EP0631868B1 - Dispositif pour tendre en repérage des plaques d'impression sur les cylindres de machines d'impression - Google Patents

Dispositif pour tendre en repérage des plaques d'impression sur les cylindres de machines d'impression Download PDF

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Publication number
EP0631868B1
EP0631868B1 EP94108401A EP94108401A EP0631868B1 EP 0631868 B1 EP0631868 B1 EP 0631868B1 EP 94108401 A EP94108401 A EP 94108401A EP 94108401 A EP94108401 A EP 94108401A EP 0631868 B1 EP0631868 B1 EP 0631868B1
Authority
EP
European Patent Office
Prior art keywords
tensioning
printing
plate
fixing device
clamping
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
EP94108401A
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German (de)
English (en)
Other versions
EP0631868A1 (fr
Inventor
Nikola Pupic
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0631868A1 publication Critical patent/EP0631868A1/fr
Application granted granted Critical
Publication of EP0631868B1 publication Critical patent/EP0631868B1/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
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1243—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by pivotal or swivelling motion, e.g. by means of a rocking lever
    • 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
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices

Definitions

  • the invention relates to a method and a device for the precise fitting of printing plates on the plate cylinder of printing machines, in particular sheetfed offset printing machines, according to the preamble of claim 1 and 2 respectively.
  • a printing plate is attached to the plate cylinder by means of tensioning rails arranged in a cylinder channel and assigned to the printing start and the printing end, by first inserting (clamping) the printing start of the printing plate into the corresponding tensioning rail, and by slowly turning the plate cylinder forward, the printing plate is placed around its outer circumference and then the print end is also clamped or otherwise fixed in the second tensioning rail. The pressure plate is then tensioned, for which purpose the corresponding tensile force is exerted on the pressure plate in the circumferential direction of the plate cylinder via the tensioning rail assigned to the pressure end.
  • DE 4 128 994 A1 discloses a clamping and tensioning device for the plate cylinder of printing presses of the comparable type of device briefly outlined above.
  • the fastening devices are designed as a tensioning rail which is subdivided over the format width and comprises a tensioning bar and a clamping bar, which is mounted so as to be pivotable overall about an axis.
  • the individual tensioning rail sections are assigned compression springs, by means of which the corresponding tensile force for tensioning is applied after the clamping of the pressure plate by pivoting the tensioning rail sections.
  • the pressure plate is relaxed by a restoring element and pivoting of the tensioning rail sections against the force of the compression spring.
  • a pivotable clamping rail is also known, in which the clamping force for the printing plates is applied by individual compression springs and in which the present invention is preferably used.
  • the tensioning rail is divided several times over the format width and a compression spring is assigned to each individual tensioning rail section. So that the clamping forces acting in sections on the end of the pressure plate can be exerted on the one hand and, on the other hand, consciously, sections of differently strong clamping forces can be exerted on the printing plate, according to this device, as in the case of the clamping device described in the US patent, it is provided that each compression spring has corresponding Adjusting screws can be biased differently.
  • This correction option is particularly useful in the case of printing plates Sheetfed offset presses are important because the printed paper tends to warp at the end of the print due to dampening solution and different subject distribution, and the resulting registration problems have to be compensated for by tensioning the printing plates to different extents across the format width.
  • a disadvantage of the correction option described above for preloading springs is that the corresponding screws often have to be rotated by a large number of turns until the corresponding expansion forces act on the pressure plate (series connection of a tensioning screw and a compression spring).
  • the individual clamping screws must then be turned back to their original position in order not to distort the subsequent printing plate with the previously set clamping force that acts differently across the format width.
  • DE 3 519 869 C2 discloses a tensioning rail for the plate cylinder of printing presses, in which the rear tensioning rail is supported in a cylinder-fixed manner by means of spaced tensioning screws.
  • the clamping screws act positively directly on the cylinder body, so that a different warping of the pressure plate can be achieved with a relatively small angle of rotation of the individual clamping screws.
  • the corresponding settings must be undone after removing an old printing plate. So that the tensioning and resetting of the tensioning screws can be carried out as quickly as possible, this document suggests a hand tool for moving the tensioning rail in the direction of tensioning. A quick turning of the clamping screws by hand, but the hand tool must be operated at the same time.
  • EP 0 534 214 A1 discloses a method and a corresponding device for correcting trapezoidal register deviations with a clamping of the trailing edge of the printing plate.
  • the fastening device for the pressure plate end also has spring elements, by means of which the clamping force is generated in the circumferential direction.
  • the fastening device is additionally assigned a tensioning device, by means of which the tensile force exerted on the pressure plate can be continuously increased, which causes the pressure plate to stretch and thus lengthen.
  • this known additional clamping device is such that it is reset only before the printing plate is unclamped, so that this additional clamping force acts on the printing plate over very long periods of time.
  • the object of the present invention is therefore to expand a method and a device according to the preamble of claim 1 or 2 such that a precisely fitting clamping of printing plates can be carried out with simple means and in particular with little operating effort.
  • a tool of simple design and manual operation is provided, which is essentially made up of a shaft, a handle attached to one end of the shaft and a curved piece (eccentric) attached to the other end of the shaft. If corresponding corrections are to be carried out after clamping a printing plate and, for example, additional first test prints, this tool is inserted with the end at which the curve piece is located into that bore in the tensioning rail section at which a correction is desired. By turning the curve piece, this tensioning rail section is then tightened more in the direction of the pressure plate by exactly the intended amount. After correction by the desired amount can be removed from the hole in the tool according to the invention.
  • the additional tensioning devices assigned to the tensioning rail sections are arranged in the pit of the plate cylinder as hydraulic, pneumatic or electrically remotely operated devices.
  • the piston rod of this hydraulic cylinder can be brought into positive contact with the tensioning rail after a first actuation, and then the tensioning rail around the corresponding one by appropriate pressure medium application Correction path can be moved.
  • the correction path could be detected, for example, by an odometer attached to the tensioning rail. It would also be possible to assess the resulting correction by examining test sheets and to cancel the correction exactly when the print result is flawless with regard to this criterion. After the correction has been made, the corresponding working cylinder is reset to its initial position by relieving the pressure medium, the piston rod then no longer having any form-fitting contact with the corresponding clamping rail section.
  • FIGS. 2 and 3 The mode of operation of a tensioning rail is briefly explained with reference to FIGS. 2 and 3, in which the tensioning tool according to the invention can preferably be used.
  • FIG. 3 shows in section a part of the plate cylinder 1 with the axially parallel pit 2 located therein.
  • the printing end DE of the plate cylinder 1 is marked.
  • a plurality of fastening devices 3 in the form of clamping rails or clamping rail sections are pivotally mounted about a pivot axis 5 over the format width of the printing plate, the pivot axis 5 being fixed in a cylinder is arranged.
  • Fig. 2 shows a top view of two fastening devices 3 or clamping rail sections.
  • Each tensioning rail section or each fastening device 3 has a detection area 4 running over its width for inserting the area assigned to the printing end DE of the printing plate.
  • this detection area 4 is designed as a corresponding receiving gap for the printing plate end, in which the printing plate or the printing plate end is clamped by means which are not shown but are known per se. Detection area 4 will be opened to release an old printing plate or to insert a new one.
  • a pull rod 8 is articulated by means of a pierced bolt 7, which at its other end in an indicated clearance of the plate cylinder 1 below of the bottom of the pit 2 has a plate 9.
  • the pull rod 8 is carried out through a corresponding opening of a plate 11 fixedly arranged at the bottom of the pit 2.
  • a compression spring 10 is tensioned, by the force of which the fastening device 3 or this clamping rail section can be pivoted clockwise from the position shown in FIG. 3 about the pivot axis 5.
  • each fastening device 3 or each clamping rail section is assigned a compression spring 10 acting via the pull rod 8 and, on the other hand, a pair of tabs 12, each with a lever 13. All fastening devices 3 or
  • Tensioning rail sections are pivoted by the common actuating shaft 14.
  • Fig. 3 From Fig. 3 it can be seen that the fastening device 3 or the shown tensioning rail section is pressed forward by swiveling the actuating shaft 14 against the force of the compression spring 10 (counterclockwise) from a completely swung-back position (not shown) into the position shown in Fig. 3 will (see arrow).
  • the actuating shaft 14 can be actuated by drive means located inside or outside the cylinder.
  • a bore 15 is made in the cylinder-fixed plate 11.
  • the clamping tool consists of a wavy shaft 18 at one end of the pin to be inserted into the bores 15 and at its end the other end, a handle 19 is attached, which is formed, for example, from two cross bolts for manually applying a larger torque.
  • the clamping tool has a curve piece 20, which is shown in FIG. 2 in the form of an eccentric section.
  • the outer contour of this curve piece 20 is spherical, so that when turning this curve piece 20 and when acting on the corresponding part of the fastening device 3, depending on the pivoting position of the fastening device 3, there is an optimal contact surface.
  • the bores 15 in the cylinder-fixed plate 11 and the minimum and maximum stroke of the cam piece 20 are chosen such that, when the fastening devices 3 or the tensioning rail sections are in a position as shown in FIG. 1, a sufficiently large correction path in any case Pivoting the fasteners 3 is possible.
  • the curve piece 20 is mounted at such a height of the clamping tool inserted into the bore 15 with the pin 16, so that the outer contour of the curve piece 20 with optimal leverage on the lower side facing the pit 2 of the Fastening device 3 attacks.
  • the fastening devices 3 or the corresponding clamping rail sections are additionally pivoted by manually turning the clamping tool in the manner of a cam control.
  • the pressure plate 6 is stretched in the corresponding tensioning rail section over the initial length and thus the necessary correction stretching is brought about.
  • the slope of the curve piece 20 can be matched to a half or a full turn of the handle 19 of the clamping tool, so that a between the pivoting of the clamping tool and the pivoting of the fastening device 3 linear relationship exists.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Rotary Presses (AREA)

Claims (5)

  1. Procédé pour tendre, de façon repérée, des plaques d'impression (6) sur le cylindre porte-plaque (1) de machines d'impression, en particulier des machines d'impression offset à feuilles, dans lequel, pour tendre, un bord, associé à l'extrémité d'impression (DE), de la plaque d'impression (6) est déplacé sensiblement en direction périphérique du cylindre porte-plaque (1) par l'intermédiaire d'un dispositif de fixation (3) agencé dans un canal (2), parallèle à l'axe, du cylindre porte-plaque (1) par la force d'éléments élastiques (10) associés au dispositif de fixation (3) ainsi que par la force d'un dispositif de tension supplémentaire (17),
    caractérisé en ce que, pour l'alignement repéré après la tension de la plaque d'impression (6), le dispositif de tension supplémentaire (17), qui coopère exclusivement lors de son actionnement, de façon mécanique, avec le dispositif de fixation (3), est actionné et, de plus, le dispositif de tension (17) déplace le dispositif de fixation (3) en direction de la force de tension engendrée par les éléments élastiques (10).
  2. Dispositif pour tendre, de façon repérée, des plaques d'impression (6) sur le cylindre porte-plaque (1) de machines d'impression, en particulier des machines d'impression offset à feuilles, le cylindre porte-plaque (1) présentant, dans un canal parallèle à l'axe (2), un dispositif de fixation (3) pour un bord, associé à l'extrémité d'impression (DE), d'une plaque d'impression (6), le dispositif de fixation (3) étant associé à des éléments élastiques (10) dont la force permet de tendre l'extrémité d'impression (DE) de la plaque d'impression (6) sensiblement en direction périphérique du cylindre porte-plaque (1), et un dispositif de tension supplémentaire (17) étant associé au dispositif de fixation (3), grâce auquel le dispositif de fixation (3) peut être déplacé sensiblement en direction périphérique du cylindre porte-plaque (1), pour mettre en oeuvre le procédé selon la revendication 1,
    caractérisé en ce que le dispositif de tension supplémentaire (17) est réalisé sous forme d'un outil de tension pouvant être actionné manuellement, en ce que l'outil de tension pouvant être actionné manuellement est constitué d'un arbre (18) qui présente, à une extrémité, une poignée (19) et, à l'autre extrémité, un tourillon (16) dans le prolongement de l'arbre (18), lequel peut être introduit dans un perçage (15) agencé de façon solidaire du cylindre et associé au dispositif de fixation (3), et en ce que, dans la zone entre le tourillon (16) et l'arbre (18), il est agencé une came (20) laquelle agit sur la partie, tournée vers le canal (2), du dispositif de fixation (3), le dispositif de fixation (3) étant monté de façon pivotante autour d'un axe de pivotement (5) s'étendant parallèlement à l'axe du cylindre porte-plaque (1).
  3. Dispositif selon la revendication 2,
    caractérisé en ce que le contour externe de la came (20) est de forme convexe.
  4. Dispositif selon les revendications 2 ou 3,
    caractérisé en ce que, dans le cas où il existe plusieurs dispositifs de fixation (3) prévus sur la largeur du format de la plaque d'impression (6), un perçage (15) pour l'introduction du tourillon (16) de l'outil de tension est associé à chaque dispositif de fixation (3).
  5. Dispositif selon les revendications 2, 3 ou 4,
    caractérisé en ce que, dans le cas où il existe plusieurs dispositifs de fixation (3) prévus sur la largeur du format de la plaque d'impression (6), ceux-ci sont montés de façon déplaçable d'une valeur déterminée en direction axiale, et en ce que des perçages solidaires du cylindre (15) sont agencés dans la zone entre les dispositifs de fixation (3) pour l'introduction du tourillon (16) de l'outil de tension.
EP94108401A 1993-06-30 1994-06-01 Dispositif pour tendre en repérage des plaques d'impression sur les cylindres de machines d'impression Expired - Lifetime EP0631868B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4321751 1993-06-30
DE4321751A DE4321751C1 (de) 1993-06-30 1993-06-30 Vorrichtung zum paßgenauen Spannen von Druckplatten auf dem Plattenzylinder von Druckmaschinen

Publications (2)

Publication Number Publication Date
EP0631868A1 EP0631868A1 (fr) 1995-01-04
EP0631868B1 true EP0631868B1 (fr) 1996-10-09

Family

ID=6491599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94108401A Expired - Lifetime EP0631868B1 (fr) 1993-06-30 1994-06-01 Dispositif pour tendre en repérage des plaques d'impression sur les cylindres de machines d'impression

Country Status (5)

Country Link
US (1) US5452659A (fr)
EP (1) EP0631868B1 (fr)
JP (1) JP2644449B2 (fr)
AT (1) ATE143865T1 (fr)
DE (2) DE4321751C1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6096870A (en) * 1994-01-05 2000-08-01 Sepragen Corporation Sequential separation of whey
DE19511075A1 (de) * 1995-03-25 1996-09-26 Roland Man Druckmasch Verfahren und Vorrichtung zum Aufziehen flexibler Druckformen
US5553545A (en) * 1995-09-26 1996-09-10 Heath Custom Press, Inc. Plate clamping and tensioning apparatus for rotary printing press
US5817354A (en) * 1996-08-22 1998-10-06 Sepragen Corporation High throughput debittering
DE19634947C1 (de) * 1996-08-29 1998-01-08 Roland Man Druckmasch Justiervorrichtung für Druckplatten
DE29621906U1 (de) * 1996-12-17 1997-02-06 Heidelberger Druckmaschinen Ag, 69115 Heidelberg Stellvorrichtung für eine Höhenverstellung von diametral gegenüberliegend angeordneten Greiferaufschlagleisten an bogenführenden Zylindern von Druckmaschinen
DE19707063C1 (de) * 1997-02-22 1998-07-30 Roland Man Druckmasch Verfahren zur Durchführung von Seitenregisterkorrekturen sowie entsprechende Vorrichtung
DE10151052C1 (de) 2001-09-26 2003-02-06 Roland Man Druckmasch Spannvorrichtung für eine Druckform
DE102004052823A1 (de) * 2004-11-02 2006-05-04 Koenig & Bauer Ag Vorrichtung zum Klemmen und Spannen des nachlaufenden Endes einer Druckplatte

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD67443A (fr) *
DE67443C (de) * A. TENNER in Berlin S.W., Grofsbeerenstrafse 13a Schrotpatronen-Lademaschine mit schrittweise gedrehtem Tisch und zangenartig sich selbstthätig schliefsenden Hülsenlagern
US3107609A (en) * 1961-05-04 1963-10-22 Emric G Haramija Mechanism for holding and tensioning a printing plate on a printing cylinder
DE2065582C3 (de) * 1970-12-05 1978-10-12 Koenig & Bauer Ag, 8700 Wuerzburg Vorrichtung zum Klemmen von nicht abgekanteten Druckplattenenden biegsamer Druckformen
US3973496A (en) * 1973-10-29 1976-08-10 Ball Corporation Apparatus for mounting and locking printing plates
DE2431133A1 (de) * 1974-06-28 1976-01-15 Roland Offsetmaschf Druckplatten-spannvorrichtung
US4191106A (en) * 1975-12-01 1980-03-04 K and Manufacturing Company, Inc. Printing plate clamping assembly
DE3519869A1 (de) * 1985-06-03 1986-12-04 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Spannschiene am plattenzylinder von rotationsdruckmaschinen
DE4128994A1 (de) * 1990-12-31 1992-07-02 Heidelberger Druckmasch Ag Klemm- und spanneinrichtung
JP2542102Y2 (ja) * 1991-03-14 1997-07-23 株式会社小森コーポレーション 印刷機の版万力装置
EP0534214B1 (fr) * 1991-09-20 1996-03-06 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et dispositif pour la correction de divergences trapézoidales des repères
DE4214168C2 (de) * 1992-04-30 1994-10-06 Roland Man Druckmasch Vorrichtung zum Aufspannen von Druckplatten auf dem Plattenzylinder von Druckmaschinen, insbesondere Bogenoffsetdruckmaschinen

Also Published As

Publication number Publication date
ATE143865T1 (de) 1996-10-15
DE59400808D1 (de) 1996-11-14
EP0631868A1 (fr) 1995-01-04
US5452659A (en) 1995-09-26
JP2644449B2 (ja) 1997-08-25
DE4321751C1 (de) 1994-11-24
JPH0725000A (ja) 1995-01-27

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