EP0142728B1 - Dispositif de courbage pour plaques d'impression offset - Google Patents

Dispositif de courbage pour plaques d'impression offset Download PDF

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Publication number
EP0142728B1
EP0142728B1 EP84112690A EP84112690A EP0142728B1 EP 0142728 B1 EP0142728 B1 EP 0142728B1 EP 84112690 A EP84112690 A EP 84112690A EP 84112690 A EP84112690 A EP 84112690A EP 0142728 B1 EP0142728 B1 EP 0142728B1
Authority
EP
European Patent Office
Prior art keywords
plate
printing plate
bending
bending device
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.)
Expired
Application number
EP84112690A
Other languages
German (de)
English (en)
Other versions
EP0142728A2 (fr
EP0142728A3 (en
Inventor
Lothar Stadler
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 EP0142728A2 publication Critical patent/EP0142728A2/fr
Publication of EP0142728A3 publication Critical patent/EP0142728A3/de
Application granted granted Critical
Publication of EP0142728B1 publication Critical patent/EP0142728B1/fr
Expired 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
    • B41F27/1287—Devices for attaching printing elements or formes to supports for attaching flexible printing formes devices for bending the printing plates or the printing plate ends

Definitions

  • the invention relates to a bending device for offset printing plates according to the preamble of claim 1.
  • Known bending devices of this type enable the plate ends to be bent precisely to a specific pressure plate dimension.
  • positioning rails or positioning pins are used to align the printing plates before bending, so that the completely bent printing plate always assumes the same position as the register of the print image located thereon.
  • the finished printing plate is then clamped onto the plate cylinder, the tangential clamping force causing the plate to expand to a certain extent.
  • the stretching force corresponds to the applied clamping force, so that after the clamping process the plate is properly seated on the plate cylinder.
  • the plate is bent slightly shorter to achieve the same clamping force than the purely theoretical handling requires.
  • the object of the present invention is to provide a bending device for offset printing plates, which register-based clamping of the printing plate on positive clamping systems, such as these.
  • B. find use in modern register systems, allows without the printing plate is damaged or destroyed and still a uniformly good fit of the plate is guaranteed on the plate cylinder.
  • the object is achieved by the inventive features of the characterizing part of claim 1.
  • the advantage of the solution created can be seen in the fact that, with simple means and without time-consuming adjustment work, it is possible to adjust the length of the plate bent in each case to that of the plate's own elongation.
  • the printer only has to preselect the respective amount of deflection when using a particular plate in order to then find the optimum length for this type of plate, i. H. to get the optimal tension.
  • the differences in length of the individual printing plate types that are taken into account are very small and are often only a fraction of a millimeter.
  • the bending device shown in FIGS. 1 and 2 consists of a support plate 1 and a lowerable hold-down device 2, between which the pressure plate 3 is clamped.
  • Known positioning means which are not shown in the drawing, are provided for laying the printing plate in register.
  • bending beams 4 are articulated to the support plate 1, which, as shown in broken lines, can assume an upper starting position. After inserting the pressure plate, the bending beams 4 are moved downward and thus bend the pressure plate ends 5, 6 downward in accordance with the angular shape of the support plate 1.
  • the dimension between the bent printing plate ends corresponds to the dimensions given by the platen 1.
  • the two printing plate ends 5 and 6 thus run exactly parallel to one another and are angled a little closer, as would be the purely theoretical clamping length on the printing plate cylinder. Due to the force required for the expansion of the plate, a tangential clamping force is exerted on the plate, which ensures that the plate is clamped tightly and sits well on the plate cylinder.
  • An adjusting means in the form of an eccentric shaft 7 is provided approximately in the middle of the support plate 1 and runs parallel to the support plate 1.
  • the eccentric outer surface 8 thereof can be raised more or less relative to the plate plane of the support plate 1, so that when a new pressure plate 3 is placed on it, it is deflected from the straight line by the holding-down device 2 when it is clamped.
  • a recess 9 is provided in the hold-down device 2. This deflection of the pressure plate 3 from the straight line causes an extension of the Distance between the two bending edges on the support plate 1. This slight deflection makes it possible to reduce the expansion of the clamped pressure plate on the plate cylinder.
  • FIG. 3 shows the tangential clamping force F on the ordinate and the elongation path A s on the abscissa.
  • the straight line e1 shows z. B. the increase in elongation with increasing clamping force a bimetal plate and e2 the elongation behavior of an aluminum plate.
  • Line 10 represents the ideal clamping force, it being clear that the expansion path at 0 s is of different lengths for the two types of printing plates listed.
  • Figure 4 shows the eccentric shaft 7 with its eccentrically offset pin 11, which is mounted in a bearing block 12, which in turn is attached to a base plate 13 together with the support plate 1.
  • a handwheel 15 is attached, via which the eccentric shaft 7 can be rotated sensitively.
  • a disc 16 with a scale 17 is attached to the extension, which indicates the respective position in conjunction with an arrow 18.
  • the position 19 could, for. B. for the aluminum plate and position 20 for the bimetallic plate.
  • a spring-loaded ball catch 21 is provided.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (3)

1. Dispositif de pliage pour plaques d'impression offset, comprenant une table d'appui (1) à laquelle des barres de pliage (4) sont respectivement articulées sur les deux côtés de tête opposés, un presseur (2) pouvant être abaissé et servant à presser la plaque d'impression (3), ainsi que des moyens de positionnement permettant de plier les deux extrémités (5, 6) de la plaque d'impression à une longueur de plaque d'impression déterminée en la maintenant au repérage, caractérisé en ce que, pour l'adaptation aux différents comportements d'allongement des différentes sortes de plaques d'impression, il est prévu, entre les deux extrémités pliées (5, 6) de la plaque d'impression, un moyen actionneur disposé parallèlement aux barres de pliage (4) et qui peut être pressé contre la surface de la plaque d'impression, pour écarter ainsi cette surface de son plan d'appui.
2. Dispositif de pliage selon la revendication 1, caractérisé en ce que le moyen actionneur est un arbre excentrique (7) dont la surface latérale (8), qu'on peut faire tourner excentriquement, entre en contact avec la plaque d'impression (3), de sorte que, lorsqu'on tourne l'arbre excentrique (7), la plaque d'impression (3) est écartée du plan d'appui d'une distance qui est fonction de la course de rotation.
3. Dispositif de pliage selon les revendications 1 et 2, caractérisé en ce qu'on peut faire tourner l'arbre excentrique (7) au moyen d'un bouton moleté (15) et régler sa position au moyen d'une graduation (17).
EP84112690A 1983-11-19 1984-10-20 Dispositif de courbage pour plaques d'impression offset Expired EP0142728B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3341924A DE3341924C2 (de) 1983-11-19 1983-11-19 Biegevorrichtung für Offsetdruckplatten
DE3341924 1983-11-19

Publications (3)

Publication Number Publication Date
EP0142728A2 EP0142728A2 (fr) 1985-05-29
EP0142728A3 EP0142728A3 (en) 1986-02-19
EP0142728B1 true EP0142728B1 (fr) 1989-01-11

Family

ID=6214786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112690A Expired EP0142728B1 (fr) 1983-11-19 1984-10-20 Dispositif de courbage pour plaques d'impression offset

Country Status (4)

Country Link
US (1) US4598568A (fr)
EP (1) EP0142728B1 (fr)
JP (1) JPS60120058A (fr)
DE (1) DE3341924C2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539586A1 (de) * 1985-11-08 1987-05-14 Roland Man Druckmasch Verfahren zum aufbringen eines schutzbelages auf einen druckwerkzylinder mit vorrichtungen zur durchfuehrung des verfahrens
DE3739173A1 (de) * 1987-11-19 1989-06-01 Feintool Int Holding Verfahren und vorrichtung zum biegen von werkstuecken
DE3943566A1 (de) * 1989-11-20 1991-05-23 Koenig & Bauer Ag Druckplatte
DE3938477A1 (de) * 1989-11-20 1991-05-23 Koenig & Bauer Ag Druckplattenabkantvorrichtung
DE4306237A1 (de) * 1993-02-27 1994-09-01 Heidelberger Druckmasch Ag Einrichtung zur Einstellung des Schrägregisters in einer Spanneinrichtung zum Einspannen von Druckplatten in einer Offsetdruckmaschine
DE19516368C2 (de) * 1995-05-04 1999-09-23 Neumeister Geb Gmbh Verfahren und Vorrichtung zur Anpassung der Lage von Druckplatten an die Verformung des zu bedruckenden Papieres
US5699740A (en) * 1996-06-17 1997-12-23 Creo Products Inc. Method of loading metal printing plates on a vacuum drum
US5987949A (en) * 1997-03-18 1999-11-23 Heidelburg Harris, Inc. Plate scanner--bending device
DE10338374A1 (de) * 2003-08-21 2005-03-17 Koenig & Bauer Ag Vorrichtung zum Zuführen von Druckplatten zu einer Druckplattenwechsel-Einrichtung

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US412254A (en) * 1889-10-08 Mills
US864325A (en) * 1906-05-04 1907-08-27 Mcdonald Machine Company Can-forming machine.
US1710985A (en) * 1927-01-31 1929-04-30 Monighan Mfg Corp Excavating-bucket-forming machine
US2190423A (en) * 1937-12-06 1940-02-13 Motor Products Corp Windshield frame bending machine
GB983523A (en) * 1962-10-11 1965-02-17 Rubery Owen & Company Ltd Improvements relating to load-supporting plates or panels
DE2036490A1 (de) * 1970-07-23 1972-01-27 Maschf Augsburg Nuernberg Ag Verfahren und Vorrichtung zum paßgerechten Befestigen biegsamer Druckplatten auf, dem Formzylinder von Mehrfarben-Bogenoffset-Rotationsdruckmaschinen
US3677059A (en) * 1971-02-19 1972-07-18 Burroughs Corp Lithoplate bender
US3733872A (en) * 1971-07-15 1973-05-22 C Gregoire Roller bender for offset printing plates
DE2628249C3 (de) * 1976-06-24 1984-08-02 Heinz 5653 Leichlingen Metje Biegevorrichtung für Offset-Druckplatten
JPS5338263A (en) * 1976-09-21 1978-04-08 Toshiba Corp Plasma treating apparatus of semiconductors
DE3221489C2 (de) * 1982-06-07 1985-03-28 Heinz 5653 Leichlingen Metje Biegevorrichtung für Offsetdruckplatten

Also Published As

Publication number Publication date
US4598568A (en) 1986-07-08
EP0142728A2 (fr) 1985-05-29
DE3341924A1 (de) 1985-05-30
DE3341924C2 (de) 1987-03-26
JPH0418548B2 (fr) 1992-03-27
EP0142728A3 (en) 1986-02-19
JPS60120058A (ja) 1985-06-27

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