EP0889783A1 - Silk-screen printing machine - Google Patents

Silk-screen printing machine

Info

Publication number
EP0889783A1
EP0889783A1 EP97906079A EP97906079A EP0889783A1 EP 0889783 A1 EP0889783 A1 EP 0889783A1 EP 97906079 A EP97906079 A EP 97906079A EP 97906079 A EP97906079 A EP 97906079A EP 0889783 A1 EP0889783 A1 EP 0889783A1
Authority
EP
European Patent Office
Prior art keywords
screen
cylinder
printing
areas
machine according
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.)
Granted
Application number
EP97906079A
Other languages
German (de)
French (fr)
Other versions
EP0889783B1 (en
Inventor
Hans Wyssmann
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 EP0889783A1 publication Critical patent/EP0889783A1/en
Application granted granted Critical
Publication of EP0889783B1 publication Critical patent/EP0889783B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0804—Machines for printing sheets
    • B41F15/0809—Machines for printing sheets with cylindrical or belt-like screens

Definitions

  • the present invention relates to a screen printing machine, in particular of security papers, comprising for printing a first zone in a determined color, a printing cylinder and a screen cylinder.
  • the object of the present invention is to propose a screen printing machine for certain areas of a paper by at least two non-superimposed drawings and of different colors without having to go through an intermediate drying and with a relatively simple machine and less bulky than a multi-color screen printing installation used until now.
  • the screen printing machine according to the inven ⁇ tion ⁇ is characterized in that it comprises at least one second screen cylinder, that said second screen cylinder cooperating with the same cy ⁇ lindre printing and it is provided with means for printing at least one second zone in a color different from that of the first zone and outside this first zone, the machine being arranged so that the second screen cylinder does not does not come into contact with the printing cylinder on the area (s) im ⁇ primed by the first screen cylinder.
  • the second zone is printed by a screen cylinder provided with means for printing at least a second zone of the paper not yet printed and not touching the zone already printed by the first sieve holder cylinder.
  • the latter may be a conventional screen cylinder or, for example, like that proposed in the Swiss patent application No. 192 / 95-0 of the applicant.
  • the means with which the second screen cylinder is provided comprise at least one raised part on which a screen is disposed.
  • the means with which the second screen cylinder is provided comprise at least one raised part on which a screen is disposed.
  • the means with which the second screen cylinder is provided comprise at least one raised part on which a screen is disposed.
  • the screen of the first cylinder is designed to print several spaced zones in a given color, the design could be the same or different for each zone, the second cylinder also has several zones in relief. allowing to print the same or several sins in a second color in spaces left by the previous impression.
  • the machine can comprise several screen-carrying cylinders with relief means for successively printing and by means of a single printing cylinder non-superimposed areas of different colors, the reliefs of the different cylinders being arranged so that they do not come into contact during printing with the previously printed areas.
  • the raised areas of the cy ⁇ lindre or of each of the screen-holder cylinders have an axial shape extending parallel to the axis of the cy ⁇ lindre, along the surface thereof. which is arranged the sieve.
  • the doctor blade or the equivalent device is provided with a mechanism allowing its radial displacement in order to be able to follow the configuration on the inside of the periphery of the cylinder, in order to push the screen disposed on the part in re ⁇ lief of the cylinder and retract when by the rota ⁇ tion of the cylinder the recessed part comes against the doctor blade and so on.
  • the mechanism allowing the doctor blade to carry out these movements in the ra ⁇ dial direction is a cam rotating in synchronization with the screen holder cylinder and acting on the end of a lever, the other of which end is integral with the doctor blade.
  • the parts in re ⁇ lief are annular zones on which one applies that the sieve and in this case the doctor blade has the shape of a comb whose teeth are permanently inside the annular zones to push the ink through the screen with which these annular zones are fitted.
  • the second screen holder cy ⁇ is provided with an elastically deformable screen so that contact with the printing cylinder in line with the printing slot takes place only under the thrust means such as a doctor blade in this case having the shape of a comb whose teeth correspond to the areas to be printed by pushing the screen to come into contact with the impression cylinder, the space between the corresponding teeth to printed or unprinted areas with which the screen does not come into contact.
  • the thrust means such as a doctor blade in this case having the shape of a comb whose teeth correspond to the areas to be printed by pushing the screen to come into contact with the impression cylinder, the space between the corresponding teeth to printed or unprinted areas with which the screen does not come into contact.
  • the screen is provided with distance rings to the corresponding spaces between two consecutive areas to be printed preventing the screen from deforming and coming into contact with the printing cy ⁇ lindre.
  • the machine is a sheet printing machine comprising a printing cylinder with at least one notch housing the device for gripping the sheet, and the means for pushing the ink of each screen holder cylinder includes a mechanism for moving them away from the screen when a notch passes through the printing slot.
  • Figure 1 is a schematic side representation of an installation comprising a machine forming the object of the present invention.
  • Figure 2 is a schematic side view of a first embodiment of a screen cylinder pre ⁇ sensing parts in relief having the form of rings concentric with the cylinder.
  • Figure 3 is a side view of the doctor blade used in the screen cylinder of the first embodiment according to Figure 2.
  • Figure 4 is a schematic side view of a second embodiment of the screen cylinder pre ⁇ feeling parts in relief having the form of axial zones.
  • FIG. 5 is a side view of the doctor blade used in the screen cylinder of the second embodiment according to FIG. 4.
  • Figure 6 shows the assembly of the printing cylinder and the two screen cylinders according to a first embodiment.
  • Figure 7 is a representation similar to that of Figure 6 according to a second embodiment.
  • FIG. 8 is an overall schematic view allowing both to explain the operation of the first embodiment according to FIGS. 2, 3 and 6.
  • FIG. 9 is a representation similar to that of FIG. 8 to explain the operation of the second embodiment according to FIGS. 4, 5 and 7.
  • Figure 10 is a schematic side view of a third embodiment of the screen cylinder.
  • FIG. 11 is a side view of the doctor blade used with the screen cylinder of FIG. 10.
  • Figure 12 is an axial sectional view of a screen cylinder of a fourth embodiment of the screen cylinder.
  • FIG. 1 shows a complete installation comprising a machine for screen printing in two different colors, according to the invention.
  • the installation has a magazine 1 comprising the sheets to be printed, a feeder device 2 for transferring the sheets along the path 3 to a margin cylinder 4, a transfer cylinder 5 for bringing the sheets of paper onto a cylinder single printing 6, two screen cylinders 7 and 8 cooperating with the printing cylinder 6 and a chain clamp system 9 which transports the sheets to the magazines 10 for output of the sheets comprising, in this case, three Battery.
  • the sheets On the printing cylinder 6 which rotates in the direction of the arrow, the sheets first pass the first screen cylinder 7 where they are partially printed in a first color, then they pass the second screen cylinder 8 where they are printed in a different color in at least one non-superimposed area, therefore outside the areas printed by the first screen cylinder 7, without first drying the areas printed by the cylinder 7 is necessary.
  • printing is done by conventional means, that is to say that the ink is introduced inside each of the screen cylinders and during from the rotation of the cylinder it flows inside and is pushed by a corresponding doctor blade, or other equivalent device, to pass through the sieve showing the drawing to be printed.
  • the screen cylinder 8 has at least one raised part on which a screen is arranged allowing the printing of the second zone, the assembly being positioned and dimensioned so that the part or parts in relief of the screen cylinder 8 do not come into contact with the areas printed by the cylinder 7, which is of a construction as already proposed by the applicant.
  • the second screen cylinder 8 according to the present invention can be produced according to four different constructions, as shown in the following figures; this second screen cylinder carries, according to the first embodiment, the reference 18, according to the second embodiment, the reference 28, according to the third embodiment, the reference 48 and according to the fourth form of execution, reference 48 '.
  • Figure 2 shows, according to the first form of execution, a screen cylinder 18 provided with parts in re ⁇ lief 19 which have the form of concentric rings at cylinder 18, arranged axially spaced from each other, as best shown in Figure 8.
  • a doctor blade 12 Inside this screen cylinder 18 is installed a doctor blade 12, as illustrated in Figure 3, whose front edge is adapted to the shape of the inner periphery of the screen cylinder 18, and therefore has the shape of a pei ⁇ gne, whose teeth 12a correspond, both in size and in layout, to the annular parts 19 in relief to push the ink during printing through the screen covering the raised parts 19.
  • the screen cylinder 28 is mu ⁇ ni parts in relief in the form of axial zones 29, spaced from each other and extending over the entire length of the cylinder and on which is placed a screen.
  • the doctor blade 13 mounted inside this cylinder 28 is a conventional doctor blade as shown in FIG. 5, the front edge of which is straight. Because of the axial raised areas of the cylinder 28, this doctor blade 13 is provided with a device allowing it to retract as the cylinder 28 rotates to pass the recessed parts between the raised areas 29 .
  • FIGS. 6 and 8 in which the two screen cylinder 7 and 18 are shown schematically, as well as a sheet of printed paper 40 shown in FIG. 8 in development.
  • the diameter of the screen cylinder 7 and 18 is equal to one third of the diameter of the printing cylinder 6, the surface of which corresponds to three sheets.
  • a sheet 40 is shown in Figure 8 and has 5 x 9 ⁇ 45 bank note prints arranged in a row. transverse and longitudinal gages which must be completed by two zones of different color, to be seen, in the case under consideration, a first zone constituted by the character "a" and a second zone constituted by the character "B" .
  • the machine according to FIG. 6 comprises the printing cylinder 6 provided with three rows of pliers 31 housed in notches 30, said pliers 31 being intended to hold the front end of a sheet 40 which comes from the cylinder transfer 5 ( Figure 1) to pass in front of the two screen cylinders 7 and 18.
  • the screen cylinder 7 is of the type proposed in patent application CH 192 / 95-0, and allows the printing of 'a conventional manner of the character "a" in a color determined on each printing of bank note.
  • This cylinder 7 is provided on its axis with a cam 17 rotating with it and acting on a lever 15 in the form of a square, one of the ends of which is provided with a roller 16 corresponding to the cam 17, this bracket being under the action of a spring (not shown) which pushes it radially outside towards the sieve.
  • the top of the angle of the bracket 15 is articulated at a fixed point 14 while the other end of the lever is secured to the doctor blade 11.
  • the purpose of this cam 17 (as described in said request for bre ⁇ vet CH 192 / 95-0) is to move the doctor blade 11 away from the inner side of the screen, against the action of said spring, when the projecting part 17a of the cam 17 comes into contact with the roller 16 of the square 15.
  • doctor blade by other means in particular a hydraulic or pneumatic cylinder controlled by an electronic, electromechanical device, etc.
  • the paper 40 passes in front of the second screen holder cylinder 18 for printing the second area constituted by the character "B".
  • This cylinder 18 is provided with annular raised portions 19 on each of which is stretched a sieve with the print design, in this case the letter "B". It can be seen that the raised parts 19 of the cylinder 18 are offset laterally with respect to the printing areas of the cylinder 7 comprising the letter "a”.
  • the printing can be done in a single pass by means of the same printing cylinder and without waiting for the zones printed by the cylinder 7 to be dried beforehand.
  • This arrangement of the annular zones allows the printing of the zones offset perpendicular to the direction of movement of the paper 40.
  • doctor blade 12 Inside the screen cylinder 18 is the doctor blade 12, as illustrated in FIG. 3, in the shape of a pei ⁇ with teeth 12a; this doctor blade 12 is mounted, as in the case of the first screen cylinder 7, to one end of a bracket 21 articulated at its apex around a fixed axis 20 and carrying at its other end a roller 22 which is in permanent contact with the surface of a cam 23 provided with a projecting part 23a .
  • This cam 23 therefore has the same configuration as the cam 17 of the cylinder 7 and acts for the same purpose, except that the squeegee 12 is removed from the inner side of the screen when passing in front of the printing slot of one of the notches 30 of the printing cylinder 6.
  • the second embodiment according to FIGS. 7 and 9 allows the printing of the zones, in the form of characters "a” and "B", offset in the direction of movement of the sheets of paper 41 which again include 5 x 9 prints. of tickets.
  • the screen cylinder 7, with its doctor blade, its square and the cam 17, 17a, is identical to that of FIG. 6 and prints the first zones with the letter "a"; the printing cylinder 6 also has the same construction as that described in relation to FIG. 6.
  • the second screen cylinder 28 comprising axial raised areas 29 extending over its entire length is provided with a screen on each of the raised parts 29 for printing the letter "B" in another color than the letter "a". This impression is, as can be seen on sheet 41 (FIG. 9) printed, offset in the direction of movement of the paper.
  • the doctor blade 13 is controlled by a cam 27 fixed to the axis of the cylinder 28 and rotating in synchronism with the latter. This doctor blade 13 is fixed to one end of a bracket 25 articulated at its top on a fixed axis 24 and provided at its other end with a roller 26 in permanent contact with a cam 27.
  • this cam 27 reproduced, at a smaller scale, the con- turn of the screen cylinder 28, in negative, for per ⁇ put the guide of the doctor blade 13 inside said cylinder 28 so that the doctor blade 13 follows the internal configuration of the periphery of the cylinder 28. It is provided at the periphery of this cam 27 a projecting part 27a, corresponding to the non-raised part 28a of the cylinder 28 adapted to a notch 30 of the printing cylinder 6 and pushing the printing slot always simultaneously with one of these notches 30, to remove the doctor blade 13 during the passage.
  • the rest of the periphery of this cam comprises parts in sail ⁇ lie 27b which correspond to the parts 28b situated between the raised parts 29 of the cylinder 28.
  • Figure 10 shows the third embodiment, a screen cylinder 48, provided with a screen 49 which can be elastically deformed.
  • a doctor blade 51 secured to a bracket 52, one end of which is provided with a guide roller 53 collaborating with a cam 50 driven in synchronous rotation with the cylinder 48.
  • the bracket 52 is subjected to the action of a spring pushing the cam 51 radially against the screen 49.
  • the top of the bracket 52 is articulated at a fixed point 54.
  • the purpose of the cam 50 is to guide the doctor blade 51 as for the first screen holder cy ⁇ 7, so that it moves away from the printing slot when a notch 30 of the printing cylinder 6 is in the printing slot.
  • the screen cylinder 48 does not have a raised part, but the raised parts are created in the printing slot by the collaboration of the front edge of the doctor blade 51 which has teeth 51a and the possibility of elastically deforming the screen 49.
  • the zones which are in contact with the impression cylinder 6 are the zones of the screen 49 being under the pressure of the teeth 51a of the doctor blade 51.
  • the recessed parts 51b of the doctor blade correspond to the zones im ⁇ primed by the cylinder 7 or the areas that are not desired to be printed, the screen 49 in these areas not coming into contact with the printing cylinder 6. It is obviously essential that the screen 49 does not come into contact with the areas already printed because the ink has not had time to dry and the dimensions of these areas 51b of the doctor blade are provided accordingly.
  • FIG. 12 we have shown a variant of the third embodiment shown in FIG. 10.
  • the screen cylinder 48 ' is provided between two consecutive printing zones with two distance rings 55.
  • the role of these rings is to ensure that the screen under the thrust of the doctor blade 51 'will not come into contact with the printing cylinder.
  • the rings 55 have a diameter less than the diameter making it possible to bring the screen 49 'into contact with the printing cylinder.
  • the rings 55 are preferably killed at the ends of the zones which should not come into contact with the printing cylinder.
  • the rings 55 are arranged, preferably but not exclusively, on the outer surface of the screen.
  • the invention is not limited to the embodiments which have just been described and other variants could be envisaged, in particular as regards identifies the configuration of the raised portions of the second screen cylinder, as well as the means for radially moving the doctor blades inside these cylinders.
  • the invention also relates to web printing machines.
  • the machine which is the subject of the present invention can be adapted to any other similar installation or inside a printing chain comprising other usual printing machines for value papers such as that offest, intaglio, Orloff, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Printing Methods (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

PCT No. PCT/CH97/00115 Sec. 371 Date Sep. 14, 1998 Sec. 102(e) Date Sep. 14, 1998 PCT Filed Mar. 19, 1997 PCT Pub. No. WO97/34767 PCT Pub. Date Sep. 25, 1997A machine including a printing cylinder (6) engaging two stencil cylinders (7, 18) for printing at least two non-overlapping areas in different colors using the one printing cylinder. One of the stencil cylinders (7) is conventional and enables silk-screen printing in a first area. The other cylinder (18) includes raised portions provided with a stencil for printing one or more further areas different from the first area while preventing the rest of the stencil cylinder (18) from contacting the printing cylinder and particularly the area(s) printed by the first cylinder (7).

Description

Machine d'impression en sérigraphie.Screen printing machine.
La présente invention concerne une machine d'impression en sérigraphie, notamment de papiers-valeur, comprenant pour l'impression d'une première zone en une couleur déterminée, un cylindre d'impression et un cylindre porte-tamis.The present invention relates to a screen printing machine, in particular of security papers, comprising for printing a first zone in a determined color, a printing cylinder and a screen cylinder.
Il est connu l'utilisation de machines d'impression en sérigraphie comprenant un cylindre d'impression et un cylindre porte-tamis pour l'impression d'une zone d'une couleur déterminée. Lorsqu'on désire imprimer des zones juxtaposées ou superposées d'une autre couleur on pro¬ cède au séchage de la première impression et ensuite le papier passe dans une deuxième machine comprenant un cylindre d'impression et un cylindre porte-tamis pour l'impression en superposition ou juxtaposition de la deuxième image en une couleur différente de la pre¬ mière. Donc, s'il s'agit d'une impression polychrome un passage pour chaque couleur est prévu après séchage de l'encre de l'impression précédente.It is known to use screen printing machines comprising a printing cylinder and a screen cylinder for printing an area of a specific color. When it is desired to print juxtaposed or superimposed zones of another color, the first printing is dried and then the paper passes through a second machine comprising a printing cylinder and a screen cylinder for printing. superimposing or juxtaposing the second image in a color different from the first. So, if it is a full color printing, a passage for each color is provided after the ink from the previous printing has dried.
Dans le soucis de recherche des moyens permettant de rendre difficile la copie ou contrefaçon de papiers- valeur, on utilise différents types d'impression sur un même papier-valeur et entre autre on utilise la séri¬ graphie. Néanmoins, l'impression des différents dessins par des procédés différents et le séchage intermédiaire qui doit avoir lieu, rallongent le temps d'impression des documents et des problèmes de registre entre les différentes impressions rendent ces opérations d'impression délicates et augmentent les coûts par l'addition d'équipement. La présente invention a pour but de proposer une machi¬ ne d'impression en sérigraphie de certaines zones d'un papier par au moins deux dessins non superposés et de couleurs différentes sans devoir passer par un séchage intermédiaire et avec une machine relativement simple et moins volumineuse qu'une installation d'impression en sérigraphie en plusieurs couleurs utilisée jus- qu' ici.For the sake of finding ways to make it difficult to copy or counterfeit security papers, we use different types of printing on the same security paper and, among other things, we use serialization. However, the printing of different designs by different processes and the intermediate drying which must take place, lengthen the printing time of documents and problems of register between the different prints make these printing operations delicate and increase costs by the addition of equipment. The object of the present invention is to propose a screen printing machine for certain areas of a paper by at least two non-superimposed drawings and of different colors without having to go through an intermediate drying and with a relatively simple machine and less bulky than a multi-color screen printing installation used until now.
La machine d'impression en sérigraphie selon l'inven¬ tion^ est caractérisée par le fait qu'elle comprend au moins un deuxième cylindre porte-tamis, que ledit deuxième cylindre porte-tamis coopère avec le même cy¬ lindre d'impression et il est muni de moyens pour l'im¬ pression d'au moins une deuxième zone en une couleur différente de celle de la première zone et en dehors de cette première zone, la machine étant agencée pour que le deuxième cylindre porte-tamis n'entre pas en contact avec le cylindre d'impression sur la ou les zones im¬ primées par le premier cylindre porte-tamis.The screen printing machine according to the inven¬ tion ^ is characterized in that it comprises at least one second screen cylinder, that said second screen cylinder cooperating with the same cy¬ lindre printing and it is provided with means for printing at least one second zone in a color different from that of the first zone and outside this first zone, the machine being arranged so that the second screen cylinder does not does not come into contact with the printing cylinder on the area (s) im¬ primed by the first screen cylinder.
Les avantages de la machine selon l'invention sont les suivants :The advantages of the machine according to the invention are as follows:
impression à un seul passage du papier sur un seul cylindre d'impression d'au moins deux zones non super¬ posées en au moins deux couleurs différentes ce qui rend, d'une part, inutile le séchage intermédiaire entre les deux impressions et, d'autre part, on a une machine moins volumineuse puisqu'on utilise un seul cy¬ lindre d'impression, donc moins coûteuse;printing with a single passage of the paper on a single printing cylinder of at least two non-super¬ posed areas in at least two different colors which makes, on the one hand, unnecessary the intermediate drying between the two prints and, d 'on the other hand, we have a less bulky machine since we use a single printing cylinder, therefore less expensive;
accessoirement il est plus aisé d'obtenir un bon re¬ gistre entre les images imprimées en sérigraphie suc¬ cessivement au moyen du même cylindre d'impression. Ces résultats sont bien entendu obtenus grâce au fait que la deuxième zone est imprimée par un cylindre porte-tamis muni de moyens pour l'impression d'au moins une deuxième zone du papier non encore imprimée et ne touchant pas la zone déjà imprimée par le premier cy¬ lindre porte-tamis. Ce dernier peut être un cylindre porte-tamis conventionnel ou, par exemple, comme celui proposé dans la demande de bevet suisse N° 192/95-0 du demandeur. En évitant de toucher avec le deuxième cy¬ lindre porte-tamis les zones déjà imprimées lors du premier passage, il n'est pas nécessaire de procéder à un séchage intermédiaire. Il est évident que lors de telles impressions, il faut respecter un espacement suffisant entre les deux zones pour éviter que le tamis du deuxième cylindre porte-tamis entre en contact avec la zone préalablement imprimée.incidentally it is easier to obtain a good register between the images printed in serigraphy successively by means of the same printing cylinder. These results are of course obtained thanks to the fact that the second zone is printed by a screen cylinder provided with means for printing at least a second zone of the paper not yet printed and not touching the zone already printed by the first sieve holder cylinder. The latter may be a conventional screen cylinder or, for example, like that proposed in the Swiss patent application No. 192 / 95-0 of the applicant. By avoiding touching with the second sieve holder cy¬ the areas already printed during the first pass, it is not necessary to carry out an intermediate drying. It is obvious that during such printing, there must be sufficient spacing between the two zones to prevent the screen of the second screen cylinder from coming into contact with the previously printed area.
Selon une variante d'exécution, les moyens dont est muni le deuxième cylindre porte-tamis comprennent au moins une partie en relief sur laquelle est disposé un tamis. Ainsi c'est seulement la ou les parties en re¬ lief qui entrent en contact avec le cylindre d'impres¬ sion sur des zones non imprimées par le premier cylin¬ dre porte-tamis. Des dispositifs poussant l'encre à travers le tamis sont prévus à l'intérieur du cylindre porte-tamis, de préférence mais non exclusivement, ces dispositifs sont des racles.According to an alternative embodiment, the means with which the second screen cylinder is provided comprise at least one raised part on which a screen is disposed. Thus it is only the part or parts in re¬ lief which come into contact with the impression cylinder on areas not printed by the first screen holder cylinder. Devices pushing the ink through the screen are provided inside the screen cylinder, preferably but not exclusively, these devices are doctor blades.
Selon une variante préférée de l'invention le tamis du premier cylindre est prévu pour imprimer plusieurs zo¬ nes espacées en une couleur déterminée, le dessin pour¬ rait être le même ou différent pour chaque zone, le deuxième cylindre présente également plusieurs zones en relief permettant d'imprimer un même ou plusieurs des- sins en une deuxième couleur dans des espaces laissés par l'impression précédente.According to a preferred variant of the invention, the screen of the first cylinder is designed to print several spaced zones in a given color, the design could be the same or different for each zone, the second cylinder also has several zones in relief. allowing to print the same or several sins in a second color in spaces left by the previous impression.
Selon une autre variante d'exécution, la machine peut comprendre plusieurs cylindres porte-tamis avec des moyens en relief pour imprimer de manière successive et au moyen d'un seul cylindre d'impression des zones non superposées de couleurs différentes, les reliefs des différents cylindres étant disposés de sorte qu'ils n'entrent pas en contact lors de l'impression avec les zones préalablement imprimées.According to another alternative embodiment, the machine can comprise several screen-carrying cylinders with relief means for successively printing and by means of a single printing cylinder non-superimposed areas of different colors, the reliefs of the different cylinders being arranged so that they do not come into contact during printing with the previously printed areas.
Selon une forme d'exécution, les zones en relief du cy¬ lindre ou de chacun des cylindres porte-tamis ont une forme axiale s'etendant parallèlement à l'axe du cy¬ lindre, le long de la surface de celui-ci sur laquelle est disposé le tamis. Dans ce cas, la racle ou le dis¬ positif équivalent est muni d'un mécanisme permettant son déplacement radial pour pouvoir suivre la configu¬ ration du côté intérieur de la périphérie du cylindre, afin de pousser le tamis disposé sur la partie en re¬ lief du cylindre et se rétracter lorsque par la rota¬ tion du cylindre la partie en retrait vient contre la racle et ainsi de suite.According to one embodiment, the raised areas of the cy¬ lindre or of each of the screen-holder cylinders have an axial shape extending parallel to the axis of the cy¬ lindre, along the surface thereof. which is arranged the sieve. In this case, the doctor blade or the equivalent device is provided with a mechanism allowing its radial displacement in order to be able to follow the configuration on the inside of the periphery of the cylinder, in order to push the screen disposed on the part in re¬ lief of the cylinder and retract when by the rota¬ tion of the cylinder the recessed part comes against the doctor blade and so on.
Selon une forme d'exécution, le mécanisme permettant à la racle d'effectuer ces déplacements dans le sens ra¬ dial est une came tournant en synchronisation avec le cylindre porte-tamis et agissant sur l'extrémité d'un levier dont l'autre extrémité est solidaire de la racle.According to one embodiment, the mechanism allowing the doctor blade to carry out these movements in the ra¬ dial direction is a cam rotating in synchronization with the screen holder cylinder and acting on the end of a lever, the other of which end is integral with the doctor blade.
Selon une autre forme d'exécution, les parties en re¬ lief sont des zones annulaires sur lesquelles on appli¬ que le tamis et dans ce cas la racle a la forme d'un peigne dont les dents se trouvent en permanence à l'in¬ térieur des zones annulaires pour pousser l'encre à travers le tamis dont sont équipées ces zones annulai¬ res.According to another embodiment, the parts in re¬ lief are annular zones on which one applies that the sieve and in this case the doctor blade has the shape of a comb whose teeth are permanently inside the annular zones to push the ink through the screen with which these annular zones are fitted.
Selon une autre variante d'exécution, le deuxième cy¬ lindre porte-tamis est muni d'un tamis déformable élas¬ tiquement de sorte que le contact avec le cylindre d'impression au droit de la fente d'impression ait lieu uniquement sous la poussée des moyens telles qu'une racle ayant dans ce cas la forme d'un peigne dont les dents correspondent aux zones à imprimer en poussant le tamis à entrer en contact avec le cylindre d'impres¬ sion, l'espace entre les dents correspondant à des zo¬ nes imprimées ou non et avec lesquelles le tamis n'en¬ tre pas en contact.According to another alternative embodiment, the second screen holder cy¬ is provided with an elastically deformable screen so that contact with the printing cylinder in line with the printing slot takes place only under the thrust means such as a doctor blade in this case having the shape of a comb whose teeth correspond to the areas to be printed by pushing the screen to come into contact with the impression cylinder, the space between the corresponding teeth to printed or unprinted areas with which the screen does not come into contact.
Selon une variante d'exécution préférée, le tamis est muni d'anneaux de distance aux espaces correspondants entre deux zones consécutives à imprimer empêchant le tamis de se déformer et entrer en contact avec le cy¬ lindre d'impression.According to a preferred embodiment, the screen is provided with distance rings to the corresponding spaces between two consecutive areas to be printed preventing the screen from deforming and coming into contact with the printing cy¬ lindre.
Selon une autre variante d'exécution, la machine est une machine d'impression à la feuille comprenant un cy¬ lindre d'impression avec au moins une encoche logeant le dispositif de saisie de la feuille, et les moyens pour pousser l'encre de chaque cylindre porte-tamis comprennent un mécanisme permettant de les éloigner du tamis lorsqu'une encoche passe dans la fente d'impres¬ sion.According to another alternative embodiment, the machine is a sheet printing machine comprising a printing cylinder with at least one notch housing the device for gripping the sheet, and the means for pushing the ink of each screen holder cylinder includes a mechanism for moving them away from the screen when a notch passes through the printing slot.
L'invention sera décrite plus en détail au moyen de trois exemples d'une machine d'impression à la feuille et à l'aide du dessin annexé. La figure 1 est une représentation schématique latérale d'une installation comprenant une machine faisant l'ob¬ jet de la présente invention.The invention will be described in more detail by means of three examples of a sheet printing machine and with the aid of the accompanying drawing. Figure 1 is a schematic side representation of an installation comprising a machine forming the object of the present invention.
La figure 2 est une vue schématique de côté d'une pre¬ mière forme d'exécution d'un cylindre porte-tamis pré¬ sentant des parties en relief ayant la forme d'anneaux concentriques au cylindre.Figure 2 is a schematic side view of a first embodiment of a screen cylinder pre¬ sensing parts in relief having the form of rings concentric with the cylinder.
La Jîigure 3 est une vue latérale de la racle utilisée dans le cylindre porte-tamis de la première forme d'exécution selon la figure 2.Figure 3 is a side view of the doctor blade used in the screen cylinder of the first embodiment according to Figure 2.
La figure 4 est une vue schématique de côté d'une deuxième forme d'exécution du cylindre porte-tamis pré¬ sentant des parties en relief ayant la forme de zones axiales.Figure 4 is a schematic side view of a second embodiment of the screen cylinder pre¬ feeling parts in relief having the form of axial zones.
La figure 5 est une vue latérale de la racle utilisée dans le cylindre porte-tamis de la deuxième forme d'exécution selon la figure 4.FIG. 5 is a side view of the doctor blade used in the screen cylinder of the second embodiment according to FIG. 4.
La figure 6 montre l'ensemble du cylindre d'impression et des deux cylindres porte-tamis selon une première forme d'exécution.Figure 6 shows the assembly of the printing cylinder and the two screen cylinders according to a first embodiment.
La figure 7 est une représentation similaire à celle de la figure 6 selon une deuxième forme d'exécution.Figure 7 is a representation similar to that of Figure 6 according to a second embodiment.
La figure 8 est une vue schématique d'ensemble permet¬ tant d'expliquer le fonctionnement de la première forme d'exécution selon les figures 2, 3 et 6. La figure 9 est une représentation similaire à celle de la figure 8 pour expliquer le fonctionnement de la deuxième forme d'exécution selon les figures 4, 5 et 7.FIG. 8 is an overall schematic view allowing both to explain the operation of the first embodiment according to FIGS. 2, 3 and 6. FIG. 9 is a representation similar to that of FIG. 8 to explain the operation of the second embodiment according to FIGS. 4, 5 and 7.
La figure 10 est une vue schématique de côté d'une troisième forme d'exécution du cylindre porte-tamis.Figure 10 is a schematic side view of a third embodiment of the screen cylinder.
La figure 11 est une vue latérale de la racle utilisée avec le cylindre porte-tamis de la figure 10.FIG. 11 is a side view of the doctor blade used with the screen cylinder of FIG. 10.
La figure 12 est une vue en coupe axiale d'un cylindre porte-tamis d'une quatrième exécution du cylindre porte-tamis.Figure 12 is an axial sectional view of a screen cylinder of a fourth embodiment of the screen cylinder.
La figure 1 montre une installation complète comprenant une machine pour l'impression en sérigraphie en deux couleurs différentes, selon l'invention. L'installation présente un magasin 1 comprenant les feuilles à impri¬ mer, un dispositif margeur 2 pour le transfert des feuilles le long du trajet 3 vers un cylindre de marge 4, un cylindre de transfert 5 pour amener les feuilles de papier sur un cylindre unique d'impression 6, deux cylindres porte-tamis 7 et 8 coopérant avec le cylindre d'impression 6 et un système de pinces à chaîne 9 qui transporte les feuilles vers les magasins 10 de sortie des feuilles comprenant, dans le cas présent, trois piles.FIG. 1 shows a complete installation comprising a machine for screen printing in two different colors, according to the invention. The installation has a magazine 1 comprising the sheets to be printed, a feeder device 2 for transferring the sheets along the path 3 to a margin cylinder 4, a transfer cylinder 5 for bringing the sheets of paper onto a cylinder single printing 6, two screen cylinders 7 and 8 cooperating with the printing cylinder 6 and a chain clamp system 9 which transports the sheets to the magazines 10 for output of the sheets comprising, in this case, three Battery.
Sur le cylindre d'impression 6 qui tourne dans le sens de la flèche, les feuilles passent d'abord le premier cylindre porte-tamis 7 où elles sont imprimées partiel¬ lement en une première couleur, puis elles passent le deuxième cylindre porte-tamis 8 où elles sont imprimées en une couleur différente dans au moins une zone non superposée, donc en dehors des zones imprimées par le premier cylindre porte-tamis 7, sans qu'au préalable un séchage des zones imprimées par le cylindre 7 soit né¬ cessaire.On the printing cylinder 6 which rotates in the direction of the arrow, the sheets first pass the first screen cylinder 7 where they are partially printed in a first color, then they pass the second screen cylinder 8 where they are printed in a different color in at least one non-superimposed area, therefore outside the areas printed by the first screen cylinder 7, without first drying the areas printed by the cylinder 7 is necessary.
En ce qui concerne le fonctionnement des cylindres porte-tamis, l'impression se fait par des moyens con¬ ventionnels, c'est-à-dire que l'encre est introduite à l'intérieur de chacun des cylindres porte-tamis et lors de la rotation du cylindre elle coule à l'intérieur et est poussée par une racle correspondante, ou autre dis¬ positif équivalent, pour passer à travers le tamis re¬ présentant le dessin à imprimer.Regarding the operation of the screen cylinders, printing is done by conventional means, that is to say that the ink is introduced inside each of the screen cylinders and during from the rotation of the cylinder it flows inside and is pushed by a corresponding doctor blade, or other equivalent device, to pass through the sieve showing the drawing to be printed.
Le décalage susmentionné des zones de couleur différen¬ te est obtenu par le fait que le cylindre porte-tamis 8 présente au moins une partie en relief sur laquelle est disposé un tamis permettant l'impression de la deuxième zone, l'ensemble étant positionné et dimensionné pour que la ou les parties en relief du cylindre porte-tamis 8 n'entrent pas en contact avec les zones imprimées par le cylindre 7, lequel est d'une construction comme déjà proposée par le demandeur.The above-mentioned offset of the different color zones is obtained by the fact that the screen cylinder 8 has at least one raised part on which a screen is arranged allowing the printing of the second zone, the assembly being positioned and dimensioned so that the part or parts in relief of the screen cylinder 8 do not come into contact with the areas printed by the cylinder 7, which is of a construction as already proposed by the applicant.
Le deuxième cylindre porte-tamis 8 selon la présente invention peut être réalisé selon quatre constructions différentes, comme représenté aux figures suivantes; ce deuxième cylindre porte-tamis porte, selon la première forme d'exécution, la référence 18, selon la deuxième forme d'exécution, la référence 28, selon la troisième forme d'exécution, la référence 48 et selon la qua¬ trième forme d'exécution, la référence 48' .The second screen cylinder 8 according to the present invention can be produced according to four different constructions, as shown in the following figures; this second screen cylinder carries, according to the first embodiment, the reference 18, according to the second embodiment, the reference 28, according to the third embodiment, the reference 48 and according to the fourth form of execution, reference 48 '.
La figure 2 montre, selon la première forme d'exécu¬ tion, un cylindre porte-tamis 18 muni de parties en re¬ lief 19 qui ont la forme d'anneaux concentriques au cylindre 18, disposés écartés axialement les uns des autres, comme mieux montré à la figure 8. A l'intérieur de ce cylindre porte-tamis 18 est installée une racle 12, telle qu'illustrée figure 3, dont l'arête frontale est adaptée à la forme de la périphérie intérieure du cylindre porte-tamis 18, et a donc la forme d'un pei¬ gne, dont les dents 12a correspondent, aussi bien en dimension qu'en disposition, aux parties annulaires 19 en relief pour pousser l'encre pendant l'impression à travers le tamis recouvrant les parties en relief 19.Figure 2 shows, according to the first form of execution, a screen cylinder 18 provided with parts in re¬ lief 19 which have the form of concentric rings at cylinder 18, arranged axially spaced from each other, as best shown in Figure 8. Inside this screen cylinder 18 is installed a doctor blade 12, as illustrated in Figure 3, whose front edge is adapted to the shape of the inner periphery of the screen cylinder 18, and therefore has the shape of a pei¬ gne, whose teeth 12a correspond, both in size and in layout, to the annular parts 19 in relief to push the ink during printing through the screen covering the raised parts 19.
Le cylindre porte-tamis 28 selon la deuxième forme d'exécution, tel que représenté figures 4 et 9, est mu¬ ni de parties en relief en forme de zones axiales 29, écartées les unes des autres et s'etendant sur toute la longueur du cylindre et sur lesquelles est disposé un tamis. La racle 13 montée à l'intérieur de ce cylindre 28 est une racle conventionnelle telle que représentée figure 5, dont l'arête frontale est rectiligne. A cause des zones en relief axiales du cylindre 28, cette racle 13 est munie d'un dispositif lui permettant de se ré¬ tracter au fur et à mesure de la rotation du cylindre 28 pour passer les parties en retrait entre les zones en relief 29.The screen cylinder 28 according to the second embodiment, as shown in Figures 4 and 9, is mu¬ ni parts in relief in the form of axial zones 29, spaced from each other and extending over the entire length of the cylinder and on which is placed a screen. The doctor blade 13 mounted inside this cylinder 28 is a conventional doctor blade as shown in FIG. 5, the front edge of which is straight. Because of the axial raised areas of the cylinder 28, this doctor blade 13 is provided with a device allowing it to retract as the cylinder 28 rotates to pass the recessed parts between the raised areas 29 .
Pour mieux comprendre la première forme d'exécution, on se réfère aux figures 6 et 8 sur lesquelles on a repré¬ senté schématiquement les deux cylindres porte-tamis 7 et 18 ainsi qu'une feuille de papier imprimée 40 mon¬ trée sur la figure 8 en développement. Dans le cas pré¬ sent, le diamètre du cylindre porte-tamis 7 et 18 est égal à un tiers du diamètre du cylindre d'impression 6, dont la surface correspond à trois feuilles. Une feuil¬ le 40 est montrée à la figure 8 et elle comporte 5 x 9 ≈ 45 impressions de billets de banque disposées en ran- gées transversales et longitudinales qui doivent être complétées par deux zones de couleur différente, à sa¬ voir, dans le cas considéré, une première zone cons¬ tituée par le caractère "a" et une deuxième zone cons¬ tituée par le caractère "B" .To better understand the first embodiment, reference is made to FIGS. 6 and 8, in which the two screen cylinder 7 and 18 are shown schematically, as well as a sheet of printed paper 40 shown in FIG. 8 in development. In the present case, the diameter of the screen cylinder 7 and 18 is equal to one third of the diameter of the printing cylinder 6, the surface of which corresponds to three sheets. A sheet 40 is shown in Figure 8 and has 5 x 9 ≈ 45 bank note prints arranged in a row. transverse and longitudinal gages which must be completed by two zones of different color, to be seen, in the case under consideration, a first zone constituted by the character "a" and a second zone constituted by the character "B" .
A cet effet, la machine selon la figure 6 comprend le cylindre d'impression 6 muni de trois rangées de pinces 31 logées dans des encoches 30, lesdites pinces 31 étant destinées à tenir l'extrémité antérieure d'une feui_lle 40 qui vient du cylindre de transfert 5 (figure 1) pour la faire passer devant les deux cylindres porte-tamis 7 et 18. Le cylindre porte-tamis 7 est du type proposé dans la demande de brevet CH 192/95-0, et permet l'impression d'une manière conventionnelle du caractère "a" dans une couleur déterminée sur chaque impression de billet de banque. Ce cylindre 7 est muni sur son axe d'une came 17 tournant avec lui et agissant sur un levier en forme d'équerre 15 dont l'une des ex¬ trémités est munie d'un galet 16 correspondant avec la came 17, cette équerre étant sous l'action d'un ressort non représenté qui le pousse radialement à l'extérieur vers le tamis. Le sommet de l'angle de l'équerre 15 est articulé à un point fixe 14 tandis que l'autre extré¬ mité du levier est solidaire de la racle 11. Le but de cette came 17 (comme décrit dans ladite demande de bre¬ vet CH 192/95-0) est d'éloigner la racle 11 du côté in¬ térieur du tamis, contre l'action dudit ressort, lors¬ que la partie en saillie 17a de la came 17 vient en contact avec le galet 16 de l'équerre 15. Ceci a lieu pendant qu'une des encoches 30 du cylindre d'impression 6 passe la fente d' impression entre les cylindres 6 et 7, donc vient face à la position de la racle 11. Le non éloignement de la racle 11 aurait pour effet d'endomma¬ ger le tamis puisqu'à cet endroit le cylindre d'impres- sion 6 ne présente pas une surface contre laquelle le tamis du cylindre 7 s'appuierait sous la pression de la racle 11.To this end, the machine according to FIG. 6 comprises the printing cylinder 6 provided with three rows of pliers 31 housed in notches 30, said pliers 31 being intended to hold the front end of a sheet 40 which comes from the cylinder transfer 5 (Figure 1) to pass in front of the two screen cylinders 7 and 18. The screen cylinder 7 is of the type proposed in patent application CH 192 / 95-0, and allows the printing of 'a conventional manner of the character "a" in a color determined on each printing of bank note. This cylinder 7 is provided on its axis with a cam 17 rotating with it and acting on a lever 15 in the form of a square, one of the ends of which is provided with a roller 16 corresponding to the cam 17, this bracket being under the action of a spring (not shown) which pushes it radially outside towards the sieve. The top of the angle of the bracket 15 is articulated at a fixed point 14 while the other end of the lever is secured to the doctor blade 11. The purpose of this cam 17 (as described in said request for bre¬ vet CH 192 / 95-0) is to move the doctor blade 11 away from the inner side of the screen, against the action of said spring, when the projecting part 17a of the cam 17 comes into contact with the roller 16 of the square 15. This takes place while one of the notches 30 of the printing cylinder 6 passes the printing slot between the cylinders 6 and 7, so comes opposite the position of the doctor blade 11. The non-removal of the doctor blade 11 would have the effect of damaging the screen since at this point the printing cylinder sion 6 does not have a surface against which the screen of the cylinder 7 would bear under the pressure of the doctor blade 11.
Il est évident que l'on pourrait piloter la racle par d'autres moyens notamment un vérin hydraulique ou pneu¬ matique commandé par un dispositif électronique, élec¬ tromécanique, etc.It is obvious that one could control the doctor blade by other means in particular a hydraulic or pneumatic cylinder controlled by an electronic, electromechanical device, etc.
Par la suite, le papier 40 passe devant le deuxième cy¬ lindre porte-tamis 18 pour l'impression de la deuxième zone constituée par le caractère "B" . Ce cylindre 18 est muni de parties annulaires en relief 19 sur chacune desquelles est tendu un tamis avec le dessin à impri¬ mer, en l'occurrence la lettre "B". On constate que les parties en relief 19 du cylindre 18 sont décalées laté¬ ralement par rapport aux zones d'impression du cylindre 7 comprenant la lettre "a". Ainsi, lors du passage de la feuille 40 entre les cylindres 6 et 18, les zones déjà imprimées par le cylindre 7, ne viennent pas en contact avec le cylindre 18 puisque ces zones compor¬ tant les "a" se trouvent face aux espaces en retrait entre deux zones annulaires 19. Ainsi, l'impression peut se faire en un seul passage au moyen du même cy¬ lindre d'impression et sans attendre que les zones im¬ primées par le cylindre 7 soient préalablement séchées.Subsequently, the paper 40 passes in front of the second screen holder cylinder 18 for printing the second area constituted by the character "B". This cylinder 18 is provided with annular raised portions 19 on each of which is stretched a sieve with the print design, in this case the letter "B". It can be seen that the raised parts 19 of the cylinder 18 are offset laterally with respect to the printing areas of the cylinder 7 comprising the letter "a". Thus, during the passage of the sheet 40 between the cylinders 6 and 18, the zones already printed by the cylinder 7 do not come into contact with the cylinder 18 since these zones comprising the "a" are facing the spaces in withdrawal between two annular zones 19. Thus, the printing can be done in a single pass by means of the same printing cylinder and without waiting for the zones printed by the cylinder 7 to be dried beforehand.
Cette disposition des zones annulaires permet l'impres¬ sion des zones décalées perpendiculairement au sens de déplacement du papier 40.This arrangement of the annular zones allows the printing of the zones offset perpendicular to the direction of movement of the paper 40.
A l'intérieur du cylindre porte-tamis 18 se trouve la racle 12, telle qu'illustrée figure 3, en forme de pei¬ gne avec des dents 12a; cette racle 12 est montée, comme dans le cas du premier cylindre porte-tamis 7, à une extrémité d'une équerre 21 articulée à son sommet autour d'un axe fixe 20 et portant à son autre extré¬ mité un galet 22 qui est en contact permanent avec la surface d'une came 23 munie d'une partie en saillie 23a. Cette came 23 a donc la même configuration que la came 17 du cylindre 7 et agit dans le même but, à sa¬ voir retirer la racle 12 du côté intérieur du tamis lors du passage en face de la fente d'impression d'une des encoches 30 du cylindre d'impression 6.Inside the screen cylinder 18 is the doctor blade 12, as illustrated in FIG. 3, in the shape of a pei¬ with teeth 12a; this doctor blade 12 is mounted, as in the case of the first screen cylinder 7, to one end of a bracket 21 articulated at its apex around a fixed axis 20 and carrying at its other end a roller 22 which is in permanent contact with the surface of a cam 23 provided with a projecting part 23a . This cam 23 therefore has the same configuration as the cam 17 of the cylinder 7 and acts for the same purpose, except that the squeegee 12 is removed from the inner side of the screen when passing in front of the printing slot of one of the notches 30 of the printing cylinder 6.
La deuxième forme d'exécution selon les figures 7 et 9 permet l'impression des zones, en forme de caractères "a" et "B", décalées dans le sens de déplacement des feuilles de papier 41 qui comportent de nouveau 5 x 9 impressions de billets. Le cylindre porte-tamis 7, avec sa racle, son équerre et la came 17, 17a, est identique à celui de la figure 6 et imprime les premières zones avec la lettre "a"; le cylindre d'impression 6 a égale¬ ment la même construction que celui décrit en relation avec la figure 6.The second embodiment according to FIGS. 7 and 9 allows the printing of the zones, in the form of characters "a" and "B", offset in the direction of movement of the sheets of paper 41 which again include 5 x 9 prints. of tickets. The screen cylinder 7, with its doctor blade, its square and the cam 17, 17a, is identical to that of FIG. 6 and prints the first zones with the letter "a"; the printing cylinder 6 also has the same construction as that described in relation to FIG. 6.
Le deuxième cylindre porte-tamis 28 comportant des zones en relief axiales 29 s'etendant sur toute sa lon¬ gueur est muni d'un tamis sur chacune des parties en relief 29 pour l'impression de la lettre "B" dans une autre couleur que la lettre "a". Cette impression est, comme on peut le voir sur la feuille 41 (figure 9) im¬ primée décalée dans le sens du déplacement du papier. La racle 13 est contrôlée par une came 27 fixée à l'axe du cylindre 28 et tournant en synchronisme avec celui-ci. Cette racle 13 est fixée à une extrémité d'une équerre 25 articulée en son sommet sur un axe fixe 24 et munie à son autre extrémité d'un galet 26 en contact permanent avec une came 27. La forme de cette came 27 reproduit, à une plus petite échelle, le con- tour du cylindre porte-tamis 28, en négatif, pour per¬ mettre le guidage de la racle 13 à l'intérieur dudit cylindre 28 de manière que la racle 13 suive la confi¬ guration intérieure de la périphérie du cylindre 28. Il est prévu à la périphérie de cette came 27 une partie saillante 27a, correspondant à la partie non en relief 28a du cylindre 28 adaptée à une encoche 30 du cylindre d'impression 6 et poussant la fente d'impression tou¬ jours simultanément avec l'une de ces encoches 30, pour enlever la racle 13 lors du passage. Le reste de la périphérie de cette came comporte des parties en sail¬ lie 27b qui correspondent aux parties 28b situées entre les parties en relief 29 du cylindre 28.The second screen cylinder 28 comprising axial raised areas 29 extending over its entire length is provided with a screen on each of the raised parts 29 for printing the letter "B" in another color than the letter "a". This impression is, as can be seen on sheet 41 (FIG. 9) printed, offset in the direction of movement of the paper. The doctor blade 13 is controlled by a cam 27 fixed to the axis of the cylinder 28 and rotating in synchronism with the latter. This doctor blade 13 is fixed to one end of a bracket 25 articulated at its top on a fixed axis 24 and provided at its other end with a roller 26 in permanent contact with a cam 27. The shape of this cam 27 reproduced, at a smaller scale, the con- turn of the screen cylinder 28, in negative, for per¬ put the guide of the doctor blade 13 inside said cylinder 28 so that the doctor blade 13 follows the internal configuration of the periphery of the cylinder 28. It is provided at the periphery of this cam 27 a projecting part 27a, corresponding to the non-raised part 28a of the cylinder 28 adapted to a notch 30 of the printing cylinder 6 and pushing the printing slot always simultaneously with one of these notches 30, to remove the doctor blade 13 during the passage. The rest of the periphery of this cam comprises parts in sail¬ lie 27b which correspond to the parts 28b situated between the raised parts 29 of the cylinder 28.
La figure 10 montre la troisième forme d'exécution, un cylindre porte-tamis 48, muni d'un tamis 49 pouvant être déformé élastiquement. A l'intérieur de ce cylin¬ dre 48, est disposée une racle 51 solidaire d'une équerre 52 dont une extrémité est munie d'un galet de guidage 53 collaborant avec une came 50 entraînée en rotation synchrone avec le cylindre 48. L'équerre 52 est soumise à l'action d'un ressort poussant la came 51 radialement contre le tamis 49. Le sommet de l'équerre 52 est articulé à un point fixe 54. Le but de la came 50 est de guider la racle 51 comme pour le premier cy¬ lindre porte-tamis 7, afin qu'elle s'éloigne de la fente d'impression lorsqu'une encoche 30 du cylindre d'impression 6 se trouve dans la fente d'impression.Figure 10 shows the third embodiment, a screen cylinder 48, provided with a screen 49 which can be elastically deformed. Inside this cylin¬ dre 48, is disposed a doctor blade 51 secured to a bracket 52, one end of which is provided with a guide roller 53 collaborating with a cam 50 driven in synchronous rotation with the cylinder 48. The bracket 52 is subjected to the action of a spring pushing the cam 51 radially against the screen 49. The top of the bracket 52 is articulated at a fixed point 54. The purpose of the cam 50 is to guide the doctor blade 51 as for the first screen holder cy¬ 7, so that it moves away from the printing slot when a notch 30 of the printing cylinder 6 is in the printing slot.
Pour cette troisième forme d'exécution, le cylindre porte-tamis 48 ne présente pas de partie en relief, mais les parties en relief sont créées dans la fente d'impression par la collaboration de l'arête frontale de la racle 51 qui présente des dents 51a et la possi¬ bilité de se déformer élastiquement du tamis 49. Ainsi, les zones qui sont en contact avec le cylindre d'im¬ pression 6 sont les zones du tamis 49 se trouvant sous la pression des dents 51a de la racle 51. Les parties en retrait 51b de la racle correspondent aux zones im¬ primées par le cylindre 7 ou les zones que l'on ne dé¬ sire pas imprimer, le tamis 49 dans ces zones n'entrant pas en contact avec le cylindre d'impression 6. Il est évidemment indispensable que le tamis 49 n'entre pas en contact avec les zones déjà imprimées car l'encre n'a pas eu le temps de sécher et les dimensions de ces zones_ 51b de la racle sont prévues en conséquence.For this third embodiment, the screen cylinder 48 does not have a raised part, but the raised parts are created in the printing slot by the collaboration of the front edge of the doctor blade 51 which has teeth 51a and the possibility of elastically deforming the screen 49. Thus, the zones which are in contact with the impression cylinder 6 are the zones of the screen 49 being under the pressure of the teeth 51a of the doctor blade 51. The recessed parts 51b of the doctor blade correspond to the zones im¬ primed by the cylinder 7 or the areas that are not desired to be printed, the screen 49 in these areas not coming into contact with the printing cylinder 6. It is obviously essential that the screen 49 does not come into contact with the areas already printed because the ink has not had time to dry and the dimensions of these areas 51b of the doctor blade are provided accordingly.
Enfin, sur la figure 12 nous avons représenté une va¬ riante de la troisième forme d'exécution représentée à la figure 10.Finally, in FIG. 12 we have shown a variant of the third embodiment shown in FIG. 10.
Le cylindre porte-tamis 48' est muni entre deux zones d' impression consécutives de deux anneaux de distance 55. On pourrait se contenter d'un seul anneau par espa¬ ce en fonction de la largeur de la zone que l'on ne désire pas mettre en contact avec le cylindre d'impres¬ sion. Le rôle de ces anneaux est de s'assurer que le tamis sous la poussée de la racle 51' n'entrera pas sur parties en contact avec le cylindre d'impression. Dans ce but, les anneaux 55 ont un diamètre inférieur au diamètre permettant de mettre en contact le tamis 49' avec le cylindre d'impression. Les anneaux 55 sont si¬ tués de préférence aux extrémités des zones ne devant pas entrer en contact avec le cylindre d'impression. Les anneaux 55 sont disposés, de préférence mais non exclusivement, sur la surface extérieure du tamis.The screen cylinder 48 'is provided between two consecutive printing zones with two distance rings 55. We could be satisfied with a single ring per space depending on the width of the zone that is not desired not put in contact with the impression cylinder. The role of these rings is to ensure that the screen under the thrust of the doctor blade 51 'will not come into contact with the printing cylinder. For this purpose, the rings 55 have a diameter less than the diameter making it possible to bring the screen 49 'into contact with the printing cylinder. The rings 55 are preferably killed at the ends of the zones which should not come into contact with the printing cylinder. The rings 55 are arranged, preferably but not exclusively, on the outer surface of the screen.
L'invention n'est pas limitée aux formes d'exécution qui viennent d'être décrites et d'autres variantes pourraient être envisagées, notamment en ce qui con- cerne la configuration des parties en relief du deuxième cylindre porte-tamis, ainsi que les moyens pour déplacer radialement les racles à l'intérieur de ces cylindres. En outre, l'invention concerne aussi des machines d'impression à la bobine.The invention is not limited to the embodiments which have just been described and other variants could be envisaged, in particular as regards identifies the configuration of the raised portions of the second screen cylinder, as well as the means for radially moving the doctor blades inside these cylinders. In addition, the invention also relates to web printing machines.
Il est également possible de prévoir plus de deux cy¬ lindres porte-tamis, avec des parties en contact avec le cylindre d'impression décalées par rapport aussi bien aux zones imprimées par le cylindre 7 qu'à celles imprimées par le cylindre 8 ou 28 ou 48 ou 48' et pour autant que les dimensions et l'emplacement desdits cy¬ lindres le permettent, pour donner la possibilité d'im¬ primer plus de deux zones non superposées en couleurs différentes avec un seul cylindre d'impression.It is also possible to provide more than two sieve holder cy¬, with parts in contact with the printing cylinder offset relative to both the areas printed by the cylinder 7 and those printed by the cylinder 8 or 28 or 48 or 48 'and as far as the dimensions and the location of said cylinders allow, to give the possibility of printing more than two non-superimposed areas in different colors with a single printing cylinder.
En outre, la machine faisant l'objet de la présente in¬ vention peut être adaptée à toute autre installation similaire ou à l'intérieur d'une chaîne d'impression comprenant d'autres machines d'impression habituelles pour les papiers-valeur tels que offest, intaglio, Orloff, etc. In addition, the machine which is the subject of the present invention can be adapted to any other similar installation or inside a printing chain comprising other usual printing machines for value papers such as that offest, intaglio, Orloff, etc.

Claims

REVENDICATIONS. CLAIMS.
1. Machine d'impression en sérigraphie comprenant pour l'impression d'au moins une première zone en une cou¬ leur déterminée, un cylindre d'impression (6) et un cy¬ lindre porte-tamis (7) , caractérisée par le fait qu'elle comprend au moins un deuxième cylindre porte- tamis (8; 18; 28; 48; 48'), que ledit deuxième cylindre porte-tamis coopère avec le même cylindre d'impression1. Screen printing machine comprising for printing at least a first zone in a determined color, a printing cylinder (6) and a screen holder cy¬ linder (7), characterized by fact that it comprises at least a second screen cylinder (8; 18; 28; 48; 48 '), that said second screen cylinder cooperates with the same printing cylinder
(6) et il est muni de moyens (19; 29; 51a; 51'a) pour l'impression d'au moins une deuxième zone en une cou¬ leur différente de celle de la première zone et en de¬ hors de cette première zone, la machine étant agencée pour que le deuxième cylindre porte-tamis (8; 18; 28; 48; 48') n'entre pas en contact avec le cylindre d'im¬ pression (6) sur la ou les zones imprimées par le pre¬ mier cylindre porte-tamis (7) .(6) and it is provided with means (19; 29; 51a; 51'a) for printing at least one second zone in a color different from that of the first zone and outside it. first zone, the machine being arranged so that the second screen cylinder (8; 18; 28; 48; 48 ') does not come into contact with the printing cylinder (6) on the printed zone or zones by the first screen cylinder (7).
2. Machine selon la revendication 1, caractérisée par le fait que lesdits moyens dont est muni le deuxième cylindre porte-tamis comprennent au moins une partie en relief (19; 29) sur laquelle est disposé un tamis.2. Machine according to claim 1, characterized in that said means which is provided with the second screen cylinder comprises at least one raised part (19; 29) on which is disposed a screen.
3. Machine selon la revendication 2, caractérisée par le fait que le premier cylindre porte-tamis (7) est équipé d'un tamis pour l'impression de plusieurs zones éloignées, que le deuxième cylindre porte-tamis (8; 18; 28) présente plusieurs parties en relief (19; 29) pour l'impression des zones non imprimées par le premier cy¬ lindre porte-tamis (7) .3. Machine according to claim 2, characterized in that the first screen cylinder (7) is equipped with a screen for printing several remote areas, that the second screen cylinder (8; 18; 28 ) has several raised parts (19; 29) for printing areas not printed by the first screen holder cy¬ (7).
4. Machine selon la revendication 2 ou 3, caractérisée par le fait que les parties en relief du deuxième cy¬ lindre porte-tamis (18) sont des zones annulaires (19) . 4. Machine according to claim 2 or 3, characterized in that the raised parts of the second screen holder cy¬ lindre (18) are annular zones (19).
5. Machine selon la revendication 2 ou 3, caractérisée par le fait que les parties en relief du deuxième cy¬ lindre porte-tamis (28) sont des zones axiales (29) .5. Machine according to claim 2 or 3, characterized in that the raised parts of the second screen holder cy¬ lindre (28) are axial zones (29).
6. Machine selon la revendication 1 ou 5, caractérisée par le fait que les cylindres porte-tamis (7; 18; 28; 48; 48') sont munis à leur intérieur de moyens (11; 12; 13; 51; 51') pour pousser l'encre contre le côté inté¬ rieur du tamis.6. Machine according to claim 1 or 5, characterized in that the screen holder cylinders (7; 18; 28; 48; 48 ') are provided within their means (11; 12; 13; 51; 51' ) to push the ink against the inner side of the screen.
7. Machine selon les revendications 4 et 6, caractéri¬ sée par le fait que lesdits moyens (12) pour pousser l'encre du deuxième cylindre porte-tamis (18) sont con¬ çus de façon qu'ils engagent seulement les zones annu¬ laires en relief (19) et sont de préférence formés par une racle (12) qui a la forme d'un peigne dont les dents (12a) rentrent dans les zones annulaires dudit cylindre porte-tamis (18) .7. Machine according to claims 4 and 6, characterized by the fact that said means (12) for pushing the ink from the second screen cylinder (18) are designed so that they only engage the annu zones ¬ laires in relief (19) and are preferably formed by a doctor blade (12) which has the shape of a comb, the teeth (12a) of which fit into the annular zones of said screen holder cylinder (18).
8. Machine selon les revendications 5 et 6, caractéri¬ sée par le fait que lesdits moyens (13) pour pousser l'encre du deuxième cylindre porte-tamis (28) sont mu¬ nis d'un mécanisme (25, 27) pour être déplacés radiale¬ ment, de telle manière qu'ils suivent la configuration de la périphérie intérieur du cylindre porte-tamis (28)8. Machine according to claims 5 and 6, characterized by the fact that said means (13) for pushing ink from the second screen cylinder (28) are provided with a mechanism (25, 27) for be moved radially, so that they follow the configuration of the inner periphery of the screen cylinder (28)
9. Machine selon la revendication 8, caractérisée par le fait que ledit mécanisme comprend une came (27) con¬ çue pour être entraînée en rotation en synchronisation avec le cylindre porte-tamis (28) agissant sur un le¬ vier (25) solidaire de la racle (13) .9. Machine according to claim 8, characterized in that said mechanism comprises a cam (27) designed to be driven in rotation in synchronization with the screen holder cylinder (28) acting on a le¬ sink (25) integral of the doctor blade (13).
10. Machine selon la revendication 1, caractérisée par le fait que les moyens du deuxième cylindre porte-tamis (48; 48') pour l'impression d'une deuxième zone corn- prennent un tamis (49; 49') deformable élastiquement et des moyens (51; 51.') poussant radialement vers l'exté¬ rieur le tamis et l'encre uniquement le long des zones à imprimer pour mettre en contact le tamis (49) avec le cylindre d'impression (6), le long desdites zones.10. Machine according to claim 1, characterized in that the means of the second screen cylinder (48; 48 ') for printing a second corneal zone take an elastically deformable screen (49; 49 ') and means (51; 51.') pushing the screen radially outwards and the ink only along the areas to be printed to bring the screen into contact (49 ) with the printing cylinder (6), along said areas.
11. Machine selon la revendication 10, caractérisée par le fait que les moyens poussant radialement vers l'ex¬ térieur le tamis (49') sont une racle (51') en forme de peigne dont les dents (51'a) correspondent aux zones à imprimer et le tamis est muni entre deux zones consécu¬ tives à imprimer d'au moins un anneau (55) empêchant la déformation du tamis et le contact avec le cylindre d' impression.11. Machine according to claim 10, characterized in that the means pushing radially outwards the sieve (49 ') are a doctor blade (51') in the form of a comb whose teeth (51'a) correspond to areas to be printed and the sieve is provided between two consecu¬ tive areas to be printed with at least one ring (55) preventing deformation of the sieve and contact with the printing cylinder.
12. Machine selon la revendication 11, caractérisée par le fait que le tamis (49') comporte deux anneaux (55) délimitant chaque zone ne devant pas entrer en contact avec le cylindre d'impression.12. Machine according to claim 11, characterized in that the screen (49 ') has two rings (55) delimiting each zone not to come into contact with the printing cylinder.
13. Machine selon l'une des revendications 11 ou 12, caractérisée par le fait que lesdits anneaux (55) sont disposés à l'extérieur du tamis (49') .13. Machine according to one of claims 11 or 12, characterized in that said rings (55) are arranged outside the screen (49 ').
14. Machine selon l'une des revendications 1 à 13 , ca¬ ractérisée par le fait qu'elle comprend d'autres cylin¬ dres porte-tamis pour l'impression d'autres zones ne chevauchant pas les zones précédentes préalablement im¬ primées, chacune en une couleur différente, que ces cy¬ lindres porte-tamis présentent des moyens disposés de sorte à imprimer des zones intercalées entre les zones déjà imprimées, la machine étant conçue pour que chacun des cylindres porte-tamis n'entre pas en contact avec le cylindre d'impression sur des zones préalablement imprimées. 14. Machine according to one of claims 1 to 13, ca¬ characterized in that it comprises other cylin¬ dres sieve holder for printing other areas not overlapping the previous areas previously im¬ prizes , each in a different color, that these cy¬ lindres sieve have means arranged so as to print areas interposed between the areas already printed, the machine being designed so that each of the sieve cylinders does not come into contact with the printing cylinder on previously printed areas.
15. Machine selon l'une des revendications 1 à 14 , ca¬ ractérisée par le fait que ladite machine est une ma¬ chine d'impression à la feuille comprennant un cylindre d'impression avec au moins une encoche (30) et que les¬ dits moyens pour pousser l'encre de chaque cylindre porte-tamis (7, 18, 28, 48, 48') , notamment les racles comprennent un mécanisme (17, 15; 23, 21; 27, 25; 50, 52), permettant de les éloigner du tamis lorsqu'une en¬ coche passe dans la fente d'impression. 15. Machine according to one of claims 1 to 14, ca¬ characterized by the fact that said machine is a sheet printing machine comprising a printing cylinder with at least one notch (30) and that the ¬ said means for pushing the ink from each screen cylinder (7, 18, 28, 48, 48 '), in particular the doctor blades include a mechanism (17, 15; 23, 21; 27, 25; 50, 52) , allowing them to be moved away from the sieve when a notch passes through the printing slot.
EP97906079A 1996-03-21 1997-03-19 Silk-screen printing machine Expired - Lifetime EP0889783B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH73296 1996-03-21
CH73296 1996-03-21
CH732/96 1996-03-21
PCT/CH1997/000115 WO1997034767A1 (en) 1996-03-21 1997-03-19 Silk-screen printing machine

Publications (2)

Publication Number Publication Date
EP0889783A1 true EP0889783A1 (en) 1999-01-13
EP0889783B1 EP0889783B1 (en) 2000-07-12

Family

ID=4193909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97906079A Expired - Lifetime EP0889783B1 (en) 1996-03-21 1997-03-19 Silk-screen printing machine

Country Status (11)

Country Link
US (1) US6109172A (en)
EP (1) EP0889783B1 (en)
JP (1) JP4260885B2 (en)
KR (1) KR100453836B1 (en)
CN (1) CN1273293C (en)
AT (1) ATE194548T1 (en)
AU (1) AU709046B2 (en)
DE (1) DE69702504T2 (en)
RU (1) RU2160671C2 (en)
UA (1) UA52653C2 (en)
WO (1) WO1997034767A1 (en)

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Also Published As

Publication number Publication date
CN1273293C (en) 2006-09-06
CN1216500A (en) 1999-05-12
RU2160671C2 (en) 2000-12-20
KR20000064726A (en) 2000-11-06
EP0889783B1 (en) 2000-07-12
DE69702504D1 (en) 2000-08-17
UA52653C2 (en) 2003-01-15
AU709046B2 (en) 1999-08-19
JP4260885B2 (en) 2009-04-30
DE69702504T2 (en) 2001-04-19
ATE194548T1 (en) 2000-07-15
JP2000506461A (en) 2000-05-30
US6109172A (en) 2000-08-29
WO1997034767A1 (en) 1997-09-25
KR100453836B1 (en) 2004-12-30
AU2090297A (en) 1997-10-10

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