EP0150355B1 - Procédé d'impression à retiration et machine d'impression offset à feuilles pour la mise en oeuvre du procédé - Google Patents

Procédé d'impression à retiration et machine d'impression offset à feuilles pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0150355B1
EP0150355B1 EP84114948A EP84114948A EP0150355B1 EP 0150355 B1 EP0150355 B1 EP 0150355B1 EP 84114948 A EP84114948 A EP 84114948A EP 84114948 A EP84114948 A EP 84114948A EP 0150355 B1 EP0150355 B1 EP 0150355B1
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EP
European Patent Office
Prior art keywords
printing
cylinder
blanket
impression cylinder
unit
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
EP84114948A
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German (de)
English (en)
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EP0150355A3 (en
EP0150355A2 (fr
Inventor
Dipl.-Ing. Simeth Claus
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Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Publication date
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Priority to AT84114948T priority Critical patent/ATE50731T1/de
Publication of EP0150355A2 publication Critical patent/EP0150355A2/fr
Publication of EP0150355A3 publication Critical patent/EP0150355A3/de
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Publication of EP0150355B1 publication Critical patent/EP0150355B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset printing
    • B41F7/12—Rotary lithographic machines for offset printing using two cylinders one of which serves two functions, e.g. as a transfer and impression cylinder in perfecting machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset printing
    • B41F7/10—Rotary lithographic machines for offset printing using one impression cylinder co-operating with several transfer cylinders for printing on sheets or webs, e.g. satellite-printing units
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/49—Convertible printing press, e.g. lithographic to letter press

Definitions

  • the invention describes a method and an associated device for producing a perfecting on paper sheets, one side being printed by the offset printing method and the other by the method of direct planographic printing.
  • a device which works according to a method of this type is described in DE-C-179 219.
  • Two-sided printing is possible in different ways.
  • the paper sheets have to be re-stacked after printing on the first page in order to be able to print from the back in a second pass. If two-sided printing is often required, this effort cannot be justified.
  • Another possibility is the sheet turning inside the printing press, so that first one side of the paper and then after the turning process the second side of the paper can be printed in the next printing unit.
  • the effort for the turning device is not insignificant.
  • a larger number of printing units is required if the colors are appropriate. From a printing point of view, however, it also means that the paper is transported with the trailing edge first after the turning process. This makes it difficult to maintain the register of the prints and in particular requires a second gripper edge.
  • the sheet transport is therefore dependent on a relatively large number of transfers and also relies on paper that has been precisely trimmed on all sides.
  • attempts have been made to print the paper on two sides in one pass by simultaneously printing the paper from above and below in a printing zone.
  • a large number of process variants have already been discussed for this.
  • the possibility of producing the simultaneous perfect and reverse printing in the printing between two blanket cylinders has been practically implemented both in the sheetfed offset area and in the web offset area.
  • Machines with two successive complete offset printing units have also become known, but they again require sheet transfer between the prints on the front and back of the paper.
  • the possibility has therefore already been used to also provide the printing cylinder present in offset printing with one or more printing plates and, by changing the circuit, to use it as a plate cylinder and at the same time as a counter-pressure cylinder for offset printing and also as a plate cylinder for direct planographic printing.
  • DE-C-179 219 describes a printing press for simultaneous perfecting with two hard printing forms and a counterpressure or transfer printing element.
  • the printing unit is equipped with a transfer or counter pressure cylinder and two forme cylinders of the same size.
  • An inking and dampening unit for planographic printing are assigned to each forme cylinder.
  • the transfer cylinder is provided with a soft surface and is arranged between the two forme cylinders.
  • the paper is fed between the transfer cylinder and the first forme cylinder.
  • the transfer image of the second forme cylinder that is to say indirectly, is transferred from the transfer cylinder to the underside of the paper, the first forme cylinder acting as an impression cylinder for indirect printing.
  • the other side of the paper is printed directly by the first forme cylinder, from which point of view the transfer cylinder acts as a soft impression cylinder.
  • the printing plate on the first forme cylinder must be copied in reverse to the printing plate on the second printing cylinder in accordance with the printing process.
  • DE-C-366 371 describes a rotary printing machine for lithographic printing. It has a small cylinder covered with a rubber blanket and a second cylinder several times the size, both cylinders being equipped with grippers. Depending on the operating mode and design, the second cylinder can be covered with two or three pressure plates. For this purpose, at least one inking unit is assigned to the second cylinder. With a corresponding circuit, it is possible to first print the colored first plate on the blanket of the first cylinder without a paper feed. When the second plate comes into the printing zone, a sheet of paper is also fed. When passing through the printing zone, the paper sheet is then printed from the small cylinder in offset printing and from the large cylinder in direct flat printing. The two cylinders act as impression cylinders for the other printing process.
  • a cylinder of a printing press does not have to serve only one purpose.
  • the counter-pressure cylinders are covered with printing plates and the rubber cylinders are also used as counter-pressure cylinders.
  • a soft-covered cylinder is used as a counter-pressure cylinder for direct planographic printing.
  • the problem arises that the direct and the indirect flat printing or offset printing must take place under the same conditions, i. that is, the selected machine setting with regard to the provision of printing and cylinder lifts must satisfy both printing processes.
  • EP-A-0 096 181 discloses a printing unit for a sheet-fed offset printing press, in which the printing cylinder is provided with a flexible planographic printing plate in order to produce an additional monochrome backprint.
  • the planographic printing plate is a so-called dilitho plate.
  • the printing process possible in this printing press is subject to the same defective conditions as previously described.
  • offset printing and direct flat printing must be carried out under the same setting conditions. This is not possible without accepting quality losses or exposing the printing plate to increased wear and tear until it is destroyed.
  • the printing plate should be provided with an elastic pad for direct planographic printing. This also means that it is not possible to specifically coordinate the printing process in relation to the printing it provides.
  • the pressure plate is even subjected to double stress because it also bends.
  • the chain removal system for the sheet transport to the delivery must be guided around the second rubber cylinder in order to make room for the inking and dampening unit to be set on the printing cylinder. This makes the construction unnecessarily complicated because the sheet is passed within the printing unit, but must nevertheless be guided safely.
  • the grippers on the chain take-off system are loaded with the full bow pull.
  • the printing tension will be too low for the direct planographic printing, ie the printing may be incomplete because the paper is not pressed sufficiently against the planographic printing plate.
  • the completeness and uniformity of the printed image depends on the smoothness of the paper.
  • the printing provision is adapted to the direct planographic printing, that is to say increased beyond the value for the offset printing, the printing tension is too great for the printing which takes place in the offset process.
  • the ink is squeezed apart between the blanket and the paper. There is an undesirable broadening of points. There occurs therefore a force acting on the two pressure sides' in the opposite direction in the print quality. A middle way must therefore be found here, in which the two processes have the least mutual influence.
  • the invention is therefore based on the object of providing a method and the associated device of the type described, with the aid of which a perfecting print can be produced in a gripper closure without the specifically different setting conditions of the two printing methods influencing one another.
  • the object is achieved according to the characterizing part of claim 1.
  • the printing technique described in a five-cylinder sheetfed offset printing machine it is possible to set up the first printing unit for perfect and one-color printing for optimal adjustment to the printing process that takes place in direct flat printing.
  • the fact that the reverse printing takes place in the first printing unit and the face printing takes place in the second printing unit means that the two printing processes cannot influence one another.
  • the setting values can be selected independently for each process.
  • the printing press which is in itself suitable for two-color face printing, can be used under optimal conditions for perfecting.
  • There is no risk of ink smearing from a sheet side on a guide or impression cylinder since the printing takes place in one pass. Registration problems cannot occur since the printing process also takes place in a gripper closure. This means that the tendency of the printed sheet to curl can also be minimized, since the sheet has to be peeled off to one side from a colored printing area in one pass.
  • the advantage of being able to use a printing machine for straight printing with the help of direct flat printing in a simple way for face and back printing is often canceled out by the shorter lifespan and poorer printing quality of the printing plate for direct flat printing.
  • the method now allows the printing machine to be adjusted with regard to the exact handling for both printing methods and the optimum printing quality, especially for direct planographic printing.
  • the changeover is relatively easy to undertake and does not require any additional measures if the processing for direct planographic printing is selected such that it also applies to two-color straight printing after switching, taking into account the printing length of both prints. This must also be kept between perfecting and perfecting. It is important here that the printing length in the counterprint by the direct printing is determined and that the printing length can be adjusted to it in face printing.
  • the method according to the invention takes all of these conditions into account and ensures that the two methods can be used together with the best possible register, in good print quality, with an optimal service life of the printing plate for direct planographic printing and with the least possible additional effort for face and back printing.
  • the advantages in terms of operation are just as obvious as the advantages of the relatively low mechanical outlay.
  • a sheet-fed offset printing press 1 is shown schematically in FIG.
  • the sheet-fed offset printing machine 1 is designed in a so-called 5-cylinder design.
  • the paper sheets 2 are conveyed from a feeder stack 3 through the printing press 1 to the delivery stack 4 and are deposited there with the aid of a chain conveyor 5.
  • the paper sheets 2 are transferred to grippers 7 on the printing cylinder 8 with the aid of a pre-gripper 6.
  • a total of two rows of grippers 7 offset from one another by 180 degrees are arranged on the printing cylinder 8.
  • the paper sheet 2 comes into contact with the first printing unit 10 to 13. It consists of the first rubber cylinder 10 and the associated first plate cylinder 11.
  • An inking unit 12 and a dampening unit 13 are set on the first plate cylinder 11.
  • the inking unit 12 is connected to the machine drive via a releasable coupling 14. After passage through the printing zone between the impression cylinder 8 and the first blanket cylinder 10 reaches the paper sheet 2, the second printing unit 15 to 18 ', this consisting of the second blanket cylinder 15, the second plate cylinder 16 and placed against this, an inking system 17 and a dampening unit 18. After the passage of the paper sheet 2 through the printing zone between the printing cylinder 8 and the blanket cylinder 15, it is transferred to the chain conveyor 5. The chain conveyor 5 then deposits the paper sheet 2 on the delivery stack 4.
  • the plate clamping devices 20, 21 consist of a clamping device 20 and a clamping device 21. Since the pressure cylinder 8 has twice the diameter of the associated rubber 10, 15 or plate cylinders 11, 16, it is also provided with two of these plate clamping devices 20, 21 each.
  • the clamping devices 20 are each arranged at the front end of the pressure surface below the grippers 7 in the cylinder channel 22 of the printing cylinder 8. They take up the front folded end of one of the planographic printing plates 19. The respective rear end of the planographic printing plates 19 is held by the clamping devices 21, which are also arranged in the cylinder channel 22.
  • the plate ends are clamped and clamped on the pressure cylinder 8.
  • An inking unit 23 and a dampening unit 24 are assigned to the printing cylinder 8 for inking and dampening the planographic printing plates 19.
  • Inking unit 23 and dampening unit 24 are mounted together in one unit 25. With the aid of a displacement device 26, they can be moved radially to the printing cylinder 8 and placed against it.
  • a drive connection is established between the inking unit 23, the dampening unit 24 and the machine drive via a coupling 27.
  • the feeder stack 3 is arranged so far away from the printing units of the sheet-fed offset printing machine that the dampening unit 24 or the inking unit 23 are readily accessible for adjustment.
  • the operating options on the sheetfed offset printing press are favorable because the two printing units are arranged above the printing cylinder 8 in such a way that the plate clamping devices 20, 21 on the printing cylinder 8 between the printing units 10 to 13, 15 to 18 pass through the foot of the delivery 4 are reachable.
  • this sheetfed offset press is suitable for the production of two-color straight printing.
  • This mode of operation is shown schematically in FIG. 2.
  • offset printing plates 28, 29 are clamped onto the plate cylinders 11 and 16, respectively. If the two printing units 10 to 13, 15 to 18 are now set in a manner known per se, a two-color print on the top of the paper sheet 2 is produced via the rubber cylinders 10, 15 during the paper passage between them and the printing cylinder 8.
  • care must be taken to ensure that the pressure provided between the rubber cylinders 10, 15 and the pressure cylinder 8 does not become too high. E .; otherwise there is a risk that the printing ink transferred from the rubber cylinders 10, 15 will be squeezed apart on the paper sheet 2.
  • planographic printing plates 19 must be clamped onto the printing cylinder for direct planographic printing. These planographic printing plates 19 are to be provided on their front edge with a bevel, which is used for clamping on the printing cylinder 8. The bevel is necessary in order to be able to insert the front plate end into the clamping device 20 below the grippers 7 on the pressure cylinder 8. Likewise, each planographic printing plate 19 must be clamped at its rear end in one of the clamping devices 21 and clamped on the surface of the printing cylinder 8.
  • the printing cylinder 8 is rotated in the sheet running direction 9 with the rubber cylinders 10, 15 and planographic printing plates 19 placed thereon.
  • the planographic printing plates 19 are placed smoothly on the printing cylinder 8 and can be clamped with the clamping devices 21 without any problems.
  • FIG. 3 The first version of this mode of operation is shown in FIG. 3.
  • an offset printing plate 29 is clamped onto the second plate cylinder 16. It is used to generate the face print.
  • the second printing unit 15 to 18 is placed on the printing cylinder 8 in a known manner.
  • the plate cylinder 11 is moved away from the blanket cylinder 10 together with the inking unit 15.
  • the rubber cylinder 10 itself is placed against the impression cylinder 8.
  • the inking unit 23 and the dampening unit 24 have to be started for the direct flat printing on the printing cylinder 8.
  • the clutch 27 is engaged, via which a drive connection between the machine drive and the inking unit 23 or the dampening unit 24 is established. Then the machine can now be started.
  • the rubber cylinders 10, 15 are only set against the printing cylinder 8 when this paper sheet 2 is leading. Without paper, the printing ink would be transferred from the planographic printing plate 19 to the blanket cylinders 10, 15 and, conversely, the printing ink from the second printing unit 15 to 18 to the planographic printing plates 19.
  • the printing cylinder 8 takes two paper sheets 2 in succession with its grippers 7 and transfers them to the delivery chain conveyor 5 after the printing process.
  • the paper sheet 2 lies flat on a planographic printing plate 19 and is pressed against it by the rubber cylinders 10, 15 . While no print image is transferred from the blanket cylinder 10, the plain print image is printed on the top of the paper sheet 2 via the blanket cylinder 15. From the planographic printing plate 19, the counterprint image is printed directly onto the underside of the paper sheet 2.
  • the pressure conditions are set differently than in the pressure zone between the pressure cylinder 8 and the rubber cylinder 15.
  • the pressure supply is increased as much as it is for a high quality direct Flat printing is necessary.
  • the printing zone between the impression cylinder and the blanket cylinder 10 conditions for the execution of the counterprint in the method of direct planographic printing are thus specifically generated.
  • the surface printing can be done in the offset printing process without restrictions.
  • the print supply can be optimally matched to offset printing.
  • the forces for pulling the paper sheet 2 off the ink-carrying printing surfaces will mutually reduce after the second printing zone.
  • the greater adhesive force on the rubber cylinder 15 is reduced by the inherently smaller adhesive force on the pressure plate 19.
  • the tear-off angle on the blanket cylinder 15 is thus substantially reduced or the negative effect of the tendency to curl by pulling off the paper sheet 2 from the blanket cylinder 15 or the planographic printing plate 19 is largely eliminated.
  • the entire printing process runs in three stages. First the direct flat printing takes place, then the offset printing and finally the paper sheet 2 is separated from the printing surfaces.
  • the importance of the register for the perfecting is known and plays a very special role here.
  • the position of the printed image from the direct planographic printing to the paper is always the same, since the paper sheet 2 is placed directly on the planographic printing plate 19.
  • both the position and the size of the printed image on the face side can be changed. These are dependent on the cylinder lifts and the angular position on the rubber cylinder 15 or plate cylinder 16. It is necessary that if the prints on the face side and the back side are congruent, the start and length of the print match.
  • the location of the start of printing can be changed in the usual way by measures in the drive that as they are also known from multi-color machines and how they must also be present in this machine in order to produce the register between the first and the second printing unit.
  • a change in the angular position of the cylinder is achieved, for example, by axial displacement of helical toothed drive gears.
  • the adjustment of the printing length between the front printing and the back printing is then carried out by changing the cylinder lifts on the rubber cylinder 15 or on the plate cylinder 16 or on the printing cylinder 8.
  • the length of the front printing is changed, while, as already described, the length of the back printing always remains the same.
  • the printing length of the face printing must be matched to that of the reverse printing. It is not possible to adapt the print length of the backprint to that of the face print.
  • the plate cylinder 11 of the first printing unit together with its inking unit 12 and the dampening unit 13, is moved away from the blanket cylinder 10. So it runs empty, as well as the inking unit 12 and the dampening unit 13 when they are not coupled to the clutch 14.
  • the inking unit 12 must be provided with a lubricating fluid, as otherwise roller damage cannot be avoided.
  • roller separation is often carried out at a standstill.
  • the inking unit 13 and the dampening unit 14 in the first printing unit are switched off from the plate cylinder 11 and separated from the drive of the sheet-fed offset printing press 1 with the coupling 14.
  • the plate cylinder 11 can now also be placed on the rubber cylinder 10 which, as in the first version of the mode of operation, is again placed on the impression cylinder 8. It makes sense to leave an old plate or a corresponding elevator on the plate cylinder 11 and let it run as a support cylinder with the rubber cylinder 10.
  • the inking unit 13 and the dampening unit 14 no longer run in the perfecting mode and therefore do not have to be specially equipped for dry running. This saves drive power and operating effort and damage is avoided.
  • the printing process corresponds to the first version of the operating mode.
  • the cylinder lifts must be set up as well as there.
  • the control of the machine or the circuit for initiating the printing process is somewhat simplified here, since the cylinders 10, 11 of the first printing unit are activated in the usual way for the printing process.
  • the settlement between the rubber cylinders and the pressure cylinder 8 must now be considered in more detail. It plays a special role in the process of direct planographic printing.
  • the criterion for direct planographic printing must be taken into account that the printing area is reduced due to irregularities in the paper surface: This requires a higher print supply in order to obtain a sufficiently good print image.
  • it also plays a role that when the blanket cylinder 10 is placed against the impression cylinder 8, the blanket 30 is deformed, which leads to flexing movements during the printing process. It is important to ensure that there are no relative movements in the printing zone between the paper sheet 2 and the flat: printing plates 19. Both conditions affect the diameter ratios between the blanket cylinder 10 and the impression cylinder 8. In order to achieve a complete and even printout, it is necessary to position the rubber cylinder 10 at least 0.1 mm more strongly on the printing cylinder 8 than is customary in offset printing.
  • the diameter ratios between the Rubber cylinders 8 should be chosen so that when changing. the sheet-fed offset printing machine 1 does not require any change in the handling of the two-color perfecting. In connection with what has been said for the different modes of operation, it is clear that this is readily possible, since changes in the printing length are still possible by changing the elevator on the plate cylinder 11 of the first printing unit.
  • the diameter of the printing cylinder 8 should therefore be placed in a range which allows the printing lengths generated by the plate cylinders 11, 16 of the two upper printing units 10 to 13, 15 to 18 to be easily matched to one another. In practice, this means that the printing length should be corrected mainly via the upper plate cylinders 11, 16 and less by placing the planographic printing plates 19 on the printing cylinder 8.
  • the printing press can be easily switched from face and back printing without special turning devices or gear measures being necessary for controlling the press.
  • the print runs in one gripper closure.
  • the printing processes support each other in particular in the effect on the curl of the papers and in this way have no negative influence on the register or the register of the prints.

Claims (6)

1. Procédé pour réaliser une impression à retiration sur des feuilles de papier, dans lequel un côté est imprimé selon le procédé d'impression offset et l'autre côté selon le procédé d'impression à plat directe, et pour lequel, dans une machine imprimante offset à feuilles (1), du type à cinq cylindres, une ou plusieurs plaques d'impression (19), appropriées pour l'impression à plat directe, sont tendues sur le cylindre d'impression (8) conformément à sa proportion par rapport aux .cylindres porte-blanchet (10, 15), caractérisé en ce que le premier groupe d'impression (10 à 13) est réglé de sorte qu'il ne transfère aucune image imprimée, le cylindre porte-blanchet (10) étant cependant placé contre le cylindre d'impression (8), en ce que, à cet effet, le diamètre effectif (d) du premier cylindre porte-blanchet (10) est légèrement plus petit que cela est conforme à sa proportion par rapport au cylindre d'impression (8) et le réglage de la pression entre le premier cylindre porte-blanchet (10) et le cylindre d'impression (8) est plus grand que dans le second groupe d'impression (15 à 18) prévu pour l'impression offset, le processus d'impression étant commandé de façon connue en soi.
2. Procédé selon la revendication 1, caractérisé en ce que le diamètre (d) du premier cylindre porte-blanchet (10) par rapport au diamètre effectif (D) du cylindre d'impression (8) avec la plaque d'impression (19) tendue et des feuilles d'habillage et par rapport au second cylindre porte-blanchet (15) est plus faible de 0,2 à 0,4 mm, en ce que le réglage de la pression entre le premier cylindre porte-blanchet (10) et le cylindre d'impression (8) est augmenté d'au moins 0,1 mm par rapport au réglage de la pression entre le second cylindre porte-blanchet (15) et le cylindre d'impression (8), de l'encre d'imprimerie ou du milieu de mouillage n'étant pas introduit dans le premier groupe d'impression (10 à 13).
3. Procédé selon les revendications 1 ou 2, caractérisé en ce que le premier cylindre porte-plaque (11) avec son unité d'encrage (12) et son unité de mouillage (13) est séparé du premier cylindre porte-blanchet (10), et en ce que le premier cylindre porte-blanchet (10), indépendamment de cela, est placé contre le cylindre d'impression (8), de sorte qu'il agit en tant que presseur pour la retiration ayant lieu en impression à plat directe.
4. Procédé selon les revendications 1 ou 2, caractérisé en ce que l'unité d'encrage (12) et l'unité de mouillage (13) sont séparées du premier cylindre porte-plaque (11) et découplées de l'entraînement de la machine imprimante offset à feuilles (1) par l'intermédiaire d'un embrayage (14), en ce que le premier cylindre porte-plaque (11) recouvert d'une plaque d'impression offset (28) est placé contre le premier cylindre porte-blanchet (10) et en ce que le premier cylindre porte-blanchet (10) est placé contre le cylindre d'impression (8), de sorte que le premier cylindre porte-blanchet (10) agit en tant que presseur pour la retiration ayant lieu en impression à piat directe et le premier cylindre porte-plaque (11) agit en tant que cylindre d'appui pour le premier cylindre porte-blanchet (10).
5. Machine imprimante pour la mise en oeuvre du procédé selon une ou plusieurs des revendications 1 à 4, dans laquelle le cylindre d'impression (8) de la machine imprimante offset à feuilles (1) est muni d'une ou plusieurs rangées de pinces pour le transport de feuilles d'impression et le cylindre d'impression est muni d'un nombre, correspondant au nombre des rangées de pinces (7), de dispositifs de serrage de plaques (20, 21) pour serrer et tendre des plaques (19) d'impression à plat, des unités d'encrage (23) et de mouillage (24) étant agencées sur le cylindre d'impression (8), lesquelles peuvent être couplées et placées ensemble contre le cylindre d'impression (8), en tant qu'unité modulaire (25), caractérisée en ce que des dispositifs sont prévus sur le premier groupe d'impression (10 à 13), pour y agir lorsque le cylindre porte-blanchet (10) est placé contre le cylindre d'impression (8), de sorte qu'il ne transfère aucune image imprimée dans le processus d'impression.
6. Machine selon la revendication 5; caractérisée en ce que le cylindre d'impression (8) a un diamètre double de celui des cylindres porte-blanchet (10, 15), en ce que, sur le cylindre d'impression (8), sont prévues deux rangées de pinces (7) et deux dispositifs de serrage de plaques (20, 21) pour serrer et tendre, en ce que l'unité modulaire (25) des unités d'encrage (23) et de mouillage .(24) est fixée, de façon déplaçable, sur un dispositif mobile (26) agissant dans les deux sens, orienté radialement par rapport au cylindre d'impression, sur le bâti de la machine imprimante offset à feuilles (1), et en ce que, dans l'entraînement des unités d'encrage (12) et de mouillage (13) du premier groupe d'impression, est agencé un embrayage (14) et, dans l'entraînement des unités d'encrage (23) et de mouillage (24) dans l'unité modulaire (25), est agencé un embrayage (27).
EP84114948A 1984-01-30 1984-12-07 Procédé d'impression à retiration et machine d'impression offset à feuilles pour la mise en oeuvre du procédé Expired - Lifetime EP0150355B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84114948T ATE50731T1 (de) 1984-01-30 1984-12-07 Verfahren zum schoen- und widerdruck, sowie bogen- offset-druckmaschine zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843403065 DE3403065A1 (de) 1984-01-30 1984-01-30 Verfahren und vorrichtung an einer bogenoffsetdruckmaschine fuer schoen- und widerdruck
DE3403065 1984-01-30

Publications (3)

Publication Number Publication Date
EP0150355A2 EP0150355A2 (fr) 1985-08-07
EP0150355A3 EP0150355A3 (en) 1987-07-29
EP0150355B1 true EP0150355B1 (fr) 1990-03-07

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EP84114948A Expired - Lifetime EP0150355B1 (fr) 1984-01-30 1984-12-07 Procédé d'impression à retiration et machine d'impression offset à feuilles pour la mise en oeuvre du procédé

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US (1) US4603631A (fr)
EP (1) EP0150355B1 (fr)
JP (1) JPS60180842A (fr)
AT (1) ATE50731T1 (fr)
DE (1) DE3403065A1 (fr)

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Also Published As

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DE3403065A1 (de) 1985-08-08
DE3403065C2 (fr) 1987-06-11
US4603631A (en) 1986-08-05
EP0150355A3 (en) 1987-07-29
JPS60180842A (ja) 1985-09-14
ATE50731T1 (de) 1990-03-15
EP0150355A2 (fr) 1985-08-07

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