EP0476244B1 - Doigt de pince d'un arbre à pinces d'une machine d'impression alimentée en feuilles - Google Patents

Doigt de pince d'un arbre à pinces d'une machine d'impression alimentée en feuilles 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
Authority
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
Application number
EP91110641A
Other languages
German (de)
English (en)
Other versions
EP0476244A1 (fr
Inventor
Claus D. Simeth
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0476244A1 publication Critical patent/EP0476244A1/fr
Application granted granted Critical
Publication of EP0476244B1 publication Critical patent/EP0476244B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers
    • 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)
  • Discharge By Other Means (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Manipulator (AREA)

Claims (3)

  1. Doigt de pince d'un arbre pour pinces d'une machine d'impression à feuilles, comportant un premier ressort de pression (14) ayant une force réglable, qui, dans la position dans laquelle une feuille est détectée, exerce une force (17) sensiblement en direction du point de transfert (4) de l'appui de pince (2), comportant de plus une vis de réglage (19) s'appuyant, par sa pointe, contre un plan d'appui (8), vis qui, de même, dans la position dans laquelle une feuille est détectée, excerce une force (20) sensiblement en direction du point de transfert (4) de l'appui de pince (2), l'agencement étant tel que la force (21) résultant des deux forces (17,20) est un vecteur qui relie sensiblement le centre (22) de l'arbre pour pinces (1) sensiblement avec le point de transfert (4),
    caractérisé en ce que le doigt de pince est réalisé en deux parties, de sorte qu'une première partie (5) du doigt de pince, qui porte le doigt de pince (3), entoure l'arbre pour pinces (1) sous un angle d'au maximum 180°, et est complétée par une seconde partie (6) du doigt de pince en un angle d'enveloppement supérieur à 180°, la seconde partie du doigt de pince (6) étant fixée directement sur l'arbre pour pinces (1) au moyen d'une vis (7), et le premier ressort de pression (14) étant agencé entre des extrémités (9,13) des deux parties (5,6) du doigt de pince, et un second ressort de pression (25) étant prévu, qui est serré entre la première partie (5) du doigt de pince et l'arbre (1) et qui presse la première partie (5) du doigt de pince contre l'arbre pour pinces (1), dont la force est plus grande que la force du premier ressort (14) et dont la direction d'action (26) coïncide généralement avec le vecteur (21) des forces résultantes.
  2. Doigt de pince selon la revendication 1,
    caractérisé en ce que la force du second ressort de pression (25) peut être réglée par des surfaces en forme de coin (29).
  3. Doigt de pince selon la revendication 1 ou 2,
    caractérisé en ce que la seconde partie du doigt de pince (6) est reçue dans un évidement entre des brides latérales (23) de la première partie du doigt de pince (5).
EP91110641A 1990-08-18 1991-06-27 Doigt de pince d'un arbre à pinces d'une machine d'impression alimentée en feuilles Expired - Lifetime EP0476244B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
EP0476244A1 EP0476244A1 (fr) 1992-03-25
EP0476244B1 true EP0476244B1 (fr) 1994-05-18

Family

ID=6412522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110641A Expired - Lifetime EP0476244B1 (fr) 1990-08-18 1991-06-27 Doigt de pince d'un arbre à pinces d'une machine d'impression alimentée en feuilles

Country Status (5)

Country Link
US (1) US5199757A (fr)
EP (1) EP0476244B1 (fr)
JP (1) JPH0751351B2 (fr)
AT (1) ATE105778T1 (fr)
DE (2) DE4026237C1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4214191A1 (de) * 1992-04-30 1993-11-04 Roland Man Druckmasch Greifer fuer bogendruckmaschinen
DE4233421C1 (de) * 1992-04-30 1994-02-17 Roland Man Druckmasch Greifer für Bogendruckmaschinen
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 (de) * 1993-07-01 1995-01-12 Roland Man Druckmasch Greifer für Bogendruckmaschinen
US5396842A (en) * 1993-09-03 1995-03-14 Halm Industries Co., Inc. Printing press including improved gripper assembly
CH689976A5 (fr) * 1994-05-24 2000-02-29 Bobst Sa Dispositif de commande de la prise d'un élément en plaque par des pinces au sein d'une machine de traitement de tels éléments.
DE4434151C2 (de) * 1994-09-24 2000-05-25 Heidelberger Druckmasch Ag Greifer für Bogendruckmaschinen
DE19816512B4 (de) * 1997-08-18 2008-08-28 Heidelberger Druckmaschinen Ag Bogengreifer in einer Bogenrotationsdruckmaschine
FR2775472B1 (fr) * 1998-02-27 2000-05-19 Dubuit Mach Dispositif de chargement et/ou de dechargement a organe de transfert a machoire mobile, en particulier pour machine a imprimer
DE19927695A1 (de) * 1998-07-06 2000-01-13 Heidelberger Druckmasch Ag Greifer für einen bogentransportierenden Zylinder oder Trommel einer Rotationsdruckmaschine
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 (de) * 2001-10-24 2003-05-08 Koenig & Bauer Ag Greifer-/Greiferwellesystem

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE66634C (de) * A. ALBISSER in Obersulz, Elsafs Maschine zum Schleifen von Krempeldeckelbeschlägen
US2882049A (en) * 1955-03-12 1959-04-14 Roland Offsetmaschf Gripper for use in printing machines
FR1235353A (fr) * 1958-05-10 1960-07-08 Olivetti & Co Spa Perforateur de bande pour machines à écrire, comptables et similaires
DE1174804B (de) * 1962-06-26 1964-07-30 Planeta Veb Druckmasch Werke Bogengreifer an bogenverarbeitenden Maschinen
US3536321A (en) * 1968-06-13 1970-10-27 Planeta Veb Druckmasch Werke Device for clamping sheet material
DE1908181A1 (de) * 1969-02-19 1970-11-05 Roland Offsetmaschf Klemmgreifer fuer Bogenrotationsdruckmaschinen
DE2822043C3 (de) * 1978-05-20 1981-02-12 Koenig & Bauer Ag, 8700 Wuerzburg Einteiliger Greifer eines Zylinders einer Rotationsdruckmaschine
DD154083A1 (de) * 1980-11-17 1982-02-24 Arndt Jentzsch Bogengreifereinrichtung
DD226519B1 (de) * 1984-09-05 1990-10-10 Polygraph Leipzig Bogengreifer fuer bogenver- und -bearbeitende maschinen
US4647031A (en) * 1985-07-22 1987-03-03 The Dow Chemical Company Gripper finger device
DE3529639A1 (de) * 1985-08-19 1987-02-26 Roland Man Druckmasch Federnder greifer fuer bogenrotationsdruckmaschinen
DE3623405A1 (de) * 1986-07-11 1988-02-04 Miller Johannisberg Druckmasch Bogengreifer fuer bogenverarbeitende maschinen
DE3632768C1 (de) * 1986-09-26 1988-01-14 Roland Man Druckmasch Klemmgreifer fuer Bogenrotationsdruckmaschinen
DE3632769A1 (de) * 1986-09-26 1988-04-07 Roland Man Druckmasch Klemmgreifer fuer bogenrotationsdruckmaschinen
US4968081A (en) * 1989-03-13 1990-11-06 Hall Processing Systems Non-contact actuator

Also Published As

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

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