EP0686503B1 - Dispositif d'accrochage de clichés flexibles sur un cylindre d'impression - Google Patents

Dispositif d'accrochage de clichés flexibles sur un cylindre d'impression Download PDF

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Publication number
EP0686503B1
EP0686503B1 EP95108586A EP95108586A EP0686503B1 EP 0686503 B1 EP0686503 B1 EP 0686503B1 EP 95108586 A EP95108586 A EP 95108586A EP 95108586 A EP95108586 A EP 95108586A EP 0686503 B1 EP0686503 B1 EP 0686503B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
groove
fact
grooves
printing
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.)
Expired - Lifetime
Application number
EP95108586A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0686503A1 (fr
Inventor
Bernard Capdeboscq
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.)
Martin SA
Original Assignee
Martin SA
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 Martin SA filed Critical Martin SA
Publication of EP0686503A1 publication Critical patent/EP0686503A1/fr
Application granted granted Critical
Publication of EP0686503B1 publication Critical patent/EP0686503B1/fr
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
    • 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
    • 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
    • B41F27/1212—Devices for attaching printing elements or formes to supports for attaching flexible printing formes using pneumatic force

Definitions

  • the present invention relates to a device for hanging flexible plates on a printing cylinder in a rotary printing machine.
  • flexo printing machines In such machines, generally called flexo printing machines and frequently used in the cardboard industry, flexible plates are mounted on a rotating cylinder to transfer the ink onto the surface to be printed. These machines pass successively individual sheets of cardboard taken from the top of a stack through a printing station, possibly through a cutting station before arriving at a receiving station.
  • a major problem with such machines is the changing of plates on the printing cylinders, and more particularly the rapid mounting of printing plates so as not to unnecessarily delay the machine when changing a format of sheet or print format.
  • a printing plate usually comprises one or more forms of rubber or plastic printing fixed on a flexible support sheet, either of thick paper or of rubberized or plastic material, so that it can be wound around the cylinder. impression.
  • One of the first known means for attaching a plate to a cylinder consists in stapling the sheet onto a piece of wood belonging to the cylinder.
  • these staples tend, over time, to damage the backing sheet and the piece of wood. which must then be replaced regularly.
  • the photograph is in a bad position, it must be completely removed and repositioned, which can double or triple the dead time.
  • Another attachment device comprises a rigid strip at each upstream and downstream end of the plate.
  • the upstream strip is engaged in a fixed groove of the cylinder while the downstream strip is taken in an articulated groove so as to be able to put this photograph under tension.
  • the dimensions of the plate must then be fairly precise and there are also problems with the means of implementing the movable groove.
  • the real problem is to maintain the whole of the plate pressed against the cylinder, which does not necessarily imply a strong tensioning of this plate.
  • the attachment device described in document FR 2 196 910 comprises two parallel side-by-side grooves formed substantially tangentially along a generatrix of the cylinder. Each groove opens on their opposite side so that one of them receives the front edge of the plate, the other receiving the downstream edge. These plate edges are held in place by means of bolts passing radially through the grooves and engaging in threaded holes in the cylinder. This device is however imperfect in that the edges are only positioned or maintained at two or three points. In addition, the insertion of the edges in the grooves can be done more or less easily depending on the thickness of the support sheet.
  • the attachment device described in the document FR 2 434 035 is based on the presence of protruding fixing pins of the cylinder and in which openings are made a little behind the front and downstream edges of the plate. A plate is then added between these pins to keep the edges pressed against the cylinders. Again, the accuracy of the positioning of the front edge cannot be guaranteed by simply maintaining it in a few points.
  • the Matthews device comprises a hook band of U-shaped transverse shape fixed to one end of the plate, this band coming to hang in a groove in correspondence of the printing cylinder also having a transverse U-shape.
  • a plurality of elastic tensioners are attached to the other end of the plate. Each of these tensioners can end with a U-shaped hook which can be engaged in another groove of the cylinder also having a transverse U-shape.
  • the object of the present invention is a device for hanging plates comprising a front band of substantially U-shaped cross section coming to engage in a hook-groove formed along a generatrix of the cylinder; as well as means for fixing and tensioning the downstream edge of the plate, which is such that a detachment of the front edge of the plate is practically impossible on the occasion of a relaxation of the tension of the means of fixing the downstream edge .
  • This device must however always remain as simple to handle and be achievable without excessive cost.
  • This goal is achieved by one or more tabs attached against the face of the sheet of the plate and oriented towards the cylinder side, set back from the front hook-strip, these tabs being positioned in an additional groove of transverse profile corresponding to the profile. cleats and formed, in correspondence, parallel and close to the first hook-groove.
  • the hook-strip can only be disengaged from its groove if the tabs have themselves previously come out of their own groove, which supposes that the support sheet of the plate has been lifted well beyond the plane tangential to the cylinder passing through the hooking device.
  • a simple relaxation of the sheet tension causes only a few beats in the rear part of the plate but very rarely a lifting of the upstream part. Then, the cleats remaining in place also maintain the hook band.
  • the lug groove is connected by a plurality of radial channels to an internal chamber of the cylinder which can be placed under vacuum.
  • the plate preferably comprises at least one cleat in each of its lateral edges.
  • the lateral tabs delimit between them an area in the groove capable of supporting a vacuum, which confirms that these tabs are held in place.
  • the cleat groove is completed by a plurality of transverse grooves in an arc.
  • the cleat groove is connected to a series of parallel circular grooves formed around the entire periphery of the external face of the cylinder. This arrangement makes it possible to keep the front part of the plate particularly well pressed against the level of the cleat groove.
  • the cleat groove consists of a plurality of grooves placed end-to-end and not communicating with each other. Each groove can optionally communicate with several complementary transverse grooves. In this embodiment, a cleat, generally central, occupies one of the grooves. It is thus possible to overcome the lateral tabs which facilitates the lateral positioning of the plate.
  • a separation is preferably installed allowing these grooves to be divided into two parts: an upstream and a downstream and independently connected to the internal vacuum chamber. This embodiment makes it possible to install shorter photographs stopping at the level of the separation.
  • the sheet exceeds the separation, it is then slightly folded or embossed at its downstream edge to form a transverse cavity making it possible to increase the surface in depression, therefore the plating force.
  • a thin strip can be glued to the downstream edge of the plate.
  • a plurality of transverse grooves can be cut on the upstream side of the partition.
  • the transverse shape of the grooves is narrower at its mouth on the surface of the cylinder than at its bottom in the thickness of the cylinder.
  • a groove may have a trapezoidal transverse shape whose bottom has a width of between 6 mm and 8 mm while the opening is reduced between 1 mm and 3 mm, preferably 2 mm.
  • Such grooves ensure good maintenance of plates whose support sheets are thin.
  • the circulation of the depression is done with less pressure drop from one end to the other of the groove while limiting the leakage section for an uncovered part.
  • a plate 1 consists of a thin and flexible support sheet 2 of rubber or plastic, on the external face of which are stuck printing patterns 18.
  • the front edge of the sheet is equipped of a wide hook-strip 3, the front edge of which has, seen in cross section, a U-shape.
  • the downstream edge of the sheet 2 is arranged to receive either elastic tensioners 12 or a strip disposable adhesive 13 of adhesive tape type.
  • the plate comprises, in its front part, a plurality of tabs 4 glued to the "cylinder side" face and close to the hook-strip 3.
  • the cylinder 7 comprises on the one hand a hook-bar forming a groove 6 in L provided to receive the hook-strip 3 of the plate 1.
  • This bar is in fact fixed in the middle of a sufficiently wide longitudinal recess so as to leave free, on the rear side, a complementary groove 5 provided for the cleats 4 of the plates 1.
  • the positioning of the plate 1 is carried out by engaging the hook band 3 in the groove 6 formed by the bar.
  • the fact of subsequently winding the plate on the cylinder engages the tabs 4 in the groove 5.
  • a relaxation of the tension can no longer cause the stall due to the security provided by the cleats.
  • the groove 5 communicates by a radial channel 8 with the internal chamber of the cylinder 7 which, as illustrated in FIG. 5, can be put under vacuum by a vacuum pump 9 connected to the cylinder by a rotating joint 10.
  • the plating force pressing the front edge of the plate 1 against the cylinder can be increased by arranging grooves 11 in an arc of a circle in the external surface of the cylinder 7, these grooves being in communication at right angles to the lug groove 5.
  • the positioning of the lugs in the center and on each side of the front edge does not in any way compromise the communication between the circular grooves 11, the lug groove 5, and the channels 8.
  • the groove 5 consists of a plurality of individual grooves 14 placed end-to-end as illustrated in FIG. 8.
  • Each groove 14 communicates, on the one hand, with several grooves 11 and, d 'other hand, with a radial channel 8 of depression.
  • only a single cleat 4 is provided, generally in the middle, within one of the individual grooves 14, which facilitates the adjustment of the lateral position of the plate.
  • FIG. 6 illustrates a separation 16 dividing the grooves 11 into two distinct zones, the front part of a groove being supplied by the radial channels 8, the downstream part then being supplied by radial channels 15 opening into grooves 14. Then, if the dimensions of the plate are such that the downstream edge of the sheet 2 comes to cover the grooves 14, the depression can propagate until the separation 16 acting as a partition.
  • the plate is shorter to the point of stopping only at the level of the partition 16, provision is made for a fold or embossing at its downstream edge to form a transverse cavity 17 facilitating equalization of the depression of a groove with the other allowing to notably increase the surface on which the atmospheric pressure is applied.
  • This surface leveling can also be obtained by gluing a thin strip 19 under the downstream edge of the plate or, alternatively, by making fine transverse grooves 20 near the partition 16 as illustrated in FIG. 9.
  • peripheral grooves formed on the surface of the cylinder described in documents FR 2 434 035 or FR 2 196 910 usually have a width of the order of 7 mm for a depth of 3 mm to 4 mm.
  • the support sheets 2 of plate 1 are not properly supported when they are thin, which is the case with the majority of existing plates. It is then necessary to use thick support sheets therefore more rigid, which increases the costs and the difficulty of handling.
  • the grooves 11 associated with the attachment device according to the invention have a very narrow transverse shape at the mouth, of the order of 2 mm and 3 to 4 times wider at its bottom, c that is to say within the thickness of the cylinder 7. Then, the penetration of the flexible support sheet 2 is practically 80 times less than before. In other words, for a even permissible insertion of the sheet, it may be 3 times thinner than before.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
EP95108586A 1994-06-08 1995-06-06 Dispositif d'accrochage de clichés flexibles sur un cylindre d'impression Expired - Lifetime EP0686503B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9407200 1994-06-08
FR9407200A FR2720975B1 (fr) 1994-06-08 1994-06-08 Dispositif d'accrochage de clichés flexibles sur un cylindre d'impression.

Publications (2)

Publication Number Publication Date
EP0686503A1 EP0686503A1 (fr) 1995-12-13
EP0686503B1 true EP0686503B1 (fr) 1997-11-05

Family

ID=9464146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95108586A Expired - Lifetime EP0686503B1 (fr) 1994-06-08 1995-06-06 Dispositif d'accrochage de clichés flexibles sur un cylindre d'impression

Country Status (8)

Country Link
US (1) US5526746A (ko)
EP (1) EP0686503B1 (ko)
KR (1) KR0183189B1 (ko)
AU (1) AU687184B2 (ko)
BR (1) BR9502711A (ko)
DE (1) DE69500974T2 (ko)
ES (1) ES2109753T3 (ko)
FR (1) FR2720975B1 (ko)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2952752B2 (ja) * 1995-11-17 1999-09-27 株式会社東京機械製作所 刷版の版胴への固定および版胴からの解離装置
US5813336A (en) * 1995-12-22 1998-09-29 Heidelberger Druckmaschinen Ag Printing unit with axially removable printing sleeves
US5687647A (en) * 1996-04-26 1997-11-18 Heidelberger Druckmaschinen Ag Plate cylinder with fixed tensioning plate mounting device
DE19636412C1 (de) * 1996-09-07 1998-01-08 Koenig & Bauer Albert Ag Zylinder
US6058838A (en) * 1997-04-16 2000-05-09 Hirakawa Kogyo Sha Co., Ltd. Machine plate fastening means, plate cylinder fitted with said fastening means, and offset printing machine equipped with said plate cylinder
JP2981453B2 (ja) * 1997-10-21 1999-11-22 株式会社平河工業社 オフセット印刷機用刷版係止具及びそれを取り付けるためのアングル
US6267054B1 (en) * 1999-03-12 2001-07-31 Creo Products Inc. Retaining apparatus and method for holding printing plates on a vacuum drum
US6295929B1 (en) * 2000-02-25 2001-10-02 Agfa Corporation External drum imaging system
US7255042B2 (en) * 2001-01-25 2007-08-14 Fujifilm Corporation Recording apparatus and method of foreign material removal thereof
ATE478361T1 (de) 2001-05-11 2010-09-15 Dainippon Screen Mfg Abtastgerät für eine zylindrische aussenfläche
JP3885668B2 (ja) * 2002-06-12 2007-02-21 コニカミノルタホールディングス株式会社 平版印刷版材料および平版印刷版材料の固定方法
US20120192743A1 (en) * 2011-01-31 2012-08-02 Printing Research, Inc. Reversible Anti-marking Jackets and Method of Using
US9346258B2 (en) 2012-05-02 2016-05-24 Printing Research, Inc. Method for cleaning anti-marking jackets
FR3000429B1 (fr) 2012-12-28 2017-02-10 Bobst Lyon Module d’impression pour imprimer a partir de cliches sur des elements en plaque et machine de transformation comprenant un tel module d’impression
CN114030289B (zh) * 2021-11-05 2023-04-18 江苏富台机械科技有限公司 一种水性印刷机多用挂版机构

Family Cites Families (17)

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Publication number Priority date Publication date Assignee Title
GB340223A (en) * 1929-09-21 1930-12-22 John Eskdale Fishburn Improvements in or relating to printing surfaces
US1923925A (en) * 1931-01-14 1933-08-22 Goss Printing Press Co Ltd Printing press
FR993798A (fr) * 1949-08-26 1951-11-07 Mitchell S Imp S R L Perfectionnements aux cylindres de presses rotatives portant des feuilles gravées
GB752300A (en) * 1953-09-03 1956-07-11 Schnellpressenfab Heidelberg Improvements in or relating to the pre-registering of type matter, blocks or plates and the like for flat and curved printing formes
GB1348588A (en) * 1971-11-18 1974-03-20 Matthews Co Jas H Fastening device for flexible printing plates
DE2241703A1 (de) 1972-08-24 1974-02-28 Juergen Schulz Verfahren und vorrichtung zum aufspannen von druckformen auf ihrem traeger
US4005653A (en) * 1974-09-09 1977-02-01 Livermore And Knight Co., Inc. Vacuum cylinder for printing presses
SE7808789L (sv) 1978-08-21 1980-02-22 Tetra Pak Int Festanordning vid vakuumtryckvals
SU971674A1 (ru) * 1980-07-14 1982-11-07 за вители Устройство дл ориентации и фиксации плат печатного монтажа
DE3102126C2 (de) * 1981-01-23 1983-12-15 Loewe Opta Gmbh, 8640 Kronach Drucktisch für eine Siebdruckmaschine
CA1215412A (en) * 1981-07-29 1986-12-16 Klaus-Peter Schoen Suction device for holding plates
US4744297A (en) * 1985-09-17 1988-05-17 The Ward Machinery Company Mounting printing plates
US4683822A (en) * 1985-09-17 1987-08-04 The Ward Machinery Company Die mounting apparatus
US5103729A (en) * 1990-09-21 1992-04-14 Matthews International Inc. Apparatus for securing a printing plate to a printing plate cylinder and a printing plate composite utilizing such apparatus
DE4126643A1 (de) * 1991-08-12 1993-02-18 Koenig & Bauer Ag Trommel zum transportieren und uebergeben von bogen
NO175046B (no) * 1992-04-09 1994-05-16 Grafia As Anordning for å bringe klisjeer i register ved montering på klisjesylindere
US5402721A (en) * 1993-05-13 1995-04-04 Comco Machinery, Inc. Vacuum printing plate roller

Also Published As

Publication number Publication date
DE69500974D1 (de) 1997-12-11
KR0183189B1 (ko) 1999-05-15
EP0686503A1 (fr) 1995-12-13
AU2160595A (en) 1995-12-14
AU687184B2 (en) 1998-02-19
FR2720975A1 (fr) 1995-12-15
KR960000509A (ko) 1996-01-25
ES2109753T3 (es) 1998-01-16
DE69500974T2 (de) 1998-03-26
BR9502711A (pt) 1996-01-16
US5526746A (en) 1996-06-18
FR2720975B1 (fr) 1996-07-19

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