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EP0389922A2 - Inking device - Google Patents

Inking device Download PDF

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Publication number
EP0389922A2
EP0389922A2 EP90105183A EP90105183A EP0389922A2 EP 0389922 A2 EP0389922 A2 EP 0389922A2 EP 90105183 A EP90105183 A EP 90105183A EP 90105183 A EP90105183 A EP 90105183A EP 0389922 A2 EP0389922 A2 EP 0389922A2
Authority
EP
European Patent Office
Prior art keywords
ink
receiving roller
roller
side wall
ink receiving
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.)
Granted
Application number
EP90105183A
Other languages
German (de)
French (fr)
Other versions
EP0389922B1 (en
EP0389922A3 (en
Inventor
Thomas Dr. 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 EP0389922A2 publication Critical patent/EP0389922A2/en
Publication of EP0389922A3 publication Critical patent/EP0389922A3/en
Application granted granted Critical
Publication of EP0389922B1 publication Critical patent/EP0389922B1/en
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 an inking unit for a printing press with an ink chamber, which is delimited along one side by a rotating ink-receiving roller and has side walls, the end faces of which are facing the ink-receiving roller are curved in accordance with the radius of the ink-receiving roller.
  • the side walls of such an ink chamber are usually arranged parallel to one another and are perpendicular to the axis of the ink pickup roller. This has the disadvantage that the overpressure occurring in the ink chamber presses ink outwards between the ink take-off roller and the end faces of the side walls facing it. This disadvantage occurs in particular when no elastic seal is provided between the ink pick-up roller and the side walls, the seal provided is worn or a non-contact seal is used.
  • the object of the invention is to create a generic arrangement in which the possibility of lateral color leakage is at least reduced.
  • the exemplary embodiment shows a chamber doctor blade, designated overall by 1, which is intended for use in an offset printing machine.
  • the doctor blade 1 comprises a U-shaped base body 2, two side walls 3 and two doctor blades 4, 5.
  • the doctor blades 4, 5 can each be fixed by means of a clamping bar 6, 7 and only schematically indicated screws 8.
  • the chambered doctor blade 1 can be adjusted with the two doctor blades 4, 5 against an ink pickup roller 9 which is provided with a rastered surface and which rotates in the direction of arrow a during operation.
  • the doctor blade 4 scrapes off the excess ink supplied from the ink pick-up roller, while the doctor blade 5 closes the chamber doctor blade 1 at the bottom.
  • Each side wall 3 has an area 10 of smaller wall thickness facing the ink pick-up roller 9.
  • the area 10 is delimited by an end face 11 which is bent in accordance with the radius of the work take-up roller 9 and forms a gap with a height A of approximately 0.1 to 3 mm.
  • an elastic sealing material could also be applied to the end face 11, the surface of which rests on the ink-receiving roller 9, or the side wall 3 could be resiliently pressed against the ink-receiving roller 9 with the end face 11.
  • a drain plate 12 is fastened, which guides ink passing through, in particular when the ink pick-up roller 9 is stationary or slowly rotating, to a drain pan, not shown.
  • each side wall 3 and thus the end face 11 thereof starting from the contact point B of the ink pick-up roller 9 in the area of the doctor blade 5 to the drainage point C in the area of the doctor blade 4, is arranged to be inclined outwards. This inclination continues on the inside over the entire length of the side wall 3.
  • the entire side wall 3 can also be arranged inclined. Occurs during operation within the ink chamber 1 a pressure P1 in the liquid paint, which is greater than the ambient air pressure P0, this results in a movement component of the color between the end face 11 and Ink pick-up roller 9 to the outside with the speed vector v a (see FIG. 3).
  • the rotation of the ink pick-up roller 9 in the direction of arrow a during operation results in a movement component with the speed vector v t for the ink.
  • a resultant velocity can be determined from both vectors with the vector V res .
  • the inclination of the end face 11 to the outside by the angle ⁇ is now chosen so that this angle is equal to or greater than the angle ⁇ between the vectors v t and V res . It is thereby achieved that the ink located between the ink pick-up roller 9 and the end face 11 cannot move outwards.
  • the invention is not limited to the chambered doctor blade shown, rather it can also be used in ink fountains for film or lifter inking units.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)

Abstract

The inking device for a printing machine has an ink chamber which is bounded along one side wall by a rotating ink receiving roller. In order to reduce an escape of ink between the ink receiving roller and the end faces of the side walls which are bent to correspond to the radius of the ink receiving roller, at least the region of each side wall facing the ink receiving roller is arranged so as to be inclined widening outwards from the inlet point to the outlet point of the ink receiving roller. …<IMAGE>…

Description

Die Erfindung betrifft ein Farbwerk für eine Druckmaschine mit einer Farbkammer, die entlang einer Seite durch eine rotierende Farbaufnahmewalze begrenzt ist und Seitenwände aufweist, deren der Farbaufnahmewalze zugewandte Stirnflächen entsprechend dem Radius der Farbaufnahmewalze gebogen ausgeführt sind.The invention relates to an inking unit for a printing press with an ink chamber, which is delimited along one side by a rotating ink-receiving roller and has side walls, the end faces of which are facing the ink-receiving roller are curved in accordance with the radius of the ink-receiving roller.

Üblicherweise sind die Seitenwände einer derartigen Farbkammer untereinander parallel angeordnet und stehen senkrecht zur Achse der Farbaufnahmewalze. Hierbei ergibt sich der Nachteil, daß der in der Farbkammer auftretende Überdruck Farbe zwischen der Farbabnahmewalze und den ihr zugewandten Stirnflächen der Seitenwände nach außen drückt. Dieser Nachteil tritt insbesondere dann auf, wenn zwischen der Farbaufnahmewalze und den Seitenwänden keine elastische Dichtung vorgesehen, die vorgesehene Dichtung verschlissen ist oder eine berührungsfreie Dichtung verwendet wird.The side walls of such an ink chamber are usually arranged parallel to one another and are perpendicular to the axis of the ink pickup roller. This has the disadvantage that the overpressure occurring in the ink chamber presses ink outwards between the ink take-off roller and the end faces of the side walls facing it. This disadvantage occurs in particular when no elastic seal is provided between the ink pick-up roller and the side walls, the seal provided is worn or a non-contact seal is used.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine gattungsgemäßes Anordnung zu schaffen, bei der die Möglichkeit eines seitlichen Farbaustritts zumindest vermindert ist.Proceeding from this, the object of the invention is to create a generic arrangement in which the possibility of lateral color leakage is at least reduced.

Diese Aufgabe wird durch Anwendung der Merkmale des Kennzeichens des Patentanspruchs gelöst.This object is achieved by applying the features of the characterizing part of the patent claim.

Auf der Zeichnung ist ein Ausführungsbeispiel der Erfindung wiedergegeben. Es zeigt

  • Fig. 1 eine Seitenansicht der erfindungsgemäß wesentlichen Teile des Farbwerks,
  • Fig. 2 eine Ansicht einer Seitenwand des Farbwerks nach Fig. 1 von vorn und
  • Fig. 3 den Ausschnitt III in Fig. 2 in vergrößerter Darstellung.
In the drawing, an embodiment of the invention is shown. It shows
  • 1 is a side view of the essential parts of the inking unit according to the invention,
  • Fig. 2 is a view of a side wall of the inking unit according to Fig. 1 from the front and
  • Fig. 3 shows the detail III in Fig. 2 in an enlarged view.

Das Ausführungsbeispiel zeigt ein insgesamt mit 1 bezeichnetes Kammerrakel, das zum Einsatz in einer Offsetdruckmaschine bestimmt ist. Das Kammerrakel 1 umfaßt einen U-förmigen Grundkörper 2, zwei Seitenwände 3 und zwei Rakelmesser 4, 5. Die Rakelmesser 4, 5 sind jeweils mittels einer Spannleiste 6, 7 und nur schematisch angedeuteten Schrauben 8 festlegbar. Das Kammerrakel 1 ist mit den beiden Rakelmessern 4, 5 gegen eine mit einer gerasterten Oberfläche versehene Farbaufnahmewalze 9 anstellbar, die sich im Betrieb in Richtung des Pfeiles a dreht. Dabei rakelt das Rakelmesser 4 die zugeführte überschüssige Farbe von der Farbaufnahmewalze ab, während das Rakelmesser 5 die Kammerrakel 1 nach unten abschließt. Jede Seitenwand 3 weist einen der Farbaufnahmewalze 9 zugewandten Bereich 10 geringerer Wandstärke auf. Der Bereich 10 ist durch eine Stirnfläche 11 begrenzt, die entsprechend dem Radius der Arbaufnahmewalze 9 gebogen ist und mit dieser einen Spalt mit einer Höhe A von etwa 0,1 bis 3 mm bildet. Auf der Stirnfläche 11 könnte jedoch auch ein elastisches Dichtungsmaterial aufgebracht sein, dessen Oberfläche an der Farbaufnahmewalze 9 anliegt, oder es könnte die Seitenwand 3 mit der Stirnfläche 11 federnd gegen die Farbaufnahmewalze 9 angedrückt sein.The exemplary embodiment shows a chamber doctor blade, designated overall by 1, which is intended for use in an offset printing machine. The doctor blade 1 comprises a U-shaped base body 2, two side walls 3 and two doctor blades 4, 5. The doctor blades 4, 5 can each be fixed by means of a clamping bar 6, 7 and only schematically indicated screws 8. The chambered doctor blade 1 can be adjusted with the two doctor blades 4, 5 against an ink pickup roller 9 which is provided with a rastered surface and which rotates in the direction of arrow a during operation. The doctor blade 4 scrapes off the excess ink supplied from the ink pick-up roller, while the doctor blade 5 closes the chamber doctor blade 1 at the bottom. Each side wall 3 has an area 10 of smaller wall thickness facing the ink pick-up roller 9. The area 10 is delimited by an end face 11 which is bent in accordance with the radius of the work take-up roller 9 and forms a gap with a height A of approximately 0.1 to 3 mm. However, an elastic sealing material could also be applied to the end face 11, the surface of which rests on the ink-receiving roller 9, or the side wall 3 could be resiliently pressed against the ink-receiving roller 9 with the end face 11.

An der Außenseite der Seitenwand 3 ist ein Ablaufblech 12 befestigt, das insbesondere bei stehender oder langsam rotierender Farbaufnahmewalze 9 durchtretende Farbe zu einer nicht dargestellten Ablaufwanne leitet.On the outside of the side wall 3, a drain plate 12 is fastened, which guides ink passing through, in particular when the ink pick-up roller 9 is stationary or slowly rotating, to a drain pan, not shown.

Der Bereich 10 jeder Seitenwand 3 und damit deren Stirnfläche 11 ist ausgehend von der Anlaufstelle B der Farbaufnahmewalze 9 im Bereich des Rakelmessers 5 bis zur Ablaufstelle C im Bereich des Rakelmessers 4 sich nach außen erweiternd geneigt angeordnet. Diese Neigung setzt sich innen über die gesamte Länge der Seitenwand 3 fort. Selbstverständlich kann auch die gesamte Seitenwand 3 geneigt angeordnet sein. Tritt während des Betriebes innerhalb der Farbkammer 1 ein Druck P₁ in der flüssigen Farbe auf, der größer ist als der Umgebungsluftdruck P₀, so ergibt sich hierdurch eine Bewegungskomponente der Farbe zwischen der Stirnfläche 11 und der Farbaufnahmewalze 9 nach außen mit dem Geschwindigkeitsvektor va (vgl. Fig.3). Durch die Rotation der Farbaufnahmewalze 9 in Richtung des Pfeiles a während des Betriebes, ergibt sich für die Farbe weiterhin eine Bewegungskomponente mit dem Geschwindigkeitsvektor vt. Aus beiden Vektoren läßt sich eine resultierende Geschwindigkeit mit dem Vektor Vres ermitteln. Die Neigung der Stirnfläche 11 nach außen um den Winkel α wird nun so gewählt, daß dieser Winkel gleich oder größer als der Winkel ß zwischen den Vektoren vt und Vres ist. Dadurch wird erreicht, daß sich die zwischen der Farbaufnahmewalze 9 und der Stirnfläche 11 befindliche Farbe nicht nach außen bewegen kann. Insbesondere dann, wenn der Winkel α größer als ß gewählt wird, ergibt sich ein Vektor Vres, der so gerichtet ist, daß die sich zwischen der Farbaufnahmewalze 9 und der Stirnfläche 11 befindliche Farbe in den oberen sich erweiternden Teil des Innenraumes des Grundkörpers 2 zurückgeführt wird.The area 10 of each side wall 3 and thus the end face 11 thereof, starting from the contact point B of the ink pick-up roller 9 in the area of the doctor blade 5 to the drainage point C in the area of the doctor blade 4, is arranged to be inclined outwards. This inclination continues on the inside over the entire length of the side wall 3. Of course, the entire side wall 3 can also be arranged inclined. Occurs during operation within the ink chamber 1 a pressure P₁ in the liquid paint, which is greater than the ambient air pressure P₀, this results in a movement component of the color between the end face 11 and Ink pick-up roller 9 to the outside with the speed vector v a (see FIG. 3). The rotation of the ink pick-up roller 9 in the direction of arrow a during operation results in a movement component with the speed vector v t for the ink. A resultant velocity can be determined from both vectors with the vector V res . The inclination of the end face 11 to the outside by the angle α is now chosen so that this angle is equal to or greater than the angle β between the vectors v t and V res . It is thereby achieved that the ink located between the ink pick-up roller 9 and the end face 11 cannot move outwards. In particular, if the angle α is chosen to be greater than β, a vector V res results which is directed in such a way that the color located between the ink pick-up roller 9 and the end face 11 is returned to the upper, widening part of the interior of the base body 2 becomes.

Die Erfindung ist nicht auf das dargestellte Kammerrakel beschränkt, vielmehr kann sie auch bei Farbkästen für Film- oder Heberfarbwerke Anwendung finden.The invention is not limited to the chambered doctor blade shown, rather it can also be used in ink fountains for film or lifter inking units.

Claims (1)

Farbwerk für eine Druckmaschine mit einer Farbkammer, die entlang einer Seite durch eine rotierende Farbaufnahmewalze begrenzt ist und Seitenwand aufweist, deren der Farbaufnahmewalze zugewandte Stirnflächen entsprechend dem Radius der Farbaufnahmewalze gebogen ausgeführt sind, dadurch gekennzeichnet, daß zumindest der der Farbaufnahmewalze (9) zugewandte Bereich (10) jeder Seitenwand ausgehend von der Anlaufstelle (B) bis zur Ablaufstelle (C) der Farbaufnahmewalze (9) sich nach außen erweiternd geneigt angeordnet ist.Inking unit for a printing press with an ink chamber which is delimited along one side by a rotating ink-receiving roller and has a side wall whose end faces facing the ink-receiving roller are curved in accordance with the radius of the ink-receiving roller, characterized in that at least the area facing the ink-receiving roller (9) 10) each side wall, starting from the contact point (B) to the discharge point (C) of the ink pick-up roller (9), is arranged to be inclined outward widening.
EP90105183A 1989-03-25 1990-03-20 Inking device Expired - Lifetime EP0389922B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909878A DE3909878C1 (en) 1989-03-25 1989-03-25
DE3909878 1989-03-25

Publications (3)

Publication Number Publication Date
EP0389922A2 true EP0389922A2 (en) 1990-10-03
EP0389922A3 EP0389922A3 (en) 1991-05-02
EP0389922B1 EP0389922B1 (en) 1993-11-10

Family

ID=6377215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90105183A Expired - Lifetime EP0389922B1 (en) 1989-03-25 1990-03-20 Inking device

Country Status (4)

Country Link
US (1) US5044277A (en)
EP (1) EP0389922B1 (en)
JP (1) JP2807032B2 (en)
DE (2) DE3909878C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5671673A (en) * 1992-05-22 1997-09-30 Booese; Angstrom Ke Chambered doctor blade device for printing unit

Families Citing this family (13)

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Publication number Priority date Publication date Assignee Title
DE4118426A1 (en) * 1991-06-05 1992-12-10 Koenig & Bauer Ag CHAMBER Squeegee for an inking unit of a rotary printing press
US5230286A (en) * 1991-10-11 1993-07-27 De La Rue Giori, S.A. Inking unit for a printing machine
DE4213660C2 (en) * 1992-04-25 1995-06-08 Koenig & Bauer Ag Short inking unit for a web-fed rotary printing press
DE4213659C2 (en) * 1992-04-25 1995-06-08 Koenig & Bauer Ag Short inking unit for a rotary printing press
FR2705613B1 (en) * 1993-05-27 1995-11-24 Roland Man Druckmasch Chamber squeegee.
DE4447123C1 (en) * 1994-12-29 1996-04-11 Koenig & Bauer Albert Ag Scraper for printing ink cavity in rotary printing press
DE19523378A1 (en) * 1995-06-30 1997-01-02 Koenig & Bauer Albert Ag Sheet offset rotary printing machine
DE19643984B4 (en) * 1996-10-31 2005-01-05 Man Roland Druckmaschinen Ag Function control for a dosing device
EP1293342A1 (en) * 2001-09-14 2003-03-19 Windmöller &amp; Hölscher KG End sealing for the scraper chamber of a rotary printing press
US7546802B2 (en) * 2003-07-28 2009-06-16 Goss International Americas, Inc. Fluid supply device for a printing machine
MX339628B (en) * 2011-11-03 2016-06-02 Tetra Laval Holdings & Finance An apparatus for flexographic printing of a web of packaging material.
US9296201B2 (en) 2013-03-13 2016-03-29 Probity Engineering, Llc Ink fountain apparatus and method of adjusting ink flow for a flexographic printing apparatus
GB2582635B (en) * 2019-03-28 2021-12-29 Archipelago Tech Group Ltd Device, method, and assembly for loading nozzles with fluid

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112543A2 (en) * 1982-12-24 1984-07-04 Erich Beck Inking device, in particular for flexographic and intaglio printing machines with a transfer roller which can be driven at a variable speed

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DE2550720A1 (en) * 1975-11-12 1977-06-02 Roland Offsetmaschf DOSING DEVICE ON A PAINT BOX
US4058058A (en) * 1976-02-26 1977-11-15 George Hantscho Company, Inc. Ink fountain for printing presses
DE2811276C2 (en) * 1978-03-15 1985-04-25 Mathias Bäuerle GmbH, 7742 St Georgen Device for metered supply of ink to a duct roller of an offset printing device
US4222328A (en) * 1978-07-21 1980-09-16 Flex-O-Line Division Of Kenton Machine Works Doctor blade liquid applicator for metering rolls
US4263848A (en) * 1980-02-08 1981-04-28 American Newspaper Publishers Association Method and apparatus for reducing air entrapment in rotary inking systems
DE3320638C2 (en) * 1983-06-08 1986-10-16 Koenig & Bauer AG, 8700 Würzburg Ink dividing device on ink fountain rollers of printing machines
DE3408183C1 (en) * 1984-03-06 1985-03-28 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Ink fountain for printing machines
US4819558A (en) * 1985-04-18 1989-04-11 Pamarco Incorporated High efficiency fluid metering roll
DE3519294A1 (en) * 1985-05-30 1986-12-04 Koenig & Bauer AG, 8700 Würzburg WATER CASE FOR A DAMPING UNIT OF AN OFFSET ROTATION PRINTING MACHINE
US4688482A (en) * 1986-01-31 1987-08-25 Tobias Philip E Ink transfer arrangement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112543A2 (en) * 1982-12-24 1984-07-04 Erich Beck Inking device, in particular for flexographic and intaglio printing machines with a transfer roller which can be driven at a variable speed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5671673A (en) * 1992-05-22 1997-09-30 Booese; Angstrom Ke Chambered doctor blade device for printing unit

Also Published As

Publication number Publication date
JP2807032B2 (en) 1998-09-30
DE3909878C1 (en) 1990-08-02
JPH02274542A (en) 1990-11-08
EP0389922B1 (en) 1993-11-10
US5044277A (en) 1991-09-03
DE59003395D1 (en) 1993-12-16
EP0389922A3 (en) 1991-05-02

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