US3276364A - Clamping device for an offset printing press - Google Patents

Clamping device for an offset printing press Download PDF

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Publication number
US3276364A
US3276364A US407412A US40741264A US3276364A US 3276364 A US3276364 A US 3276364A US 407412 A US407412 A US 407412A US 40741264 A US40741264 A US 40741264A US 3276364 A US3276364 A US 3276364A
Authority
US
United States
Prior art keywords
blanket
shaft
slot
cylinder
clamping device
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
US407412A
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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 US3276364A publication Critical patent/US3276364A/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
    • B41F27/125—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 on a curvilinear path, e.g. by winding on a roll

Definitions

  • the invention relates to a device for tautly clamping a blanket upon the blanket cylinder of an offset printing press and, more particularly, to a blanket clamping device for use with a cylinder having a lengthwise peripheral slot in which a clamping shaft or spindle is rotatably mounted, the ends of the blanket being held within the slot by the shaft.
  • a more specific object of the invention is :to provide a novel and improved clamping device of the general kind above referred to with which a blanket can be tautly clamped to the cylinder by simply inserting the two respective ends of the blanket into the device and turning the shaft thereof.
  • Another more specific object of the invention is to provide a novel and improved clamping device of the general kind above referred to which supports the shaft along its entire length, thereby preventing deformation of the shaft by its own weight or the pull of the taut blanket and also access of dust and abrasive particles to the bearings for the shaft in the cylinder slot.
  • a clamping shaft or spindle having a lengthwise peripheral slot of preferably substantially rectangular cross-section.
  • One of the edges of the shaft slot terminates in an inwardly turned flange which is engageable with a shoulder along one end of the blanket upon insertion of said end into the shaft slot.
  • the other side of said blanket end is formed with a laterally protruding flange engageable with a shoulder along one side of the opposite blanket end upon insertion of the latter end into the shaft slot also.
  • the two inserted blanket ends are locked to each other and in the shaft slot and are partly wrapped around the shaft when the same is turned in the direction in which the flanged edge of the shaft slot constitutes the trailing edge of the slot. Due to such partial wrapping of the blanket ends about the shaft, the blanket can be conveniently stretched to any desired extent.
  • the invention also provides that the shaft is supported along its entire length or at least along the length of the slot therein by one or preferably several support bars which are fitted in the cylinder slot between the wall portions of the cylinder defining the slot and the peripheral wall of the shaft.
  • FIG. 1 is a cross-sectional view of a blanket cylinder provided with a clamping device according to the invention, the figure showing an initial step of the clamping of a blanket,
  • FIG. 2 is a cross-section similar to FIG. 1 but showing a more advanced stage of the clamping operation
  • FIG. 3 is a cross-sectional view similar to FIG. 2 and showing the completed clamping and stretching operation
  • FIG. 4 is a fragmentary longitudinal view of the blanket cylinder and its support.
  • a blanket cylinder 1 including a lengthwise slot 2 of preferably generally circular crosssection and joined to the peripheral wall of the cylinder by a constricted portion 2a.
  • the slot 2 may extend throughout the entire length of the cylinder but should have at least a length equal to the Width of the blanket 8 to be clamped to the cylinder.
  • a clamping shaft or spindle 3 is mounted within the slot 2 and extends along the length thereof.
  • the shaft is supported by means of trunnions 3a in wall 5 which may constitute part of the frame structure of the press and is rotatable by means of a worm drive diagrammatically indicated at 4.
  • Shaft 3 is provided with a lengthwise slot or groove 6 of preferably generally rectangular crosssection.
  • One of the side walls of the slot has at its upper rim an inwardly extending lengthwise flange or shoulder 7.
  • the blanket 8 has along its respective opposite edges reinforcing strips 9 and 10 respectively of generally U-shaped cross-section suitably secured thereto.
  • Strip 9 has along the edge of one of its branches :a shoulder or flange 11 outwardly facing in reference to the respective blanket end.
  • the blanket end mounting strip 10 is first inserted into slot 6, as it is shown in FIG. 1.
  • the second blanket end is then inserted into slot 6.
  • the straight branch of strip 9 now abuts against flange or shoulder 7 of shaft 3.
  • Flange or shoulder 11 on the other branch of strip 10 is close to overlying the respective branch of strip 10 but still clear of the same.
  • the crosswise width of slot 6 is such that the two blanket ends can be conveniently brought into the afore-described positions shown in the figure.
  • the U-shaped cross-sectional configuration of strips 9 and 10 has an inherent flexibility so that it is generally possible to insert and withdraw the reinforced blanket ends even if the crosswise width of slot 6 is not such as to permit a ready placement of the two strips in positions in which strip 9 is clear of strip 10.
  • support bars 12 are fitted in grooves in the walls of slot 2. These bars extend parallel to the axis of shaft 3 and are preferably made of a low wear material which also shows good friction properties to prevent accidental rotation of the shaft within slot 2. Bars made of bronze or hardened steel have been found to be suitable.
  • a clamping device for tautly mounting a blanket on a blanket cylinder of a printing press, said clamping device comprising, in combination, a blanket cylinder having in its peripheral wall a slot extending across the length of the cylinder, a clamping shaft having a single lengthwise extending peripheral slot of substantially rectangular cross-section, bearing means rotatably supporting said shaft in said slot of the blanket cylinder, the peripheral edge of one side wall of the shaft sl'ot terminating in an inwardly turned flange, and a blanket having along one of its ends on one side a shoulder positioned to underlie said flange of the shaft slot upon insertion of said blanket end into the shaft slot whereby said blanket end is locked in said shaft slot, and on the other side an outwardly protruding flange and having at its end opposite to said one end a shoulder positioned to underlie said blanket flange upon insertion of said opposite blanket end between said one blanket end and the other side wall of the shaft slot and turning of said shaft into the rotational direction in which said flange
  • a clamping device wherein a reinforcement strip of generally U-shaped cross-section is secured to each of said ends of the blanket extending across the width thereof, one of said strips having said outwardly turned flange along one lengthwise edge of one of its branches to form said blanket flange, the rims of the other branches of said strips constituting said other shoulders.
  • a clamping device according to claim 2 wherein the crosswise width of said shaft slot is in excess of the combined cross-sectional width of said reinforcement strips and the blanket ends mounting the strips.
  • a clamping device comprising at least one support bar lengthwise fitted into said cylinder slot parallel to said shaft between the respective Wall portion of the cylinder and said shaft to support the latter along its length.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US407412A 1964-04-29 1964-10-29 Clamping device for an offset printing press Expired - Lifetime US3276364A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER37803A DE1198376B (de) 1964-04-29 1964-04-29 Anordnung zum Befestigen des Gummituches auf dem Gummizylinder von Offsetdruckmaschinen

Publications (1)

Publication Number Publication Date
US3276364A true US3276364A (en) 1966-10-04

Family

ID=7405320

Family Applications (1)

Application Number Title Priority Date Filing Date
US407412A Expired - Lifetime US3276364A (en) 1964-04-29 1964-10-29 Clamping device for an offset printing press

Country Status (4)

Country Link
US (1) US3276364A (de)
CH (1) CH411935A (de)
DE (1) DE1198376B (de)
GB (1) GB1083146A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584580A (en) * 1969-08-25 1971-06-15 Leipzig Veb Druckmasch Werke Rubber sheet tensioning device for offset printing machines
US3757690A (en) * 1971-08-11 1973-09-11 Polygraph Leipzig Printing plate clamping device
US4217825A (en) * 1978-06-30 1980-08-19 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Assembly for clamping and tightening a blanket over a blanket cylinder in a printing press
EP0142647A2 (de) * 1983-11-14 1985-05-29 Rockwell International Corporation Knebelverschluss mit zwischengeschaltetem Mitnehmer
US4587901A (en) * 1983-07-29 1986-05-13 Officine Meccaniche G. Cerutti S.P.A. Plate holding roller particularly for flexographic printing applications
US5255056A (en) * 1990-04-20 1993-10-19 Minnesota Mining And Manufacturing Co. Photoconductor film clamping and tensioning system and method of use
US5791244A (en) * 1996-01-22 1998-08-11 Heidelberger Druckmaschinen Ag Device for applying a printing blanket to a blanket cylinder of a rotary printing press
US6601508B1 (en) * 1999-03-26 2003-08-05 Heidelberger Druckmaschinen Ag Device for clamping printing forms in clamping channels of reduced size
US20080217798A1 (en) * 2007-03-09 2008-09-11 Industrial Technology Research Institute Mold structure and the manufacturing method thereof
CN110103572A (zh) * 2019-05-26 2019-08-09 昆山瑞源智能装备有限公司 一种单张铁皮印涂辊橡皮布卷轴结构

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3128105C2 (de) * 1981-07-16 1985-11-14 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Vorrichtung zum Halten des unteren Aufzuges eines zweilagigen Aufzuges auf der Mantelfläche eines Druckzylinders in Druckmaschinen
DE3219741C1 (de) * 1982-05-26 1987-11-12 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Gummituchspannvorrichtung
DE102007006042B3 (de) * 2007-02-07 2008-09-18 Koenig & Bauer Aktiengesellschaft Verfahren zum Spannen eines Aufzugs und eine Spannvorrichtung
CN114030289B (zh) * 2021-11-05 2023-04-18 江苏富台机械科技有限公司 一种水性印刷机多用挂版机构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1853208A (en) * 1930-07-26 1932-04-12 Harris Seybold Potter Co Plate-clamp
GB756867A (en) * 1953-09-02 1956-09-12 Crabtree & Sons Ltd R A new or improved means for securing blankets to the impression cylinders of printing machines
US2946282A (en) * 1954-04-20 1960-07-26 Hoe & Co R Printing machine plate lock-up
US2973710A (en) * 1958-03-14 1961-03-07 Hantscho George Printing press rollers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE641173C (de) * 1933-11-11 1937-01-23 Koenig & Bauer Schnellpressfab Aufspannvorrichtung fuer biegsame Druckplatten auf dem Formzylinder von Rotationsdruckmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1853208A (en) * 1930-07-26 1932-04-12 Harris Seybold Potter Co Plate-clamp
GB756867A (en) * 1953-09-02 1956-09-12 Crabtree & Sons Ltd R A new or improved means for securing blankets to the impression cylinders of printing machines
US2946282A (en) * 1954-04-20 1960-07-26 Hoe & Co R Printing machine plate lock-up
US2973710A (en) * 1958-03-14 1961-03-07 Hantscho George Printing press rollers

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584580A (en) * 1969-08-25 1971-06-15 Leipzig Veb Druckmasch Werke Rubber sheet tensioning device for offset printing machines
US3757690A (en) * 1971-08-11 1973-09-11 Polygraph Leipzig Printing plate clamping device
US4217825A (en) * 1978-06-30 1980-08-19 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Assembly for clamping and tightening a blanket over a blanket cylinder in a printing press
US4587901A (en) * 1983-07-29 1986-05-13 Officine Meccaniche G. Cerutti S.P.A. Plate holding roller particularly for flexographic printing applications
EP0142647A2 (de) * 1983-11-14 1985-05-29 Rockwell International Corporation Knebelverschluss mit zwischengeschaltetem Mitnehmer
EP0142647A3 (en) * 1983-11-14 1986-02-19 Rockwell International Corporation Interfacing cam and toggle lockup
US5255056A (en) * 1990-04-20 1993-10-19 Minnesota Mining And Manufacturing Co. Photoconductor film clamping and tensioning system and method of use
US5791244A (en) * 1996-01-22 1998-08-11 Heidelberger Druckmaschinen Ag Device for applying a printing blanket to a blanket cylinder of a rotary printing press
US6601508B1 (en) * 1999-03-26 2003-08-05 Heidelberger Druckmaschinen Ag Device for clamping printing forms in clamping channels of reduced size
US20080217798A1 (en) * 2007-03-09 2008-09-11 Industrial Technology Research Institute Mold structure and the manufacturing method thereof
CN110103572A (zh) * 2019-05-26 2019-08-09 昆山瑞源智能装备有限公司 一种单张铁皮印涂辊橡皮布卷轴结构

Also Published As

Publication number Publication date
DE1198376B (de) 1965-08-12
CH411935A (de) 1966-04-30
GB1083146A (en) 1967-09-13

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