EP2602111A1 - Farbkasten - Google Patents

Farbkasten Download PDF

Info

Publication number
EP2602111A1
EP2602111A1 EP11192758.8A EP11192758A EP2602111A1 EP 2602111 A1 EP2602111 A1 EP 2602111A1 EP 11192758 A EP11192758 A EP 11192758A EP 2602111 A1 EP2602111 A1 EP 2602111A1
Authority
EP
European Patent Office
Prior art keywords
roller
ink
seals
ink fountain
sheet
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
EP11192758.8A
Other languages
English (en)
French (fr)
Other versions
EP2602111B1 (de
Inventor
Wolfgang Brusdeilins
Gordon Whitelaw
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.)
Bobst Bielefeld GmbH
Original Assignee
Bobst Bielefeld GmbH
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 Bobst Bielefeld GmbH filed Critical Bobst Bielefeld GmbH
Priority to ES11192758.8T priority Critical patent/ES2496066T3/es
Priority to EP20110192758 priority patent/EP2602111B1/de
Publication of EP2602111A1 publication Critical patent/EP2602111A1/de
Application granted granted Critical
Publication of EP2602111B1 publication Critical patent/EP2602111B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F9/00Rotary intaglio printing presses
    • B41F9/06Details
    • B41F9/061Inking devices
    • B41F9/068End seals between cylinder and housing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F31/00Inking arrangements or devices
    • B41F31/02Ducts, containers, supply or metering devices
    • B41F31/06Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F31/00Inking arrangements or devices
    • B41F31/02Ducts, containers, supply or metering devices
    • B41F31/06Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders
    • B41F31/07Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders for rotogravure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F9/00Rotary intaglio printing presses
    • B41F9/06Details
    • B41F9/08Wiping mechanisms
    • B41F9/10Doctors, scrapers, or like devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F9/00Rotary intaglio printing presses
    • B41F9/06Details
    • B41F9/08Wiping mechanisms
    • B41F9/10Doctors, scrapers, or like devices
    • B41F9/1072Blade construction

Definitions

  • the invention relates to an ink fountain for inking a roller, the fountain comprising an ink chamber extending along the roller and having an opening that opens out towards a peripheral surface of the roller, said opening being bounded by doctor blades in circumferential direction of the roller and by seals in axial direction of the roller.
  • ink fountains are used for inking a roller in a rotary printing press or in a so-called proofer apparatus that is used for making a colour proof prior to actual printing.
  • the roller to be inked may be a gravured inking roller or an anilox roller.
  • a conventional ink fountain has a body that forms the ink chamber, and two separate blade members made of metal are clamped to the body so as to form the doctor blades. Separate seal members are mounted on both axial ends of the body.
  • the seals and at least one of the doctor blades are formed by a one-piece sheet that is angled at an edge of the doctor blade.
  • seals and the doctor blade are formed in one piece, there is no joint between them, and consequently there is no risk of ink leaking out. Moreover, problems with differential wear of the doctor blade and the seals are mitigated because the seals and the doctor blade are made of the same material, e.g. metal.
  • the one-piece sheet forms two doctor blades that are connected by the seals.
  • the doctor blade and seal structure may be formed by cutting or punching a rectangular opening into a blank of sheet metal so as to obtain a sheet metal frame the longitudinal legs of which will form the doctor blades whereas the shorter legs will form the seals.
  • At least one of the doctor blades may have a sharpened edge for engaging the roller.
  • a resilient cushion may be provided between the sheet and the body of the ink fountain.
  • the ink fountain according to the invention is particularly suited for use in a proofer apparatus, e.g. a proofer apparatus of the type described in applicant's co-pending European patent application EP 11 155 963.9 filed on February 25, 2011 .
  • an ink fountain 10 is set against a peripheral surface of an a gravured inking roller 12 of a proofer apparatus, so that ink may be applied to the surface of the inking roller.
  • the ink fountain 10 has a body 14 defining an ink chamber 16 that extends in axial direction along the inking roller 12 and has an opening 18 that opens out towards the surface of the inking roller.
  • the ink chamber 16 may be filled with liquid ink via a supply passage that has not been shown in the drawing.
  • the opening 18 of the ink chamber 16 is bounded in circumferential direction of the inking roller 12 by an upstream doctor blade 20 and a downstream doctor blade 22.
  • upstream and downstream refer to the direction of a rotation of the inking roller 12 that is indicated by an arrow in Fig. 1 .
  • the opening 18 is bounded by arcuate seals 24 that engage the peripheral surface of the inking roller and interconnect the two doctor blades 20, 22.
  • the seals 24 In the cross-sectional view in Fig. 1 , only one of the seals 24 is visible.
  • the doctor blades 20, 22 and the seals 24 are formed by a one-piece sheet 26, e.g. a thin sheet of spring steel which may have a thickness in the order of magnitude of 0.15 mm.
  • the doctor blade 20 forms an edge 28 that delimits the opening 18, and it is angled from the seals 24 along a straight line 30 that coincides with the edge 28.
  • the downstream doctor blade 22 has an edge 32 and is angled from the seals 24 along a straight line 34 that coincides with the edge 32.
  • the angle formed between the doctor blade 20 and the peripheral surface of the inking roller 12 is approximately 23°.
  • the edge 28 wipes over the surface of the inking roller, so that the doctor blade 20 retains the ink in the ink chamber 16.
  • the edge 32 of the downstream doctor blade 22 forms an angle of approximately 39° with the surface of the inking roller 12.
  • the doctor blade 22 projects towards the surface of the inking roller 12 in the direction opposite to the direction of movement of that surface, so that the edge 32 scrapes over the surface of the inking roller.
  • the inking roller has a pattern of minute pits which are filled with ink when the surface of the inking roller passes through the ink chamber 16. Then, when the surface passes the edge 32, the ink is scraped off from the surface of the inking roller, so that ink remains only in the pits thereof.
  • the configuration of the doctor blades 20, 22 and the seals 24 shown in Fig. 2 may be obtained by cutting or punching the rectangular opening 18 out of a flat blank for the sheet 26 and pressing the sheet into the shape shown in Fig. 2 .
  • the sheet 26 takes the configuration of a rectangular frame with the doctor blades 20 and 22 as longer (longitudinal) legs and the seals 24 as shorter legs.
  • the process of punching and pressing may be performed in a single operation.
  • the opening 18 may be cut out while the sheet is still in a flat shape, and the sheet is pressed into the desired shape in a subsequent separate step.
  • This may have the result that the edge 32 engages the surface of the inking roller with an acute knife edge 36 as is shown in Fig. 3 .
  • This effect may be enhanced by forming minute incisions 38 ( Fig. 2 ) at both ends of the edge 32.
  • the depth of the incisions 38 has been exaggerated in Fig. 2 for illustration purposes. In practice, the depth of these incisions will be smaller than the thickness of the sheet metal forming the sheet 26.
  • the acute knife edge 36 may also be formed by post-processing the edge 32, e.g. by sharpening the same in a grinding or hammering process.
  • the sheet 26 is secured to the body 14 of the ink fountain by means of clamping plates 40 and bolts 42.
  • a resilient cushion layer 44 is interposed between the sheet 26 and the body 14 of the ink fountain.
  • the cushion layer 44 is congruent with the sheet 26 and consequently has a rectangular opening corresponding to the opening 18.
  • the cushion layer 44 serves a seal between the sheet 26 and the body 14 of the ink fountain and also permits to resiliently bias the edges of the doctor blades 20, 22 as well as the seals 24 against the surface of the inking roller 12, thus assuring a good line contact between the doctor blades and the inking roller and a good surface contact between the seals 24 and the inking roller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP20110192758 2011-12-09 2011-12-09 Farbkasten Active EP2602111B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES11192758.8T ES2496066T3 (es) 2011-12-09 2011-12-09 Fuente de tinta
EP20110192758 EP2602111B1 (de) 2011-12-09 2011-12-09 Farbkasten

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20110192758 EP2602111B1 (de) 2011-12-09 2011-12-09 Farbkasten

Publications (2)

Publication Number Publication Date
EP2602111A1 true EP2602111A1 (de) 2013-06-12
EP2602111B1 EP2602111B1 (de) 2014-07-02

Family

ID=45346311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110192758 Active EP2602111B1 (de) 2011-12-09 2011-12-09 Farbkasten

Country Status (2)

Country Link
EP (1) EP2602111B1 (de)
ES (1) ES2496066T3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6183765B1 (ja) * 2017-03-06 2017-08-23 下村 恭一 インキ飛散防止カバー及びグラビア印刷装置
EP3693167A1 (de) 2019-02-11 2020-08-12 Bobst Bielefeld GmbH Drucksystem mit tintenreservoir

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595070A (en) * 1948-03-02 1952-04-29 Rca Corp Ink transfer device
EP0374710A2 (de) * 1988-12-21 1990-06-27 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Rakelfarbwerk

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595070A (en) * 1948-03-02 1952-04-29 Rca Corp Ink transfer device
EP0374710A2 (de) * 1988-12-21 1990-06-27 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Rakelfarbwerk

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6183765B1 (ja) * 2017-03-06 2017-08-23 下村 恭一 インキ飛散防止カバー及びグラビア印刷装置
EP3693167A1 (de) 2019-02-11 2020-08-12 Bobst Bielefeld GmbH Drucksystem mit tintenreservoir

Also Published As

Publication number Publication date
ES2496066T3 (es) 2014-09-18
EP2602111B1 (de) 2014-07-02

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