minutes for the inking unit wash FW to wait for the printer before it can start refilling the ink pans.
  • the printer can immediately start refilling the first printing unit DW 1 and then also the remaining trays for the inking units in the printing units 2 and 3 as soon as the washing operation is completed in the respective inking unit ,
  • the set-up time required for cleaning the inking units of previously 12 minutes shorten as shown in the diagram after FIG. 3 below given to about 9 minutes, although the washing operations for the inking units in the printing units 1 to 3 are not performed in parallel, but partly overlapping sequentially, basically by a shortened waiting time for the printer.

Abstract

The method involves refilling ink fountains with anilox ink, and starting a washing operation for an anilox inking unit i.e. cartridge, after emptying an associated ink fountain and before emptying another ink fountain. A washing operation for the inking unit is started after emptying the respective ink fountains, and a refilling process of the former ink fountain is started while washing operations for inking units are in running condition. The refilling process of another ink fountain is started after the completion of a washing program for the inking unit. An independent claim is also included for an offset printing machine.

Description

Offsetdruckmaschinen, seien es nun sogenannte Rollendruckmaschinen, bei denen eine Papierbahn bedruckt wird, oder Bogendruckmaschinen, bei denen bereits geschnittene Bögen durch die Maschine befördert und einseitig oder beidseitig farbig bedruckt werden, besitzen mehrere Druckwerke, wobei jedes Druckwerk seinerseits ein Farbwerk besitzt und das jeweilige Farbwerk wiederum eine sich über die Breite des Druckformats erstreckende Farbwanne. Die wiederum liegt an dem sogenannten Farbduktor an, der die zu verdruckende Farbe aus der Farbwanne entnimmt und an die weiteren Walzen des Farbwerks weiterfördert. Soweit es sich um Offsetdruckmaschinen mit sogenannten Kurzfarbwerken handelt, ist die dafür verwendete flüssigere Aniloxfarbe in einem Kammerrakel aufgenommen, das an einer sogenannten Rasterwalze anliegt, die in diesem Falle eine ähnliche Funktion wie der Duktor einnimmt.Offset printing machines, be it so-called web presses, in which a paper web is printed, or sheetfed presses in which already cut sheets are transported through the machine and printed on one or both sides color, have several printing units, each printing unit in turn has an inking and the respective inking unit again a paint tray extending across the width of the print format. Which in turn is due to the so-called ink ductor, which removes the ink to be printed from the ink tray and further promotes to the other rollers of the inking unit. As far as it is offset printing machines with so-called short inking, the liquid anilox used for this purpose is taken up in a chambered doctor blade, which rests against a so-called anilox roller, which occupies a similar function as the ductor in this case.

Zwischen verschiedenen Druckaufträgen kann es erforderlich sein, die Druckfarbe in dem jeweiligen Farbwerk bzw. der Farbwanne zu wechseln, entweder weil der nächste Auftrag mit einem anderen Farbensatz gedruckt wird, oder weil die Farbe in ihren Eigenschaften z. B. Verschmutzungsgrad etc. nicht mehr den Anforderungen entspricht. In der Regel werden daher beim Auftragswechsel nicht nur die Farbwannen entleert, sondern das gesamte Farbwerk gewaschen sowie ebenfalls das Gummituch auf dem Gummituchzylinder sowie der Gegendruckzylinder gewaschen, also all die Teile, die beim Drucken Farbe angenommen haben.Between different print jobs, it may be necessary to change the ink in the respective inking unit or the ink tray, either because the next job is printed with a different set of colors, or because the color in their properties z. B. Pollution degree etc. no longer meets the requirements. In general, therefore, not only the ink pans are emptied when changing jobs, but washed the entire inking and also washed the blanket on the blanket cylinder and the impression cylinder, so all the parts that have taken on printing color.

Wascheinrichtungen für Offsetdruckmaschinen sind beispielsweise in folgenden Schriften beschrieben: US 8056476 B2 , US 8033219 B2 , US 7677174 B2 , US 7533609 B2 und US 7373882 B2 .Washing devices for offset printing machines are described, for example, in the following documents: US 8056476 B2 . US8033219 B2 . US 7677174 B2 . US 7533609 B2 and US 7373882 B2 ,

Ein Auftragswechsel ist deshalb zwar nicht allein wegen der o. g. Reinigungsvorgänge mit Stillstandszeiten für die Druckmaschine verbunden, die Reinigungsvorgänge tragen aber erheblich zu den Stillstandszeiten bei.A job change is therefore not only connected with downtime for the printing press because of the above-mentioned cleaning processes, but the cleaning processes contribute significantly to the downtimes.

Es hat nicht an Ideen und Versuchen gefehlt, die Rüstzeit bei Offsetdruckmaschinen zu verringern, wobei besonderer Wert auf eine Verkürzung der Waschzeiten gelegt wurde. Einer dieser Vorschläge bestand darin, das Waschprogramm für die verschiedenen Druckwerke der Druckmaschine alle gleichzeitig ablaufen zu lassen. Das ist die heute übliche Art und Weise in der die Abläufe beim Waschen gesteuert werden, nämlich parallel. Es ist auch schon vorgeschlagen worden, Waschvorgänge dann durchzuführen, wenn die Druckplatten für den nächsten Auftrag gewechselt werden. Hierzu ist es dann aber beispielsweise erforderlich den Druckzylinder aus dem Räderzug für die einzelnen Zylinder der Druckmaschine abzukoppeln, um diesen für den Plattenwechsel separat antreiben bzw. bewegen zu können, während der Waschvorgang für den Gummizylinder läuft, bei dem dieser einem anderen Bewegungsablauf unterliegt.There has been no lack of ideas and attempts to reduce set-up time for offset printing presses, with particular emphasis on shortening wash times. One of these proposals was to run the washing program for the various printing units of the printing press all at the same time. This is the usual way in which the washing processes are controlled, namely in parallel. It has also been proposed to perform washing operations when the printing plates are changed for the next job. For this purpose, however, it is then necessary, for example, to decouple the impression cylinder from the gear train for the individual cylinders of the printing press in order to be able to drive or move it separately for the plate change while the washing process is running for the blanket cylinder in which it is subject to a different movement.

In der EP 0654350 B 1 wird vorgeschlagen, die Waschablaufprogramme variabel zu gestalten und beispielsweise vom Zeitverlauf, von Betriebsparametern der Druckmaschine oder dem Verschmutzungsgrad abhängig zu machen. Hierzu setzt die EP 0654350 B1 darauf, die Waschablaufprogramme vollautomatisch ablaufen zu lassen, um sie ganz dem Einfluss einer Bedienperson zu entziehen.In the EP 0654350 B 1 is proposed to make the wash sequence programs variable and to make, for example, the time course, operating parameters of the printing press or the degree of contamination. For this purpose, the EP 0654350 B1 to run the wash cycle programs fully automatically to completely remove the influence of an operator.

Mit solchen Ansätzen, bei denen versucht wird, die Rüstzeit allein durch eine isolierte Einflussnahme des Waschprogrammes oder der Waschzeiten selbst zu optimieren ist man jedoch zu kurz gesprungen. Denn es gibt eine Vielzahl weiterer Tätigkeiten, auch manueller Tätigkeiten die ein Drucker an einer Druckmaschine beim Auftragswechsel vorzunehmen hat. Dazu gehört unter anderem das Entleeren der Farbwannen, das händisch, durch sogenanntes "Ausspachteln" erfolgt. Hierbei wird eine in die Farbwanne bzw. den Farbkasten eingelegte Folie mit dem Farbrest entnommen und werden die sogenannten Farbkastenbacken gereinigt, das sind Teile, die den Farbkasten seitlich begrenzen und gegenüber dem Farbduktor abdichten. Hierzu gehört ebenfalls das Wiedereinlegen einer frischen Folie und das Wiedereinfüllen neuer Farbe in die Farbwanne entweder ebenfalls händisch mit dem Farbspachtel oder durch Einlegen einer entsprechenden neuen Farbkartusche in ein automatisches Nachfüllsystem, das über dem Farbkasten hin- und herfährt und diesen befüllt und gegebenenfalls nachdosiert.With such approaches, in which it is attempted to optimize the set-up time only by an isolated influence of the washing program or the washing times themselves but one jumped too short. Because there are a variety of other activities, including manual activities that a printer has to make on a printing press when changing jobs. This includes, among other things, the emptying of the paint pans, which is done manually, by so-called "filling out". Here, an inserted into the ink tray or ink fountain sheet is removed with the ink residue and the so-called ink jaws are cleaned, these are parts that limit the color box laterally and seal against the ink fountain roller. This also includes reinserting a fresh film and re-filling new paint in the paint tray either also manually with the paint spatula or by inserting a corresponding new ink cartridge in an automatic refill system that moves back and forth over the ink fountain and this filled and optionally replenished.

Das Ausspachteln der alten Farbe und das Wiedereinspachteln der neuen Farbe erfolgt naturgemäß dann, wenn nur ein einziger Drucker die Maschine bedient, sequentiell. Die Erfindung hat sich deshalb zum Ziel gesetzt, in einem solchen Fall d. h. bei einem Verfahren zum Reinigen von Farbwerken in Offsetdruckmaschinen, bei welchen die Farbwannen der einzelnen Farbwerke der Druckwerke sequentiell nacheinander entleert werden und danach wieder mit Farbe befüllt werden, die Rüstzeiten beim Auftragswechsel zu verringern.The filling of the old paint and the re-filling of the new paint naturally occurs when only a single printer operates the machine, sequentially. The invention has therefore set itself the goal, in such a case d. H. in a method for cleaning inking units in offset printing machines, in which the ink pans of the individual inking units of the printing units are sequentially emptied one after the other and then refilled with ink to reduce set-up times when changing jobs.

Diese Aufgabe wird dadurch gelöst, dass unmittelbar nach der Entleerung der ersten Farbwanne der Waschvorgang für das zugehörige Farbwerk gestartet wird, noch bevor die übrigen Farbwannen entleert sind, und jeweils nach Entleerung einer weiteren der übrigen Farbwannen der Waschvorgang für das jeweilige weitere Farbwerk gestartet wird, und dass mit der Wiederbefüllung der ersten Farbwanne begonnen wird, während noch Waschvorgänge für eine oder mehrere der weiteren Farbwerke laufen.This object is achieved in that immediately after the emptying of the first ink tray of the washing process for the associated inking is started before the other ink pans are emptied, and each time after emptying another of the other ink pans the washing process for the respective other inking is started and that the refilling of the first ink tray is started while still washing operations for one or more of the further inking units are underway.

Mit dieser Maßnahme wird der gesamte Prozess, nämlich die manuellen Tätigkeiten des Druckers beim Auftragswechsel zusammen mit den Waschsequenzen optimiert. Denn da bereits die Waschvorgänge in einzelnen Farbwerken beginnen, während die übrigen Farbwerke noch nicht entleert bzw. ausgespachtelt sind, werden diese Sequenzen auch früher wieder beendet, so dass der Drucker dort auch wieder mit dem Wiederbefüllen beginnen kann, während Waschprogramme für andere Farbwerke noch laufen. Die Gesamtzeit des Prozesses vom Beginn des Entleerens des ersten Farbkastens bzw. der Farbwanne bis zum Abschluss der Wiederbefüllung des letzten Farbwerks ist deshalb nochmals kürzer, verglichen mit dem Fall, dass erst gewaschen wird, nachdem alle Farbwannen entleert sind, selbst wenn sämtliche Waschvorgänge in allen Farbwerken gleichzeitig ablaufen.With this measure, the entire process, namely the manual activities of the printer during the job change along with the washing sequences is optimized. Because already begin the washing operations in individual inking units, while the remaining inking units are not emptied or filled out, these sequences are also terminated earlier, so that the printer can start there again with the refilling, while washing programs for other inking units are still running , The total time of the process from the start of the emptying of the first ink fountain or paint tray to the completion of the refilling of the last inking unit is therefore even shorter, compared with the case of washing only after all the ink pans have been emptied, even if all the washing operations in all Run inking at the same time.

Das Reinigungsprogramm für das Gummituch oder den Druckzylinder des zugehörigen Druckwerks kann bereits gestartet werden, während mit der Entleerung der ersten Farbwanne begonnen wird.The cleaning program for the blanket or the printing cylinder of the associated printing unit can already be started while the emptying of the first ink tray is started.

Sämtliche Farbwerke der Druckmaschine können auch gemeinsam über den Hauptantrieb der Druckmaschine angetrieben werden und in Bewegung sein, während der Drucker an der Entleerung der Farbwannen arbeitet. Ein separates Ein- und Abkoppeln einzelner Farbwerke speziell für den Reinigungsprozess ist nicht erforderlich.All of the inking units of the printing press can also be driven together via the main drive of the printing press and be in motion while the printer is working on emptying the ink pans. A separate coupling and uncoupling of individual inking units especially for the cleaning process is not required.

Besonders zweckmäßig für die Handhabung und Bedienung ist es, wenn das Ende der Entleerung der Farbwanne entweder automatisch erkannt wird und zum Start des Waschprogramms für das zugehörige Farbwerk verwendet wird, oder wenn am jeweiligen Farbwerk oder Druckwerk in Reichweite des Druckers, der dort die Farbwanne entleert, ein Schalter oder Taster angebracht ist, mit dem dieser dann die Waschsequenz starten kann, ohne sich ans Steuerpult der Druckmaschine begeben zu müssen. Beispielsweise kann das durch einen Sensor geschehen, der das Abklappen der Farbwanne vom Farbduktor erkennt, also die Bewegung, die vom Drucker am Ende der Entleerung durchgeführt wird. Ein solcher Sensor, Taster oder Schalter dient nicht allein der Bequemlichkeit des Druckers, sondern verringert die Rüstzeit, da dieser seine Arbeit nicht unterbrechen muss, um die Waschsequenz am Steuerpult zu starten, sondern sofort am nächsten Druckwerk mit der Entleerung der Farbwanne beginnen kann. Des Weiteren können den Farbwannen, Farbwerken oder Druckwerken der Druckmaschine Anzeigeeinrichtungen zugeordnet sein, die mit der Steuerung für das Farbwerkswaschen verbunden sind und dem Drucker die Reihenfolge der Entleerung der Farbwerkswannen durch entsprechende optische Signale anzeigen.Especially useful for handling and operation, it is when the end of the emptying of the ink pan is either automatically detected and used to start the wash program for the associated inking, or if the respective inking unit or printing unit within reach of the printer, which emptied there the paint tray , a switch or button is attached, with which this can then start the washing sequence without having to go to the control panel of the printing press. For example, this can be done by a sensor that detects the folding of the ink tray of the ink fountain roller, so the movement that is performed by the printer at the end of the emptying. Such a sensor, pushbutton or switch not only serves the convenience of the printer, but reduces the set-up time, as this does not have to interrupt his work to start the washing sequence on the control panel, but immediately on the next printing unit with the emptying of the ink tray can begin. Furthermore, the ink pans, inking units or printing units of the printing machine can be associated with display devices which are connected to the controller for the inking unit washing and the printer to indicate the order of emptying of the ink fountain by corresponding optical signals.

Weitere Vorteile der Erfindung ergeben sich aus den Unteransprüchen und werden nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die beigefügten Figuren der Zeichnungen näher erläutert.

  • Figur 1 ist die Prinzipskizze einer Bogenoffsetdruckmaschine mit vier Druckwerken.
  • Figur 2 ist die Prinzipskizze eines Farbwerks der Bogenoffsetdruckmaschine aus Figur 1, modifiziert gemäß der vorliegenden Erfindung.
  • Figur 3 ist ein erstes Ablaufdiagramm, das den herkömmlichen zeitlichen Ablauf der Arbeiten an einem Farbwerk während eines Auftragswechsels wiedergibt.
  • Figur 4 ist ein zweites Ablaufdiagramm, das den zeitlichen Ablauf der Arbeiten am Farbwerk während des Auftragswechsels gemäß der Erfindung wiedergibt.
  • Figur 1 zeigt eine Offsetdruckmaschine 1 in Reihenbauweise mit einem Anleger 2, in dem sich der unbedruckte Papierstapel 3 befindet, sowie vier Druckwerken 7a - d für die vier Grundfarben Schwarz, Gelb, Magenta und Cyan. Zwischen den Druckwerken werden die zu bedruckenden Bögen von Transfertertrommeln 12 a - c zu den jeweiligen Gegendruckzylindern 4b - d der Druckwerke befördert. Auf das vierte Druckwerk 7d folgt der Ausleger 9 der Druckmaschine. Darin laufen Greiferbrücken 11 mittels einer Kettenführung um. Diese Greiferbrücken 11 übernehmen den bedruckten Bogen und führen ihn dem Bogenstapel 10 zu, wo er abgelegt wird.
Further advantages of the invention will become apparent from the dependent claims and are explained in more detail using an exemplary embodiment with reference to the accompanying figures of the drawings.
  • FIG. 1 is the schematic diagram of a sheetfed offset press with four printing units.
  • FIG. 2 is the schematic diagram of an inking unit of the sheetfed offset press FIG. 1 Modified according to the present invention.
  • FIG. 3 FIG. 11 is a first flowchart showing the conventional timing of ink fountain work during a job change.
  • Figure 4 is a second flow chart showing the timing of the inking work during the job change according to the invention.
  • FIG. 1 shows an offset printing machine 1 in a row construction with a feeder 2, in which the unprinted paper stack 3 is located, and four printing units 7a - d for the four primary colors black, yellow, magenta and cyan. Between the printing units, the sheets to be printed are conveyed by transfer drums 12a-c to the respective counter-pressure cylinders 4b-d of the printing units. On the fourth printing unit 7d follows the boom 9 of the printing press. In it gripper bars 11 run around by means of a chain guide. These gripper bars 11 take over the printed sheet and lead it to the sheet stack 10, where it is stored.

Jedes der vier Druckwerke 7a - d besitzt einen Gegendruckzylinder 4a, einen Gummituchzylinder 5a sowie einen Druckformzylinder 6a, auf den die jeweilige Druckplatte aufgespannt ist. Eingefärbt werden die Druckplatten durch Farbwerke 8a - d, von denen eines nachstehend noch näher beschrieben werden.Each of the four printing units 7a-d has an impression cylinder 4a, a blanket cylinder 5a and a printing form cylinder 6a, on which the respective printing plate is mounted. The printing plates are dyed by inking units 8a-d, one of which will be described in more detail below.

Die Funktionen in den Druckwerken 7a - d, dem Anleger 2 und dem Anleger 9 werden von einer Maschinensteuerung 56 aus bedient, gesteuert und überwacht.The functions in the printing units 7a-d, the feeder 2 and the feeder 9 are operated, controlled and monitored by a machine control 56.

Das in Figur 2 dargestellte Farbwerk besitzt eine Farbwanne 13, eine Duktorwalze 14, vier Farbauftragswalzen 28, 29, 30 und 31, mit denen die Druckplatte auf dem Zylinder 6a eingefärbt wird, und eine Reihe weiterer Walzen 15 bis 27, von denen die Farbe vom Duktor 14 abgenommen, verteilt und verrieben und sodann den Auftragswalzen zugeführt wird. Mit 15 ist der taktweise zwischen dem Duktor 14 und der Walze 21 pendelnde Farbheber bezeichnet. Bei den Walzen 21, 22, 23 und 24 handelt es sich um traversierende Reiberwalzen, wobei die Reiber 23 und 24 gekühlt sind. Der Duktor 15 sowie die Walzen 16, 17, 18, 19, 20 sind ebenso wie die vier Farbauftragswalzen 28 bis 31 mit einem Gummimantel versehen, während die Brückenwalze 32, die zwischen der Feuchtauftragswalze 37 und der ersten Farbauftragswalze 28 angeordnet ist, ebenso wie die Walzen 27, 26 und 25 Stahlwalzen sind.This in FIG. 2 shown inking unit has a paint tray 13, a ductor roller 14, four inking rollers 28, 29, 30 and 31, with which the printing plate is inked on the cylinder 6a, and a number of other rollers 15 to 27, of which the color of the ductor 14 removed, distributed and triturated and then fed to the applicator rolls. With 15 of the clockwise between the ductor 14 and the roller 21 oscillating color lifter is designated. The rollers 21, 22, 23 and 24 are traversing distributor rollers, the drivers 23 and 24 being cooled. The ductor 15 and the rollers 16, 17, 18, 19, 20, as well as the four inking rollers 28 to 31 are provided with a rubber jacket, while the bridge roller 32, between the Dampening roller 37 and the first inking roller 28 is arranged, as well as the rollers 27, 26 and 25 are steel rollers.

Für das Waschen des Farbwerks ist eine Wanne 42 mit einer Waschrakel 41 vorgesehen, die an die Walze 24 angestellt werden kann. Weiterhin sind Sprührohre 43 und 44 vorgesehen, von denen im Zuge der von einer Steuerung ausgegebenen Steuerbefehle an zwei Ventile 53 und 54 und Waschflüssigkeiten in das Farbwerk gesprüht werden können.For washing the inking unit, a trough 42 with a washing blade 41 is provided, which can be placed against the roller 24. Furthermore, spray pipes 43 and 44 are provided, of which can be sprayed in the course of issued by a control commands to two valves 53 and 54 and wash liquids in the inking unit.

Die Farbwanne 13 ist wie durch den Pfeil 51 symbolisiert um eine Achse 50 schwenkbar und kann so nach ihrer Entleerung von Duktor 14 wegbewegt und an einen Anschlag 52 arretiert werden. An diesem Anschlag ist ein Endschalter 57 angebracht, durch den die vollzogene Abstellbewegung der Farbwanne erkannt und an den Teil 55 der Steuerung 56 signalisiert wird, der für die Waschvorgänge zuständig ist.The ink tray 13 is symbolized by the arrow 51 pivotable about an axis 50 and can be moved away so after their emptying of ductor 14 and locked to a stop 52. At this stop, a limit switch 57 is attached, recognized by the completed Abstellbewegung the paint tray and is signaled to the part 55 of the controller 56, which is responsible for the washing operations.

Bei einem Auftragswechsel geht der Drucker bisher nach dem Stand der Technik wie folgt vor (Figur 3: oben): Hierbei wird angenommen, dass drei der vier Farbwerke gereinigt werden müssen, während im vierten Farbwerk z. B. die Farbe Schwarz verbleiben kann.In the case of a job change, the printer has hitherto proceeded according to the prior art as follows ( FIG. 3 : above): It is assumed that three of the four inking units must be cleaned, while in the fourth inking unit z. B. the color black can remain.

Das Waschen der Gummituch- und eventuell Druckzylinder startet in allen Druckwerken, die bei dem zu Ende gegangenen Auftrag benutzt wurden. Dies wird durch den mit GTW bezeichneten Balken symbolisiert. Zeitgleich mit dem Start des Waschens dieser Zylinder beginnt der Drucker die Farbe aus der Farbwanne des ersten Druckwerks 1 auszuspachteln. Die dafür erforderliche Zeit gibt der mit DW 1 bezeichnete Balken wieder. Anschließend klappt er die Farbwanne vom Duktor ab und begibt sich zum nächsten Druckwerk, wo er auch dort mit der Entleerung fortfährt. Das ist durch den mit DW 2 bezeichneten Balken symbolisiert. Danach erfolgt der gleiche Vorgang für das Druckwerk 3 (DW 3).The washing of the blanket and possibly printing cylinders starts in all printing units that were used at the end of the order. This is symbolized by the bar labeled GTW. Simultaneously with the start of the washing of these cylinders, the printer begins to paint the ink from the ink tray of the first printing unit 1. The time required for this is indicated by the bar labeled DW 1. He then unfolds the ink tray from the ductor and goes to the next printing unit, where he continues with the emptying there. This is symbolized by the bar labeled DW 2. Thereafter, the same process for the printing unit 3 (DW 3).

Anschließend begibt sich der Drucker zum Steuerpult und startet die Waschvorgänge für die Farbwerke in den Druckwerken 1 bis 3, die dann alle gleichzeitig ablaufen. Das ist durch die drei übereinanderliegenden Balken symbolisiert, die jeweils mit FW 1 bis FW 3 bezeichnet sind.Then the printer goes to the control panel and starts the washing operations for the inking units in the printing units 1 to 3, which then all run at the same time. This is symbolized by the three superimposed bars, which are each labeled FW 1 to FW 3.

Sobald diese Waschvorgänge abgeschlossen sind, füllt der Drucker wieder Farbe in den Druckwerken 1 bis 3 nach (Balken DW 1 bis DW 3). Da die Farbwerkswaschvorgänge FW ca. 3 Minuten dauern, bedeutet dies Wartezeit für den Drucker, bevor er mit dem Wiederbefüllen der Farbwannen beginnen kann.As soon as these washing processes have been completed, the printer refills ink in the printing units 1 to 3 (bars DW 1 to DW 3). It takes about 3 minutes for the inking unit wash FW to wait for the printer before it can start refilling the ink pans.

Der Ablauf gemäß der Erfindung ist dann in der Figur 3 im unteren Teil dargestellt: Auch hier startet das Waschen des Gummituchs und anderer Zylinder außerhalb des Farbwerks gleich nachdem der vorherige Druckauftrag beendet ist Wieder beginnt der Drucker zeitgleich damit, die Farbe aus den Druckwerken 1 bis 3 nacheinander auszuspachteln (Balken DW 1 bis DW 3).The sequence according to the invention is then in the FIG. 3 in the lower part: Here too the washing of the blanket and other cylinders outside of the inking unit starts immediately after the previous print job is finished. Again, the printer starts filling out the ink from the printing units 1 to 3 one after the other (bars DW 1 to DW 3) ,

Sobald er jedoch die erste Farbwanne geleert hat und vom Duktor abklappt, wird durch die Abklappbewegung der Schalter 57 betätigt, von dem der Steuerung 55 für das Farbwerkwaschen gemeldet wird, dass die Farbwanne 13 leer ist. Dieser Steuerungsteil 55 in der Steuerkonsole 56 der Druckmaschine beginnt dann, sobald das Waschen des Gummituchzylinders und Druckzylinders abgeschlossen ist damit, den Farbwerkswaschvorgang FW 1 für das erste Farbwerk zu starten. Während dieser mit FW 1 bezeichnete Vorgang noch läuft werden vom Drucker die Wannen der Farbwerke in den weiteren Druckwerken 2 bis 3 entleert und wird von der Steuerung jedes Mal nach Abklappen der jeweiligen Wanne 13 die Farbwerkswaschsequenz für das zugehörige Farbwerk gestartet.However, as soon as he has emptied the first ink tray and is folded away from the ductor, the Abklappbewegung the switch 57 is actuated, is reported by the controller 55 for the inking unit that the ink tray 13 is empty. This control part 55 in the control console 56 of the printing press then starts, as soon as the washing of the blanket cylinder and printing cylinder is completed to start the Farbwerkswaschvorgang FW 1 for the first inking unit. While this process, designated FW 1, is still in progress, the printer empties the troughs of the inking units in the further printing units 2 to 3, and the inking system washing sequence for the associated inking unit is started by the control unit every time the respective tray 13 is folded down.

Sobald die Waschsequenz FW 1 für das erste Farbwerk beendet ist kann der Drucker sofort mit dem Wiederbefüllen des ersten Druckwerks DW 1 beginnen und dann auch die übrigen Wannen für die Farbwerke in den Druckwerken 2 und 3, sobald jeweils in dem dortigen Farbwerk der Waschvorgang abgeschlossen ist.As soon as the washing sequence FW 1 for the first inking unit has ended, the printer can immediately start refilling the first printing unit DW 1 and then also the remaining trays for the inking units in the printing units 2 and 3 as soon as the washing operation is completed in the respective inking unit ,

Insgesamt verkürzen sich daher die für das Reinigen der Farbwerke erforderlichen Rüstzeiten von bisher 12 Minuten wie in dem Diagramm nach Figur 3 unten angegeben auf ca. 9 Minuten, obwohl die Waschvorgänge für die Farbwerke in den Druckwerken 1 bis 3 nicht parallel, sondern teils überlappend sequentiell durchgeführt werden, im Grunde durch eine verkürzte Wartezeit für den Drucker. Zudem ist es nicht erforderlich, den Räderzug der Druckmaschine, von dem die verschiedenen Zylinder einschließlich Gummituchzylinder, Plattenzylinder und Farbwerk angetrieben werden, aufzutrennen. Denn sämtliche Waschvorgänge können durchgeführt werden, während die Maschine mit der für die Waschvorgänge reduzierten Geschwindigkeit in Bewegung bleibt.Overall, therefore, the set-up time required for cleaning the inking units of previously 12 minutes shorten as shown in the diagram after FIG. 3 below given to about 9 minutes, although the washing operations for the inking units in the printing units 1 to 3 are not performed in parallel, but partly overlapping sequentially, basically by a shortened waiting time for the printer. In addition, it is not necessary, the gear train the printing press, from which the various cylinders are driven, including blanket cylinder, plate cylinder and inking unit, separate. All washings can be carried out while the machine is kept moving at the speed that is reduced for washing.

Vorstehend wurde die Erfindung anhand einer Druckmaschine mit einem herkömmlichen Farbwerk mit Wanne und Duktor beschrieben. Die geschilderten Abläufe können jedoch in gleicher Weise auch bei Offsetdruckmaschinen mit sogenannten Kurzfarbwerken realisiert werden. In diesem Falle wird anstelle der Farbwanne ein Kammerrakel verwendet, das für die Reinigung zwar nicht von dem dort nicht vorhandenen Duktor, sondern von der Rasterwalze abgeklappt wird, an dem das Kammerrakel während des Druckens sonst anliegt.The invention has been described above with reference to a printing press with a conventional inking unit with trough and ductor. However, the described processes can be realized in the same way also in offset printing machines with so-called short inking units. In this case, a chamber doctor blade is used instead of the ink tray, which is not folded for cleaning by the non-existent there ductor, but by the anilox roller to which the chamber doctor blade otherwise applied during printing.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
OffsetdruckmaschineOffset
22
Anlegerinvestor
33
Papierstapelstack of paper
4a - d4a - d
GegendruckzylinderImpression cylinder
5a - d5a - d
GummituchzylinderBlanket cylinder
6a - d6a - d
DruckformzylinderPlate cylinder
7a - d7a - d
Druckwerkprinting unit
8a - d8a-d
Farbwerkinking
99
Auslegerboom
1010
Bogenstapelsheet pile
1111
Greiferbrückegripper
1212
TransfertertrommelnTransfer tert drums
1313
Farbwannepaint tray
1414
Duktorwalze / FarbduktorDuctor roller / Farbduktor
15 bis 2715 to 27
Walzeroller
28 bis 3128 to 31
FarbauftragswalzeInking roller
3232
Brückenwalzebridge roller
3737
FeuchtauftragswalzeDampener roller
4141
Waschrakelwash-up blades
4242
Wannetub
43, 4443, 44
Sprührohrlance
5050
Achseaxis
5151
Pfeilarrow
5252
Anschlagattack
53, 5453, 54
VentilValve
5555
Steuerungsteilcontrol part
5656
Maschinensteuerungmachine control
5757
Endschalterlimit switch

Claims (11)

Verfahren zum Reinigen von Farbwerken in Offset-Druckmaschinen, bei welchen die Farbwannen (13) der einzelnen Farbwerke (8a - d) der Druckwerke (7a - d) sequentiell nacheinander entleert werden und danach wieder mit Farbe befüllt werden,
dadurch gekennzeichnet,
dass unmittelbar nach der Entleerung der ersten Farbwanne (13) der Waschvorgang für das zugehörige Farbwerk gestartet wird noch bevor die übrigen Farbwannen entleert sind, und jeweils nach Entleerung einer weiteren der übrigen Farbwannen der Waschvorgang für das jeweilige weitere Farbwerkt gestartet wird, und dass mit der Wiederbefüllung der ersten Farbwanne (13) begonnen wird, während Waschvorgänge für eine oder mehrere der weiteren Farbwerke noch laufen.Method for cleaning inking units in offset printing machines, in which the ink pans (13) of the individual inking units (8a-d) of the printing units (7a-d) are emptied sequentially one after the other and are then filled again with ink,
characterized,
that immediately after the emptying of the first ink tray (13) of the washing process for the associated inking is started before the other ink pans are emptied, and after emptying a further of the remaining ink pans of the washing process for the respective further inking is started, and that with the Refilling the first ink tray (13) is started while washing operations for one or more of the other inking units are still running. Verfahren nach Anspruch 1,
wobei mit dem Wiederbefüllen der nächsten der weiteren Farbwannen stets dann begonnen wird, sobald das Waschprogramm für das jeweilige zugehörige Farbwerk beendet ist.Method according to claim 1,
wherein the refilling of the next of the further ink pans is always started as soon as the washing program for the respective associated inking unit is completed. Verfahren nach Anspruch 1,
wobei bereits während der Entleerung der ersten Farbwanne ein Reinigungsprogramm für das Gummituch oder den Druckzylinder des zugehörigen Druckwerks gestartet wird.Method according to claim 1,
wherein already during the emptying of the first ink tray, a cleaning program for the blanket or the printing cylinder of the associated printing unit is started. Verfahren nach Anspruch 1,
wobei die Farbwerke der Druckmaschine gemeinsam über den Hauptantrieb der Druckmaschine angetrieben sind und während des Entleerens zumindest einer der weiteren Farbwannen in Bewegung sind.Method according to claim 1,
wherein the inking units of the printing press are driven together via the main drive of the printing press and during the emptying of at least one of the further ink pans are in motion. Verfahren nach Anspruch 1,
wobei die jeweilige Farbwanne (13) nach ihrer Entleerung vom Farbduktor (14) wegbewegt wird und im Zuge der Wegbewegung ein Signal für den Start des Waschvorganges für das zugehörige Farbwerk generiert wird.Method according to claim 1,
wherein the respective ink tray (13) is moved away from the ink fountain roller (14) after its emptying and in the course of the movement away a signal for the start of the washing process for the associated inking unit is generated. Verfahren nach Anspruch 1,
wobei die jeweilige Farbwanne ein Kammerrakel ist, das nach ihrer Entleerung von der zugehörigen Rasterwalze wegbewegt wird.Method according to claim 1,
wherein the respective ink tray is a chambered doctor blade, which is moved away from the associated anilox roller after its emptying. Offsetdruckmaschine mit mehreren Druckwerken (7a - d) und diesen zugeordneten Farbwerken (8a - d) sowie einer Steuerung (55/56) für das automatische Steuern von Waschvorgängen in den Farbwerken der Druckwerke, wobei die Farbwerke Duktorfarbwerke oder Anilox-Farbwerke sind und jeweils Farbwannen bzw. Kammerrakel besitzen, in denen die Druckfarbe aufgenommen ist und die von Duktor- bzw. einer Rasterwalze wegbewegbar sind,
dadurch gekennzeichnet,
dass entweder den Farbwannen (13) Sensoren (57) zugeordnet sind von denen die jeweilige Wegbewegung oder der Füllstand der Wanne (13) detektiert wird oder an den Druckwerken (7a - d) Schalter, Tasten etc. angeordnet sind und die Sensoren, Schalter, Tasten etc. entsprechende Signale generieren, die der Steuerung für die Waschvorgänge zugeordnet sind, derart, dass durch die jeweilige Wegbewegung, aufgrund Füllstands oder durch die Betätigung des jeweiligen Schalters oder Tasters ein Waschprogramm für das Farbwerk startbar ist.Offset printing machine with a plurality of printing units (7a-d) and associated inking units (8a-d) and a controller (55/56) for the automatic control of washing operations in the inking units of the printing units, wherein the inking units are ductor inking units or anilox inking units and in each case color trays or chambered doctor blade, in which the printing ink is accommodated and which can be moved away from the ductor or an anilox roller,
characterized,
that either the color wells (13) sensors (57) are allocated of which the respective movement away or the filling level of the tub (13) is detected, or on the printing units (7a - d) switches, keys are arranged, etc., and the sensors, switches, Buttons etc. generate corresponding signals that are assigned to the controller for the washing operations, such that a wash program for the inking unit can be started by the respective movement away, due to level or by the operation of the respective switch or button. Verfahren nach Anspruch 7,
wobei die Farbwannen (13) oder Kammerrakel abklappbar sind.Method according to claim 7,
wherein the ink pans (13) or chamber doctor blade are hinged. Verfahren nach Anspruch 7,
wobei die Steuerung für das Steuern der Waschvorgänge Teil (55) der Maschinensteuerung (56) der Druckmaschine (1) ist.Method according to claim 7,
wherein the controller for controlling the washing operations is part (55) of the machine control (56) of the printing machine (1). Verfahren nach Anspruch 7,
wobei den Farbwannen, Farbwerken oder Druckwerken Anzeigeeinrichtungen zugeordnet sind, die mit der Steuerung für das Farbwerkswaschen verbunden sind und entsprechend der Reihenfolge der Entleerung der Farbwerkswannen angesteuert werden.Method according to claim 7,
wherein the ink pans, inking units or printing units are associated with display devices which are connected to the controller for the inking unit washing and are driven according to the order of emptying the inking unit pans. Verfahren nach Anspruch 7,
wobei die Farbwannen jeweils die Kammerrakel eines Kurzfarbwerks sind.Method according to claim 7,
wherein the ink pans are each the chamber doctor blade of a short inking unit.
EP20120162941 2011-05-02 2012-04-03 Method for cleaning colour decks in offset printers and offset printer Active EP2520431B1 (en)

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EP2520431B1 (en) 2014-03-12
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US20120279408A1 (en) 2012-11-08
US8887635B2 (en) 2014-11-18
CN102774133B (en) 2016-01-20
EP2520431A3 (en) 2013-02-20
JP2012232587A (en) 2012-11-29
CN102774133A (en) 2012-11-14

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