EP0110138B1 - Dispositif pour échanger le cliché dans une machine à imprimer offset - Google Patents

Dispositif pour échanger le cliché dans une machine à imprimer offset Download PDF

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Publication number
EP0110138B1
EP0110138B1 EP83110721A EP83110721A EP0110138B1 EP 0110138 B1 EP0110138 B1 EP 0110138B1 EP 83110721 A EP83110721 A EP 83110721A EP 83110721 A EP83110721 A EP 83110721A EP 0110138 B1 EP0110138 B1 EP 0110138B1
Authority
EP
European Patent Office
Prior art keywords
forme
plate
suction roll
suction
film
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
Application number
EP83110721A
Other languages
German (de)
English (en)
Other versions
EP0110138A3 (en
EP0110138A2 (fr
Inventor
Hans Joachim Jähme
Harry Bracke
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.)
Neue Rotaprint GmbH
Original Assignee
Neue Rotaprint 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 Neue Rotaprint GmbH filed Critical Neue Rotaprint GmbH
Priority to AT83110721T priority Critical patent/ATE40080T1/de
Publication of EP0110138A2 publication Critical patent/EP0110138A2/fr
Publication of EP0110138A3 publication Critical patent/EP0110138A3/de
Application granted granted Critical
Publication of EP0110138B1 publication Critical patent/EP0110138B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L29/00—Devices for attaching printing elements or formes to supports
    • B41L29/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41L29/14—Clamping devices
    • B41L29/16—Clamping devices operating automatically during operation of rotary machines to attach the printing formes to the forme cylinders

Definitions

  • the present invention relates to a film changer for offset printing machines according to the preamble of the main claim.
  • a rubbing roller is provided which engages the top film of the film stack and is rotated at the appropriate point in time, so that the top film is pushed down from the film stack and placed in a guide device consisting of rollers and guides or guide plates, which it is used for Forme cylinder leads. It is held there during printing by known means, for example by suitable grippers. As soon as a film change is to be carried out, the grippers open on the basis of suitable controls and the film is conveyed from the forme cylinder into a storage for used films.
  • a disadvantage of this embodiment is, however, that the separation is not always satisfactory and that visible traces can appear on a finished printed product, since the friction roller acts on the surface of the film carrying the graphic information.
  • the suction roller does not roll on the cylinder with which it forms a conveyor roller nip. Rather, the printing film only reaches the conveyor roller gap when the suction roller is in its rear dead center position, that is to say it assumes a precisely defined position at this point in time.
  • the possibility of conveying the film into this position as long as printing is still taking place with the preceding printing film.
  • the film is only conveyed on when the press control activates the transport roller. Suitable control devices can also be provided which determine whether a printing film is properly in the conveyor roller nip during the waiting position described.
  • the arrangement of the adige and fixing container directly below the separating device results in a particularly space-saving arrangement which enables a compact construction of the printing press.
  • the negative pressure required for the suction roller is generated in a particularly simple manner in that the back and forth movement of the suction roller is used to move a piston back and forth in a fixed pump cylinder and thus to use the suction stroke of the piston to generate the negative pressure.
  • the reciprocating and at the same time rotating movement of the suction roller for peeling or unwinding the front section of the bottom film is generated by a degree guide of a crank mechanism, with a gear being provided at one end of the suction roller axis, which meshes with a rack fixedly arranged on the machine frame . Since the pitch circle diameter of the gear is equal to the suction roll diameter and the linear displacement of the suction roll corresponds to at least half of its development, the bottom film of the stack is initially subjected to bending alone without the action of any tensile stress, since the suction roll just after the suction of the bottom film in the mass is moved along the bottom of the film as the film wraps around the rotating suction roll.
  • the suction roller Due to the special design of the suction roller in several suction sections spaced apart in the axial direction with rollers or ball bearings arranged between them, freely movable with respect to the suction sections and having essentially the same (or slightly enlarged) diameter as the suction roller, the peeled off bottom film between one and the other succeeds to introduce parallel to the suction roller conveyor roller and the aforementioned rollers or ball bearings; only then is the film driven by a forced drive of the conveyor roller mentioned, i.e. when the actual separation process has long been completed.
  • the vacuum in the pump cylinder and thus also in the suction roller can be reduced at the right time by using the piston near its bottom dead center at the end of the suction stroke exposes one or more holes in the cylinder wall which vent the cylinder to the atmosphere.
  • the film changer is arranged obliquely above the forme cylinder of a conventional offset printing press, the construction of which is not discussed in detail in the context of this description, since it is sufficiently known.
  • the arrangement of the film stacking table is indicated by the film stack 2.
  • the underside of the table in the area of the front stacking edge has a sufficiently dimensioned opening so that the suction roller 4 can reach the foils in the foil stack 2 when it moves back and forth there under the influence of the crank mechanism 6 and rotates at the same time.
  • the front dead center position of the suction roller is shown in dashed lines, while the fully drawn rear position of the suction roller with the crank mechanism is in the corresponding position just before the rear dead center.
  • the suction roller 4 or its axis is rotatably mounted in the straight guide 8 of the crank mechanism 6, the outer end of the suction roller axis being connected to a gearwheel 10, the pitch circle diameter of which corresponds exactly to the diameter of the suction roller and which meshes with a toothed rack 12 attached to the machine frame 14 .
  • This mounting of the suction roller 4 in connection with the dimensioning of the gear 10 ensures that the suction roller 4 forcibly rolls or seems to roll on the underside of the film stack during its back and forth movement.
  • the suction roll is divided into individual suction roll sections 5 distributed over their length, one of which is shown in FIG. 2.
  • Each cylindrical suction roller section has a suction cup arranged on the circumference, which points vertically upwards in the front dead center position of the suction roller (shown in broken lines in FIG. 1) in order to engage the film, and which in the fully drawn position in FIG is twisted at the bottom.
  • This is the position just before reaching the rear dead center of the suction roll 4, i.e. at the rear dead center, the suction roller is rotated by a little more than 180 °, on the one hand to securely insert the film into the nip between the rollers 16 and the suction roller 4 and on the other hand not to let the film rub against the suction cups when the film is being removed.
  • freely rotatable rollers or ball bearings 16 are arranged with a diameter which essentially corresponds to the diameter of the suction roll sections or is slightly larger. The purpose of these ball bearings or rollers 16 will be discussed in more detail below.
  • the vacuum required for the singling process for the suction roll is generated in a particularly advantageous manner by taking advantage of the already existing back and forth movement of the straight guide 8.
  • the hollow axis of the suction roll is connected via the straight guide, which serves as a bearing for the suction roll axis, to a hollow piston rod 20, which reciprocates a piston 18 in a pump cylinder 19, which is axially aligned with the straight guide.
  • the suction cups on the suction roller sections 5 come in the vicinity of the front dead center position of the straight guide 8 (corresponds to the top dead center of the cylinder piston) or preferably shortly thereafter in contact with the bottom film, i. H. shortly after the start of the suction stroke of the pump piston. Since the suction cups are closed by the lowermost film, the vacuum required to hold the lowermost film on the suction cups of the suction roll sections 5 results due to the suction stroke of the pump piston 18, so that the film is on the underside of the film cassette during the forced rolling of the suction roll the suction roll winds, ie peeled down from the film stack.
  • the pump piston 18 Shortly before or when the end of the suction stroke is reached, the pump piston 18 exposes one or more ventilation bores 21 provided in the cylinder wall, which open into the atmosphere and cause the negative pressure in the pump cylinder and thus also in the suction roller 4 to collapse, since these parts are guided in a straight line 8 and the hollow piston rod 20 are connected to one another in a pressure-tight manner. As a result of this reduction in pressure, the film wound onto the suction roll 4 can detach from the suction cups at the rear dead center.
  • a conveyor roller 22 is arranged axially parallel to and perpendicularly below the suction roller 4 in its rear dead center position, in such a way that the ball bearings provided on the suction roller axis or the freely rotatable rollers 16 form a conveyor roller nip for the film peeled off from the underside of the stack. Due to the rotation and simultaneous linear displacement of the suction roller 4, the front edge of the bottom film of the stack is inserted into this conveyor roller nip. Since the negative pressure in the suction roller is reduced as previously explained when the rear dead center position (bottom dead center of the piston) is reached, the suction cups on the suction roller sections 5 no longer hold the peeled-off film in this position, so that the conveyor roller 22 is driven clockwise ( in Fig. 1) in Interaction with the rollers or ball bearings 16 on the suction roll axis when the suction roll 4 or straight guide 8 is not displaced pulls out the bottom film completely under the film stack 2.
  • the film conveyed between the rollers 16 and the conveying roller 22 is then guided downward into the fixing container 26 by a guide rail arrangement 24 which is essentially semicircular in section and which can be provided to form a correspondingly shaped slot on both sides of the transport path there is a suitable fixing fluid.
  • the aforementioned semicircular guide arrangement 24 has a straight extension 25 at its end, which leads the film pushed through the fixing bath out of it again and guides it in the direction of a pair of conveyor rollers 27, 28 which is provided at the end of the fixing container 26 facing the forme cylinder 3 .
  • the conveyor roller 27 is coupled to the aforementioned conveyor roller 22 via a belt drive or the like, the drive of the two conveyor rollers taking place synchronously with the printing press drive, for example via an electromagnetically actuated clutch which is activated by the machine control in a pulse-controlled manner when a new film is used to be applied to the forme cylinder 3.
  • the pair of conveying rollers 27, 28 pushes the printing film coming from the fixing container in the direction of the forme cylinder 3 under conventional grippers or the like, not shown, which hold the printing film on the forme cylinder, so that the printing film is automatically stretched onto the forme cylinder due to a corresponding rotation thereof .
  • the actual printing process that then follows of the offset printing machine with the stretched printing film is not described in more detail in the context of the present description, since it is sufficiently known and is not necessary to explain this invention.
  • the grippers mentioned are opened and the used film is automatically removed from the forme cylinder and, for example with the aid of the pair of conveying rollers 30, 31, is output into the tray 32 for used films.
  • the separating device activates again from the printing press control and, in the manner described, peels off the front section of the bottom film of the stack and brings it between the rollers 16 and the conveying roller 22, so that the film is completely pulled off the stacking table and can be passed through the fixing bath in order to then be pushed back into the grippers on the forme cylinder, which rotates at a corresponding speed in order to tension the film on the forme cylinder.

Landscapes

  • Sheets, Magazines, And Separation Thereof (AREA)
  • Rotary Presses (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Claims (7)

1. Dispositif pour échanger le cliché dans une machine à imprimer offset, comprenant une table port-clichés (2), un dispositif pour séparer les clichés, destiné à prélever les clichés de la table porte-clichés, et un équipement pour transporter et guider les clichés, lequel porte le nouveau cliché, qui doit être appliqué au cylindre porte-clichés (3) de la machine à imprimer offset et provenant du dispositif de séparation, par un réservoir de l'agent de gravure ou de fixage (16) vers un cylindre porte-clichés, et conduit le cliché utilisé du cylindre porte-clichés à un dépôt (32); le dispositif de séparation étant constitué d'un rouleau aspirant (4), disposé au dessous, en partie ouvert, de la table porte-clichés (2) et s'attaquant au bas du tas des clichés, dont l'axe est parallèle à l'arête avant du tas des clichés, caractérisé en ce que le rouleau aspirant peut se déplacer de façon linéaire et parallèle au bas du tas et qu'il forme, dans la position au point mort arrière, une fente avec un rouleau transporteur (22), par laquelle le cliché est introduit dans le réservoir de l'agent de gravure ou de fixage, disposé directement au-dessous du tas des clichés et du dispositif de séparation.
2. Dispositif pour échanger le cliché selon la revendication 1, caractérisé en ce que l'axe du rouleau aspirant (4) est logé dans un guidage rectiligne (8) d'une transmission à bielle (6), le mouvement rotatif du rouleau aspirant (4) étant dérivé d'une crémaillère (12), fixée rigidement au bâti de la machine (14) et qui s'engrène avec une roue dentée (10) reliée à l'axe du rouleau aspirant.
3. Dispositif pour échanger le cliché selon la revendication 2, caractérisé en ce que le diamètre du rouleau aspirant correspond au diamètre primitif de référence de la roue dentée (10) et que le déplacement linéaire du rouleau aspirant (4) correspond au moins à la moitié de son développement.
4. Dispositif pour échanger le cliché selon une des revendications 1 à 3, caractérisé en ce que le rouleau aspirant (4) est divisé, dans le sens axial, en plusieurs segments (5) avec interposition de galets (16) à rotation mobile par rapport aux segments du rouleau aspirant et ayant un diamètre essentiellement égal, lesquels, dans la zone du point final du déplacement linéaire, forment, avec un rouleau transporteur (22) parallèle à l'axe, une fente pour l'introduction du cliché inférieur partiellement pelé du bas du tas.
5. Dispositif pour échanger le cliché selon la revendication 4, caractérisé par une configuration de glissières de guidage (24) disposée en coupe de façon semi-circulaire, laquelle, partant de la fente des rouleaux transporteurs, conduit au réservoir à fixateur (26), et de la à une paire de rouleaux transporteurs (27, 28), disposée au bord de ce dernier, à côté du cylindre porte-clichés (3).
6. Dispositif pour échanger le cliché selon une des revendications précédentes, caractérisé en ce que l'intérieur du rouleau aspirant (4), se déplaçant d'un mouvement alternatif, est relié par une tige de piston creuse (20) de façon étanche à l'intérieur d'un cylindre de pompe fixe (19), dans lequel un piston de pompe (18), relié à la tige de piston (20), peut se déplacer pour réaliser la dépression d'aspiration pour le rouleau aspirant (4).
7. Dispositif pour échanger le cliché selon la revendication 6, caractérisé en ce que le cylindre de pompe (19) peut être aérer, à proximité de la position au point mort inférieur du piston de pompe (18) (correspondant) à la position au point mort arrière du guidage rectiligne 8), par une forure d'aération (21) positionnée de façon correspondante et débouchant dans l'atmosphère.
EP83110721A 1982-10-26 1983-10-26 Dispositif pour échanger le cliché dans une machine à imprimer offset Expired EP0110138B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83110721T ATE40080T1 (de) 1982-10-26 1983-10-26 Folienwechsler fuer offset-druckmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3239580 1982-10-26
DE19823239580 DE3239580A1 (de) 1982-10-26 1982-10-26 Folienwechsler fuer offset-druckmaschinen

Publications (3)

Publication Number Publication Date
EP0110138A2 EP0110138A2 (fr) 1984-06-13
EP0110138A3 EP0110138A3 (en) 1985-05-15
EP0110138B1 true EP0110138B1 (fr) 1989-01-18

Family

ID=6176618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110721A Expired EP0110138B1 (fr) 1982-10-26 1983-10-26 Dispositif pour échanger le cliché dans une machine à imprimer offset

Country Status (5)

Country Link
US (1) US4507167A (fr)
EP (1) EP0110138B1 (fr)
JP (1) JPS59131461A (fr)
AT (1) ATE40080T1 (fr)
DE (2) DE3239580A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3940449A1 (de) * 1989-12-07 1991-06-13 Roland Man Druckmasch Handhabungsvorrichtung
DE4213472C2 (de) * 1992-04-24 1994-05-26 Heidelberger Druckmasch Ag Vorrichtung zum Fördern flexibler Druckformen
US6113346A (en) 1996-07-31 2000-09-05 Agfa Corporation Method for loading and unloading a supply of plates in an automated plate handler
US5655452A (en) * 1996-08-07 1997-08-12 Agfa Division, Bayer Corp. Method and apparatus for an automated plate handler with slip sheet removal mechanism
WO2003093010A1 (fr) 2002-04-29 2003-11-13 Heidelberger Druckmaschinen Ag Dispositif de production d'une forme d'impression
US20030202081A1 (en) * 2002-04-29 2003-10-30 Peter Marten Apparatus for producing a printing form
RU2236876C1 (ru) * 2003-07-21 2004-09-27 Закрытое акционерное общество "СИЛЭН" Установка для пожаротушения
US8414587B2 (en) * 2007-01-26 2013-04-09 Laurimed, Llc Styli used to position device for carrying out selective discetomy
US8088119B2 (en) * 2007-02-01 2012-01-03 Laurimed, Llc Methods and devices for treating tissue
CA2720452A1 (fr) * 2008-04-02 2009-10-08 Laurimed, Llc Procedes et dispositifs pour administrer des injections
US8685052B2 (en) 2010-06-30 2014-04-01 Laurimed, Llc Devices and methods for cutting tissue
EP2982320A1 (fr) 2010-06-30 2016-02-10 Laurimed, Llc Dispositifs de découpe et d'évacuation de tissus
WO2013119336A1 (fr) 2012-02-10 2013-08-15 Laurimed, Llc Dispositifs rotatifs commandés par dépression et procédés
US8815099B1 (en) 2014-01-21 2014-08-26 Laurimed, Llc Devices and methods for filtering and/or collecting tissue

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR540479A (fr) * 1921-08-10 1922-07-11 Stokes & Smith Co Mécanisme pour la distribution et l'entraînement des feuilles de papier et objets analogues
US2803078A (en) * 1954-11-12 1957-08-20 John S Swift & Co Inc Machine for finishing photolithographic plates
JPS5541428B2 (fr) * 1973-10-18 1980-10-24
JPS5932311B2 (ja) * 1976-06-14 1984-08-08 リヨ−ビ株式会社 オフセツト印刷機等の給版装置
CH607977A5 (en) * 1976-06-18 1978-12-15 Fritz Lang Device for removing paper sheets from a stack, in particular on a folding machine
JPS5442202A (en) * 1977-08-01 1979-04-04 Ricoh Kk Etching device for offset printer

Also Published As

Publication number Publication date
DE3378968D1 (en) 1989-02-23
EP0110138A3 (en) 1985-05-15
JPS59131461A (ja) 1984-07-28
EP0110138A2 (fr) 1984-06-13
ATE40080T1 (de) 1989-02-15
DE3239580A1 (de) 1984-04-26
US4507167A (en) 1985-03-26

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