EP0725026A2 - Device for avoiding register errors - Google Patents

Device for avoiding register errors Download PDF

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Publication number
EP0725026A2
EP0725026A2 EP96100455A EP96100455A EP0725026A2 EP 0725026 A2 EP0725026 A2 EP 0725026A2 EP 96100455 A EP96100455 A EP 96100455A EP 96100455 A EP96100455 A EP 96100455A EP 0725026 A2 EP0725026 A2 EP 0725026A2
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EP
European Patent Office
Prior art keywords
gripper
sheet
gripper bridge
feed cylinder
bridge
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.)
Granted
Application number
EP96100455A
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German (de)
French (fr)
Other versions
EP0725026A3 (en
EP0725026B1 (en
Inventor
Lothar Stadler
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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Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0725026A2 publication Critical patent/EP0725026A2/en
Publication of EP0725026A3 publication Critical patent/EP0725026A3/en
Application granted granted Critical
Publication of EP0725026B1 publication Critical patent/EP0725026B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F21/00Devices for conveying sheets through printing apparatus or machines
    • B41F21/04Grippers
    • B41F21/05In-feed grippers

Definitions

  • the invention relates to a device for avoiding register errors on a vibrating pre-gripper, the gripper bridge being bent in time with the machine in such a way that each sheet is stretched in its rear region.
  • the object of the invention is to achieve, in a device of the type mentioned at the outset, an extension of the rear region of the sheet in a simple manner with a pre-gripper suspended and driven in the middle.
  • the object is achieved in that the gripper bridge is rigid and driven in its central region, that a feed cylinder carries thrust pieces on both sides that bend the gripper bridge at its ends in the direction of sheet travel before each sheet transfer to the feed cylinder and that the bend to the completed sheet transfer is maintained.
  • the sheet is thus stretched in the outer areas of its front edge, which causes the rear sheet area to be stretched in width, that is to say transversely to the direction of sheet travel.
  • This stretching of the sheet end in the width means that there is no significant rolling out of the sheet and thus also no significant tight printing.
  • the bending of the gripper bridge does not take place immediately after the sheet has been taken over by the feeder, but shortly before the sheet is transferred to the feed cylinder. Instead of the middle area of the gripper bridge, its ends are bent, so that the guide and drive of the gripper bridge can be relocated to the center thereof. In this way, the suspension and drive can be designed more simply and cost-effectively, and the space required for suspension and drive of the gripper bridge of the pre-gripper is also reduced.
  • the pressure pieces can be adjustably suspended on the feed cylinder, for example an adjusting spindle and a clamping screw can be provided.
  • the gripper bridge carries stops which interact with the pressure pieces and that these stops are adjustable.
  • the feed cylinder is adjustable in the circumferential direction, the drive of the gripper bridge being decoupled from the drive of the feed cylinder.
  • the setting can be made in a manner similar to a circumferential register setting.
  • the gripper bridge can additionally be guided on its sides by flexible supports.
  • FIG. 1 and 2 show a schematic representation to explain the function of the device according to the invention.
  • FIG. 1 shows a sheet 3 after it has been gripped by a series of grippers 12 of a gripper bridge 2. In this state, the gripper bridge 2 has not yet been bent and the sheet 3 has not yet been stretched.
  • Fig. 2 shows the extension of the arch 3 through the bend of the gripper bridge 2.
  • the bend is shown exaggerated, in fact it is a few hundredths of a millimeter. This bending takes place in such a way that the gripper bridge 2 is bent at its ends in such a way that the gripper bridge 2 is curved in the direction of the arch 3.
  • forces act on the bow 3, which are symbolized by the arrows 15.
  • these are increasing tensile forces in the direction of the edges.
  • forces occur at the rear end of the bow which cause an extension in the direction of the bow width, as is symbolized by the two arrows 15 pointing sideways.
  • the gripper bridge 2 of the pre-gripper 1 is rigidly connected to a shaft 11 by means of a housing 8 and carries out an oscillating movement about this shaft 11.
  • the drive takes place via the drive toothed wheels 9, a drive shaft 16 and a drive device 10, which is designed, for example, as a cam drive.
  • a feed cylinder 4 also carries a gripper bridge, not shown, which interacts with the gripper bridge of the pre-gripper 1 such that it takes over the sheets individually and transports them further.
  • the pre-gripper 1 takes over the sheets 3 through its gripper bridge 2 from the feeder of the printing machine, not shown.
  • the feed cylinder 4 carries at its outer ends segmented pressure pieces 5, which cooperate with stops 6 of the gripper bridge 2 such that the gripper bridge 2 is impressed before each sheet transfer, which leads to the desired stretching of the sheet 3.
  • Either the pressure pieces 5 or the stops 6 can be adjustable.
  • the pressure pieces 5 are adjustable, as symbolized by the elongated holes.
  • the illustration shows two additional supports 7, which serve to better guide the gripper bridge 2.
  • the supports 7 must be designed to be flexible so that they allow the gripper bridge 2 to bend.
  • Fig. 4 shows the embodiment in side view.
  • the front mark 14 of the feeder is drawn here, against which the sheets 3 strike and at which they are gripped by the gripper bridge 2 of the pre-gripper 1.
  • the grippers 17 are shown on the feed cylinder 4, which are also designed as a row of grippers, similar to that already shown in FIG. 1 with the pre-gripper 1.
  • these grippers 17 are arranged in such a way that they reach through between the grippers 12 during the sheet transfer and can thereby grasp the sheet 3 before it is released by the grippers 12.
  • the function of the illustrated embodiment is as follows: A sheet 3 coming from the feeder abuts the front mark 14 and is gripped there by the grippers 12 of the gripper bridge 2 of the pre-gripper 1. This pre-gripper 1 moves along the dash-dotted line 19. The gripper 12 rotates at the same time that the grippers 12 move up to the transfer line 18 of the sheet 3 Feed cylinder 4 such that the grippers 17 are in the same transfer position and can take over the sheet 3. The above-described bending of the gripper bridge 2 by the pressure pieces 5 and the stops 6 must take place in an area before the grippers 12 and the grippers 17 have reached the transfer line 18 of the sheet 3.

Landscapes

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

Abstract

Die Erfindung betrifft eine Vorrichtung zur Vermeidung von Passerfehlern an einem schwingenden Vorgreifer (1), wobei die Greiferbrücke (2) im Takt der Maschine derart gebogen wird, daß jeder Bogen (3) eine Streckung in seinem hinteren Bereich erfährt. Diese Streckung des Bogens (3) in seinem hinteren Bereich wird bei einem mittig angetriebenen Vorgreifer (1) auf einfache Weise dadurch erreicht, daß die Greiferbrücke (2) in ihrem mittleren Bereich biegesteif geführt und angetrieben ist, wobei ein Zuführzylinder (4) beidseitig Druckstücke (5) trägt, die vor jeder Bogenübergabe an den Zuführzylinder (4) die Greiferbrücke (2) an ihren Enden in Bogenlaufrichtung biegen und die Biegung bis zur abgeschlossenen Bogenübergabe aufrechterhalten bleibt. <IMAGE>The invention relates to a device for avoiding register errors on a vibrating pre-gripper (1), the gripper bridge (2) being bent in time with the machine in such a way that each arch (3) is stretched in its rear region. This stretching of the sheet (3) in its rear region is achieved in a centrally driven pre-gripper (1) in a simple manner in that the gripper bridge (2) is guided and driven in a flexurally rigid manner in its central region, with a feed cylinder (4) thrust pieces on both sides (5) carries, before each sheet transfer to the feed cylinder (4) bend the gripper bridge (2) at its ends in the direction of sheet travel and the bend is maintained until the sheet transfer is completed. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zur Vermeidung von Passerfehlern an einem schwingenden Vorgreifer, wobei die Greiferbrücke im Takt der Maschine derart gebogen wird, daß jeder Bogen eine Streckung in seinem hinteren Bereich erfährt.The invention relates to a device for avoiding register errors on a vibrating pre-gripper, the gripper bridge being bent in time with the machine in such a way that each sheet is stretched in its rear region.

Das zu bewältigende technische Problem besteht darin, daß sich Papierbögen beim Drucken in Mehrfarbenmaschinen in jedem Druckwerk mehr auswalzen, wodurch die Passer der nachfolgenden Farben am Bogenende zunehmend vom ersten Druck abweichen. Dieser Effekt wird "Engerdrucken" genannt, da der Eindruck entsteht, daß die nachfolgenden Farben enger gedruckt sind als die erste Farbe. Tatsächlich streckt sich das Ende des Papierbogens bei jedem Druck etwas mehr in die Breite. Diesem Effekt kann entgegengewirkt werden, indem der hintere Bereich eines Bogens vor dem Bedrucken gestreckt wird.The technical problem to be overcome is that sheets of paper roll out more in each printing unit when printing in multi-color machines, as a result of which the registers of the subsequent colors at the end of the sheet increasingly deviate from the first print. This effect is called "close printing" because it creates the impression that the subsequent colors are printed more closely than the first color. In fact, the end of the sheet of paper stretches a little more with each print. This effect can be counteracted by stretching the rear area of a sheet before printing.

Aus der DE-G 88 16 641.4 ist eine Vorrichtung der eingangs genannten Art bekannt. Bei dieser Vorrichtung wird der Vorgreifer vor dem Ergreifen des vom Anleger zugeführten Bogens derart gebogen, daß dieser im mittleren Bereich vom Bogen wegweisend gewölbt ist. Dies wird durch einen mittigen Anschlag am Tisch des Anlegers erreicht, der der Greiferbrücke diese Biegung aufprägt. Nach dem Ergreifen des Bogens biegt sich die Greiferbrücke zurück und streckt dadurch den Bogen in seinem hinteren Bereich. Bei dieser Vorrichtung muß der Antrieb der Greiferbrücke des schwingenden Vorgreifers derart erfolgen, daß die Greiferbrücke an ihren Enden durch den Antrieb stabil geführt ist. Es sind also beidseitig stabile Verbindungen zwischen der Welle und der Greiferbrücke erforderlich, was aufwendig und teuer ist.From DE-G 88 16 641.4 a device of the type mentioned is known. In this device, the pre-gripper is bent before gripping the sheet fed by the feeder in such a way that it is curved to point away from the sheet in the central region. This is achieved by a central stop on the table of the feeder, which imprints this bend on the gripper bridge. After gripping the arch, the gripper bridge bends back and thereby stretches the arch in its rear area. In this device, the gripper bridge of the vibrating pre-gripper must be driven in such a way that the gripper bridge is stably guided at its ends by the drive is. Stable connections between the shaft and the gripper bridge are therefore required on both sides, which is complex and expensive.

Der Erfindung liegt die Aufgabe zugrunde, bei einer Vorrichtung der eingangs genannten Art eine Streckung des hinteren Bereichs des Bogens bei einem mittig aufgehängten und angetriebenen Vorgreifer auf einfache Weise zu erzielen.The object of the invention is to achieve, in a device of the type mentioned at the outset, an extension of the rear region of the sheet in a simple manner with a pre-gripper suspended and driven in the middle.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Greiferbrücke in ihrem mittleren Bereich biegesteif geführt und angetrieben ist, daß ein Zuführzylinder beidseitig Druckstücke trägt, die vor jeder Bogenübergabe an den Zuführzylinder die Greiferbrücke an ihren Enden in Bogenlaufrichtung biegen und daß die Biegung bis zur abgeschlossenen Bogenübergabe aufrechterhalten bleibt.The object is achieved in that the gripper bridge is rigid and driven in its central region, that a feed cylinder carries thrust pieces on both sides that bend the gripper bridge at its ends in the direction of sheet travel before each sheet transfer to the feed cylinder and that the bend to the completed sheet transfer is maintained.

Wie beim Stand der Technik wird also der Bogen in den äußeren Bereichen seiner Vorderkante gestreckt, wodurch es zu einer Streckung des hinteren Bogenbereichs in die Breite, also quer zur Bogenlaufrichtung, kommt. Diese Streckung des Bogenendes in die Breite bewirkt, daß kein nennenswertes Auswalzen des Bogens und damit auch kein nennenswertes Engerdrucken stattfindet. Im Gegensatz zum genannten Stand der Technik findet jedoch bei der erfindungsgemäßen Vorrichtung das Biegen der Greiferbrücke nicht unmittelbar nach der Übernahme des Bogens vom Anleger statt, sondern kurz vor der Übergabe des Bogens an den Zuführzylinder. Es werden statt des mittleren Bereichs der Greiferbrücke deren Enden gebogen, wodurch Führung und Antrieb der Greiferbrücke in die Mitte derselben verlegt werden können. Aufhängung und Antrieb lassen sich auf diese weise einfacher und kostengünstiger ausgestalten, wobei zusätzlich der Raumbedarf für Aufhängung und Antrieb der Greiferbrücke des Vorgreifers verringert wird.As in the prior art, the sheet is thus stretched in the outer areas of its front edge, which causes the rear sheet area to be stretched in width, that is to say transversely to the direction of sheet travel. This stretching of the sheet end in the width means that there is no significant rolling out of the sheet and thus also no significant tight printing. In contrast to the prior art mentioned, in the device according to the invention the bending of the gripper bridge does not take place immediately after the sheet has been taken over by the feeder, but shortly before the sheet is transferred to the feed cylinder. Instead of the middle area of the gripper bridge, its ends are bent, so that the guide and drive of the gripper bridge can be relocated to the center thereof. In this way, the suspension and drive can be designed more simply and cost-effectively, and the space required for suspension and drive of the gripper bridge of the pre-gripper is also reduced.

Weiterbildungen sehen vor, die Vorrichtung zu justieren, wobei verschiedene Möglichkeiten bestehen: Es können die Druckstücke verstellbar am Zuführzylinder aufgehängt sein, beispielsweise können jeweils eine Stellspindel und eine Klemmschraube vorgesehen sein. Es ist jedoch auch möglich, daß die Greiferbrücke mit den Druckstücken zusammenwirkende Anschläge trägt und daß diese Anschläge verstellbar sind. Eine weitere Möglichkeit besteht darin, daß der Zuführzylinder in Umfangsrichtung verstellbar ist, wobei der Antrieb der Greiferbrücke vom Antrieb des Zuführzylinders entkoppelt ist. Dadurch kann die Einstellung in ähnlicher Weise wie eine Umfangsregistereinstellung erfolgen. Selbstverständlich ist es möglich, diese Verstellungen mittels einer Fernverstellung, also beispielsweise vom Steuerpult der Druckmaschine vorzunehmen.Further developments provide for the device to be adjusted, there being various possibilities: the pressure pieces can be adjustably suspended on the feed cylinder, for example an adjusting spindle and a clamping screw can be provided. However, it is also possible that the gripper bridge carries stops which interact with the pressure pieces and that these stops are adjustable. Another possibility is that the feed cylinder is adjustable in the circumferential direction, the drive of the gripper bridge being decoupled from the drive of the feed cylinder. As a result, the setting can be made in a manner similar to a circumferential register setting. Of course, it is possible to make these adjustments by means of remote adjustment, for example from the control panel of the printing press.

Selbstverständlich sind weitere Ausgestaltungen und Weiterbildungen denkbar, beispielsweise kann die Greiferbrücke an ihren Seiten zusätzlich durch biegeweiche Stützen geführt sein.Of course, further refinements and developments are conceivable, for example the gripper bridge can additionally be guided on its sides by flexible supports.

Nachfolgend wird die Erfindung anhand der Zeichnung erläutert. Es zeigen

Fig. 1
ein von der Greiferbrücke erfaßter Bogen,
Fig. 2
die Streckung des Bogens,
Fig. 3
ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung
und
Fig. 4
das Ausführungsbeispiel in Seitenansicht.
The invention is explained below with reference to the drawing. Show it
Fig. 1
an arch gripped by the gripper bridge,
Fig. 2
the extension of the bow,
Fig. 3
an embodiment of the device according to the invention
and
Fig. 4
the embodiment in side view.

Fig. 1 und 2 zeigen eine schematische Darstellung zur Erläuterung der Funktion der erfindungsgemäßen Vorrichtung.1 and 2 show a schematic representation to explain the function of the device according to the invention.

Fig. 1 zeigt einen Bogen 3 nach der Erfassung durch eine Reihe von Greifern 12 einer Greiferbrücke 2. In diesem Zustand ist die Greiferbrücke 2 noch nicht gebogen und der Bogen 3 ist noch nicht gestreckt.1 shows a sheet 3 after it has been gripped by a series of grippers 12 of a gripper bridge 2. In this state, the gripper bridge 2 has not yet been bent and the sheet 3 has not yet been stretched.

Fig. 2 zeigt die Streckung des Bogens 3 durch die Biegung der Greiferbrücke 2. Die Biegung ist stark übertrieben dargestellt, tatsächlich handelt es sich um wenige hundertstel Millimeter. Diese Biegung findet derart statt, daß die Greiferbrücke 2 an ihren Enden derart gebogen wird, daß eine wölbung der Greiferbrücke 2 in Richtung des Bogens 3 stattfindet. Dadurch wirken Kräfte auf den Bogen 3, die durch die Pfeile 15 symbolisiert werden. Im Bereich der Bogenvorderkante sind dies in Richtung der Ränder zunehmende Zugkräfte. In der Mitte wirken keine Zugkräfte. Durch diese Zugkräfte treten am hinteren Ende des Bogens Kräfte auf, die eine Streckung in Richtung der Bogenbreite bewirken, wie dies durch die zwei seitwärts gerichteten Pfeile 15 symbolisiert ist.Fig. 2 shows the extension of the arch 3 through the bend of the gripper bridge 2. The bend is shown exaggerated, in fact it is a few hundredths of a millimeter. This bending takes place in such a way that the gripper bridge 2 is bent at its ends in such a way that the gripper bridge 2 is curved in the direction of the arch 3. As a result, forces act on the bow 3, which are symbolized by the arrows 15. In the area of the leading edge of the sheet, these are increasing tensile forces in the direction of the edges. There are no tensile forces in the middle. As a result of these tensile forces, forces occur at the rear end of the bow which cause an extension in the direction of the bow width, as is symbolized by the two arrows 15 pointing sideways.

Die Fig. 3 und 4 zeigen ein Ausführungsbeispiel der Erfindung.3 and 4 show an embodiment of the invention.

Fig. 3 zeigt eine räumliche Darstellung. Die Greiferbrücke 2 des Vorgreifers 1 ist mittels eines Gehäuses 8 biegesteif mit einer Welle 11 verbunden und führt eine schwingende Bewegung um diese Welle 11 aus. Der Antrieb erfolgt über die Antriebszahnräder 9, eine Antriebswelle 16 sowie eine Antriebseinrichtung 10, die beispielsweise als Kurvenantrieb ausgebildet ist. Ein Zuführzylinder 4 trägt ebenfalls eine nicht dargestellte Greiferbrücke, die mit der Greiferbrücke des Vorgreifers 1 derart zusammenwirkt, daß sie die Bögen einzeln übernimmt und weitertransportiert. Der Vorgreifer 1 übernimmt die Bögen 3 durch seine Greiferbrücke 2 vom nicht dargestellten Anleger der Druckmaschine. Der Zuführzylinder 4 trägt an seinen äußeren Enden segmentförmig ausgebildete Druckstücke 5, welche mit Anschlägen 6 der Greiferbrücke 2 derart zusammenwirken, daß der Greiferbrücke 2 vor jeder Bogenübergabe eine Biegung aufgeprägt wird, die zu der gewünschten Streckung des Bogens 3 führt. Es können wahlweise entweder die Druckstücke 5 oder die Anschläge 6 verstellbar sein. Im dargestellten Ausführungsbeispiel sind die Druckstücke 5 verstellbar, wie dies durch die Langlöcher symbolisiert ist. Die Darstellung zeigt zwei zusätzliche Stützen 7, die einer besseren Führung der Greiferbrücke 2 dienen. Die Stützen 7 müssen derart biegeweich ausgeführt sein, daß sie die Biegung der Greiferbrücke 2 zulassen.3 shows a spatial representation. The gripper bridge 2 of the pre-gripper 1 is rigidly connected to a shaft 11 by means of a housing 8 and carries out an oscillating movement about this shaft 11. The drive takes place via the drive toothed wheels 9, a drive shaft 16 and a drive device 10, which is designed, for example, as a cam drive. A feed cylinder 4 also carries a gripper bridge, not shown, which interacts with the gripper bridge of the pre-gripper 1 such that it takes over the sheets individually and transports them further. The pre-gripper 1 takes over the sheets 3 through its gripper bridge 2 from the feeder of the printing machine, not shown. The feed cylinder 4 carries at its outer ends segmented pressure pieces 5, which cooperate with stops 6 of the gripper bridge 2 such that the gripper bridge 2 is impressed before each sheet transfer, which leads to the desired stretching of the sheet 3. Either the pressure pieces 5 or the stops 6 can be adjustable. In the illustrated embodiment, the pressure pieces 5 are adjustable, as symbolized by the elongated holes. The illustration shows two additional supports 7, which serve to better guide the gripper bridge 2. The supports 7 must be designed to be flexible so that they allow the gripper bridge 2 to bend.

Fig. 4 zeigt das Ausführungsbeispiel in Seitenansicht. Zu den bereits erwähnten Teilen ist hier zusätzlich die Vordermarke 14 des Anlegers gezeichnet, an der die Bögen 3 anschlagen und an der sie von der Greiferbrücke 2 des Vorgreifers 1 ergriffen werden. Außerdem sind an dem Zuführzylinder 4 die Greifer 17 eingezeichnet, die ebenfalls als Greiferreihe ausgeführt sind, ähnlich wie dies bereits in Fig. 1 anhand des Vorgreifers 1 dargestellt ist. Jedoch sind diese Greifer 17 derart angeordnet, daß sie bei der Bogenübergabe zwischen die Greifer 12 hindurchgreifen und dadurch den Bogen 3 erfassen können, bevor dieser von den Greifern 12 losgelassen wird.Fig. 4 shows the embodiment in side view. In addition to the parts already mentioned, the front mark 14 of the feeder is drawn here, against which the sheets 3 strike and at which they are gripped by the gripper bridge 2 of the pre-gripper 1. In addition, the grippers 17 are shown on the feed cylinder 4, which are also designed as a row of grippers, similar to that already shown in FIG. 1 with the pre-gripper 1. However, these grippers 17 are arranged in such a way that they reach through between the grippers 12 during the sheet transfer and can thereby grasp the sheet 3 before it is released by the grippers 12.

Die Funktion des dargestellten Ausführungsbeispiels ist folgende:
Ein Bogen 3 stößt von dem Anleger kommend an der Vordermarke 14 an und wird dort von den Greifern 12 der Greiferbrücke 2 des Vorgreifers 1 ergriffen. Dieser Vorgreifer 1 bewegt sich entlang der strichpunktierten Linie 19. In derselben Zeit, in der die Greifer 12 sich bis zur Übergabelinie 18 des Bogens 3 bewegen, dreht sich der Zuführzylinder 4 derart, daß sich die Greifer 17 in derselben Übergabeposition befinden und den Bogen 3 übernehmen können. Die oben beschriebene Biegung der Greiferbrücke 2 durch die Druckstücke 5 und die Anschläge 6 muß in einem Bereich stattfinden, bevor die Greifer 12 und die Greifer 17 die Übergabelinie 18 des Bogens 3 erreicht haben. Auf diese Weise wird dem Bogen 3 die beschriebene Streckung aufgeprägt und diese Streckung bleibt auch erhalten, nachdem die Greifer 17 den Bogen 3 von den Greifern 12 übernommen haben. In dieser Weise wird bei der Übergabe des Bogens 3 von einer Greiferbrücke zur nächsten der Bogen 3 auf seinem Weg durch die Druckmaschine immer mit der aufgeprägten Streckung übergeben, wodurch verhindert wird, daß es zu der Auswalzung der Bögen 3 kommt, welche den Effekt des Engerdruckens herbeiführt.
The function of the illustrated embodiment is as follows:
A sheet 3 coming from the feeder abuts the front mark 14 and is gripped there by the grippers 12 of the gripper bridge 2 of the pre-gripper 1. This pre-gripper 1 moves along the dash-dotted line 19. The gripper 12 rotates at the same time that the grippers 12 move up to the transfer line 18 of the sheet 3 Feed cylinder 4 such that the grippers 17 are in the same transfer position and can take over the sheet 3. The above-described bending of the gripper bridge 2 by the pressure pieces 5 and the stops 6 must take place in an area before the grippers 12 and the grippers 17 have reached the transfer line 18 of the sheet 3. In this way, the stretching described is impressed on the sheet 3 and this stretching is retained even after the grippers 17 have taken over the sheet 3 from the grippers 12. In this way, when the sheet 3 is transferred from one gripper bridge to the next, the sheet 3 is always passed with the embossed stretching on its way through the printing machine, thereby preventing the sheets 3 from being rolled out, which has the effect of tight printing brings about.

Vorrichtung zur Vermeidung von PasserfehlernDevice for avoiding register errors BEZUGSZEICHENLISTEREFERENCE SIGN LIST

11
VorgreiferForerunner
22nd
GreiferbrückeGrab bridge
33rd
Bogenbow
44th
ZuführzylinderFeed cylinder
55
DruckstückeThrust pieces
66
Anschlägeattacks
77
biegeweiche Stützenflexible supports
88th
Gehäusecasing
99
AntriebszahnräderDrive gears
1010th
AntriebseinrichtungDrive device
1111
Welle des VorgreifersWave of the forerunner
1212th
GreiferGripper
1313
GreiferauflageGripper pad
1414
VordermarkeFront mark
15, 15'15, 15 '
Pfeile, die Streckung des Bogens symbolisierendArrows symbolizing the stretch of the bow
1616
Antriebswelledrive shaft
1717th
Greifer des ZuführzylindersFeed cylinder gripper
1818th
Übergabelinie des BogensTransfer line of the bow
1919th
Weg der GreiferbrückePath of the grapple bridge

Claims (6)

Vorrichtung zur Vermeidung von Passerfehlern an einem schwingenden Vorgreifer (1), wobei die Greiferbrücke (2) im Takt der Maschine derart gebogen wird, daß jeder Bogen (3) eine Streckung in seinem hinteren Bereich erfährt,
dadurch gekennzeichnet,
daß die Greiferbrücke (2) in ihrem mittleren Bereich biegesteif geführt und angetrieben ist,
daß ein Zuführzylinder (4) beidseitig Druckstücke (5) trägt, die vor jeder Bogenübergabe an den Zuführzylinder (4) die Greiferbrücke (2) an ihren Enden in Bogenlaufrichtung biegen und
daß die Biegung bis zur abgeschlossenen Bogenübergabe aufrechterhalten bleibt.
Device for avoiding register errors on a vibrating pre-gripper (1), the gripper bridge (2) being bent in time with the machine in such a way that each arch (3) is stretched in its rear region,
characterized by
that the gripper bridge (2) is rigidly guided and driven in its central region,
that a feed cylinder (4) carries thrust pieces (5) on both sides, which bend the gripper bridge (2) at its ends in the direction of sheet travel before each sheet transfer to the feed cylinder (4)
that the bend is maintained until the sheet transfer is completed.
Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Druckstücke (5) verstellbar sind.
Device according to claim 1,
characterized by
that the pressure pieces (5) are adjustable.
Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Greiferbrücke (2) mit den Druckstücken (5) zusammenwirkende Anschläge (6) trägt und daß die Anschläge (6) verstellbar sind.
Device according to claim 1,
characterized by
that the gripper bridge (2) with the pressure pieces (5) cooperating stops (6) and that the stops (6) are adjustable.
Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der Zuführzylinder (4) in Umfangsrichtung verstellbar ist, wobei der Antrieb der Greiferbrücke (2) vom Antrieb des Zuführzylinders (4) entkoppelt ist.
Device according to claim 1,
characterized by
that the feed cylinder (4) is adjustable in the circumferential direction, the drive of the gripper bridge (2) being decoupled from the drive of the feed cylinder (4).
Vorrichtung nach einem der Ansprüche 2 bis 4,
gekennzeichnet durch
eine Fernverstellung.
Device according to one of claims 2 to 4,
marked by
a remote adjustment.
Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß die Greiferbrücke (2) an ihren Seiten zusätzlich durch biegeweiche Stützen (7) geführt ist.
Device according to one or more of claims 1 to 5,
characterized by
that the gripper bridge (2) is additionally guided on its sides by flexible supports (7).
EP96100455A 1995-02-04 1996-01-13 Device for avoiding register errors Expired - Lifetime EP0725026B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19503739A DE19503739C1 (en) 1995-02-04 1995-02-04 Registration error prevention device for pre=gripper of chain gripper bar
DE19503739 1995-02-04

Publications (3)

Publication Number Publication Date
EP0725026A2 true EP0725026A2 (en) 1996-08-07
EP0725026A3 EP0725026A3 (en) 1997-08-13
EP0725026B1 EP0725026B1 (en) 1998-08-26

Family

ID=7753223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100455A Expired - Lifetime EP0725026B1 (en) 1995-02-04 1996-01-13 Device for avoiding register errors

Country Status (4)

Country Link
US (1) US5651544A (en)
EP (1) EP0725026B1 (en)
JP (1) JPH08244207A (en)
DE (2) DE19503739C1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19600793C2 (en) * 1996-01-11 1999-12-02 Heidelberger Druckmasch Ag Device for aligning sheets on the feed table of a sheet printing machine
DE19611124B4 (en) * 1996-03-21 2012-07-26 Heidelberger Druckmaschinen Ag Sheet transfer device of a sheet-fed rotary printing machine
DE19616755C2 (en) * 1996-04-26 1999-12-16 Heidelberger Druckmasch Ag Drive for a vibrating pre-gripper of a sheet printing machine
EP1142710B1 (en) * 2000-04-03 2007-11-28 Heidelberger Druckmaschinen Aktiengesellschaft Sheet-fed printing machines and method for driving a sheet-fed printing machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833213A (en) * 1972-04-17 1974-09-03 Rockwell International Corp Means for overcoming fan-out in lithograph press
EP0372237A2 (en) * 1988-12-03 1990-06-13 Heidelberger Druckmaschinen Aktiengesellschaft Device for register correction of the overprinting of sheets in a rotary sheet-fed press

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125022A (en) * 1964-03-17 Registering adjustment for multi-color printing
US2286032A (en) * 1941-02-11 1942-06-09 Hoe & Co R Sheet registering mechanism for printing machines
DE1259904B (en) * 1964-12-17 1968-02-01 Roland Offsetmaschf Device on the sheet guiding devices of a multi-color sheet-fed rotary printing press for influencing the registration of the prints
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
DE1909795C2 (en) * 1969-02-27 1973-10-18 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Device on sheet transfer drums of multi-color sheet-fed rotary printing presses for register correction by deforming the leading edge of the sheet
US3623721A (en) * 1969-10-27 1971-11-30 North American Rockwell Means for overcoming fan-out in lithographic press
DE3112964A1 (en) * 1981-04-01 1982-10-21 Heidelberger Druckmaschinen Ag, 6900 Heidelberg "BOW TRANSFER CYLINDER OF ARC ROTATION PRINTING MACHINES WITH A DEVICE FOR FIXING THE PRINTERS"
DE3721900A1 (en) * 1987-07-02 1989-01-19 Heidelberger Druckmasch Ag REMOTE-CONTROLLED ADJUSTMENTS FOR THE ELASTIC DEFORMING OF A REGISTER RAIL
US5176079A (en) * 1988-12-03 1993-01-05 Heidelberger Druckmaschinen Ag Device for correcting the register of sheet overprints in a sheet-fed rotary printing machine
DE3843152A1 (en) * 1988-12-22 1990-06-28 Heidelberger Druckmasch Ag DEVICE FOR ALIGNING THE FRONT EDGE OF ARC
JP3339515B2 (en) * 1993-08-12 2002-10-28 株式会社小森コーポレーション Paper transport device for sheet-fed printing press

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833213A (en) * 1972-04-17 1974-09-03 Rockwell International Corp Means for overcoming fan-out in lithograph press
EP0372237A2 (en) * 1988-12-03 1990-06-13 Heidelberger Druckmaschinen Aktiengesellschaft Device for register correction of the overprinting of sheets in a rotary sheet-fed press

Also Published As

Publication number Publication date
DE59600461D1 (en) 1998-10-01
DE19503739C1 (en) 1996-04-04
US5651544A (en) 1997-07-29
JPH08244207A (en) 1996-09-24
EP0725026A3 (en) 1997-08-13
EP0725026B1 (en) 1998-08-26

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