WO2004048094A1 - A device at a blanket cylinder - Google Patents

A device at a blanket cylinder Download PDF

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Publication number
WO2004048094A1
WO2004048094A1 PCT/SE2003/001807 SE0301807W WO2004048094A1 WO 2004048094 A1 WO2004048094 A1 WO 2004048094A1 SE 0301807 W SE0301807 W SE 0301807W WO 2004048094 A1 WO2004048094 A1 WO 2004048094A1
Authority
WO
WIPO (PCT)
Prior art keywords
blanket
rubber
blanket cylinder
gap
backing sheet
Prior art date
Application number
PCT/SE2003/001807
Other languages
French (fr)
Inventor
Birger Hansson
Original Assignee
Baldwin Jimek Ab
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 Baldwin Jimek Ab filed Critical Baldwin Jimek Ab
Priority to AU2003279688A priority Critical patent/AU2003279688A1/en
Publication of WO2004048094A1 publication Critical patent/WO2004048094A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1293—Devices for filling up the cylinder gap; Devices for removing the filler
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41F30/04—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer cylinders

Definitions

  • the present invention relates to a device at a blanket cylinder for a printing press, provided on its circumferential surface with a blanket comprising rubber on a metal backing sheet, whose rubber free end portions are adapted to be bent down and removably attached in a longitudinal slit in the blanket cylinder, leaving a longitudinal or axial gap between the rubber ends of the blanket, a separate filler being provided in the gap, substantially filling the gap.
  • one cylinder in an offset printing press is a blanket cylinder, provided on its surface with a so called blanket, normally made of rubber.
  • the blanket which has to be replaced at intervals, may be built-up of several rubber layers with different properties and may have a backing in the form of a metal sheet .
  • the total thickness of the blanket may be in the order of 2 mm, and the metal sheet may have a thickness of say 0.2 mm.
  • the blanket may be attached to the blanket cylinder in that rubber-free end portions of the metal sheet are bent down and attached in a longitudinal slit in the cylinder, leaving a longitudinal or axial gap of say 3 mm between the ends of the rubber blanket proper on the cylinder.
  • This gap will tend to be filled with paper fibres, ink residues, fountain solution and the like, a problem which is accentuated at the known use of a blanket washer with a cleaning cloth.
  • the problem is worsened because of the sharp edges of the rubber blanket and the small width of the gap.
  • the problem may be solved by a separate filler in the gap, permanently attached by an adhesive, by vulcanization or by chemical bonding.
  • FIG. 1 and 2 in side views show a certain portion of a blanket cylinder for a printing press with a blanket mounted on its surface; each Figure shows an embodiment of the present invention.
  • a portion of a blanket cylinder 1 is shown in both Figures.
  • the blanket cylinder 1 On its circumferential surface the blanket cylinder 1 is provided with a blanket, generally denoted 2.
  • the blanket 2 normally comprises rubber 3 (preferably several layers of rubber with different properties) on a metal backing sheet 4.
  • the thickness of the blanket 2 may be in the order of 2 mm, whereof the thickness of the backing sheet 4 may comprise say 0.2 mm.
  • the end portions 4' of the backing sheet 4 in the axial or longitudinal direction of the blanket cylinder 1 are free from rubber 3 and are used for removably attaching the blanket 2 to the blanket cylinder 1.
  • the end portions 4 ' are namely bent inwardly or down and pushed into an axial or longitudinal slit 5 in the blanket cylinder 1, where they may be clamped for example by means of a wedge device 1' or attached in another convenient way.
  • a longitudinal or axial gap 6 with a width of say 3 mm is left between the edges of the rubber 3 on the surface of the blanket cylinder 1.
  • This gap 6 may at use be filled with paper fibres, printing ink, fountain solution and the like, especially if a blanket washer with a cleaning cloth is utilized for cleaning purposes. This is not desirable.
  • the gap 6 may be substantially filled by a strip or gap filler 7.
  • This strip may be made of rubber, plastic or the like.
  • the strip 7 is connected to a flange 8 of thin metal or plastic material. Concurrently with the attachment of the blanket 2 by means of the metal sheet end portions 4', the flange 8 is pushed down between these portions and then clamped by means of the wedge 1'.
  • the flange 8 may alternatively be attached to the cylinder 1 in other ways .
  • FIG. 1 A second embodiment is shown in Fig 2.
  • the gap filler 7' is comprised of an integral extension of the flange 8' bent to a proper shape for substantially filling the gap 6.
  • the material of the strip shall preferably be able to withstand the effects of printing ink, fountain solution and washing liquid for a period of a year or more.
  • the upper surface of the strip shall preferably be below the initial blanket surface (by for example 0.1 mm) .

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

A blanket cylinder (1) for a printing press is provided on its circumferential surface with a blanket (2) comprising rubber (3) on a metal backing sheet (4). The rubber free end portions (4’) of this sheet (4) are adapted to be bent down and removably attached in a longitudinal slit 85) in the blanket cylinder, leaving a longitudinal or axial gap 86) between the rubber ends of the blanket. A gap-filling strip (7) is integrally connected to a flange (8) to be pushed down between the bent down metal backing sheet and portions (4’) and attached therewith in the blanket cylinder (1).

Description

A DEVICE AT A BLANKET CYLINDER
Technical Field
The present invention relates to a device at a blanket cylinder for a printing press, provided on its circumferential surface with a blanket comprising rubber on a metal backing sheet, whose rubber free end portions are adapted to be bent down and removably attached in a longitudinal slit in the blanket cylinder, leaving a longitudinal or axial gap between the rubber ends of the blanket, a separate filler being provided in the gap, substantially filling the gap.
Background of the Invention
As is well known in the printing industry, one cylinder in an offset printing press is a blanket cylinder, provided on its surface with a so called blanket, normally made of rubber.
The blanket, which has to be replaced at intervals, may be built-up of several rubber layers with different properties and may have a backing in the form of a metal sheet . The total thickness of the blanket may be in the order of 2 mm, and the metal sheet may have a thickness of say 0.2 mm.
The blanket may be attached to the blanket cylinder in that rubber-free end portions of the metal sheet are bent down and attached in a longitudinal slit in the cylinder, leaving a longitudinal or axial gap of say 3 mm between the ends of the rubber blanket proper on the cylinder. This gap will tend to be filled with paper fibres, ink residues, fountain solution and the like, a problem which is accentuated at the known use of a blanket washer with a cleaning cloth. The problem is worsened because of the sharp edges of the rubber blanket and the small width of the gap. The problem may be solved by a separate filler in the gap, permanently attached by an adhesive, by vulcanization or by chemical bonding.
The Invention Another and in many instances more convenient solution is according to the invention attained in that the filler is integrally connected to a flange to be pushed down between the bent down metal backing sheet end portions and attached therewith in the blanket cylinder. Embodiments are covered by dependent claims.
Brief Description of the Drawing
The invention will be described in further detail below under reference to the accompanying drawing, in which Figs 1 and 2 in side views show a certain portion of a blanket cylinder for a printing press with a blanket mounted on its surface; each Figure shows an embodiment of the present invention.
Detailed Description of Preferred Embodiments
A portion of a blanket cylinder 1 is shown in both Figures. On its circumferential surface the blanket cylinder 1 is provided with a blanket, generally denoted 2. The blanket 2 normally comprises rubber 3 (preferably several layers of rubber with different properties) on a metal backing sheet 4. The thickness of the blanket 2 may be in the order of 2 mm, whereof the thickness of the backing sheet 4 may comprise say 0.2 mm.
The end portions 4' of the backing sheet 4 in the axial or longitudinal direction of the blanket cylinder 1 are free from rubber 3 and are used for removably attaching the blanket 2 to the blanket cylinder 1. The end portions 4 ' are namely bent inwardly or down and pushed into an axial or longitudinal slit 5 in the blanket cylinder 1, where they may be clamped for example by means of a wedge device 1' or attached in another convenient way. Hereby a longitudinal or axial gap 6 with a width of say 3 mm is left between the edges of the rubber 3 on the surface of the blanket cylinder 1. This gap 6 may at use be filled with paper fibres, printing ink, fountain solution and the like, especially if a blanket washer with a cleaning cloth is utilized for cleaning purposes. This is not desirable.
As shown in Fig 1, the gap 6 may be substantially filled by a strip or gap filler 7. This strip may be made of rubber, plastic or the like. The strip 7 is connected to a flange 8 of thin metal or plastic material. Concurrently with the attachment of the blanket 2 by means of the metal sheet end portions 4', the flange 8 is pushed down between these portions and then clamped by means of the wedge 1'. The flange 8 may alternatively be attached to the cylinder 1 in other ways .
A second embodiment is shown in Fig 2. Here the gap filler 7' is comprised of an integral extension of the flange 8' bent to a proper shape for substantially filling the gap 6.
The material of the strip shall preferably be able to withstand the effects of printing ink, fountain solution and washing liquid for a period of a year or more.
As the rubber material of the blanket is slightly compressible and subjected to wear, the upper surface of the strip shall preferably be below the initial blanket surface (by for example 0.1 mm) .

Claims

1. A device at a blanket cylinder (1) for a printing press, provided on its circumferential surface with a blanket (2) comprising rubber (3) on a metal backing sheet (4), whose rubber free end portions (4') are adapted to be bent down and removably attached in a longitudinal slit (5) in the blanket cylinder, leaving a longitudinal or axial gap (6) between the rubber ends of the blanket (1) , a separate filler (7?7#) being provided in the gap (6), substantially filling the gap, c h a r a c t e r i z e d in that the filler (7; 7') is integrally connected to a flange (8; 8') to be pushed down between the bent -down metal backing sheet end portions (4') and attached therewith in the blanket cylinder (1) .
2. A device according to claim 1, wherein the filler is a strip (7) of rubber, plastic or metal, attached in the gap (6) .
3. A device according to claim 1, wherein the filler is comprised of an integral extension ( 7 " ) of the flange
(8') .
4. A device according to claim 2 or 3 , wherein the metal backing sheet end portions (4') and the flange (8; 8') are clamped to the blanket cylinder (1) by a wedge device (1') .
PCT/SE2003/001807 2002-11-25 2003-11-21 A device at a blanket cylinder WO2004048094A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003279688A AU2003279688A1 (en) 2002-11-25 2003-11-21 A device at a blanket cylinder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0203474A SE524246C2 (en) 2002-11-25 2002-11-25 Device on a cloth cylinder
SE0203474-2 2002-11-25

Publications (1)

Publication Number Publication Date
WO2004048094A1 true WO2004048094A1 (en) 2004-06-10

Family

ID=20289661

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2003/001807 WO2004048094A1 (en) 2002-11-25 2003-11-21 A device at a blanket cylinder

Country Status (3)

Country Link
AU (1) AU2003279688A1 (en)
SE (1) SE524246C2 (en)
WO (1) WO2004048094A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1712360A2 (en) * 2005-04-14 2006-10-18 MAN Roland Druckmaschinen AG Printing machine Ink transfer device
ITMI20081929A1 (en) * 2008-11-03 2010-05-04 Trelleborg Engineered Systems Italy S P A ELEMENT WITH APPENDIX FOR THE OCCLUSION OF A GAP OF A TYPOGRAPHIC CYLINDER AND TYPOGRAPHIC CYLINDER OBTAINED
ITMI20081931A1 (en) * 2008-11-03 2010-05-04 Trelleborg Engineered Systems Italy S P A COMPLEMENTARY ELEMENT OF A CLADDING FOR A TYPOGRAPHIC CYLINDER, A TYPOGRAPHIC CYLINDER SO OBTAINED, AND A METHOD OF APPLICATION TO THE TYPOGRAPHIC CYLINDER
WO2010061413A1 (en) * 2008-11-03 2010-06-03 Trelleborg Engineered Systems Italy S.P.A. Finishing element of a coating for a typographic cylinder and manufacturing and finishing method thereof, coating of a typographic cylinder and manufacturing method thereof, typographic cylinder comprising such a coating, and method of application of such a coating to the typographic cylinder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3512776A1 (en) * 1985-04-10 1986-10-16 Wolfgang 6450 Hanau Postel Impression cylinder
US5125337A (en) * 1990-02-22 1992-06-30 Man Roland Druckmaschinen Ag Printing cylinder groove filler
US5351615A (en) * 1992-05-29 1994-10-04 Man Roland Druckmaschinen Ag Offset blanket for a grooveless blanket cylinder composed of a carrier plate and a rubber layer placed thereon
US5357863A (en) * 1991-11-15 1994-10-25 Day International, Inc. Printing blanket for use with a printing cylinder to achieve a narrow gap lock-up
US5749298A (en) * 1997-06-10 1998-05-12 Reeves Brothers, Inc. Arrangement for securing a printing blanket to a cylinder
US6286427B1 (en) * 1995-05-10 2001-09-11 Duco International Limited Adaptor fillet for printing press cylinder and method of using

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3512776A1 (en) * 1985-04-10 1986-10-16 Wolfgang 6450 Hanau Postel Impression cylinder
US5125337A (en) * 1990-02-22 1992-06-30 Man Roland Druckmaschinen Ag Printing cylinder groove filler
US5357863A (en) * 1991-11-15 1994-10-25 Day International, Inc. Printing blanket for use with a printing cylinder to achieve a narrow gap lock-up
US5351615A (en) * 1992-05-29 1994-10-04 Man Roland Druckmaschinen Ag Offset blanket for a grooveless blanket cylinder composed of a carrier plate and a rubber layer placed thereon
US6286427B1 (en) * 1995-05-10 2001-09-11 Duco International Limited Adaptor fillet for printing press cylinder and method of using
US5749298A (en) * 1997-06-10 1998-05-12 Reeves Brothers, Inc. Arrangement for securing a printing blanket to a cylinder

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1712360A2 (en) * 2005-04-14 2006-10-18 MAN Roland Druckmaschinen AG Printing machine Ink transfer device
EP1712360A3 (en) * 2005-04-14 2010-05-05 manroland AG Printing machine Ink transfer device
ITMI20081929A1 (en) * 2008-11-03 2010-05-04 Trelleborg Engineered Systems Italy S P A ELEMENT WITH APPENDIX FOR THE OCCLUSION OF A GAP OF A TYPOGRAPHIC CYLINDER AND TYPOGRAPHIC CYLINDER OBTAINED
ITMI20081931A1 (en) * 2008-11-03 2010-05-04 Trelleborg Engineered Systems Italy S P A COMPLEMENTARY ELEMENT OF A CLADDING FOR A TYPOGRAPHIC CYLINDER, A TYPOGRAPHIC CYLINDER SO OBTAINED, AND A METHOD OF APPLICATION TO THE TYPOGRAPHIC CYLINDER
WO2010061413A1 (en) * 2008-11-03 2010-06-03 Trelleborg Engineered Systems Italy S.P.A. Finishing element of a coating for a typographic cylinder and manufacturing and finishing method thereof, coating of a typographic cylinder and manufacturing method thereof, typographic cylinder comprising such a coating, and method of application of such a coating to the typographic cylinder
CN102245388A (en) * 2008-11-03 2011-11-16 特瑞堡工程系统意大利股份公司 Finishing element of a coating for a typographic cylinder and manufacturing and finishing method thereof, coating of a typographic cylinder and manufacturing method thereof, typographic cylinder comprising such a coating, and method of application of

Also Published As

Publication number Publication date
SE0203474D0 (en) 2002-11-25
SE0203474L (en) 2004-05-26
AU2003279688A1 (en) 2004-06-18
SE524246C2 (en) 2004-07-13

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