EP0531741A1 - Dispositif pour fixer le bord avant d'un cliché dans une machine à imprimer - Google Patents

Dispositif pour fixer le bord avant d'un cliché dans une machine à imprimer Download PDF

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Publication number
EP0531741A1
EP0531741A1 EP92113873A EP92113873A EP0531741A1 EP 0531741 A1 EP0531741 A1 EP 0531741A1 EP 92113873 A EP92113873 A EP 92113873A EP 92113873 A EP92113873 A EP 92113873A EP 0531741 A1 EP0531741 A1 EP 0531741A1
Authority
EP
European Patent Office
Prior art keywords
clamping
radius
plate
cylinder
leading edge
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.)
Withdrawn
Application number
EP92113873A
Other languages
German (de)
English (en)
Inventor
Nikolaus Dr. Spiegel
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
Publication of EP0531741A1 publication Critical patent/EP0531741A1/fr
Withdrawn legal-status Critical Current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
    • B41F27/1262—Devices for attaching printing elements or formes to supports for attaching flexible printing formes without tensioning means

Definitions

  • the invention relates to a plate leading edge fastening of a printing plate to printing presses with a clamping device with two flat clamping surfaces running essentially at right angles to the cylinder radius, the clamping device being located below the lateral surface of the cylinder.
  • Printing plates are clamped on the front edge by means of a clamping device, placed around the plate cylinder and inserted and tensioned with the rear edge in a clamping and tensioning device. Since the inking rollers roll on the plate cylinder, the clamping device for the front edge as well as the clamping and tensioning device for the rear edge must be below the outer surface of the cylinder. For the detection of the printing plate, it is therefore necessary to fold or bend it so that the printing plate can be received in the fastening devices for the front and rear edges.
  • leading edge fastenings of the type mentioned at the outset as are known from the prior art, for example from DE 34 01 351 A1, there is such a strong bend that the pressure plate is permanently deformed.
  • the reuse of such a printing plate is only possible to a limited extent, for example if a skilled printer inserts it by hand and its position is corrected with several printing attempts by often tedious positioning.
  • the exact positioning of the leading edge is of crucial importance in this process for the achievement of a register-containing print.
  • a further development in printing machines is in the direction of simplifying the plate change, whereby the development is in the direction of partial or complete automation.
  • Printing plates that are to be used repeatedly and that have a bend in the leading edge area embossed from the last clamping process cannot be used in the plate cylinder without the laborious manual work mentioned or cannot be used with the required accuracy.
  • Automation of the plate clamping or the plate feed to the cylinder requires that the plates have no or only insignificant plastic deformations.
  • the invention has for its object to provide a plate leading edge attachment of the type mentioned, in which an attachment of the printing plate leading edge is possible without significant deformation.
  • the object is achieved in that the radius of the outer surface of the plate cylinder in the area in front of the insertion opening for inserting the pressure plate is smaller than the cylinder radius and that this radius is at least so large that no permanent deformation of the same can occur due to the tensioning of a commercially available pressure plate .
  • the advantage of the invention is that the deformations due to the clamping are limited to the range of the elastic deformations or at least only slight plastic deformations occur, so that reusability is also possible with an automatic plate change.
  • FIGS. 1 and 2 differ only with regard to the design of the symbolically illustrated clamping devices 3.
  • the features of the plate front edge fastening, which are essential to the invention, for a printing plate 4 on the plate cylinder 6 of a printing press are present in both exemplary embodiments.
  • Clamping devices 3 for fastening a pressure plate are provided in such a way that the clamping devices are arranged below the lateral surface 5 of the plate cylinder 6.
  • the clamping devices 3 have plane clamping surfaces 10 to 13 which extend essentially at right angles to the cylinder radius 1.
  • the pressure plates 4 are inserted into an insertion opening 14 for clamping onto the plate cylinder 6 and clamped between the upper and lower clamping surfaces.
  • the printing plates are placed around the plate cylinder and gripped at their rear edges by means of a clamping and tensioning device (not shown), also clamped and clamped around the cylinder.
  • a pressure plate 4 is also subjected to a strong tensile force in the region in front of its front edge held in the clamping device 3.
  • the insertion of the front edge of the pressure plate 4 in such a clamping device 3 requires, due to the position of the clamping device below the lateral surface of the cylinder, that it has a greater curvature in the area 15 in front of the insertion opening 14 than when it was placed on the lateral surface 5 of the plate cylinder 6 is the case.
  • the area 15 in front of the insertion opening 14 can only have such a length that it does not protrude into the surface to be printed.
  • the cylinder radius 1 must be preserved over the entire area to be printed.
  • the area 15 with the radius 2 must therefore have the size with sufficient certainty that plastic deformation of the printing plate does not occur, but must not be so large that it protrudes into the printing area.
  • the exact dimension for this radius 2, and thus also for the area 15 in front of the insertion opening must be determined on the basis of the conditions of the individual machine and the commercial printing plates used.
  • the radius 2 can be different over the area 15 as long as it is within the specified limits.
  • the area 15 can be designed, for example, as a curve which, starting from the cylinder radius 1 towards the clamping point, has a continuously decreasing radius.
  • FIG. 1 shows a clamping device 3 with a movable lower clamping bar 7 and a fixed upper clamping bar 8.
  • the movable lower clamping bar 7 with the lower clamping surface 10 is moved downwards to remove the printing plate 4, the printing plate 4 is removed and a new printing plate is inserted.
  • the terminal block 7 is pressed against the upper fixed terminal block 8.
  • the clamping device 3 consists of a movable upper clamping bar 9 with an upper clamping surface 12 which is moved upwards to remove the pressure plate 4 and can thereby emerge from the outer surface 5 of the plate cylinder 6.
  • the movable upper clamping bar 9 is pulled down while clamping the pressure plate, this movable upper clamping bar 9 again having to move under the lateral surface 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP92113873A 1991-08-31 1992-08-14 Dispositif pour fixer le bord avant d'un cliché dans une machine à imprimer Withdrawn EP0531741A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19914129046 DE4129046A1 (de) 1991-08-31 1991-08-31 Plattenvorderkantenbefestigung einer druckplatte an druckmaschinen
DE4129046 1991-08-31

Publications (1)

Publication Number Publication Date
EP0531741A1 true EP0531741A1 (fr) 1993-03-17

Family

ID=6439619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92113873A Withdrawn EP0531741A1 (fr) 1991-08-31 1992-08-14 Dispositif pour fixer le bord avant d'un cliché dans une machine à imprimer

Country Status (6)

Country Link
EP (1) EP0531741A1 (fr)
JP (1) JPH05220931A (fr)
CN (1) CN1070608A (fr)
AU (1) AU2136592A (fr)
CA (1) CA2074339A1 (fr)
DE (1) DE4129046A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5778786A (en) * 1995-07-25 1998-07-14 Heidelberger Druckmaschinen Ag Plate clamping device for reducing the non-printing region

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4950538B2 (ja) * 2006-04-03 2012-06-13 株式会社小森コーポレーション マグネットシリンダに装着されるプレート
DE102014214660A1 (de) 2013-07-25 2015-01-29 Koenig & Bauer Aktiengesellschaft Verfahren und Vorrichtung zum Wechseln von gebrauchten Druck-oder Lackplatten an einer Druckmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577073A (en) * 1947-09-27 1951-12-04 Davidson Corp Plate clamp means
DE1173916B (de) * 1962-07-28 1964-07-16 Rena Bueromaschinen Fabrik G M Vorrichtung zum Einspannen einer Druck-form auf der Drucktrommel eines Rotations-vervielfaeltigers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2613688C2 (de) * 1976-03-31 1983-05-26 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Gummituchzylinder für eine Bogen-Rotationsoffsetdruckmaschine
DD147079A1 (de) * 1979-11-05 1981-03-18 Hans Johne Bogenrotationsdruckmaschine
DD204886A1 (de) * 1982-05-05 1983-12-14 Victor Hefftler Rotationsdruckmaschine
DE3401351A1 (de) * 1984-01-17 1985-07-25 Horst 5600 Wuppertal Kieper Schnellspannleiste zum befestigen einer druckplatte an druckmaschinen
DD253977A1 (de) * 1986-11-28 1988-02-10 Polygraph Leipzig Klemmvorrichtung fuer biegsame druckplatten

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577073A (en) * 1947-09-27 1951-12-04 Davidson Corp Plate clamp means
DE1173916B (de) * 1962-07-28 1964-07-16 Rena Bueromaschinen Fabrik G M Vorrichtung zum Einspannen einer Druck-form auf der Drucktrommel eines Rotations-vervielfaeltigers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5778786A (en) * 1995-07-25 1998-07-14 Heidelberger Druckmaschinen Ag Plate clamping device for reducing the non-printing region

Also Published As

Publication number Publication date
AU2136592A (en) 1993-03-04
JPH05220931A (ja) 1993-08-31
CN1070608A (zh) 1993-04-07
CA2074339A1 (fr) 1993-03-01
DE4129046A1 (de) 1993-03-11

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GBC Gb: translation of claims filed (gb section 78(7)/1977)
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