EP0100185A2 - Druckplatte - Google Patents

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Publication number
EP0100185A2
EP0100185A2 EP83304105A EP83304105A EP0100185A2 EP 0100185 A2 EP0100185 A2 EP 0100185A2 EP 83304105 A EP83304105 A EP 83304105A EP 83304105 A EP83304105 A EP 83304105A EP 0100185 A2 EP0100185 A2 EP 0100185A2
Authority
EP
European Patent Office
Prior art keywords
plate
printing plate
saddle
creased
printing
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Withdrawn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
EP83304105A
Other languages
English (en)
French (fr)
Other versions
EP0100185A3 (de
Inventor
John Richard Marsh
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.)
Auto Masters Ltd
Original Assignee
Auto Masters Ltd
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 Auto Masters Ltd filed Critical Auto Masters Ltd
Publication of EP0100185A2 publication Critical patent/EP0100185A2/de
Publication of EP0100185A3 publication Critical patent/EP0100185A3/de
Withdrawn legal-status Critical Current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
    • B41F27/14—Devices for attaching printing elements or formes to supports for attaching printing formes to intermediate supports, e.g. adapter members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L29/00—Devices for attaching printing elements or formes to supports
    • B41L29/22—Devices for attaching printing elements or formes to supports for attaching printing formes to intermediate supports, e.g. adapter members

Definitions

  • This invention is concerned with printing plates and, more particularly with flexible printing plates and means for securing such plates to printing cylinders.
  • a printing plate is produced by a photographic process.
  • a backing sheet of flexible material of substantially larger area than the image to be reproduced thereon is given a sensitised coating which is then exposed to the image.
  • the exposed sheet undergoes various treatment stages, e.g. developing, washing, etching.
  • a central area of the sheet is now occupied by the image which is comprised of the residual coating and thus stands proud of the backing sheet.
  • the finished sheet has to be trimmed to form the printing plate.
  • Improved apparatus for cutting printing plates is described in our European Patent Application No. 82 300732.3.
  • printing plates are made of thin aluminium or mild steel sheets and attached either directly to a shim of a printing cylinder or to a saddle which is itself attached to the cylinder.
  • the securement mechanism therefor comprises a simple retaining means at the leading edge of the plate, as considered in the direction of rotation of the cylinder, and a tensioning means at the trailing edge of the plate.
  • printing plates have been developed which are made of thick paper or plastics material.
  • the fold line of the plate extends along the edge of the saddle with the leading edge of the plate clamped against the undercut saddle face by the clamping strip and the image-bearing central portion of the plate held tightly against the curved surface of the saddle.
  • attachment means for holding a creased printing plate comprising a shim or saddle member having an undercut leading end face adapted to clamp the leading end of the printing plate, a curved peripheral surface for supporting the central region of the plate and at the junction of said end face and said peripheral surface a recess for securing a projecting crease rib of said creased plate.
  • the drawings show a printing cylinder 1, which is rotatable, in use, in the direction shown by arrow 2 and which is provided with a pair of saddles 3 to each of which a respective printing plate 4 can be attached by a locking mechanism according to the invention described in our European Applications Nos. 82 300253.0 and 82 300254.8.
  • the locking mechanism comprises holding means 5 which is located along the leading edge 6 of the saddle 3 with respect to the direction of rotation of the cylinder 1.
  • the holding means 5 comprises a simple clamp arrangement in which the edge 6 of the saddle 3 is undercut to provide an acute angle 7.
  • Attached to the saddle 3 along the edge 6 is a metal or plastics strip 8 which is formed so as to define a clip with the edge 6. In this way, the leading edge 9 of the printing plate 4 can be retained by being pushed firmly between the strip 8 and the edge 6 so that the strip 8 clamps the plate 4 to the edge 6 and the plate 4 folds over the angle 7 against the surface 10 of the saddle 3.
  • the locking mechanism comprises a locking arrangement 12 to hold and tension the trailing edge 13 of the printing plate 4 opposing the leading edge 9 thereof against the surface 10 of the saddle. Further details of the construction of the locking arrangement 12 are contained in the aforesaid European Patent Applications.
  • Fig. 1 shows the locking arrangement 12 in the release position ready for receiving the trailing edge 13 of a printing plate 4.
  • the holding means 5 is about to receive the leading edge 9 of what may be assumed for the purposes of illustration to be the same printing plate 4.
  • the printing plate 4 is fitted to the saddle 3 by inserting the leading edge 9 in the direction of the arrow in Fig. 1 into the nip defined by the edge 6 of the saddle 3 and the clamping strip 8.
  • the trailing edge 13 of the plate 4 is then inserted.
  • Fig. 2 shows both leading and trailing edges 9,13 of the printing plate 4 fully inserted, and finger pressure being used to push the locking arrangement 12 towards the locking position shown in Fig. 3.
  • the leading edge 9 of the printing plate 4 is shown pre-folded in Fig. 1.
  • the present invention uses a creasing technique which may, however, be entirely conventional save in its application to the folding of a printing plate.
  • the creasing operation is of the kind frequently used in the carton-making industry whereby a creasing rule engages a cooperating groove so as to trap and deform the material to be creased.
  • the resultant crease has a well-defined rib at one side and an indentation at the opposite side.
  • a creasing operation combined with a cutting operation for flexible printing plates is described in our co-pending European Application No. 82 300732.3.
  • the creasing operation produces on the inside of the fold a crease rib or projection 14 of predictable, regular profile. Accordingly, it is possible to provide at the angle 7 of the saddle leading edge h a recess 15 in which the crease rib 14 is accommodated. By suitably dimensioning the recess 15 with respect to the crease rib 14 it is possible to ensure that the leading end region 4a of the printing plate 4 in advance of the image portion 4b thereof lies flat on the saddle 3 and has no tendency to project or ride up to cause unacceptable marking-up.
  • the printing plate is creased with a 2-Point creasing rib (0.71 mm) and we have found that the crease rib so produced can be readily accommodated in a recess of rectangular profile (as illustrated in Fig. 4) having sides of length 1 mm.
  • the recess need not necessarily have the shape shown in Fig. 4. It could, for example, have two sides of unequal length, more than two sides (i.e. polygonal in profile), or a curved profile.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP83304105A 1982-07-26 1983-07-13 Druckplatte Withdrawn EP0100185A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8221542 1982-07-26
GB8221542 1982-07-26

Publications (2)

Publication Number Publication Date
EP0100185A2 true EP0100185A2 (de) 1984-02-08
EP0100185A3 EP0100185A3 (de) 1985-05-22

Family

ID=10531916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304105A Withdrawn EP0100185A3 (de) 1982-07-26 1983-07-13 Druckplatte

Country Status (1)

Country Link
EP (1) EP0100185A3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643093A (en) * 1985-03-01 1987-02-17 Minnesota Mining And Manufacturing Company Double-creased lithoplate and method of mounting on a web press
WO2005014286A2 (de) * 2003-07-25 2005-02-17 Goss International Montataire S.A. Sleeve-like cover with slit for a cylinder in a press

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR88018E (fr) * 1965-05-07 1966-06-17 Creusot Forges Ateliers Blanchet pour rotative d'imprimerie, et rotative munie de ce blanchet
US3715981A (en) * 1970-06-29 1973-02-13 Hamilton Tool Co Fluid actuator and lock for printing plate cylinders
US3893394A (en) * 1973-03-28 1975-07-08 Wood Industries Inc Blanket cylinder slot arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR88018E (fr) * 1965-05-07 1966-06-17 Creusot Forges Ateliers Blanchet pour rotative d'imprimerie, et rotative munie de ce blanchet
US3715981A (en) * 1970-06-29 1973-02-13 Hamilton Tool Co Fluid actuator and lock for printing plate cylinders
US3893394A (en) * 1973-03-28 1975-07-08 Wood Industries Inc Blanket cylinder slot arrangement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643093A (en) * 1985-03-01 1987-02-17 Minnesota Mining And Manufacturing Company Double-creased lithoplate and method of mounting on a web press
WO2005014286A2 (de) * 2003-07-25 2005-02-17 Goss International Montataire S.A. Sleeve-like cover with slit for a cylinder in a press
JP2007504013A (ja) * 2003-07-25 2007-03-01 ゴス インターナショナル モンタテール ソシエテ アノニム 印刷機における胴のためのスリットを備えたスリーブ状カバー
WO2005014286A3 (de) * 2003-07-25 2008-01-03 Goss Int Montataire Sa Sleeve-like cover with slit for a cylinder in a press
CN101180183B (zh) * 2003-07-25 2010-12-15 戈斯国际蒙塔泰尔公司 用于印刷机滚筒的罩盖与滚筒的组合装置及安装方法

Also Published As

Publication number Publication date
EP0100185A3 (de) 1985-05-22

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT DE GB IT NL

PUAL Search report despatched

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AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19860123

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MARSH, JOHN RICHARD