EP0706882B1 - Sheet conveying drum for a printing machine - Google Patents
Sheet conveying drum for a printing machine Download PDFInfo
- Publication number
- EP0706882B1 EP0706882B1 EP95116073A EP95116073A EP0706882B1 EP 0706882 B1 EP0706882 B1 EP 0706882B1 EP 95116073 A EP95116073 A EP 95116073A EP 95116073 A EP95116073 A EP 95116073A EP 0706882 B1 EP0706882 B1 EP 0706882B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet guiding
- sheet
- blowing device
- arrangement according
- drum
- 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
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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
- B41F21/102—Combinations of transfer drums and grippers with pneumatic means
Definitions
- the invention relates to a sheet-guiding drum arrangement for a printing press, provided with at least one gripper bridge, which enables the contact-free sheet transport within the printing press, preferably between the printing units or their further processing units, e.g. Painting works, serves.
- a device of this type is known from DE-AS 1 102 767. Then one or two (in the case of a double-sized drum with two sheet-bearing lateral surfaces) gripper bridges are arranged on a sheet-guiding drum.
- the gripper bar is designed with a rectangular cross-section and causes a uniform vacuum between the sheet and the associated sheet guiding device (envelope body) when rotating. The gripper bar sucks some of the air from the sheet guide, so that the sheet is pressed against the sheet guide by the normal air pressure from the inside of the sheet.
- the disadvantage here is that the sheet is pressed against the sheet guiding device as a result of the normal air pressure. If the side facing the sheet guiding device is printed, this leads to impairments in the print quality (the sheet smears off).
- Another disadvantage is that after the sheet has been transferred from the sheet-guiding drum to the next printing cylinder, the rear area of the sheet can no longer be guided on the sheet guiding device as a result of the reduced vacuum, i.e. the bow lifts off.
- a further drum is known from EP 0 230 032 B1, which has guiding surfaces which are essentially secant between at least two gripper bridges within the drum circumference owns.
- the guiding surfaces are intended to serve as air scoops, which generate an air jam in printing operation, which keeps the respective sheet with the printed surface away from the guiding surfaces and thus should ensure lubrication-free and guillotine-free sheet guidance.
- the guide surfaces can also implement the sheet guidance with a sheet guiding device arranged outside the lateral surface of the drum.
- the guide surfaces which can also be formed by guide plates, serve to guide the trailing edge of the sheet when the sheet is transferred to the subsequent printing cylinder.
- a disadvantage of these designs is that the drum has a high mass due to its design. In printing operation, depending on the number of gripper bars, centrifugal forces occur which have a negative effect on the registration. Furthermore, the desired dynamic pressure is dependent on the machine speed and is therefore subject to fluctuations.
- a rotary printing press with a transfer body arranged between two printing units is known, which is preferably suitable for sheet metal printing.
- This transfer body has two conical support disks or stops on a shaft for guiding the sheets on the side edges or the rear edge.
- Continuous gripper bridges, which are supported with their side surfaces on the shaft, are arranged concentrically around the support disks / stops.
- a sheet guiding device is known in the delivery drum area.
- the sheets are removed from a printing cylinder by a rapier system, which are arranged on endless chains, passed around a chain wheel and fed to the delivery stack.
- a fixed blowing device is arranged within the circumference of the chain wheels, which influences the sheet travel outwards against the sheet guide path by means of blowing air.
- the disadvantage here is that the sheet is guided with the printed side against the blowing device and thus the print quality can be impaired.
- a transfer drum for drying sheets printed on one side is known.
- the transfer drum has an outer surface made of perforated sheet metal or similar mesh.
- a first channel for supplying warm air and a second channel for supplying cold air are arranged inside the transfer drum in the direction of sheet travel.
- the air is directed to the inner surface of the jacket by means of pipes and exits from the pipe openings and the openings in the perforated sheet.
- the sheet is to be conveyed while floating on the drum circumference and can be partially pressed against an adjacent sheet guide.
- a blow air drum with an adjacent sheet guide, in the form of a blow plate is known.
- the blown air drum has drum caps that rotate together with the bows in the gripper closure.
- the drum caps have blowing nozzles which are intended to build up an air cushion between the outer surface of the blowing air drum and the underside of the bend. The radial position of the drum caps can be adjusted.
- the object of the invention is to provide a sheet-guiding drum body with low mass, which allows contactless sheet transport, in particular for sheets printed on both sides.
- the drum body ensures non-contact sheet transport from a printing cylinder to a downstream printing cylinder or a downstream drum.
- the sheet (except for the front edge fixed in the gripper closure) is guided freely on an air cushion.
- the blower is flowed approximately perpendicularly on both sides by the blowing device and the sheet guiding device, so that a contactless Arch guidance is achieved.
- the inflow takes place with approximately the same pressure conditions, so that there is no negative pressure which has a negative effect on the sheet guide.
- the blowing device of the drum body preferably comprises a circular sector which is approximately formed by the transfer area of the upstream cylinder and the transfer area of the downstream cylinder / drum.
- the blowing device can comprise a larger circular sector, for example if the freshly printed or lacquered sheet is to be guided on the upstream printing cylinder for as long as possible.
- at least one separate air outlet opening is additionally provided within the blowing device, the air flow of which is directed approximately tangentially to the upstream pressure cylinder. In a further embodiment, this can also be achieved by a fixed blowpipe, the air flow of which is also directed tangentially to the upstream pressure cylinder.
- the invention is suitable for drum bodies with one, two, three or four gripper bridges arranged symmetrically on the circumference.
- a sheet-guiding drum body 4 is arranged downstream of a printing cylinder 2 of the preceding printing unit in an offset rotary printing press, and the drum body 4 is a sheet guiding cylinder 13 downstream of a drying unit.
- the impression cylinder 2 is operatively connected to a blanket cylinder 3.
- the blanket cylinder 3 can, for example, also be a forme cylinder of a coating unit.
- a sheet guide cylinder 1 is arranged upstream of the impression cylinder 2 in the direction of sheet travel.
- the drum body 4 (according to FIGS. 1 and 2), based on a single-sized pressure cylinder, is designed with a double-sized diameter and thus carries two gripper bridges 6, 7.
- each gripper bridge 6 or 7 consists of a gripper shaft, grippers and at least one gripper bar.
- the gripper bar supports support blocks assigned to each gripper for the individual gripper support.
- the drum body 4 is rotatably received with its two shaft journals 15 in a mounting of a frame 14.
- the aligned shaft journals 15 are hollow. Each pin 15 is fixed to a support disk 16, which are connected to each other by a gripper bar 18 per gripper bridge 6, 7. The complete gripper bridge 6 or 7 is fixed on the gripper bar 18.
- the support disks 16 are designed to run essentially as a secant to form a gripper envelope circle 5.
- an axis 8 fixed to the frame is concentrically arranged, on which two support arms 17 are fixed.
- the support arms 17 support a blower device 9 connecting the support arms 17.
- the blower device is assigned a plurality of fans for generating blown air.
- the air generation can also be realized via a pneumatic system with an external air supply.
- blow pipe 10 In order to guide a sheet 11 without smearing on the pressure cylinder 2, an air flow directed approximately tangentially against the pressure cylinder 2 is generated by a blow pipe 10, which is adjacent to the blowing device 9. The rear part of the arch is supported by an air cushion.
- This blow pipe 10 has an external air supply.
- the blowpipe 10 preferably has a plurality of openings arranged distributed over the cylinder width.
- the mode of operation is as follows: the sheet 11 is transferred from the impression cylinder 2 to the gripper bridge 6 or 7 of the drum body 4. The rear part of the sheet 11 still located on the pressure cylinder 2 is supported by an air flow emerging from the blowpipe 10 so that the sheet 11 does not come into contact with the drum body 4.
- the blowpipe 10 can also be designed so that it can be switched off, so that only the blowing device 9 takes over the sheet guidance.
- the blowing device 9 now supports the sheet 11 by the air flow while the gripper bridge 6 or 7 with the sheet 11 moves into the sheet outlet. Blown air is applied to the sheet guiding device 12, so that air flows from both sides onto the printed sheet 11 and is guided through the sheet outlet and the subsequent sheet emergence without contact.
- the sheet 11 is then transferred to the subsequent sheet guide cylinder 13.
Landscapes
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Discharge By Other Means (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Replacement Of Web Rolls (AREA)
- Ink Jet (AREA)
Abstract
Description
Die Erfindung betrifft einen mit mindestens einer Greiferbrücken versehenen bogenführenden Trommelanordnung für eine Druckmaschine, der dem berührungsfreien Bogentransport innerhalb der Druckmaschine, vorzugsweise zwischen den Druckwerken oder deren Weiterverarbeitungseinheiten, wie z.B. Lackierwerken, dient.The invention relates to a sheet-guiding drum arrangement for a printing press, provided with at least one gripper bridge, which enables the contact-free sheet transport within the printing press, preferably between the printing units or their further processing units, e.g. Painting works, serves.
Eine Vorrichtung dieser Art ist aus der DE-AS 1 102 767 bekannt. Danach sind eine oder auch zwei (bei doppeltgroßer Trommel mit zwei bogentragenden Mantelflächen) Greiferbrücken an einer bogenführenden Trommel angeordnet. Die Greiferaufschlagleiste ist mit einem rechteckigen Querschnitt ausgeführt und bewirkt bei Rotation einen gleichmäßigen Unterdruck zwischen dem Bogen und der zugeordneten Bogenleiteinrichtung (Hüllkörper). Die Greiferaufschlagleiste saugt einen Teil der Luft von der Bogenleiteinrichtung ab, so daß der Bogen durch den normalen Luftdruck von der Bogeninnenseite gegen die Bogenleiteinrichtung gedrückt wird.A device of this type is known from DE-AS 1 102 767. Then one or two (in the case of a double-sized drum with two sheet-bearing lateral surfaces) gripper bridges are arranged on a sheet-guiding drum. The gripper bar is designed with a rectangular cross-section and causes a uniform vacuum between the sheet and the associated sheet guiding device (envelope body) when rotating. The gripper bar sucks some of the air from the sheet guide, so that the sheet is pressed against the sheet guide by the normal air pressure from the inside of the sheet.
Nachteilig dabei ist, daß der Bogen in Folge des normalen Luftdruckes gegen die Bogenleiteinrichtung gedrückt wird. Ist die der Bogenleiteinrichtung zugewandte Seite bedruckt, so führt dies zu Beeinträchtigungen in der Druckqualität (der Bogen schmiert ab). Weiterhin ist nachteilig, daß nach Übergabe des Bogens von der bogenführenden Trommel zum nächsten Druckzylinder der hintere Bereich des Bogens in Folge des abgebauten Unterdruckes nicht mehr an der Bogenleiteinrichtung geführt werden kann, d.h. der Bogen hebt ab.The disadvantage here is that the sheet is pressed against the sheet guiding device as a result of the normal air pressure. If the side facing the sheet guiding device is printed, this leads to impairments in the print quality (the sheet smears off). Another disadvantage is that after the sheet has been transferred from the sheet-guiding drum to the next printing cylinder, the rear area of the sheet can no longer be guided on the sheet guiding device as a result of the reduced vacuum, i.e. the bow lifts off.
Aus der EP 0 230 032 B1 ist eine weitere Trommel bekannt, die zwischen mindestens zwei Greiferbrücken innerhalb des Trommelumfanges im wesentlichen als Sekante ausgebildete Leitflächen besitzt. Die Leitflächen sollen als Luftschaufeln dienen, welche im Druckbetrieb einen Luftstau erzeugen, der den jeweiligen Bogen mit der bedruckten Fläche von den Leitflächen fernhält und somit eine schmier- und doublierfreie Bogenführung gewährleisten soll. Die Leitflächen können auch mit einer außerhalb zur Mantelfläche der Trommel angeordneten Bogenleiteinrichtung die Bogenführung realisieren. Ebenso dienen die Leitflächen, die auch durch Leitbleche gebildet sein können, zur Führung der Bogenhinterkante bei Übergabe des Bogens an den nachfolgenden Druckzylinder.A further drum is known from EP 0 230 032 B1, which has guiding surfaces which are essentially secant between at least two gripper bridges within the drum circumference owns. The guiding surfaces are intended to serve as air scoops, which generate an air jam in printing operation, which keeps the respective sheet with the printed surface away from the guiding surfaces and thus should ensure lubrication-free and guillotine-free sheet guidance. The guide surfaces can also implement the sheet guidance with a sheet guiding device arranged outside the lateral surface of the drum. Likewise, the guide surfaces, which can also be formed by guide plates, serve to guide the trailing edge of the sheet when the sheet is transferred to the subsequent printing cylinder.
Es ist weiterhin im Druckmaschinenbau bekannt, bogenführende Trommeln mit zwei Greiferbrücken als prismatische Körper in Form eines Quaders auszubilden. An Grund- und Deckfläche des Quaders sind die Greiferbrücken angeordnet und die vollflächig ausgeführten Seitenflächen stellen die Leitflächen dar. An den Stirnseiten sind Trommelzapfen angeordnet, welche gestellseitig gelagert sind. Abhängig von dem zu verarbeitenden Bedruckstoff können am Quader zwei kreissegmentförmige Trommelkappen angeordnet werden, die wiederum eine zylindrische Trommel bilden.It is also known in printing press construction to design sheet-guiding drums with two gripper bridges as a prismatic body in the form of a cuboid. The gripper bridges are arranged on the base and top surface of the cuboid and the full-surface side surfaces represent the guide surfaces. Drum pins are arranged on the end faces and are mounted on the frame side. Depending on the substrate to be processed, two circular segment drum caps can be arranged on the cuboid, which in turn form a cylindrical drum.
Nachteilig bei diesen Ausführungen ist, daß die Trommel durch ihre Bauart eine hohe Masse aufweist. Bei Druckbetrieb treten abhängig von der Anzahl der Greiferbrücken Einzelfliehkräfte auf, die sich nachteilig auf die Passerhaltigkeit auswirken. Weiterhin ist der gewünschte Staudruck von der Maschinengeschwindigkeit abhängig und somit Schwankungen unterworfen.A disadvantage of these designs is that the drum has a high mass due to its design. In printing operation, depending on the number of gripper bars, centrifugal forces occur which have a negative effect on the registration. Furthermore, the desired dynamic pressure is dependent on the machine speed and is therefore subject to fluctuations.
Aus der DE-PS 725 705 ist eine Rotationsdruckmaschine mit einem zwischen zwei Druckwerken angeordneten Transferkörper bekannt, welcher vorzugsweise für den Blechdruck geeignet ist. Dieser Transferkörper besitzt auf einer Welle zwei konische Tragscheiben oder Anschläge zur Führung der Bleche an den Seitenrändern oder der Hinterkante. Konzentrisch um die Tragscheiben/Anschläge sind auf dieser Welle weiterhin umlaufende Greiferbrücken angeordnet, welche mit ihren Seitenflächen auf der Welle abgestützt sind.From DE-PS 725 705 a rotary printing press with a transfer body arranged between two printing units is known, which is preferably suitable for sheet metal printing. This transfer body has two conical support disks or stops on a shaft for guiding the sheets on the side edges or the rear edge. Continuous gripper bridges, which are supported with their side surfaces on the shaft, are arranged concentrically around the support disks / stops.
Nachteilig bei dieser Ausführung ist es, daß damit kein berührungsfreier Bogentransport möglich ist. Je geringer das Flächengewicht des Bedruckstoffes ist, desto mehr legt sich dieser an die konischen Flächen der Tragscheiben oder die Anschläge (speziell an deren Enden) auf. Das auf den Bedruckstoff aufgebrachte Medium, beispielsweise Farbe oder Lack, schmiert ab.The disadvantage of this design is that it does not allow contact-free sheet transport. The lower the basis weight of the substrate, the more it lies on the conical surfaces of the support disks or the stops (especially at their ends). The medium applied to the substrate, such as ink or varnish, smears off.
Gemäß der US-PS 3 334 897 ist eine Bogenleiteinrichtung im Auslegertrommelbereich bekannt. Die Bogen werden von Greifersystemen, die an endlosen Ketten angeordnet sind, von einem Druckzylinder abgenommen um ein Kettenrad geführt und dem Auslegerstapel zugeführt. Innerhalb des Umfanges der Kettenräder ist eine feststehende Blaseinrichtung angeordnet, welche mittels Blasluft den Bogenlauf nach außen gegen die Bogenleitbahn beeinflußt.According to US Pat. No. 3,334,897, a sheet guiding device is known in the delivery drum area. The sheets are removed from a printing cylinder by a rapier system, which are arranged on endless chains, passed around a chain wheel and fed to the delivery stack. A fixed blowing device is arranged within the circumference of the chain wheels, which influences the sheet travel outwards against the sheet guide path by means of blowing air.
Nachteilig ist dabei, daß der Bogen mit der bedruckten Seite gegen die Blaseinrichtung geführt wird und somit die Druckqualität beeinträchtigt werden kann.The disadvantage here is that the sheet is guided with the printed side against the blowing device and thus the print quality can be impaired.
Aus der DE-PS 510 456 ist eine Umführtrommel zum Trocknen von einseitig bedruckten Bogen bekannt. Die Umführtrommel besitzt eine Mantelfläche aus gelochtem Blech oder ähnlichen Geflecht. Im Inneren der Umführtrommel ist in Bogenlaufrichtung ein erster Kanal zur Zufuhr von Warmluft und ein zweiter Kanal zur Zufuhr von Kaltluft angeordnet. Die Luft wird mittels Rohren an die Mantelinnenfläche geleitet und tritt aus den Rohröffnungen und den Öffnungen des gelochten Bleches aus. Dabei soll der Bogen schwebend auf dem Trommelumfang gefördert werden und kann teilweise an eine benachbarte Bogenführung angedrückt werden.From DE-PS 510 456 a transfer drum for drying sheets printed on one side is known. The transfer drum has an outer surface made of perforated sheet metal or similar mesh. A first channel for supplying warm air and a second channel for supplying cold air are arranged inside the transfer drum in the direction of sheet travel. The air is directed to the inner surface of the jacket by means of pipes and exits from the pipe openings and the openings in the perforated sheet. The sheet is to be conveyed while floating on the drum circumference and can be partially pressed against an adjacent sheet guide.
Weiterhin ist aus der DE 35 36 536 A1 eine Blaslufttrommel mit einer benachbarten Bogenführung, in Form eines Blasbleches, bekannt. Die Blaslufttrommel weißt Trommelkappen auf, die gemeinsam mit den im Greiferschluß gefaßten Bogen rotieren. Die Trommelkappen weisen Blasdüsen auf, die ein Luftpolster zwischen Mantelfläche der Blaslufttrommel und der Unterseite des Bogen aufbauen sollen. Die Trommelkappen sind in ihrer radialen Lage veränderlich einstellbar.Furthermore, from DE 35 36 536 A1 a blow air drum with an adjacent sheet guide, in the form of a blow plate, is known. The blown air drum has drum caps that rotate together with the bows in the gripper closure. The drum caps have blowing nozzles which are intended to build up an air cushion between the outer surface of the blowing air drum and the underside of the bend. The radial position of the drum caps can be adjusted.
Aufgabe der Erfindung ist es einen bogenführenden Trommelkörper mit geringer Masse zu schaffen, der einen berührungslosen Bogentransport insbesondere für beidseitig bedruckte Bogen gestattet.The object of the invention is to provide a sheet-guiding drum body with low mass, which allows contactless sheet transport, in particular for sheets printed on both sides.
Gelöst wird die Aufgabe durch die kennzeichnenden Merkmale des Hauptanspruches. Weiterbildungen ergeben sich aus den Unteransprüchen.The task is solved by the characteristic features of the main claim. Further training results from the subclaims.
Der Trommelkörper gewährleistet in Verbindung mit der Bogenleiteinrichtung einen berührungsfreien Bogentransport von einem Druckzylinder zu einem nachgeordneten Druckzylinder oder auch einer nachgeordneten Trommel. Bei beidseitig bedruckten und noch relativ druckfrischen Bogen, die auch zusätzlich ein- oder mehrfach lackiert sein können, wird der Bogen (außer der im Greiferschluß fixierten Vorderkante) frei auf einem Luftpolster geführt. Der Bogen wird dabei beidseitig annähernd senkrecht von der Blaseinrichtung und der Bogenleiteinrichtung angeströmt, so daß eine berührungslose Bogenführung erzielt wird. Die Anströmung erfolgt mit annähernd gleichen Druckverhältnissen, so daß kein sich negativ auf die Bogenführung auswirkender Unterdruck entsteht. Die Blaseinrichtung des Trommelkörpers umfaßt vorzugsweise einen Kreissektor, der annähernd durch den Übergabebereich des vorgeordneten Zylinders und den Übergabebereich des nachgeordneten Zylinders/der Trommel gebildet ist. Die Blaseinrichtung kann abhängig von der Zylinderanordnung innerhalb der Druckmaschine einen größeren Kreissektor umfassen, beispielsweise wenn der frisch bedruckte oder lackierte Bogen möglichst lange auf dem vorgeordneten Druckzylinder geführt werden soll. Für diese Ausbildung ist innerhalb der Blaseinrichtung zusätzlich mindestens eine separate Luftaustrittsöffnung vorgesehen, deren Luftströmung annähernd tangential auf den vorgeordneten Druckzylinder gerichtet ist. In einer weiteren Ausbildung läßt sich dies auch durch ein feststehendes Blasrohr erzielen, dessen Luftströmung ebenfalls tangential auf den vorgeordneten Druckzylinder gerichtet ist. Die Erfindung eignet sich für Trommelkörper mit einer, zwei, drei oder vier symmetrisch am Umfang angeordneten Greiferbrücken.In conjunction with the sheet guiding device, the drum body ensures non-contact sheet transport from a printing cylinder to a downstream printing cylinder or a downstream drum. In the case of sheets that are printed on both sides and are still relatively fresh from the press, which can also be varnished one or more times, the sheet (except for the front edge fixed in the gripper closure) is guided freely on an air cushion. The blower is flowed approximately perpendicularly on both sides by the blowing device and the sheet guiding device, so that a contactless Arch guidance is achieved. The inflow takes place with approximately the same pressure conditions, so that there is no negative pressure which has a negative effect on the sheet guide. The blowing device of the drum body preferably comprises a circular sector which is approximately formed by the transfer area of the upstream cylinder and the transfer area of the downstream cylinder / drum. Depending on the cylinder arrangement within the printing press, the blowing device can comprise a larger circular sector, for example if the freshly printed or lacquered sheet is to be guided on the upstream printing cylinder for as long as possible. For this design, at least one separate air outlet opening is additionally provided within the blowing device, the air flow of which is directed approximately tangentially to the upstream pressure cylinder. In a further embodiment, this can also be achieved by a fixed blowpipe, the air flow of which is also directed tangentially to the upstream pressure cylinder. The invention is suitable for drum bodies with one, two, three or four gripper bridges arranged symmetrically on the circumference.
Die Erfindung soll an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail using an exemplary embodiment.
Dabei zeigen:
- Fig. 1
- einen Trommelkörper für zwei Greiferbrücken in Seitenansicht (Schnitt A-A),
- Fig. 2
- den Trommelkörper gemäß Fig. 1 in Vorderansicht (Schnitt).
- Fig. 1
- a drum body for two gripper bars in side view (section AA),
- Fig. 2
- 1 in front view (section).
Ein bogenführender Trommelkörper 4 ist in einer Offsetrotationsdruckmaschine einem Druckzylinder 2 des vorhergehenden Druckwerkes nachgeordnet und dem Trommelkörper 4 ist ein Bogenführungszylinder 13 einer Trockeneinheit nachgeordnet. Der Druckzylinder 2 steht mit einem Gummituchzylinder 3 in Wirkverbindung. Der Gummituchzylinder 3 kann beispielsweise auch ein Formzylinder einer Lackiereinheit sein. Dem Druckzylinder 2 ist in Bogenlaufrichtung ein Bogenführungszylinder 1 vorgeordnet. Der Trommelkörper 4 (gemäß Fig. 1 und 2) ist, bezogen auf einen einfachgroßen Druckzylinder, mit einem zweifachgroßen Durchmesser ausgeführt und trägt somit zwei Greiferbrücken 6, 7. Am Umfang des Trommelkörpers 4 sind die Greiferbrücken 6, 7 symmetrisch verteilt angeordnet (180° versetzt). Jede Greiferbrücke 6 bzw. 7 besteht aus einer Greiferwelle, Greifern sowie mindestens einer Greiferaufschlagleiste. Die Greiferaufschlagleiste trägt für jeden Greifer zugeordnete Auflageklötzchen für die Einzelgreiferauflage. Der Trommelkörper 4 ist mit seinen beiden Wellenzapfen 15 drehbar in jeweils einer Lagerung eines Gestelles 14 aufgenommen.A sheet-guiding
Die fluchtenden Wellenzapfen 15 sind hohl ausgeführt. Jeder Zapfen 15 ist an einer Tragscheibe 16 fixiert, die pro Greiferbrücke 6, 7 mittels einem Greiferbalken 18 untereinander verbunden sind. An dem Greiferbalken 18 ist die komplette Greiferbrücke 6 bzw. 7 fixiert. Die Tragscheiben 16 sind zu einem Greiferhüllkreis 5 im wesentlichen als Sekante verlaufend ausgebildet. In den fluchtenden Wellenzapfen 15 ist konzentrisch eine gestellfeste Achse 8 angeordnet an der zwei Tragarme 17 fixiert sind. Die Tragarme 17 stützen eine die Tragarme 17 verbindende Blaseinrichtung 9. Der Blaseinrichtung sind mehrere Ventilatoren zur Blaslufterzeugung zugeordnet. Die Lufterzeugung kann auch über ein Pneumatiksystem mit externer Luftversorgung realisiert werden. Um einen Bogen 11 abschmierfrei auf dem Druckzylinder 2 zu führen wird von einem Blasrohr 10, welches der Blaseinrichtung 9 benachbart ist eine Luftströmung etwa tangential gegen den Druckzylinder 2 gerichtet erzeugt. Der hintere Teil des Bogens wird somit von einem Luftpolster gestützt. Dieses Blasrohr 10 hat eine externe Luftversorgung. Das Blasrohr 10 besitzt vorzugsweise mehrere über die Zylinderbreite verteilt angeordnete Öffnungen.The aligned
Die Wirkungsweise ist wie folgt: Der Bogen 11 wird vom Druckzylinder 2 an die Greiferbrücke 6 oder 7 des Trommelkörpers 4 übergeben. Der noch auf dem Druckzylinder 2 befindliche hintere Teil des Bogens 11 wird von einer aus dem Blasrohr 10 austretenden Luftströmung gestützt, so daß der Bogen 11 nicht mit dem Trommelkörper 4 in Berührung kommt. Abhängig von dem zu verarbeitenden Bedruckstoff oder auch von der Anordnung der Zylinder kann das Blasrohr 10 auch abschaltbar ausgeführt sein, so daß lediglich die Blaseinrichtung 9 die Bogenführung übernimmt. Die Blaseinrichtung 9 stützt nun den Bogen 11 durch die Luftströmung ab während die Greiferbrücke 6 oder 7 mit dem Bogen 11 sich in den Bogenabgang bewegt. Die Bogenleiteinrichtung 12 wird mit Blasluft beaufschlagt, so daß der beidseitig bedruckte Bogen 11 von beiden Seiten mit Luft angeströmt wird und berührungslos durch den Bogenabgang und den nachfolgenden Bogenaufgang geführt wird. Der Bogen 11 wird anschließend an den nachfolgenden Bogenführungszylinder 13 übergeben.The mode of operation is as follows: the
- 11
- BogenführungszylinderBow guide cylinder
- 22nd
- DruckzylinderImpression cylinder
- 33rd
- GummituchzylinderBlanket cylinder
- 44th
- TrommelkörperDrum body
- 55
- HüllkreisEnvelope circle
- 66
- GreiferbrückeGrab bridge
- 77
- GreiferbrückeGrab bridge
- 88th
- Achseaxis
- 99
- BlaseinrichtungBlowing device
- 1010th
- BlasrohrBlowpipe
- 1111
- Bogenbow
- 11
- 2 Bogenleiteinrichtung2 sheet guiding device
- 1313
- BogenführungszylinderBow guide cylinder
- 1414
- Gestellframe
- 1515
- WellenzapfenShaft journal
- 1616
- TragscheibeSupport disc
- 1717th
- TragarmBeam
- 1818th
- GreiferbalkenGripper bar
Claims (8)
- Sheet guiding drum arrangement for a printing press, preferably between printing units or further treating units, with a drum body (4) with at least one gripper bridge (6, 7) arranged on the periphery, as well as a sheet guiding unit (12) arranged adjacently, characterised in that the drum body (4) has roller trunnions (15) mounted arranged at the end faces in side frames (14) and two carrier discs (16) which are rotatably mounted with the roller trunnions (15) concentrically on a fixed axle (18) and connected by at least one circulating gripper bridge (6, 7), wherein on the axle (8) within the notional circle (15) described by the grippers, a blowing device (9) is fixed firmly with respect to the frame in order that the gripper bridges (6, 7) are rotatable and the sheet guiding device (12) neighbouring the blowing device (9) can be pneumatically loaded.
- Sheet guiding drum arrangement according to Claim 1, characterised in that the blowing device (9) is linked with fans or an external air supply.
- Sheet guiding drum arrangement according to Claim 1, characterised in that on the axle (8), two carrier arms (17) are fixed which are connected by the blowing device (9).
- Sheet guiding drum arrangement according to Claim 1 and 2, characterised in that the blowing device (9) has a substantially convex outer contour.
- Sheet guiding drum arrangement according to Claim 1, characterised in that the blowing device (9) additionally has at least one separate air outlet opening, the airstream from which is directed substantially tangentially against a prior arranged impression cylinder (2).
- Sheet guiding drum arrangement according to Claim 1, characterised in that neighbouring the blowing device (9) is a blowing tube (10), the airstream from which is directed substantially tangentially against the previously arranged impression cylinder (2).
- Sheet guiding drum arrangement according to Claim 1, characterised in that the sheet guiding unit (12) can be switched over from blowing to suction air.
- Sheet guiding drum arrangement according to Claim 1, characterised in that the carrier discs (16) run relative to the notional circle (5) essentially as secants.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4436955 | 1994-10-15 | ||
| DE4436955A DE4436955C2 (en) | 1994-10-15 | 1994-10-15 | Device for contactless sheet transport |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0706882A1 EP0706882A1 (en) | 1996-04-17 |
| EP0706882B1 true EP0706882B1 (en) | 1997-12-29 |
| EP0706882B2 EP0706882B2 (en) | 2001-01-17 |
Family
ID=6530903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95116073A Expired - Lifetime EP0706882B2 (en) | 1994-10-15 | 1995-10-12 | Sheet conveying drum for a printing machine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0706882B2 (en) |
| AT (1) | ATE161473T1 (en) |
| DE (2) | DE4436955C2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19629370A1 (en) * | 1996-07-20 | 1998-01-22 | Heidelberger Druckmasch Ag | Rotary printing machine with a device for treating the surface of sheets |
| DE19713361B4 (en) * | 1997-03-29 | 2007-12-27 | Heidelberger Druckmaschinen Ag | Method and apparatus for lubricating-free guidance of a printed sheet on a sheet-guiding cylinder of a printing press, in particular on a turning drum of a sheet-fed rotary offset printing press, in straight printing mode |
| ATE249384T1 (en) | 1998-12-03 | 2003-09-15 | Heidelberger Druckmasch Ag | BOOM OF A SHEET PROCESSING MACHINE |
| DE10042887A1 (en) | 2000-08-31 | 2002-03-14 | Heidelberger Druckmasch Ag | Sheet processing machine |
| JP4638165B2 (en) | 2003-07-16 | 2011-02-23 | ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフト | Machine for processing sheets |
| JP6384987B2 (en) * | 2014-05-22 | 2018-09-05 | 株式会社小森コーポレーション | Sheet-fed printing press |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE510456C (en) * | 1925-08-25 | 1930-10-18 | Albert Schnellpressen | Device for drying the printed sheets in multicolor rotogravure printing machines |
| DE725705C (en) * | 1941-01-25 | 1942-09-28 | Willy Mailaender | Rotary rubber printing machine for multi-colored printing of metal sheets |
| DE1102767B (en) * | 1958-08-21 | 1961-03-23 | Miehle Goss Dexter Inc | Sheet transport device on printing presses |
| US3334897A (en) * | 1965-05-25 | 1967-08-08 | Richard E Sharkey | Method and apparatus for controlling curvature in printed sheets being withdrawn from an impression cylinder |
| DE2017417B2 (en) * | 1970-04-11 | 1972-07-20 | Maschf Augsburg Nuernberg Ag | Sheet transfer drum on sheet-fed rotary offset printing machines |
| DE2914362C3 (en) * | 1979-04-09 | 1984-12-20 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | Sheet transport drum on rotary printing machines |
| DD228795A1 (en) † | 1984-11-19 | 1985-10-23 | Polygraph Leipzig | ARC DIRECTION IN THE OUTLET DRIVE AREA OF PRINTING MACHINES |
| DD229360A1 (en) * | 1984-11-27 | 1985-11-06 | Polygraph Leipzig | BLOW AIR DRUM AS TRANSMISSION DRIVE AND DRIVE DRUM ON ARC MACHINES |
| DD242028A1 (en) † | 1985-10-31 | 1987-01-14 | Polygraph Leipzig | DRYING DEVICE IN PRINTING MACHINES |
| DE3602084A1 (en) * | 1986-01-24 | 1987-07-30 | Heidelberger Druckmasch Ag | BOW TRANSFER DRUM BETWEEN THE PRINTING UNITS OF ROTATIONAL PRINTING MACHINES |
| DE3717093A1 (en) † | 1987-05-21 | 1988-12-08 | Heidelberger Druckmasch Ag | BOW ROTATION PRINTING MACHINE FOR THE PRODUCTION OF SINGLE-SIDED MULTICOLOR PRINTING OR BEAUTIFUL AND REPRINTING |
| DE4244499C2 (en) * | 1992-12-30 | 1995-04-06 | Heidelberger Druckmasch Ag | Printing machine with sheet guiding surface |
-
1994
- 1994-10-15 DE DE4436955A patent/DE4436955C2/en not_active Expired - Fee Related
-
1995
- 1995-10-12 AT AT95116073T patent/ATE161473T1/en not_active IP Right Cessation
- 1995-10-12 DE DE59501163T patent/DE59501163D1/en not_active Expired - Fee Related
- 1995-10-12 EP EP95116073A patent/EP0706882B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4436955A1 (en) | 1996-04-18 |
| DE59501163D1 (en) | 1998-02-05 |
| ATE161473T1 (en) | 1998-01-15 |
| DE4436955C2 (en) | 1999-11-11 |
| EP0706882B2 (en) | 2001-01-17 |
| EP0706882A1 (en) | 1996-04-17 |
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