EP0422593B1 - Vorrichtung zum Entfernen von Schmutzteilchen vom Umfang eines Plattenzylinders einer Druckmaschine - Google Patents

Vorrichtung zum Entfernen von Schmutzteilchen vom Umfang eines Plattenzylinders einer Druckmaschine Download PDF

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Publication number
EP0422593B1
EP0422593B1 EP90119358A EP90119358A EP0422593B1 EP 0422593 B1 EP0422593 B1 EP 0422593B1 EP 90119358 A EP90119358 A EP 90119358A EP 90119358 A EP90119358 A EP 90119358A EP 0422593 B1 EP0422593 B1 EP 0422593B1
Authority
EP
European Patent Office
Prior art keywords
scraper
plate cylinder
periphery
control unit
printing machine
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
EP90119358A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0422593A1 (de
Inventor
Claus Simeth
Karl-Heinz Sellmann
Reinhold Hanske
Dieter Dipl.-Ing. Bachmann
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 EP0422593A1 publication Critical patent/EP0422593A1/de
Application granted granted Critical
Publication of EP0422593B1 publication Critical patent/EP0422593B1/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
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/02—Cleaning arrangements or devices for forme cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/40—Cleaning restricted areas on cylinders

Definitions

  • the invention relates to a device for removing dirt particles from the periphery of a plate cylinder of a printing press, on the periphery of which can be brought into contact with a scraper motor-adjustable in the axial direction of the plate cylinder to remove dirt particles adhering to it, further with a control that presets the motor Scraper in the axial direction of the plate cylinder causes.
  • Dirt particles adhering to the plate cylinder of an inking unit of a printing press are problematic because they result in corresponding imperfections in the printed image.
  • the dirt particles must therefore be removed from the plate cylinder as soon as the printer detects the presence of such dirt particles in the print image.
  • FR-A-2,347,195 proposes to leave the scraper at the location of the previous removal of the dirt particles.
  • the patent claim is based on this prior art.
  • the invention is therefore based on the object of developing a device which is distinguished by a noticeably reduced time which elapses between the discovery of such a dirt particle and its removal by the scraper.
  • Feature a will be used if the print image in question has areas of different color density for the color concerned, viewed side by side in the running direction of the machine. It is known from experience that with such printed images in the areas of greater color density there is a greater probability of the dirt particles occurring and this information known to the color scanner is therefore used for the device according to the invention for presetting the scraper.
  • the solution of the invention task according to feature b) is based on the knowledge that if there is essentially the same color distribution across the sheet width in the inking unit in question, then the occurrence of the dirt particles across the sheet width (in the axial direction of the plate cylinder) at every point is about equally likely. Due to the setting provided here in the central area of the plate cylinder and thus of the printed image, the distances are noticeably minimized compared to the prior art, where this parking position was provided on the edge of the printed image.
  • the feature c) makes use of the knowledge that - provided the same print image is present - the dirt particles generally appear in the same axial position in large numbers and the control algorithm is used to inform the controller of this position in which So the dirt particles appear frequently and the scraper is preset to this position. This also results in a noticeable shortening of the distances and thus the times required for the presetting.
  • This presetting according to feature c) via the learning algorithm thus makes use of presets from the past that were either started manually or via feature a) and / or feature b).
  • FIG. 1 a section of an inking unit of a printing press is shown schematically.
  • a rubber cylinder 1 abuts a plate cylinder 2.
  • the cylinders rotate in the direction of the arrows 3.
  • the rollers 4 of a dampening unit and inking rollers rest on the plate cylinder.
  • a scraper 5 lies on the circumference of the plate cylinder 2.
  • the scraper can be moved along the plate cylinder via a servomotor 6 in the direction of arrow 7.
  • the scraper sits on a rod or spindle 8 which is held on frame parts 9.
  • the axial position of the scraper 5 in the direction of the double arrow 7 is preset according to the features according to the invention, as explained at the beginning.
  • the printer detects the presence of a dirt particle on the printed image, he then only needs to adjust the scraper finely to the relevant position and he can then bring the tip of the scraper into contact with the plate cylinder 2 by means of a suitable mechanism, so that the dirt particle then removed there.
  • the scraper then moves back into its starting position given to it by the control system according to the invention.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP90119358A 1989-10-09 1990-10-09 Vorrichtung zum Entfernen von Schmutzteilchen vom Umfang eines Plattenzylinders einer Druckmaschine Expired - Lifetime EP0422593B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3933677 1989-10-09
DE3933677A DE3933677A1 (de) 1989-10-09 1989-10-09 Farbwerk einer druckmaschine mit einem verstellbaren schaber zum entfernen von am plattenzylinder anhaftenden schmutzteilchen

Publications (2)

Publication Number Publication Date
EP0422593A1 EP0422593A1 (de) 1991-04-17
EP0422593B1 true EP0422593B1 (de) 1995-07-19

Family

ID=6391110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90119358A Expired - Lifetime EP0422593B1 (de) 1989-10-09 1990-10-09 Vorrichtung zum Entfernen von Schmutzteilchen vom Umfang eines Plattenzylinders einer Druckmaschine

Country Status (5)

Country Link
EP (1) EP0422593B1 (enrdf_load_stackoverflow)
JP (1) JPH07119113B2 (enrdf_load_stackoverflow)
AT (1) ATE125204T1 (enrdf_load_stackoverflow)
DE (3) DE3943578C2 (enrdf_load_stackoverflow)
WO (1) WO1991004860A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2540682B2 (ja) * 1991-12-03 1996-10-09 株式会社コムテック オフセット印刷機における汚れ除去装置
GB2416134A (en) * 2004-07-13 2006-01-18 Innovation Holdings Apparatus and method for manufacturing concrete

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082038A (en) * 1976-04-07 1978-04-04 Hitachi Printing Co. Ltd. Apparatus for automatically removing dust from a form cylinder of a printing machine
FR2441490A1 (fr) * 1978-11-16 1980-06-13 Salvat Editores Perfectionnements apportes aux moyens d'extraction d'elements etrangers aux plaques d'impression en offset
US4499827A (en) * 1983-03-22 1985-02-19 Dai Nippon Insatsu Kabushiki Kaisha System for automatically removing dust from plate cylinders of printing press
DE3713433A1 (de) * 1987-04-22 1988-11-03 Werner Grossmann Einrichtung zum entfernen von schmutzteilchen vom plattenzylinder einer offsetdruckmaschine

Also Published As

Publication number Publication date
ATE125204T1 (de) 1995-08-15
DE3933677A1 (de) 1991-04-18
JPH07119113B2 (ja) 1995-12-20
DE3943578A1 (de) 1991-07-18
WO1991004860A1 (de) 1991-04-18
DE3933677C2 (enrdf_load_stackoverflow) 1991-09-05
EP0422593A1 (de) 1991-04-17
JPH04500051A (ja) 1992-01-09
DE3943578C2 (de) 1994-09-15
DE59009413D1 (de) 1995-08-24

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