EP1342572B1 - Joint pour une chambre à racle - Google Patents

Joint pour une chambre à racle Download PDF

Info

Publication number
EP1342572B1
EP1342572B1 EP02002830A EP02002830A EP1342572B1 EP 1342572 B1 EP1342572 B1 EP 1342572B1 EP 02002830 A EP02002830 A EP 02002830A EP 02002830 A EP02002830 A EP 02002830A EP 1342572 B1 EP1342572 B1 EP 1342572B1
Authority
EP
European Patent Office
Prior art keywords
seal
lips
inking unit
unit according
doctor blade
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
EP02002830A
Other languages
German (de)
English (en)
Other versions
EP1342572A1 (fr
Inventor
Wilfried Dr. Kolbe
Klaus Schirrich
Lars Grüter
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.)
Fischer and Krecke GmbH and Co KG
Original Assignee
Fischer and Krecke GmbH and Co KG
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 Fischer and Krecke GmbH and Co KG filed Critical Fischer and Krecke GmbH and Co KG
Priority to DE50201888T priority Critical patent/DE50201888D1/de
Priority to EP02002830A priority patent/EP1342572B1/fr
Priority to DK02002830T priority patent/DK1342572T3/da
Priority to US10/359,368 priority patent/US6672207B2/en
Publication of EP1342572A1 publication Critical patent/EP1342572A1/fr
Application granted granted Critical
Publication of EP1342572B1 publication Critical patent/EP1342572B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/061—Inking devices
    • B41F9/065—Using inking rails

Definitions

  • the invention relates to an inking unit of a printing press with a seal for a chambered doctor blade in the form of a rubber-elastic body which is inserted at the end of the chambered doctor blade in a seal holder and rests on the circumference of a roller against which the chambered doctor blade is employed.
  • Such an inking unit is known from document US 4581995 A.
  • a chamber doctor blade is used, for example, in a flexographic printing machine for coloring an anilox roller, which in turn transmits the printing ink to the plates on the printing cylinder.
  • the chamber doctor blade forms a running in the longitudinal direction of the anilox chamber, which is filled with ink during the printing operation and on the anilox roller facing side is limited by two doctor blades, which are employed obliquely against the circumference of the anilox roller.
  • the seals which form the subject of the invention, have the purpose of sealing the chamber at both ends. The seal must consequently abut against the peripheral surface of the rotating screen roller and is therefore subject to considerable mechanical stress and wear.
  • a seal of the type mentioned which has on its circumference, so both on the side facing the anilox roller and on the side facing the seal holder, a circumferential, obliquely employed lip. Due to the inclination and the profile of the lip, the resilience of the lip can be dosed so that a suitable compromise between sealing properties, susceptibility to wear and tolerance compensation capability is achieved.
  • the object of the invention is to improve the sealing properties of such a seal.
  • the recorded in the seal holder part of the seal is formed as a solid block-shaped Sokkel, which rests on a front side with a smooth surface on the chambered doctor blade and is surrounded on the other three sides of circumferential tolerance compensation lips.
  • the tolerance compensation lips compensate for the clearance between the seal body and the seal holder.
  • the rotating screen roller has the tendency to take the seal by frictional forces in the direction of rotation, so that the seal is pressed firmly against the relevant wall of the doctor chamber.
  • the full-surface contact of the seal has the advantage that the supporting forces can be stably absorbed, so that the Dichturigseigenschaften are not affected by friction-related displacements and / or deformation of the seal.
  • the seal behaves softer, so that it can be easily inserted into the seal holder and still ensures a good seal on the inner surface of the seal holder on the entire circumference.
  • the seal at least on the front side on a perpendicular to the local tolerance compensation ribs extending rib which blocks the grooves formed between the tolerance compensation lips and thus prevents the ink flows around the seal in these grooves.
  • a corresponding rib can be formed by the dividing seam, which in any case arises during the manufacture of the gasket with the aid of a two-part molding tool. In this way, a reliable seal is ensured here as well.
  • the seal on two lips which together form a V-shaped cross section and on the peripheral surface of the Roll lie.
  • the two lips not only redundancy and thus improve the sealing properties is achieved, but by the V-shaped configuration, which causes the two lips are made obliquely in opposite directions, the sensitivity to changing mechanical stresses is significantly reduced ,
  • the seal is often exposed to an alternating pressure gradient between the interior of the chambered doctor blade and the environment.
  • a negative pressure frequently occurs in the chamber.
  • these alternating compressive stresses always have the effect that one of the lips is pivoted away from the anilox roller, so that their sealing effect is reduced, but the other lip is pressed against the anilox roller the more firmly. In this way, regardless of the direction of the pressure gradient, a high sealing effect is achieved. Due to the same effect, a greater insensitivity of the seal to changing stresses is achieved, which could be caused for example by an axial clearance of the anilox roller and / or by thermal expansion of the anilox roller.
  • the lips are formed not only in the voltage applied to the anilox part of the seal, but also in the parts which bear against the doctor blades.
  • a high compliance of the seal is achieved in particular at the points where the peripheral surface of the anilox roller, the sealing lip and one of the doctor blade collide, so that the sealing lip can also adapt well to any wear on the doctor blade.
  • the lines of contact of the two sealing lips run parallel to one another with the peripheral surface of the anilox roller, while the contact lines diverge outwardly in the region of the doctor blade.
  • the sealing lips are under slight pressure on the circumference of the anilox roller and the doctor blades and are thus easily bent apart. If it comes to a wear on the edge of the doctor blade, the obliquely divergent parts of the lines of contact of the sealing lips with the anilox roller in Reiberlickung, and the frictional forces ensure that the sealing lips in this area again erected something become.
  • a good contact of the sealing lip on the anilox roller and the doctor blade is achieved especially at the point where the peripheral surface of the rotating screen roller runs pointed on the doctor blade.
  • a good system of the sealing lip is particularly important because the ink is entrained by the rotating screen roller and presses against the blade of the doctor blade, so that at this point a good seal against the dynamic pressure of the ink is required.
  • the above-described course of the contact lines of the sealing lips on the anilox roller and on the doctor blades is preferably achieved by the fact that the seal in its part facing the anilox roller is tapered overall in the shape of a pyramid towards the anilox roller. This also has the advantage that the voltage applied to the anilox roller parts of the sealing lips can bend apart more or less depending on the pressing force without they abut against the walls of the seal holder.
  • the two sealing lips are preferably delimited by a V-shaped notch, which extends in the circumferential direction of the anilox roller through the seal. Since the surface areas of the gasket on which the two doctor blades rest obliquely from the circumference of the anilox roller, the notch in these areas is pointed, so that the cross section of the sealing lips here increases progressively towards the ends of the seal. In this way, the stiffness of the sealing lips is controlled so that the sealing lips in the anilox roll and at the transition points between the anilox roller and the doctor blades are relatively resilient, while they are stiffer in the areas supporting the doctor blade, so that a solid Attachment is achieved on the stationary doctor blades.
  • the sealing lips are preferably bounded by pockets which are formed in the flanks of the tapered part of the seal and also extend into the areas in which the seal rests against the doctor blades. Due to the geometry of these pockets, the stiffness of the sealing lips can be adjusted as needed.
  • FIG. 1 shows, in cross-section, a chamber doctor blade 10 which is set against the circumference of an anilox roller 12 rotating in the clockwise direction.
  • the chamber doctor blade 10 has a channel profile, by which a chamber 14 is delimited, which is closed on the side facing the anilox roller 12 by two doctor blades 16 arranged in the form of a roof and by the circumferential surface of the anilox roller 12.
  • the doctor blade 16 scraped each with a cutting edge on the circumference of the anilox roller 12 along.
  • the chamber 14 is closed at both ends by a seal holder 18 and a seal 20 inserted therein.
  • the seal holder 18 is fitted in a liquid-tight manner in the channel profile of the chamber 14 and in turn forms a transverse to this channel profile U-shaped groove into which the seal 20 is inserted, as can be seen more clearly in Figure 2.
  • the seal 20 is made of a rubber elastic material having a Shore hardness of 60 to 90, preferably with Shore 80, and forms a cuboidal base 22, which is fitted tightly in the limited by the seal holder 18 and the walls of the chamber 14 cavity.
  • the seal forms two lips 24 running in the circumferential direction of the anilox roller 12, which are formed symmetrically to one another and together form a V-shaped cross section. These lips 24 are sealingly against the peripheral surface of the anilox roller 12 and on the inner surfaces of the doctor blade 16.
  • the angle between the lips 24 and the top of the base 22 is about 50 °, so that the lips enclose with each other an angle of about 80 °.
  • the seal 20 is shown in detail in Figures 3 to 5.
  • the lips 24 have in the side view according to Figure 3 each have a concave central portion 26 which is adapted to the curvature of the anilox roller 12 and to which at each end a rectilinear support zone 28 for the doctor blade 16 in question adjoins.
  • the main ridge of each lip forms an obtuse apex 30 which ideally lies at the point where the blade of the doctor blade contacts the raster roller.
  • this point can not be precisely determined in practice, because the doctor blade wears in the course of printing operation.
  • the lips 24 are each bounded on the outside by a pocket 32, which follows the contour of the concave central portion 26, but also extends slightly below the support zones 28.
  • the two lips 24 are bounded on the inside by a V-shaped notch 34 which, following the curvature of the concave central part 26, passes through the center of the gasket and at the bottom there is a deeper and narrower groove 36. Due to the cross section of the notch 34 and the depth of the groove 36, the stiffness of the lips 24 can be adjusted.
  • each lip 24 on the inside of its main comb on a somewhat shorter trained auxiliary lip 38 is slightly bent apart. In this way come - at least after some wear of the main combs - and the auxiliary lips 38 with the peripheral surface of the anilox roller 12 into contact.
  • the main combs of the lips 24 in the support zones 28 merge into a slightly raised seam 40 which runs around the entire peripheral edge of the seal. With their main combs and the seam 40, the two lips 24 thus form a closed contact line, with which they lie close to the anilox roller and the two doctor blades.
  • the V-shaped notch 34 extends in the support zones 28 in the oblique, flat, trapezoidal surfaces of the seal and therefore decreases there in width, so that the cross section and thus the hardness of the lips 24 increases towards the ends accordingly.
  • sufficient hardness of the lips is achieved in the zones that support the doctor blade 16
  • a sufficient compliance, in particular at the apex 30 is achieved, so that the lips 24 there at the transition points between the circumference of the anilox roller and can adjust the doctor blades.
  • the base 22 of the seal forms on a front side, left in Figures 3 and 5, a smooth surface 42, with the seal stably and fully supported on the wall of the chamber 14 when the seal is exposed to the frictional forces of the rotating screen roller 12.
  • On the other three sides of the Sokkel 22 is surrounded by a plurality of circumferential tolerance compensation ribs 44 which are separated by grooves 46.
  • the tolerance compensation ribs 44 compensate for the dimensional tolerances between the seal 20 and the seal holder 18, so that the base 22 of the seal can be easily and yet pressed tightly into the seal holder 18.
  • the grooves 46 are interrupted by a rib 48. If ink has entered the grooves 46, the rib 48 prevents this ink from flowing in the grooves 46 from the inside of the chamber 14 to the outside of the seal.
  • a similar function has on the opposite end face 42 a flat rib 50, which flattened when it rests against the wall of the chamber 14 and thus increases the sealing effect, without the stable support of the seal is impaired on this wall.
  • the seal 20 is preferably a molded part produced by injection molding.
  • the rib 50 can then easily by a Division seam between the two mold halves of the mold are formed.
  • At the lower edge of the base 22 has a circumferential chamfer or groove 52, which allows a correct fit of the seal 20 in the seal holder 18, even if dried in the inner edges of the seal holder ink residues have accumulated.

Claims (10)

  1. Système d'encrage d'une machine à imprimer comportant une garniture d'étanchéité pour une racle de chambre (10) sous la forme d'un corps présentant l'élasticité du caoutchouc, qui est insérée à l'extrémité de la racle de chambre dans un support de garniture d'étanchéité (18) et s'applique sur le pourtour d'un cylindre (12) contre lequel est appliquée la racle à chambre, caractérisé en ce que la partie de la garniture d'étanchéité (20), reçue dans le support de garniture d'étanchéité (18), est réalisée comme socle (22) massif de forme parallélépipédique qui s'applique, par une face frontale avec une surface lisse (42), contre la racle de chambre (10) et est entouré sur les trois autres faces par des lèvres de compensation des tolérances (44) périphériques.
  2. Système d'encrage selon la revendication 1, caractérisé en ce que les rainures (46), formées entre les lèvres de compensation de tolérances (44), sont fermées, sur l'autre face frontale du socle (22), par une nervure (48) s'étendant perpendiculairement aux lèvres de compensation des tolérances (44).
  3. Système d'encrage selon la revendication 1 ou 2, caractérisé en ce que sur la surface lisse (42) est disposée au moins une nervure (50) plate qui s'étend sur toute la hauteur du socle (22).
  4. Système d'encrage selon l'une des revendications précédentes, caractérisé en ce que le socle (22) présente sur son bord inférieur un chanfrein ou gorge creuse (52).
  5. Système d'encrage selon l'une des revendications précédentes, caractérisé en ce qu'il s'applique par deux lèvres (24), disposées en V dans la section transversale, contre le pourtour du cylindre (12).
  6. Système d'encrage selon la revendication 5, caractérisé en ce que les extrémités opposées des deux lèvres (24) forment des zones d'appui (28) pour des lames de racle (16) qui s'appliquent contre le pourtour du cylindre (12), et en ce que la dureté des lèvres (24) dans les zones d'appui (28) diminue vers l'extrémité.
  7. Système d'encrage selon la revendication 6, caractérisé en ce que les arêtes principales des lèvres (24) dans les zones d'appui (28) se prolongent dans une bordure (40) entourant toute la garniture d'étanchéité, de sorte qu'il est formé une ligne de contact fermée entre la garniture d'étanchéité (20) d'une part et le cylindre (12) ainsi que les lames de racle (16) d'autre part.
  8. Système d'encrage selon la revendication 6 ou 7, caractérisé en ce que la distance entre les arêtes principales des lèvres (24) est plus petite au milieu qu'aux extrémités.
  9. Système d'encrage selon la revendication 8, caractérisé en ce que la partie de la garniture d'étanchéité, tournée vers le cylindre (12), est réalisée dans son ensemble en forme de pyramide et en ce que les deux lèvres (24) sont limitées sur le côté intérieur par une encoche (34) en V qui débouche dans les zones d'appui (28), dans les surfaces obliques de la pyramide.
  10. Système d'encrage selon l'une des revendications 6 à 9, caractérisé en ce que les lèvres (24) sont limitées chacune sur le côté extérieur par une poche (32) qui s'étend à chaque extrémité un peu à l'intérieur de la zone d'appui (28).
EP02002830A 2002-02-08 2002-02-08 Joint pour une chambre à racle Expired - Lifetime EP1342572B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE50201888T DE50201888D1 (de) 2002-02-08 2002-02-08 Dichtung für Kammerrakel
EP02002830A EP1342572B1 (fr) 2002-02-08 2002-02-08 Joint pour une chambre à racle
DK02002830T DK1342572T3 (da) 2002-02-08 2002-02-08 Tætning til en kammerrakel
US10/359,368 US6672207B2 (en) 2002-02-08 2003-02-06 Seal for chambered doctor blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02002830A EP1342572B1 (fr) 2002-02-08 2002-02-08 Joint pour une chambre à racle

Publications (2)

Publication Number Publication Date
EP1342572A1 EP1342572A1 (fr) 2003-09-10
EP1342572B1 true EP1342572B1 (fr) 2004-12-29

Family

ID=27635789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02002830A Expired - Lifetime EP1342572B1 (fr) 2002-02-08 2002-02-08 Joint pour une chambre à racle

Country Status (4)

Country Link
US (1) US6672207B2 (fr)
EP (1) EP1342572B1 (fr)
DE (1) DE50201888D1 (fr)
DK (1) DK1342572T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012102483U1 (de) 2012-07-05 2012-08-06 MÖLLERING Gummi- und Kunststofftechnik GmbH Kammerrakeldichtung mit Gleitstück

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JP4498148B2 (ja) * 2004-02-12 2010-07-07 キヤノン株式会社 液体塗布装置、記録装置
US20070261577A1 (en) * 2006-04-26 2007-11-15 Burrow William J Printing roll with dead band helical pattern
US7597761B2 (en) * 2006-08-10 2009-10-06 Van Denend Mark E Sealing assembly for an ink chamber which includes self-lubricating anilox roll seal with improved blade/seal area
DK176626B1 (da) * 2007-08-21 2008-12-01 Tresu Anlaeg As Pakning til kammerrakel
ES2335458B1 (es) * 2007-10-23 2011-03-22 Comexi, S.A. Dispositivo de estanqueidad lateral para un conjunto de camara y rasqueta de rodillo entintador.
US20090193990A1 (en) * 2008-02-06 2009-08-06 Van Denend Mark E Seal for an Ink Chamber with Improved Blade/Seal Area
WO2009099564A1 (fr) * 2008-02-06 2009-08-13 Van Denend Mark E Joint destiné à une chambre d’encrage et à zone de raclage/d’étanchéité améliorée
DK176856B1 (da) * 2008-11-26 2009-12-14 Tresu As Trykværk med böjet tætningsrakel
EP2360017A3 (fr) 2010-02-23 2012-07-18 The Provident Group, Inc. Lame améliorée d'encrier/confinement pour presse d'impression
US8474378B1 (en) 2010-02-23 2013-07-02 Valley Holdings, Llc Chamber blade/sealing assembly for a printing press
EP2425972B1 (fr) * 2010-09-01 2016-01-13 Anthony Foley Joint auto-lubrifiant pour chambre à racle
US9283744B2 (en) * 2011-08-11 2016-03-15 Tresu A/S Gasket for a doctor blade chamber
US9085131B1 (en) 2012-06-08 2015-07-21 Valley Holdings, Llc End seal for an ink chamber of a printing machine
DE202021102690U1 (de) 2021-05-18 2022-08-22 Möllering Gummi- und Kunststoff-Technik GmbH Dichtelement, Rakelkammer mit einem Dichtelement und Druckmaschine mit einem Dichtelement
CN116352947A (zh) * 2023-03-31 2023-06-30 青岛环球输送带有限公司 一种输送带生产用橡胶压延设备

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012102483U1 (de) 2012-07-05 2012-08-06 MÖLLERING Gummi- und Kunststofftechnik GmbH Kammerrakeldichtung mit Gleitstück

Also Published As

Publication number Publication date
US20030150342A1 (en) 2003-08-14
US6672207B2 (en) 2004-01-06
DK1342572T3 (da) 2005-02-07
DE50201888D1 (de) 2005-02-03
EP1342572A1 (fr) 2003-09-10

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