EP0374710B1 - Dispositif d'encrage à racle - Google Patents

Dispositif d'encrage à racle Download PDF

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Publication number
EP0374710B1
EP0374710B1 EP89123008A EP89123008A EP0374710B1 EP 0374710 B1 EP0374710 B1 EP 0374710B1 EP 89123008 A EP89123008 A EP 89123008A EP 89123008 A EP89123008 A EP 89123008A EP 0374710 B1 EP0374710 B1 EP 0374710B1
Authority
EP
European Patent Office
Prior art keywords
doctor blade
ink
inking unit
unit according
screen roller
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
EP89123008A
Other languages
German (de)
English (en)
Other versions
EP0374710A3 (en
EP0374710A2 (fr
Inventor
Anton Hamm
John Dr. Thomas
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 EP0374710A2 publication Critical patent/EP0374710A2/fr
Publication of EP0374710A3 publication Critical patent/EP0374710A3/de
Application granted granted Critical
Publication of EP0374710B1 publication Critical patent/EP0374710B1/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
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers

Definitions

  • the invention relates to a doctor blade inking unit with at least one chamber doctor blade which can be adjusted to an anilox roller and which comprises an ink chamber consisting of a U-shaped base body, two side walls and at least one doctor blade which bends when it is bent in the direction of the side wall.
  • the invention has for its object to provide a doctor blade ink unit of this type, which has wear-free lateral boundaries, in which consequently no abrasion parts can be stored in the cups of the anilox roller, and which is simple.
  • doctor blade inking unit according to the invention is primarily intended for use in offset printing machines.
  • a chamber doctor blade In the exemplary embodiment shown, which is intended for use in an offset printing press, a chamber doctor blade, generally designated 1, is provided.
  • the chambered doctor blade 1 comprises a U-shaped base body 2, two side walls 3 and two doctor blades 4, 5.
  • the two doctor blades 4, 5 can each be fixed by means of a clamping bar 6, 7 and only schematically indicated screws 8.
  • An ink tray 9 is provided below the chambered doctor blade 1. The means for fixing these parts on the printing press and for ink supply are not shown, they result from the applications mentioned at the beginning.
  • the chamber doctor blade 1 can be adjusted with the two doctor blades 4, 5 against an anilox roller 10.
  • the doctor blade 4 scrapes off the excess ink supplied in the direction of rotation of the anilox roller 10 indicated by the arrow a, while the doctor blade 5 closes the chamber doctor blade 1 at the bottom.
  • each side wall 3 has an area 11 of lesser wall thickness facing the anilox roller 10, which preferably tapers in the direction of the anilox roller 10 and is delimited at the front by a curved narrow surface 12.
  • the surface 12 forms with the anilox roller 10 a gap 13, the height A of which is between 0.1 and 3 mm. It is not necessary that the gap height remains constant over the entire length, rather the gap height can also vary within the specified dimensions.
  • the inside 14 of the area 11 directly adjoins the inside 15 of the side wall 3, but, as shown in FIG. 4, is beveled by an acute angle ⁇ with respect to this.
  • the outer side 16 of the area 11 abuts an oblique end face 17 of the wall 3 approximately at right angles, so that the outer side 16 is set back inwards with respect to the outer side 18 of the wall 3.
  • the area 11 is further provided on its upper side with a bevel 19 which forms an acute angle with the upper side 20 of the side wall 3.
  • a wedge-shaped gap 21 thus results between the doctor blade 4 and the bevel 19.
  • the greatest height of this wedge-shaped gap in the region of the outer end of the doctor blade 4 is at least 0.1 mm. This bevel ensures that the doctor blade 4 can bend slightly resiliently when it is applied to the anilox roller 10.
  • the doctor blade 4 is pressed against the base body 2 as well as against the upper side 20 of each side wall 3 by means of the clamping bar 6.
  • the doctor blade 4 ends in the plane of the outer wall 18 of the side wall 3, it thus projects outwards beyond the regions 11 with its end facing the anilox roller 10.
  • the other doctor blade 5 is pressed against the base body 2 and the undersides of the side walls 3 and regions 11 by means of the clamping bar 7. So it closes the chambered doctor blade 1 up to the surface 12.
  • the arrangement can also be used for reversible printing presses in which the anilox roller then rotates in the opposite direction to the arrow a. In this case, however, it is more favorable to arrange both doctor blades with their ends facing the anilox roller tapering towards one another and to use the respectively negatively employed knife for doctoring off the ink supplied in excess.
  • drain plate 22 On each outside 18 and thus also on the lateral outside of the doctor blade 4 there is a drain plate 22.
  • the drain plate 22 extends at one end at least up to the end faces of the doctor blade 4 and at the other end to just above the ink tray 9.
  • the drain plate 22 is connected to the associated side wall 3 by screws 23.
  • the lower end 24 of the drain plate 22 facing the paint tray 9 is expediently angled inward so that paint dripping along the drain plate will certainly get into the paint tray 9.
  • Bypass bores 25 can also be provided in the regions 11. As a result, an undesirably high hydrodynamic pressure on the doctor blade 4 can be avoided during operation, which can deform the blade knife 4 in particular in the case of a knife positioned positively on the anilox roller 10 and thus leads to an uneven adjustment to the anilox roller 10.
  • the dynamic viscosity of which is greater than 1 dPas (decipascal second), preferably greater than 40 dPas, and if it is placed against the anilox roller 10, ink initially spills out of the gap 13 as well as out of the wedge-shaped gap 21.
  • the paint can drip back into the paint tray 9 through the space between the drain plate 22 and the outside 16 of the area 11 of the side wall 3. It has been shown that when the anilox roller 10 is stationary, there is no significant wetting of the anilox roller 10 with ink in the area of the protrusion of the doctor blade 4 over the area 11 of the side wall 3.
  • the surface of the anilox roller 10 takes the ink within the chamber doctor blade 1 in the circumferential direction of the anilox roller 10.
  • the color that does not enter the wells of the anilox roller 10 is carried along in the direction of the arrows b to d.
  • the speed is directly adjacent to the anilox roller 10, cf. Arrow b, largest.
  • the speed drops inwards, cf. Arrows c and d, ab.
  • the ink flow parallel to the axis of the anilox roller 10 is reduced. This means that, even at medium speeds, no more ink emerges through the gap 13.
  • the color passing through the gaps 21 ensures that the anilox roller 10 is inked to such an extent that the outer sides 16 of the areas 11 of the side walls 3 can coincide approximately with the set edges.
  • the ink emerging from the column 12 colors the anilox roller 10 in this area during operation so well that the solid ink density during printing in this marginal area is still in the range of the measurable tolerances, while practically no inking of the anilox roller 10 occurs outside this limit .

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Electroluminescent Light Sources (AREA)

Claims (6)

  1. Dispositif d'encrage à râcle possédant au moins une râcle à chambre pouvant être appliquée contre un cylindre tramé et comprenant une chambre d'encrage formée d'un corps de base en U, deux parois latérales et au moins une lame de raclage fléchissant en direction de la paroi latérale lors de l'application contre le cylindre, caractérisé en ce que, pour l'utilisation d'encres d'impression dont la viscosité dynamique est supérieure à 1 dPa.s,
    chacune des deux parois latérales (3) forme en position de fonctionnement une fente (13) de 0,1 à 3 mm avec le cylindre tramé (10),
    la lame de raclage (4) est pressée de façon étanche contre les deux parois latérales (3),
    les parois latérales (3) sont pourvues d'un biseau (19) sous l'extrémité de la lame de raclage (4) dirigée vers le cylindre tramé (10), en vue de la formation d'une fente (21) en forme de coin avec la lame (4) et un déflecteur d'écoulement (22) en tôle est disposé devant chacune des deux faces de tête latérales de la lame de raclage (4), déflecteur qui s'étend en direction d'un bac à encre (9) placé sous la râcle à chambre.
  2. Dispositif d'encrage à râcle selon la revendication 1, caractérisé en ce que chaque paroi latérale (3) comporte une partie (11) de plus faible épaisseur de paroi, dirigée vers le cylindre tramé (10), qui est pourvue dudit biseau (19) et dont le côté extérieur (16) est disposé en retrait par rapport au côté extérieur (18) de la partie restante de la paroi latérale (3) en vue de la formation d'un espace d'écoulement d'encre délimité extérieurement par le déflecteur d'écoulement (22).
  3. Dispositif d'encrage à râcle selon la revendication 1, caractérisé en ce que la hauteur maximale de la fente (21) en forme de coin est d'au moins 0,1 mm.
  4. Dispositif d'encrage à râcle selon une des revendications précédentes, caractérisé en ce que les parties amincies (11) se rétrécissent en direction du cylindre tramé (10).
  5. Dispositif d'encrage à râcle selon une des revendications précédentes, caractérisé en ce que des perçages de bipasse (25) sont prévus dans les parties amincies (11).
  6. Dispositif d'encrage à râcle selon une des revendications précédentes, caractérisé en ce qu'il est prévu pour l'utilisation d'encres d'impression dont la viscosité dynamique est supérieure à 40 dPa.s.
EP89123008A 1988-12-21 1989-12-13 Dispositif d'encrage à racle Expired - Lifetime EP0374710B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3843017 1988-12-21
DE3843017A DE3843017C1 (fr) 1988-12-21 1988-12-21

Publications (3)

Publication Number Publication Date
EP0374710A2 EP0374710A2 (fr) 1990-06-27
EP0374710A3 EP0374710A3 (en) 1990-12-12
EP0374710B1 true EP0374710B1 (fr) 1993-05-19

Family

ID=6369716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89123008A Expired - Lifetime EP0374710B1 (fr) 1988-12-21 1989-12-13 Dispositif d'encrage à racle

Country Status (5)

Country Link
US (1) US4982660A (fr)
EP (1) EP0374710B1 (fr)
JP (1) JP2766008B2 (fr)
CA (1) CA2005454C (fr)
DE (2) DE3843017C1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5182989A (en) * 1989-05-03 1993-02-02 Heidelberg Druckmaschinen Ag Sealing device
DE4012825A1 (de) * 1990-04-23 1991-10-24 Koenig & Bauer Ag Kammerrakel
US5125341A (en) * 1991-05-15 1992-06-30 Paper Converting Machine Company Ink unit for printing press and method
DE4213659C2 (de) * 1992-04-25 1995-06-08 Koenig & Bauer Ag Kurzfarbwerk für eine Rotationsdruckmaschine
DE4213660C2 (de) * 1992-04-25 1995-06-08 Koenig & Bauer Ag Kurzfarbwerk für eine Rollenrotationsdruckmaschine
DE9307999U1 (fr) * 1993-05-27 1993-07-22 Man Roland Druckmaschinen Ag, 63069 Offenbach, De
US5425809A (en) * 1993-06-17 1995-06-20 Howard W. DeMoore Anilox coater with brush
US5440982A (en) * 1993-07-01 1995-08-15 Meadows; Stanley J. Inking system for a printing press
DE4401365A1 (de) * 1994-01-18 1995-07-20 Roland Man Druckmasch Vorrichtung zur Einfärbung einer Rasterwalze
DE4401362C2 (de) * 1994-01-18 1997-12-11 Roland Man Druckmasch Verfahren und Rotationsdruckmaschine für indirekten Tiefdruck
DE4401332C2 (de) * 1994-01-18 1996-04-11 Roland Man Druckmasch Vorrichtung zum Füllen von Vertiefungen auf einer Mantelfläche eines rotierenden, kreiszylindrischen Körpers einer Druckmaschine
DE4447123C1 (de) * 1994-12-29 1996-04-11 Koenig & Bauer Albert Ag Kammerrakel für eine Rotationsdruckmaschine
DE59702966D1 (de) * 1996-12-21 2001-03-01 Koenig & Bauer Ag Verfahren zum Einfärben einer Rasterwalze
US6119595A (en) * 1997-10-06 2000-09-19 R. J. Reynolds Tobacco Company Gravure printing press with encapsulated ink applicator and method
DE19847108C2 (de) * 1998-10-13 2002-10-24 Windmoeller & Hoelscher Rasterwalze
DE19949103A1 (de) * 1999-10-12 2001-05-10 Kroenert Max Maschf Dichtungsanordnung für eine Druckkammerrakel
EP1293342A1 (fr) * 2001-09-14 2003-03-19 Windmöller & Hölscher KG Joint d'étanchéité pour un encreur à racles d'une machine à imprimer rotative
DE102005055156B3 (de) * 2005-11-18 2007-05-31 OCé PRINTING SYSTEMS GMBH Vorrichtung und Verfahren zur Entwicklung von auf einem Zwischenbildträger erzeugten Potentialbilder bei einer elektrografischen Druck- oder Kopiereinrichtung
EP2602111B1 (fr) * 2011-12-09 2014-07-02 Bobst Bielefeld GmbH Réservoir d'encre
BR112015022200A2 (pt) 2013-03-13 2017-07-18 Probity Eng Llc aparelho de fonte de tinta, sistema de prensa de impressão flexográfica e método para ajustar características de impressão em impressão flexográfica

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151968A (en) * 1936-07-27 1939-03-28 Standard Process Corp Fountain doctor
CH413872A (de) * 1962-11-13 1966-05-31 Winkler Fallert & Co Maschf Vorrichtung zum Verhindern des Zusammenfliessens zweier Farben unter dem Farbmesser von Hochdruck-, Offsetdruck- und ähnlichen Maschinen mit Abteilkeilen
DE2646071C2 (de) * 1976-10-13 1985-06-20 E.C.H. Will (Gmbh & Co), 2000 Hamburg Farbwerk eines Druckwerkes für eine Fertigungsstraße der papierverarbeitenden Industrie
DE3241124A1 (de) * 1982-11-06 1984-05-10 Koenig & Bauer AG, 8700 Würzburg Farbabteilkeil in einem farbkasten einer rotationsdruckmaschine
DE3704433A1 (de) * 1987-02-12 1988-08-25 Frankenthal Ag Albert Kurzfarbwerk

Also Published As

Publication number Publication date
EP0374710A3 (en) 1990-12-12
CA2005454C (fr) 1993-04-13
EP0374710A2 (fr) 1990-06-27
JPH02206553A (ja) 1990-08-16
DE3843017C1 (fr) 1990-05-23
CA2005454A1 (fr) 1990-06-21
JP2766008B2 (ja) 1998-06-18
US4982660A (en) 1991-01-08
DE58904437D1 (de) 1993-06-24

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