EP0005435B1 - Procédé pour obtenir une impression avec plusieurs couleurs avec recouvrement exact des couleurs - Google Patents

Procédé pour obtenir une impression avec plusieurs couleurs avec recouvrement exact des couleurs Download PDF

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Publication number
EP0005435B1
EP0005435B1 EP79100765A EP79100765A EP0005435B1 EP 0005435 B1 EP0005435 B1 EP 0005435B1 EP 79100765 A EP79100765 A EP 79100765A EP 79100765 A EP79100765 A EP 79100765A EP 0005435 B1 EP0005435 B1 EP 0005435B1
Authority
EP
European Patent Office
Prior art keywords
sheet
grippers
gripper
group
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
Application number
EP79100765A
Other languages
German (de)
English (en)
Other versions
EP0005435A1 (fr
Inventor
Druckmaschinen Aktiengesellschaft Heidelberger
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 EP0005435A1 publication Critical patent/EP0005435A1/fr
Application granted granted Critical
Publication of EP0005435B1 publication Critical patent/EP0005435B1/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
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers

Definitions

  • the invention relates to a method for achieving register-accurate multi-color printing with a sheet-fed rotary offset printing machine, in which the sheet is transferred from a gripper bridge with a rigidly designed gripper bar of a cylinder to a corresponding gripper bridge of a subsequent cylinder.
  • correction devices which deform the leading edge of the sheet in or against the direction of sheet travel after printing.
  • AT-B-303766 shows a sheet transfer drum whose central gripper bridge area is adjustable in the circumferential direction, while the outer areas of the gripper bridge are rigidly arranged. When the middle gripper bridge area is adjusted, the outer grippers of the non-adjustable gripper bridge areas are closed, but the inside grippers are opened so that the front edge of the sheet can be deformed without distortion.
  • These known correction devices are very complex and only serve to correct an already occurring tight printing. A tension is imposed on the bow.
  • the object of the invention is to remove or reduce the tensions in the sheet leading edge area after the sheet transfer, but before the next start of printing.
  • the brief opening and closing of all or some of the grippers gives the leading edge of the sheet sufficient freedom for the desired relaxation. Since the sheet is wrapped around the cylinder, there is a tendency to straighten the leading edge anyway due to the curvature in the area of the sheet leading edge. This leveling force helps to relax the leading edge of the sheet as soon as it is released by some or all of the grippers.
  • This guide member can consist of two or more rollers which act, for example, on the sheet transported by the respective cylinder.
  • the gripper bridge consists of two gripper groups that are controlled separately from each other, each of these gripper groups must be assigned a special control curve.
  • the two gripper groups are then preferably opened and closed once or twice in succession, that is to say alternately. This alternating opening and closing enables a very effective relaxation of the leading edge of the sheet.
  • the gripper 1 shown in FIG. 1 of a gripper bridge 2 of a pressure cylinder 3 is fastened on a gripper housing which is rotatably mounted on the gripper shaft 5.
  • a stop block 6 is fixedly attached to the gripper shaft 5 and connected to the gripper housing via a compression spring 7.
  • the compression spring 7 constantly presses the gripper 1 in the direction of the gripper bar 8.
  • a set screw 10 is screwed into a partition 9 of the stop block 6, the screw end 11 of which interacts with a stop surface 12 of the gripper housing when the gripper 1 is lifted off the gripper bar 8.
  • the distance 13 between the screw end 11 and the stop surface 12 is adjustable and determines the point in time at which the respective gripper 1 is lifted off the gripper bar 8.
  • the distance 13 can be carried out differently in the individual grippers 1, so for the purpose of relaxing the previously detected sheet leading edge with a corresponding one Design of the gripper shaft control curve 14, see FIG. 2, only lift off a few grippers 1, but not yet the others with a somewhat greater distance 13.
  • this configuration consists in a recess 15 of the gripper shaft control curve 14, while in the case of a not necessarily forcibly closing gripper system the gripper shaft control curve 14 has an elevation 16. This measure makes it possible, in a simple and inexpensive manner, to relax a sheet, for example taken from a printing cylinder 3.
  • the cam roller 17 of the gripper shaft 5 reaches the aforementioned small recess 15 or the elevation 16 of the gripper shaft control curve 14 and causes all those grippers 1 to be lifted off the gripper bar 8, which have a small distance 13, while the remaining grippers 1 with the larger distance 13 continue to hold the bow due to the compressive stress of the compression spring 7 in cooperation with the gripper bar 8.
  • the lifting and closing of the first group of grippers 1 must be completed before printing begins.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Claims (4)

1. Procédé pour l'obtention d'impressions en plusieurs couleurs au registre sur une rotative offset à feuilles, dans laquelle la traverse porte-pinces (2) d'un cylindre, équipée sur toute sa longueur d'une barre (8) d'impact de pinces rigide, transfère la feuille à la traverse porte-pinces (2) correspondante du cylindre suivant, ledit procédé étant caractérisé en ce qu'après la prise de feuille, mais avant le début de l'impression ou avant le transfert de feuille suivant, quelques unes des pinces (1) de la traverse (2) guidant la feuille, mais pas toutes, s'ouvre pendant un bref intervalle de temps, les contraintes produites par ondulation dans la zone du bord d'attaque de la feuille s'éliminant ou diminuant d'elles-mêmes, sans intervention de moyens additionnels.
2. Procédé selon revendication 1, caractérisé en ce que dans le cas d'une division de la traverse porte-pinces (2) en deux groupes de pinces à commande séparée, la commande s'effectue de façon que les groupes de pinces s'ouvrent et se ferment alternativement.
3. Procédé selon revendication 1, caractérisé par l'ouverture d'une pince (1) sur deux.
4. Procédé d'obtention d'impressions en plusieurs couleurs au registre sur une rotative offset à feuilles, dans laquelle la traverse porte-pinces (2) d'un cylindre, équipée sur toute sa longueur d'une barre (8) d'impact de pinces rigide, transfère la feuille à la traverse porte-pinces correspondante du cylindre suivant, ledit procédé étant caractérisé en ce qu'après la prise de feuille, mais avant le début de l'impression ou avant le transfert de feuille suivant, toutes les pinces (1) de la traverse (2) s'ouvrent brièvement puis se referment, les contraintes produites par ondulation dans la zone du bord d'attaque de la feuille s'éliminant ou diminuant d'elles-mêmes sans intervention de moyens additionnels; et la feuille est guidée pendant cet intervalle de temps par un élément de guidage interagissant avec le cylindre (3) de la traverse porte-pinces (2).
EP79100765A 1978-05-11 1979-03-14 Procédé pour obtenir une impression avec plusieurs couleurs avec recouvrement exact des couleurs Expired EP0005435B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2820619 1978-05-11
DE2820619A DE2820619C2 (de) 1978-05-11 1978-05-11 Verfahren zum Entspannen eines Bogens

Publications (2)

Publication Number Publication Date
EP0005435A1 EP0005435A1 (fr) 1979-11-28
EP0005435B1 true EP0005435B1 (fr) 1982-12-29

Family

ID=6039140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79100765A Expired EP0005435B1 (fr) 1978-05-11 1979-03-14 Procédé pour obtenir une impression avec plusieurs couleurs avec recouvrement exact des couleurs

Country Status (9)

Country Link
EP (1) EP0005435B1 (fr)
JP (1) JPS54148609A (fr)
AR (1) AR220385A1 (fr)
AT (1) AT376176B (fr)
AU (1) AU523177B2 (fr)
CA (1) CA1119459A (fr)
DE (1) DE2820619C2 (fr)
DK (1) DK143098C (fr)
ZA (1) ZA792155B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140763C2 (de) * 1991-12-11 1997-06-19 Kba Planeta Ag Einrichtung zur Bogenführung
DE19618029B4 (de) * 1996-05-04 2006-07-27 Heidelberger Druckmaschinen Ag Verfahren und Vorrichtung zur Beseitigung von rhytmischen Passerfehlern in Bogendruckmaschinen mit mehrfachgroßen Zylindern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1561072B1 (de) * 1967-03-25 1970-01-22 Heidelberger Druckmasch Ag Einrichtung an der UEbergabetrommel von Bogenrotationsdruckmaschinen zur Passerkorrektur
AT303766B (de) * 1969-03-10 1972-12-11 Heidelberger Druckmasch Ag Einrichtung an der Übergabetrommel von Bogenrotationsdruckmaschinen zur Passerkorrektur
DE2713994C2 (de) * 1977-03-30 1983-01-27 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Bogenhaltevorrichtung einer Bogen- Rotations-Druckmaschine, welche den Druckbogen geringfügig zu verformen vermag

Also Published As

Publication number Publication date
JPS54148609A (en) 1979-11-21
DE2820619C2 (de) 1986-03-27
AU523177B2 (en) 1982-07-15
AT376176B (de) 1984-10-25
DE2820619B1 (de) 1979-10-11
DK143098C (da) 1981-11-09
DK160979A (da) 1979-11-12
ZA792155B (en) 1980-06-25
ATA209379A (de) 1984-03-15
JPS5752232B2 (fr) 1982-11-06
DK143098B (da) 1981-03-30
AR220385A1 (es) 1980-10-31
EP0005435A1 (fr) 1979-11-28
CA1119459A (fr) 1982-03-09
AU4642079A (en) 1980-11-13

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