EP0889783B1 - Silk-screen printing machine - Google Patents

Silk-screen printing machine Download PDF

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Publication number
EP0889783B1
EP0889783B1 EP97906079A EP97906079A EP0889783B1 EP 0889783 B1 EP0889783 B1 EP 0889783B1 EP 97906079 A EP97906079 A EP 97906079A EP 97906079 A EP97906079 A EP 97906079A EP 0889783 B1 EP0889783 B1 EP 0889783B1
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EP
European Patent Office
Prior art keywords
screen
cylinder
printing
machine
areas
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
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EP97906079A
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German (de)
French (fr)
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EP0889783A1 (en
Inventor
Hans Wyssmann
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KBA Notasys SA
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De la Rue Giori SA
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Publication of EP0889783A1 publication Critical patent/EP0889783A1/en
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    • 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 printing machine in screen printing including for printing at least a first zone in a specific color, a printing cylinder and a screen cylinder and at at least a second screen cylinder cooperating with the same printing cylinder and provided with means for printing at least a second area in one color different from that of the first zone.
  • US-A-3934502 describes a printing machine in screen printing including a printing cylinder and at least two screen cylinders cooperating with the printing cylinder for printing at least two zones, each zone having a different color from the other.
  • US-A-39 903 63 also describes a machine similar to the previous one with the difference that the printed areas do not overlap and that the second cylinder screen holder does not come into contact with the cylinder printing on the area printed by the first screen cylinder.
  • the object of the present invention is to propose a machine screen printing of certain areas of a paper by at least two non-overlapping designs and different colors without having to go through drying intermediate and with a relatively simple machine and less bulky than a printing installation in serigraphy in several colors used until now.
  • the screen printing machine according to the invention is characterized by the fact that the machine is arranged so that said second zone is outside of the first zone, the second screen cylinder comprising at least one raised part on which a sieve is arranged, so the second sieve cylinder does not come into contact with the cylinder on the area or areas printed by the first screen cylinder.
  • the second zone is printed by a cylinder screen holder provided with means for printing at least a second area of the paper not yet printed and does not not touching the area already printed by the first cylinder screen holder.
  • the means with which this is provided second screen cylinder include at least one part in relief on which is placed a sieve. Thus, it is only the part or parts in relief which come into contact with the print cylinder on areas not printed by the first screen cylinder.
  • Devices pushing ink through the screens are provided inside the screen cylinder, preferably but not exclusively, these devices are doctor blades.
  • the first screen cylinder can be a conventional screen cylinder or, for example, like the one proposed in the request applicant's European patent 0 723 864 (cited in accordance with Article 54 (3) EPC).
  • EPC European patent 0 723 864
  • the sieve of first cylinder is intended to print several areas spaced in a specific 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 drawings in a second color in spaces left by the previous impression.
  • the machine can include multiple screen cylinders with embossed means for successively printing and by means of a single impression cylinder of the non- superimposed in different colors, the reliefs of different cylinders being arranged so that they do not come into contact when printing with previously printed areas.
  • the raised areas of the cylinder or each of the screen cylinders have a axial shape extending parallel to the axis of the cylinder, along the surface of it on which the sieve is placed.
  • the doctor blade or the device equivalent is provided with a mechanism allowing its radial displacement to be able to follow the configuration on the inside of the periphery of the cylinder, in order to push the sieve placed on the raised part of the cylinder and retract when by rotation of the cylinder the recessed part comes against the doctor blade and so on.
  • the mechanism allowing the doctor blade to make these movements in the radial direction is a cam rotating in synchronization with the screen cylinder and acting on the end of a lever whose other end is integral with the scrapes.
  • the raised parts are annular areas to which we apply the sieve and in this case the doctor blade has the shape of a comb with teeth permanently inside annular areas to push the ink to through the screen with which these annular zones are fitted.
  • the second cylinder screen holder is fitted with an elastically deformable screen so that contact with the cylinder printing at the right of the printing slot takes place only under the pressure of means such as doctor blade in this case in the form of a comb whose teeth correspond to the areas to be printed by pushing the sieve to come into contact with the printing cylinder, the space between the teeth corresponding to areas printed or not and with which the sieve does not enter not in contact.
  • the sieve is provided with distance rings to the corresponding spaces between two consecutive areas to be printed preventing the strainer to deform and come into contact with the cylinder printing.
  • the machine is a sheet printing machine comprising a cylinder printing with at least one notch housing the sheet gripping device, and the means to push the ink out of each screen cylinder include a mechanism to keep them away from sieve when a notch passes through the printing slot.
  • Figure 1 is a side schematic representation an installation comprising a machine which is the subject of the present invention.
  • Figure 2 is a schematic side view of a first embodiment of a screen cylinder having raised portions in the form of rings concentric to the cylinder.
  • Figure 3 is a side view of the doctor blade used in the screen cylinder of the first form Figure 2.
  • Figure 4 is a schematic side view of a second embodiment of the screen cylinder having raised parts in the form of zones axial.
  • Figure 5 is a side view of the doctor blade used in the screen cylinder of the second form Figure 4.
  • Figure 6 shows the entire print cylinder and two screen cylinders according to a first form of execution.
  • Figure 7 is a representation similar to that of Figure 6 according to a second embodiment.
  • Figure 8 is a schematic overview for to explain how the first form works according to Figures 2, 3 and 6.
  • Figure 9 is a representation similar to that of Figure 8 to explain how the second embodiment according to Figures 4, 5 and 7.
  • Figure 10 is a schematic side view of a third embodiment of the screen cylinder.
  • Figure 11 is a side view of the doctor blade used with the screen cylinder in Figure 10.
  • Figure 12 is an axial sectional view of a cylinder screen holder according to the third version.
  • Figure 1 shows a complete installation including one machine for screen printing in two different colors, according to the invention.
  • the installation presents a magazine 1 comprising the sheets to be printed, a feeder 2 for the transfer of sheets along path 3 to a margin cylinder 4, a transfer cylinder 5 for feeding the sheets of paper on a single printing cylinder 6, two screen cylinders 7 and 8 cooperating with the cylinder 6 and a chain clamp system 9 which transports the sheets to the 10 outlet stores sheets comprising, in this case, three Battery.
  • the leaves pass first 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 area not superimposed, therefore outside the areas printed by the first screen cylinder 7, without first having a drying of the areas printed by cylinder 7 is necessary.
  • printing is done by conventional means, that is, the ink is introduced to inside each of the screen cylinders and when from the rotation of the cylinder it flows inside and is pushed by a corresponding doctor blade, or other device equivalent, to pass through the sieve representing the drawing to print.
  • the aforementioned offset of the different colored areas is obtained by the fact that the screen cylinder 8 has at least one raised part on which is arranged a sieve allowing the printing of the second zone, the whole being positioned and sized for that the raised part (s) of the screen cylinder 8 do not come into contact with the areas printed by 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 realized according to three constructions different, as shown in the following figures; this second door screen cylinder, according to the first embodiment, reference 18, according to the second embodiment, reference 28 and according to the third form of execution, reference 48.
  • FIG. 2 shows, according to the first embodiment, a screen cylinder 18 provided with raised parts 19 which have the form of concentric rings at the cylinder 18, arranged axially apart from each other others, as best shown in Figure 8.
  • a screen cylinder 18 provided with raised parts 19 which have the form of concentric rings at the cylinder 18, arranged axially apart from each other others, as best shown in Figure 8.
  • the front edge of which is adapted to the shape of the inner periphery of the screen cylinder 18, and therefore has the shape of a comb, whose teeth 12a correspond, both in dimension only in arrangement, to the annular parts 19 embossed to push the ink during printing to through the sieve covering the raised parts 19.
  • the screen cylinder 28 according to the second form as shown in Figures 4 and 9, is provided of raised parts in the form of axial zones 29, spaced apart from each other and spanning the entire length of the cylinder and on which a sieve.
  • the doctor blade 13 mounted inside this cylinder 28 is a conventional doctor blade as shown Figure 5, the front edge is straight. Because axial raised areas of the cylinder 28, this doctor blade 13 is provided with a device allowing it to retract as the cylinder rotates 28 to pass the recessed parts between the zones in relief 29.
  • Figures 6 and 8 in which there is shown schematically the two screen cylinders 7 and 18 as well as a printed sheet of paper 40 shown in Figure 8 in development.
  • the diameter of the screen cylinder 7 and 18 is equal to a third of the diameter of the printing cylinder 6, whose surface corresponds to three leaves.
  • the machine according to FIG. 6 comprises the printing cylinder 6 provided with three rows of pliers 31 housed in notches 30, said clamps 31 being intended to hold the anterior end of a sheet 40 which comes from the transfer cylinder 5 (figure 1) to pass it in front of the two cylinders screen holder 7 and 18.
  • the screen holder cylinder 7 is type proposed in European patent application 0 723 864, and allows conventional printing of the character "a" in a specific color on each bank note printing.
  • This cylinder 7 is provided on its axis of a cam 17 rotating with it and acting on a lever in the form of a square 15, one end of which is provided with a roller 16 corresponding with the cam 17, this angle being under the action of a spring not shown pushing it radially outside towards the sieve.
  • doctor blade by other means including a hydraulic or pneumatic cylinder controlled by an electronic, electromechanical device, etc.
  • the paper 40 passes in front of the second cylinder screen holder 18 for printing the second zone constituted by the character "B".
  • This cylinder 18 is provided with annular raised portions 19 on each from which a sieve is stretched with the drawing to be printed, in this case the letter "B".
  • the raised portions 19 of cylinder 18 are laterally offset in relation to the printing areas of the cylinder 7 including the letter "a”. So when passing from the sheet 40 between the cylinders 6 and 18, the zones already printed by cylinder 7, do not come in contact with cylinder 18 since these areas comprising the "a" are in front of the recessed spaces between two annular zones 19. Thus, the impression can be done in a single pass using the same cylinder without waiting for the printed areas by the cylinder 7 are dried beforehand.
  • This arrangement of the annular zones allows printing zones offset perpendicular to the direction of moving paper 40.
  • doctor blade 12 Inside the screen cylinder 18 is the doctor blade 12, as illustrated in FIG. 3, in the form of a comb with teeth 12a; this doctor blade 12 is mounted, as in the case of the first screen cylinder 7, with one end of a square 21 articulated at its top around a fixed axis 20 and bearing 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 cylinder 7 and acts for the same purpose, namely remove the doctor blade 12 from the inside of the screen when passing in front of the printing slot of a notches 30 of the printing cylinder 6.
  • the second embodiment according to Figures 7 and 9 allows the printing of zones, in the form of characters "a” and "B", offset in the direction of movement of the sheets of paper 41 which again have 5 x 9 ticket prints.
  • the screen cylinder 7, with its doctor blade, its square and the cam 17, 17a, is identical to that of figure 6 and prints the first zones with the letter "a”; the printing cylinder 6 also the same construction as that described in relation with figure 6.
  • the second screen cylinder 28 comprising axial raised areas 29 extending over its entire length has a sieve on each of the parts relief 29 for printing the letter "B" in a other color than the letter "a". This impression is, as can be seen on sheet 41 (figure 9) printed offset in the direction of paper movement.
  • the doctor blade 13 is controlled by a cam 27 fixed to the axis of the cylinder 28 and rotating in synchronism with this one. This doctor blade 13 is fixed at one end a square 25 articulated at its top on an axis fixed 24 and provided at its other end with a roller 26 in permanent contact with a cam 27.
  • this cam 27 reproduces, on a smaller scale, the outline of the screen cylinder 28, in negative, to allow the guide of the doctor blade 13 inside said cylinder 28 so that the doctor blade 13 follows the configuration inside the periphery of cylinder 28. It is provided at the periphery of this cam 27 a portion protruding 27a, corresponding to the part not in relief 28a of the cylinder 28 adapted to a notch 30 of the cylinder 6 and still pushing the print slot simultaneously with one of these notches 30, for remove the doctor blade 13 during the passage. The rest of the periphery of this cam has projecting parts 27b which correspond to the parts 28b located between the raised parts 29 of the cylinder 28.
  • Figure 10 shows the third embodiment, a screen cylinder 48, provided with a screen 49 capable of be elastically deformed.
  • a doctor blade 51 secured to a bracket 52, one end of which is provided with a roller guide 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 square 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 cylinder screen holder 7, so that it moves away from the printing slot when a notch 30 in the cylinder 6 is located in the printing slot.
  • the cylinder screen holder 48 has no raised part, but the raised parts are created in the slot printing by the collaboration of the front edge doctor blade 51 which has teeth 51a and the possibility to elastically deform the screen 49.
  • areas that are in contact with the printing cylinder 6 are the zones of the screen 49 located under the pressure of the teeth 51a of the doctor blade 51.
  • the parts set back 51b of the doctor blade correspond to the printed areas by cylinder 7 or areas you don't want not print, the screen 49 in these areas does not not in contact with the printing cylinder 6. It is obviously essential that the screen 49 does not enter contact with the areas already printed because the ink has not not had time to dry and the dimensions of these zones 51b of the doctor blade are provided accordingly.
  • the screen cylinder 48 is provided between two zones consecutive printing of two distance rings 55.
  • the role of these rings is to ensure that the sieve under the push of the doctor blade 51 will not enter parts in contact with the printing cylinder.
  • the rings 55 have a diameter less than the diameter allowing contact of the screen 49 with the printing cylinder.
  • the rings 55 are located preferably at the ends of areas not in front not come into contact with the printing cylinder.
  • the rings 55 are arranged, preferably but not exclusively on the outside surface of the screen.
  • the invention is not limited to embodiments which have just been described and other variants could be considered, particularly with regard to the configuration of the raised parts of the second screen cylinder, as well as the means to move the doctor blades radially inside these cylinders. Furthermore, the invention also relates to roll printing machines.

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

La présente invention concerne une machine d'impression en sérigraphie comprenant pour l'impression d'au moins une première zone en une couleur déterminée, un cylindre d'impression et un cylindre porte-tamis et au moins un deuxième cylindre porte-tamis coopérant avec le même cylindre d'impression et muni de moyens pour l'impression d'au moins une deuxième zone en une couleur différente de celle de la première zone.The present invention relates to a printing machine in screen printing including for printing at least a first zone in a specific color, a printing cylinder and a screen cylinder and at at least a second screen cylinder cooperating with the same printing cylinder and provided with means for printing at least a second area in one color different from that of the first zone.

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 procède 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 première. 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 the use of printing machines in screen printing comprising a printing cylinder and a screen cylinder for printing an area of a color determined. When you want to print areas juxtaposed or superimposed of another color we proceed upon drying the first impression and then the paper passes through a second machine comprising a printing cylinder and a screen cylinder for printing in superposition or juxtaposition of the second image in a different color from the first. So if it's a full color print a passage for each color is expected after drying of ink from the previous print.

Le US-A-3934502 décrit une machine d'impression en sérigraphie comprenant un cylindre d'impression et au moins deux cylindres porte-tamis coopérant avec le cylindre d'impression pour l'impression d'au moins deux zones, chaque zone ayant une couleur différente de l'autre.US-A-3934502 describes a printing machine in screen printing including a printing cylinder and at least two screen cylinders cooperating with the printing cylinder for printing at least two zones, each zone having a different color from the other.

Le US-A-39 903 63 décrit aussi une machine similaire à la précédente à la différence que les zones imprimées ne se superposent pas et que le deuxième cylindre porte-tamis n'entre pas en contact avec le cylindre d'impression sur la zone imprimée par le premier cylindre porte-tamis.US-A-39 903 63 also describes a machine similar to the previous one with the difference that the printed areas do not overlap and that the second cylinder screen holder does not come into contact with the cylinder printing on the area printed by the first screen cylinder.

Dans le souci 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 sérigraphie. 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.In order to find ways to make it difficult to copy or counterfeit securities, we use different types of printing on a same value paper and among other things we use screen printing. However, the printing of the different designs by different processes and intermediate drying which must take place, lengthen the printing time of documents and registry issues between different prints make these print operations delicate and increase costs by adding of equipment.

La présente invention a pour but de proposer une machine 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 jusqu'ici.The object of the present invention is to propose a machine screen printing of certain areas of a paper by at least two non-overlapping designs and different colors without having to go through drying intermediate and with a relatively simple machine and less bulky than a printing installation in serigraphy in several colors used until now.

La machine d'impression en sérigraphie selon l'invention est caractérisée par le fait que la machine est agencée pour que ladite deuxième zone soit en dehors de la première zone, le deuxième cylindre porte-tamis comprenant au moins une partie en relief sur laquelle est disposé un tamis, ainsi le deuxième cylindre porte-tamis n'entre pas en contact avec le cylindre d'impression sur la ou les zones imprimées par le premier cylindre porte-tamis. The screen printing machine according to the invention is characterized by the fact that the machine is arranged so that said second zone is outside of the first zone, the second screen cylinder comprising at least one raised part on which a sieve is arranged, so the second sieve cylinder does not come into contact with the cylinder on the area or areas printed by the first screen cylinder.

Les avantages de la machine selon l'invention sont les suivants :

  • impression à un seul passage du papier sur un seul cylindre d'impression d'au moins deux zones non superposées 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 cylindre d'impression, donc moins coûteuse;
  • accessoirement il est plus aisé d'obtenir un bon registre entre les images imprimées en sérigraphie successivement au moyen du même cylindre d'impression.
The advantages of the machine according to the invention are as follows:
  • printing with a single passage of the paper on a single printing cylinder of at least two non-superimposed zones in at least two different colors which makes, on the one hand, unnecessary the intermediate drying between the two prints and, on the other hand apart, we have a less bulky machine since we use a single printing cylinder, therefore less expensive;
  • incidentally it is easier to obtain a good register between the images printed in serigraphy successively by means of the same printing cylinder.

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 cylindre porte-tamis. Les moyens dont est muni ce 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 relief qui entrent en contact avec le cylindre d'impression sur des zones non imprimées par le premier cylindre 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. Le premier cylindre porte-tamis peut être un cylindre porte-tamis conventionnel ou, par exemple, comme celui proposé dans la demande de brevet européen 0 723 864 du demandeur (cité selon l'article 54(3)CBE). En évitant de toucher avec le deuxième cylindre 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.These results are of course obtained thanks to the fact that the second zone is printed by a cylinder screen holder provided with means for printing at least a second area of the paper not yet printed and does not not touching the area already printed by the first cylinder screen holder. The means with which this is provided second screen cylinder include at least one part in relief on which is placed a sieve. Thus, it is only the part or parts in relief which come into contact with the print cylinder on areas not printed by the first screen cylinder. Devices pushing ink through the screens are provided inside the screen cylinder, preferably but not exclusively, these devices are doctor blades. The first screen cylinder can be a conventional screen cylinder or, for example, like the one proposed in the request applicant's European patent 0 723 864 (cited in accordance with Article 54 (3) EPC). By avoiding touch the second screen cylinder with the areas already printed during the first pass, it is not necessary to carry out an intermediate drying. he It is obvious that during such impressions, it is necessary maintain sufficient spacing between the two zones to prevent the screen from the second screen cylinder comes into contact with the area beforehand printed.

Selon une variante préférée de l'invention le tamis du premier cylindre est prévu pour imprimer plusieurs zones espacées en une couleur déterminée, le dessin pourrait être le même ou différent pour chaque zone, le deuxième cylindre présente également plusieurs zones en relief permettant d'imprimer un même ou plusieurs dessins en une deuxième couleur dans des espaces laissés par l'impression précédente.According to a preferred variant of the invention, the sieve of first cylinder is intended to print several areas spaced in a specific 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 drawings 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 variant, the machine can include multiple screen cylinders with embossed means for successively printing and by means of a single impression cylinder of the non- superimposed in different colors, the reliefs of different cylinders being arranged so that they do not come into contact when printing with previously printed areas.

Selon une forme d'exécution, les zones en relief du cylindre ou de chacun des cylindres porte-tamis ont une forme axiale s'étendant parallèlement à l'axe du cylindre, le long de la surface de celui-ci sur laquelle est disposé le tamis. Dans ce cas, la racle ou le dispositif équivalent est muni d'un mécanisme permettant son déplacement radial pour pouvoir suivre la configuration du côté intérieur de la périphérie du cylindre, afin de pousser le tamis disposé sur la partie en relief du cylindre et se rétracter lorsque par la rotation du cylindre la partie en retrait vient contre la racle et ainsi de suite.According to one embodiment, the raised areas of the cylinder or each of the screen cylinders have a axial shape extending parallel to the axis of the cylinder, along the surface of it on which the sieve is placed. In this case, the doctor blade or the device equivalent is provided with a mechanism allowing its radial displacement to be able to follow the configuration on the inside of the periphery of the cylinder, in order to push the sieve placed on the raised part of the cylinder and retract when by rotation 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 radial 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 make these movements in the radial direction is a cam rotating in synchronization with the screen cylinder and acting on the end of a lever whose other end is integral with the scrapes.

Selon une autre forme d'exécution, les parties en relief sont des zones annulaires sur lesquelles on applique le tamis et dans ce cas la racle a la forme d'un peigne dont les dents se trouvent en permanence à l'intérieur des zones annulaires pour pousser l'encre à travers le tamis dont sont équipées ces zones annulaires.According to another embodiment, the raised parts are annular areas to which we apply the sieve and in this case the doctor blade has the shape of a comb with teeth permanently inside annular areas to push the ink to through the screen with which these annular zones are fitted.

Selon une autre variante d'exécution, le deuxième cylindre porte-tamis est muni d'un tamis déformable élastiquement 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 tels 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'impression, l'espace entre les dents correspondant à des zones imprimées ou non et avec lesquelles le tamis n'entre pas en contact. En outre, 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 cylindre d'impression.According to another variant, the second cylinder screen holder is fitted with an elastically deformable screen so that contact with the cylinder printing at the right of the printing slot takes place only under the pressure of means such as doctor blade in this case in the form of a comb whose teeth correspond to the areas to be printed by pushing the sieve to come into contact with the printing cylinder, the space between the teeth corresponding to areas printed or not and with which the sieve does not enter not in contact. In addition, the sieve is provided with distance rings to the corresponding spaces between two consecutive areas to be printed preventing the strainer to deform and come into contact with the cylinder printing.

Selon une autre variante d'exécution, la machine est une machine d'impression à la feuille comprenant un cylindre 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'impression.According to another variant, the machine is a sheet printing machine comprising a cylinder printing with at least one notch housing the sheet gripping device, and the means to push the ink out of each screen cylinder include a mechanism to keep them away from sieve 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. The invention will be described in more detail by means of three examples of a sheet-fed printing machine and using the attached drawing.

La figure 1 est une représentation schématique latérale d'une installation comprenant une machine faisant l'objet de la présente invention.Figure 1 is a side schematic representation an installation comprising a machine which is the subject of the present invention.

La figure 2 est une vue schématique de côté d'une première forme d'exécution d'un cylindre porte-tamis présentant 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 having raised portions in the form of rings concentric to the cylinder.

La figure 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 form Figure 2.

La figure 4 est une vue schématique de côté d'une deuxième forme d'exécution du cylindre porte-tamis présentant 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 having raised parts in the form of zones axial.

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.Figure 5 is a side view of the doctor blade used in the screen cylinder of the second form Figure 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 entire print cylinder and two screen cylinders according to a first form of execution.

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 permettant d'expliquer le fonctionnement de la première forme d'exécution selon les figures 2, 3 et 6. Figure 8 is a schematic overview for to explain how the first form works according to Figures 2, 3 and 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.Figure 9 is a representation similar to that of Figure 8 to explain how the second embodiment according to Figures 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.Figure 11 is a side view of the doctor blade used with the screen cylinder in Figure 10.

La figure 12 est une vue en coupe axiale d'un cylindre porte-tamis selon la troisième exécution.Figure 12 is an axial sectional view of a cylinder screen holder according to the third version.

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 imprimer, 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 chaíne 9 qui transporte les feuilles vers les magasins 10 de sortie des feuilles comprenant, dans le cas présent, trois piles.Figure 1 shows a complete installation including one machine for screen printing in two different colors, according to the invention. The installation presents a magazine 1 comprising the sheets to be printed, a feeder 2 for the transfer of sheets along path 3 to a margin cylinder 4, a transfer cylinder 5 for feeding the sheets of paper on a single printing cylinder 6, two screen cylinders 7 and 8 cooperating with the cylinder 6 and a chain clamp system 9 which transports the sheets to the 10 outlet stores 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 partiellement 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 nécessaire.On the printing cylinder 6 which turns in the direction of the arrow, the leaves pass first 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 area not superimposed, therefore outside the areas printed by the first screen cylinder 7, without first having a drying of the areas printed by cylinder 7 is necessary.

En ce qui concerne le fonctionnement des cylindres porte-tamis, l'impression se fait par des moyens conventionnels, 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 dispositif équivalent, pour passer à travers le tamis représentant le dessin à imprimer.Regarding the operation of the cylinders screen holder, printing is done by conventional means, that is, the ink is introduced to inside each of the screen cylinders and when from the rotation of the cylinder it flows inside and is pushed by a corresponding doctor blade, or other device equivalent, to pass through the sieve representing the drawing to print.

Le décalage susmentionné des zones de couleur différente 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 aforementioned offset of the different colored areas is obtained by the fact that the screen cylinder 8 has at least one raised part on which is arranged a sieve allowing the printing of the second zone, the whole being positioned and sized for that the raised part (s) of the screen cylinder 8 do not come into contact with the areas printed by 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 trois 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 et selon la troisième forme d'exécution, la référence 48.The second screen cylinder 8 according to the present invention can be realized according to three constructions different, as shown in the following figures; this second door screen cylinder, according to the first embodiment, reference 18, according to the second embodiment, reference 28 and according to the third form of execution, reference 48.

La figure 2 montre, selon la première forme d'exécution, un cylindre porte-tamis 18 muni de parties en relief 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 peigne, 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.FIG. 2 shows, according to the first embodiment, a screen cylinder 18 provided with raised parts 19 which have the form of concentric rings at the cylinder 18, arranged axially apart from each other others, as best shown in Figure 8. Inside a squeegee is installed on this screen cylinder 18 12, as illustrated in FIG. 3, the front edge of which is adapted to the shape of the inner periphery of the screen cylinder 18, and therefore has the shape of a comb, whose teeth 12a correspond, both in dimension only in arrangement, to the annular parts 19 embossed to push the ink during printing to through the sieve covering the raised parts 19.

Le cylindre porte-tamis 28 selon la deuxième forme d'exécution, tel que représenté figures 4 et 9, est muni de parties en relief en forme de zones axiales 29, écartées les unes des autres et s'étendant 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 rétracter 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 form as shown in Figures 4 and 9, is provided of raised parts in the form of axial zones 29, spaced apart from each other and spanning the entire length of the cylinder and on which a sieve. The doctor blade 13 mounted inside this cylinder 28 is a conventional doctor blade as shown Figure 5, the front edge is straight. Because axial raised areas of the cylinder 28, this doctor blade 13 is provided with a device allowing it to retract as the cylinder rotates 28 to pass the recessed parts between the zones in relief 29.

Pour mieux comprendre la première forme d'exécution, on se réfère aux figures 6 et 8 sur lesquelles on a représenté schématiquement les deux cylindres porte-tamis 7 et 18 ainsi qu'une feuille de papier imprimée 40 montrée sur la figure 8 en développement. Dans le cas présent, 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 feuille 40 est montrée à la figure 8 et elle comporte 5 x 9 = 45 impressions de billets de banque disposées en rangées transversales et longitudinales qui doivent être complétées par deux zones de couleur différente, à savoir, dans le cas considéré, une première zone constituée par le caractère "a" et une deuxième zone constituée par le caractère "B".To better understand the first form of execution, we refers to Figures 6 and 8 in which there is shown schematically the two screen cylinders 7 and 18 as well as a printed sheet of paper 40 shown in Figure 8 in development. In the present case, the diameter of the screen cylinder 7 and 18 is equal to a third of the diameter of the printing cylinder 6, whose surface corresponds to three leaves. Leaf 40 is shown in Figure 8 and has 5 x 9 = 45 banknote prints arranged in rows transverse and longitudinal which must be supplemented by two different colored areas, namely, in the case considered, a first zone constituted by the character "a" and a second zone made up with 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 feuille 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 européen 0 723 864, 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 extrémités 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 extrémité du levier est solidaire de la racle 11. Le but de cette came 17 (comme décrit dans ladite demande de brevet européen 0 723 864) est d'éloigner la racle 11 du côté intérieur du tamis, contre l'action dudit ressort, lorsque 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'endommager le tamis puisqu'à cet endroit le cylindre d'impression 6 ne présente pas une surface contre laquelle le tamis du cylindre 7 s'appuierait sous la pression de la racle 11.For this purpose, the machine according to FIG. 6 comprises the printing cylinder 6 provided with three rows of pliers 31 housed in notches 30, said clamps 31 being intended to hold the anterior end of a sheet 40 which comes from the transfer cylinder 5 (figure 1) to pass it in front of the two cylinders screen holder 7 and 18. The screen holder cylinder 7 is type proposed in European patent application 0 723 864, and allows conventional printing of the character "a" in a specific color on each bank note printing. This cylinder 7 is provided on its axis of a cam 17 rotating with it and acting on a lever in the form of a square 15, one end of which is provided with a roller 16 corresponding with the cam 17, this angle being under the action of a spring not shown pushing it radially outside towards the sieve. The top of the angle of the square 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 patent application European 0 723 864) is to move the doctor blade 11 away from the inside of the sieve, against the action of said spring, when the projecting part 17a of the cam 17 comes in contact with the roller 16 of the bracket 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 no moving the doctor blade away 11 would damage the sieve since at this point the impression cylinder 6 does not have a surface against which the cylinder 7 sieve would lean under pressure from the doctor blade 11.

Il est évident que l'on pourrait piloter la racle par d'autres moyens notamment un vérin hydraulique ou pneumatique commandé par un dispositif électronique, électromécanique, etc.It is obvious that one could pilot the doctor blade by other means including a hydraulic or pneumatic cylinder controlled by an electronic, electromechanical device, etc.

Par la suite, le papier 40 passe devant le deuxième cylindre 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 imprimer, en l'occurrence la lettre "B". On constate que les parties en relief 19 du cylindre 18 sont décalées latéralement 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 comportant 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 cylindre d'impression et sans attendre que les zones imprimées par le cylindre 7 soient préalablement séchées.Thereafter, the paper 40 passes in front of the second cylinder screen holder 18 for printing the second zone constituted by the character "B". This cylinder 18 is provided with annular raised portions 19 on each from which a sieve is stretched with the drawing to be printed, in this case the letter "B". We see that the raised portions 19 of cylinder 18 are laterally offset in relation to the printing areas of the cylinder 7 including the letter "a". So when passing from the sheet 40 between the cylinders 6 and 18, the zones already printed by cylinder 7, do not come in contact with cylinder 18 since these areas comprising the "a" are in front of the recessed spaces between two annular zones 19. Thus, the impression can be done in a single pass using the same cylinder without waiting for the printed areas by the cylinder 7 are dried beforehand.

Cette disposition des zones annulaires permet l'impression des zones décalées perpendiculairement au sens de déplacement du papier 40.This arrangement of the annular zones allows printing zones offset perpendicular to the direction of moving paper 40.

A l'intérieur du cylindre porte-tamis 18 se trouve la racle 12, telle qu'illustrée figure 3, en forme de peigne 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 extrémité 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 savoir 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 form of a comb with teeth 12a; this doctor blade 12 is mounted, as in the case of the first screen cylinder 7, with one end of a square 21 articulated at its top around a fixed axis 20 and bearing 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 cylinder 7 and acts for the same purpose, namely remove the doctor blade 12 from the inside of the screen when passing in front of the printing slot of a 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 également la même construction que celui décrit en relation avec la figure 6.The second embodiment according to Figures 7 and 9 allows the printing of zones, in the form of characters "a" and "B", offset in the direction of movement of the sheets of paper 41 which again have 5 x 9 ticket prints. The screen cylinder 7, with its doctor blade, its square and the cam 17, 17a, is identical to that of figure 6 and prints the first zones with the letter "a"; the printing cylinder 6 also the same construction as that described in relation with figure 6.

Le deuxième cylindre porte-tamis 28 comportant des zones en relief axiales 29 s'étendant sur toute sa longueur 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) imprimée 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 contour du cylindre porte-tamis 28, en négatif, pour permettre le guidage de la racle 13 à l'intérieur dudit cylindre 28 de manière que la racle 13 suive la configuration 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 toujours 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 saillie 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 has a sieve on each of the parts relief 29 for printing the letter "B" in a other color than the letter "a". This impression is, as can be seen on sheet 41 (figure 9) printed offset in the direction of paper movement. The doctor blade 13 is controlled by a cam 27 fixed to the axis of the cylinder 28 and rotating in synchronism with this one. This doctor blade 13 is fixed at one end a square 25 articulated at its top on an axis fixed 24 and provided at its other end with a roller 26 in permanent contact with a cam 27. The shape of this cam 27 reproduces, on a smaller scale, the outline of the screen cylinder 28, in negative, to allow the guide of the doctor blade 13 inside said cylinder 28 so that the doctor blade 13 follows the configuration inside the periphery of cylinder 28. It is provided at the periphery of this cam 27 a portion protruding 27a, corresponding to the part not in relief 28a of the cylinder 28 adapted to a notch 30 of the cylinder 6 and still pushing the print slot simultaneously with one of these notches 30, for remove the doctor blade 13 during the passage. The rest of the periphery of this cam has projecting parts 27b which correspond to the parts 28b located 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 cylindre 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 entraínée 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 cylindre 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 capable of be elastically deformed. Inside this cylinder 48, is disposed a doctor blade 51 secured to a bracket 52, one end of which is provided with a roller guide 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 square 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 cylinder screen holder 7, so that it moves away from the printing slot when a notch 30 in the cylinder 6 is located 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 possibilité de se déformer élastiquement du tamis 49. Ainsi, les zones qui sont en contact avec le cylindre d'impression 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 imprimées par le cylindre 7 ou les zones que l'on ne désire 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 cylinder screen holder 48 has no raised part, but the raised parts are created in the slot printing by the collaboration of the front edge doctor blade 51 which has teeth 51a and the possibility to elastically deform the screen 49. Thus, areas that are in contact with the printing cylinder 6 are the zones of the screen 49 located under the pressure of the teeth 51a of the doctor blade 51. The parts set back 51b of the doctor blade correspond to the printed areas by cylinder 7 or areas you don't want not print, the screen 49 in these areas does not not in contact with the printing cylinder 6. It is obviously essential that the screen 49 does not enter contact with the areas already printed because the ink has not not had time to dry and the dimensions of these zones 51b of the doctor blade are provided accordingly.

Enfin, sur la figure 12 nous avons représenté en coupe axiale et une échelle différente à la troisième forme d'exécution représentée à la figure 10.Finally, in Figure 12 we have shown in section axial and a different scale to the third embodiment shown in Figure 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 espace en fonction de la largeur de la zone que l'on ne désire pas mettre en contact avec le cylindre d'impression. 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 situés 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 zones consecutive printing of two distance rings 55. We could be satisfied with only one ring per space depending on the width of the area that we don't do not wish to contact the printing cylinder. The role of these rings is to ensure that the sieve under the push of the doctor blade 51 will not enter parts in contact with the printing cylinder. In For this purpose, the rings 55 have a diameter less than the diameter allowing contact of the screen 49 with the printing cylinder. The rings 55 are located preferably at the ends of areas not in front not come into contact with the printing cylinder. The rings 55 are arranged, preferably but not exclusively on the outside 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 concerne 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 embodiments which have just been described and other variants could be considered, particularly with regard to the configuration of the raised parts of the second screen cylinder, as well as the means to move the doctor blades radially inside these cylinders. Furthermore, the invention also relates to roll printing machines.

Il est également possible de prévoir plus de deux cylindres 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 et pour autant que les dimensions et l'emplacement desdits cylindres le permettent, pour donner la possibilité d'imprimer plus de deux zones non superposées en couleurs différentes avec un seul cylindre d'impression.It is also possible to provide more than two cylinders screen holder, with parts in contact with the printing cylinder offset relative also well to the areas printed by cylinder 7 than to those printed by cylinder 8 or 28 or 48 and for as much as the dimensions and location of said cylinders allow it, to give the possibility to print more than two areas not overlapped in color different with a single printing cylinder.

Claims (13)

  1. A screen printing machine comprising, for printing at least one first area in a defined color, an impression cylinder (6) and a screen cylinder (7), and at least one second screen cylinder (8; 18; 28), interacting with the same impression cylinder (6) and being provided with means (19; 29) for printing at least one second area in a different color from that of the first area, characterised in that the machine is organized so that the said second area is outside the first area, the second screen cylinder comprising at least one raised part (19; 29) on which a screen is arranged so the second screen cylinder (8; 18; 28) does not come into contact with the impression cylinder (6) on the area(s) printed by the first screen cylinder (7).
  2. The machine as claimed in claim 2, characterised in that the first screen cylinder (7) is equipped with a screen for printing several spaced-apart areas and wherein the second screen cylinder (8; 18; 28) has several raised parts (19; 29) for printing the areas not printed by the first screen cylinder (7).
  3. The machine as claimed in claim 1 or 2, characterised in that the raised parts of the second screen cylinder (18) are annular areas (19).
  4. The machine as claimed in claim 1 or 2, characterised in that the raised parts of the second screen cylinder (28) are axial areas (29).
  5. The machine as claimed in claim 1 or 4, characterised in that the screen cylinders (7; 8; 18; 28) are provided on their inside with means (11; 12; 13) for pushing the ink against the internal side of the screen.
  6. The machine as claimed in claims 3 and 5, characterised in that said ink-pushing means (12) of the second screen cylinder (18) are designed so that they engage only the annular raised areas (19) and are preferably formed by a squeegee (12) which has the shape of a comb whose teeth (12a) enter the annular areas of said screen cylinder (18).
  7. The machine as claimed in claims 4 and 5, characterised in that said ink-pushing means (13) of the second screen cylinder (28) are provided with a mechanism (25, 27) in order to be moved radially in such a manner that they follow the configuration of the internal periphery of the screen cylinder (28).
  8. The machine as claimed in claim 7, characterised in that said mechanism comprises a cam (27) designed to be rotated in synchronism with the screen cylinder (28) acting on a lever (25) fastened to the squeegee (13).
  9. A screen printing machine comprising, for printing at least one first area in a defined color, an impression cylinder (6), a screen cylinder (7), and at least one second screen cylinder (8; 48), interacting with the same impression cylinder (6) and being provided with means (51a) for printing at least one second area in a different color from that of the first area, characterised in that the machine is organized so that the said second area is outside the first area, the second screen cylinder (48) comprises an elastically deformable screen (49) and means (51) pushing the screen and the ink radially outward only over the areas to be printed in order to bring the screen (49) into contact with the impression cylinder (6) over said areas, and in that the means pushing the screen (49) radially outward is a squeegee (51) in the shape of a comb whose teeth (51a) correspond to the areas to be printed, and between two consecutive areas to be printed the screen is provided with at least one ring (55) which prevents the screen from deforming and from contacting the impression cylinder.
  10. The machine as claimed in claim 9, characterised in that the screen (49) includes two rings (55) delimiting each area which has not to come into contact with the impression cylinder.
  11. The machine as claimed in one of claims 9 or 10, characterised in that said rings (55) are arranged outside the screen (49).
  12. The machine as claimed in one of claims 1 to 11, which comprises other screen cylinders for printing other areas not overlapping the above previously printed areas, each in a different color, and in that these screen cylinders have means arranged so as to print areas lying between the already printed areas, the machine being designed so that each of the screen cylinders does not come into contact with the impression cylinder on the previously printed areas.
  13. The machine as claimed in one of claims 1 to 12, characterised in that said machine is a sheet-fed printing machine comprising an impression cylinder with at least one notch (30), and in that said ink-pushing means of each screen cylinder (7, 8, 18, 28, 48) especially the squeegees, comprise a mechanism (17, 15; 23, 21; 27, 25; 50, 52) enabling them to move away from the screen when a notch passes into the impression 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
CH732/96 1996-03-21
CH73296 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 EP0889783A1 (en) 1999-01-13
EP0889783B1 true 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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EP1447234A1 (en) 2003-02-13 2004-08-18 Kba-Giori S.A. Printing process on a security element and security element
WO2005000585A1 (en) * 2003-06-30 2005-01-06 Kba-Giori S.A. Printing machine
EP1582349A1 (en) * 2004-03-30 2005-10-05 Kba-Giori S.A. Printing process and machine
EP1602483A1 (en) 2004-06-03 2005-12-07 Kba-Giori S.A. Intaglio printing machine and process
CN100360311C (en) * 2005-12-26 2008-01-09 中国印钞造币总公司 Multi-color silk screen printing method and equipment
AU2007200128B8 (en) * 2006-01-17 2013-02-07 Viavi Solutions Inc. Apparatus for orienting magnetic flakes
ITMO20060127A1 (en) * 2006-04-19 2007-10-20 Pont Massimiliano Dal PRESS APPARATUS
JP5069896B2 (en) * 2006-10-23 2012-11-07 株式会社小森コーポレーション Liquid supply device
EP1961559A1 (en) 2007-02-20 2008-08-27 Kba-Giori S.A. Cylinder body for orienting magnetic flakes contained in an ink or varnish vehicle applied on a sheet-like or web-like substrate
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CN103739212A (en) * 2013-12-20 2014-04-23 南京凯尚信息科技有限公司 Vacuum glass high-efficient distribution and support unit
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Also Published As

Publication number Publication date
AU2090297A (en) 1997-10-10
EP0889783A1 (en) 1999-01-13
DE69702504T2 (en) 2001-04-19
RU2160671C2 (en) 2000-12-20
ATE194548T1 (en) 2000-07-15
US6109172A (en) 2000-08-29
CN1273293C (en) 2006-09-06
UA52653C2 (en) 2003-01-15
KR100453836B1 (en) 2004-12-30
CN1216500A (en) 1999-05-12
WO1997034767A1 (en) 1997-09-25
DE69702504D1 (en) 2000-08-17
JP2000506461A (en) 2000-05-30
JP4260885B2 (en) 2009-04-30
AU709046B2 (en) 1999-08-19
KR20000064726A (en) 2000-11-06

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