EP0706881B1 - Sheet guiding system for a sheet turn-over device in a perfecting printing machine - Google Patents

Sheet guiding system for a sheet turn-over device in a perfecting printing machine Download PDF

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Publication number
EP0706881B1
EP0706881B1 EP95113345A EP95113345A EP0706881B1 EP 0706881 B1 EP0706881 B1 EP 0706881B1 EP 95113345 A EP95113345 A EP 95113345A EP 95113345 A EP95113345 A EP 95113345A EP 0706881 B1 EP0706881 B1 EP 0706881B1
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EP
European Patent Office
Prior art keywords
sheet
sheet guiding
cylinder
blowing
turning
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 - Lifetime
Application number
EP95113345A
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German (de)
French (fr)
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EP0706881A1 (en
Inventor
Hanns-Otto Haas
Ingo Köbler
Klaus Dr. Wolf
Peter Dr. Mayer
Josef Mathes
Fred Spies
Stephan Kanzler
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Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Publication date
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Publication of EP0706881A1 publication Critical patent/EP0706881A1/en
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    • 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
    • B41F21/106—Combinations of transfer drums and grippers for reversing sheets, e.g. for perfecting machine
    • B41F21/108—Combinations of transfer drums and grippers for reversing sheets, e.g. for perfecting machine with pneumatic means

Definitions

  • the invention relates to a sheet guide module in a turning device for a rotary printing press that can be used for face and reverse printing, the turning device being formed from a turning drum and at least one sheet-guiding cylinder arranged upstream in the sheet running direction between two printing units.
  • a sheet-guiding turning device of this type is known from DE-AS 2 354 418.
  • Three drums for sheet transfer are arranged between two printing units of a rotary printing press, a drum being designed as a reversing drum assigned to the subsequent printing unit in the direction of sheet travel.
  • the turning drum is preceded by a transfer drum which has flow channels which are arranged axially on the circumference at a defined distance and run in the form of grooves and acted upon by suction air.
  • This solution is intended to provide tension-free, tight support of the sheet on a transfer drum so that the sheet can be transferred to the turning drum in a fitting manner.
  • the reversing drum and transfer drum are not assigned any devices that guarantee a lubrication-free sheet guidance of the freely hanging end of the printing sheet in the turning phase.
  • a sheet transfer cylinder is known, in which the sheet is held at the beginning and end by grippers and is sucked onto the circumference of the sheet transfer cylinder by negative air pressure.
  • the sheet should thus lie flat and be drawn smooth towards the end of the sheet.
  • the transfer cylinder is for the guidance of a free-hanging sheet is unsuitable due to the arrangement of grippers on the rear edge.
  • EP 0 306 684 B1 a device for pressing a sheet flat against the printing cylinder is described. After passing through the printing zone, the sheet is guided in the area between the printing zone and the transfer area (tangent point) of the subsequent turning drum by means of blown air on the printing cylinder.
  • a sheet guiding device as a continuous guide surface which has air nozzles connected to flow channels is known, for. B. known from DE 3 411 029 C2.
  • a device for sheet guiding which lifts the sheet leading edge during the turning phase by means of blown air from the impression cylinder and guides the front part of the sheet on a guide doctor.
  • a disadvantage of these solutions is that in the turning phase in which the sheet undergoes a reversal of movement, there are insufficient means available to transport the printed sheet without smearing from the upstream sheet-guiding cylinder, a printing cylinder or a storage drum, to the turning drum.
  • the object of the invention is to develop a solution which guarantees a smear-free sheet guide, in particular the freely hanging trailing edge, of printed sheets which are turned according to the principle of trailing edge use during the turning phase in a rotary printing press.
  • the invention has the advantage that, in particular, the freely hanging, rear region of a turned sheet is prevented from smearing, so that an improvement in the print quality is achieved.
  • the solution according to the invention is suitable for rotary printing presses which operate on the principle of turning trailing edges and have one or three sheet-guiding drums / cylinders between the printing units.
  • the blowing device When arranging a sheet-guiding drum, the blowing device is assigned to the upstream pressure cylinder. With the arrangement of three sheet-guiding drums, the blowing device is assigned to the upstream storage drum.
  • a turning device is arranged between two printing units.
  • the upstream printing unit is formed in a known manner by a printing cylinder 2, a blanket cylinder 4 and a plate cylinder 5.
  • the printing unit following in the sheet running direction of the turning device is formed by a printing cylinder 3, a blanket cylinder 4 and a plate cylinder 5.
  • the inking and dampening units assigned to the plate cylinder 5 are not shown.
  • the sheet-guiding cylinders, here the impression cylinders 2, 3, are of double size and the turning device is essentially formed by a double-size turning drum 1.
  • the turning drum 1 carries on each half a gripping device 6 arranged offset by 180 °.
  • the gripping device 6 consists in a known manner of a suction system, a counterpressure gripper system and a straight-pressure gripper system with corresponding gripper supports.
  • the sheet guiding module essentially consists of a blowing device 9, two blowing / suction devices 16 integrated in the turning drum 1 and a sheet guiding device 12.
  • the blowing device 9 is after a printing zone 7 formed by printing cylinder 2 and blanket cylinder 4, but before a transfer area 8 (formed by Printing cylinder 2 and turning drum 1) the printing cylinder 2 over its length assigned.
  • the blowing device 9 has air outlet openings which are adapted to the contour of the printing cylinder 2. The air outlet openings extend as far as the transfer area 8.
  • the blowing device 9 furthermore has at least one separate air outlet opening 10 which is directed tangentially into the transfer area 8.
  • the air outlet openings 10 are subjected to a higher air pressure than the outlet openings which are directed onto the pressure cylinder 2.
  • the blowing device 9 thus has two supply lines for the supply of compressed air with different intensities and is pivotably mounted in a swivel joint 15 from the transfer area 8.
  • each circumferential surface has a plurality of air openings, e.g. Bores, which are preferably arranged at regular intervals.
  • Each blowing / suction device 16 is coupled to a pneumatic system 17.
  • the pneumatic system 17 can consist, for example, of fans arranged in the turning drum or an external air supply.
  • the external air supply is preferably coupled to the blowing / suction devices 16 by means of a rotary transformer.
  • a sheet guiding device 12 is arranged between the turning drum 1 and the upstream sheet-guiding printing cylinder 2.
  • the sheet guiding device 12 is connected to an external air supply source via a line system 11.
  • the part of the sheet guiding device 12 which is assigned to the arc riser receives its air supply via fans.
  • This part of the sheet guiding device 12 is coupled to a swivel joint 13 and can be pivoted about the pivot point of the swivel joint 13 via a working cylinder 14.
  • the mode of action is as follows: In perfecting, the sheet which is guided on the printing cylinder 2 through the printing zone 7 is pressed flat onto the printing cylinder 2 by means of air from the blowing device 9. The sheet is fed into the transfer area 8 up to the rear edge. The separate air outlet opening 10 of the blowing device 9 blows tangentially against the rear edge of the sheet, so that the rear area of the sheet is separated from the printing cylinder 2 after passing through the transfer area 8.
  • the sheet released by the gripper system of the printing cylinder is taken over by the gripping device 6 of the turning drum 1 according to the principle of turning the rear edge (turning phase). The trailing edge of the sheet thus becomes the leading edge on the turning drum 1 and is transferred to the impression cylinder 3 for the back printing.
  • the turning phase is a critical area, since the sheet has to be "peeled off” from the impression cylinder 2 in a very short time, the former leading edge (reversal of movement) becomes the freely hanging trailing edge and the printed, sagging surface of the sheet is inclined to be lubricated.
  • the “peeling” is achieved by the air flow of the separate air outlet opening 10.
  • An air cushion is thus inserted between the trailing edge of the sheet and the impression cylinder, which reduces the adhesive force of the sheet and the sliding friction (between the sheet and impression cylinder) during the turning phase.
  • the sheet guiding device 12 blows air against the printed surface of the sheet, the separate air outlet opening 10 of the blowing device 9 continuing to blow air through the transfer area 8.
  • the generation of negative pressure below the transfer area 8 is to be avoided.
  • the sheet taken over from the turning drum 1 is thus guided in its free area on the printed and the unprinted surface (from above and below) by means of air.
  • the sheet is attracted by the sucking blowing / suction device 16 and lies against the circumference of the turning drum 1 with the unprinted surface.
  • the arc following the circumference of the turning drum 1 has a slight convex curvature, which additionally has a stabilizing effect on the rear, still freely hanging area of the arc.
  • the sheet guiding device 12 in the sheet rise to the downstream printing cylinder 3 can be pivoted via the working cylinder 14 depending on the operating mode.
  • the sheet guided on the printing cylinder 2 through the printing zone 7 is transferred to the turning drum 1 with the leading edge in the transfer area 8.
  • the blowing device 9 with a separate air outlet opening 10 is pivoted out of the transfer area 8 via the swivel joint 15, so that the straight-pressure grippers of the gripping device 6 cannot collide with the blowing device 9.
  • the sheet now lies with the printed side on the circumference of the turning drum 1.
  • the blowing / suction device 16 is switched to blowing air, so that an air cushion is formed between the arc and the outer surface of the turning drum 1.
  • the air cushion prevents the sheet from smearing on the turning drum 1.
  • the sheet guiding device 12 is switched to suction air and is pivoted closer to the turning drum 1 in its sheet exit.
  • the sheet can be sucked in by the sheet guiding device 12 below the transfer area formed by the turning drum 1 and impression cylinder 3.
  • a sheet straightener can also be arranged, which stretches the sheet against the sheet running direction. As a result, the sheet is drawn flat onto the impression cylinder 3.
  • blowing / suction devices 16 can be switched on individually or in pairs depending on the format and printing material in several chambers.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Registering Or Overturning Sheets (AREA)
  • Discharge By Other Means (AREA)

Abstract

A sheet-guiding apparatus for a turning device in a rotary printing machine guides a sheet being printed to prevent smearing. The turning device includes a turning drum and at least one sheet-guiding cylinder. The turning drum and the sheet-guiding cylinder define a sheet transfer region and a sheet transfer path. The sheet-guiding apparatus comprises an air blower means, at least one blower/suction device, and a lower sheet-guiding device. The air blower means, which is arranged upstream of the sheet transfer region, includes a first set of air outlet openings for directing compressed air toward the sheet-guiding cylinder and at least a second air outlet opening for directing compressed air into the transfer region. The blower/suction device, which is disposed within the sheet-bearing surface of the turning drum, communicates with a plurality of openings disposed in the sheet-bearing surface and is coupled to a pneumatic device. The lower sheet-guiding device is disposed below the sheet transfer path and is switchable between providing compressed air and providing air suction. The air blower means, blower/suction device, and the lower sheet-guiding device cooperate to provide a combination of air blow and suction for guiding the sheet in the sheet transfer process.

Description

Die Erfindung betrifft einen Bogenführungsmodul in einer Wendeeinrichtung für eine für den Schön- und Widerdruck einsetzbare Rotationsdruckmaschine, wobei die Wendeeinrichtung aus einer Wendetrommel und mindestens einem in Bogenlaufrichtung vorgeordneten bogenführenden Zylinder zwischen zwei Druckwerken gebildet ist.The invention relates to a sheet guide module in a turning device for a rotary printing press that can be used for face and reverse printing, the turning device being formed from a turning drum and at least one sheet-guiding cylinder arranged upstream in the sheet running direction between two printing units.

Eine bogenführende Wendeeinrichtung dieser Art ist aus der DE-AS 2 354 418 bekannt. Zwischen zwei Druckwerken einer Rotationsdruckmaschine sind drei Trommeln zur Bogenübergabe angeordnet, wobei in Bogenlaufrichtung dem nachfolgenden Druckwerk zugeordnet eine Trommel als Wendetrommel ausgeführt ist. In Bogenlaufrichtung ist der Wendetrommel eine Übergabetrommel vorgeordnet, welche axial am Umfang in einem definierten Abstand angeordnete, nutenförmig verlaufende, mit Saugluft beaufschlagte Strömungskanäle aufweist. Diese Lösung soll der spannungsfreien, gestrafften Auflage des Bogens auf einer Übergabetrommel dienen, um den Bogen paßgerecht an die Wendetrommel übergeben zu können. Der Wendetrommel bzw. Übergabetrommel sind keine Einrichtungen zugeordnet, die eine abschmierfreie Bogenführung des frei hängenden Endes des Druckbogens in der Wendephase gewährleisten.A sheet-guiding turning device of this type is known from DE-AS 2 354 418. Three drums for sheet transfer are arranged between two printing units of a rotary printing press, a drum being designed as a reversing drum assigned to the subsequent printing unit in the direction of sheet travel. In the direction of sheet travel, the turning drum is preceded by a transfer drum which has flow channels which are arranged axially on the circumference at a defined distance and run in the form of grooves and acted upon by suction air. This solution is intended to provide tension-free, tight support of the sheet on a transfer drum so that the sheet can be transferred to the turning drum in a fitting manner. The reversing drum and transfer drum are not assigned any devices that guarantee a lubrication-free sheet guidance of the freely hanging end of the printing sheet in the turning phase.

Aus dem DE-G 6 949 816 ist ein Bogenübertragungszylinder bekannt, bei dem der Bogen am Anfang und Ende durch Greifer gehalten ist und durch Luftunterdruck auf dem Umfang des Bogenübertragungszylinders festgesaugt wird. Damit soll der Bogen flächig anliegen und zum Bogenende hin glattgezogen werden. Der Übertragungszylinder ist für die Führung eines freihängenden Druckbogens aufgrund der Anordnung von Greifern an der Hinterkante ungeeignet.From DE-G 6 949 816 a sheet transfer cylinder is known, in which the sheet is held at the beginning and end by grippers and is sucked onto the circumference of the sheet transfer cylinder by negative air pressure. The sheet should thus lie flat and be drawn smooth towards the end of the sheet. The transfer cylinder is for the guidance of a free-hanging sheet is unsuitable due to the arrangement of grippers on the rear edge.

Gemäß der EP 0 306 684 B1 ist eine Vorrichtung zum flächigen Anpressen eines Bogens auf den Druckzylinder beschrieben. Nach Durchlaufen der Druckzone wird der Bogen im Bereich zwischen Druckzone und dem Übergabebereich (Tangentenpunkt) der nachfolgenden Wendetrommel mittels Blasluft auf dem Druckzylinder geführt.According to EP 0 306 684 B1, a device for pressing a sheet flat against the printing cylinder is described. After passing through the printing zone, the sheet is guided in the area between the printing zone and the transfer area (tangent point) of the subsequent turning drum by means of blown air on the printing cylinder.

Eine Bogenleiteinrichtung als durchgehende Führungsfläche, die mit Strömungskanälen verbundene Luftdüsen aufweist ist z. B. aus der DE 3 411 029 C2 bekannt.A sheet guiding device as a continuous guide surface which has air nozzles connected to flow channels is known, for. B. known from DE 3 411 029 C2.

Aus der DE 4 140 763 A1 ist eine Einrichtung zur Bogenführung bekannt, die die Bogenvorderkante während der Wendephase mittels Blasluft vom Druckzylinder anhebt und den vorderen Teil des Bogens an einer Leitrakel führt.From DE 4 140 763 A1 a device for sheet guiding is known which lifts the sheet leading edge during the turning phase by means of blown air from the impression cylinder and guides the front part of the sheet on a guide doctor.

Nachteilig bei diesen Lösungen ist es, daß in der Wendephase bei der der Bogen eine Bewegungsumkehr erfährt, keine ausreichenden Mittel zur Verfügung stehen, um den bedruckten Bogen abschmierfrei von dem vorgeordneten bogenführenden Zylinder, einem Druckzylinder oder einer Speichertrommel, zur Wendetrommel zu transportieren.A disadvantage of these solutions is that in the turning phase in which the sheet undergoes a reversal of movement, there are insufficient means available to transport the printed sheet without smearing from the upstream sheet-guiding cylinder, a printing cylinder or a storage drum, to the turning drum.

Aufgabe der Erfindung ist es, eine Lösung zu entwickeln, die eine abschmierfreie Bogenführung, insbesondere der freihängenden Hinterkante, von nach dem Prinzip der Hinterkantenwendung gewendeten Druckbogen während der Wendephase in einer Rotationsdruckmaschine gewährleistet.The object of the invention is to develop a solution which guarantees a smear-free sheet guide, in particular the freely hanging trailing edge, of printed sheets which are turned according to the principle of trailing edge use during the turning phase in a rotary printing press.

Gelöst wird dies durch den kennzeichnenden Teil des Hauptanspruches, Weiterbildungen ergeben sich aus den Unteransprüchen.This is solved by the characterizing part of the main claim, further developments result from the subclaims.

Die Erfindung hat den Vorteil, daß insbesondere der freihängende, hintere Bereich eines gewendeten Bogens am Abschmieren gehindert wird, so daß eine Verbesserung der Druckqualität erreicht wird. Die erfindungsgemäße Lösung eignet sich für Rotationsdruckmaschinen, die nach dem Prinzip der Hinterkantenwendung von Bogen arbeiten und eine oder drei bogenführende Trommeln/Zylinder zwischen den Druckwerken aufweisen. Bei der Anordnung von einer bogenführenden Trommel wird die Blaseinrichtung dem vorgeordneten Druckzylinder zugeordnet. Bei der Anordnung von drei bogenführenden Trommeln ist die Blaseinrichtung der vorgeordneten Speichertrommel zugeordnet.The invention has the advantage that, in particular, the freely hanging, rear region of a turned sheet is prevented from smearing, so that an improvement in the print quality is achieved. The The solution according to the invention is suitable for rotary printing presses which operate on the principle of turning trailing edges and have one or three sheet-guiding drums / cylinders between the printing units. When arranging a sheet-guiding drum, the blowing device is assigned to the upstream pressure cylinder. With the arrangement of three sheet-guiding drums, the blowing device is assigned to the upstream storage drum.

Die Erfindung soll an einem Ausführungsbeispiel näher erläutert werden, dabei zeigt:

Fig. 1
die schematische Anordnung eines Bogenführungsmoduls mit einer Wendeeinrichtung zwischen den Druckwerken.
The invention will be explained in more detail using an exemplary embodiment, which shows:
Fig. 1
the schematic arrangement of a sheet guide module with a turning device between the printing units.

In einer bogenverarbeitenden Offsetdruckmaschine in Reihenbauweise ist zwischen zwei Druckwerken eine Wendeeinrichtung angeordnet. Das in Bogenlaufrichtung vorgeordnete Druckwerk wird in bekannter Weise durch einen Druckzylinder 2, einen Gummituchzylinder 4 und einen Plattenzylinder 5 gebildet. Analog wird das in Bogenlaufrichtung der Wendeeinrichtung nachfolgende Druckwerk durch einen Druckzylinder 3, einen Gummituchzylinder 4 und einen Plattenzylinder 5 gebildet. Die dem Plattenzylinder 5 zugeordneten Farb- und Feuchtwerke sind nicht dargestellt. Die bogenführenden Zylinder, hier die Druckzylinder 2, 3 sind zweifachgroß ausgeführt und die Wendeeinrichtung wird im wesentlichen durch eine zweifachgroße Wendetrommel 1 gebildet. Die Wendetrommel 1 trägt auf jeweils einer Hälfte eine 180° versetzt angeordnete Greifeinrichtung 6. Die Greifeinrichtung 6 besteht in bekannter Weise aus einem Saugersystem, einem Widerdruckgreifersystem und einem Schöndruckgreifersystem mit entsprechenden Greiferauflagen. Der Bogenführungsmodul besteht im wesentlichen aus einer Blaseinrichtung 9, zwei in die Wendetrommel 1 integrierte Blas-/Saugeinrichtungen 16 sowie einer Bogenführungseinrichtung 12. Die Blaseinrichtung 9 ist nach einer durch Druckzylinder 2 und Gummituchzylinder 4 gebildeten Druckzone 7, jedoch vor einem Übergabebereich 8 (gebildet durch Druckzylinder 2 und Wendetrommel 1) dem Druckzylinder 2 über dessen Länge zugeordnet. Um den Bogen auf dem Druckzylinder 2 mit Blasluft flächig angepreßt zu führen, besitzt die Blaseinrichtung 9 an die Kontur des Druckzylinders 2 angepaßte Luftaustrittsöffnungen. Die Luftaustrittsöffnungen reichen bis zum Übergabebereich 8. Die Blaseinrichtung 9 besitzt weiterhin mindestens eine separate Luftaustrittsöffnung 10, die tangential in den Übergabebereich 8 gerichtet ist. Die Luftaustrittsöffnungen 10 sind mit einem höheren Luftdruck beaufschlagt als die Austrittsöffnungen, welche auf den Druckzylinder 2 gerichtet sind. Die Blaseinrichtung 9 weist somit zwei Zuleitungen für die Zuführung von Druckluft mit unterschiedlicher Intensität auf und ist in einem Drehgelenk 15 aus dem Übergabebereich 8 schwenkbar gelagert.In a sheet-fed offset printing press in series construction, a turning device is arranged between two printing units. The upstream printing unit is formed in a known manner by a printing cylinder 2, a blanket cylinder 4 and a plate cylinder 5. Analogously, the printing unit following in the sheet running direction of the turning device is formed by a printing cylinder 3, a blanket cylinder 4 and a plate cylinder 5. The inking and dampening units assigned to the plate cylinder 5 are not shown. The sheet-guiding cylinders, here the impression cylinders 2, 3, are of double size and the turning device is essentially formed by a double-size turning drum 1. The turning drum 1 carries on each half a gripping device 6 arranged offset by 180 °. The gripping device 6 consists in a known manner of a suction system, a counterpressure gripper system and a straight-pressure gripper system with corresponding gripper supports. The sheet guiding module essentially consists of a blowing device 9, two blowing / suction devices 16 integrated in the turning drum 1 and a sheet guiding device 12. The blowing device 9 is after a printing zone 7 formed by printing cylinder 2 and blanket cylinder 4, but before a transfer area 8 (formed by Printing cylinder 2 and turning drum 1) the printing cylinder 2 over its length assigned. In order to guide the sheet onto the printing cylinder 2 with compressed air, the blowing device 9 has air outlet openings which are adapted to the contour of the printing cylinder 2. The air outlet openings extend as far as the transfer area 8. The blowing device 9 furthermore has at least one separate air outlet opening 10 which is directed tangentially into the transfer area 8. The air outlet openings 10 are subjected to a higher air pressure than the outlet openings which are directed onto the pressure cylinder 2. The blowing device 9 thus has two supply lines for the supply of compressed air with different intensities and is pivotably mounted in a swivel joint 15 from the transfer area 8.

Auf der doppeltgroßen Wendetrommel 1 sind zwischen den Greifeinrichtungen 6 zwei bogentragende Mantelflächen am Umfang angeordnet. Diese Mantelflächen werden durch zwei in der Wendetrommel 1 aufgenommene Blas-/Saugeinrichtungen 16 gebildet. Jede Mantelfläche weist am Trommelumfang eine Vielzahl von Luftöffnungen, z.B. Bohrungen, auf, die vorzugsweise in regelmäßigem Abstand angeordnet sind. Jede Blas-/Saugeinrichtung 16 ist mit einem Pneumatiksystem 17 gekoppelt. Das Pneumatiksystem 17 kann beispielsweise aus in der Wendetrommel angeordneten Ventilatoren oder einer externen Luftversorgung bestehen. Die externe Luftversorgung ist vorzugsweise mittels Drehübertrager mit den Blas-/Saugeinrichtungen 16 gekoppelt.On the double-sized turning drum 1 between the gripping devices 6, two arc-carrying lateral surfaces are arranged on the circumference. These lateral surfaces are formed by two blowing / suction devices 16 accommodated in the turning drum 1. Each circumferential surface has a plurality of air openings, e.g. Bores, which are preferably arranged at regular intervals. Each blowing / suction device 16 is coupled to a pneumatic system 17. The pneumatic system 17 can consist, for example, of fans arranged in the turning drum or an external air supply. The external air supply is preferably coupled to the blowing / suction devices 16 by means of a rotary transformer.

Unterhalb des Bogenförderweges ist zwischen der Wendetrommel 1 und dem vorgeordneten bogenführenden Druckzylinder 2 eine Bogenführungseinrichtung 12 angeordnet. Die Bogenführungseinrichtung 12 ist über ein Leitungssystem 11 mit einer externen Luftversorgungsquelle verbunden. Der dem Bogenaufgang zugeordnete Teil der Bogenführungseinrichtung 12 erhält seine Luftversorgung über Ventilatoren. Dieser Teil der Bogenführungseinrichtung 12 ist mit einem Drehgelenk 13 gekoppelt und ist über einen Arbeitszylinder 14 um den Drehpunkt des Drehgelenkes 13 schwenkbar.Below the sheet conveying path, a sheet guiding device 12 is arranged between the turning drum 1 and the upstream sheet-guiding printing cylinder 2. The sheet guiding device 12 is connected to an external air supply source via a line system 11. The part of the sheet guiding device 12 which is assigned to the arc riser receives its air supply via fans. This part of the sheet guiding device 12 is coupled to a swivel joint 13 and can be pivoted about the pivot point of the swivel joint 13 via a working cylinder 14.

Die Wirkungsweise ist wie folgt:
Im Schön- und Widerdruck wird der auf dem Druckzylinder 2 durch die Druckzone 7 geführte Bogen mittels Luft der Blaseinrichtung 9 auf den Druckzylinder 2 flächig gepreßt. Der Bogen wird bis zur Hinterkante in den Übergabebereich 8 geführt. Die separate Luftaustrittsöffnung 10 der Blaseinrichtung 9 bläst tangential gegen die Hinterkante des Bogens, so daß der hintere Bereich des Bogens nach Passieren des Übergabebereiches 8 vom Druckzylinder 2 getrennt wird. Der vom Greifersystem des Druckzylinders freigegebene Bogen wird von der Greifeinrichtung 6 der Wendetrommel 1 nach dem Prinzip der Hinterkantenwendung übernommen (Wendephase). Die Hinterkante des Bogens wird somit zur Vorderkante auf der Wendetrommel 1 und wird an den Druckzylinder 3 für den Widerdruck übergeben.The mode of action is as follows:
In perfecting, the sheet which is guided on the printing cylinder 2 through the printing zone 7 is pressed flat onto the printing cylinder 2 by means of air from the blowing device 9. The sheet is fed into the transfer area 8 up to the rear edge. The separate air outlet opening 10 of the blowing device 9 blows tangentially against the rear edge of the sheet, so that the rear area of the sheet is separated from the printing cylinder 2 after passing through the transfer area 8. The sheet released by the gripper system of the printing cylinder is taken over by the gripping device 6 of the turning drum 1 according to the principle of turning the rear edge (turning phase). The trailing edge of the sheet thus becomes the leading edge on the turning drum 1 and is transferred to the impression cylinder 3 for the back printing.

Die Wendephase ist ein kritischer Bereich, da der Bogen in sehr kurzer Zeit vom Druckzylinder 2 "abgeschält" werden muß, die ehemalige Vorderkante (Bewegungsumkehr) zur freihängenden Hinterkante wird und die bedruckte, durchhängende Fläche des Bogens geneigt ist abzuschmieren. Das "Abschälen" wird durch die Luftströmung der separaten Luftaustrittsöffnung 10 erreicht. Zwischen Bogenhinterkante und Druckzylinder wird somit ein Luftkissen eingebracht, das die Haftkraft des Bogens und die Gleitreibung (zwischen Bogen und Druckzylinder) in der Wendephase reduziert. Die Bogenführungseinrichtung 12 bläst Luft gegen die bedruckte Fläche des Bogens, wobei die separate Luftaustrittsöffnung 10 der Blaseinrichtung 9 weiterhin Luft durch den Übergabebereich 8 bläst. Dadurch soll unter anderem die Entstehung von Unterdruck unterhalb des Übergabebereiches 8 vermieden werden. Der von der Wendetrommel 1 übernommene Bogen wird somit in seinem freien Bereich an der bedruckten und der unbedruckten Fläche (von oben und unten) mittels Luft geführt. Bei weiterer Drehung der Wendetrommel 1 wird der Bogen von der saugenden Blas-/Saugeinrichtung 16 angezogen und legt sich an dem Umfang der Wendetrommel 1 mit der unbedruckten Fläche an. Der dem Umfang der Wendetrommel 1 folgende Bogen erhält eine leichte konvexe Krümmung, was sich zusätzlich stabilisierend auf den hinteren, noch freihängenden Bereich des Bogens auswirkt. Durch die Kombination von Luftführung und zusätzlicher Stabilisierung wird das Abschmieren des bedruckten Bogenseite gegen die Bogenführungseinrichtung 12 vermieden. Die Bogenführungseinrichtung 12 im Bogenaufgang zum nachgeordneten Druckzylinder 3 ist über den Arbeitszylinder 14 je nach Betriebsart schwenkbar.The turning phase is a critical area, since the sheet has to be "peeled off" from the impression cylinder 2 in a very short time, the former leading edge (reversal of movement) becomes the freely hanging trailing edge and the printed, sagging surface of the sheet is inclined to be lubricated. The "peeling" is achieved by the air flow of the separate air outlet opening 10. An air cushion is thus inserted between the trailing edge of the sheet and the impression cylinder, which reduces the adhesive force of the sheet and the sliding friction (between the sheet and impression cylinder) during the turning phase. The sheet guiding device 12 blows air against the printed surface of the sheet, the separate air outlet opening 10 of the blowing device 9 continuing to blow air through the transfer area 8. In this way, among other things, the generation of negative pressure below the transfer area 8 is to be avoided. The sheet taken over from the turning drum 1 is thus guided in its free area on the printed and the unprinted surface (from above and below) by means of air. As the turning drum 1 rotates further, the sheet is attracted by the sucking blowing / suction device 16 and lies against the circumference of the turning drum 1 with the unprinted surface. The arc following the circumference of the turning drum 1 has a slight convex curvature, which additionally has a stabilizing effect on the rear, still freely hanging area of the arc. By the combination of air guidance and additional stabilization prevents the printed sheet side from smearing against the sheet guiding device 12. The sheet guiding device 12 in the sheet rise to the downstream printing cylinder 3 can be pivoted via the working cylinder 14 depending on the operating mode.

Im Schöndruck wird der auf dem Druckzylinder 2 durch die Druckzone 7 geführte Bogen mit der Vorderkante im Übergabebereich 8 an die Wendetrommel 1 übergeben. Die Blaseinrichtung 9 mit separater Luftaustrittsöffnung 10 ist aus dem Übergabebereich 8 über das Drehgelenk 15 herausgeschwenkt, so daß die Schöndruckgreifer der Greifeinrichtung 6 nicht mit der Blaseinrichtung 9 kollidieren können. Der Bogen liegt nun mit der bedruckten Seite auf dem Umfang der Wendetrommel 1 auf. Die Blas-/Saugeinrichtung 16 ist auf Blasluft umgestellt, so daß sich zwischen Bogen und Mantelfläche der Wendetrommel 1 ein Luftpolster bildet. Das Luftpolster verhindert ein Abschmieren des Bogens auf der Wendetrommel 1. Die Bogenführungseinrichtung 12 ist auf Saugluft umgestellt und in ihrem Bogenausgang näher an die Wendetrommel 1 angeschwenkt. Dadurch kann der Bogen unterhalb des von Wendetrommel 1 und Druckzylinder 3 gebildeten Übergabebereiches von der Bogenführungseinrichtung 12 angesaugt werden. Am Ende der Bogenführungseinrichtung 12 kann ebenso ein Bogenglätter angeordnet sein, der den Bogen entgegen der Bogenlaufrichtung streckt. Dadurch wird der Bogen auf den Druckzylinder 3 flächig aufgezogen.In straight printing, the sheet guided on the printing cylinder 2 through the printing zone 7 is transferred to the turning drum 1 with the leading edge in the transfer area 8. The blowing device 9 with a separate air outlet opening 10 is pivoted out of the transfer area 8 via the swivel joint 15, so that the straight-pressure grippers of the gripping device 6 cannot collide with the blowing device 9. The sheet now lies with the printed side on the circumference of the turning drum 1. The blowing / suction device 16 is switched to blowing air, so that an air cushion is formed between the arc and the outer surface of the turning drum 1. The air cushion prevents the sheet from smearing on the turning drum 1. The sheet guiding device 12 is switched to suction air and is pivoted closer to the turning drum 1 in its sheet exit. As a result, the sheet can be sucked in by the sheet guiding device 12 below the transfer area formed by the turning drum 1 and impression cylinder 3. At the end of the sheet guiding device 12, a sheet straightener can also be arranged, which stretches the sheet against the sheet running direction. As a result, the sheet is drawn flat onto the impression cylinder 3.

Die Blas-/Saugeinrichtungen 16 sind abhängig von Format und Bedruckstoff in mehreren Kammern einzeln oder paarweise zuschaltbar.The blowing / suction devices 16 can be switched on individually or in pairs depending on the format and printing material in several chambers.

BezugszeichenaufstellungList of reference symbols

11
WendetrommelTurning drum
22nd
DruckzylinderImpression cylinder
33rd
DruckzylinderImpression cylinder
44th
GummituchzylinderBlanket cylinder
55
PlattenzylinderPlate cylinder
66
GreifeinrichtungGripping device
77
DruckzonePressure zone
88th
ÜbergabebereichTransfer area
99
BlaseinrichtungBlowing device
1010th
separate Luftaustrittsöffnungseparate air outlet
1111
LeitungssystemPipe system
1212th
BogenführungseinrichtungSheet guiding device
1313
DrehgelenkSwivel
1414
ArbeitszylinderWorking cylinder
1515
DrehgelenkSwivel
1616
Blas-/SaugeinrichtungBlower / suction device
1717th
PneumatiksystemPneumatic system

Claims (8)

  1. Sheet guiding module in a turning device for a rotary printing press which can be set to perfect printing, wherein the turning device is formed a turning drum having a sheet holding system and at least one sheet guiding cylinder arranged beforehand seen in the sheet running direction between two printing units, characterised in that in the sheet running direction before a transfer region (8) formed by turning drum (1) and sheet guiding cylinder (2) is arranged a blowing unit (9) extending axially parallel along the length of the cylinder (2), which has air outlet openings directed on to the cylinder (2) and at least one separate air outlet opening (10) which is directed tangentially into the transfer region (8) and that within the turning drum (1), each sheet carrying cover surface is fitted with a blowing/sucking unit (16) coupled with a pneumatic system and communicating with a plurality of openings within the cover surface and that below the sheet guidance path between turning drum (1) and sheet guiding cylinder (2), a sheet guiding unit (12) which can be switched over between blowing and suction air is arranged.
  2. Sheet guiding module according to Claim 1, characterised in that the separate air outlet opening (10) can be subjected to a different preferably higher intensity of blowing air relative to the blowing device (9).
  3. Sheet guiding module according to Claim 1, characterised in that the blowing device (9) is swivellable out of the transfer region (8).
  4. Sheet guiding module according to Claim 1, characterised in that the blowing/suction unit (16) is adjustable in verso-printing to suction and in single side printing to blowing air.
  5. Sheet guiding module according to Claim 1, characterised in that the pneumatic system is formed by fans or a separate air supply unit.
  6. Sheet guiding module according to Claim 1, characterised in that the sheet guiding device (12) is swivellable by means of working cylinder (14) and pivot (13) in the sheet approach to the turning drum (1).
  7. Sheet guiding module according to Claim 1, characterised in that the pneumatic system (17) is switchable over individually or in pairs to blowing or sucking.
  8. Sheet guiding module according to Claim 1, characterised in that with the arrangement of a sheet guiding drum between the printing units, the blowing unit (9, 10) of one impression cylinder (2) is equipped as sheet guiding cylinder or with the arrangement of three drums between two printing units, the blowing device (9, 10) of the previously arranged storage drum is fitted as a sheet guiding cylinder.
EP95113345A 1994-09-29 1995-08-25 Sheet guiding system for a sheet turn-over device in a perfecting printing machine Expired - Lifetime EP0706881B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4434778A DE4434778C1 (en) 1994-09-29 1994-09-29 Sheet guide between guide cylinder and drum in rotary printing press
DE4434778 1994-09-29

Publications (2)

Publication Number Publication Date
EP0706881A1 EP0706881A1 (en) 1996-04-17
EP0706881B1 true EP0706881B1 (en) 1997-12-29

Family

ID=6529489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113345A Expired - Lifetime EP0706881B1 (en) 1994-09-29 1995-08-25 Sheet guiding system for a sheet turn-over device in a perfecting printing machine

Country Status (5)

Country Link
US (1) US5598779A (en)
EP (1) EP0706881B1 (en)
JP (1) JP2788432B2 (en)
AT (1) ATE161472T1 (en)
DE (2) DE4434778C1 (en)

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Also Published As

Publication number Publication date
JPH08108520A (en) 1996-04-30
US5598779A (en) 1997-02-04
ATE161472T1 (en) 1998-01-15
DE4434778C1 (en) 1995-11-30
EP0706881A1 (en) 1996-04-17
DE59501162D1 (en) 1998-02-05
JP2788432B2 (en) 1998-08-20

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