US20080290594A1 - Transfer Drum for Conveying a Sheet in a Machine of the Graphic Arts Industry - Google Patents

Transfer Drum for Conveying a Sheet in a Machine of the Graphic Arts Industry Download PDF

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Publication number
US20080290594A1
US20080290594A1 US12/127,032 US12703208A US2008290594A1 US 20080290594 A1 US20080290594 A1 US 20080290594A1 US 12703208 A US12703208 A US 12703208A US 2008290594 A1 US2008290594 A1 US 2008290594A1
Authority
US
United States
Prior art keywords
cam
transfer drum
gripper shaft
gripper
levers
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.)
Abandoned
Application number
US12/127,032
Other languages
English (en)
Inventor
Gerd Merkel
Stefan Mutschall
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
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Assigned to HEIDELBERGER DRUCKMASCHINEN AG reassignment HEIDELBERGER DRUCKMASCHINEN AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MUTSCHALL, STEFAN, MERKEL, GERD
Publication of US20080290594A1 publication Critical patent/US20080290594A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
    • B65H5/12—Revolving grippers, e.g. mounted on arms, frames or cylinders
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
    • B65H5/14—Details of grippers; Actuating-mechanisms therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2220/00—Function indicators
    • B65H2220/09—Function indicators indicating that several of an entity are present
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/20—Force systems, e.g. composition of forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/50—Driving mechanisms
    • B65H2403/51—Cam mechanisms
    • B65H2403/512—Cam mechanisms involving radial plate cam

Definitions

  • the invention relates to a transfer drum for conveying a sheet in a machine of the graphic arts industry.
  • the drum has a drum body supported in a frame rotatably about an axis.
  • a gripper shaft extends parallel to the axis of the drum body.
  • Grippers are mounted on the gripper shaft for holding an edge of the sheet.
  • Levers are fixed to the ends of the gripper shaft, and a cam mechanism is disposed for opening and closing the grippers.
  • the cam mechanism includes control cams that are connected to the frame and have contact surfaces, and cam followers that are fixed to the levers and are in contact with the contact surfaces.
  • a gripper system includes a plurality of gripper fingers, which are supported on a gripper shaft and cooperate with other gripper fingers or gripper pads.
  • the gripper shaft is supported on the drum body so as to pivot about an axis that is parallel to the axis of rotation of the transfer drum.
  • the pivoting movement is controlled by a gearing mechanism, in particular a cam mechanism.
  • a cam mechanism When a cam mechanism is used, the gripper shaft is connected to a roller lever.
  • a cam roller supported on the roller lever interacts with a cam that is fixed to the frame of the machine.
  • German published patent application DE 102 48 974 A1 describes a gripper arrangement with a cam roller that is held in friction-locked engagement with a control cam by means of a torsion bar spring.
  • the torsion bar spring is arranged inside a gripper shaft.
  • the ends of the torsion bar spring are fixed against rotation on a roller lever of the cam follower and on a tensioning lever.
  • the tensioning lever is used for the dynamic adjustment of the engaging force between the cam follower and the control cam.
  • U.S. Pat. No. 5,813,338 and its corresponding German published patent document DE 697 08 026 T2 disclose a mechanism for opening and closing grippers of a sheet transport cylinder.
  • the mechanism includes cam followers that are held in form-fitting engagement with contact surfaces of control cams.
  • Double levers with cam followers that cooperate with double cams are arranged on the ends of a gripper shaft.
  • the cams of a double cam are twisted with respect to each other in such a way that the cam rollers rest on the contact surfaces without play.
  • a transfer drum for conveying a sheet in a machine of the graphic arts industry comprising:
  • a drum body rotatably mounted in a frame for rotation about a drum axis
  • a gripper shaft disposed parallel to said drum axis, said gripper shaft having ends;
  • grippers mounted on said gripper shaft and configured for holding an edge of the sheet
  • cam mechanism for opening and closing said grippers, said cam mechanism including control cams connected to the frame and having contact surfaces, and cam followers affixed to said levers and in contact with said contact surfaces;
  • cam mechanisms with stationary cams whose follower elements are fixed to the ends of a gripper shaft are used to open and close grippers on a transfer drum.
  • the follower elements in particular engagement elements consisting of a lever and a cam roller, are fixed to the gripper shaft in such a way that torques of opposing directions are applied.
  • the cams are preferably formed identically, i.e., they follow the same cam race design.
  • a gripper system may be provided on precisely one gripper shaft on a transfer drum. Furthermore, it is possible to provide multiple gripper systems and gripper shafts on a transfer drum. For example, a transfer drum may be driven at half the angular speed of a plate cylinder and may have two gripper shafts that are arranged diametrically opposite each other. At the ends of each gripper shaft, a lever and a cam roller are provided, and the cam rollers rest on common shaft in a force-fitting engagement.
  • Transfer drums include all cylinders and drums that convey sheets such as impression cylinders, transfer drums, storage drums, reversing drums.
  • each gripper system is actuated on both sides with opposing torques so that the occurring torsion is reduced compared to the solutions of the prior art.
  • the engagement elements, in particular the cam rollers are guided in a force-fitting way on the contact surfaces, such that positive contact is ensured and the system is not sensitive to manufacturing and assembly tolerances. Due to this positive contact, no undesirable spring action is required.
  • the load applied to the cam mechanisms is reduced and thus there is less wear to the cam mechanisms because of the distribution of the static and dynamic loads.
  • the gripper shaft acts as a torsion spring element in that the shaft is twisted to generate the torques of opposite directions.
  • a torsion bar spring connecting the shaft ends and twisted to ensure positive contact can be provided inside a divided gripper shaft.
  • the torques of opposing direction that act on the gripper shaft may furthermore be created by roller levers to which bending forces are applied.
  • FIG. 1 is an elevational illustration of a transfer drum in a view perpendicular to the axial direction;
  • FIG. 2 is an axial view of a transfer drum
  • FIG. 3 is a view of a detail of the gripper system of the transfer drum of FIG. 2 ;
  • FIG. 4 is a diagram of the gripper control
  • FIG. 5 is a diagram of the gear mechanism assembly
  • FIG. 6 is a graph plotting the loads acting on cam rollers
  • FIG. 7 is a variant with an inner cam and an outer cam
  • FIG. 8 is a view of a variant with a divided gripper shaft and a torsion bar spring.
  • a drum body 1 includes journals 2 , 3 for supporting the drum body 1 in side walls of the printing press.
  • the transfer drum is supported in the side walls so as to rotate about an axis 4 .
  • a cylindrical jacket surface 5 and a gap 6 are formed on the drum body 1 .
  • a gripper shaft 7 is held in bearing blocks 8 so as to pivot about an axis 9 .
  • the axes 4 , 9 of the drum body 1 and of the gripper shaft 7 are parallel.
  • Roller levers 10 , 11 including cam rollers 12 , 13 are fixed to the ends of the gripper shaft 7 .
  • the cam rollers 12 , 13 roll on contact surfaces of cams 14 , 15 , which are connected to the side walls and have identical cam laws.
  • the roller levers 10 , 11 are arranged on the cams in such a way that opposing torques act on the gripper shaft 7 .
  • the cam mechanisms including the cams 14 , 15 , rollers 12 , 13 , and levers 10 , 11 cause an identical movement of the gripper shaft 7 to open and close the grippers 16 arranged on the gripper shaft 7 .
  • the twisting of the gripper shaft 7 remains constant.
  • roller levers 10 , 11 are arranged on the gripper shaft 7 at an angle a relative to each other to ensure constant twisting and to cause the rollers 12 , 13 to be pressed against the contact surfaces of the cams 14 , 15 by a force. Thus neither static nor dynamic forces may cause the rollers 12 , 13 to be disengaged from the contact surfaces.
  • FIG. 3 illustrates a detail of the gripper system.
  • Each gripper 16 consists of a gripper finger 17 and a gripper pad 18 .
  • a sheet 19 is held between the gripper fingers 17 and the gripper pads 18 due to the force of a spring 20 .
  • the sheet 19 rests on the jacket surface 5 .
  • FIGS. 4 and 5 illustrate diagrams of the generation of the opposing torques M 1 , M 2 on the gripper shaft 7 .
  • the levers 10 , 11 are fixed to the gripper shaft 7 at an angle ⁇ relative to the gripper shaft 7 .
  • This angle ⁇ is smaller than the angle a that both levers 10 , 11 form when they are in the functional position.
  • lever 10 is pushed from the position illustrated in dashes into the position indicated in full lines, thus causing the gripper shaft 7 to be twisted.
  • the torques M 1 , M 2 of opposing direction are generated at the ends of the gripper shaft 7 .
  • the lengths I of the levers 10 , 11 result in a contacting pressure F between the rollers 12 , 13 and the cams 14 , 15 .
  • FIG. 6 is a diagram of a progress of the contact pressures F 1 , F 2 of the rollers 12 , 13 during one rotation of the drum body 1 .
  • the forces F 1 and F 2 are substantially the same due to a pre-load.
  • the force F 1 of roller 12 increases whereas the load F 2 of roller 13 decreases.
  • the effect of the gripper forces is evenly distributed among the rollers 12 , 13 , so that the absolute change in the roller forces on both sides has the same amount.
  • FIG. 7 illustrates a variant in which the roller levers 10 , 11 are located radially on the same side of a gripper shaft 7 as viewed in the direction of movement 21 .
  • the roller 12 interacts with an inner cam 22 and the roller 13 interacts with an outer cam 23 .
  • the opposing torques M 1 , M 2 were created by twisting the gripper shaft 7 .
  • a gripper shaft 7 is divided at the center.
  • the torsion-proof and bend-proof sections 7 . 1 , 7 . 2 are hollow, coaxial with respect to each other, and are freely rotatable with respect to each other about the axis 9 of the gripper shaft 7 .
  • the pretensioning of the cam mechanisms acting on the ends of the gripper shaft 7 is created by twisting a torsion bar spring 24 provided inside the sections 7 . 1 ., 7 . 2 .
  • the torsion bar spring 24 connects the outer ends of the sections 7 . 1 , 7 . 2 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
US12/127,032 2007-05-24 2008-05-27 Transfer Drum for Conveying a Sheet in a Machine of the Graphic Arts Industry Abandoned US20080290594A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007024646.5 2007-05-24
DE102007024646 2007-05-24

Publications (1)

Publication Number Publication Date
US20080290594A1 true US20080290594A1 (en) 2008-11-27

Family

ID=39877394

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/127,032 Abandoned US20080290594A1 (en) 2007-05-24 2008-05-27 Transfer Drum for Conveying a Sheet in a Machine of the Graphic Arts Industry

Country Status (4)

Country Link
US (1) US20080290594A1 (ja)
JP (1) JP2008290459A (ja)
CN (1) CN101310979A (ja)
DE (1) DE102008023333A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100236354A1 (en) * 2009-03-20 2010-09-23 Heidelberger Druckmaschinen Ag Cam mechanism having a control cam and a control roller, alignment cylinder and sheet processing machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013217096B4 (de) * 2012-08-28 2021-07-01 Koenig & Bauer Ag Vorrichtung zum Öffnen und Schließen der Greifer eines bogenführenden Zylinders in Druckmaschinen
CN103342047B (zh) * 2013-07-16 2015-12-02 成都印钞有限公司 一种轮辐式防蹭脏滚筒
TWI803951B (zh) * 2021-08-26 2023-06-01 崑山科技大學 夾持輸送設備

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926909A (en) * 1959-03-17 1960-03-01 Miehle Goss Dexter Inc Sheet transfer mechanism
US3151552A (en) * 1963-04-17 1964-10-06 Miehle Goss Dexter Inc Spring gripper assembly
US3929069A (en) * 1972-05-23 1975-12-30 Heidelberger Druckmasch Ag Gripper control for sheet-fed rotary printing presses
US4133263A (en) * 1975-10-22 1979-01-09 Heidelberger Druckmaschinen Ag Sheet-turning drum for printing machines convertible from printing on one side of a sheet to printing on both sides of a sheet and vice versa
US4647031A (en) * 1985-07-22 1987-03-03 The Dow Chemical Company Gripper finger device
US4759290A (en) * 1985-03-12 1988-07-26 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Device for controlling grippers in sheet-fed rotary presses
US5813338A (en) * 1996-10-31 1998-09-29 Akiyama Printer Manufacturing Co., Ltd. Gripper opening/closing mechanism of sheet transfer cylinder in sheet-fed printing machine
US5906368A (en) * 1994-11-25 1999-05-25 Buhrs-Zaandam B.V. Drive mechanism for a gripper mechanism arranged in a drivable drum for feeding separate products

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10248974B4 (de) 2001-11-16 2019-01-24 Heidelberger Druckmaschinen Ag Greiferanordnung in einer Rotationsdruckmaschine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926909A (en) * 1959-03-17 1960-03-01 Miehle Goss Dexter Inc Sheet transfer mechanism
US3151552A (en) * 1963-04-17 1964-10-06 Miehle Goss Dexter Inc Spring gripper assembly
US3929069A (en) * 1972-05-23 1975-12-30 Heidelberger Druckmasch Ag Gripper control for sheet-fed rotary printing presses
US4133263A (en) * 1975-10-22 1979-01-09 Heidelberger Druckmaschinen Ag Sheet-turning drum for printing machines convertible from printing on one side of a sheet to printing on both sides of a sheet and vice versa
US4759290A (en) * 1985-03-12 1988-07-26 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Device for controlling grippers in sheet-fed rotary presses
US4647031A (en) * 1985-07-22 1987-03-03 The Dow Chemical Company Gripper finger device
US5906368A (en) * 1994-11-25 1999-05-25 Buhrs-Zaandam B.V. Drive mechanism for a gripper mechanism arranged in a drivable drum for feeding separate products
US5813338A (en) * 1996-10-31 1998-09-29 Akiyama Printer Manufacturing Co., Ltd. Gripper opening/closing mechanism of sheet transfer cylinder in sheet-fed printing machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100236354A1 (en) * 2009-03-20 2010-09-23 Heidelberger Druckmaschinen Ag Cam mechanism having a control cam and a control roller, alignment cylinder and sheet processing machine

Also Published As

Publication number Publication date
JP2008290459A (ja) 2008-12-04
CN101310979A (zh) 2008-11-26
DE102008023333A1 (de) 2008-11-27

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HEIDELBERGER DRUCKMASCHINEN AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MERKEL, GERD;MUTSCHALL, STEFAN;REEL/FRAME:021236/0620;SIGNING DATES FROM 20080515 TO 20080520

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION