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EP0406157B1 - Platen printing machine for printing security paper - Google Patents

Platen printing machine for printing security paper Download PDF

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Publication number
EP0406157B1
EP0406157B1 EP90810233A EP90810233A EP0406157B1 EP 0406157 B1 EP0406157 B1 EP 0406157B1 EP 90810233 A EP90810233 A EP 90810233A EP 90810233 A EP90810233 A EP 90810233A EP 0406157 B1 EP0406157 B1 EP 0406157B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
inking
collector
intaglio
printing machine
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
EP90810233A
Other languages
German (de)
French (fr)
Other versions
EP0406157A1 (en
Inventor
Gualtiero Giori
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.)
KBA Notasys SA
Original Assignee
De la Rue Giori SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by De la Rue Giori SA filed Critical De la Rue Giori SA
Publication of EP0406157A1 publication Critical patent/EP0406157A1/en
Application granted granted Critical
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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
    • B41F31/00—Inking arrangements or devices
    • B41F31/30—Arrangements for tripping, lifting, adjusting, or removing inking rollers; Supports, bearings, or forks therefor
    • B41F31/302—Devices for tripping inking devices as a whole
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F11/00—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F11/00—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination
    • B41F11/02—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination for securities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/02—Rotary intaglio printing presses for multicolour printing

Definitions

  • the invention relates to an intaglio machine for printing sheet or reel of security papers according to the preamble of claim 1.
  • This known machine therefore has a relatively complicated configuration because of the presence of a device indirect inking and at least one direct inking device.
  • this machine requires a very exact and careful adjustment of the collector-inking cylinder relative to the plate cylinder on the one hand and of the inking roller relative to the plate cylinder and the collector-inking cylinder on the other hand, to arrive at a correct register between the various parts of the image to be printed.
  • the object of the present invention is to produce a new machine of a simplified construction, capable of ensuring totally intaglio printing, and in a single pass, of valuable paper having a finely engraved multicolored security background, and a deeply engraved main drawing; in this machine, the adjustment of the register between the elements inking the safety background and the main design is greatly simplified.
  • the same areas inked on the collector-inking cylinder always come into contact exactly with the same areas of the same engraved plate; on the other hand, the diameter of the plate cylinder and the collector-inking cylinder are relatively large since the plate cylinder must generally carry at least two engraved printing plates, preferably three or four engraved plates.
  • the diameter is for example 840 mm. Thanks to the large diameter of these two cylinders, the contact strip for good inking can be obtained with a lower compression force than with a smaller diameter collecting cylinder and, in addition, the separation of the contact areas immediately after the ink transfer is not as abrupt as with a collecting cylinder - smaller ink pad.
  • the machine shown comprises a printing cylinder 3, a plate cylinder 4 which cooperates with it and which has the same diameter as it, and a collector-inking cylinder 5 in contact with the plate cylinder 4.
  • the plate cylinder 4 is provided with several engraved printing plates, regularly distributed. In the case considered, it carries three plates and has a diameter of 840 mm.
  • the collector-inking cylinder 5, which has an elastic surface, has the same diameter as the plate cylinder 4 and is, in the example considered, like the printing cylinder 3, with three blankets.
  • Along the periphery of the collector-inking cylinder 5 and in contact therewith are mounted color selector cylinders 7, each being inked by its own inking device 8.
  • the direction of rotation of the different cylinders is represented by arrows in the drawing.
  • the three mentioned cylinders 3, 4 and 5 as well as the color selector cylinders 7 are installed in a main frame 6.
  • the collector-inking cylinder 5 and the selector cylinders 7 can also be installed in a mobile carriage which can be separated from the frame main 6.
  • the main design to be printed formed by sizes of variable dimensions and relatively deep, with a depth of up to 250 to 300 microns, and the safety bottom formed by very fine sizes, especially consisting of very fine lines or even dots, these sizes being less deep than those constituting the main design.
  • a wiping device 10 which cleans the surface of the engraved plates outside their sizes and which compresses the ink in sizes.
  • an automatic washing device 11 for blankets which is put out of contact with this cylinder during the printing operation.
  • the collector-inking cylinder 5 comprises, as has been mentioned, three rubber blankets, as used for offset blanket cylinders. On this collector-inking cylinder 5 are transferred all the different colors for the complete inking of the engraved plates. This is why it cooperates with as many color selector cylinders 7 as there are different colors.
  • the collector-inking cylinder 5 cooperates with four color selector cylinders 7 whose surface is made of hard material, for example plastic, metal or hard rubber, each selector cylinder being sectioned so to present raised areas whose contours correspond exactly to those of the surfaces to be printed in the respective color. These raised areas are obtained by any known means, for example by laser cutting.
  • the surface of the color selector cylinders is hard, there is no limit as to the fineness of the design that one wants to obtain. It is even possible to create a safety background with not only very fine lines, but also dots, which until now has been impossible.
  • Each color selector cylinder 7 is associated with an inking device 8 comprising the inkwell proper and the color transfer rollers.
  • the lower inking device in order to make it more convenient for the user, further comprises two intermediate transfer rollers 8b and 8c between the inkwell cylinder 8a and the rollers 8d. All the inking devices 8 with the rollers are installed in a movable inking carriage 9 which can be separated from the main frame 6, this withdrawal position is indicated in phantom in the figure.
  • the collector-inking cylinder 5 and the color selector cylinders are installed in a separate mobile carriage, the mobile inking carriage 9 can of course be separated therefrom.
  • the ratio between the diameters of the color selector cylinders 7 and the collector-inking cylinder 5 is 1: 3.
  • the sheet-shaped paper is brought to the machine by a sheet feeder 1 and a transfer cylinder 2 which gives the sheets to the printing cylinder 3.
  • the paper held on this cylinder by clamps, passes between this cylinder and the plate cylinder 4 where it receives the impression, and it is then transported by another transfer cylinder 12 on a transport device 13.
  • the procedure is as follows: one of the selector cylinders 7 not yet sectioned is mounted on the machine; then the printing plate is mounted on the plate cylinder 4 and ink and wiped; its image is then transferred, via the collector-inking cylinder 5, to the selector cylinder 7, so that the image of the plate remains printed on this cylinder which has not yet been cut.
  • the selector cylinder 7 is then removed from the machine and the image of the plate is used to cut the surface by any suitable means.
  • the image of the plate serves as a basis for coordinates to be introduced into the laser machine so that the cut perfectly follows the design in register with the plate.
  • the same operation is naturally repeated for the other selector cylinders 7 representing the other colors. Under these conditions, we arrive at an automatic register of the inking of the security background and the main design.
  • the arrangement of the machine is preferably such that the line connecting the axes of the printing cylinder 3 and the plate cylinder 4 is perpendicular to the line connecting the axes of the plate cylinder 4 and the collector-inking cylinder 5 and that the printing cylinder 3 is situated at least approximately vertically above the plate cylinder 4. Under these conditions, even if the plate cylinder were to yield to the bending of a few fractions of millimeters, due to the large pressure required for intaglio printing, this would in no way interfere with the collector-inking cylinder 5.
  • collector-inking cylinder 5 instead of having individual blankets, is provided with a flexible, continuous and smooth surface, especially if it is a spool printing machine.
  • the diameter of the collector-inking cylinder 5 has a diameter equal to twice, even three times, the diameter of the plate cylinder 4, if a reduced dimension of the latter allows, for practical reasons, a such size of the collector-inking cylinder 5. This would give even more room to install a greater number of color-selecting cylinders, with their inking device.
  • the number of blankets on the collector-inking cylinder 5 is twice, respectively three times, the number of plates on the plate cylinder 4.
  • the invention is not limited to the embodiment which has just been written, but also covers different embodiments in particular as regards the number of printing plates and the number of colors printed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Printing Methods (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Credit Cards Or The Like (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Undergarments, Swaddling Clothes, Handkerchiefs Or Underwear Materials (AREA)
  • Coloring (AREA)

Abstract

The intaglio printing machine comprises a plate cylinder (4) with a plurality of engraved printing plates equipped with intaglio cuts representing the elements of a main design and with less deep and finer intaglio cuts representing the elements of a safety background, an impression cylinder (3), a wiping device (10) and a multicolor inking system. This inking system consists of a collector inking cylinder (5) having an elastic surface interacting with the engraved plates mounted on the plate cylinder (4) and having the same diameter as this. The collector inking cylinder (5) is inked by as many selective color inking cylinders (7) as there are colors to be printed, these selective color inking cylinders (7) having reliefs corresponding to the colored zones of the safety background and of the main design, an inking device (8) being associated with each selective color inking cylinder (7). If appropriate, the diameter of the collector inking cylinder can also be double or triple the diameter of the plate cylinder.

Description

L'invention concerne une machine taille-douce pour l'impression à la feuille ou à la bobine des papiers valeurs selon le préambule de la revendication 1.The invention relates to an intaglio machine for printing sheet or reel of security papers according to the preamble of claim 1.

Afin d'augmenter le facteur de sécurité contre les falsifications des papiers valeurs de toute sorte, on a été amenés à fabriquer des papiers valeurs entièrement au moyen du procédé taille-douce, car il est beaucoup plus difficile de falsifier un papier valeur produit totalement en taille-douce, donc également pour les fonds de sécurité.In order to increase the security factor against falsification of security papers of all kinds, it has been necessary to manufacture security papers entirely by means of the intaglio process, since it is much more difficult to falsify a security paper produced entirely in intaglio, therefore also for security funds.

Pour cette raison, la demanderesse a déjà proposé dans le document EP-B 091 709 une machine taille-douce telle que décrite dans le préambule de la revendication 1. Dans cette machine connue, on a prévu un cylindre collecteur-encreur d'un diamètre inférieur à celui du cylindre porte-plaques et ce cylindre collecteur-encreur, avec les cylindres sélecteurs des couleurs qui lui sont associés, n'encre sur la plaque d'impression que des tailles moins profondes qui représentent le fond de sécurité. Pour l'encrage des tailles profondes représentant le dessin principal, cette machine est équipée d'un rouleau encreur conventionnel muni d'un dispositif d'encrage pour l'encrage direct de la plaque. En effet, on a cru que pour remplir correctement les tailles profondes d'un dessin principal il était indispensable d'utiliser un encrage direct avec une pression relativement forte du rouleau encreur contre la plaque.For this reason, the applicant has already proposed in document EP-B 091 709 an intaglio machine as described in the preamble of claim 1. In this known machine, a collector-inking cylinder with a diameter is provided lower than that of the plate cylinder and this collector-ink cylinder, with the color selector cylinders associated with it, only ink on the printing plate the shallower sizes which represent the security background. For inking the deep sizes representing the main design, this machine is equipped with a conventional inking roller provided with an inking device for the direct inking of the plate. Indeed, it was believed that to correctly fill the deep sizes of a main design it was essential to use direct inking with a relatively strong pressure of the inking roller against the plate.

Cette machine connue a donc une configuration relativement compliquée à cause de la présence d'un dispositif d'encrage indirect et d'au moins un dispositif d'encrage direct. En outre, cette machine nécessite un ajustement très exact et soigneux du cylindre collecteur-encreur par rapport au cylindre porte-plaques d'une part et du rouleau encreur par rapport au cylindre porte-plaques et au cylindre collecteur-encreur d'autre part, pour arriver à un registre correct entre les diverses parties de l'image à imprimer.This known machine therefore has a relatively complicated configuration because of the presence of a device indirect inking and at least one direct inking device. In addition, this machine requires a very exact and careful adjustment of the collector-inking cylinder relative to the plate cylinder on the one hand and of the inking roller relative to the plate cylinder and the collector-inking cylinder on the other hand, to arrive at a correct register between the various parts of the image to be printed.

La présente invention a pour but de réaliser une nouvelle machine d'une construction simplifiée, apte à assurer l'impression totalement en taille-douce, et en un seul passage, d'un papier valeur ayant un fond de sécurité multicolore finement gravé, et un dessin principal profondément gravé; dans cette machine, l'ajustement du registre entre les éléments encrant le fond de sécurité et le dessin principal étant largement simplifié.The object of the present invention is to produce a new machine of a simplified construction, capable of ensuring totally intaglio printing, and in a single pass, of valuable paper having a finely engraved multicolored security background, and a deeply engraved main drawing; in this machine, the adjustment of the register between the elements inking the safety background and the main design is greatly simplified.

A cet effet, la machine selon l'invention est caractérisée par la clause caractérisante de la revendication 1.To this end, the machine according to the invention is characterized by the characterizing clause of claim 1.

Par les mesures selon l'invention, on arrive à deux effets favorables: d'une part, les mêmes zones encrées sur le cylindre collecteur-encreur viennent toujours en contact exactement avec les mêmes zones de la même plaque gravée; d'autre part, le diamètre du cylindre porte-plaques et du cylindre collecteur-encreur sont relativement grands puisque le cylindre porte-plaques doit en général porter au moins deux plaques d'impression gravées, préférablement trois ou quatre plaques gravées. Pour un cylindre porte-plaques portant trois plaques, le diamètre est par exemple de 840 mm. Grâce au grand diamètre de ces deux cylindres, la bande de contact pour un bon encrage peut être obtenue avec une force de compression plus petite qu'avec un cylindre collecteur-encreur d'un diamètre plus petit et, de plus, la séparation des zones de contact immédiatement après le transfert de l'encre n'est pas aussi brusque qu'avec un cylindre collecteur-encreur plus petit.By the measures according to the invention, two favorable effects are achieved: on the one hand, the same areas inked on the collector-inking cylinder always come into contact exactly with the same areas of the same engraved plate; on the other hand, the diameter of the plate cylinder and the collector-inking cylinder are relatively large since the plate cylinder must generally carry at least two engraved printing plates, preferably three or four engraved plates. For a plate cylinder carrying three plates, the diameter is for example 840 mm. Thanks to the large diameter of these two cylinders, the contact strip for good inking can be obtained with a lower compression force than with a smaller diameter collecting cylinder and, in addition, the separation of the contact areas immediately after the ink transfer is not as abrupt as with a collecting cylinder - smaller ink pad.

Il s'est révélé que de ces deux effets découlent plusieurs avantages surprenants:

  • Le cylindre collecteur-encreur permet non seulement de remplir correctement et complètement les tailles fines, représentant le fond de sécurité, mais aussi les tailles plus profondes représentant le dessin principal, et même, comme on a pu le constater, des tailles profondes allant jusqu'à 250 à 300 µ, cela représentant une profondeur presque deux fois supérieure à celle généralement utilisée jusqu'ici lors de l'encrage direct des dessins principaux. Il semble que cet avantage surprenant est dû au fait qu'au cours de l'opération, il se forme sur la périphérie du cylindre collecteur-encreur une sorte de relief d'encre qui est suffisant pour remplir les tailles les plus profondes et qui est toujours renouvelé au moyen de l'encrage par les cylindres sélecteurs des couleurs. On avait toujours été convaincus jusqu'ici que, pour obtenir un remplissage correct des tailles profondes, il était absolument nécessaire d'avoir un rouleau encreur qui touche directement la plaque avec une pression considérable. Ce préjugé a pu être surmonté par l'invention.
  • En outre, avec cet encrage indirect selon l'invention, le fait de pouvoir découper les cylindres sélecteurs des couleurs, en matière plus ou moins dure, de façon très fine et très précise, et le fait que les plaques soient encrées avec le cylindre collecteur-encreur en matière plus ou moins souple, font que la quantité d'encre est le minimum nécessaire pour obtenir un encrage optimal, ce qui représente une économie non négligeable d'encre par rapport à un encrage direct, donc moins d'encre à essuyer sur la surface des plaques et par conséquent on décharge ainsi le dispositif d'essuyage, ce qui est très important.
  • Un autre avantage très important est qu'une fois que l'ajustage de tous les cylindres sélecteurs des couleurs par rapport au cylindre collecteur-encreur et aux plaques a été effectué, il existe un registre automatique entre l'encrage du dessin principal et du fond de sécurité et tout autre ajustement qui était nécessaire jusqu'à aujourd'hui est supprimé.
  • Etant donné la grandeur du cylindre collecteur-encreur, il y a davantage de place le long de sa périphérie pour installer un plus grand nombre de cylindres sélecteurs des couleurs, préférablement quatre, et même cinq. C'est pourquoi, il est bien possible d'utiliser au moins un cylindre sélecteur des couleurs pour encrer le dessin principal et les trois ou quatre autres pour encrer d'une façon multicolore le fond de sécurité.
  • On supprime bien entendu le dispositif d'encrage direct, ce qui rend la construction et l'entretien de la machine beaucoup plus facile.
It has been found that from these two effects arise several surprising advantages:
  • The collector-inking cylinder allows not only to fill correctly and completely the fine sizes, representing the safety background, but also the deeper sizes representing the main design, and even, as we have seen, deep sizes up to at 250 to 300 µ, this representing a depth almost twice as much as that generally used up to now during the direct inking of the main drawings. It seems that this surprising advantage is due to the fact that during the operation, a sort of ink relief is formed on the periphery of the collector-inking cylinder which is sufficient to fill the deepest sizes and which is always renewed by inking with the color selector cylinders. We had always been convinced until now that, to obtain a correct filling of the deep sizes, it was absolutely necessary to have an ink roller which directly touches the plate with a considerable pressure. This prejudice could be overcome by the invention.
  • In addition, with this indirect inking according to the invention, the fact of being able to cut out the color selector cylinders, of more or less hard material, in a very fine and very precise manner, and the fact that the plates are inked with the collecting cylinder. -inker in more or less flexible material, make the quantity of ink is the minimum necessary to obtain an optimal inking, which represents a significant economy of ink compared to a direct inking, therefore less ink to be wiped on the surface of the plates and therefore discharging the wiping device, which is very important.
  • Another very important advantage is that once the adjustment of all the color selector cylinders in relation to the collector-inking cylinder and to the plates has been carried out, there is an automatic register between the inking of the main design and the background. security and any other adjustments that were necessary until today are deleted.
  • Given the size of the collector-inking cylinder, there is more room along its periphery to install a greater number of color selector cylinders, preferably four, and even five. This is why it is possible to use at least one color selector cylinder to ink the main design and the other three or four to ink the security background in a multicolored manner.
  • Of course, the direct inking device is eliminated, which makes the construction and maintenance of the machine much easier.

L'invention sera décrite à titre d'exemple non limitatif, en se référant au dessin annexé dont la figure unique représente, schématiquement, une machine taille-douce pour l'impression à la feuille, réalisée conformément à la présente invention.The invention will be described by way of nonlimiting example, with reference to the appended drawing, the single figure of which schematically represents an intaglio machine for sheet printing, produced in accordance with the present invention.

La machine représentée comprend un cylindre d'impression 3, un cylindre porte-plaques 4 qui coopère avec celui-ci et qui a le même diamètre que lui, et un cylindre collecteur-encreur 5 en contact avec le cylindre porte-plaques 4. Le cylindre porte-plaques 4 est muni de plusieurs plaques d'impression gravées, régulièrement distribuées. Dans le cas considéré, il porte trois plaques et a un diamètre de 840 mm. Le cylindre collecteur-encreur 5, qui a une surface élastique, a le même diamètre que le cylindre porte-plaques 4 et est, dans l'exemple considéré, muni comme le cylindre d'impression 3, de trois blanchets. Le long de la périphérie du cylindre collecteur-encreur 5 et en contact avec celui-ci sont montés des cylindres sélecteurs des couleurs 7, chacun étant encré par son propre dispositif d'encrage 8.The machine shown comprises a printing cylinder 3, a plate cylinder 4 which cooperates with it and which has the same diameter as it, and a collector-inking cylinder 5 in contact with the plate cylinder 4. The plate cylinder 4 is provided with several engraved printing plates, regularly distributed. In the case considered, it carries three plates and has a diameter of 840 mm. The collector-inking cylinder 5, which has an elastic surface, has the same diameter as the plate cylinder 4 and is, in the example considered, like the printing cylinder 3, with three blankets. Along the periphery of the collector-inking cylinder 5 and in contact therewith are mounted color selector cylinders 7, each being inked by its own inking device 8.

Le sens de rotation des différents cylindres est représenté par des flèches sur le dessin. Les trois cylindres mentionnés 3, 4 et 5 ainsi que les cylindres sélecteurs des couleurs 7 sont installés dans un bâti principal 6. Le cylindre collecteur-encreur 5 et les cylindres sélecteurs 7 peuvent aussi être installés dans un chariot mobile qui peut être séparé du bâti principal 6.The direction of rotation of the different cylinders is represented by arrows in the drawing. The three mentioned cylinders 3, 4 and 5 as well as the color selector cylinders 7 are installed in a main frame 6. The collector-inking cylinder 5 and the selector cylinders 7 can also be installed in a mobile carriage which can be separated from the frame main 6.

Sur les plaques d'impression gravées se trouvent gravés à la fois le dessin principal à imprimer, formé par des tailles de dimensions variables et relativement profondes, avec une profondeur allant jusqu'à 250 à 300 microns, et le fond de sécurité formé par des tailles très fines, surtout constituées par des lignes très fines ou même des points, ces tailles étant moins profondes que celles constituant le dessin principal.On the engraved printing plates are engraved both the main design to be printed, formed by sizes of variable dimensions and relatively deep, with a depth of up to 250 to 300 microns, and the safety bottom formed by very fine sizes, especially consisting of very fine lines or even dots, these sizes being less deep than those constituting the main design.

A la périphérie du cylindre porte-plaques 4 se trouve, à la suite du cylindre collecteur-encreur 5, dans le sens de rotation, un dispositif d'essuyage 10 qui nettoie la surface des plaques gravées en dehors de leurs tailles et qui comprime l'encre dans les tailles.At the periphery of the plate cylinder 4 is, following the collector-inking cylinder 5, in the direction of rotation, a wiping device 10 which cleans the surface of the engraved plates outside their sizes and which compresses the ink in sizes.

En outre, à la périphérie du cylindre collecteur-encreur 5 est prévu un dispositif de lavage automatique 11 des blanchets qui est mis hors contact de ce cylindre lors de l'opération d'impression.In addition, on the periphery of the collector-inking cylinder 5 is provided an automatic washing device 11 for blankets which is put out of contact with this cylinder during the printing operation.

Le cylindre collecteur-encreur 5 comporte, ainsi qu'il a été mentionné, trois blanchets de caoutchouc, comme utilisés pour des cylindres porte-blanchets offset. Sur ce cylindre collecteur-encreur 5 sont transférées toutes les différentes couleurs pour l'encrage complet des plaques gravées. C'est pourquoi il coopère avec autant de cylindres sélecteurs des couleurs 7 qu'il est prévu de couleurs différentes. Dans la forme d'exécution représentée, le cylindre collecteur-encreur 5 coopère avec quatre cylindres sélecteurs des couleurs 7 dont la surface est en matière dure, par exemple en matière plastique, en métal ou en caoutchouc durci, chaque cylindre sélecteur étant sectionné de façon à présenter des zones en relief dont les contours correspondent exactement à ceux des surfaces à imprimer dans la couleur respective. Ces zones en relief sont obtenues par tout moyen connu, par exemple par découpage au laser. Comme la surface des cylindres sélecteurs des couleurs est dure, il n'y a pas de limite en ce qui concerne la finesse du dessin que l'on veut obtenir. Il est même possible de réaliser un fond de sécurité présentant non seulement des lignes très fines, mais également des points, ce qui était irréalisable jusqu'à maintenant.The collector-inking cylinder 5 comprises, as has been mentioned, three rubber blankets, as used for offset blanket cylinders. On this collector-inking cylinder 5 are transferred all the different colors for the complete inking of the engraved plates. This is why it cooperates with as many color selector cylinders 7 as there are different colors. In the embodiment shown, the collector-inking cylinder 5 cooperates with four color selector cylinders 7 whose surface is made of hard material, for example plastic, metal or hard rubber, each selector cylinder being sectioned so to present raised areas whose contours correspond exactly to those of the surfaces to be printed in the respective color. These raised areas are obtained by any known means, for example by laser cutting. As the surface of the color selector cylinders is hard, there is no limit as to the fineness of the design that one wants to obtain. It is even possible to create a safety background with not only very fine lines, but also dots, which until now has been impossible.

Chaque cylindre sélecteur des couleurs 7 est associé à un dispositif d'encrage 8 comprenant l'encrier proprement dit et les rouleaux de transfert de la couleur. Le dispositif d'encrage inférieur, afin de le rendre plus commode à l'usager, comprend en outre deux rouleaux de transfert intermédiaires 8b et 8c entre le cylindre d'encrier 8a et les rouleaux 8d. Tous les dispositifs d'encrage 8 avec les rouleaux sont installés dans un chariot d'encrage mobile 9 qui peut être séparé du bâti principal 6, cette position de retrait est indiquée en traits mixtes sur la figure. Dans le cas où, comme mentionné, le cylindre collecteur-encreur 5 et les cylindres sélecteurs des couleurs sont installés dans un chariot mobile séparé, le chariot d'encrage mobile 9 peut bien sur être séparé de celui-ci.Each color selector cylinder 7 is associated with an inking device 8 comprising the inkwell proper and the color transfer rollers. The lower inking device, in order to make it more convenient for the user, further comprises two intermediate transfer rollers 8b and 8c between the inkwell cylinder 8a and the rollers 8d. All the inking devices 8 with the rollers are installed in a movable inking carriage 9 which can be separated from the main frame 6, this withdrawal position is indicated in phantom in the figure. In the case where, as mentioned, the collector-inking cylinder 5 and the color selector cylinders are installed in a separate mobile carriage, the mobile inking carriage 9 can of course be separated therefrom.

Dans la forme d'exécution représentée sur la figure, le rapport entre les diamètres des cylindres sélecteur des couleurs 7 et du cylindre collecteur-encreur 5 est 1:3.In the embodiment shown in the figure, the ratio between the diameters of the color selector cylinders 7 and the collector-inking cylinder 5 is 1: 3.

Le papier en forme de feuilles est amené à la machine par un dispositif d'alimentation des feuilles 1 et un cylindre de transfert 2 qui donne les feuilles au cylindre d'impression 3. Le papier, tenu sur ce cylindre par des pinces, passe entre ce cylindre et le cylindre porte-plaques 4 où il reçoit l'impression, et il est ensuite transporté par un autre cylindre de transfert 12 sur un dispositif de transport 13.The sheet-shaped paper is brought to the machine by a sheet feeder 1 and a transfer cylinder 2 which gives the sheets to the printing cylinder 3. The paper, held on this cylinder by clamps, passes between this cylinder and the plate cylinder 4 where it receives the impression, and it is then transported by another transfer cylinder 12 on a transport device 13.

Il s'est révélé que la pression entre le cylindre collecteur-encreur 5 et le cylindre porte-plaques 4 peut être plus faible que dans le cas d'un encrage direct au moyen d'un rouleau encreur et que, malgré cette faible pression, le remplissage complet des tailles est garanti.It has been found that the pressure between the collector-inking cylinder 5 and the plate-carrying cylinder 4 can be lower than in the case of direct inking by means of an inking roller and that, despite this low pressure, full filling of the sizes is guaranteed.

De même, entre les cylindres sélecteurs des couleurs 7 et le cylindre collecteur-encreur 5 on n'a besoin que d'une faible pression, réduite pratiquement à un simple contact, ce qui évite une déformation des zones très fines découpées sur les cylindres sélecteurs.Likewise, between the color selector cylinders 7 and the collector-inking cylinder 5, only a low pressure is required, which is reduced practically to a simple contact, which avoids deformation of the very fine zones cut out on the selector cylinders. .

Afin d'assurer un registre parfait entre les cylindres sélecteurs 7 sectionnés et les plaques d'impression gravées, on procède de la manière suivante: on monte sur la machine un des cylindres sélecteurs 7 non encore sectionné; ensuite on monte la plaque d'impression sur le cylindre porte-plaques 4 et on l'encre et l'essuie; on transfère ensuite son image, par l'intermédiaire du cylindre collecteur-encreur 5, sur le cylindre sélecteur 7, de façon telle que l'image de la plaque reste imprimée sur ce cylindre non encore sectionné. Le cylindre sélecteur 7 est ensuite démonté de la machine et l'image de la plaque est utilisée pour découper la surface par tout moyen approprié. Dans le cas où la découpe est obtenue au moyen d'un laser, l'image de la plaque sert comme base pour des coordonnées à introduire dans la machine laser afin que la découpe suive parfaitement le dessin en registre avec la plaque. On répète naturellement la même opération pour les autres cylindres sélecteurs 7 représentant les autres couleurs. Dans ces conditions, on arrive à un registre automatique de l'encrage du fond de sécurité et du dessin principal.In order to ensure a perfect register between the sectioned selector cylinders 7 and the engraved printing plates, the procedure is as follows: one of the selector cylinders 7 not yet sectioned is mounted on the machine; then the printing plate is mounted on the plate cylinder 4 and ink and wiped; its image is then transferred, via the collector-inking cylinder 5, to the selector cylinder 7, so that the image of the plate remains printed on this cylinder which has not yet been cut. The selector cylinder 7 is then removed from the machine and the image of the plate is used to cut the surface by any suitable means. In the case where the cut is obtained by means of a laser, the image of the plate serves as a basis for coordinates to be introduced into the laser machine so that the cut perfectly follows the design in register with the plate. The same operation is naturally repeated for the other selector cylinders 7 representing the other colors. Under these conditions, we arrive at an automatic register of the inking of the security background and the main design.

Comme cela se voit sur le dessin, l'agencement de la machine est préférablement tel que la ligne reliant les axes du cylindre d'impression 3 et du cylindre porte-plaques 4 est perpendiculaire à la ligne reliant les axes du cylindre porte-plaques 4 et du cylindre collecteur-encreur 5 et que le cylindre d'impression 3 est situé au moins approximativement verticalement au dessus du cylindre porte-plaques 4. Dans ces conditions, même si le cylindre porte-plaques devait céder à la flexion de quelques fractions de millimètres, due à la grande pression nécessaire pour imprimer en taille-douce, cela n'interfèrerait en rien le cylindre collecteur-encreur 5.As can be seen in the drawing, the arrangement of the machine is preferably such that the line connecting the axes of the printing cylinder 3 and the plate cylinder 4 is perpendicular to the line connecting the axes of the plate cylinder 4 and the collector-inking cylinder 5 and that the printing cylinder 3 is situated at least approximately vertically above the plate cylinder 4. Under these conditions, even if the plate cylinder were to yield to the bending of a few fractions of millimeters, due to the large pressure required for intaglio printing, this would in no way interfere with the collector-inking cylinder 5.

Il est aussi possible que le cylindre collecteur-encreur 5 au lieu d'avoir des blanchets individuels, soit muni d'une surface souple, continue et lisse, surtout s'il s'agit d'une machine d'impression à la bobine.It is also possible that the collector-inking cylinder 5 instead of having individual blankets, is provided with a flexible, continuous and smooth surface, especially if it is a spool printing machine.

On peut également prévoir que le diamètre du cylindre collecteur-encreur 5 ait un diamètre égal à deux fois, même trois fois, le diamètre du cylindre porte-plaques 4, si une dimension réduite de celui-ci permet, pour des raisons pratiques, une telle grandeur du cylindre collecteur-encreur 5. Cela donnerait encore plus de place pour installer un plus grand nombre de cylindres sélecteurs des couleurs, avec leur dispositif d'encrage. Dans ce cas, le nombre de blanchets sur le cylindre collecteur-encreur 5 est deux fois, respectivement trois fois, le nombre de plaques sur le cylindre porte-plaques 4.It is also possible to provide that the diameter of the collector-inking cylinder 5 has a diameter equal to twice, even three times, the diameter of the plate cylinder 4, if a reduced dimension of the latter allows, for practical reasons, a such size of the collector-inking cylinder 5. This would give even more room to install a greater number of color-selecting cylinders, with their inking device. In this case, the number of blankets on the collector-inking cylinder 5 is twice, respectively three times, the number of plates on the plate cylinder 4.

L'invention n'est pas limitée à la forme d'exécution qui vient d'être écrite, mais couvre également des formes d'exécution différentes notamment en ce qui concerne le nombre des plaques d'impression et le nombre de couleurs imprimées.The invention is not limited to the embodiment which has just been written, but also covers different embodiments in particular as regards the number of printing plates and the number of colors printed.

Claims (9)

  1. Sheetfed or webfed intaglio printing machine for currency papers, especially bank notes, comprising a plate cylinder (4) with several printing plates, an impression cylinder (3), a wiping device (10) and an inking system consisting of a collector inking cylinder (5) having an elastic surface interacting with the printing plates, of selective colour inking cylinders (7) having reliefs corresponding to the coloured zones to be printed in different colours and in contact with the periphery of the collector inking cylinder (5), and of an inking device (8) associated with each selective colour inking cylinder (7), characterized in that the diameter of the collector inking cylinder (5) is equal to N times the diameter of the plate cylinder (4), N being an integer between 1 and 3.
  2. Intaglio printing machine according to Claim 1, characterized in that the collector inking cylinder (5) is a blanket cylinder, and in that the ratio of the number of blankets to the number of printing plates is equal to the ratio of the said diameters.
  3. Intaglio printing machine according to Claims 1 or 2, characterized in that the diameter of the collector inking cylinder (5) is equal to the diameter of the plate cylinder (4).
  4. Intaglio printing machine according to one of Claims 1 to 3, characterized in that the plate cylinder (4) carries at least two, preferably three or four printing plates.
  5. Intaglio printing machine according to one of Claims 1 to 4, characterized in that there are at least three, preferably four selective colour inking cylinders (7).
  6. Intaglio printing machine according to one of Claims 1 to 5, in which the printing plates are equipped with intaglio cuts representing the elements of a main design and with less deep and finer intaglio cuts representing the elements of a safety background, characterized in that at least some of the intaglio cuts of the main design have a depth extending to 250 to 300 µ, and in which at least one selective colour inking cylinder transmits the ink to the collector inking cylinder (5) in order to ink the intaglio cuts representing the main design, while the other selective colour inking cylinders transmit the ink to the collector inking cylinder (5) in order to ink the intaglio cuts representing the multicolour safety background.
  7. Intaglio printing machine according to one of Claims 1 to 6, characterized in that the line connecting the axes of the impression cylinder (3) and of the plate cylinder (4) is perpendicular to the line connecting the axes of the plate cylinder (4) and the collector inking cylinder (5), and in that the impression cylinder (3) is located at least approximately vertically above the plate cylinder (4).
  8. Intaglio printing machine according to one of Claims 1 to 7, characterized in that the plate cylinder (4) and the impression cylinder (3) are installed in a main frame (6), in that the collector inking cylinder (5) and the selective colour inking cylinders (7) are installed in a first carriage, and in that the inking devices (8) are installed in a second carriage.
  9. Intaglio printing machine according to one of Claims 1 to 8, characterized in that on the periphery of the collector inking cylinder (5) is a device (11) for the automatic washing of the blankets or respectively of the flexible and continuous surface of this collector inking cylinder (5), the said washing device (11) being put out of contact with this cylinder during the printing operation.
EP90810233A 1989-06-29 1990-03-22 Platen printing machine for printing security paper Expired - Lifetime EP0406157B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2422/89 1989-06-29
CH242289 1989-06-29

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EP0406157A1 EP0406157A1 (en) 1991-01-02
EP0406157B1 true EP0406157B1 (en) 1994-05-18

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US (1) US5062359A (en)
EP (1) EP0406157B1 (en)
JP (1) JP2829099B2 (en)
KR (1) KR0154096B1 (en)
CN (1) CN1021309C (en)
AT (1) ATE105774T1 (en)
AU (1) AU630460B2 (en)
CA (1) CA2016372C (en)
DD (1) DD296041A5 (en)
DE (1) DE69008941T2 (en)
RU (1) RU1830003C (en)
UA (1) UA18593A1 (en)

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Also Published As

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AU630460B2 (en) 1992-10-29
RU1830003C (en) 1993-07-23
UA18593A1 (en) 1997-12-25
JP2829099B2 (en) 1998-11-25
CN1049125A (en) 1991-02-13
US5062359A (en) 1991-11-05
DE69008941D1 (en) 1994-06-23
KR910000380A (en) 1991-01-29
DD296041A5 (en) 1991-11-21
EP0406157A1 (en) 1991-01-02
CN1021309C (en) 1993-06-23
DE69008941T2 (en) 1994-12-15
KR0154096B1 (en) 1998-12-01
CA2016372A1 (en) 1990-12-29
CA2016372C (en) 1999-09-28
ATE105774T1 (en) 1994-06-15
AU5710490A (en) 1991-01-03
JPH0338347A (en) 1991-02-19

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