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EP0005435B1 - Method for producing multi-colour prints with exact colour registration - Google Patents

Method for producing multi-colour prints with exact colour registration Download PDF

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Publication number
EP0005435B1
EP0005435B1 EP79100765A EP79100765A EP0005435B1 EP 0005435 B1 EP0005435 B1 EP 0005435B1 EP 79100765 A EP79100765 A EP 79100765A EP 79100765 A EP79100765 A EP 79100765A EP 0005435 B1 EP0005435 B1 EP 0005435B1
Authority
EP
European Patent Office
Prior art keywords
sheet
grippers
gripper
group
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79100765A
Other languages
German (de)
French (fr)
Other versions
EP0005435A1 (en
Inventor
Druckmaschinen Aktiengesellschaft Heidelberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0005435A1 publication Critical patent/EP0005435A1/en
Application granted granted Critical
Publication of EP0005435B1 publication Critical patent/EP0005435B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers

Definitions

  • the invention relates to a method for achieving register-accurate multi-color printing with a sheet-fed rotary offset printing machine, in which the sheet is transferred from a gripper bridge with a rigidly designed gripper bar of a cylinder to a corresponding gripper bridge of a subsequent cylinder.
  • correction devices which deform the leading edge of the sheet in or against the direction of sheet travel after printing.
  • AT-B-303766 shows a sheet transfer drum whose central gripper bridge area is adjustable in the circumferential direction, while the outer areas of the gripper bridge are rigidly arranged. When the middle gripper bridge area is adjusted, the outer grippers of the non-adjustable gripper bridge areas are closed, but the inside grippers are opened so that the front edge of the sheet can be deformed without distortion.
  • These known correction devices are very complex and only serve to correct an already occurring tight printing. A tension is imposed on the bow.
  • the object of the invention is to remove or reduce the tensions in the sheet leading edge area after the sheet transfer, but before the next start of printing.
  • the brief opening and closing of all or some of the grippers gives the leading edge of the sheet sufficient freedom for the desired relaxation. Since the sheet is wrapped around the cylinder, there is a tendency to straighten the leading edge anyway due to the curvature in the area of the sheet leading edge. This leveling force helps to relax the leading edge of the sheet as soon as it is released by some or all of the grippers.
  • This guide member can consist of two or more rollers which act, for example, on the sheet transported by the respective cylinder.
  • the gripper bridge consists of two gripper groups that are controlled separately from each other, each of these gripper groups must be assigned a special control curve.
  • the two gripper groups are then preferably opened and closed once or twice in succession, that is to say alternately. This alternating opening and closing enables a very effective relaxation of the leading edge of the sheet.
  • the gripper 1 shown in FIG. 1 of a gripper bridge 2 of a pressure cylinder 3 is fastened on a gripper housing which is rotatably mounted on the gripper shaft 5.
  • a stop block 6 is fixedly attached to the gripper shaft 5 and connected to the gripper housing via a compression spring 7.
  • the compression spring 7 constantly presses the gripper 1 in the direction of the gripper bar 8.
  • a set screw 10 is screwed into a partition 9 of the stop block 6, the screw end 11 of which interacts with a stop surface 12 of the gripper housing when the gripper 1 is lifted off the gripper bar 8.
  • the distance 13 between the screw end 11 and the stop surface 12 is adjustable and determines the point in time at which the respective gripper 1 is lifted off the gripper bar 8.
  • the distance 13 can be carried out differently in the individual grippers 1, so for the purpose of relaxing the previously detected sheet leading edge with a corresponding one Design of the gripper shaft control curve 14, see FIG. 2, only lift off a few grippers 1, but not yet the others with a somewhat greater distance 13.
  • this configuration consists in a recess 15 of the gripper shaft control curve 14, while in the case of a not necessarily forcibly closing gripper system the gripper shaft control curve 14 has an elevation 16. This measure makes it possible, in a simple and inexpensive manner, to relax a sheet, for example taken from a printing cylinder 3.
  • the cam roller 17 of the gripper shaft 5 reaches the aforementioned small recess 15 or the elevation 16 of the gripper shaft control curve 14 and causes all those grippers 1 to be lifted off the gripper bar 8, which have a small distance 13, while the remaining grippers 1 with the larger distance 13 continue to hold the bow due to the compressive stress of the compression spring 7 in cooperation with the gripper bar 8.
  • the lifting and closing of the first group of grippers 1 must be completed before printing begins.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Erzielung passergenauer Mehrfarbendrucke mit einer Bogen-Rotationsoffsetdruckmaschine, bei der der Bogen von einer Greiferbrücke mit durchgehend starr ausgebildeter Greiferaufschlagleiste eines Zylinders an eine entsprechende Greiferbrücke eines nachfolgenden Zylinders übergeben wird.The invention relates to a method for achieving register-accurate multi-color printing with a sheet-fed rotary offset printing machine, in which the sheet is transferred from a gripper bridge with a rigidly designed gripper bar of a cylinder to a corresponding gripper bridge of a subsequent cylinder.

Beim Mehrfarbendruck tritt aufgrund fehlerhafter Bogenübernahme und Bogenübergabe nicht selten eine Minderung der Druckqualität auf. Insbesondere sind solche Schwierigkeiten bei verspanntem, nicht planliegendem Papier zu erwarten. Als Mängel wurden festgestellt: Faltenbildung des Bogens, Engerdrucken bei Mehrfarbendruck oder Paßdifferenzen, die von Druckwerk zu Druckwerk bzw. bei zweimaligem Durchgang durch die Maschine entstehen. Eine Ursache von Qualitätsminderung der Drucke ist auch bei planliegendem Bogen darin zu suchen, daß dieser geringfügig faltig übernommen wird, oder daß bei einer Greiferübergabe mit seitlich nahe nebeneinanderliegenden Greifern von einem ersten zu einem zweiten Zylinder Wellenbildung entsteht. Eine in dieser Weise fehlerhafte Bogenübergabe bewirkt Spannungen im Bogenvorderkantenbereich, die wiederum eine Veränderung des Bogens während des nachfolgenden Drucks auslösen, was dann z. B. die erwähnten Druckbildfehler nach sich zieht.In multi-color printing, the print quality is often reduced due to incorrect sheet transfer and transfer. In particular, such difficulties are to be expected with tensioned, not flat paper. The following were found to be deficiencies: fold formation of the sheet, narrow printing in the case of multicolor printing or passport differences which arise from printing unit to printing unit or in the case of two passes through the machine. One reason for a reduction in the quality of the prints is to be found in the fact that the sheet is lying flat in that it is taken over slightly wrinkled, or that when a gripper is handed over with grippers lying side by side from one another, wave formation occurs from a first to a second cylinder. A faulty sheet transfer in this way causes tension in the sheet leading edge area, which in turn triggers a change in the sheet during the subsequent printing. B. results in the mentioned print image errors.

Zur Behebung solcher Druckfehler sind Korrekturvorrichtungen bekannt, die nach dem Druck die Bogenvorderkante in oder entgegen Bogenlaufrichtung deformieren. Beispielsweise zeigt die AT-B-303766 eine Bogenübergabetrommel, deren mittlerer Greiferbrückenbereich in Umfangsrichtung verstellbar ist, während die äußeren Bereiche der Greiferbrücke starr angeordnet sind. Beim Verstellen des mittleren Greiferbrückenbereichs sind die äußeren Greifer der nicht verstellbaren Greiferbrückenbereiche geschlossen, die innen liegenden Greifer jedoch geöffnet, damit die Bogenvorderkante verzerrungsfrei deformiert werden kann. Diese bekannten Korrekturvorrichtungen sind sehr aufwendig und dienen lediglich dazu, ein bereits eingetretenes Engerdrucken zu korrigieren. Dabei wird dem Bogen eine Spannung aufgezwungen.To correct such printing errors, correction devices are known which deform the leading edge of the sheet in or against the direction of sheet travel after printing. For example, AT-B-303766 shows a sheet transfer drum whose central gripper bridge area is adjustable in the circumferential direction, while the outer areas of the gripper bridge are rigidly arranged. When the middle gripper bridge area is adjusted, the outer grippers of the non-adjustable gripper bridge areas are closed, but the inside grippers are opened so that the front edge of the sheet can be deformed without distortion. These known correction devices are very complex and only serve to correct an already occurring tight printing. A tension is imposed on the bow.

Die Aufgabe der Erfindung besteht darin, nach der Bogenübergabe, jedoch vor dem nächsten Druckbeginn die Spannungen im Bogenvorderkantenbereich zu beseitigen bzw. zu reduzieren.The object of the invention is to remove or reduce the tensions in the sheet leading edge area after the sheet transfer, but before the next start of printing.

Gelöst wird die Aufgabe durch die kennzeichnenden Merkmale der Ansprüche 1 und 4.The object is achieved by the characterizing features of claims 1 and 4.

Das kurzzeitige Öffnen und Schließen aller oder einiger Greifer gibt der Bogenvorderkante hinreichend Freiheit für die angestrebte Entspannung. Da der Bogen um den Zylinder gewickelt wird, herrscht aufgrund der Bogenkrümmung im Bogenvorderkantenbereich ohnehin das Bestreben, die Vorderkante gerade zu richten. Diese Ausrichtekraft unterstützt das Entspannen der Bogenvorderkante,sobald sie von einigen oder allen Greifern freigegeben wird.The brief opening and closing of all or some of the grippers gives the leading edge of the sheet sufficient freedom for the desired relaxation. Since the sheet is wrapped around the cylinder, there is a tendency to straighten the leading edge anyway due to the curvature in the area of the sheet leading edge. This leveling force helps to relax the leading edge of the sheet as soon as it is released by some or all of the grippers.

Werden alle Greifer der Greiferbrücke geöffnet, so muß ein zusätzliches Führungsglied vorgesehen sein, damit die Paßgenauigkeit des Bogens erhalten bleibt. Dieses Führungsglied kann aus zwei oder mehreren Rollen bestehen, die beispielsweise auf den von dem jeweiligen Zylinder transportierten Bogen einwirken.If all grippers of the gripper bridge are opened, an additional guide element must be provided so that the accuracy of fit of the bow is maintained. This guide member can consist of two or more rollers which act, for example, on the sheet transported by the respective cylinder.

Es ist auch denkbar, zwei oder vier Greifer geschlossen zu lassen und die Entspannung durch das Öffnen der übrigen Greifer zu bewirken. Versuche haben sogar ergeben, daß vielfach das Öffnen nur jedes zweiten Greifers eine hinreichende Entspannung der Bogenvorderkante ermöglicht.It is also conceivable to leave two or four grippers closed and to effect relaxation by opening the other grippers. Tests have even shown that in many cases opening only every second gripper enables sufficient relaxation of the leading edge of the sheet.

Für die besagte Entspannung des Bogens durch Öffnen der Greifer braucht lediglich die Greiferöffnungskurve entsprechend ausgebildet werden. Besteht die Greiferbrücke aus zwei voneinander gesondert gesteuerten Greifergruppen, so muß jeder dieser Greifergruppen eine besondere Steuerkurve zugeordnet werden. Vorzugsweise werden dann die beiden Greifergruppen nacheinander, also im Wechsel, ein- oder zweimal geöffnet und geschlossen. Dies wechselweise Öffnen und Schließen ermöglicht eine sehr wirksame Entspannung der Bogenvorderkante.For the said relaxation of the arc by opening the grippers, only the gripper opening curve needs to be designed accordingly. If the gripper bridge consists of two gripper groups that are controlled separately from each other, each of these gripper groups must be assigned a special control curve. The two gripper groups are then preferably opened and closed once or twice in succession, that is to say alternately. This alternating opening and closing enables a very effective relaxation of the leading edge of the sheet.

Eine auffallend einfache Ausführungsform der Erfindung wird nachfolgend anhand der Zeichnung erläutert. Es zeigt

  • Fig. 1 einen Schnitt durch eine schematisch dargestellte Greiferbrücke nach der Erfindung und
  • Fig. 2 und 3 einen Schnitt durch eine ähnliche Greiferbrücke im Bereich ihrer Steuermittel.
A strikingly simple embodiment of the invention is explained below with reference to the drawing. It shows
  • Fig. 1 shows a section through a schematically illustrated gripper bridge according to the invention and
  • 2 and 3 a section through a similar gripper bridge in the area of their control means.

Der in der Fig. 1 dargestellte Greifer 1 einer Greiferbrücke 2 eines Druckzylinders 3 ist auf einem Greifergehäuse befestigt, das drehbar auf der Greiferwelle 5 gelagert ist. Ein Anschlagbock 6 ist auf der Greiferwelle 5 fest angebracht und über eine Druckfeder 7 mit dem Greifergehäuse verbunden. Die Druckfeder 7 drückt den Greifer 1 ständig in Richtung auf die Greiferaufschlagleiste 8.The gripper 1 shown in FIG. 1 of a gripper bridge 2 of a pressure cylinder 3 is fastened on a gripper housing which is rotatably mounted on the gripper shaft 5. A stop block 6 is fixedly attached to the gripper shaft 5 and connected to the gripper housing via a compression spring 7. The compression spring 7 constantly presses the gripper 1 in the direction of the gripper bar 8.

In eine Stellwand 9 des Anschlagbocks 6 ist eine Stellschraube 10 geschraubt, deren Schraubenende 11 mit einer Anschlagfläche 12 des Greifergehäuses zusammenwirkt, wenn der Greifer 1 von der Greiferaufschlagleiste 8 abgehoben wird. Der Abstand 13 zwischen dem Schraubenende 11 und der Anschlagfläche 12 ist einstellbar und bestimmt den Zeitpunkt, wann der jeweilige Greifer 1 von der Greiferaufschlagleiste 8 abgehoben wird.A set screw 10 is screwed into a partition 9 of the stop block 6, the screw end 11 of which interacts with a stop surface 12 of the gripper housing when the gripper 1 is lifted off the gripper bar 8. The distance 13 between the screw end 11 and the stop surface 12 is adjustable and determines the point in time at which the respective gripper 1 is lifted off the gripper bar 8.

Der Abstand 13 kann bei den einzelnen Greifern 1 unterschiedlich ausgeführt werden, damit zum Zwecke der Entspannung der zuvor erfaßten Bogenvorderkante bei entsprechender Ausgestaltung der Greiferwellensteuerkurve 14, siehe Fig. 2, nur einige Greifer 1 abheben, die anderen mit einem etwas größeren Abstand 13 jedoch noch nicht. Diese Ausgestaltung besteht bei einem zwangsweise schließenden Greifersystem in einer Ausnehmung 15 der Greiferwellensteuerkurve 14, während bei einem nicht zwangsweise schließenden Greifersystem die Greiferwellensteuerkurve 14 eine Erhöhung 16 aufweist. Durch diese Maßnahme ist es möglich, auf einfache und billige Weise die Entspannung eines beispielsweise von einem Druckzylinder 3 übernommenen Bogens zu bewirken. Ist nämlich der nicht dargestellte Bogen von der Greiferbrücke 2 des Druckzylinders 3 übernommen worden, so erreicht die Kurvenrolle 17 der Greiferwelle 5 die obenerwähnte geringe Ausnehmung 15 bzw. die Erhöhung 16 der Greiferwellensteuerkurve 14 und bewirkt das Abheben aller jener Greifer 1 von der Greiferaufschlagleiste 8, die einen geringen Abstand 13 aufweisen, während die übrigen Greifer 1 mit dem größeren Abstand 13 weiterhin aufgrund der Druckspannung der Druckfeder 7 im Zusammenwirken mit der Greiferaufschlagleiste 8 den Bogen festhalten. Das Abheben und wieder Schließen der erstgenannten Gruppe von Greifern 1 muß vor Druckbeginn beendet sein.The distance 13 can be carried out differently in the individual grippers 1, so for the purpose of relaxing the previously detected sheet leading edge with a corresponding one Design of the gripper shaft control curve 14, see FIG. 2, only lift off a few grippers 1, but not yet the others with a somewhat greater distance 13. In the case of a forcibly closing gripper system, this configuration consists in a recess 15 of the gripper shaft control curve 14, while in the case of a not necessarily forcibly closing gripper system the gripper shaft control curve 14 has an elevation 16. This measure makes it possible, in a simple and inexpensive manner, to relax a sheet, for example taken from a printing cylinder 3. If the bow, not shown, has been taken over by the gripper bridge 2 of the pressure cylinder 3, the cam roller 17 of the gripper shaft 5 reaches the aforementioned small recess 15 or the elevation 16 of the gripper shaft control curve 14 and causes all those grippers 1 to be lifted off the gripper bar 8, which have a small distance 13, while the remaining grippers 1 with the larger distance 13 continue to hold the bow due to the compressive stress of the compression spring 7 in cooperation with the gripper bar 8. The lifting and closing of the first group of grippers 1 must be completed before printing begins.

Claims (4)

1. A method for producing in-register multi-color prints on a sheet-feed offset printing press, in which the sheet is transferred from a group (2) of grippers having a gripper pad rail (8) which is stiff along its full length, of one cylinder to a further group (2) of grippers of a cylinder coming thereafter, characterized in that after take-up of the sheet but before the start of printing or before the transfer of the next sheet some, but not all, of the grippers (1) of the group (2) of grippers gripping the sheet are opened for a short time so that pulling forces acting on the edge of the sheet because of sheet-waviness are put an end to or decreased automatically without the use of any further system.
2. A method as claimed in claim 1, characterized in that there is a division of the group (2) of grippers into two sorts of separately moved grippers, whose operation is such that two sorts of grippers are opened and shut in turn.
3. A method as claimed in claim 1, characterized in that each second gripper (1) is opened.
4. A method for producing in-register multi-color prints on a sheet-feed offset printing press in which the sheet is transferred from a proup (2) of grippers having a gripper pad rail (8) which is stiff along its full length, of one cylinder to a further group of grippers of a cylinder coming thereafter, characterized in that after sheet take-over but before the start of printing or before the transfer of the next sheet, all grippers (1) of the group (2) of grippers are opened for a short time and shut again so that pulling forces acting on the edge of the sheet because of sheet-waviness are put an end to or decreased automatically without the use of any further system and in that in this said time the sheet is guided by a guide part working with the cylinder (3) of the group (2) of grippers.
EP79100765A 1978-05-11 1979-03-14 Method for producing multi-colour prints with exact colour registration Expired EP0005435B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2820619 1978-05-11
DE2820619A DE2820619C2 (en) 1978-05-11 1978-05-11 Method of relaxing an arch

Publications (2)

Publication Number Publication Date
EP0005435A1 EP0005435A1 (en) 1979-11-28
EP0005435B1 true EP0005435B1 (en) 1982-12-29

Family

ID=6039140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79100765A Expired EP0005435B1 (en) 1978-05-11 1979-03-14 Method for producing multi-colour prints with exact colour registration

Country Status (9)

Country Link
EP (1) EP0005435B1 (en)
JP (1) JPS54148609A (en)
AR (1) AR220385A1 (en)
AT (1) AT376176B (en)
AU (1) AU523177B2 (en)
CA (1) CA1119459A (en)
DE (1) DE2820619C2 (en)
DK (1) DK143098C (en)
ZA (1) ZA792155B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140763C2 (en) * 1991-12-11 1997-06-19 Kba Planeta Ag Device for guiding the bow
DE19618029B4 (en) * 1996-05-04 2006-07-27 Heidelberger Druckmaschinen Ag Method and device for eliminating rhythmic register errors in sheetfed presses with multi-size cylinders

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1561072B1 (en) * 1967-03-25 1970-01-22 Heidelberger Druckmasch Ag Device on the transfer drum of sheet-fed rotary printing machines for register correction
AT303766B (en) * 1969-03-10 1972-12-11 Heidelberger Druckmasch Ag Device on the transfer drum of sheet-fed rotary printing presses for register correction
DE2713994C2 (en) * 1977-03-30 1983-01-27 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Sheet holding device of a sheet-fed rotary printing machine, which is able to slightly deform the printed sheet

Also Published As

Publication number Publication date
DK143098C (en) 1981-11-09
CA1119459A (en) 1982-03-09
EP0005435A1 (en) 1979-11-28
DE2820619C2 (en) 1986-03-27
DE2820619B1 (en) 1979-10-11
ATA209379A (en) 1984-03-15
DK160979A (en) 1979-11-12
DK143098B (en) 1981-03-30
AU4642079A (en) 1980-11-13
AU523177B2 (en) 1982-07-15
JPS5752232B2 (en) 1982-11-06
AR220385A1 (en) 1980-10-31
JPS54148609A (en) 1979-11-21
AT376176B (en) 1984-10-25
ZA792155B (en) 1980-06-25

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