EP0330736B2 - Tensionless plate lock-up - Google Patents

Tensionless plate lock-up Download PDF

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Publication number
EP0330736B2
EP0330736B2 EP19880118939 EP88118939A EP0330736B2 EP 0330736 B2 EP0330736 B2 EP 0330736B2 EP 19880118939 EP19880118939 EP 19880118939 EP 88118939 A EP88118939 A EP 88118939A EP 0330736 B2 EP0330736 B2 EP 0330736B2
Authority
EP
European Patent Office
Prior art keywords
locking
lock
undercut
longitudinal slot
plate
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
EP19880118939
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0330736B1 (en
EP0330736A3 (en
EP0330736A2 (en
Inventor
Alan Robert Wallschlaeger Sr.
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.)
Goss International LLC
Original Assignee
Goss Graphic Systems Inc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22582075&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0330736(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Goss Graphic Systems Inc filed Critical Goss Graphic Systems Inc
Publication of EP0330736A2 publication Critical patent/EP0330736A2/en
Publication of EP0330736A3 publication Critical patent/EP0330736A3/en
Publication of EP0330736B1 publication Critical patent/EP0330736B1/en
Application granted granted Critical
Publication of EP0330736B2 publication Critical patent/EP0330736B2/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
    • B41F27/1262—Devices for attaching printing elements or formes to supports for attaching flexible printing formes without tensioning means
    • B41F27/1268—Devices for attaching printing elements or formes to supports for attaching flexible printing formes without tensioning means by self-locking or snap-on means

Definitions

  • the present invention relates to offset lithographic presses and more particularly to lock-up mechanisms for holding the thin, flexible litho plates to the surface of the plate roll.
  • the art of printing by offset lithography involves the use of thin, flexible plates which are basically planographic, that is without relief, and which are treated so that the surfaces have areas which attract or repel oil and water to create areas of image differentiation.
  • To mount the litho plates on the surface of the press plate rolls it is essential to insure that the plate conforms closely to the outer surface of the plate roll. Mounting is usually effected by forming a longitudinal slot in the plate roll and inserting thereinto one of a variety of biasing or clamping devices called lockups. Often the leading edge of the plate is bent back on itself so that the bent portion can fit over the edge formed in the roll by the longitudinal slot and then be held in position by some form of spring or clamp. Alternatively, mechanisms have been provided in which the plate leading edge has been rigidly clamped.
  • a plate lock-up mechanism which is somewhat related to that of US-A-3,757,691 is US-A-3,626,848 where a spring member is used to hold down the leading edge of plate 11 around the undercut side of the slot and cam 40 is used to urge the hook 35 against the trailing end 13. Examples of other plate lock up mechanisms may be found in US-A-3,608,847 and US-A-3,095,811.
  • EP-A-0 039 765 a lock-up mechanism as defined in the preamble of claim 1 is disclosed.
  • a clamping body having wedge-like disposed compression surfaces is pressed against two leaf spring arms, each of which is in contact with an undercut locking surface of the printing cylinder for clamping the ends of the flexible printing plate between one of the undercut locking surfaces and the respective leaf spring arm.
  • FR-A-1 352 571 another lock-up mechanism for holding a flexible printing plate to a printing cylinder is disclosed.
  • this known lock-up mechanism the ends of the flexible printing plate are introduced into the opening of a clamping bar disposed within the slot of the printing cylinder.
  • the opening of the clamping bar is defined by two surfaces inclined relative to each other.
  • a cylindrical clamping bar is disposed within the opening of the other clamping bar and supported by an elastic finger fixed to the printing cylinder.
  • the outer clamping bar having said opening for said cylindrical inner clamping bar is radially moveable relative to the inner clamping bar.
  • the ends of the printing plate are clamped between the inner cylindrical clamping bar and one of the two inclined surfaces, with this surface contacting the ends of the printing plate being a radially extending surface and the other surface inclined thereto serving as a runway for the cylindrical inner clamping bar.
  • An additional object of this invention is to provide a printing plate lock-up mechanism which the plate can be installed on the plate roll and removed therefrom without the necessity of having installation or removal equipment.
  • An additional object of this invention is to provide a plate lock-up mechanism in which the width of the plate gap is held to a minimum.
  • a further object of this invention is to provide an improved plate lock-up mechanism which can be adapted for use with plate rolls having longitudinal slots that were structured for use with previously existing plate lock-up mechanisms.
  • numeral 10 indicates a section through a portion of a plate roll upon which a plate 11 disposed.
  • the plate roll 10 is formed with longitudinal groove 12 in its outer surface 13, the longitudinal slot extending all the way across the width of the plate roll.
  • Longitudinal slot 12 is shown as being undercut to define a pair of opposed surfaces 15 which provide locking surfaces against which both the leading and the trailing ends of plate 11 can be abutted. From the slot inwardly, the substantially flat or planar clamping surfaces 15 terminate in a curved wall, the shape being of no particular significance, since the shape is largely dictated by the machining operation selected for forming the slot.
  • Fig. 1 it can be seen that the leading edge 20 of plate 11 has been folded back at an acute angle to the plate (and to the surface of the roll) so that it fits over the nose portion 21 of the roll 10.
  • the trailing edge 22 is not, unlike the leading edge, bent back on itself but rather extends over the opening of longitudinal slot 12 so that it is in abutment with the innermost surface of leading edge 20.
  • Each locking means has a curved outer surface 26 for contacting the ends of the flexible plate and clamping them against the locking surface 15.
  • the radius of curvature of each of the locking elements 25 is such that the contact between the curved outer surface with the substantially planar surface 15 is one of basically line contact, so that firm contact is made with the surface of the printing plate.
  • each of the locking elements 25 is substantially cylindrical in shape.
  • a spacer bar 30 is disposed within the slot.
  • This bar has a plurality of upwardly and outwardly extending mounting posts or spacing studs 31 each of which is surrounded by a compression spring 32.
  • the bottom part of each of the elements 25 contains a cylindrical bore 33 for reception of the upper end of a spring 32.
  • FIGs. 3 and 4 illustrate the manner in which this can be effected.
  • the slot 35 has been formed with only one undercut surface 36 while the other side wall of the slot is essentially vertical.
  • a spacer bar mechanism 38 that is secured into a small secondary recess by means of a bolt 39.
  • the use and positioning of such spacer bars is common in the art and does not form part of this invention.
  • the generally cylindrical locking element 40 corresponds to the locking element 25 of Fig. 1 and it is urged outwardly by means of compression springs 41.
  • Fig. 3 illustrates the manner in which this can be effected. Referring first to Fig. 3, it will be seen that the slot 35 has been formed with only one undercut surface 36 while the other side wall of the slot is essentially vertical.
  • a spacer bar mechanism 38 that is secured into a small secondary recess by means of a bolt 39.
  • the generally cylindrical locking element 40 corresponds to the locking element 25 of Fig. 1 and it is urged outwardly by means of compression spring
  • the bottom part of spring 41 is received into an appropriately formed recess 42 in the bottom of slot 33 while the upper end of spring 41 is received into a recess formed in the bottom part of a vertically movable spacer 43.
  • the spacer 43 is formed with a generally arcuately formed receptacle-like surface 44 into which the locking element 40 can be received. It should be pointed out that the spacing element 43 contains an integrally formed wall 45 on each end which acts to define the lateral limits of the arcuate surface 44 and prevent locking element 40 from moving laterally in the general direction of the length of longitudinal slot 33.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Clamps And Clips (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP19880118939 1988-02-29 1988-11-14 Tensionless plate lock-up Expired - Lifetime EP0330736B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16164088A 1988-02-29 1988-02-29
US161640 1988-02-29

Publications (4)

Publication Number Publication Date
EP0330736A2 EP0330736A2 (en) 1989-09-06
EP0330736A3 EP0330736A3 (en) 1990-08-22
EP0330736B1 EP0330736B1 (en) 1993-10-13
EP0330736B2 true EP0330736B2 (en) 2000-01-19

Family

ID=22582075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880118939 Expired - Lifetime EP0330736B2 (en) 1988-02-29 1988-11-14 Tensionless plate lock-up

Country Status (4)

Country Link
EP (1) EP0330736B2 (ja)
JP (1) JPH07121581B2 (ja)
CA (1) CA1307421C (ja)
DE (2) DE3884939T3 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005093C1 (en) * 1990-02-17 1991-06-20 Man Roland Druckmaschinen Ag, 6050 Offenbach, De Forme clamp for printing cylinder - has channel in cylinder with spindle to clamp form eccentrically
DE9004130U1 (de) * 1990-04-10 1990-06-13 MAN Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum Spannen von Platten auf einen Formzylinder einer Rotationsdruckmaschine
EP0492138B1 (de) * 1990-12-21 1995-11-15 Heidelberger Druckmaschinen Aktiengesellschaft Schnellklemmvorrichtung
DE4319167C2 (de) * 1993-06-09 1995-04-27 Roland Man Druckmasch Vorrichtung zum Befestigen einer biegsamen Druckplatte
DE4415622C2 (de) * 1994-05-04 1996-11-28 Roland Man Druckmasch Vorrichtung zum Befestigen einer biegsamen Druckplatte
DE4415621A1 (de) * 1994-05-04 1995-11-09 Roland Man Druckmasch Vorrichtung zum Befestigen einer biegsamen Druckplatte
DE29507523U1 (de) * 1995-05-05 1995-07-06 Albert-Frankenthal Ag, 67227 Frankenthal Vorrichtung zum Befestigen einer Gummitucheinheit auf einem Gummizylinder
JP2004090378A (ja) * 2002-08-30 2004-03-25 Seiken Graphics Kk 刷版
DE102006012760A1 (de) * 2006-03-17 2007-09-20 Man Roland Druckmaschinen Ag Vorrichtung zum Befestigen einer flexiblen Bespannung auf einen Druckzylinder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1352571A (fr) * 1963-04-02 1964-02-14 Maschf Augsburg Nuernberg Ag Dispositif de fixation pour clichés flexibles ou blanchets
JPS5821586B2 (ja) * 1976-07-05 1983-05-02 三菱重工業株式会社 版締装置
JPS5528503Y2 (ja) * 1977-01-31 1980-07-08
JPS563167Y2 (ja) * 1977-01-31 1981-01-23
DE3018249C2 (de) * 1980-05-13 1982-09-09 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum Befestigen von biegsamen Druckplatten auf dem Plattenzylinder von Rotationsdruckmaschinen

Also Published As

Publication number Publication date
EP0330736B1 (en) 1993-10-13
JPH01229631A (ja) 1989-09-13
DE3884939T2 (de) 1994-02-03
DE330736T1 (de) 1990-02-08
DE3884939D1 (de) 1993-11-18
EP0330736A3 (en) 1990-08-22
EP0330736A2 (en) 1989-09-06
DE3884939T3 (de) 2000-12-28
JPH07121581B2 (ja) 1995-12-25
CA1307421C (en) 1992-09-15

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