EP0551797B1 - Lame doseuse - Google Patents

Lame doseuse Download PDF

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Publication number
EP0551797B1
EP0551797B1 EP92811018A EP92811018A EP0551797B1 EP 0551797 B1 EP0551797 B1 EP 0551797B1 EP 92811018 A EP92811018 A EP 92811018A EP 92811018 A EP92811018 A EP 92811018A EP 0551797 B1 EP0551797 B1 EP 0551797B1
Authority
EP
European Patent Office
Prior art keywords
metering
cylindrically shaped
shaped end
metering strip
strip according
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
EP92811018A
Other languages
German (de)
English (en)
Other versions
EP0551797A1 (fr
Inventor
Herbert Dipl.-Ing. Janser
Eugen Zwahlen
Peter Gertsch
Robert Imhof
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.)
Wifag Maschinenfabrik AG
Original Assignee
Wifag Maschinenfabrik 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 Wifag Maschinenfabrik AG filed Critical Wifag Maschinenfabrik AG
Publication of EP0551797A1 publication Critical patent/EP0551797A1/fr
Application granted granted Critical
Publication of EP0551797B1 publication Critical patent/EP0551797B1/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
    • B41F31/00—Inking arrangements or devices
    • B41F31/20—Ink-removing or collecting devices
    • 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 present invention relates to a metering bar for an inking unit of a printing press according to the preamble of claim 1.
  • a paper web to be printed is passed between two rotating cylinders of the printing press inking unit and printed on it. At least one of these two cylinders is designed as a blanket cylinder, to which the printing ink is transferred via further upstream rotating cylinders or rollers of the inking unit.
  • the printing ink which can be highly viscous, is applied to the first of these rollers and - if necessary via further rollers - is transported to the blanket cylinder mentioned.
  • the inking roller can be partially immersed in an ink bath in order to entrain ink when rotating, or a suitable inking device can be arranged over the entire width of the inking roller.
  • the ink film formed in this way on the inking roller must then be adjusted to the desired thickness by an appropriate metering device. This is usually done by means of a so-called doctor blade or a squeegee, which extends along the entire length of the ink application roller used for ink transfer and is pressed against the roller.
  • a metering device for the inking unit of a printing press for stripping a pre-metered ink film on an inking roller to the size required for the subsequent transfer to a forme cylinder is known from DE-C 37 14 936.
  • This metering device has at least one metering bar which extends along the inking roller and is pressed against this roller.
  • the metering bar is essentially radial to the inking roller, so that a metering gap is formed between the roller and the end of the metering bar facing the roller.
  • the end of the metering bar facing the roller is cylindrical in shape.
  • the metering bar can be pivoted about the axis of the cylinder, which is defined by the cylindrically shaped end is.
  • the metering bar In order to enable the metering bar to pivot about this axis within a limited angular range, the metering bar is mounted in a holder on its end faces via bearing pins, the axis of rotation of which coincides with the axis of the cylinder defined by the rounded end.
  • the embodiments of metering strips disclosed by this document and the metering devices including such metering strips, including the aforementioned holder for the metering strip, are assumed to be known.
  • a disadvantage of the metering strip known from DE-C 37 14 936 has been found to be that only a relatively small pivoting angle of less than 30 °, i.e. ⁇ 15 ° around the central axis is permitted, otherwise the width of the metering gap between the roller and the metering bar would increase inadmissibly if the metering bar were to be pivoted further. This would result in an undesirable change in the layer thickness of the paint applied to the roller.
  • the more viscous the printing ink used the more advantageous it is to pivot away by a larger angle than the aforementioned 30 °. If the metering bar is only pivoted slightly, there is a jam in the edge area between the roller and the metering bar, especially when using highly viscous printing ink, of the ink stripped from the metering bar and running freely.
  • DE-C 37 14 936 further proposes that dosing ends be spanned with a flexible, sheet-like plate which is fastened in such a way that it can be replaced easily and simply.
  • the wear resistance is thus paid for by a higher design effort which, in addition to the film-like, wear-resistant plate, requires additional locking devices for this plate.
  • the invention has therefore set itself the task of a metering bar for an inking unit of a printing machine while avoiding the create disadvantages known from the prior art; in particular, this metering bar with a simple structure, defining an exact metering gap, is intended to ensure the free flow of the stripped, superfluous paint applied to the paint application roller, especially when using highly viscous paint.
  • the advantage of the present invention is based on the fact that the cylindrically shaped end of a metering bar facing an inking roller covers an angular range of more than 180 ° and adjoins the cylindrically shaped end on both sides of the metering bar, axially extending recesses. Since the cylindrical end of the metering strip according to the invention covers a much larger angular range than the solutions known from the prior art, the angular range around which such a metering strip can be pivoted can be effectively increased without the undesirable side effect that the cylindrical end of the metering strip is moved away from the surface of the inking roller, which would result in an undesirable widening of the gap.
  • a swiveling of the metering strip by an angle as large as possible is desirable in order to facilitate the free flow of the ink.
  • a metering bar designed according to the invention can be pivoted through an angle of almost ⁇ 90 ° out of the normal position directed radially to the inking roller. Since the metering strip according to the invention can be pivoted within a large angular range, a comparatively large amount of friction work can be brought about by oscillating movement of the metering strip, in particular to produce highly viscous paint in the area of Distribute the point of contact between the inking roller and metering bar evenly.
  • the recesses adjoining the cylindrically shaped end of the metering strip according to the invention ensure that the stripped paint can flow backward from this cylindrical end into the recesses and from there along the adjoining part of the metering strip serving as a guide for the color back into a paint collecting container .
  • the fact that the recesses connect to the cylindrically shaped end also ensures the desired large swivel range of the metering bar.
  • the advantage brought about constructively by the invention is further promoted by a wear-resistant design of the cylindrical end of the metering strip, since, for example, an over-tensioning of the cylindrical end with a wear-resistant, film-like plate can be dispensed with.
  • a metering strip spanned with such a plate would namely have a complicated structure in order to make the design-related advantages of the invention come into play.
  • the cylindrically shaped end of the metering strip according to the invention preferably covers an angular range between 200 ° and 280 °; A coverage of approximately 250 ° is particularly favorable.
  • transition area between the cylindrically shaped end of the metering strip and the recesses arranged on both sides is particularly advantageously continuously shaped, so that the cylindrical end runs in tangential extension into a rounded recess or groove, which in turn continuously merges into the adjoining part of the metering strip, where the stripped ink flows off to be collected in a pool or the like.
  • the metering strip can be formed in one piece, but on the other hand it can also consist of several parts, at least the cylindrical end, a part arranged in a pivotable holder, which protrudes from the cylindrical end into the holder, and a further part that receives the recess, which are suitably rigidly connected to one another.
  • the one-piece metering bar represents a particularly preferred embodiment, because in this case the highest dimensional accuracies, in particular over the entire length of the metering bar, can be achieved. Fitting problems due to the connection of several parts, for example when gluing or welding, can be avoided. This advantage of one-piece construction comes into play particularly in the case of a multi-page wide metering strip, such as is used for so-called panorama printing.
  • the shape of the metering strip according to the invention in the region of the contact point with the inking roller and the part projecting into the pivotable holder with recesses on both sides can be produced by shape grinding or milling, spark erosion or other suitable machining methods.
  • the metering strip can be made of a suitable solid material, but preferably only the cylindrically shaped end is designed to be wear-resistant by using a suitable material, such as, for example, ceramic, sintered metal or a wear-resistant plastic. It is also sufficient to merely make its surface wear-resistant, which can advantageously be done by applying a suitable layer, such as carbides, nitrides, oxides, etc.
  • the printing unit shown schematically in FIG. 3, of a known offset rotary machine has a blanket cylinder 1, against which an impression cylinder 2 is attached, but which can also be designed as a further blanket cylinder.
  • a paper web 3 to be printed is passed between blanket cylinder 1 and impression cylinder 2 and printed.
  • An inking roller 6 with an elastic surface is in contact with a plate cylinder 4, which is used to transfer the ink from the inking roller 6 to the blanket cylinder 1.
  • a pre-dosed ink film 8 which has a constant dimension over the entire width of the ink application roller 6 and whose thickness is many times greater than that of the ink film 9 that can be transferred to the plate cylinder 4, is created with an ink application device 7
  • an ink fountain 10 is provided, which is provided with an ink knife 11 which determines the dosage and is adjustable in a known manner.
  • a portion of the pre-dosed ink film 8, which is taken up by the inking roller 6, is then stripped off with a metering bar 12 arranged downstream of the inking device 7, which in its normal position is approximately vertical, ie. that is, approximately in the radial direction, to the inking roller 6.
  • the ink film 9 which can be transferred to the plate cylinder 4 has a constant thickness over the entire width of the inking roller 6 on. This thickness can be adjusted by placing the metering bar on the inking roller 6 to a greater or lesser extent, which can be done with known adjustment mechanisms, not shown.
  • Fig. 2 shows a section of the inking roller 6, which is in contact with the metering bar 12.
  • the inking roller 6 is provided with an elastic coating 16 and rotates in the direction of arrow D.
  • the metering bar 12 has a cylindrical surface at the end 13 facing the inking roller 6.
  • the axis 17 of this cylindrical surface is also the axis of rotation about which the metering bar 12 can be pivoted by the angle ⁇ .
  • FIG. 1 finally shows the metering strip 12 with an end 13 which is cylindrically shaped over an angular range W and has a radius R, to which axially extending recesses 14 formed on both sides of the metering strip 12 are connected.
  • the recesses 14 are essentially V-shaped, so that the cylindrically shaped part 13 merges into the recesses 14 on both sides approximately in a tangential extension.
  • the narrowest point of the metering bar 12, which is defined by the recesses 14 on both sides, is rounded to promote the outflow of the stripped printing ink.
  • this metering bar 12 represents an almost continuously running drain surface for the stripped printing ink.
  • the radius R of the cylindrically shaped end 13 of the metering bar 12 is in the range between 0.3 and 1.5 mm.
  • This cylindrical end covers an angular range W that is greater than 180 °. In the illustrated embodiment, this angular range W is approximately 250 °.
  • the metering strip 12 can, owing to its pronounced, namely 180 ° overlapping, cylindrical end 13 with the recesses adjoining this cylindrically shaped end 13 on both sides of the metering strip 14 can be pivoted in a wide angular range ⁇ and thereby enables almost any desired position to the inking roller 6.
  • the angular range ⁇ usable for pivoting the metering bar 12 can thus be almost ⁇ 90 °, based on the normal position, without the free discharge of the stripped ink film in undesirably affect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Coating Apparatus (AREA)
  • Saccharide Compounds (AREA)
  • Paper (AREA)
  • Soil Working Implements (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Claims (8)

  1. Lame doseuse pour un groupe d'encrage d'une machine à imprimer, pour assurer le dosage d'une encre d'impression, en particulier un couteau racleur ou une racle, qui
    a) est fixée dans une fixation pivotante, et
    b) présente une extrémité (13) à forme cylindre, ayant un rayon (R), dans la plage comprise entre 0,3 et 1,5 mm, qui
    b1) est pressée sur un rouleau encreur (6), en constituant avec ce rouleau (6) un interstice de dosage pour l'encre d'impression à doser,
    caractérisée en ce que
    c) l'extrémité à forme cylindre (13) recouvre une plage angulaire (W) supérieure à 180°;
    d) des évidements (14) s'étendant axialement, réalisés de part et d'autre sur la lame doseuse (12), se raccordant à l'extrémité (13) à forme cylindre; et
    e) l'extrémité (13) à forme cylindrique est réalisée de façon à être résistante à l'usure.
  2. Lame doseuse selon la revendication 1, caractérisée en ce que la plage angulaire (W) est comprise entre 200° et 280°, et en particulier est d'à peu près 250°.
  3. Lame doseuse selon la revendication 1 ou 2, caractérisée en ce que la transition entre l'extrémité (13) à forme cylindrique et les évidements (14) est continue.
  4. Lame doseuse selon l'une des revendications 1 à 3, caractérisée en ce que l'extrémité (13) à forme cylindrique et la partie (15) pénétrant dans la fixation pivotante sont réalisées d'un seul tenant.
  5. Lame doseuse selon l'une des revendications 1 à 5, caractérisée en ce que la lame doseuse (12) est constituée de plusieurs parties, d'au moins l'extrémité cylindrique (13), de la partie (15) pénétrant dans la fixation pivotante et de la partie recevant l'évidement (14), ces parties étant reliées ensemble rigidement.
  6. Lame doseuse selon l'une des revendications 1 à 5, caractérisée en ce que l'extrémité (13) à forme cylindrique est constituée d'un matériau céramique, métallique fritté ou synthétique, résistant à l'usure.
  7. Lame doseuse selon l'une des revendications 1 à 6, caractérisée en ce que l'extrémité (13) à forme cylindrique présente une surface résistante à l'usure.
  8. Lame doseuse selon la revendication 7, caractérisée en ce que la surface résistante à l'usure est constituée par une couche métallique appliquée par vaporisation.
EP92811018A 1992-01-14 1992-12-22 Lame doseuse Expired - Lifetime EP0551797B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4200769A DE4200769C1 (fr) 1992-01-14 1992-01-14
DE4200769 1992-01-14

Publications (2)

Publication Number Publication Date
EP0551797A1 EP0551797A1 (fr) 1993-07-21
EP0551797B1 true EP0551797B1 (fr) 1996-06-05

Family

ID=6449492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92811018A Expired - Lifetime EP0551797B1 (fr) 1992-01-14 1992-12-22 Lame doseuse

Country Status (6)

Country Link
EP (1) EP0551797B1 (fr)
JP (1) JPH0796297B2 (fr)
AT (1) ATE138853T1 (fr)
DE (2) DE4200769C1 (fr)
DK (1) DK0551797T3 (fr)
FI (1) FI104545B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2707918B1 (fr) * 1993-07-19 1995-10-06 Chevreux Pierre Racle plastique pour l'essuyage de cylindres de machines d'impression.
DE29617230U1 (de) * 1996-10-04 1996-12-05 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Auftragseinrichtung zum Auftragen eines Streichmediums
DE29704025U1 (de) * 1997-03-06 1997-05-07 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Klinge für eine Auftragseinrichtung oder eine Rakelvorrichtung
DE29716647U1 (de) * 1997-09-17 1997-10-30 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Anpreßleiste
CN100551798C (zh) 2002-10-19 2009-10-21 柯尼格及包尔公开股份有限公司 对带进行生产和加工的机器的导向件
JP4922753B2 (ja) * 2003-03-20 2012-04-25 パナソニック株式会社 半導体装置およびその製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2110299C3 (de) * 1971-03-04 1973-10-04 Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg Farbmesser fur Farbwerke von Druckmaschinen
DE3225982A1 (de) * 1981-07-13 1983-02-03 Dahlgren Mfg. Co., 75235 Dallas, Tex. Farbwerk fuer eine lithographische druckmaschine
SE437683B (sv) * 1982-10-13 1985-03-11 Inventing Ab Schaber eller rakel - anliggande mot valsen - vid exv tryck-, ferg-, eller kreppning
JPS5973952A (ja) * 1982-10-21 1984-04-26 Toppan Printing Co Ltd ドクターロール及びそれを用いたインキング装置
JPH0675963B2 (ja) * 1986-12-09 1994-09-28 株式会社東京機械製作所 インキ供給装置
DE3714936A1 (de) * 1987-05-05 1988-12-08 Wifag Maschf Farbwerk fuer eine druckmaschine
DE3734747A1 (de) * 1987-10-10 1989-04-20 Johannes Zimmer Rakelvorrichtung
US5099783A (en) * 1990-04-17 1992-03-31 Graco Inc. Doctor blade cap

Also Published As

Publication number Publication date
DE59206495D1 (de) 1996-07-11
FI930128A0 (fi) 1993-01-13
FI104545B (fi) 2000-02-29
DE4200769C1 (fr) 1993-07-22
JPH0796297B2 (ja) 1995-10-18
JPH0623963A (ja) 1994-02-01
ATE138853T1 (de) 1996-06-15
FI930128A (fi) 1993-07-15
EP0551797A1 (fr) 1993-07-21
DK0551797T3 (da) 1996-10-21

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