EP0287822B1 - Einrichtung zum Entfernen von Schmutzteilchen vom Plattenzylinder einer Offsetdruckmaschine - Google Patents

Einrichtung zum Entfernen von Schmutzteilchen vom Plattenzylinder einer Offsetdruckmaschine Download PDF

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Publication number
EP0287822B1
EP0287822B1 EP88104524A EP88104524A EP0287822B1 EP 0287822 B1 EP0287822 B1 EP 0287822B1 EP 88104524 A EP88104524 A EP 88104524A EP 88104524 A EP88104524 A EP 88104524A EP 0287822 B1 EP0287822 B1 EP 0287822B1
Authority
EP
European Patent Office
Prior art keywords
base part
plate cylinder
pneumatic cylinders
offset
strippers
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
EP88104524A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0287822A1 (de
Inventor
Werner Grossmann
Hans-Georg Herzing
Manfred Dipl.-Ing. Piltz
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
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0287822A1 publication Critical patent/EP0287822A1/de
Application granted granted Critical
Publication of EP0287822B1 publication Critical patent/EP0287822B1/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 plate cylinder of an offset printing machine, which extends over the entire length of the plate cylinder and acts on it in the area between the ink transfer to the blanket cylinder and the dampening application, wherein a drive is provided which consists of two pneumatic cylinders acting on the two ends of an elastic wiper.
  • the plate cylinder In offset printing, the plate cylinder is always contaminated. These contaminants can be paper or cardboard fibers of the material to be printed, agglomerations or lumps originating from the printing ink, or air dust; they leave unprinted or color-free areas on the surface to be printed.
  • the printing machine is stopped and the dirt particles are removed by hand, or a tool is pressed against the rotating plate cylinder while the printing machine is running, which removes the dirt particles. While stopping the printing machine leads to a decrease in the printing capacity and an increase in the reject percentage, since rejects are inevitable each time the printing machine is started, reaching into the running printing machine, which is forbidden in itself, is very dangerous for the operator and also causes, since it an undesirable partial removal of color is only possible from the color application side.
  • the invention has for its object to provide a cleaning device that allows a safe, quick and complete cleaning of the plate cylinder for the operator with minimal scrap and minimal wear and tear while the offset printing machine is running.
  • the wipers form a closed front which covers the entire length of the plate cylinder and which can be brought against the surface thereof in sections when the offset printing machine is running.
  • the scraper sweeping over this section; however, if there are several dirt particles distributed along the length of the plate cylinder, these can be removed in one go by simultaneously extending several wipers.
  • the vertically offset and laterally overlapping arrangement of the stripper side areas prevents the formation of a dead zone between adjacent strippers, the vertical spacing of the mutually facing surfaces counteracting the strippers sticking together.
  • the dimensioning of the stroke distance means that the extended scraper is always firmly pressed against the plate cylinder safe, the elasticity of the wiper material in conjunction with the compliance of the pneumatic drive ensures that there is no damage the surface of the plate cylinder comes; this dimensioning of the stroke also compensates for any scraper wear that may occur.
  • the space requirement of the device is so small that it can be accommodated on the dampening unit side without difficulty.
  • the pneumatic cylinders - individually or several at the same time - can be controlled without delay from the control panel of the offset printing press and are held on a bar which extends over the entire length of the plate cylinder and runs parallel to the cylinder axis, with their piston rods all having the same stroke length .
  • the cleaning device is thus actuated from the same point from which the ink zone screws are remotely controlled in order to adjust the ink layer thickness.
  • the wipers consist of a rear base part and a front pressure lip, both of which have approximately a cuboid shape, the base part being substantially thicker and wider than the pressure lip which projects over both sides of the base part; the base part should have about three times the thickness and width of the pressure lip.
  • the insertion opening for the piston rod is made centrally in the base part from the rear side thereof.
  • the comparatively weak dimensioning of the pressure lip, its lateral protrusion compared to the base part on each side is preferably about 5 mm, the elastic deformation in the course of pressing the scraper on the plate cylinder facilitates.
  • the length of each base part is equal to the width of the corresponding color zone appearing on the control panel of the offset printing press.
  • Fig. 1 shows five pneumatic cylinders 1a - 1e, which a rectangular in cross-section and longitudinal section 2a - 2e with the dimensions 48 ⁇ 12 ⁇ 5 mm and have a piston rod 3, of which only the piston rods 3a and 3c are visible.
  • the piston rods 3 are fork-shaped; at their free end, the two fork arms are bridged by a web 4. Compressed air supplies are indicated with 5a - 5e.
  • the pneumatic cylinders 1a - 1e are screwed onto a continuous bar 6.
  • the cylinders 1a-1e are provided with a rear tab 7a -7e with bores 8a-8e and a front housing bore 9a-9e; the fastening screw inserted into the housing bore 9a - 9e runs between the two fork arms of the piston rod 3.
  • Scraper 10a - 10e made of elastic material are pushed onto the free end of the piston rods 3 and consist of a rear base part 11a - 11e and a front pressure lip 12a - 12e.
  • the base part 11a-11e is much thicker and wider than the pressure lip 12a-12e and has an insertion opening 13 for the piston rod 3.
  • the base part 11a - 11e arcuate into the pressure lip 12a - 12e, each of which has lateral protrusions 12a1, 12a2, ..., 12e2.
  • the strippers 10a - 10e are arranged with respect to one another in such a way that, in the first, third and fifth strippers 10a, 10c, 10e, the pressure lip 12a, 12c, 12e below, in the second and fourth strippers 10b, 10d, however, the pressure lip 12b, 12d is arranged above, so that the adjacent lateral projections (eg 12a2 and 12b1) overlap each other.
  • the scraper 10c is shown in a position slightly further extended than the scraper 10a.
  • the scraper 10c cannot normally assume this position; it is only intended to illustrate the maximum stroke length, which is approximately 10 mm given the dimensions of the pneumatic cylinders 1a-1e given above. Since the maximum stroke length is somewhat greater than the distance between the front edge of the wipers 10a - 10e and the parallel surface of the plate cylinder 14, when the pneumatic cylinders 1a - 1e are acted upon, the wipers 10a 10e are always firmly and elastically pressed against the surface of the plate cylinder 14 and a compensation of any wear of the pressure lips 12a 12e guaranteed.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP88104524A 1987-04-22 1988-03-22 Einrichtung zum Entfernen von Schmutzteilchen vom Plattenzylinder einer Offsetdruckmaschine Expired - Lifetime EP0287822B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3713433 1987-04-22
DE19873713433 DE3713433A1 (de) 1987-04-22 1987-04-22 Einrichtung zum entfernen von schmutzteilchen vom plattenzylinder einer offsetdruckmaschine

Publications (2)

Publication Number Publication Date
EP0287822A1 EP0287822A1 (de) 1988-10-26
EP0287822B1 true EP0287822B1 (de) 1991-10-16

Family

ID=6326038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104524A Expired - Lifetime EP0287822B1 (de) 1987-04-22 1988-03-22 Einrichtung zum Entfernen von Schmutzteilchen vom Plattenzylinder einer Offsetdruckmaschine

Country Status (4)

Country Link
US (1) US4922820A (enrdf_load_stackoverflow)
EP (1) EP0287822B1 (enrdf_load_stackoverflow)
CA (1) CA1299015C (enrdf_load_stackoverflow)
DE (1) DE3713433A1 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824236C1 (enrdf_load_stackoverflow) * 1988-07-16 1989-12-28 Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De
DE3933677A1 (de) * 1989-10-09 1991-04-18 Miller Johannisberg Druckmasch Farbwerk einer druckmaschine mit einem verstellbaren schaber zum entfernen von am plattenzylinder anhaftenden schmutzteilchen
US5138945A (en) * 1991-08-13 1992-08-18 Man Roland Druckmaschinen Ag System for removing foreign matter from a plate cylinder of a printing press
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
DE4408533A1 (de) 1994-03-14 1995-09-28 Hoechst Ag PNA-Synthese unter Verwendung einer basenlabilen Amino-Schutzgruppe
US5603263A (en) * 1995-09-08 1997-02-18 Heidelberger Druckmaschinen Ag Scraper blade and ink scavenger for printing presses
AU6567498A (en) * 1997-03-18 1998-10-12 Machine Design Services, Inc. Cleaning system for blanket cylinders
US6691617B2 (en) * 2001-03-27 2004-02-17 Heidelberger Druckmaschinen Ag Apparatus for selectively cleaning a printing press cylinder
CH700101A1 (de) * 2008-12-12 2010-06-15 Alfred Simonetti Messschaber zum Messen eines Schaber-Anpressdrucks.
US8746142B2 (en) * 2012-06-27 2014-06-10 Illinois Tool Works Inc. Stencil wiper spot cleaner assembly and related method

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2359770A (en) * 1942-05-27 1944-10-10 Crowell Collier Publishing Com Apparatus for removing excess fluid from the printing cylinders of printing presses
US3822642A (en) * 1971-08-02 1974-07-09 G Grindeland Apparatus for removing foreign particles from a lithographic press
US4058058A (en) * 1976-02-26 1977-11-15 George Hantscho Company, Inc. Ink fountain for printing presses
FR2347195A1 (fr) * 1976-04-07 1977-11-04 Hitachi Printing Co Dispositif de depoussierage automatique d'un cylindre d'impression d'une imprimeuse
DE2850448A1 (de) * 1978-11-21 1980-05-29 Salvat Editores Vorrichtung zum beseitigen von fremdkoerpern von den platten von offset-druckmaschinen
US4311094A (en) * 1979-03-12 1982-01-19 Ellison Lloyd W Method and apparatus for removing foreign matter from a printing press plate cylinder
DE3101300C2 (de) * 1980-12-01 1983-03-17 Windmöller & Hölscher, 4540 Lengerich Rakelvorrichtung
DE3127381A1 (de) * 1981-07-10 1983-01-27 Salvat Editores, S.A., Barcelona Messorgane fuer im geschlossenen kreis arbeitende systeme zur ueberwachung und korrektur des drucks bei offset-druckmaschinen
DD209777A1 (de) * 1982-09-21 1984-05-23 Arndt Jentzsch Farbdosiereinrichtung
US4499827A (en) * 1983-03-22 1985-02-19 Dai Nippon Insatsu Kabushiki Kaisha System for automatically removing dust from plate cylinders of printing press
DD238574A1 (de) * 1985-06-25 1986-08-27 Polygraph Leipzig Verfahren und einrichtung zur beseitigung von putzen auf der druckplatte
US4782756A (en) * 1986-04-28 1988-11-08 Howard Paul C Printing press roller ink remover

Also Published As

Publication number Publication date
DE3713433C2 (enrdf_load_stackoverflow) 1992-01-09
EP0287822A1 (de) 1988-10-26
DE3713433A1 (de) 1988-11-03
CA1299015C (en) 1992-04-21
US4922820A (en) 1990-05-08

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