EP0673770B1 - Procédé et dispositif pour enlever des mouches de la plaque d'impression d'une machine à imprimer - Google Patents

Procédé et dispositif pour enlever des mouches de la plaque d'impression d'une machine à imprimer Download PDF

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Publication number
EP0673770B1
EP0673770B1 EP95103230A EP95103230A EP0673770B1 EP 0673770 B1 EP0673770 B1 EP 0673770B1 EP 95103230 A EP95103230 A EP 95103230A EP 95103230 A EP95103230 A EP 95103230A EP 0673770 B1 EP0673770 B1 EP 0673770B1
Authority
EP
European Patent Office
Prior art keywords
roller
damping
peripheral speed
rotational speed
feeding
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
EP95103230A
Other languages
German (de)
English (en)
Other versions
EP0673770A1 (fr
Inventor
Peter Hummel
Robert Ortner
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.)
Manroland AG
Original Assignee
MAN Roland 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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0673770A1 publication Critical patent/EP0673770A1/fr
Application granted granted Critical
Publication of EP0673770B1 publication Critical patent/EP0673770B1/fr
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
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/02—Cleaning arrangements or devices for forme cylinders

Definitions

  • the invention relates to a method and a device for removing slugs on the printing plate of a plate cylinder of a printing press, in which the peripheral speed of a dampening roller of a dampening unit, which normally corresponds to the peripheral speed of the printing plate, temporarily decreases and at the same time the rotating speed of a dampening agent supply roller, which is independently controllable for metering the fountain solution supply will be changed.
  • a so-called wiping or delta effect is achieved due to the lower peripheral speed of the dampening roller compared to the plate cylinder, through which slugs are removed from the printing plate.
  • the invention has for its object to provide a method of the type mentioned that does not affect the printing process and enables a consistent printing result.
  • this object is achieved in that the speed of rotation of the dampening roller is simultaneously changed while reducing the peripheral speed of the dampening roller such that the dampening solution supply to the dampening roller is reduced and that when the peripheral speed of the dampening roller is adjusted to the peripheral speed of the printing plate, the rotational speed of the dampening solution feeding roller is reset to the previous value.
  • the method according to the invention is based on the surprising finding that, despite the reduction in the peripheral speed of the dampening application roller with constant metering of the dampening solution supply, the quantity of dampening solution supplied to the printing plate increases and the printing result thereby deteriorates.
  • By reducing the dampening solution supply to the dampening roller this increased dampening solution transfer is compensated for in delta operation and a change in the ink-moisture balance when switching to delta operation is avoided.
  • the method according to the invention thus enables contamination on the printing plate to be removed while maintaining a constant printing result.
  • the required degree of reduction of the dampening solution supply with a reduced peripheral speed of the dampening roller depends on the respective setting of the printing press and can be determined empirically in a simple manner. Once the suitable setting has been found, the switchover can take place automatically without manual intervention by the printer. A device suitable for this is specified in claim 3.
  • the dampening solution supply can be changed in different ways depending on the design of the dampening unit.
  • a method is advantageous in which the dampening solution supply is reduced by lowering the speed of the separately driven immersion roller of the dampening unit, for example a three-roller dampening unit.
  • the drawing shows the roller diagram of a dampening unit of a rotary offset printing machine.
  • the dampening system shown consists of a three-roller system which comprises a dampening roller 3, an immersion roller 4 and a metering roller 5.
  • the dampening roller 3 is in contact with a plate cylinder 7 to transfer to this dampening solution. It is driven together with the plate cylinder 7 by the drive of the printing press.
  • Under the The dampening roller 3 is the immersion roller 4, which takes the dampening solution from a dampening solution tank 9 and transfers it to the dampening roller 3.
  • the dosing roller 5 abutting the dipping roller 4 ensures, in a known manner, a uniform distribution of the dampening solution on the surface of the dipping roller 4 and determines the thickness of the dampening solution film.
  • Both rollers, the dipping roller 4 and the metering roller 5, are driven by a common separate drive, for example an electric motor, the drive speed of which can be regulated.
  • dampening roller 3 there is a driven bridge roller 2 which bears against the dampening roller 3 and an inking roller 1 of an inking unit 10 which is only partially shown.
  • a tandem roller 6 can be provided which interacts with the bridge roller 2 and the dampening roller 3. With 8 the blanket cylinder transmitting the printed image is designated.
  • the plate cylinder 7 and the dampening roller 3 are driven at the same peripheral speed, the plate cylinder 7 rotating at the machine speed.
  • the speed and thus the peripheral speed of the dipping roller 4 and the metering roller 5 depends on the required dosage of the dampening solution supply.
  • the peripheral speed of the dipping roller 4 can deviate from the peripheral speed of the dampening roller 3.
  • the drive speed of the dampening roller 3 is reduced by approximately 5 to 10%, for example with the aid of a gearbox, while the plate cylinder 7 continues to rotate at machine speed. Due to the reduced peripheral speed of the dampening roller 3 in this way arises on the pressure plate of the plate cylinder 7 a wiping effect, whereby slugs on the printing plate are removed. It has now been found that, contrary to all expectations, the supply of dampening solution on the printing plate does not increase when switching to operation with a wiping effect without changing the setting of the dampening unit, so that the printed image fades and there is a risk of dampening solution getting into the inking unit.
  • the drive speed of the dipping roller 4 and the metering roller 5 is reduced to the extent that the ink-moisture balance remains unchanged simultaneously with the switching of the drive of the dampening roller 3 to a lower speed.
  • the system switches back to normal operation, ie the peripheral speed of the dampening roller 3 is adjusted to the peripheral speed of the plate cylinder 7 and the drive speeds of the dipping roller 4 and the metering roller 5 are switched back to the previously set value.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (3)

  1. Procédé pour éliminer des impuretés sur la plaque d'impression d'un cylindre porte-plaque d'une machine d'impression, dans lequel la vitesse périphérique, correspondant normalement à la vitesse périphérique de la plaque d'impression, d'un rouleau d'application d'un agent de mouillage d'une unité de mouillage est diminuée temporairement et, simultanément, la vitesse de rotation, réglable indépendamment pour le dosage de l'alimentation en fluide de mouillage, d'un rouleau amenant de l'agent de mouillage est modifiée,
    caractérisé en ce que la vitesse de rotation du rouleau (4) amenant de l'agent de mouillage est modifiée lors de la diminution de la vitesse périphérique du rouleau d'application (3) de l'agent de mouillage de sorte que l'amenée de l'agent de mouillage vers le rouleau d'application (3) de l'agent de mouillage est réduite, et en ce que, lorsque la vitesse périphérique du rouleau d'application (3) de l'agent de mouillage est de nouveau égale à la vitesse périphérique de la plaque d'impression (7), la vitesse de rotation du rouleau (4) amenant l'agent de mouillage est ramenée à la valeur précédente.
  2. Procédé selon la revendication 1,
    caractérisé en ce que la réduction de l'amenée de l'agent de mouillage est effectuée en diminuant la vitesse de rotation du rouleau plongeur (4), entraîné de façon séparée, de l'unité de mouillage.
  3. Dispositif pour amener de l'encre et un agent de mouillage au cylindre porte-plaque d'un machine d'impression rotative offset, comportant une unité d'encrage ayant au moins un rouleau d'application d'encre appliqué contre le cylindre porte-plaque, une unité de mouillage ayant au moins un rouleau d'application d'un agent de mouillage appliqué contre le cylindre porte-plaque, et un rouleau amenant cet agent de mouillage, dont la vitesse de rotation peut être réglée de façon indépendante pour le dosage de l'amenée de l'agent de mouillage, le rouleau d'application de l'agent de mouillage pouvant être entraîné, par commande de son entraînement, soit à la même vitesse périphérique que le cylindre porte-plaque, soit à une vitesse périphérique plus faible par rapport au cylindre porte-plaque,
    caractérisé en ce que la commande de la vitesse de rotation de rouleau (4) amenant l'agent de mouillage est reliée à l'entraînement du rouleau d'application (3) de l'agent de mouillage ou sa commande, de sorte que, en commandant l'entraînement du rouleau d'application (3) de l'agent de mouillage à une vitesse périphérique plus faible, la vitesse de rotation du rouleau (4) amenant l'agent de mouillage est simultanément diminuée à une valeur prédéfinie et, par commande inverse, est augmentée à nouveau à la valeur précédente.
EP95103230A 1994-03-24 1995-03-07 Procédé et dispositif pour enlever des mouches de la plaque d'impression d'une machine à imprimer Expired - Lifetime EP0673770B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4410161 1994-03-24
DE4410161A DE4410161C2 (de) 1994-03-24 1994-03-24 Verfahren und Vorrichtung zur Beseitigung von Butzen auf der Druckplatte einer Druckmaschine

Publications (2)

Publication Number Publication Date
EP0673770A1 EP0673770A1 (fr) 1995-09-27
EP0673770B1 true EP0673770B1 (fr) 1997-04-16

Family

ID=6513697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103230A Expired - Lifetime EP0673770B1 (fr) 1994-03-24 1995-03-07 Procédé et dispositif pour enlever des mouches de la plaque d'impression d'une machine à imprimer

Country Status (3)

Country Link
EP (1) EP0673770B1 (fr)
AT (1) ATE151696T1 (fr)
DE (2) DE4410161C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19645169C2 (de) * 1996-11-02 2000-02-03 Roland Man Druckmasch Verfahren zur Reinigung von Zylindern und Walzen in einer Druckmaschine
DE19902957C2 (de) * 1999-01-26 2003-05-28 Roland Man Druckmasch Dosiervorrichtung an einer Rotationsdruckmaschine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2007156A (en) * 1977-11-05 1979-05-16 Maschf Augsburg Nuernberg Ag Rotary Offset Printing Machine
JPS59212268A (ja) * 1983-05-11 1984-12-01 ボ−ルドウイン・テクノロジイ・コ−ポレイシヨン 平版印刷機における給湿装置及び方法
DD238574A1 (de) * 1985-06-25 1986-08-27 Polygraph Leipzig Verfahren und einrichtung zur beseitigung von putzen auf der druckplatte
US5158017A (en) * 1990-09-11 1992-10-27 Sun Graphic Technologies, Inc. Press dampening system

Also Published As

Publication number Publication date
DE4410161C2 (de) 1998-02-26
EP0673770A1 (fr) 1995-09-27
DE59500182D1 (de) 1997-05-22
ATE151696T1 (de) 1997-05-15
DE4410161A1 (de) 1995-10-05

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