EP0739725B1 - Schnellbefestigungssystem für Druckplattenwechsel - Google Patents

Schnellbefestigungssystem für Druckplattenwechsel Download PDF

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Publication number
EP0739725B1
EP0739725B1 EP19950500066 EP95500066A EP0739725B1 EP 0739725 B1 EP0739725 B1 EP 0739725B1 EP 19950500066 EP19950500066 EP 19950500066 EP 95500066 A EP95500066 A EP 95500066A EP 0739725 B1 EP0739725 B1 EP 0739725B1
Authority
EP
European Patent Office
Prior art keywords
plate
hydraulic
printing plate
clamp
over
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
EP19950500066
Other languages
English (en)
French (fr)
Other versions
EP0739725A1 (de
Inventor
Francisco Ruiz Marin
Rafael Serrano Garcia-Gil
Francisco Malo Guijarro
Pedro Mazquiaran Bris
Angel Luis Uzquiza Contreras
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.)
TGA INGENIERIA GRAFICA, S.L.
Original Assignee
TGA INGENIERIA GRAFICA SL
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 TGA INGENIERIA GRAFICA SL filed Critical TGA INGENIERIA GRAFICA SL
Priority to EP19950500066 priority Critical patent/EP0739725B1/de
Priority to DE69528040T priority patent/DE69528040D1/de
Publication of EP0739725A1 publication Critical patent/EP0739725A1/de
Application granted granted Critical
Publication of EP0739725B1 publication Critical patent/EP0739725B1/de
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
    • B41F27/1231—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 tangential to support surface

Definitions

  • DE-U-8710030 discloses a system according to the preamble of claim 1.
  • the present invention is referred to a fixing and adjusting system of the printing plate to the plate cylinder in an offset press.
  • the printing plate fastening systems known in the offset presses mounts the printing plate's edges into the plate cylinder using a mechanical tightening device with screws or eccentrics, tensioning later the printing plate by the movement of the clamps in the peripherical direction of the cylinder using strews or hydraulic systems.
  • the present invention has the object to avoid these inconvenients, and brings a fixing and adjusting system of the printing plate to a plate cylinder of offset presses, though the use, for the fixing over the whole lenght of the printing plate ends, of the advantages offered by the hydraulic system used on the system of teeth, that locks over their whole lenght the edges of the printing plate, with a substantial reduction of the time of realization for the fixing plate operation, substantially in the preparation and final setting of the offset presses at the beginning of their work operations.
  • the plate cylinder has a parallel hollow to its geometrical shaft, enough to lodge two hydraulic clamps that fixes both ends of the printing plate, that will be adjusted all around the cylinder area.
  • the printing plate is introduced between the teeth of the clamp, and the actioning of the hydraulic circuit permits, in the question of one second, the fixing, over its whole lenght, of the printing plate ends, adjusting itself later the plate all along the cyilinder by any of the known methods of plate adjusting.
  • the advantages deduced by this invention consists essentially, as mentioned above, of the use of the hydraulic device in order to realize the tightening and longitudinal adjusting of a printing plate to its cylinder, securing the uniform tightening over the lenght of the printing plate edges, from the point of view of time reduction and uniform tightening over the whole lenght of the printing plate ends.
  • the canalization of the hydraulic fluid that arrives from the hydraulic pump, drawing 2 (36), to the main canalization, drawings 1 and 2 (7), is realized through all the lenght of the hydraulic clamp, connects with the canalization (8) and (9) that are realized in spaced intervals over the whole body (2) lenght of the hydraulic clamp.
  • the fluid moves a piston (10), wich brings an U-collar (11) and an O-ring (12), over the lower tooth (4), that moves the printing plate (6) upwards and with a uniform pressure over the whole lenght of the upper tooth (5), that does not move.
  • the hermeticity of the main canalization (7) all along the body (2) of the clamp, is warranted by an O-ring (17), that is intercalated between the body (2) and the upper tooth (5), and these two parts of the hydraulic clamp are fixed by screws (19), wich have warranted their hermeticity by special copper washers (18), specially used in hydraulic circuits.
  • the actioning of the hydraulic pump, as the regulating of the hydraulic pressure is detailed in the following manner, as the drawing 2;
  • the bolt (26) is actioned by a hexagonal wrench turning it 90° over its shaft until a position determinated by a mechanical positioning top realized by the rod (27), that moves a shaft (28) guided over a holder (29);
  • the shaft (28) is threaded to the shaft (30) wich moves the piston (31) over the pump body (32) passing the hydraulic fluid through the drilled hole (25) to the main canalization (7) of the hydraulic clamp body.
  • the sealed system of the pump assy is warranted by two U-collars (33) and (34).
  • U-collars (33) and (34) In order to protect the body of the pump (32) from wear of the metalic parts from wich it is made it is provided with some guides (35) of plastic material, preferably Tephlon.
  • the return of the piston (31) to its rest position is accomplished by two components: a) The pressure held by the hydraulic fluid, within its run; and b) The power held by the spring (36), that warrants the return of the piston to its initial position.
  • the regulation of the pressure held by the hydraulic pump is realized by the regulator (37), that turns in one or another direction, increases or decreases the distance between the shaft (28) and the shaft (30), making that the piston (31), in its compression position, increases or decreases the compression chamber (38) originating with this movement a variation of the pressure all along the whole hydraulic circuit.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Claims (1)

  1. ES BESTEHT AUS EIN SCHNELLSPANNSCHIENEN SYSTEM FÜR OFFSETMACHINEN DRUCKPLATTEN. DIE SCHIENEN SIND AUF DER PLATTENCYLINDER EINGEBAUT UN EIN INTEGRIERTES SYSTEM BESTEHT AUS EIN PLATTENSPANNZYLINDER, ZWEI (OBERE UND UNTERE) KLAPPEN MIT ZÄHNEN IN DER PARALLELE ZU DER ZYLINDERGENERATRIZGUTTER SO BREIT WIE DIE PLATTENLÄNGE. DIESE KLAPPEN SIND SO STUDIERT UM DIE BEIDE KANNTEN DER DRUCKPLATTE ZU HALTEN, UN DIE UNTERE KLAPPE IS DURCH EIN HYDRAULISCHE HUBZYLINDER ANGETRIEBEN. SO DASS DIE HÄLT DIE PLATTE ZWICHEN DIE OBERE UND DIE UNTERE KLAPPEN.
EP19950500066 1995-04-28 1995-04-28 Schnellbefestigungssystem für Druckplattenwechsel Expired - Lifetime EP0739725B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19950500066 EP0739725B1 (de) 1995-04-28 1995-04-28 Schnellbefestigungssystem für Druckplattenwechsel
DE69528040T DE69528040D1 (de) 1995-04-28 1995-04-28 Schnellbefestigungssystem für Druckplattenwechsel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950500066 EP0739725B1 (de) 1995-04-28 1995-04-28 Schnellbefestigungssystem für Druckplattenwechsel

Publications (2)

Publication Number Publication Date
EP0739725A1 EP0739725A1 (de) 1996-10-30
EP0739725B1 true EP0739725B1 (de) 2002-09-04

Family

ID=8221651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950500066 Expired - Lifetime EP0739725B1 (de) 1995-04-28 1995-04-28 Schnellbefestigungssystem für Druckplattenwechsel

Country Status (2)

Country Link
EP (1) EP0739725B1 (de)
DE (1) DE69528040D1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT296348B (de) * 1968-05-02 1972-01-15 Polygraph Leipzig Schnellspanneinrichtung zum befestigen biegsamer druckplatten auf formzylindern
DD253977A1 (de) * 1986-11-28 1988-02-10 Polygraph Leipzig Klemmvorrichtung fuer biegsame druckplatten
DE4214206C2 (de) * 1992-04-30 1995-06-29 Roland Man Druckmasch Vorrichtung zum Betätigen einer Klemmschiene gegenüber der Spannschiene des Plattenzylinders einer Rotationsdruckmaschine, insbesondere Bogenoffsetdruckmaschine

Also Published As

Publication number Publication date
EP0739725A1 (de) 1996-10-30
DE69528040D1 (de) 2002-10-10

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