EP1279496A1 - Offsetpresse mit Lagermontage - Google Patents

Offsetpresse mit Lagermontage Download PDF

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Publication number
EP1279496A1
EP1279496A1 EP02291851A EP02291851A EP1279496A1 EP 1279496 A1 EP1279496 A1 EP 1279496A1 EP 02291851 A EP02291851 A EP 02291851A EP 02291851 A EP02291851 A EP 02291851A EP 1279496 A1 EP1279496 A1 EP 1279496A1
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EP
European Patent Office
Prior art keywords
cylinder
bearing
axis
frame
relative
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
EP02291851A
Other languages
English (en)
French (fr)
Other versions
EP1279496B1 (de
Inventor
Michel 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.)
Goss International France SAS
Original Assignee
Goss Systemes Graphiques Nantes SAS
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.)
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Publication date
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Application filed by Goss Systemes Graphiques Nantes SAS filed Critical Goss Systemes Graphiques Nantes SAS
Publication of EP1279496A1 publication Critical patent/EP1279496A1/de
Application granted granted Critical
Publication of EP1279496B1 publication Critical patent/EP1279496B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/26—Arrangement of cylinder bearings
    • B41F13/28—Bearings mounted eccentrically of the cylinder axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders

Definitions

  • the present invention relates to an offset press of the type comprising a frame, at least one plate cylinder, a pressure cylinder and a blanket cylinder interposed between the plate and pressure cylinders, and bearings carried by the frame and receiving the longitudinal ends of the cylinders so that each cylinder can rotate relative to the frame around a respective longitudinal central axis.
  • each end of the cylinder is mounted by means of a rotary bearing on the frame.
  • Drive means ensure the rotation of the cylinders.
  • the plate carried by the plate cylinder is moistened and then inked.
  • the plate transfers the ink from its printing regions onto the blanket carried by the blanket cylinder.
  • the blanket then transfers the ink onto the printing paper which passes between the blanket cylinder and the pressure cylinder.
  • the plate, blanket and pressure cylinders To be able to transfer the ink on the one hand from the plate to the blanket, and on the other hand from the blanket to the paper, the plate, blanket and pressure cylinders must, in operation, be tackled against each other. The cylinders then exert on each other radial bending forces.
  • the diameters of the cylinders of a press of the aforementioned type are relatively large, which induces a large mass and relatively high production and installation costs.
  • An object of the invention is to solve these problems by providing a press of the aforementioned type which makes it possible to reduce the diameter of at least one cylinder and thus the costs associated with this press.
  • the subject of the invention is an offset press of the aforementioned type, characterized in that the longitudinal ends of at least one first cylinder are each received in a first bearing and a second bearing, the second bearing being spaced from the first bearing along the longitudinal axis of the first cylinder.
  • an offset press 1 which essentially comprises a frame 2, a plate cylinder 3, a blanket cylinder 4 and a pressure cylinder 5.
  • the blanket 4 and pressure 5 cylinders have identical diameters double that of the plate cylinder 3.
  • the frame 2 essentially comprises two lateral uprights 6 in the form of vertical panels and only one of which is visible in FIG. 1. These uprights 6 are arranged on either side of the cylinders 3 to 5.
  • the cylinders 3 to 5 are rotatably mounted by each of their ends on the uprights 6, as will be described later, in order to be able to rotate each around a respective longitudinal central axis A3, A4 and A5.
  • each longitudinal end 31 of the plate cylinder 3 is rotatably mounted on the corresponding upright 6 by means of a first bearing 32 laterally on the outside and of a second bearing 33 laterally inside.
  • the press 1 being substantially symmetrical with respect to a median vertical plane, only the connection of one end 31 to the frame 2 will be described later.
  • the bearings 32 and 33 are spaced from each other by a non-zero distance d along the longitudinal axis A3 of the plate cylinder 3.
  • the bearings 32 and 33 each comprise a bearing 34.
  • the bearing 34 of the bearing 32 is supported on a first region 35 of the end 31 considered.
  • the bearing 34 of the bearing 33 is supported on a second region 36 of the end 31 considered.
  • the bearings 34 have central geometric axes which constitute those of the bearings 32 and 33 respectively. These axes, which are tangent to the axis A3 in regions 35 and 36, will be referenced A32 and A33.
  • the second bearing 33 comprises a sheath 331 flanged by a laterally external flange 332 at the corresponding upright 6.
  • the second bearing 33 is therefore fixed relative to the frame 2.
  • a stepped bore 333 is formed in the sleeve 331.
  • This bore 333 comprises a laterally inner section 334 centered on the axis A3, an intermediate section 335 also centered on the axis A3 but of smaller diameter than the section 334, and a laterally outer section 336 of larger diameter than the section intermediate 335 and offset from the A3 axis.
  • the section 336 is centered on an axis P3 situated in the same vertical plane as the axis A3 above the latter. Typically, the distance separating the axis A3 and the axis P3 is 3 mm.
  • the bearing 34 of the second bearing 33 is arranged in the inner section 334 of the bore 333.
  • the first bearing 32 comprises a movable support 321.
  • the support 321 has the general shape of a circular flat plate centered on the axis P3 and extended upwards by a drive arm 322.
  • a circular bore 323 is formed in the support 321. This bore 323 is eccentric relative to the axis P3, the center of the bore 323 being located substantially opposite the axis P3 relative to the arm 322.
  • the support 321 is extended laterally inwards by a sleeve 324 received in the laterally outer section 336 of the bore 333 of the sleeve 331, so that the support 321 can pivot in the sleeve 331 around the axis P3.
  • the bearing 34 of the first bearing 32 is received in the bore 323 of the support 321.
  • the bearing 32 is therefore pivotable relative to the frame 2.
  • the offset press 1 further comprises for each end 31 of the plate cylinder 3 an adjustable displacement cylinder 37 connected by a first end to the corresponding upright 6 and by the other end to the arm 322 of the support 321 of the first bearing 32.
  • the jack 37 is typically a pneumatic jack.
  • This jack 37 makes it possible to move the support 321, and therefore the first bearing 32, between two positions illustrated respectively in FIGS. 1 to 3 and in FIG. 4.
  • the first bearing 32 therefore has zero offset relative to the second bearing A33.
  • the longitudinal axis A3 of the plate cylinder 3 is therefore straight and the plate cylinder 3 is not subjected to any bending stress.
  • the axis A32 of the first bearing 32 has pivoted around the axis P3 and is therefore no longer coincident with the axis A33 of the second bearing 33.
  • the axis A32 is then offset radially relative to the axis A33 substantially in the direction and in the direction of the bending force F exerted by the blanket cylinder 4 on the plate cylinder 3 when the press 1 is operating.
  • the longitudinal axis A3 of the plate cylinder 3 is then bent to be tangent to the axes A32 and A33 in the corresponding regions 35 and 36 of the ends 31 of the cylinder 3.
  • the plate cylinder 3 is prestressed in bending opposite to the force F.
  • the first and second positions of the bearing 32 are end positions.
  • each longitudinal end 41 of the blanket cylinder 4 is mounted, as in the prior art, on the corresponding upright 6 by virtue of a single bearing 42 movable relative to the upright 6.
  • This bearing 42 has a structure similar to that of a bearing 32 and thus comprises a support 421 pivotally mounted on the corresponding upright 6 around an axis P4.
  • the support 421 is extended by a drive arm 422.
  • the support 421 has a bore 423 of axis A42 eccentric with respect to the axis P4 and receiving the end 41 considered of the blanket cylinder 4.
  • An adjustable cylinder of displacement 47 is connected to the upright 6 and to the arm 422 to drive the support 421 in rotation about the axis P4 and therefore move the axis A4 of the cylinder 4 to bring it closer or away from the plate cylinder 3.
  • Each longitudinal end 51 of the pressure cylinder 5 is mounted, as in the prior art, on the corresponding upright 6 by virtue of a single bearing 52 movable relative to the upright 6.
  • This bearing 52 has a structure similar to that of a bearing 32 and thus comprises a support 521 pivotally mounted on the corresponding upright about an axis P5.
  • the support 521 is extended by a drive arm 522.
  • the support 521 has a bore 523 of axis A52 eccentric with respect to the axis P5 and receiving the end 51 considered of the pressure cylinder 5.
  • An adjustable displacement cylinder 57 is connected to the upright 6 and to the arm 522 to drive the support 521 in rotation about the axis P5 and therefore move the axis A5 of the cylinder 5 to bring it closer or away from the blanket cylinder 4.
  • the press 1 comprises conventional means, not shown, for driving the cylinders 3 to 5 in rotation about their axes A3 to A5.
  • the respective longitudinal axes A4 and A5 of the cylinders 4 and 5 are moved, thanks to the movable bearings 42 and 52, in order to position them relative to the axis A3 in a manner allowing satisfactory transfer of the ink from the plate carried by the cylinder 3 towards the blanket carried by the cylinder 4 and towards the paper to be printed passing between the cylinders 4 and 5.
  • the first bearings 32 of the plate cylinder 3 Prior to this positioning, the first bearings 32 of the plate cylinder 3 have been moved from their first position to their second position or to an intermediate position under the action of the jacks 37.
  • the cylinder 3 is then bent as described above.
  • the bending force F applied by the blanket cylinder 4 on the plate cylinder 3 is compensated by the prestressing of the plate cylinder 3 created by the eccentricity of the first bearings 32 relative to the second bearings 33.
  • the overall deformation of the cylinder 3 when the offset press 1 is operating measured for example by the deflection of the deformation of the cylinder 3, is particularly small.
  • the diameter of the cylinder 3, and therefore its mass and associated costs, are reduced.
  • the preload applied to the cylinder 3 can be fixed at an acceptable value by placing the bearings 32 in intermediate positions between their first and second positions.
  • the first of this characteristic can be used alone to limit the flexing of the plate cylinder 3.
  • each of the cylinders 3, 4 and 5 of the offset press 1 can be applied separately or not to each of the cylinders 3, 4 and 5 of the offset press 1 to reduce their respective diameters, although they are of particular interest for the plate cylinder 3 since they avoid the problems associated with mounting large plates or simultaneously mounting two plates.
  • the diameters of cylinders 4 and 5 can also be reduced independently or not of that of cylinder 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Paper (AREA)
  • Soil Working Implements (AREA)
EP02291851A 2001-07-23 2002-07-22 Offsetpresse mit verbesserter Zylindermontage Revoked EP1279496B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0109815 2001-07-23
FR0109815A FR2827544B1 (fr) 2001-07-23 2001-07-23 Presse offset a montage de cylindre ameliore

Publications (2)

Publication Number Publication Date
EP1279496A1 true EP1279496A1 (de) 2003-01-29
EP1279496B1 EP1279496B1 (de) 2009-08-19

Family

ID=8865810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02291851A Revoked EP1279496B1 (de) 2001-07-23 2002-07-22 Offsetpresse mit verbesserter Zylindermontage

Country Status (5)

Country Link
US (1) US6834580B2 (de)
EP (1) EP1279496B1 (de)
AT (1) ATE439982T1 (de)
DE (1) DE60233370D1 (de)
FR (1) FR2827544B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2889822B1 (fr) * 2005-08-19 2007-11-09 Goss Int Montataire Sa Unite d'impression a cylindre porte-blanchet mobile entre une position en-pression et une position hors-pression et presse d'impression correspondante.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686502A2 (de) * 1994-06-10 1995-12-13 Maschinenfabrik Wifag Vorrichtung zum Reduzieren der Zylinderdurchbiegung in Rotationsdruckmaschinen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732813A (en) * 1972-01-03 1973-05-15 Rockwell International Corp Bearer arrangement for printing press
US4200045A (en) * 1975-02-27 1980-04-29 Oy Wartsila Ab Loading arrangement for a cylinder stack
DD141649A1 (de) * 1979-03-26 1980-05-14 Tappert Hans Juergen Einrichtung zur druckpressungsregelung an druckmaschinen
US5813336A (en) * 1995-12-22 1998-09-29 Heidelberger Druckmaschinen Ag Printing unit with axially removable printing sleeves
US5746132A (en) * 1996-09-24 1998-05-05 Mark Andy, Inc. Variable repeat plate and blanket cylinder mechanism
DE59804990D1 (de) * 1998-03-16 2002-09-05 Grapha Holding Ag Druckwerk für eine Druckmaschine, insbesondere Offset-Rotationsmaschine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686502A2 (de) * 1994-06-10 1995-12-13 Maschinenfabrik Wifag Vorrichtung zum Reduzieren der Zylinderdurchbiegung in Rotationsdruckmaschinen

Also Published As

Publication number Publication date
ATE439982T1 (de) 2009-09-15
US6834580B2 (en) 2004-12-28
FR2827544B1 (fr) 2003-10-17
FR2827544A1 (fr) 2003-01-24
EP1279496B1 (de) 2009-08-19
DE60233370D1 (de) 2009-10-01
US20030024420A1 (en) 2003-02-06

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