US3276365A - Printing plate clamping device for a printing press - Google Patents

Printing plate clamping device for a printing press Download PDF

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Publication number
US3276365A
US3276365A US407506A US40750664A US3276365A US 3276365 A US3276365 A US 3276365A US 407506 A US407506 A US 407506A US 40750664 A US40750664 A US 40750664A US 3276365 A US3276365 A US 3276365A
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US
United States
Prior art keywords
shaft
bar
plate
slot
teeth
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
US407506A
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English (en)
Inventor
Langer Karl
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.)
Roland Offsetmaschinenfabrik Faber and Schleicher AG
Original Assignee
Roland Offsetmaschinenfabrik Faber and Schleicher 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 Roland Offsetmaschinenfabrik Faber and Schleicher AG filed Critical Roland Offsetmaschinenfabrik Faber and Schleicher AG
Application granted granted Critical
Publication of US3276365A publication Critical patent/US3276365A/en
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
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1237—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by translatory motion substantially perpendicular to support surface

Definitions

  • the present invention relates to a device for tautly clamping a bendable plate upon the cylinder of a printing press and, more particularly, upon a plate cylinder having a lengthwise slot for clamping therein the respective ends of the plate.
  • a more specific object of the invention is to provide a novel and improved clamping device of the general kind above referred to which holds both plate ends tightly against wall portions of the cylinder defining the slot therein, thereby strongly securing the plate to the cylinder.
  • a rotatable shaft or spindle having in its peripheral wall a plurality of longitudinal teeth, the length of which is at least equal to the width of the plate to be clamped and tensioned. These teeth engage equally long teeth on one side of a clamping bar interposed between said shaft and one of the side walls of said slot closely adjacent thereto.
  • one end of the plate is inserted into the narrow gap between said side wall of the slot and the adjacent side of the clamping bar which is left flat or smooth and the other plate end is fitted between the engaged teeth.
  • the shaft is turned in one direction the respective end of the plate is pulled into the slot while the other is held in the slot, whereby the plate is tautly clamped about the cylinder. Release of the plate is efi'ected by simply turning the shaft into the opposite direction.
  • the bent-off end portion of the plate inserted in said gap may have on its side facing the respective slot wall a pressed-in lengthwise rib engaged with a corresponding lengthwise groove in said slot wall, thereby forcing the respective plate end into intimate con tact with said slot wall.
  • the invention also encompasses a support of the shaft along its entire length by providing ribs or bars in the slot extending along the length of the shaft, parallel to the rotational axis thereof.
  • the bars also prevent access of dust or abrasive particles to the bearings of the shaft.
  • FIG. 1 is a cross-sectional view of a plate cylinder provided with a clamping device according to the invention, an initial step of the clamping operation being shown.
  • FIG. 2 is a sectional view similar to FIG. 1, but a further advanced step of the clamping operation being shown.
  • FIG. 3 is a sectional view similar to FIG. 2 and showing the completed clamping operation
  • FIG. 4 is a fragmentary longitudinal sectional view of the clamping device.
  • a plate cylinder 1 including a lengthwise peripheral slot 2 having a constricted mouth 20.
  • the slot may be of generally circular cross-section and extend along the entire width of cylinder 1; it should have a length at least equal to the width of plate 10 to be clamped.
  • the shaft is rotatably supported in slot 2.
  • the support of the shaft is diagrammatically indicated by trunnions 3a extending into walls 14 which may be visualized as constituting part of the frame structure of the press.
  • Rotation of the shaft is effected by means of .a conventional, preferably selfarresting worm gear 15. Worm gears of this kind are well known in the art.
  • the shaft is formed with lengthwise teeth 4 in mesh with teeth 5 formed of one side of a bar 6.
  • the other side of the bar is left substantially flat or smooth.
  • the fiat side of bar '6 faces a straight wall portion 7 of slot 2.
  • a shallow recess may be provided in the flat. side of bar 6 to improve the grip of the bar on the plate 10.
  • the wall portion 7 includes a lengthwise groove 8 which may have a V-shaped cross-section. Groove or notch 8 is engageable with a correspondingly shaped rib .1;1 pressed into the bent-off end portion 9 of plate 10 and extending across the width of the plate.
  • the tensioning of plate 10 can be readily controlled by the angle through which shaft 3 is turned. Release of the plate is effected by turning shaft 3 in counterclockwise direction.
  • two bars 13 are provided which are fitted in appropriate grooves 13a in the cylinder.
  • the bars extend lengthwise of slot 2 and parallel to the rotational axis of shaft 3.
  • fixed ribs may of course also be provided.
  • the two bars 13 are disposed substantially opposite the area of engagement between shaft 3 and bar 6.
  • the bars are preferably made of low wear material which also has suitable friction characteristics. Bars made of bronze or hardened steel have been found suitable.
  • a device for tautly clam-ping a bendable printing plate about the cylinder of a printing press comprising a cylinder having a lengthwise peripheral slot, a shaft rotatably supported in said slot, said shaft having several lengthwise peripheral teeth, a clamping bar fitted between said shaft and one side Wall of the slot parallel to said Wall, said bar having on its side facing the shaft lengthwise teeth engaged with the shaft teeth for displacing the bar in its plane by rotation of the shaft, the opposite side of the bar being substantially flat and defining a narrow gap with the adjacent slot wall, one end of said .plate being inserted into said gap between the flat s ide of the bar and said adjacent slot wall for clamping said plate end between said bar and said wall and the opposite end of said plate being inserted between the coacting teeth of the shaft and the bar in engagement with said teeth, rotation of the shaft in a predetermined direction displacing the bar and said opposite plate end deeper into said slot While said one plate end remains substantially stationary in reference to the bar thereby tensioning the plate about the
  • a device whereby the slot wa'll facing the substantially flat side of said bar has a length wise groove, and comprising a bendable printing plate having at its end to be inserted into said gap a lengthwise extending protrusion engageable with said groove.
  • a device wherein -at least one support bar is fitted int-o the slot between the shaft and the adjacent slot wall portion parallel to the axis of the shaft, said support bar supporting the shaft along the length thereof.
  • a device according to claim 1 wherein two support bars are provided in said slot circumferentially spaced in reference to the shaft and disposed substantially opposite to said engaged teeth.
  • a device comprising a drive means rotating said shaft, said drive means including a self-arresting gear drive.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US407506A 1964-04-25 1964-10-29 Printing plate clamping device for a printing press Expired - Lifetime US3276365A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER37780A DE1228627B (de) 1964-04-25 1964-04-25 Vorrichtung zum Befestigen einer biegsamen Druckplatte auf dem Formzylinder einer Rotationsdruckmaschine

Publications (1)

Publication Number Publication Date
US3276365A true US3276365A (en) 1966-10-04

Family

ID=7405309

Family Applications (1)

Application Number Title Priority Date Filing Date
US407506A Expired - Lifetime US3276365A (en) 1964-04-25 1964-10-29 Printing plate clamping device for a printing press

Country Status (3)

Country Link
US (1) US3276365A (de)
CH (1) CH412942A (de)
DE (1) DE1228627B (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3557695A (en) * 1967-07-29 1971-01-26 Roland Offsetmaschf Device for the fastening of a printing plate
US3782281A (en) * 1971-02-02 1974-01-01 Mirrow Co Self-tensioning flexible printing plate
US4100854A (en) * 1974-08-28 1978-07-18 Japan Society For Promotion Of Machine Industry Device for mounting resin plate onto plate cylinder
US4277164A (en) * 1978-07-14 1981-07-07 Olympia Werke Ag Photocopier photoconductive sheet holding device
US4587901A (en) * 1983-07-29 1986-05-13 Officine Meccaniche G. Cerutti S.P.A. Plate holding roller particularly for flexographic printing applications
US5062363A (en) * 1990-02-17 1991-11-05 Man Roland Druckmaschinen Ag Flexible printing plate attachment system
US5383401A (en) * 1994-02-22 1995-01-24 Heidelberg Druckmaschinen Ag Actuating device for clamping arrangement for printing plates in rotary printing presses
US5402722A (en) * 1992-12-24 1995-04-04 Koenig & Bauer Aktiengesellschaft Cylinder spindle tensioning assembly
US5778786A (en) * 1995-07-25 1998-07-14 Heidelberger Druckmaschinen Ag Plate clamping device for reducing the non-printing region
US6073558A (en) * 1998-07-20 2000-06-13 Heidelberger Druckmaschinen Ag Printing press having blanket cylinder with filler bar and blanket
US20090139418A1 (en) * 2004-05-19 2009-06-04 Kabushikikaisha Tokyo Kikai Seisakusho Gap filling member for blanket cylinder
US20220168868A1 (en) * 2020-12-01 2022-06-02 Fortune Extendables Corp. Abrasive wheel which can be provided with a sandpaper

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU371093A1 (ru) * 1970-04-17 1973-02-22 , вители Устройство для закрепления формной пластины на цилиндре
DE19542156C1 (de) * 1995-11-11 1997-05-15 Kba Planeta Ag Biegsame Druckplatte und Einrichtung zum Klemmen und Spannen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1774169A (en) * 1927-02-05 1930-08-26 Arthur E Chappell Roller for surfacing machines
US1853208A (en) * 1930-07-26 1932-04-12 Harris Seybold Potter Co Plate-clamp
US2119279A (en) * 1937-03-29 1938-05-31 William A Kerr Grinding wheel
US2186764A (en) * 1938-03-29 1940-01-09 Meisel Press Mfg Company Printing cylinder
US3020842A (en) * 1960-05-12 1962-02-13 Hoe & Co R Offset printing plate clamp
US3125023A (en) * 1964-03-17 Blanket tensioning means for the impression

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190205255A (en) * 1902-03-03 1903-02-05 Augustus David Klaber Improvements in or relating to Retaining Devices for Paper and the like Particularly Applicable for use in Duplicating Machines.
US2578406A (en) * 1948-05-15 1951-12-11 Time Inc Blanket clamp for blanket cylinders of printing presses

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125023A (en) * 1964-03-17 Blanket tensioning means for the impression
US1774169A (en) * 1927-02-05 1930-08-26 Arthur E Chappell Roller for surfacing machines
US1853208A (en) * 1930-07-26 1932-04-12 Harris Seybold Potter Co Plate-clamp
US2119279A (en) * 1937-03-29 1938-05-31 William A Kerr Grinding wheel
US2186764A (en) * 1938-03-29 1940-01-09 Meisel Press Mfg Company Printing cylinder
US3020842A (en) * 1960-05-12 1962-02-13 Hoe & Co R Offset printing plate clamp

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3557695A (en) * 1967-07-29 1971-01-26 Roland Offsetmaschf Device for the fastening of a printing plate
US3782281A (en) * 1971-02-02 1974-01-01 Mirrow Co Self-tensioning flexible printing plate
US4100854A (en) * 1974-08-28 1978-07-18 Japan Society For Promotion Of Machine Industry Device for mounting resin plate onto plate cylinder
US4277164A (en) * 1978-07-14 1981-07-07 Olympia Werke Ag Photocopier photoconductive sheet holding device
US4587901A (en) * 1983-07-29 1986-05-13 Officine Meccaniche G. Cerutti S.P.A. Plate holding roller particularly for flexographic printing applications
EP0443350B1 (de) * 1990-02-17 1994-12-21 MAN Roland Druckmaschinen AG Vorrichtung zum Aufspannen einer biegsamen Druckform auf einen Zylinder einer Rotationsdruckmaschine
US5062363A (en) * 1990-02-17 1991-11-05 Man Roland Druckmaschinen Ag Flexible printing plate attachment system
US5402722A (en) * 1992-12-24 1995-04-04 Koenig & Bauer Aktiengesellschaft Cylinder spindle tensioning assembly
US5383401A (en) * 1994-02-22 1995-01-24 Heidelberg Druckmaschinen Ag Actuating device for clamping arrangement for printing plates in rotary printing presses
US5778786A (en) * 1995-07-25 1998-07-14 Heidelberger Druckmaschinen Ag Plate clamping device for reducing the non-printing region
US6073558A (en) * 1998-07-20 2000-06-13 Heidelberger Druckmaschinen Ag Printing press having blanket cylinder with filler bar and blanket
US20090139418A1 (en) * 2004-05-19 2009-06-04 Kabushikikaisha Tokyo Kikai Seisakusho Gap filling member for blanket cylinder
US7681499B2 (en) * 2004-05-19 2010-03-23 Kabushikikaisha Tokyo Kikai Seisakusho Gap filling member for blanket cylinder
US20220168868A1 (en) * 2020-12-01 2022-06-02 Fortune Extendables Corp. Abrasive wheel which can be provided with a sandpaper

Also Published As

Publication number Publication date
DE1228627B (de) 1966-11-17
CH412942A (de) 1966-05-15

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