EP0391245B1 - Support de raclette - Google Patents

Support de raclette Download PDF

Info

Publication number
EP0391245B1
EP0391245B1 EP90105973A EP90105973A EP0391245B1 EP 0391245 B1 EP0391245 B1 EP 0391245B1 EP 90105973 A EP90105973 A EP 90105973A EP 90105973 A EP90105973 A EP 90105973A EP 0391245 B1 EP0391245 B1 EP 0391245B1
Authority
EP
European Patent Office
Prior art keywords
doctor blade
printing unit
cylinder
unit cylinder
blade holder
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
EP90105973A
Other languages
German (de)
English (en)
Other versions
EP0391245A2 (fr
EP0391245A3 (fr
Inventor
Ingo Köbler
Thomas John
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 EP0391245A2 publication Critical patent/EP0391245A2/fr
Publication of EP0391245A3 publication Critical patent/EP0391245A3/fr
Application granted granted Critical
Publication of EP0391245B1 publication Critical patent/EP0391245B1/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
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/08—Wiping mechanisms
    • B41F9/10—Doctors, scrapers, or like devices
    • B41F9/1072—Blade construction

Definitions

  • the invention relates to a doctor blade holder for a doctor blade, which cooperates with a printing unit cylinder having a gap and can be adjusted at an angle to the cylinder axis.
  • doctor blade which is held in a doctor holder provided with the usual flat support surfaces, at an angle to the cylinder, the doctor blade will corrugate if you try to position it over the entire length against the printing unit cylinder.
  • the tendency to wave is greater, the more inclined the doctor blade is turned. Due to the waves, the pressure is not the same over the entire length of the squeegee. If you try to set the doctor blade so high that the required minimum pressure is present everywhere, some parts of the doctor blade are set more strongly. As a result, increased wear occurs here.
  • the invention has for its object to provide a doctor blade holder with which the doctor blade can be applied to a printing unit cylinder over the entire length with uniform pressure.
  • Fig. 3 shows the basic arrangement with a printing unit cylinder 1, the longitudinal axis of which is designated AA.
  • the printing unit cylinder 1 has a gap 2 with the width b, which is used to fasten an elevator (not shown in more detail), for example a gravure winding plate.
  • a doctor blade 3 can be placed on the printing unit cylinder and is held in a doctor holder consisting of an upper part 4 and a lower part 5.
  • the parts 4, 5 clamp the doctor blade 3 between them in a known manner, not shown. In the simplest form, they are connected to one another by means of screws.
  • the doctor blade 3 should be arranged inclined by an inclination angle ⁇ with respect to the longitudinal axis AA.
  • This angle is to be chosen so that when passing through the gap 2 under the doctor blade 3, at least a portion of the Knife rests on the circumference of the printing unit cylinder 1, so that the doctor blade 3 cannot fall into the gap 2.
  • the angle of inclination ⁇ should generally be selected between 0.1 ° and 1 °.
  • the exact shape of the contact surfaces of the upper and lower parts 4, 5 of the doctor blade holder can be determined by means of the following auxiliary structures described with reference to FIGS. 1 and 2.
  • the inclination angle ⁇ is chosen to be exaggerated for reasons of better visibility.
  • An initial plane (drawing plane in FIG. 1) is laid through the longitudinal axis A-A of the printing group cylinder 1 with a radius r and a length 1. Vertically on this starting level, a plane E 1 is built which intersects the longitudinal axis A-A at the desired inclination angle ⁇ .
  • the plane E1 intersects the longitudinal axis A-A at point P 1 and the extension of an axially parallel surface line lying in the output plane of the printing unit cylinder 1 at point P 2. This plane further cuts the printing unit cylinder 1 between points Q1 and Q2.
  • the points P1 and P2 are outside the printing unit cylinder 1. Their distance clearly exceeds the length of the printing unit cylinder 1.
  • an elliptical cylinder with a longitudinal axis BB can be erected perpendicular to the plane E 1.
  • the choice of the inclination angle ⁇ and the resulting shape and position of the elliptical cylinder result for each point of the cutting line Q1-Q2 an intersection angle ⁇ between ⁇ the surfaces of the printing unit cylinder 1 and the elliptical cylinder.
  • the tangent t1 to the circle G 'at point A' and the tangent t2 to the ellipse H 'at point A' include the cutting angle ⁇ , the angle of attack of the elliptical cylinder to the printing unit cylinder at point Q.
  • the cutting angle ⁇ varies for a selected one elliptical cylinder Z within narrow limits, due to the small inclination angle ⁇ depending on the position of the point Q on the section line Q1-Q2.
  • the size of the average cutting angle ⁇ is determined by the choice of the inclination angle ⁇ and the position of the point P 1 on the axis A-A of the printing unit cylinder 1.
  • the subsequent surface of the elliptical cylinder defines a curved surface that can be developed in one plane.
  • This partial surface D is checked in Fig. 2. If knife support surfaces 6, 7 are formed on the upper and lower parts 4, 5 of the doctor blade holder in accordance with the course of this surface, a flat, flexible surface can be provided between these knife support surfaces Clamp doctor blade 3, the front edge 8 of which lies along the stretch Q1 ⁇ -Q2 ⁇ evenly on the printing unit cylinder 1, as shown in FIGS. 2 to 6.
  • the cutting angle ⁇ is at the same time the angle of attack of the doctor blade 3 on the printing unit cylinder 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)

Claims (2)

  1. Support de raclette pour un couteau (3) de raclette qui coopère avec un cylindre d'impression (1) présentant une fente (2) et qui est réglable en oblique par rapport à l'axe A-A du cylindre d'impression, caractérise en ce que les surfaces (6, 7) de la partie supérieure et de la partie inférieure (4, 5) du support de raclette qui fixent entre elles le couteau (3) de raclette sont réalisées sous forme de surfaces d'enveloppes partielles d'un cylindre elliptique qui est basé sur une ellipse (Z) et en ce que la surface de base elliptique du cylindre elliptique est constituée par la surface d'intersection du cylindre d'impression cylindrique (1) avec un plan (E1) qui coupe le cylindre d'impression en formant un angle d'inclinaison (α) avec l'axe longitudinal (A-A) du cylindre d'impression et en ce que le demi petit axe de l'ellipse (Z) est égal au rayon (r) du cylindre d'impression tandis que le petit grand axe dépasse la longueur (1) du cylindre d'impression (1).
  2. Support de raclette selon la revendication 1 caractérisé en ce que l'angle d'inclinaison (α) est compris entre 0,1° et 1°.
EP90105973A 1989-04-01 1990-03-29 Support de raclette Expired - Lifetime EP0391245B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3910497A DE3910497C1 (fr) 1989-04-01 1989-04-01
DE3910497 1989-04-01

Publications (3)

Publication Number Publication Date
EP0391245A2 EP0391245A2 (fr) 1990-10-10
EP0391245A3 EP0391245A3 (fr) 1991-04-24
EP0391245B1 true EP0391245B1 (fr) 1994-01-05

Family

ID=6377565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90105973A Expired - Lifetime EP0391245B1 (fr) 1989-04-01 1990-03-29 Support de raclette

Country Status (5)

Country Link
US (1) US5101725A (fr)
EP (1) EP0391245B1 (fr)
JP (1) JP2837222B2 (fr)
CA (1) CA2013255C (fr)
DE (2) DE3910497C1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5517918A (en) * 1994-07-29 1996-05-21 Fischer & Krecke Gmbh & Co. Doctor blade clamping assembly for a printing press
CA2374786A1 (fr) 1999-05-25 2000-11-30 John Moscone Extracteur de racle

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1461068A (en) * 1922-07-29 1923-07-10 Regensteiner Theodore Printing roller
US1773949A (en) * 1928-08-10 1930-08-26 Oxford Varnish Corp Photogravure roll
GB879560A (en) * 1960-02-02 1961-10-11 Dominion Eng Works Ltd Improvements in doctors or scrapers for cylinders or drums
US2974586A (en) * 1960-04-19 1961-03-14 Hunt Forest Wethero Doctor blade and doctor blade shear for textile printing machine
GB1033986A (en) * 1963-10-28 1966-06-22 Argon Service Ltd Screen printing machines
NL7500344A (nl) * 1975-01-10 1976-07-13 Stork Brabant Bv Inrichting voor het aanbrengen van een laag van een viskeuze stof op een voortbewegende band.
US4047480A (en) * 1976-07-30 1977-09-13 E. I. Du Pont De Nemours And Company Longitudinally flexible squeegee and mounting strips therefor
DK153816C (da) * 1986-10-21 1989-02-13 Colgate Palmolive Co Emballagebeholder samt fremgangsmaade til paafoering af paatryk paa en flade af en saadan beholder

Also Published As

Publication number Publication date
CA2013255C (fr) 1993-04-13
DE3910497C1 (fr) 1990-09-13
EP0391245A2 (fr) 1990-10-10
JPH02281943A (ja) 1990-11-19
CA2013255A1 (fr) 1990-10-01
DE59004077D1 (de) 1994-02-17
EP0391245A3 (fr) 1991-04-24
US5101725A (en) 1992-04-07
JP2837222B2 (ja) 1998-12-14

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