EP0029218A1 - Dispositif de serrage de clichés - Google Patents

Dispositif de serrage de clichés Download PDF

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Publication number
EP0029218A1
EP0029218A1 EP80106994A EP80106994A EP0029218A1 EP 0029218 A1 EP0029218 A1 EP 0029218A1 EP 80106994 A EP80106994 A EP 80106994A EP 80106994 A EP80106994 A EP 80106994A EP 0029218 A1 EP0029218 A1 EP 0029218A1
Authority
EP
European Patent Office
Prior art keywords
plate
clamping
levers
cylinder
type
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Withdrawn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
EP80106994A
Other languages
German (de)
English (en)
Inventor
Werner Fels
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.)
Dr Ing Rudolf Hell GmbH
Original Assignee
Dr Ing Rudolf Hell 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 Dr Ing Rudolf Hell GmbH filed Critical Dr Ing Rudolf Hell GmbH
Publication of EP0029218A1 publication Critical patent/EP0029218A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • B41F27/1262—Devices for attaching printing elements or formes to supports for attaching flexible printing formes without tensioning means

Definitions

  • the invention relates to a device for register-correct clamping of printing form plates, in particular offset printing plates on plate cylinders of printing machines.
  • the register adjustment devices of the printing presses can usually only adjust the register in the two main directions mentioned. If a register error arises, for example, that the plates are applied to the cylinder in the form of a helical line, possibly with an opposite gradient between the individual colors, then correction using the provided register devices is no longer possible at all. In order to produce perfect prints, the plates then have to be stretched again with a lot of time.
  • the ideal solution would be a clamping device that brings the plate onto the cylinder quickly and in accordance with the register, regardless of the skill of the operator.
  • the plates are held by axially arranged flat pieces which are inserted into the cylinders and which clamp the front edge of the plate through the friction between the flat underside of a clamping bar and a flat surface on the cylinder.
  • the clamping pressure is usually generated with a plurality of distributed in the axial direction o screws.
  • the clamping bar is often designed to be divided into one or more parts, and there are devices available for axially displacing the clamping bar segments within certain limits in order to compensate for clamping errors.
  • Torquelimiting 0 Tools for tightening the clamping bar screws can only partially overcome this disadvantage, because the set torque is effective as pressing pressure only via the threaded efficiency of the screws. This in turn depends heavily on the condition of the thread, lubrication, etc. In practice, the tolerances of the elements involved are usually greater than the close tolerance of the required pressure. Attempts have been made to make use of interlocking, undulating or triangular-toothed longitudinal grooves in the press beam and counter surface. to increase the friction in the cylinder at a given pressure. However, it can be seen immediately that such a device must inevitably lead to an elongation of the plate in the clamping area, because the formerly flat plate surface adapts to the grooving by permanent deformation. Registering or even pre-registering via pins in the cylinder cannot be achieved with the desired accuracy.
  • the present invention is based on the object of avoiding the disadvantages indicated and of specifying a tensioning device for the front edge of the plate which is suitable, with the greatest possible protection of the plate, of applying it to the cylinder in register.
  • the invention achieves this by the means mentioned in claim 1.
  • Advantageous further developments are specified in subclaims 2 to 6. The invention is described below with reference to Figures 1 to 7.
  • Fig. 1 shows schematically the arrangement of the clamping device according to the invention in the plate cylinder 1 of a printing press.
  • a clamping bar 2 is embedded in a recess in the plate cylinder 1, the flat clamping surface of which for the offset plate 3 merges smoothly into the lateral surface of the plate cylinder.
  • a toggle lever mechanism which consists of the articulated couplers 6 and 7, so that they clamp the offset plate 3 plane-parallel between their essentially flat clamping surfaces and the clamping bar 2.
  • the actuation takes place by turning a Shaft 8 onto which the couplers 7 are firmly wedged
  • the shaft 8 is also rotatably mounted in the end faces of the plate cylinder 1 and has an actuating device (not shown here) outside the cylinder
  • an actuating device for example, a lever or a handwheel and a stop that limits the rotation of the shaft somewhat beyond the extended position of the coupling 6 and 7.
  • Fig. 2 shows the mechanism in the open position.
  • the coupling 6, as shown schematically in FIG. 3, is designed as a compression spring 9. Since the spring 9 is somewhat longer in the relaxed state than the rigid coupling 6, these clamping levers 5 and 5 'come somewhat closer to contact with their pressure surfaces when the mechanism is actuated and press the offset plate 3 resiliently against the clamping bar 2 with a certain force the offset plate 3 can no longer slip during the further clamping process.
  • the resilient clamping levers 5 ' for example in two, which are expediently as far apart as possible, recesses 10 can be incorporated into the clamping surfaces, into which register pins 11 arranged fixedly or removably in the clamping bar engage, as shown schematically in FIG. As a result, the offset plate 3 can be hung on the cylinder 1 with register accuracy even before the clamping, with a corresponding perforation.
  • the third type of tensioning lever 5 is shown in perspective in FIG. 5 and in section in FIG. 6. Stamping dies 12 are incorporated into the tensioning surfaces of these levers, which fit into dies 13 which are incorporated into the clamping bar 2.
  • the clamping levers 5 ′′ equipped with punching tools are, as shown in FIG. 4, coupled to the actuating mechanism via rigid couplings is firmly pressed against the clamping bar 2 so that it can no longer slip or warp.
  • the pressure of the tensioning levers 5 " given by the geometry of the toggle lever mechanism, is relatively low, so that here too there is no need to fear deformation of the plate.
  • the clamping levers in their entirety would not be able to absorb the tangential pull when clamping the plate around cylinder 1.
  • This train is applied by a mechanism, not shown here, at 14 at the rear end of the offset plate.
  • the pulling force can be over 1000 kg for larger machines. Although this force is reduced by the friction in the wrapping, it is still some 100 kg on the clamping bar.
  • Fig. 6 shows the mode of operation of the punch 12 "incorporated in the clamping lever 5" and its dies 13 in the clamping bar 2.
  • the breast surface 15 of the punch 12 cuts through the offset plate and thus forms a.
  • Support edge 16, which is in the corresponding surface of the die 13 supports and can absorb significant forces in the tangential direction.
  • the back 17 of the punch in conjunction with the trough of the die 13 ensures that the non-cut part of the offset plate 3 lies in the trough without creases and that the supporting edge 16 cannot deflect against the pulling direction by deformation.
  • the curvature of the punch 12 and the die 13 is shown somewhat exaggerated in the drawing to clarify the mode of operation.
  • the sheet height of the punch only has to be on the order of a few offset plate thicknesses. If the support edge 6 then has a certain length in the cylinder axis direction, the plastic deformation of the part of the offset plate 3 pressed into the die also remains small.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP80106994A 1979-11-19 1980-11-13 Dispositif de serrage de clichés Withdrawn EP0029218A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2946597A DE2946597C2 (de) 1979-11-19 1979-11-19 Einspannvorrichtung für biegsame Druckplatten
DE2946597 1979-11-19

Publications (1)

Publication Number Publication Date
EP0029218A1 true EP0029218A1 (fr) 1981-05-27

Family

ID=6086355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106994A Withdrawn EP0029218A1 (fr) 1979-11-19 1980-11-13 Dispositif de serrage de clichés

Country Status (4)

Country Link
US (1) US4359941A (fr)
EP (1) EP0029218A1 (fr)
JP (1) JPS5686755A (fr)
DE (1) DE2946597C2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5853631U (ja) * 1981-09-30 1983-04-12 リョービ株式会社 オフセツト印刷機の版掛装置
JPS5932428U (ja) * 1982-08-26 1984-02-29 三菱重工業株式会社 版咬え装置
JPS61175446U (fr) * 1985-04-22 1986-11-01
DE3626936C1 (de) * 1986-08-08 1988-02-11 Koenig & Bauer Ag Plattenklemmeinrichtung
US5013319A (en) * 1989-06-05 1991-05-07 Mount Sinai School Of Medicine Of The City University Of New York Apparatus and method for cornea marking
US5322014A (en) * 1992-08-25 1994-06-21 Keller James J Printing plate register system, device, and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579517A (en) * 1946-11-01 1951-12-25 Chandler & Price Co Method of and means for attaching printing members to cylinders of printing presses
GB1161393A (en) * 1966-05-02 1969-08-13 Gestetner Ltd Improvements in or relating to Clamps in Printing Machinery
DE1561082A1 (de) * 1967-06-20 1970-04-16 Albert Schnellpressen Vorrichtung zum Einspannen des Druckzylinderaufzuges an Druckmaschinen
FR2257427A1 (en) * 1974-01-14 1975-08-08 Houdaille Industries Inc Printing plate for clamp unit support - comprises flexible sheet with aligned straight slits lying along a sheet edge
DE2626503A1 (de) * 1976-06-12 1977-12-22 Peter Dipl Ing Dr Ing Decker Vorrichtung zum befestigen biegsamer druckplatten auf dem formzylinder von druckmaschinen

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2553856A (en) * 1946-03-01 1951-05-22 Addressograph Multigraph Clamp for master sheets of printing machines
US2822754A (en) * 1950-05-29 1958-02-11 William F Huck Plate lock-up mechanisms for printing machines
FR1278391A (fr) 1961-01-19 1961-12-08 Machine d'imprimerie en offset comprenant un dispositif de tension pour les feuilles à imprimer
SU371093A1 (ru) * 1970-04-17 1973-02-22 , вители Устройство для закрепления формной пластины на цилиндре
JPS5528348B2 (fr) * 1972-07-04 1980-07-26
US3976005A (en) * 1974-01-14 1976-08-24 Houdaille Industries, Inc. Printing plate for use with lockup means
JPS5127842U (fr) * 1974-08-21 1976-02-28
US4100854A (en) * 1974-08-28 1978-07-18 Japan Society For Promotion Of Machine Industry Device for mounting resin plate onto plate cylinder
DE2441367B2 (de) * 1974-08-29 1977-12-29 Japan Society for the Promotion of Machine Industry; Tokyo Kikai Seisakusho, Ltd.; Tokio Spannvorrichtung eines formzylinders einer druckmaschine
DE2501716C2 (de) * 1975-01-17 1982-09-02 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Vorrichtung zum Befestigen einer biegsamen Druckplatte auf dem Plattenzylinder einer Rotationsdruckmaschine
JPS58110B2 (ja) * 1975-08-29 1983-01-05 松下電器産業株式会社 シンゴウサイセイソウチ
DE2744371C3 (de) 1977-10-01 1980-04-10 Albert-Frankenthal Ag, 6710 Frankenthal Vorrichtung zum Befestigen und Spannen von biegsamen Druckplatten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579517A (en) * 1946-11-01 1951-12-25 Chandler & Price Co Method of and means for attaching printing members to cylinders of printing presses
GB1161393A (en) * 1966-05-02 1969-08-13 Gestetner Ltd Improvements in or relating to Clamps in Printing Machinery
DE1561082A1 (de) * 1967-06-20 1970-04-16 Albert Schnellpressen Vorrichtung zum Einspannen des Druckzylinderaufzuges an Druckmaschinen
FR2257427A1 (en) * 1974-01-14 1975-08-08 Houdaille Industries Inc Printing plate for clamp unit support - comprises flexible sheet with aligned straight slits lying along a sheet edge
DE2626503A1 (de) * 1976-06-12 1977-12-22 Peter Dipl Ing Dr Ing Decker Vorrichtung zum befestigen biegsamer druckplatten auf dem formzylinder von druckmaschinen

Also Published As

Publication number Publication date
US4359941A (en) 1982-11-23
DE2946597A1 (de) 1981-05-21
DE2946597C2 (de) 1983-03-17
JPS5686755A (en) 1981-07-14

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): CH FR GB IT NL SE

17P Request for examination filed

Effective date: 19810424

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19821210

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FELS, WERNER