EP0476244B1 - Gripper finger of a sheet-fed printing machine gripper shaft - Google Patents

Gripper finger of a sheet-fed printing machine gripper shaft Download PDF

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Publication number
EP0476244B1
EP0476244B1 EP91110641A EP91110641A EP0476244B1 EP 0476244 B1 EP0476244 B1 EP 0476244B1 EP 91110641 A EP91110641 A EP 91110641A EP 91110641 A EP91110641 A EP 91110641A EP 0476244 B1 EP0476244 B1 EP 0476244B1
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EP
European Patent Office
Prior art keywords
gripper
gripper finger
force
shaft
compression spring
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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EP91110641A
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German (de)
French (fr)
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EP0476244A1 (en
Inventor
Claus D. Simeth
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication of EP0476244A1 publication Critical patent/EP0476244A1/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
    • B41F21/104—Gripper details

Definitions

  • the invention relates to a gripper finger of a gripper shaft of a sheet-fed printing press with a first compression spring with adjustable spring force, which exerts a force approximately in the direction of the transfer point of the gripper pad, furthermore with an adjusting screw resting with its tip on a support plane, which likewise has a force approximately in the direction of the transfer point exerts the gripper pad, the arrangement being such that it is a vector resulting from the two forces, which connects approximately the center of the gripper shaft approximately to the transfer point.
  • a gripper finger with these features which has proven itself in and of itself, is described in DE 36 32 768 C1.
  • a particular advantage of this known gripper finger, of which the present invention also makes use, is that the resulting forces occurring during operation pass through the center of the gripper, namely more or less in a line that connects the center of the gripper shaft with the transfer point of the gripper support . This gives the very important advantage that there is practically no play change in the different operating states, compared to other known gripper fingers which do not make use of this principle.
  • gripper fingers are subject to relatively high wear.
  • the gripper shaft must be removed completely and only then can the gripper fingers be removed from the gripper shaft.
  • this is labor intensive and leads to unacceptable long downtimes of the machine today.
  • the gripper finger described there is constructed in two parts, it consisting of a lower gripper finger part and an upper gripper finger part located directly above it, the ends of which are adjacent to the transfer point and are spread by a compression spring. At the other ends there is a set screw that regulates the distance between the two parts of the gripper fingers. Both gripper finger parts are fastened to the gripper shaft by a screw which passes through a hole in the upper gripper finger part and which is screwed into a thread in the gripper shaft.
  • the lower gripper finger part has a recess with a cylindrical part profile such that it bears against the gripper shaft from the same side (top side), where the upper gripper finger part is also arranged.
  • This known gripper finger has the advantage of easy assembly and disassembly, because only the fastening screw has to be loosened for this, but there is a large play change when opening and closing the gripper and therefore a displacement of the gripper tip, the extent of which depends on the wear of the gripper bearing. This wear and the change of game have the consequence that the sheets duplicate.
  • the prior art is also referred to DE-PS 11 74 804, which shows a gripper finger, the body spans an opening of about 180 °, so that the gripper finger can be placed on the gripper shaft without this having to be dismantled .
  • the body of the gripper finger opened in this way is closed by a spring, the spring force of which is adjustable.
  • this known gripper finger still has the ones explained above Disadvantages of wear and the game change, especially because the spring closing the opening does not provide sufficient resistance for this.
  • the invention avoids the disadvantages described. It is the object of the invention to propose a gripper finger with the features mentioned at the outset which, while maintaining the advantages thereby achieved, can be easily mounted on the gripper shaft without play changes in the various operating states, not even after a longer operating time. Rather, there should be automatic play compensation when the gripper bearing surface or the gripper shaft is worn.
  • the two-part design of the gripper finger makes it easy to assemble and disassemble the shaft, the second gripper finger part complementing the first gripper finger part to form a body which, when assembled, encloses the gripper shaft by an angle greater than 180 °, so that the gripper finger is captive overall the gripper shaft is held. While the first compression spring tries to spread the relevant ends of the two gripper finger parts from one another, the second compression spring presses the second gripper finger part with a greater force on the gripper shaft, as a result of which the arrangement remains stable.
  • the second compression spring must not, or at least not significantly, disrupt the course of the resulting force, which, as mentioned, connects the center of the gripper shaft with the transfer point of the gripper support, and for this reason the direction of force of the second compression spring runs in the direction of the line that forms the center connects the gripper shaft to the transfer point, or at least essentially in this connecting line.
  • the spring force of the second compression spring can be adjustable by suitable means. In other embodiments, which are structurally simpler, the spring force can also be predetermined.
  • the forces exerted on the second pressure piece are particularly compensated for when it is screwed to the gripper shaft at the end facing away from the first pressure spring. In any case, it is preferred if the second gripper finger part is screwed to the gripper shaft, and not the first gripper finger part.
  • the contact surfaces of the two parts of the gripper fingers on the gripper shaft can have a circular profile.
  • the arrangement made results in such good contact with the gripper shaft that it is preferred if the contact surfaces of at least one of the two gripper finger parts are rib-shaped for contact with the gripper shaft.
  • narrow contact surfaces are formed, which ensure a defined and reproducible contact of the gripper finger on the gripper shaft and which also contribute to achieving the object according to the invention.
  • FIG. 1 This sits on a gripper shaft 1.
  • the gripper support is indicated at item 2.
  • the finger part 3 of the gripper finger and the gripper support 2 this results in a transfer point 4 of the gripper finger on its gripper support.
  • the gripper finger holds the sheets - not shown in the drawing.
  • the gripper finger is basically constructed in two parts, a first gripper finger part 5 having an essentially U-shaped profile in such a way that an opening of somewhat less than 180 ° is formed so that the first gripper finger part can be pushed onto the gripper shaft.
  • the first gripper finger part 5 is supplemented by a second gripper finger part 6, which complements the opening of the first gripper finger part at an angle of noticeably over 180 °, so that in the assembled state of the gripper finger the opening is closed to such an extent that the completed gripper finger moves the gripper shaft around the corresponding one Angle of more than 180 ° and is therefore held captive.
  • the second gripper finger part 6 is fastened to the gripper shaft 1 by means of a screw 7.
  • the second gripper finger part 6 extends from a contact surface 8 to an extension 9, which receives a set screw 10.
  • the extension 9 merges at a point 11 into the main part of the second gripper finger part 6 and up to this point 11 the second gripper finger part 6 bears against the shaft 1 in the assembled state.
  • An inner edge 12 of the first gripper finger part 5 is shown in broken lines in FIG. 1, from which it is clear that the U-shaped first gripper finger part has an opening such that it can be pushed radially onto the gripper shaft.
  • the leg delimited by the edge 12 runs more or less parallel to the opposite leg 13 of the U-profile of the first gripper finger part.
  • a first compression spring 14 is arranged between the leg 13 of the first gripper finger part 5 and the extension 9 of the second gripper finger part 6, one end of which is supported in a corresponding recess 15 on the leg 13. The other end of the spring is held by a pin 16 of the set screw 10. With the help of the screw, the pressure force of the spring 14 can be adjusted. This pressure force tries to spread the legs 9, 13. Your force vector is indicated at item 17. It goes through transition point 4.
  • a set screw 19 is screwed into an extension 18 of this gripper finger part, the tip of which rests on the contact surface 8 of the second gripper finger part 6. This creates a force vector, which is indicated at item 20. 1 shows that the vector 20 also passes through the transfer point 4.
  • the two vectors 17, 20 add up so that a resulting vector 21 is created which connects the transfer point 4 to the center 22 of the gripper shaft 1, i.e. with the axis of the gripper shaft.
  • the second gripper finger part 6 is guided and received between lateral flanges 23 of the first gripper finger part 5. Flanges 24 of the first gripper finger part 5 stiffen this.
  • the upper side of this second compression spring 25 is supported on the upward-pointing extension of the first gripper finger part 5, which extension leads to the finger part 3. With its underside, the second compression spring 25 exerts pressure on the second gripper finger part 6 and thus presses it against the gripper shaft 1.
  • the force of the second compression spring 25 is greater than that of the first compression spring 14.
  • FIG. 1 also shows that the force of the second compression spring 25 is exerted on the gripper shaft via rib-shaped or wedge-shaped surfaces 11, 27, between which the material is drawn in a V-shape is.
  • Corresponding rib-shaped supports can also be provided on the first gripper finger part 5, preferably at the point opposite the ribs 11, 27, or also distributed over the support.
  • the force of the second compression spring 25 can be adjusted.
  • an adjusting screw 28 is provided which interacts with a wedge 29, the wedge surface of which rests on a counter-wedge surface of the second compression spring 25. If the screw 28 is screwed more or less into the finger 3, the wedge 29 moves and the force of the second compression spring 25 is increased or decreased accordingly.
  • FIG. 2 this is a leg spring 25a, the bent ends of which engage in corresponding receptacles on the finger 3 or on the gripper finger part 6, in FIG. 3 this is a leaf spring 25b, the tip of which likewise fits into a corresponding receptacle of the second gripper finger part 6 engages and which is fastened to the finger part 3 by means of a screw 30.
  • a V-shaped leaf spring 25c is provided, the legs of which are placed around the block-shaped contact piece 31 of the second gripper finger part 6 and the tip of which engages in a corresponding receptacle on the finger part 3.
  • Fig. 5 the arrangement is such that the second compression spring 25d is supported with its lower end directly on the gripper shaft 1, for which purpose it passes through a corresponding hole in the second gripper finger part 6. It is common to all embodiments that the other end of the second compression spring 25 is supported on the first gripper finger part 5 or on the finger part 3 thereof.
  • Fig. 5 also shows that it is not necessary for the second compression spring 25 to be supported on the second gripper finger part 6, because this is fastened to the gripper shaft 1 via the screw 7.
  • the embodiment according to FIGS. 1 to 4 is preferred in which the second gripper finger part is pressed against the gripper shaft via the second compression spring.
  • the second compression spring 25 is used to compensate for play and for this reason it is only essential for them to exert a force between the first gripper finger part and the gripper shaft in the direction of the vectors 21, 26 which coincide essentially in space.

Landscapes

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

Abstract

A gripper finger for a gripper spindle in a sheet-fed printing press includes first and second components. The first component has a gripper finger extension which contacts a gripper finger support at a transfer point. The first and second components cooperate to form an enclosure angle for enclosing the gripper spindle, with the first component contributing a maximum of 180 degrees to the enclosure angle and the second component supplementing the enclosure angle. The second component is fastened to the gripper spindle. A first compression spring is disposed between the ends of the first and second for exerting an adjustable, first spring force approximately in a direction of the transfer point. An adjustment screw is threadably engaged with one of the components and has a tip which lies against the supporting plane of the other component for exerting a screw force approximately in a direction of the transfer point. The first spring force and the screw force combine to form a resultant force in the direction of a line connecting the center point of the gripper spindle and the transfer point. A second compression spring clamped between the first component and the gripper spindle urges the first component against the gripper finger with a force greater than the first spring force and in a direction which essentially coincides with the direction of the resultant force.

Description

Die Erfindung betrifft einen Greiferfinger einer Greiferwelle einer Bogendruckmaschine mit einer ersten Druckfeder mit einstellbarer Federkraft, die eine Kraft etwa in Richtung des Übergabepunktes der Greiferauflage ausübt, ferner mit einer mit ihrer Spitze an einer Stützebene anliegenden Stellschraube, die ebenfalls eine Kraft etwa in Richtung des Übergabepunktes der Greiferauflage ausübt, wobei die Anordnung so getroffen ist, daß sie aus den beiden Kräften resultierende Kraft ein Vektor ist, der etwa den Mittelpunkt der Greiferwelle etwa mit dem Übergabepunkt verbindet.The invention relates to a gripper finger of a gripper shaft of a sheet-fed printing press with a first compression spring with adjustable spring force, which exerts a force approximately in the direction of the transfer point of the gripper pad, furthermore with an adjusting screw resting with its tip on a support plane, which likewise has a force approximately in the direction of the transfer point exerts the gripper pad, the arrangement being such that it is a vector resulting from the two forces, which connects approximately the center of the gripper shaft approximately to the transfer point.

Ein Greiferfinger mit diesen Merkmalen, der sich an und für sich bewährt hat, ist in der DE 36 32 768 C1 beschrieben. Besonderer Vorteil dieses bekannten Greiferfingers, von dem auch die vorliegende Erfindung Gebrauch macht, ist es, daß die im Betrieb auftretenden resultierenden Kräft durch die Greifermitte gehen, nämlich mehr oder weniger in einer Linie verlaufend, die die Mitte der Greiferwelle mit dem Übergabepunkt der Greiferauflage verbindet. Dadurch wird der ganz wesentliche Vorteil erreicht, daß in den verschiedenen Betriebszuständen praktisch kein Spielwechsel mehr auftritt, verglichen mit anderen bekannten Greiferfingern, die von diesem Prinzip keinen Gebrauch machen.A gripper finger with these features, which has proven itself in and of itself, is described in DE 36 32 768 C1. A particular advantage of this known gripper finger, of which the present invention also makes use, is that the resulting forces occurring during operation pass through the center of the gripper, namely more or less in a line that connects the center of the gripper shaft with the transfer point of the gripper support . This gives the very important advantage that there is practically no play change in the different operating states, compared to other known gripper fingers which do not make use of this principle.

Derartige Greiferfinger unterliegen jedoch einem verhältnismäßig hohen Verschleiß. Zum Auswechseln abgenutzter Greiferfinger muß die Greiferwelle komplett ausgebaut werden und erst dann können die Greiferfinger von der Greiferwelle abgezogen werden. Dies ist natürlich arbeitsaufwending und führt auch zu heute unzumutbaren hohen Stillstandszeiten der Maschine.However, such gripper fingers are subject to relatively high wear. To replace worn gripper fingers, the gripper shaft must be removed completely and only then can the gripper fingers be removed from the gripper shaft. Of course, this is labor intensive and leads to unacceptable long downtimes of the machine today.

Hier hat eine Anordnung schon Abhilfe geschaffen, die in der DE 36 23 405 C1 beschrieben ist. Der dort beschriebene Greiferfinger ist zweiteilig aufgebaut, wobei er aus einem unteren Greiferfingerteil und einem direkt darüber befindlichen oberen Greiferfingerteil besteht, deren dem Übergabepunkt benachbarte Enden über eine Druckfeder gespreizt werden. An den anderen Enden ist eine Stellschraube vorgesehen, die den Abstand der beiden Greiferfingerteile reguliert. Beide Greiferfingerteile werden durch eine Schraube an der Greiferwelle befestigt, die ein Loch im oberen Greiferfingerteil durchgreift und die in ein Gewinde in der Greiferwelle eingeschraubt ist. Das untere Greiferfingerteil hat eine Ausnehmung mit einem Zylinderteilprofil derart, daß es sich von derselben Seite (Oberseite) an die Greiferwelle anlegt, wo auch das obere Greiferfingerteil angeordnet ist.An arrangement has already remedied this, which is described in DE 36 23 405 C1. The gripper finger described there is constructed in two parts, it consisting of a lower gripper finger part and an upper gripper finger part located directly above it, the ends of which are adjacent to the transfer point and are spread by a compression spring. At the other ends there is a set screw that regulates the distance between the two parts of the gripper fingers. Both gripper finger parts are fastened to the gripper shaft by a screw which passes through a hole in the upper gripper finger part and which is screwed into a thread in the gripper shaft. The lower gripper finger part has a recess with a cylindrical part profile such that it bears against the gripper shaft from the same side (top side), where the upper gripper finger part is also arranged.

Dieser bekannte Greiferfinger hat zwar den Vorteil einer leichten Montage und Demontage, weil hierzu lediglich die Befestigungsschraube gelöst werden muß, jedoch ergibt sich beim Öffnen und Schließen des Greifers ein großer Spielwechsel und dadurch bedingt ein Verschieben der Greiferspitze, deren Ausmaß vom Verschleiß der Greiferlagerung abhängt. Dieser Verschleiß und der Spielwechsel haben zur Folge, daß die Bogen dublieren.This known gripper finger has the advantage of easy assembly and disassembly, because only the fastening screw has to be loosened for this, but there is a large play change when opening and closing the gripper and therefore a displacement of the gripper tip, the extent of which depends on the wear of the gripper bearing. This wear and the change of game have the consequence that the sheets duplicate.

Zum Stand der Technik wird auch noch verwiesen auf die DE-PS 11 74 804, die einen Greiferfinger zeigt, dessen Körper eine Öffnung von etwa 180° umspannt, so daß der Greiferfinger auf die Greiferwelle aufgesetzt werden kann, ohne daß diese dazu demontiert werden muß. Der derart geöffnete Körper des Greiferfingers wird durch eine Feder geschlossen, deren Federkraft einstellbar ist. Dieser bekannte Greiferfinger weist aber immer noch die vorstehend erläuterten Nachteile des Verschleisses und des Spielwechsels auf, insbesondere weil die die Öffnung schließende Feder hierfür keinen ausreichenden Widerstand leistet. Auch ist dort nicht dafür gesorgt, daß die von einer Druckfeder und einer Anlagefläche aufgebrachten Kräfte sich derart schneiden, daß die Resultierende dieser beiden Kräfte des Mittelpunkts der Greiferwelle mit dem Übergabepunkt verbindet, wie dies ebenfalls ein wesentliches Merkmal der Erfindung ist.The prior art is also referred to DE-PS 11 74 804, which shows a gripper finger, the body spans an opening of about 180 °, so that the gripper finger can be placed on the gripper shaft without this having to be dismantled . The body of the gripper finger opened in this way is closed by a spring, the spring force of which is adjustable. However, this known gripper finger still has the ones explained above Disadvantages of wear and the game change, especially because the spring closing the opening does not provide sufficient resistance for this. Nor is it ensured that the forces exerted by a compression spring and a contact surface intersect in such a way that the resultant of these two forces connects the center point of the gripper shaft to the transfer point, as is also an essential feature of the invention.

Die Erfindung vermeidet die geschilderten Nachteile. Ihr liegt die Aufgabe zugrunde, einen Greiferfinger mit den eingangs genannten Merkmalen vorzuschlagen, der bei Beibehaltung der dadurch erreichten Vorteile an der Greiferwelle leicht montierbar ist, ohne daß Spielwechsel in den verschiedenen Betriebszuständen auftreten können, auch nicht nach einer längeren Betriebsdauer. Vielmehr soll sich ein selbsttätiger Spielausgleich beim Verschleißen der Greiferlagerfläche bzw. der Greiferwelle ergeben.The invention avoids the disadvantages described. It is the object of the invention to propose a gripper finger with the features mentioned at the outset which, while maintaining the advantages thereby achieved, can be easily mounted on the gripper shaft without play changes in the various operating states, not even after a longer operating time. Rather, there should be automatic play compensation when the gripper bearing surface or the gripper shaft is worn.

Die gestellte Aufgabe wird durch die Vorrichtung gemäß den kennzeichnenden Merkmalen des Anspruchs 1 gelöst.The object is achieved by the device according to the characterizing features of claim 1.

Durch die zweiteilige Ausbildung des Greiferfingers wird dieser leicht an der Welle montierbar und demontierbar, wobei das zweite Greiferfingerteil das erste Greiferfingerteil zu einem Körper ergänzt, der die Greiferwelle in montiertem Zustand um einen Winkel größer als 180° umschließt, so daß der Greiferfinger insgesamt unverlierbar an der Greiferwelle gehalten ist. Während die erste Druckfeder die betreffenden Enden der beiden Greiferfingerteile voneinander zu spreizen sucht, drückt die zweite Druckfeder das zweite Greiferfingerteil mit einer größeren Kraft an die Greiferwelle, wodurch die Anordnung stabil bleibt. Die zweite Druckfeder darf den Verlauf der resultierenden Kraft, die, wie erwähnt, den Mittelpunkt der Greiferwelle mit dem Übergabepunkt der Greiferauflage verbindet, nicht oder zumindest nicht wesentlich stören und aus diesem Grunde verläuft die Kraftrichtung der zweiten Druckfeder in Richtung derjenigen Linie, die den Mittelpunkt der Greiferwelle mit dem Übergabepunkt verbindet, oder doch zumindest im wesentlichen in dieser Verbindungslinie.The two-part design of the gripper finger makes it easy to assemble and disassemble the shaft, the second gripper finger part complementing the first gripper finger part to form a body which, when assembled, encloses the gripper shaft by an angle greater than 180 °, so that the gripper finger is captive overall the gripper shaft is held. While the first compression spring tries to spread the relevant ends of the two gripper finger parts from one another, the second compression spring presses the second gripper finger part with a greater force on the gripper shaft, as a result of which the arrangement remains stable. The second compression spring must not, or at least not significantly, disrupt the course of the resulting force, which, as mentioned, connects the center of the gripper shaft with the transfer point of the gripper support, and for this reason the direction of force of the second compression spring runs in the direction of the line that forms the center connects the gripper shaft to the transfer point, or at least essentially in this connecting line.

Die Federkraft der zweiten Druckfeder kann durch geeignete Mittel einstellbar sein. Bei anderen Ausführungsformen, die konstruktiv einfacher sind, kann die Federkraft aber auch fest vorgegeben sein.The spring force of the second compression spring can be adjustable by suitable means. In other embodiments, which are structurally simpler, the spring force can also be predetermined.

Die auf das zweite Druckstück ausgeübten Kräfte werden besonders ausgeglichen, wenn es mit der Greiferwelle an dem der ersten Druckfeder abgewandten Ende verschraubt ist. In jedem Fall wird es bevorzugt, wenn das zweite Greiferfinger teil mit der Greiferwelle verschraubt ist, und nicht das erste Greiferfingerteil.The forces exerted on the second pressure piece are particularly compensated for when it is screwed to the gripper shaft at the end facing away from the first pressure spring. In any case, it is preferred if the second gripper finger part is screwed to the gripper shaft, and not the first gripper finger part.

Für die Halterung des zweiten Greiferfingerteils am ersten Greiferfingerteil ergibt sich eine konstruktiv besonders einfache und auch platzsparende Lösung, wenn das zweite Greiferfingerteil in einer Ausnehmung zwischen seitlichen Flanschen des ersten Greiferfingerteils aufgenommen ist.For the mounting of the second gripper finger part on the first gripper finger part there is a structurally particularly simple and space-saving solution if the second gripper finger part is received in a recess between lateral flanges of the first gripper finger part.

Die Anlageflächen der beiden Greiferfingerteile an der Greiferwelle können kreisrund profiliert sein. Die getroffene Anordnung ergibt aber einen so guten Kontakt mit der Greiferwelle, daß es bevorzugt wird, wenn die Anlageflächen wenigstens eines der beiden Greiferfingerteile zur Anlage an der Greiferwelle rippenförmig sind. Dadurch werden schmale Anlageflächen ausgebildet, die für eine definierte und reproduzierbare Anlage des Greiferfingers an der Greiferwelle sorgen und die ebenfalls zur Lösung der erfindungsgemäßen Aufgabe beitragen.The contact surfaces of the two parts of the gripper fingers on the gripper shaft can have a circular profile. However, the arrangement made results in such good contact with the gripper shaft that it is preferred if the contact surfaces of at least one of the two gripper finger parts are rib-shaped for contact with the gripper shaft. As a result, narrow contact surfaces are formed, which ensure a defined and reproducible contact of the gripper finger on the gripper shaft and which also contribute to achieving the object according to the invention.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen näher erläutert, aus denen sich weitere wichtige Merkmale ergeben. Es zeigt:

Fig. 1 -
eine teilweise geschnittene Seitenansicht eines auf einer Greiferwelle montierten Greiferfingers mitsamt seinem Übergabepunkt an einer angedeuteten Greiferauflage;
Fig. 2 - 5 -
Ansichten entsprechend Fig. 1, wobei abgeänderte Ausführungsformen der zweiten Druckfeder dargestellt sind.
The invention is explained in more detail below on the basis of exemplary embodiments, from which further important features result. It shows:
Fig. 1 -
a partially sectioned side view of a gripper finger mounted on a gripper shaft together with its transfer point on an indicated gripper support;
Fig. 2 - 5 -
Views corresponding to Fig. 1, showing modified embodiments of the second compression spring.

Zunächst sei anhand von Fig. 1 der grundsätzliche Aufbau des erfindungsgemäßen Greiferfingers näher erläutert. Dieser sitzt auf einer Greiferwelle 1. Die Greiferauflage ist bei Pos.2 angedeutet. Zwischen dem Fingerteil 3 des Greiferfingers und der Greiferauflage 2 ergibt sich dadurch eine Übergabepunkt 4 des Greiferfingers an seiner Greiferauflage. Hier hält der Greiferfinger die - zeichnerisch nicht dargestellten - Bogen.First, the basic structure of the gripper finger according to the invention will be explained in more detail with reference to FIG. 1. This sits on a gripper shaft 1. The gripper support is indicated at item 2. Between the finger part 3 of the gripper finger and the gripper support 2, this results in a transfer point 4 of the gripper finger on its gripper support. Here the gripper finger holds the sheets - not shown in the drawing.

Der Greiferfinger ist grundsätzlich zweiteilig aufgebaut, wobei ein erstes Greiferfingerteil 5 ein im wesentlichen U-förmiges Profil hat derart, daß sich eine Öffnung von etwas weniger als 180° bildet, so daß das erste Greiferfingerteil auf die Greiferwelle aufgeschoben werden kann.The gripper finger is basically constructed in two parts, a first gripper finger part 5 having an essentially U-shaped profile in such a way that an opening of somewhat less than 180 ° is formed so that the first gripper finger part can be pushed onto the gripper shaft.

Das erste Greiferfingerteil 5 wird durch ein zweites Greiferfingerteil 6 ergänzt, das die Öffnung des ersten Greiferfingerteils zu einem Winkel von fühlbar über 180° ergänzt, so daß in montiertem Zustand des Greiferfingers die Öffnung soweit geschlossen ist, daß der komplettierte Greiferfinger die Greiferwelle um den entsprechenden Winkel von mehr als 180° und daher an ihm unverlierbar gehalten ist. Das zweite Greiferfingerteil 6 ist mittels einer Schraube 7 an der Greiferwelle 1 befestigt. Das zweite Greiferfingerteil 6 erstreckt sich von einer Anlagefläche 8 bis zu einem Fortsatz 9, der eine Stellschraube 10 aufnimmt. Der Fortsatz 9 geht an einem Punkt 11 in das Hauptteil des zweiten Greiferfingerteils 6 über und bis zu diesem Punkt 11 liegt in montiertem Zustand das zweite Greiferfingerteil 6 an der Welle 1 an.The first gripper finger part 5 is supplemented by a second gripper finger part 6, which complements the opening of the first gripper finger part at an angle of noticeably over 180 °, so that in the assembled state of the gripper finger the opening is closed to such an extent that the completed gripper finger moves the gripper shaft around the corresponding one Angle of more than 180 ° and is therefore held captive. The second gripper finger part 6 is fastened to the gripper shaft 1 by means of a screw 7. The second gripper finger part 6 extends from a contact surface 8 to an extension 9, which receives a set screw 10. The extension 9 merges at a point 11 into the main part of the second gripper finger part 6 and up to this point 11 the second gripper finger part 6 bears against the shaft 1 in the assembled state.

Gestrichelt ist in Fig.1 eine innere Kante 12 des ersten Greiferfingerteils 5 gezeigt, woraus deutlich wird, daß das U-förmige erste Greiferfingerteil eine Öffnung hat derart, daß es auf die Greiferwelle radial aufgesteckt werden kann. Der von der Kante 12 begrenzte Schenkel verläuft mehr oder weniger parallel zu dem gegenüber liegenden Schenkel 13 des U-Profils des ersten Greiferfingerteils.An inner edge 12 of the first gripper finger part 5 is shown in broken lines in FIG. 1, from which it is clear that the U-shaped first gripper finger part has an opening such that it can be pushed radially onto the gripper shaft. The leg delimited by the edge 12 runs more or less parallel to the opposite leg 13 of the U-profile of the first gripper finger part.

Zwischen dem Schenkel 13 des ersten Greiferfingerteils 5 und dem Fortsatz 9 des zweiten Greiferfingerteils 6 ist eine erste Druckfeder 14 angeordnet, deren eines Ende sich in einer entsprechenden Ausnehmung 15 am Schenkel 13 abstützt. Das andere Ende der Feder wird durch einen Stift 16 der Stellschraube 10 gehalten. Mit Hilfe der Schraube kann die Druckkraft der Feder 14 eingestellt werden. Diese Druckkraft sucht die Schenkel 9, 13 zu spreizen. Ihr Kraftvektor ist bei Pos.17 angedeutet. Er geht durch den Übergangspunkt 4.A first compression spring 14 is arranged between the leg 13 of the first gripper finger part 5 and the extension 9 of the second gripper finger part 6, one end of which is supported in a corresponding recess 15 on the leg 13. The other end of the spring is held by a pin 16 of the set screw 10. With the help of the screw, the pressure force of the spring 14 can be adjusted. This pressure force tries to spread the legs 9, 13. Your force vector is indicated at item 17. It goes through transition point 4.

Etwa in der Mitte des U-Profils des ersten Greiferfingerteils 5 ist in einen Ansatz 18 dieses Greiferfingerteils eine Stellschraube 19 eingeschraubt, deren Spitze an der Anlagefläche 8 des zweiten Greiferfingerteils 6 anliegt. Dadurch wird ein Kraftvektor geschaffen, der bei Pos.20 angedeutet ist. Fig.1 zeigt, daß der Vektor 20 ebenfalls durch den Übergabepunkt 4 geht.Approximately in the middle of the U-profile of the first gripper finger part 5, a set screw 19 is screwed into an extension 18 of this gripper finger part, the tip of which rests on the contact surface 8 of the second gripper finger part 6. This creates a force vector, which is indicated at item 20. 1 shows that the vector 20 also passes through the transfer point 4.

Die beiden Vektoren 17,20 addieren sich so, daß ein resultierender Vektor 21 entsteht, der den Übergabepunkt 4 mit der Mitte 22 der Greiferwelle 1 verbindet, d.h. mit der Achse der Greiferwelle.The two vectors 17, 20 add up so that a resulting vector 21 is created which connects the transfer point 4 to the center 22 of the gripper shaft 1, i.e. with the axis of the gripper shaft.

Das zweite Greiferfingerteil 6 ist zwischen seitlichen Flanschen 23 des ersten Greiferfingerteils 5 geführt und aufgenommen. Flansche 24 des ersten Greiferfingerteils 5 versteifen dieses.The second gripper finger part 6 is guided and received between lateral flanges 23 of the first gripper finger part 5. Flanges 24 of the first gripper finger part 5 stiffen this.

Zwischen den Flanschen 23 ist auch eine Aufnahme für eine zweite Druckfeder 25 geschaffen, deren Kraftvektor 26 mit dem Vektor 21 zusammenfällt. Diese zweite Druckfeder 25 stützt sich mit ihrer Oberseite an der nach oben weisenden Verlängerung des ersten Greiferfingerteils 5 ab, welche Verlängerung zum Fingerteil 3 führt. Mit ihrer Unterseite übt die zweite Druckfeder 25 Druck auf das zweite Greiferfingerteil 6 aus und drückt dieses somit an die Greiferwelle 1 an. Die Kraft der zweiten Druckfeder 25 ist größer als diejenige der ersten Druckfeder 14. Fig. 1 zeigt auch, daß die Kraft der zweiten Druckfeder 25 über rippenförmige oder keilförmige Flächen 11,27 auf die Greiferwelle ausgeübt wird, zwischen denen das Material V-förmig eingezogen ist. Entsprechende rippenförmige Auflagen können auch am ersten Greiferfingerteil 5 vorgesehen sein, vorzugsweise an der den Rippen 11,27 gegenüber liegenden Stelle, oder auch über die Auflage verteilt.A receptacle for a second compression spring 25, the force vector 26 of which coincides with the vector 21, is also created between the flanges 23. The upper side of this second compression spring 25 is supported on the upward-pointing extension of the first gripper finger part 5, which extension leads to the finger part 3. With its underside, the second compression spring 25 exerts pressure on the second gripper finger part 6 and thus presses it against the gripper shaft 1. The force of the second compression spring 25 is greater than that of the first compression spring 14. FIG. 1 also shows that the force of the second compression spring 25 is exerted on the gripper shaft via rib-shaped or wedge-shaped surfaces 11, 27, between which the material is drawn in a V-shape is. Corresponding rib-shaped supports can also be provided on the first gripper finger part 5, preferably at the point opposite the ribs 11, 27, or also distributed over the support.

Bei dem in Fig.1 gezeigten Ausführungsbeispiel kann die Kraft der zweiten Druckfeder 25 eingestellt werden. Hierfür ist eine Stellschraube 28 vorgesehen, die miteinem Keil 29 zusammenwirkt, dessen Keilfläche an einer Gegenkeilfläche der zweiten Druckfeder 25 anliegt. Schraubt man die Schraube 28 mehr oder weniger in den Finger 3 ein, so verschiebt sich der Keil 29 und dadurchwird die Kraft der zweiten Druckfeder 25 entsprechend erhöht oder verringert.In the embodiment shown in Figure 1, the force of the second compression spring 25 can be adjusted. For this purpose, an adjusting screw 28 is provided which interacts with a wedge 29, the wedge surface of which rests on a counter-wedge surface of the second compression spring 25. If the screw 28 is screwed more or less into the finger 3, the wedge 29 moves and the force of the second compression spring 25 is increased or decreased accordingly.

Die Fig. 2 - 4 zeigen abgeänderten Ausführungsformen der zweiten Druckfeder 25, deren Druckkraft in diesen Figuren nicht einstellbar ist. In Fig.2 ist dies eine Schenkelfeder 25a, deren abgebogene Enden in entsprechenden Aufnahmen am Finger 3 bzw. am Greiferfingerteil 6 eingreifen, in Fig.3 ist dies eine Blattfeder 25b, deren Spitze ebenfalls in eine entsprechende Aufnahme des zweiten Greiferfingerteils 6 eingreift und die über eine Schraube 30 am Fingerteil 3 befestigt ist. In Fig. 4 ist eine V-förmige Blattfeder 25c vorgesehen, deren Schenkel um das klotzförmige Anlagestück 31 des zweiten Greiferfingerteils 6 gelegt sind und deren Spitze in eine entsprechende Aufnahme am Fingerteil 3 eingreift.2-4 show modified embodiments of the second compression spring 25, the compression force of which cannot be adjusted in these figures. In FIG. 2 this is a leg spring 25a, the bent ends of which engage in corresponding receptacles on the finger 3 or on the gripper finger part 6, in FIG. 3 this is a leaf spring 25b, the tip of which likewise fits into a corresponding receptacle of the second gripper finger part 6 engages and which is fastened to the finger part 3 by means of a screw 30. 4, a V-shaped leaf spring 25c is provided, the legs of which are placed around the block-shaped contact piece 31 of the second gripper finger part 6 and the tip of which engages in a corresponding receptacle on the finger part 3.

In Fig. 5 ist die Anordnung derart getroffen, daß die zweite Druckfeder 25d sich mit ihrem unteren Ende direkt auf der Greiferwelle 1 abstützt, wozu sie ein entsprechendes Loch des zweiten Greiferfingerteils 6 durchgreift. Allen Ausführungsformen ist es gemeinsam, daß sich das andere Ende der zweiten Druckfeder 25 am ersten Greiferfingerteil 5 bzw. an dessen Fingerteil 3 abstützt.In Fig. 5 the arrangement is such that the second compression spring 25d is supported with its lower end directly on the gripper shaft 1, for which purpose it passes through a corresponding hole in the second gripper finger part 6. It is common to all embodiments that the other end of the second compression spring 25 is supported on the first gripper finger part 5 or on the finger part 3 thereof.

Fig. 5 zeigt auch, daß es nicht notwendig ist, daß sich die zweite Druckfeder 25 am zweiten Greiferfingerteil 6 abstützt, weil dieses ja über die Schraube 7 an der Greiferwelle 1 befestigt ist. Allerdings wird die Ausführungsform nach Fig. 1 bis 4 bevorzugt, bei der das zweite Greiferfingerteil über die zweite Druckfeder an die Greiferwelle angepreßt wird. Die zweite Druckfeder 25 dient zum Spielausgleich und aus diesem Grunde ist es für sie nur wesentlich, eine Kraft zwischen dem ersten Greiferfingerteil und der Greiferwelle in Richtung der im wesentlichen räumlich zusammenfallenden Vektoren 21, 26 auszuüben.Fig. 5 also shows that it is not necessary for the second compression spring 25 to be supported on the second gripper finger part 6, because this is fastened to the gripper shaft 1 via the screw 7. However, the embodiment according to FIGS. 1 to 4 is preferred in which the second gripper finger part is pressed against the gripper shaft via the second compression spring. The second compression spring 25 is used to compensate for play and for this reason it is only essential for them to exert a force between the first gripper finger part and the gripper shaft in the direction of the vectors 21, 26 which coincide essentially in space.

Claims (3)

  1. Gripper finger of a gripper shaft of a sheet printing press, with a first compression spring (14) with adjustable spring force, which seen in the position in which a sheet is grasped exerts a force (17) substantially in the direction of the transfer point (4) of the gripper support (2), further with an adjusting screw (19) with its point lying against a support plane (8), which likewise, seen in the position in which a sheet is grasped directly exerts a force (20) substantially in the direction of the transfer point (4) of the gripper support (2), wherein the arrangement is so put together that the force (21) resulting from both of the forces (17, 20) is a vector which connects substantially the centre point (22) of the gripper shaft (1) with substantially the transfer point (4), characterised in that the gripper finger is constructed in two portions in such a fashion that a first gripper finger portion (5), which carries the gripper finger (3), surrounds the gripper shaft (1) by an angle of at most 180° and is enlarged by a second gripper finger portion (6) to a surrounding angle of greater than 180°, wherein the second gripper finger portion (6) is directly fixed on to the gripper shaft (1) by means of a screw (7) and wherein the first compression spring (14) is arranged between ends (9, 13) of both gripper finger portions (5, 6) and a second compression spring (25) is provided which is set between the first gripper finger portion (9) and the shaft (1) and which presses the first gripper finger portion (5) against the gripper shaft, the spring force of which is greater than the spring force of the first spring (14) and the direction of the force (26) of which substantially coincides with the vector (21) of the resultant forces.
  2. Gripper finger according to Claim 1, characterised in that the spring force of the second compression spring (25) is adjustable via wedge surfaces (29).
  3. Gripper finger according to Claim 1 or 2, characterised in that the second gripper finger portion (6) is received in a recess between lateral flanges (23) of the first gripper finger portion (5).
EP91110641A 1990-08-18 1991-06-27 Gripper finger of a sheet-fed printing machine gripper shaft Expired - Lifetime EP0476244B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4026237A DE4026237C1 (en) 1990-08-18 1990-08-18
DE4026237 1990-08-18

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EP0476244A1 EP0476244A1 (en) 1992-03-25
EP0476244B1 true EP0476244B1 (en) 1994-05-18

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EP91110641A Expired - Lifetime EP0476244B1 (en) 1990-08-18 1991-06-27 Gripper finger of a sheet-fed printing machine gripper shaft

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US (1) US5199757A (en)
EP (1) EP0476244B1 (en)
JP (1) JPH0751351B2 (en)
AT (1) ATE105778T1 (en)
DE (2) DE4026237C1 (en)

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DE4214191A1 (en) * 1992-04-30 1993-11-04 Roland Man Druckmasch Gripper for sheet printing press - has rollers at end of gripper fingers in contact with branched curved segment of shaft which compensates for excess pressure on gripper
DE4233421C1 (en) * 1992-04-30 1994-02-17 Roland Man Druckmasch Gripper for sheet printing machine - has congruent guide tracks on side wall surfaces of gripper finger in region of screw, each track having roller body locating in gripper retainer
GB2268928B (en) * 1992-07-22 1995-10-18 Heidelberger Druckmasch Ag Sheet gripper for a paper-carrying cylinder of a sheet-fed printing press
DE4321850A1 (en) * 1993-07-01 1995-01-12 Roland Man Druckmasch Grippers for sheet-fed printing machines
US5396842A (en) * 1993-09-03 1995-03-14 Halm Industries Co., Inc. Printing press including improved gripper assembly
CH689976A5 (en) * 1994-05-24 2000-02-29 Bobst Sa Device for controlling the taking of a plate element by clips in a such material processing machine.
DE4434151C2 (en) * 1994-09-24 2000-05-25 Heidelberger Druckmasch Ag Grippers for sheet-fed printing machines
DE19816512B4 (en) * 1997-08-18 2008-08-28 Heidelberger Druckmaschinen Ag Sheet gripper in a sheet-fed rotary printing machine
FR2775472B1 (en) * 1998-02-27 2000-05-19 Dubuit Mach LOADING AND / OR UNLOADING DEVICE WITH A MOVING JAW TRANSFER, IN PARTICULAR FOR A PRINTING MACHINE
EP0970808B1 (en) * 1998-07-06 2003-09-10 Heidelberger Druckmaschinen Aktiengesellschaft Gripper for a sheet transfer cylinder or drum of a rotary printing machine
US6227589B1 (en) * 1999-12-01 2001-05-08 Philadelphia Newspapers, Inc. Gripper assembly for a conveying device for conveying single-sheet or multi-sheet printed products and a method for modifying the same
DE10152592A1 (en) 2001-10-24 2003-05-08 Koenig & Bauer Ag Rapier / gripper shaft system

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DE66634C (en) * A. ALBISSER in Obersulz, Elsafs Machine for grinding card cover fittings
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US3536321A (en) * 1968-06-13 1970-10-27 Planeta Veb Druckmasch Werke Device for clamping sheet material
DE1908181A1 (en) * 1969-02-19 1970-11-05 Roland Offsetmaschf Clamp gripper for sheet-fed rotary printing machines
DE2822043C3 (en) * 1978-05-20 1981-02-12 Koenig & Bauer Ag, 8700 Wuerzburg One-piece gripper of a cylinder of a rotary printing press
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US4647031A (en) * 1985-07-22 1987-03-03 The Dow Chemical Company Gripper finger device
DE3529639A1 (en) * 1985-08-19 1987-02-26 Roland Man Druckmasch SPRING GRIPPER FOR ARC ROTATION PRINTING MACHINES
DE3623405A1 (en) * 1986-07-11 1988-02-04 Miller Johannisberg Druckmasch BOW GRIPPER FOR BOW-PROCESSING MACHINES
DE3632768C1 (en) * 1986-09-26 1988-01-14 Roland Man Druckmasch Clamping gripper for sheet-fed rotary printing machines
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US4968081A (en) * 1989-03-13 1990-11-06 Hall Processing Systems Non-contact actuator

Also Published As

Publication number Publication date
US5199757A (en) 1993-04-06
JPH0751351B2 (en) 1995-06-05
DE4026237C1 (en) 1992-02-06
DE59101660D1 (en) 1994-06-23
ATE105778T1 (en) 1994-06-15
JPH04234653A (en) 1992-08-24
EP0476244A1 (en) 1992-03-25

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