EP0294042A2 - Tiefdruck - Google Patents

Tiefdruck Download PDF

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Publication number
EP0294042A2
EP0294042A2 EP88304242A EP88304242A EP0294042A2 EP 0294042 A2 EP0294042 A2 EP 0294042A2 EP 88304242 A EP88304242 A EP 88304242A EP 88304242 A EP88304242 A EP 88304242A EP 0294042 A2 EP0294042 A2 EP 0294042A2
Authority
EP
European Patent Office
Prior art keywords
impression roll
contacts
blades
impression
roll
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.)
Withdrawn
Application number
EP88304242A
Other languages
English (en)
French (fr)
Other versions
EP0294042A3 (de
Inventor
Frank Henry Aylett
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.)
Crosfield Electronics Ltd
Original Assignee
Crosfield Electronics Ltd
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 Crosfield Electronics Ltd filed Critical Crosfield Electronics Ltd
Publication of EP0294042A2 publication Critical patent/EP0294042A2/de
Publication of EP0294042A3 publication Critical patent/EP0294042A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/001—Heliostatic printing

Definitions

  • the invention relates to gravure printing and in particular apparatus for use in a gravure press.
  • WO-A-84/03068 describes an electrostatic assist gravure press in which the impression roll is charged directly via a number of spaced, stainless steel wiper blades which, in the operating position are urged under spring action against the roll. As the roll rotates, charge is transferred from the contacts onto the roll. The wiper blades are individually pivotable away from the impression roll so that the gravure press can deal with webs of different widths and keep charge losses to a minimum.
  • the apparatus comprising an impression roll and a plurality of laterally spaced electrical contacts contacting the surface of the impression roll, the plurality of spaced contacts being connected to a power source, in use, to enable a charge to be applied to the surface of the impression roll by each contact wherein the spaced contacts comprise a plurality of deflectable electrically conductive filaments.
  • the electrically conductive filaments are fabricated from stainless steel and most conveniently comprise bristles.
  • Statstrip manufactured by Kleeneze Industrial of Martins Road, Hanham, Bristol
  • Ststrip manufactured by Kleeneze Industrial of Martins Road, Hanham, Bristol
  • Figure 1 illustrates an electrostatic assist gravure press.
  • An impression roll 1 is positioned adjacent to and in contact with a gravure cylinder 2.
  • An ink fountain 3 is arranged concentrically with the gravure cylinder 2 to supply ink 4 to the surface of the gravure cylinder 2 as the gravure cylinder 2 is rotated by conventional means through the ink fountain 3.
  • a doctor blade (not shown) removes excess ink from the surface of the gravure cylinder 2.
  • the impression roll 1 includes a hollow metal core 5, an intermediate rubber insulating layer 6 and an outer semi-conducting layer 7.
  • the metal core 5 of the impression roll 1 is electrically earthed.
  • the impression roll 1 typically has a maximum current leakage of 0.2 milliamperes at 4000 volts.
  • the intermediate insulating layer 6 is approximately 3 to 5 mm thick and covers the length of the core 5.
  • the semiconducting layer 7 is only moderately conductive and is approximately 8 to 13 mm thick.
  • the resistivity of the semiconducting layer is preferably approximately 2 x 107 ohm cm.
  • the impression roll may have only one layer over the core 5 or include multiple semi-conducting layers of varying conductivity as desired. Further details regarding electrostatic assist including press and ink parameters may be obtained from the "Electrostatic Assist Manual" published by Gravure Research Institute, Inc. of Port Washington, New York in 1981.
  • a web 8 transmitted between conventional delivery and take up rolls (not shown) is pressed between the impression roll 1 and the rotating gravure cylinder 2.
  • the impression roll 1 is placed in pressure contact with the gravure cylinder 2 by conventional means.
  • At the nip between the impression roll 1 and the rotating gravure cylinder 2 ink is transferred from the gravure cells of the gravure cylinder 2 to the web 8.
  • the web 8 may be a full or partial web and may be located anywhere along the width of the impression roll 1 as desired.
  • the charge coupling system designated generally by 9 includes a supporting cross member 10 that is either made of an insulating material such as phenolic, or coated with such an insulating material in such a fashion as to prevent earthing of any electrically charged part.
  • a supporting cross member 10 Pivotally mounted on the supporting cross member 10 are a plurality of electrically conducting blades 11 to 18 (see also Figures 3 and 4).
  • the blades 11 to 18 are fixed to an insulating holder 19 for example with screws.
  • the holder 19 and blades 11 to 18 are pivotally mounted to the supporting cross member 10 via a pin 20.
  • the blades are deflectable and they each include three segments of varying lengths 21, 22, and 23.
  • the segments 21 to 23 are stainless steel and are fixed to one another at the pivoting end to form a leaf-type spring.
  • each section 23 of the blades 11-18 Attached to the end of each section 23 of the blades 11-18 are respective groups of stainless steel, flexible filaments or bristles 24 which are typically 18mm long.
  • Each group of filaments is held in an aluminium holder 25.
  • the aluminium holder 25 is attached for example by rivets or screws to the free end of the corresponding segment 23 to form an electrical contact between the filaments 24 and the conducting blades 11 to 18.
  • Suitable filaments can be purchased ready mounted on an aluminium holder for example "Statstrip" produced by Kleeneze Industrial.
  • the free ends of the filaments 24 contact the surface of the impression roll 1 when the blades are in the operating position as shown in Figure 1.
  • the filaments 24 are pressed against the impression roll 1 with a slight amount of pressure by adjusting the position of the supporting cross member 10 relative to the impression roll 1 to maintain good contact with the surface of the impression roll 1 while the impression roll is rotating.
  • the filaments 24 are deflected slightly as shown in Figure 1.
  • the filaments are flexible they cause very little wear on the impression roll 1.
  • Spring loaded contacts 26 are arranged within the supporting cross-member 10 and are biassed towards engagement with the respective blades 11 to 18 when the blades are in their operating position as shown in Figure 1.
  • the member 10 includes a copper member 28 to enclose and isolate the contacts 27 from the ink vapours normally present in the nip area. The other ends of the spring loaded contacts 26 are then electrically coupled to a charging circuit via contacts 27.
  • a suitable charging circuit is described in International Patent Application WO84/03068.
  • Figure 2 illustrates the blade 11 in the non-operating position, ie. removed from electrical contact with the impression roll 1 and its respective spring loaded contact 26 by being pivoted about pivot pin 20. Since the blades 11 to 18 are individually mounted to the cross-member 10 they can be lifted away from electrical contact with the impression roll 1 at those areas where a web is not present, thereby reducing current leakage. This is useful where, as shown in Figures 3 and 4, the width of the web 8 is substantially less than the width of the impression roll 1.
  • the positioning of the blades 11 to 18 is such that any of the blades 11 to 18 which extend beyond the width of the web 8 being used may be moved out of electrical contact with the impression roll 1.
  • blades 13 to 16 are kept in the operating position so that they electrically contact via the fibres 24 the area of the impression roll 1 which directly contacts the web 8, while the blades 11, 12, 17 and 18 which would in the operating position electrically contact via the fibres 24 the area of the impression roll 1 which directly contacts the gravure cylinder 2 are moved away, by being pivoted into the disengaged position.
  • the distance or gap between each pair of the blades 11 to 18 is in the order of about 3 to 10 mm.
  • Filaments 24 are ultrafine to substantially prevent any wear occurring to the semiconducting surface 7 of the impression roll 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP88304242A 1987-05-28 1988-05-11 Tiefdruck Withdrawn EP0294042A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8712550 1987-05-28
GB878712550A GB8712550D0 (en) 1987-05-28 1987-05-28 Gravure printing

Publications (2)

Publication Number Publication Date
EP0294042A2 true EP0294042A2 (de) 1988-12-07
EP0294042A3 EP0294042A3 (de) 1989-10-11

Family

ID=10618040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88304242A Withdrawn EP0294042A3 (de) 1987-05-28 1988-05-11 Tiefdruck

Country Status (3)

Country Link
EP (1) EP0294042A3 (de)
JP (1) JPS63309442A (de)
GB (1) GB8712550D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2310632A (en) * 1996-02-27 1997-09-03 Presstech Controls Ltd Apparatus for use in a gravure printing press
WO1998003049A2 (de) * 1997-11-27 1998-01-29 Spengler Electronic Ag Elektrostatische anordnung für ein tief- und flexodruckwerk

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146385A (en) * 1960-12-09 1964-08-25 Xerox Corp Xerographic plate charging method and apparatus
DE1923226A1 (de) * 1969-05-07 1970-11-19 Fritsch Dr Ing Klaus Verfahren zur elektrostatischen Farbuebertragung in Rotationstiefdruckmaschinen
JPS5529837A (en) * 1978-08-22 1980-03-03 Nec Corp Charger
WO1984003068A1 (en) * 1983-02-07 1984-08-16 Gravure Res Inst Improved method and apparatus for direct charging of the surface of an impression roll of an electrostatic assist gravure press
EP0171239A1 (de) * 1984-07-26 1986-02-12 Nippon Paint Co., Ltd. Vorrichtung und Verfahren zur Oberflächenbehandlung
EP0180378A2 (de) * 1984-10-29 1986-05-07 Xerox Corporation Kontaktbürstenaufladung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146385A (en) * 1960-12-09 1964-08-25 Xerox Corp Xerographic plate charging method and apparatus
DE1923226A1 (de) * 1969-05-07 1970-11-19 Fritsch Dr Ing Klaus Verfahren zur elektrostatischen Farbuebertragung in Rotationstiefdruckmaschinen
JPS5529837A (en) * 1978-08-22 1980-03-03 Nec Corp Charger
WO1984003068A1 (en) * 1983-02-07 1984-08-16 Gravure Res Inst Improved method and apparatus for direct charging of the surface of an impression roll of an electrostatic assist gravure press
EP0171239A1 (de) * 1984-07-26 1986-02-12 Nippon Paint Co., Ltd. Vorrichtung und Verfahren zur Oberflächenbehandlung
EP0180378A2 (de) * 1984-10-29 1986-05-07 Xerox Corporation Kontaktbürstenaufladung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 4, no. 58 (P-9)(540) 30 April 1980, & JP-A-55 029 837 (YOSHISUKE TAKEKIDA) 3 March 1980, *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2310632A (en) * 1996-02-27 1997-09-03 Presstech Controls Ltd Apparatus for use in a gravure printing press
WO1997031777A1 (en) * 1996-02-27 1997-09-04 Presstech Controls Limited Apparatus for use in a gravure printing press
GB2310632B (en) * 1996-02-27 1998-09-09 Presstech Controls Ltd Apparatus for use in a gravure printing press
US6000333A (en) * 1996-02-27 1999-12-14 Presstech Controls Limited Apparatus for use in a gravure printing press
WO1998003049A2 (de) * 1997-11-27 1998-01-29 Spengler Electronic Ag Elektrostatische anordnung für ein tief- und flexodruckwerk
WO1998003049A3 (de) * 1997-11-27 1998-10-01 Spengler Electronic Ag Elektrostatische anordnung für ein tief- und flexodruckwerk
US6578478B2 (en) 1997-11-27 2003-06-17 Spengler Electronic Ag Electrostatic arrangement for rotogravure and flexographic printing unit

Also Published As

Publication number Publication date
GB8712550D0 (en) 1987-07-01
EP0294042A3 (de) 1989-10-11
JPS63309442A (ja) 1988-12-16

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