EP0325535B1 - Verfahren zum Befestigen und Positionieren von Offsetdruckplatten mit magnetischer Unterstützung und Druckplatte und Offsetdruckmaschine zur Durchführung des Verfahrens - Google Patents

Verfahren zum Befestigen und Positionieren von Offsetdruckplatten mit magnetischer Unterstützung und Druckplatte und Offsetdruckmaschine zur Durchführung des Verfahrens Download PDF

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Publication number
EP0325535B1
EP0325535B1 EP89400151A EP89400151A EP0325535B1 EP 0325535 B1 EP0325535 B1 EP 0325535B1 EP 89400151 A EP89400151 A EP 89400151A EP 89400151 A EP89400151 A EP 89400151A EP 0325535 B1 EP0325535 B1 EP 0325535B1
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EP
European Patent Office
Prior art keywords
plate
cylinder
plates
offset printing
carrying cylinder
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
EP89400151A
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English (en)
French (fr)
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EP0325535A1 (de
Inventor
Jean-Marie Nouel
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.)
Individual
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Individual
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Publication date
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Priority to AT89400151T priority Critical patent/ATE88670T1/de
Publication of EP0325535A1 publication Critical patent/EP0325535A1/de
Application granted granted Critical
Publication of EP0325535B1 publication Critical patent/EP0325535B1/de
Anticipated expiration legal-status Critical
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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
    • B41F27/02—Magnetic devices

Definitions

  • the present invention relates to offset printing machines, offset printing plates and a method for hanging and positioning offset printing plates in offset printing machines.
  • the magnetic fixing of the offset plates only proves advantageous insofar as one implements, for this fixing, means which allow not only a quick attachment of the plates but also a precise positioning of said plates in order to reduce the duration of the settings.
  • printer part of the plate that is to say the part of the plate which includes the ink-absorbing and aquaphile zones. It is therefore first of all necessary, by known means, to ensure that this printing part of the plate is exactly positioned in relation to the plate itself, that is to say in relation to fixed marks ( sides of the plate, lines drawn on the plate, lines of holes made on one edge of the plate ...) integral with this plate (or forming part of the plate).
  • the means for exactly positioning the printer part on the plate are, as indicated above, known.
  • Said plates comprise a magnetizable support (they generally have a steel base) and along at least one of their lateral edges openings suitably arranged to cooperate with the pins arranged on the plate cylinder, in the vicinity of at least one of its edges.
  • the invention therefore proposes the use, in offset, of magnetic latching.
  • the magnetic snap is known per se. It consists of the fact that the plate cylinder has, flush with its surface, a sufficient number of magnets for the plate to be securely attached to it. These magnets can have the most diverse shapes, they are generally in the form of studs or benches arranged along the generatrices of the cylinders.
  • said magnetic coupling is implemented with pins, on the projecting part of a larger plate cylinder.
  • FIG. 3 there is shown, in section along II-II, an improvement of the invention consisting in providing a slight depression 6 over a certain width of the cylinder.
  • a depression for example and preferably, a magnet 4.
  • the offset plate When the offset plate is placed around the cylinder, at least one of the ends of said plate (the end capable of being torn off during rolling) will be attracted by magnet 4. Obviously, the two ends of said plate can be attracted by magnet 4 (or by other magnets mounted in said depression 6).
  • prior “bending” is meant that the plate is subjected, before it is placed on the plate cylinder, to permanent deformation such that said plate, initially planar, is in the form of a cylinder whose diameter is of the order of magnitude of the diameter of the plate cylinder, and even preferably slightly smaller.
  • This bending operation obviously implies that the nature of the steel which constitutes the base of the plate is suitably chosen, this choice being within the reach of any specialist in this material.
  • this bending operation involves a certain elongation of the outer surface portion of the plate; avoid any excessive deformation and make sure, by bending under identical or similar conditions for the various plates, to always have an identical elongation of said surface portion. This possibility, thanks to the prior bending to control and make reproducible from one plate to another, this elongation phenomenon is important because it allows the realization of a very precise positioning of the plate.
  • a plate provided, along and in the vicinity of at least one of its lateral edges, with suitable openings.
  • the shape, dimensions (generally the diameter) and the relative position of these openings must correspond to the pins with which these openings must cooperate. Given the high mechanical properties of the steel-supported plates and taking into account the prior bending under controlled conditions, it is possible to provide a very precise adaptation of said openings with said nipples.
  • the pins on which the plate openings are threaded are arranged on the plate cylinder, in the vicinity of an edge of said cylinder and in a plane perpendicular to the axis of the cylinder.
  • the offset plates most often have, on their edges, openings intended to ensure the positioning of the printing part of the plate with respect to said plate. It is obviously possible to use these openings to, in cooperation with pins arranged on the cylinder, position the plate, but experience proves that in current machines, such pins would not be positioned beyond the cylinders and rollers neighboring the plate cylinder, which would require sometimes expensive arrangements of said cylinders and rollers. Thus, most often, it is preferred to use other openings, often in greater numbers, to ensure the positioning of the plates.
  • the plates are maintained and positioned by pins located in the vicinity of the edge of the plate cylinder and no longer by means (jaws for example) arranged along a generator of said cylinder. It follows that the sides of the plate which are arranged, after positioning, along a generator of said cylinder are free, that is to say are only held by means of the magnets arranged on the cylinder. In general, this arrangement does not give rise to difficulties (all the more so as a person skilled in the art will have the magnets suitably on said cylinder) but it may happen that, when handling the plate, the edges of that -this (edges positioned along the generatrices) are slightly deformed; this deformation could cause the plate to tear off during rolling.
  • the plate cylinder could comprise, on a portion of said cylinder corresponding to the ends of the plate, a slight depression in which at least one magnet is willing. It is understood that thanks to this depression, the ends of the plates will always be slightly reentrant (that is to say will be maintained within the theoretical circle formed by the plate cylinder) and cannot, therefore, undergo damage, even in the event of accidental deformation of the ends of the plate.
  • the plate cylinder of this machine is 1045 mm wide.
  • this plate cylinder is of sufficient width to be able to use there in the vicinity of the edges of the fixing studs according to the invention, said cylinder has been replaced by a plate cylinder (of perfectly cylindrical shape) of 1,100 mm in width comprising, flush with its surface, magnets arranged along generatrices of said cylinder.
  • offset plate with magnetic support use will be made, for example, of a plate comprising a black iron support whose mechanical qualities are those of European standard T 61 and whose thickness is 25/100.
  • This black iron support was covered with a layer of hydrophilic matt chromium and a positive photosensitive encrophilic layer.
  • This plate has the particularity of comprising, on its two sides, openings which correspond exactly to the pins present on the plate cylinder.
  • This plate after insolation, development and cooking, is passed through a rolling machine which makes it undergo a permanent deformation such that in the state of rest said plate is in the form of an open cylinder whose diameter is order of magnitude (and even preferably slightly smaller) of the diameter of the plate cylinder.
  • the plate is then placed around the plate cylinder by inserting the plate through the pressure end side and then placing this plate so as to thread the pins into the holes in the plate.
  • This process provides rapid and precise positioning of the plate.
  • the width of the plate is the same as that of the plate cylinder and that said plate includes openings on its two lateral sides.
  • This arrangement is not essential since it is possible to use for a plate cylinder with a width L two plates each having a width a little less than L / 2; each of these plates will have active openings only on one of its lateral sides.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Screen Printers (AREA)

Claims (3)

  1. Offset-Druckmaschinen umfassend einen Druckträger (1), einen Drucktuchzylinder und einen Druckzylinder, wobei der besagte Druckträger (1) dazu bestimmt ist, mit dem besagten Drucktuchzylinder und Feucht- (3) und Farbwalzen (2) in Kontakt zu kommen, dadurch gekennzeichnet, daß:
    - der besagte Druckträger (1) Magneten (4) aufweist;
    - der besagte Druckträger (1) eine Breite aufweist, die geringfügig über der Breite des besagten Drucktuchzylinders und der besagten Walzen (2, 3) liegt;
    - der Druckträger (1) auf mindestens einem Teil, der so übersteht, eine Reihe von Befestigungsansätzen (5) aufweist.
  2. Offset-Druckplatten für Maschinen nach Anspruch 1, dadurch gekennzeichnet, daß sie eine magnetisierbare Stütze und mindestens entlang einem ihrer Seitenränder Öffnungen aufweisen, die so angeordnet sind, daß sie zu Ansätzen (5) passen, die auf dem Druckträger (1) angeordnet sind, und zwar in der Nähe mindestens eines Randes des besagten Trägers.
  3. Befestigungs- und Positionierungsverfahren für eine Offset-Druckplatte nach Anspruch 2 in Maschinen nach Anspruch 1, dadurch gekennzeichnet, daß die Platte nach Lichtbestrahlung, Entwicklung und evtl. Brennen:
    - so gebogen wird, daß sie eine dauerhafte Verformung aufweist, wodurch die Platte die Form eines offenen Zylinders erhält, dessen Durchmesser in etwa dem Durchmesser des Druckträgers (1) entspricht, vorzugsweise etwas darunter liegt;
    - dann auf die Befestigungsansätze (5) gesetzt wird, die am besagten Druckträger (1) nahe mindestens eines Rands desselben vorgesehen sind, und zwar mit Hilfe der passend angeordneten Öffnungen, die an mindestens einem seiner Seitenränder vorgesehen wurden;
    - und gegen den besagten Druckträger (1) mit Hilfe der Magneten (4) gedrückt werden, die dieser aufweist.
EP89400151A 1988-01-21 1989-01-19 Verfahren zum Befestigen und Positionieren von Offsetdruckplatten mit magnetischer Unterstützung und Druckplatte und Offsetdruckmaschine zur Durchführung des Verfahrens Expired - Lifetime EP0325535B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89400151T ATE88670T1 (de) 1988-01-21 1989-01-19 Verfahren zum befestigen und positionieren von offsetdruckplatten mit magnetischer unterstuetzung und druckplatte und offsetdruckmaschine zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8800664 1988-01-21
FR8800664A FR2626214B1 (fr) 1988-01-21 1988-01-21 Procede d'accrochage et de positionnement de plaques d'impression offset a support magnetique, ainsi que plaques et machines d'impression offset utilisables pour sa mise en oeuvre

Publications (2)

Publication Number Publication Date
EP0325535A1 EP0325535A1 (de) 1989-07-26
EP0325535B1 true EP0325535B1 (de) 1993-04-28

Family

ID=9362499

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400151A Expired - Lifetime EP0325535B1 (de) 1988-01-21 1989-01-19 Verfahren zum Befestigen und Positionieren von Offsetdruckplatten mit magnetischer Unterstützung und Druckplatte und Offsetdruckmaschine zur Durchführung des Verfahrens

Country Status (4)

Country Link
EP (1) EP0325535B1 (de)
AT (1) ATE88670T1 (de)
DE (1) DE68906168T2 (de)
FR (1) FR2626214B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6925936B2 (en) 2000-04-13 2005-08-09 Heidelberger Druckmaschinen Ag Imaging assembly for imaging printing plate including magnetic drum and registration system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2681885B1 (fr) * 1991-10-01 1998-09-04 Colas Sa Dispositif d'epandage d'une emulsion d'accrochage d'enrobes butumineux ou de fluides analogues, et machine de construction de chaussees comportant un tel dispositif.
DE19543316A1 (de) * 1995-11-21 1997-05-22 Bielomatik Leuze & Co Bearbeitungs-Werkzeug zur Bearbeitung von Lagen-Material o. dgl.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0236741A2 (de) * 1986-02-07 1987-09-16 R. R. Donnelley & Sons Company Druckzylinder mit einziehbarem Plattenregistrierstift und Montageverfahren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1629376A (en) * 1926-11-13 1927-05-17 Howard T Buck Attaching means for multigraph signature plates
CH323933A (de) * 1954-08-30 1957-08-31 Herzer Alfred Emil Magnetisierbarer, planer und biegsamer Druckformträger für Rakeltiefdruck
GB1505548A (en) * 1976-12-09 1978-03-30 Plastotype Ltd Printing apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0236741A2 (de) * 1986-02-07 1987-09-16 R. R. Donnelley & Sons Company Druckzylinder mit einziehbarem Plattenregistrierstift und Montageverfahren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6925936B2 (en) 2000-04-13 2005-08-09 Heidelberger Druckmaschinen Ag Imaging assembly for imaging printing plate including magnetic drum and registration system

Also Published As

Publication number Publication date
FR2626214A1 (fr) 1989-07-28
DE68906168D1 (de) 1993-06-03
FR2626214B1 (fr) 1995-05-12
EP0325535A1 (de) 1989-07-26
ATE88670T1 (de) 1993-05-15
DE68906168T2 (de) 1993-11-18

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