EP0653301A1 - Method and device for controlling the automatic plate exchange process in printing machines - Google Patents

Method and device for controlling the automatic plate exchange process in printing machines Download PDF

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Publication number
EP0653301A1
EP0653301A1 EP94116680A EP94116680A EP0653301A1 EP 0653301 A1 EP0653301 A1 EP 0653301A1 EP 94116680 A EP94116680 A EP 94116680A EP 94116680 A EP94116680 A EP 94116680A EP 0653301 A1 EP0653301 A1 EP 0653301A1
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EP
European Patent Office
Prior art keywords
plate
printing plate
printing
register
detection area
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Granted
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EP94116680A
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German (de)
French (fr)
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EP0653301B1 (en
Inventor
Bernd Lindner
Nikola Pupic
Helmut Schild
Berthold Seib
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication of EP0653301A1 publication Critical patent/EP0653301A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F27/00Devices for attaching printing elements or formes to supports
    • B41F27/12Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1206Feeding to or removing from the forme cylinder
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00Printing
    • Y10S101/36Means for registering or alignment of print plates on print press structure

Definitions

  • the invention relates to a method and a device for controlling an automated printing plate changing process according to the preamble of claims 1 and 6.
  • a printing plate is attached to the plate cylinder by means of a tensioning rail assigned to the start of printing and to the end of printing.
  • the tensioning rails are arranged in a pit of the plate cylinder.
  • the clamp at the end of the print is released and the plate is removed by turning the plate cylinder backwards until the clamp at the start of the print can also be released.
  • a new printing plate is inserted with its front edge into the printing start clamping rail, clamped and then the plate cylinder is rotated in the forward direction until the trailing end of the printing plate can be inserted into the printing end clamping rail and clamped there.
  • the pressure plate is tensioned via the pressure end tensioning rail.
  • DE 41 30 359 A1 discloses a device and a method for changing printing plates of a printing press, in which the printing plate change can be carried out both semi-automatically and fully automatically. Especially in the semi-automatic working mode it is provided that the operator controls the changing process by repeatedly operating controls. Depending on the large number of sub-processes to be triggered, this can be complex.
  • a semi-automatic printing plate feed system is known as PPL (Power Plate Loading) from MAN Roland Druckmaschinen AG and is used on R 700 series machines.
  • PPL Power Plate Loading
  • the printer only has to remove one printing plate and one from the plate cylinder through a slot in the slide protection Feed the new pressure plate to the plate cylinder.
  • pneumatically movable sliding protection is provided with a guide device which is pivotably mounted and removable with respect to the plate cylinder. The remotely controlled clamping, unclamping and the corresponding positioning processes of the plate cylinder are triggered by the printer via operating elements.
  • the object of the present invention is therefore to further develop a method and a device in accordance with the corresponding preamble in such a way that, in the case of a semi-automatic printing plate change process, the number of commands to be entered by the printer on operating elements is as small as possible and, furthermore, there is an increase in a fully automatic printing plate change process Interference immunity results.
  • the register pins which can in particular be interrogated electrically, are not only used to determine whether a new printing plate to be fed has been inserted in the printing start tensioning rail in register, whereupon the clamping process is initiated. According to the invention, the register pins are also queried to determine whether the used printing plate has been removed from the pressure start clamping rail (clamping released).
  • the register pins which can in particular be interrogated electrically, are also used not only to determine whether the used printing plate has been removed from the opened pressure start clamping rail and also whether a newly inserted printing plate is in register (clamping rail open) .
  • the clamping process is provided and then check the register pins again. This repeated query can be used to determine whether there is a possible shift in position due to the clamping of the pressure plate.
  • the register pins which can in particular be interrogated electrically, are interrogated separately, i.e. it can be determined and can also be signaled acoustically by means of corresponding light-emitting diodes or whether the pressure plate is not correctly in contact with either the register pin on the drive or operating side.
  • the plate change command was entered (start) on a printing unit or centrally at a control center, which is done by pressing a corresponding command button.
  • the plate cylinder is then positioned in a certain angular position, which is done by moving forward or backward.
  • the tension and the clamping on the pressure end tensioning rail (DE) are released by activating the appropriate actuating means.
  • the used pressure plate is now included conveyed in front of its rear edge, for example, into an automatic printing plate changer or into a receiving device to be disposed of manually.
  • the positioning of the plate cylinder takes place in particular in the angular position which also serves to insert the front edge of a new printing plate to be fed into the corresponding pressure start clamping rail (DA).
  • DA pressure start clamping rail
  • the pressure start clamping rail (DA) is opened. So the clamping is released. Then there is an interrogation of the register pins attached in the plate cylinder and in the pressure start clamping rail there. This determines whether the pressure plate is still in contact with both register pins.
  • the programmed sequence is interrupted at this point by a continuous query (waiting loop).
  • this query is carried out over a predetermined interval, for example one second (1S), i.e. the program continues to run only if both register pins have no contact with the printing plate for at least this time interval (register pins off? - yes).
  • a further query is made as to whether a new printing plate has been inserted into the print start clamping rail (DA) according to the register (new plate in the DA rail). Again it is envisaged that this is a certain time interval, e.g. For 1 second (register pins on?), Which is taken as an indication that the printing plate is correctly fitted. If the intended criterion is not met (no), the query is repeated until this is the case. If this criterion is met (yes), the pressure start clamping rail (DA) is closed in a next program step. The pressure plate is thus clamped on its front edge.
  • the pressure plate is pulled open by turning the plate cylinder forward accordingly, then inserting the pressure end (DE) of the pressure plate into the corresponding tensioning rail, clamping and tensioning the pressure plate. Shutdown may also take place during the mounting process of devices attached to the plate cylinder. After all the specified actions have been carried out, the printing plate change has ended (end).
  • a plate change on a printing unit has been described above. The same procedure is followed for the other printing units. It can be provided that the operator triggers the change process on each printing unit via one or more buttons - as can be seen, no further commands are necessary during the changing process on a printing unit.
  • the procedure of the invention is very advantageous if, in the case of a multicolour machine, since the command "plate change" only has to be given once (first printing unit or control station) and the control system is programmed such that after the end of the plate change in the first printing unit the corresponding processes and the positioning of the plate cylinder are immediately initiated in the following printing unit. Because of the query according to the invention, the control sequence is interrupted until the new plate has been fed. The same applies to the other printing units.

Abstract

The invention describes a method and a device for controlling an automatic plate exchange process in a sheet-fed offset printing machine, in which a used printing plate is removed from the gripping region of a clamping rail assigned to the leading edge of the plate cylinder and a new printing plate is then introduced into the opened gripping region, fixing of the in-register position of the newly introduced printing plate taking place before the gripping region is closed (clamped). This method is to be designed in such a way as to result in increased safety and reliability in the course of the plate exchange process. Before it is established whether the newly introduced printing plate lies in register in the gripping region of the clamping rail, it is checked whether the used printing plate has been removed from the gripping region, for which it is established whether the used printing plate is not in an in-register position with its leading edge. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zum Steuern eines automatisierten Druckplattenwechselvorganges gemäß dem Oberbegriff von Anspruch 1 und 6.The invention relates to a method and a device for controlling an automated printing plate changing process according to the preamble of claims 1 and 6.

Bei Bogenoffsetdruckmaschinen wird eine Druckplatte auf den Plattenzylinder mittels einer dem Druckanfang und einer dem Druckende zugeordneten Spannschiene befestigt. Die Spannschienen sind dabei in einer Grube des Plattenzylinders angeordnet. Zum Wechseln einer Druckplatte wird zunächst die Klemmung am Druckende gelöst und die Druckplatte durch Rückwärtsdrehen des Plattenzylinders von diesem abgefördert, bis daraufhin die Klemmung am Druckanfang ebenfalls gelöst werden kann. Eine neue Druckplatte wird mit ihrer Vorderkante in die Druckanfang-Spannschiene eingelegt, geklemmt und daraufhin der Plattenzylinder in Vorwärtsrichtung gedreht, bis das nachlaufende Ende der Druckplatte in die Druckende-Spannschiene eingeführt und dort geklemmt werden kann. Es erfolgt das Spannen der Druckplatte über die Druckende-Spannschiene.In sheetfed offset printing machines, a printing plate is attached to the plate cylinder by means of a tensioning rail assigned to the start of printing and to the end of printing. The tensioning rails are arranged in a pit of the plate cylinder. To change a printing plate, the clamp at the end of the print is released and the plate is removed by turning the plate cylinder backwards until the clamp at the start of the print can also be released. A new printing plate is inserted with its front edge into the printing start clamping rail, clamped and then the plate cylinder is rotated in the forward direction until the trailing end of the printing plate can be inserted into the printing end clamping rail and clamped there. The pressure plate is tensioned via the pressure end tensioning rail.

Bei herkömmlichen Druckmaschinen werden die oben beschriebenen Vorgänge durch den Drucker ausgeführt und sind entsprechend zeitaufwendig. Zur Rüstzeitverkürzung sind in jüngerer Zeit sogenannte voll- bzw. halbautomatische Druckplattenwechselsysteme bekannt geworden, bei denen die gebrauchte Druckplatte vom Plattenzylinder in ein Magazin bzw. eine Speicherkammer und die neu zuzuführende Druckplatte von eben diesem Magazin bzw. Speicherkammer auf den Plattenzylinder aufgebracht wird. Der Plattenzylinder weist dazu Einrichtungen auf, mittels denen die Klemm- und Spannvorgänge fernangesteuert auslösbar sind.In conventional printing presses, the operations described above are performed by the printer and are accordingly time consuming. To shorten makeready times, so-called fully or semi-automatic printing plate changing systems have recently become known, in which the used printing plate from the plate cylinder into a magazine or a storage chamber and the new printing plate to be fed from this magazine or storage chamber to the Plate cylinder is applied. For this purpose, the plate cylinder has devices by means of which the clamping and clamping processes can be triggered remotely.

Aus der DE 41 30 359 A1 ist eine Vorrichtung und ein Verfahren zum Wechseln von Druckplatten einer Druckmaschine bekannt, bei dem der Druckplattenwechsel sowohl halb- als auch vollautomatisch durchführbar ist. Gerade im halbautomatischen Arbeitsmodus ist vorgesehen, daß die Bedienperson den Wechselvorgang durch mehrmaliges Betätigen von Bedienelementen steuert. Je nach der Vielzahl der auszulösenden Teilvorgänge kann sich dies als aufwendig gestalten.DE 41 30 359 A1 discloses a device and a method for changing printing plates of a printing press, in which the printing plate change can be carried out both semi-automatically and fully automatically. Especially in the semi-automatic working mode it is provided that the operator controls the changing process by repeatedly operating controls. Depending on the large number of sub-processes to be triggered, this can be complex.

Aus der DE 39 40 796 C2 ist ein Verfahren und eine Einrichtung zum automatischen Wechseln einer Druckplatte bekannt, bei welchem ein sogenannter Lagedetektor das registergerechte Anlegen einer Druckplatte in der Druckanfang-Schiene feststellt und daraufhin das Klemmen ausgelöst wird.From DE 39 40 796 C2 a method and a device for automatically changing a printing plate is known, in which a so-called position detector detects the registration of a printing plate in the pressure start rail and the clamping is then triggered.

Aus der EP 0 555 782 A1 ist es bekannt, mittels elektrisch gegenüber dem Plattenzylinder isolierten Registerstiften, welche mit entsprechenden Stanzungen in der Druckplatte zusammenwirken, die registergerechte Lage festzustellen. Liegt die Druckplatte mit ihren Stanzungen korrekt an eben diesen elektrisch isolierten Registerstiften an, so wird ein durch eine Steuerung abfragbarer Stromkreis geschlossen.It is known from EP 0 555 782 A1 to determine the correct position by means of register pins which are electrically insulated from the plate cylinder and which cooperate with corresponding punchings in the printing plate. If the pressure plate with its punchings lies correctly against these electrically insulated register pins, a circuit which can be queried by a control system is closed.

Ein halbautomatisch arbeitendes Druckplatteneinzugssystem ist unter der Bezeichnung PPL (Power Plate Loading) der MAN Roland Druckmaschinen AG bekannt und an Maschinen der Baureihe R 700 im Einsatz. Bei dieser in der DE-Zeitschrift Druckwelt 4/25.02.1993, Seite 24ff, aufgezeigten und ferner in der nicht vorveröffentlichten DE-Patentanmeldung P 42 15 969 beschriebenen Einrichtung muß der Drucker lediglich eine vom Plattenzylinder durch einen Schlitz im Schiebeschutz herausgeförderte Druckplatte entnehmen und eine neu zuzuführende Druckplatte dem Plattenzylinder zuführen. In dem pneumatisch bewegbaren Schiebeschutz ist dazu eine schwenkbar bezüglich dem Plattenzylinder an- und abstellbar gelagerte Leiteinrichtung vorgesehen. Das fernbetätigte Klemmen -, entklemmen sowie die entsprechenden Positioniervorgänge des Plattenzylinders werden dabei durch den Drucker über Bedienelemente ausgelöst.A semi-automatic printing plate feed system is known as PPL (Power Plate Loading) from MAN Roland Druckmaschinen AG and is used on R 700 series machines. In this device shown in DE magazine Druckwelt 4 / 25.02.1993, page 24ff, and also described in the unpublished DE patent application P 42 15 969, the printer only has to remove one printing plate and one from the plate cylinder through a slot in the slide protection Feed the new pressure plate to the plate cylinder. By doing For this purpose, pneumatically movable sliding protection is provided with a guide device which is pivotably mounted and removable with respect to the plate cylinder. The remotely controlled clamping, unclamping and the corresponding positioning processes of the plate cylinder are triggered by the printer via operating elements.

Aufgabe der vorliegenden Erfindung ist es somit, ein Verfahren sowie eine Vorrichtung gemäß dem entsprechenden Oberbegriff derartig weiterzubilden, so daß sich im Falle eines halbautomatischen Druckplattenwechselvorganges eine möglichst geringe Anzahl von durch den Drucker an Bedienelementen einzugebenden Kommandos ergibt und sich ferner bei einem vollautomatischen Druckplattenwechselvorgang eine erhöhte Störsicherheit ergibt.The object of the present invention is therefore to further develop a method and a device in accordance with the corresponding preamble in such a way that, in the case of a semi-automatic printing plate change process, the number of commands to be entered by the printer on operating elements is as small as possible and, furthermore, there is an increase in a fully automatic printing plate change process Interference immunity results.

Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale von Anspruch 1 bzw. 6. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.This object is achieved by the characterizing features of claims 1 and 6 respectively. Further developments of the invention result from the subclaims.

Gemäß der Erfindung ist vorgesehen, daß die insbesondere elektrisch abfragbaren Registerstifte nicht nur dazu verwendet werden, festzustellen, ob eine neu zuzuführende Druckplatte registergerecht in der Druckanfang-Spannschiene eingelegt wurde, woraufhin der Klemmvorgang eingeleitet wird. Es erfolgt gemäß der Erfindung zusätzlich eine Abfrage der Registerstifte, um festzustellen, ob die gebrauchte Druckplatte aus der Druckanfang-Spannschiene (Klemmung gelöst) herausgenommen wurde.According to the invention, it is provided that the register pins, which can in particular be interrogated electrically, are not only used to determine whether a new printing plate to be fed has been inserted in the printing start tensioning rail in register, whereupon the clamping process is initiated. According to the invention, the register pins are also queried to determine whether the used printing plate has been removed from the pressure start clamping rail (clamping released).

Nach einer weiteren bevorzugten Ausbildung der Erfindung ist vorgesehen, daß die insbesondere elektrisch abfragbaren Registerstifte ferner dazu benutzt werden, nicht nur festzustellen, ob die gebrauchte Druckplatte aus der geöffneten Druckanfang-Spannschiene herausgenommen wurde und auch ferner eine neu eingelegte Druckplatte registergerecht anliegt (Spannschiene offen). Dazu ist vorgesehen, nachdem die Druckplatte als korrekt an den Registerstiften anliegend festgestellt wurde (Spannschiene offen) eben den Klemmvorgang einzuleiten und danach eine nochmalige Abfrage der Registerstifte vorzunehmen. Durch diese nochmalige Abfrage kann festgestellt werden, ob sich durch das Klemmen der Druckplatte eine evtl. Lageverschiebung ergeben hat.According to a further preferred embodiment of the invention, it is provided that the register pins, which can in particular be interrogated electrically, are also used not only to determine whether the used printing plate has been removed from the opened pressure start clamping rail and also whether a newly inserted printing plate is in register (clamping rail open) . For this purpose, after the pressure plate has been found to be correctly seated on the register pins (clamping rail open), the clamping process is provided and then check the register pins again. This repeated query can be used to determine whether there is a possible shift in position due to the clamping of the pressure plate.

Als erfindungsgemäße Weiterbildung kann ferner vorgesehen sein, daß die insbesondere elektrisch abfragbaren Registerstifte getrennt abgefragt werden, d.h. es ist feststellbar und auch durch entsprechende Leuchtdioden oder auch akustisch signalisierbar, ob die Druckplatte entweder am Registerstift der Antriebs- oder Bedienseite nicht korrekt anliegt.As a further development according to the invention, it can further be provided that the register pins, which can in particular be interrogated electrically, are interrogated separately, i.e. it can be determined and can also be signaled acoustically by means of corresponding light-emitting diodes or whether the pressure plate is not correctly in contact with either the register pin on the drive or operating side.

Des weiteren erfolgt die Erläuterung eines Ausführungsbeispiels der Erfindung anhand der einzigen Figur. Diese zeigt auf die wesentlichsten Schritte der Ablaufsteuerung eines Druckplattenwechselvorgangs.Furthermore, an embodiment of the invention is explained with reference to the single figure. This shows the most important steps in the sequence control of a printing plate change process.

An einem Druckwerk oder zentral an einem Leitstand wurde das Kommando Plattenwechsel eingegeben (Start), was durch Betätigung eines entsprechenden Befehlstasters erfolgt.The plate change command was entered (start) on a printing unit or centrally at a control center, which is done by pressing a corresponding command button.

Daraufhin erfolgen einige hier im Diagramm nicht dargestellte Sicherheitsabfragen, insbesondere ob Schutze geschlossen usw.. Auch erfolgt ein Sperren der Maschinensteuerung gegen bestimmte Kommandos, z.B. daß die Druckmaschine nun nicht mehr von einem anderen Druckwerk oder sonstiger Stelle aus angesteuert werden kann.This is followed by some safety queries, not shown here in the diagram, in particular whether protective devices are closed, etc. The machine control is also locked against certain commands, e.g. that the printing machine can no longer be controlled from another printing unit or other location.

Der Plattenzylinder wird sodann in eine bestimmte Winkelstellung positioniert, was durch Anfahren in Vorwärts- oder Rückwärtsrichtung erfolgt. Durch Ansteuern der entsprechenden Stellmittel wird die Spannung und die Klemmung an der Druckende-Spannschiene (DE) gelöst.The plate cylinder is then positioned in a certain angular position, which is done by moving forward or backward. The tension and the clamping on the pressure end tensioning rail (DE) are released by activating the appropriate actuating means.

Durch langsames Rückwärtsdrehen des Plattenzylinders bis in eine bestimmte Winkelposition wird nun die gebrauchte Druckplatte mit ihrer Hinterkante voran beispielsweise in einen automatischen Druckplattenwechsler oder in eine manuell zu entsorgende Aufnahmevorrichtung hineingefördert. Das Positionieren des Plattenzylinders erfolgt dabei insbesondere in diejenige Winkelposition, welche auch zum Einführen der Vorderkante einer neu zuzuführenden Druckplatte in die entsprechende Druckanfang-Spannschiene (DA) dient. In dem rein prinzipiell zu verstehenden Diagramm der Figur sind dabei evtl. auszulösende An- bzw. Abstellvorgänge von Andrückwalzen oder eines Druckplattenmagazins nicht wiedergegeben.By slowly turning the plate cylinder backwards into a certain angular position, the used pressure plate is now included conveyed in front of its rear edge, for example, into an automatic printing plate changer or into a receiving device to be disposed of manually. The positioning of the plate cylinder takes place in particular in the angular position which also serves to insert the front edge of a new printing plate to be fed into the corresponding pressure start clamping rail (DA). In the diagram of the figure, which is to be understood in principle, any activation or deactivation processes of pressure rollers or a printing plate magazine that may be triggered are not shown.

Nachdem der Plattenzylinder durch Rückwärtsdrehen die vorgesehene Winkelposition eingenommen hat erfolgt ein Öffnen der Druckanfang-Spannschiene (DA). Es wird also die Klemmung gelöst. Sodann erfolgt eine Abfrage der im Plattenzylinder und in der dortigen Druckanfang-Spannschiene angebrachten Registerstifte. Es wird dadurch festgestellt, ob die Druckplatte noch an beiden Registerstiften anliegt.After the plate cylinder has reached the intended angular position by turning it backwards, the pressure start clamping rail (DA) is opened. So the clamping is released. Then there is an interrogation of the register pins attached in the plate cylinder and in the pressure start clamping rail there. This determines whether the pressure plate is still in contact with both register pins.

Ist dies der Fall (Registerstifte aus? - nein) so wird durch ständige Weiterabfrage der programmierte Ablauf an dieser Stelle unterbrochen (Warteschleife). Insbesondere ist vorgesehen, daß diese Abfrage über ein vorgegebenes Intervall beispielsweise eine Sekunde (1S), durchgeführt wird, d.h. nur wenn beide Registerstifte mindestens dieses Zeitintervall keinen Kontakt zur Druckplatte erhalten erfolgt der weitere Ablauf des Programmes (Registerstifte aus? - ja).If this is the case (register pins off? - no), the programmed sequence is interrupted at this point by a continuous query (waiting loop). In particular, it is provided that this query is carried out over a predetermined interval, for example one second (1S), i.e. the program continues to run only if both register pins have no contact with the printing plate for at least this time interval (register pins off? - yes).

Durch die zuletzt beschriebene Abfrage, ob die Registerstifte inaktiv sind, d.h. nicht von der Druckplatte berührt werden, wird festgestellt, ob die Druckplatte herausgefördert bzw. manuell entnommen wurde. Wegen ihrem Eigengewicht wird die Druckplatte bei geöffneter Druckanfang-Spannschiene in jedem Fall an einem der Registerstifte anliegen, solange sie nicht zum Herausnehmen ergriffen wird. Dies ist dem prinzipiellen Ablaufdiagramm durch die gestrichelte Umrandung des entsprechenden Schrittes dargestellt (Druckplatte aus DA-Schiene). Es kommt dabei allerdings nicht darauf an, ob die Druckplatte manuell aus der Druckanfang-Spannschiene (DA) herausgezogen oder durch entsprechend aktivierte Fördermittel abgefördert wird.The last-described query as to whether the register pins are inactive, ie not being touched by the printing plate, determines whether the printing plate has been removed or removed manually. Because of its own weight, the pressure plate will in any case lie against one of the register pins when the pressure start clamping rail is open, as long as it is not grasped for removal. This is shown in the basic flowchart by the dashed outline of the corresponding step (pressure plate from DA rail). However, it does not matter whether the The printing plate is manually pulled out of the pressure start clamping rail (DA) or removed using appropriately activated funding.

Wurde durch die zuletzt beschriebene Abfrage der Registerstifte festgestellt, daß eine alte Druckplatte entfernt wurde, so erfolgt eine weitere Abfrage, ob eine neue Druckplatte registergerecht in die Druckanfang-Spannschiene (DA) eingeführt wurde (neue Platte in DA-Schiene). Wiederum ist vorgesehen, daß dies ein bestimmtes Zeitintervall, z.B. 1 Sekunde lang der Fall sein muß (Registerstifte ein?), was als Indiz dafür gewertet wird, daß die Druckplatte korrekt anliegt. Wird das vorgesehene Kriterium nicht erfüllt (nein), so wird die Abfrage solange wiederholt, bis dies der Fall ist. Wird dieses Kriterium erfüllt (ja), so erfolgt in einem nächsten Programmschritt das Schließen der Druckanfang-Spannschiene (DA). Die Druckplatte ist somit an ihrer Vorderkante geklemmt.If it was determined from the last query of the register pins that an old printing plate has been removed, a further query is made as to whether a new printing plate has been inserted into the print start clamping rail (DA) according to the register (new plate in the DA rail). Again it is envisaged that this is a certain time interval, e.g. For 1 second (register pins on?), Which is taken as an indication that the printing plate is correctly fitted. If the intended criterion is not met (no), the query is repeated until this is the case. If this criterion is met (yes), the pressure start clamping rail (DA) is closed in a next program step. The pressure plate is thus clamped on its front edge.

Nun erfolgt eine nochmalige Abfrage der Registerstifte (Registerstifte ein?). Es wird somit festgestellt, ob die Druckplatte auch nach dem Klemmvorgang korrekt an den Registerstiften anliegt. Ist dies nicht der Fall (nein), so erfolgt ein Rücksprung bis an diejenige Stelle des Programmablaufes, der dem Öffnen der Druckanfang-Spannschiene (DA) bewirkt. Es wird also die Druckanfang-Spannschiene geöffnet und die Druckplatte muß nocheinmal aus dem Bereich der Registerstifte entfernt und sodann korrekt angelegt werden.Now the register pins are queried again (register pins on?). It is thus determined whether the pressure plate is correctly in contact with the register pins even after the clamping process. If this is not the case (no), there is a jump back to the point in the program sequence that causes the opening of the pressure start clamping rail (DA). The pressure start clamping rail is therefore opened and the pressure plate must be removed again from the area of the register pins and then correctly applied.

Wurde nach dem Klemmen eine registergerechte Lage der Druckplatte festgestellt (ja), so erfolgt das Aufziehen der Druckplatte durch entsprechendes Vorwärtsdrehen des Plattenzylinders, daraufhin das Einführen des Druckendes (DE) der Druckplatte in die entsprechende Spannschiene, das Klemmen, sowie das Spannen der Druckplatte. Ebenfalls erfolgt das Abstellen evtl. während des Aufziehvorganges an den Plattenzylinder angestellter Einrichtungen. Nachdem sämtliche vorgesehenen Aktionen ausgeführt wurden, ist der Druckplattenwechsel beendet (Ende).If a correct position of the pressure plate has been determined after clamping (yes), the pressure plate is pulled open by turning the plate cylinder forward accordingly, then inserting the pressure end (DE) of the pressure plate into the corresponding tensioning rail, clamping and tensioning the pressure plate. Shutdown may also take place during the mounting process of devices attached to the plate cylinder. After all the specified actions have been carried out, the printing plate change has ended (end).

Beschrieben wurde voranstehend ein Plattenwechsel an einem Druckwerk. Bei den weiteren Druckwerken wird entsprechend verfahren. Es kann vorgesehen sein, daß die Bedienperson an jedem Druckwerk den Wechselvorgang über einen oder mehrere Taster auslöst - wie ersichtlich, sind während des Wechselvorganges an einem Druckwerk keine weiteren Kommandos nötig.A plate change on a printing unit has been described above. The same procedure is followed for the other printing units. It can be provided that the operator triggers the change process on each printing unit via one or more buttons - as can be seen, no further commands are necessary during the changing process on a printing unit.

Sehr vorteilhaft gestaltet sich jedoch die Verfahrensweise der Erfindung, wenn bei einer Mehrfarbenmaschine, da lediglich nur einmal das Kommando "Plattenwechsel" gegeben werden muß (erstes Druckwerk oder Leitstand) und die Steuerung dabei so programmiert ist, daß nach dem Ende des Plattenwechsels im ersten Druckwerk sofort die entsprechende Vorgänge und das Positionieren des Plattenzylinders im folgenden Druckwerk eingeleitet werden. Wegen der erfindungsgemäßen Abfrage wird der Steuerablauf dort solange unterbrochen, bis die neue Platte zugeführt wurde. Für die weiteren Druckwerke ergibt sich entsprechendes.However, the procedure of the invention is very advantageous if, in the case of a multicolour machine, since the command "plate change" only has to be given once (first printing unit or control station) and the control system is programmed such that after the end of the plate change in the first printing unit the corresponding processes and the positioning of the plate cylinder are immediately initiated in the following printing unit. Because of the query according to the invention, the control sequence is interrupted until the new plate has been fed. The same applies to the other printing units.

Claims (9)

Verfahren zum Steuern eines automatisierten Druckplattenwechselvorganges bei einer Druckmaschine, insbesondere Bogenoffsetdruckmaschine, bei dem eine gebrauchte Druckplatte aus dem geöffenten Erfassungsbereich einer dem Druckanfang des Plattenzylinders zugeordneten Spannschiene entfernt und daraufhin eine neue Druckplatte mit ihrer Vorderkante in den geöffneten Erfassungsbereich eingeführt wird, wobei vor dem Schließen (Klemmen) des Erfassungsbereiches festgestellt wird, ob die Vorderkante der Druckplatte eine registergerechte Position bezüglich dem Plattenzylinder einnimmt,
dadurch gekennzeichnet,
daß vor der Feststellung, ob eine neue Druckplatte in den geöffneten Erfassungsbereich eingeführt, ob die Druckplatte eine registergerechte Position einnimmt und vor dem Schließen (Klemmen) des Erfassungsbereiches festgestellt wird, ob eine gebrauchte Druckplatte mit ihrer Vorderkante die registergerechte Position nicht einnimmt und daß die nachfolgend vorgesehenen Verfahrensschritte nur dann ausgeführt werden, wenn diese Bedingung erfüllt ist.
Method for controlling an automated printing plate change process in a printing press, in particular sheet-fed offset printing press, in which a used printing plate is removed from the open detection area of a tensioning rail assigned to the start of printing of the plate cylinder and then a new printing plate is inserted with its front edge into the opened detection area, before closing ( Clamping) of the detection area is determined whether the front edge of the printing plate is in a register-correct position with respect to the plate cylinder,
characterized by
that before determining whether a new printing plate is inserted into the opened detection area, whether the printing plate is in a register-correct position and before closing (clamping) the detection area, it is determined whether a used printing plate with its leading edge is not in the registering position and that the following provided procedural steps are only carried out if this condition is met.
Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Feststellung, ob die Vorderkante der Druckplatte eine registergerechte Position einnimmt bzw. nicht einnimmt an zwei axial voneinander beabstandeten Punkten des Plattenzylinders durchgeführt wird.
Method according to claim 1,
characterized by
that the determination as to whether or not the front edge of the printing plate assumes a register-correct position is carried out at two axially spaced apart points of the plate cylinder.
Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Feststellung, ob die Vorderkante der Druckplatte eine registergerechte Position einnimmt bzw. nicht einnimmt innerhalb eines bestimmten Zeitintervalls durchgeführt wird.
The method of claim 1 or 2,
characterized by
that the determination as to whether the leading edge of the printing plate assumes a register-correct position or not takes place within a certain time interval.
Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß nach dem Schließen des Erfassungsbereiches der dem Druckanfang des Plattenzylinders zugeordneten Spannschiene eine weitere Feststellung erfolgt, ob die neue Druckplatte eine registergerechte Position einnimmt und bei nicht erfüllen dieser Bedingung ein Öffnen des Erfassungsbereiches erfolgt.
Method according to one of the preceding claims,
characterized by
that after the detection area of the clamping rail assigned to the start of printing of the plate cylinder has been closed, a further determination is made as to whether the new printing plate is in a register-correct position and, if this condition is not met, the detection area is opened.
Verfahren wenigstens nach Anspruch 1 und 2,
dadurch gekennzeichnet,
daß die Feststellung, ob die Vorderkante der Druckplatte eine registergerechte Position an den zwei axial voneinander beabstandeten Stellen unabhängig voneinander durchgeführt wird.
Method at least according to claims 1 and 2,
characterized by
that the determination of whether the leading edge of the pressure plate is carried out in a register-correct position at the two axially spaced locations independently of one another.
Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 bis 5, mit einer Steuerung, die in Wirkverbindung mit den das Öffnen und Schließen des Erfassungsbereiches der dem Druckanfang des Plattenzylinders zugeordneten Spannschiene steht und ferner mit einer Lageerkennungseinrichtung verbunden ist, die mit der Vorderkante der Druckplatte zusammenwirkt,
dadurch gekennzeichnet,
daß durch die Steuerung über die Stellmittel der Erfassungsbereich solange in der geöffneten Stellung gehalten wird, bis wenigstens einmal feststellbar ist, daß die gebrauchte Druckplatte mit ihrer Vorderkante nicht von der Lageerkennungseinrichtung erfaßt wird.
Apparatus for carrying out the method according to claims 1 to 5, having a control which is in operative connection with the opening and closing of the detection area of the tensioning rail assigned to the start of printing of the plate cylinder and is also connected to a position detection device which cooperates with the front edge of the printing plate,
characterized by
that the detection area is kept in the open position by the control via the adjusting means until it can be ascertained at least once that the used pressure plate is not detected by the position detection device with its front edge.
Vorrichtung nach Anspruch 6,
dadurch gekennzeichnet,
daß die Steuerung mit zwei axial voneinander beabstandet und in der dem Druckanfang des Plattenzylinders zugeordneten Spannschiene angebrachten, elektrisch abfragbaren Registerstiften in Wirkverbindung steht.
Apparatus according to claim 6,
characterized by
that the control is in operative connection with two axially spaced apart and in the tension rail associated with the start of the plate cylinder associated, electrically interrogable register pins.
Vorrichtung nach Anspruch 6 oder 7,
dadurch gekennzeichnet,
daß die in der Spannschiene angeordneten, elektrisch abfragbaren Registerstifte einzel mit der Steuerung verbunden sind.
Apparatus according to claim 6 or 7,
characterized by
that the electrically interrogated register pins arranged in the tensioning rail are individually connected to the control.
Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet,
daß zwei Anzeigemittel vorgesehen sind, durch welche über die Steuerung darstellbar ist, an welchem Registerstift die Druckplatte anliegt oder nicht.
Device according to claim 8,
characterized by
that two display means are provided, by means of which the control can be used to show which register pin the pressure plate is or is not.
EP94116680A 1993-11-12 1994-10-22 Method and device for controlling the automatic plate exchange process in printing machines Expired - Lifetime EP0653301B1 (en)

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DE4338664A DE4338664C2 (en) 1993-11-12 1993-11-12 Method and device for controlling an automated printing plate changing process in printing machines

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JPH07186370A (en) 1995-07-25
DE4338664C2 (en) 1995-09-14
US5479859A (en) 1996-01-02
DE59401466D1 (en) 1997-02-13
DE4338664A1 (en) 1995-05-18
EP0653301B1 (en) 1997-01-02
ATE147011T1 (en) 1997-01-15
JP2948114B2 (en) 1999-09-13

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