EP0561474B1 - Dispositif de transport d'un support à travers un dispositif d'impression et machine à imprimer sérigraphique - Google Patents

Dispositif de transport d'un support à travers un dispositif d'impression et machine à imprimer sérigraphique Download PDF

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Publication number
EP0561474B1
EP0561474B1 EP93200783A EP93200783A EP0561474B1 EP 0561474 B1 EP0561474 B1 EP 0561474B1 EP 93200783 A EP93200783 A EP 93200783A EP 93200783 A EP93200783 A EP 93200783A EP 0561474 B1 EP0561474 B1 EP 0561474B1
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EP
European Patent Office
Prior art keywords
holding means
printing
path
articles
screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93200783A
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German (de)
English (en)
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EP0561474A1 (fr
Inventor
Marius Joseph Derks
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.)
Stork X Cel BV
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Stork X Cel BV
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Publication date
Application filed by Stork X Cel BV filed Critical Stork X Cel BV
Publication of EP0561474A1 publication Critical patent/EP0561474A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/16—Printing tables
    • B41F15/18—Supports for workpieces
    • B41F15/28—Supports for workpieces for elongated flat articles, e.g. strips, bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/16—Printing tables

Definitions

  • the present invention relates to a device of the type described in the preamble of claim 1.
  • Such a device is known from US patent specification 3853315, which relates to a device for the throughfeed and bilateral printing of articles, the articles being held by holding means spaced apart and fixed on endless belts.
  • This device is also provided with means for guiding the holding means during the printing operation.
  • printing rollers provided with a recess in the periphery for allowing through said holding means.
  • the object of the present invention is to provide a device of the type mentioned above which permits accurate positioning in place and time along at least the part of the path where the articles can be printed.
  • the articles it must be possible for the articles to be all discrete sheet-type materials which are common in the industrial and printing markets, with a great diversity in thickness, surface area and weight, for example printed circuit boards.
  • the above device can interact with feed means for placing articles for printing in position, which means consist of conveyors, for example a conveyor belt, for conveying each article for printing against a positioning cam, and of transfer means for transferring articles lying against the positioning cam, one at a time, over the same distance to a holding means, the holding means being disposed at the same position on the path in each case.
  • feed means for placing articles for printing in position consist of conveyors, for example a conveyor belt, for conveying each article for printing against a positioning cam, and of transfer means for transferring articles lying against the positioning cam, one at a time, over the same distance to a holding means, the holding means being disposed at the same position on the path in each case.
  • Articles can be fed in either continuously or intermittently. The latter applies in particular for cases where the articles are fed in manually, as a result of which relatively long waiting times occur. The printing rollers are sometimes stopped during these long waiting times.
  • the feed means for placing the articles for printing in position can also consist of conveyor means for conveying said articles to a waiting position, and of transfer means for transferring one article at a time from the waiting position to a holding means.
  • the transfer means like the holding means, can be provided with stop cams which, after acceleration of the transfer means, run against stop cams of the holding means, with the result that both means are positioned accurately relative to each other, and following which both means are also running at the same speed.
  • the transfer means are driven by a mechanical drive which follows a specific curve recorded in a specific drive program by means of which the transfer means can be positioned accurately. This increases the reliability and accuracy even at high speeds.
  • the transfer means can be provided with clamping means consisting of a top and bottom arm, or with suction means, for example suction nozzles, by which the articles can be picked up, held and released by means of vacuum, without being damaged.
  • the guide means, the drive means of the first type and the resetting means together can consist of one driven endless chain or toothed belt, which is supported at two positions at least, and along which the holding means are fixed at regular intervals. This greatly benefits the simplicity of the construction.
  • the drive means of the first type can move the holding means by means of compressed air.
  • the holding means can then be moved independently of each other, which is not possible if a chain or toothed belt is used as the first drive means.
  • the drive means of the first type can also move the holding means by means of magnetic force, with the result that the holding means can be moved independently of each other, and regulation of this movement is possible without mechanical valves, which are liable to wear.
  • a device according to the invention i.e. a drive means of a second type which at least temporarily takes over the movement of each holding means along at least part of the path where the articles can be printed, is accurate positioning thereof in place and time along said part of the path. For, high accuracy can be ensured in this way on the part of the path where that is necessary, and for the rest a less accurate first drive means will suffice.
  • An advantageous embodiment of the device according to the invention is formed if the drive means of the second type consists of a lead screw placed parallel to the path, while each holding means is fitted with at least one cam which can engage with the lead screw.
  • the cam can be mounted on bearings on the holding means, so that the cam can roll along the lead screw, and a reduction in wear is possible. If the cam is conical in this case, the drive means of the second type can acquire a very high positioning accuracy.
  • the drive means of the second type consists of an at least externally toothed endless belt which runs parallel to the path and is supported at two points at least, and at least one tooth per holding means which can engage with the toothed belt.
  • the drive means of the second type consists of a ground endless chain which is provided with pointed teeth on the outside, and which runs parallel to the path and is supported at least at two points, and if at least one pointed tooth per holding means can engage with the ground chain.
  • the holding means are provided with guide means which essentially prevent movement in the plane in which the articles are being printed, other than in the direction of the path.
  • These guide means can be formed by a profile which is fitted parallel to the path, and by each holding means having three or four rollers thereon, the axes of which are perpendicular to the plane in which the articles are being printed, and which rest against the profile in pairs on either side during the passage of the holding means.
  • the discharge means for removing articles for printing from the holding means situated in an end position can comprise a conveyor which is disposed essentially in line with the path at a short distance from the end thereof, at which end the chain or toothed belt with holding means fixed thereon is deflected by a roller.
  • the distance from the conveyor to the chain or toothed belt is in each case temporarily increased, in order to allow each holding means to pass unimpeded.
  • a second conveyor can also be provided here before the end of and essentially parallel to the path, which conveyor takes over the carrying of the articles from the holding means and guides said articles to the conveyor lying essentially in line with the path. The purpose of both conveyors is to discharge articles coming from the holding means.
  • a recess is advantageously provided in the printing forme, so that the holding means can pass through.
  • the invention also relates to a screen printing machine such as described in claim 15, in which the machine contains a device according to the invention as described above.
  • the supporting roller of the screen printing machine is provided with a recess which serves to allow the holding means to pass through between the printing roller and the supporting roller.
  • the material of the screen can be made of a metal such as, for example, nickel, produced by electroforming. It is preferable to use high-mesh material for this, on account of the low deformation of this material.
  • the screen can be provided with strips, extending along the edges in the peripheral direction of the printing roller. In that case the screen can be stretched in the axial direction by two cylindrical rings gripping behind the strips.
  • the squeegee can advantageously be removed from the inside of the printing roller while the bridge is passing, thereby preventing excessive wear of the squeegee.
  • a cam which imposes this movement on the squeegee can be provided on the inside of the printing roller.
  • the printing roller can be adjusted in longitudinal register by two meshing gear wheels provided with oblique teeth. The adjustment is carried out by shifting one of these two gear wheels along an axis of rotation.
  • Fig. 1 shows a device according to the invention in which the articles for printing are conveyed by a conveyor 1 against a positioning cam 2, thereafter are transferred one by one over the same distance in each case to a holding means 4 by means 3 which are provided with clamping means, comprising a bottom and a top arm, for holding the articles, the holding means 4 being disposed at the time on an essentially straight path in the same initial position.
  • the holding means bears the article 5 for printing and is itself supported by an endless chain 6 which is stretched over pulleys 7 and at the same time serves as drive means of a first type, while the holding means 4 fixed thereto with play in the direction of the path moves out of the initial position of the path and passes along a printing forme 100 with recess 101 for allowing through the holding means 4 towards an end position (left and right respectively in the figure, as shown).
  • the device according to the invention being a drive means of a second type 8, then temporarily takes over the movement of the holder 4 and ensures accurate positioning in place and time along the part of the path over which it is operating.
  • Discharge means are formed by a conveyor 9, which is fitted before the end of the path, runs parallel thereto and takes over the articles from the holding means 4 and conveys them to another conveyor 10 lying in line with the path.
  • a holding means 4 Whenever a holding means 4 has to pass, the distance between the latter conveyor 10 and the chain 6 is temporarily increased for the purpose, by means of a compressed air cylinder 12 which is hingedly fixed to the machine frame 11.
  • the chain is also used to return the holding means 4 to the initial position.
  • the conveyors 9 and 10 are kept under tension by tensioning devices 13 and 14 respectively, which are known per se.
  • FIGs 2a to 2d show in detail the holding means 4, which is driven by the device according to the invention indicated by reference number 8 in Fig. 1, which is a drive means of the second type, which in Figures 2a and 2b is formed by a lead screw 15 which is placed parallel to the path and engages with a cam 17 mounted on bearings on the holding means 4.
  • the holding means 4 is fixed to a link 20 of the supporting chain 6 by means of a pin 21 which engages with play in a hole 22. This play ensures that the movement of the chain 6 does not have to correspond exactly to the movement imposed on the holding means by the lead screw 15 and guide 23.
  • Figure 2c shows a different embodiment of the invention, in which the drive means 8 of the second type is formed by an endless toothed belt 51 provided with teeth on the outside and on the inside and running parallel to the path, which belt runs over a toothed belt wheel 53, and by at least one holding means 4 which is provided with teeth which mesh with the toothed belt.
  • the drive means 8 of the second type is formed by a ground endless chain 52 provided on the outside with pointed teeth and running parallel to the path, which chain runs over a chain wheel 54, and by a holding means 4 which is provided with pointed teeth which mesh with the ground chain.
  • Fig. 2e shows diagrammatically a possible position of the transfer means relative to a holding means, in which a sheet to be printed can be transferred very accurately to the holding means.
  • the transfer means 57 in this case falls partially into the openings of the holding means 4.
  • Both the transfer means and the holding means are provided on either side with stop cams 55 and stop cams 56 respectively, which lie against each other in this position.
  • the device shown in Fig. 1 is extended to a screen printing machine in Fig. 3, by adding a printing roller 25 and supporting roller 26 and the drive means necessary for the purpose.
  • a screen 35 is stretched along the periphery on the printing roller 25.
  • the squeegee 27 is removed from the inside of the printing roller whenever the bridge 28 is passing.
  • a recess 29 is provided in the supporting roller, in order to allow the holding means 4 to pass freely.
  • Fig. 4 is a diagrammatic representation of a printing roller containing a squeegee 31, which printing roller is made up of two end rings 33 with a bridge 34 between them, which stretches along the periphery between the dashed lines, and a screen 35 which is stretched with the aid of register pins 36 and dividing tensioning rings 30, 37 which grip behind polyurethane strips glued on the screen, and which printing roller is rotatably driven in oblique teeth 38.
  • the squeegee can rotate about a shaft 32 which runs at a distance from and parallel to the axis of rotation of the printing roller and is raised by cam 39, which imposes a movement on the squeegee by means of a rod mechanism, so that the squeegee does not touch the passing bridge 34.
  • the printing roller can rotate in its entirety in bearings (not shown) which are provided around the ends of the roller. In order to prevent twisting of the printing roller, it can, of course, be provided with teeth at both ends and be driven.
  • Fig. 6 shows the principle applied in order to increase the distance between the printing roller 25 and the supporting roller 26, so that they lie clear of each other. This ensures that, for example, if no articles for printing are being passed through, printing ink is prevented from being applied to the supporting roller 26 by the printing roller 25.
  • the printing roller 25 is accommodated by means of a bearing 62 in a disc 60 which is situated eccentrically relative to the printing roller, and which is accommodated by means of a bearing 63 in the frame of the screen printing machine. Before the printing roller 25 is moved upwards, the squeegee is placed in an off position by a rod mechanism.
  • the disc 60 Due to the fact that the printing roller lies eccentrically in the disc 60, as a result of the retraction of the driving rod into the pneumatic cylinder 61, the disc 60 can be rotated through an angle in the frame, with the result that the printing roller 25 is moved upwards.
  • a screen printing device of the type described above is built, for example, for articles with dimensions of maximum 1400 mm by 1000 mm and can achieve a printing speed of 4000 articles per hour, during which a printed image with an accuracy of 0,1 mm can be obtained.
  • the printing forme to be used expediently comprises a screen material of nickel, formed by electroforming, which can be a fineness of 20-500 mesh and higher (the mesh number is the number of screen openings per linear inch) and a thickness of between 50 and 300 micrometres. Of course, finenesses and thicknesses deviating from the above can also be used.

Claims (22)

  1. Dispositif pour transporter des objets (5) à imprimer à travers un dispositif d'impression équipé d'au moins un châssis d'impression apte à être déplacé en rotation, comprenant au moins un moyen de retenue (4) situé dans une position initiale pour recevoir un par un un objet flexible ou non flexible (5) à imprimer, moyen de retenue (4) qui est supporté par des moyens de guidage et qui peut être déplacé par un moyen d'entraînement (6) d'un premier type de la position initiale jusqu'à une position terminale le long d'une trajectoire essentiellement rectiligne qui s'étend le long du châssis d'impression (100), tandis que des moyens de repositionnement sont prévus pour ramener le ou les moyens de retenue (4) le long de la même trajectoire ou d'un trajectoire différente de la position terminale à la position initiale après déchargement de l'objet (5) imprimé, caractérisé en ce qu'il est également prévu un moyen d'entraînement (8) d'un second type qui prend en charge au moins temporairement le déplacement de chaque moyen de retenue (4) sur une partie au moins de la trajectoire où les objets (5) peuvent être imprimés, afin de permettre leur positionnement précis à un endroit et à un moment donnés le long de ladite partie de la trajectoire.
  2. Dispositif selon la revendication 1, caractérisé en ce que le moyen d'entraînement (8) du second type est formé par une tige filetée (15) disposée parallèlement à la trajectoire, et par au moins une came (17) par moyen de retenue (4), capable de venir en prise avec la tige filetée.
  3. Dispositif selon la revendication 2, caractérisé en ce que la came (17) est fixée sur des roulements prévus sur le moyen de retenue (4) afin de pouvoir rouler le long de la tige filetée (15).
  4. Dispositif selon la revendication 3, caractérisé en ce que la came (17) est conique.
  5. Dispositif selon la revendication 1, caractérisé en ce que le moyen d'entraînement du second type est formé par une courroie dentée sans fin (51) qui s'étend parallèlement à la trajectoire et qui est supportée au niveau d'au moins deux points, et par au moins une dent par moyen de retenue (4), capable d'engrener avec la courroie dentée (51).
  6. Dispositif selon la revendication 1, caractérisé en ce que le moyen d'entraînement du second type est formé par une chaîne sans fin aiguisée (52) qui est pourvue de dents pointues sur sa face extérieure et qui s'étend parallèlement à la trajectoire en étant supportée au niveau d'au moins deux points, et par au moins une dent pointue par moyen de retenue (4), capable d'engrener avec la chaîne aiguisée (52).
  7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce que chaque moyen de retenue (4) est muni de moyens de guidage supplémentaires (23, 24) qui empêchent essentiellement des déplacements dans le plan dans lequel les objets (5) sont imprimés, autres que dans le sens de la trajectoire.
  8. Dispositif selon la revendication 7, caractérisé en ce que les moyens de guidage supplémentaires sont formés par un profilé (23) disposé parallèlement à la trajectoire, et en ce que chaque moyen de retenue (4) possède, montés sur lui, des galets (24) dont les axes sont perpendiculaires au plan dans lequel les objets (5) sont imprimés et qui s'appuient contre le profilé (23) par paires de chaque côté pendant le passage du moyen de retenue (4).
  9. Dispositif selon la revendication 7, caractérisé en ce que les moyens de guidage supplémentaires sont formés par un profilé (23) disposé parallèlement à la trajectoire, et en ce que chaque moyen de retenue (4) possède, montés sur lui, des galets (24) dont les axes sont perpendiculaires au plan dans lequel les objets (5) sont imprimés et qui sont placés de manière à s'appuyer contre le profilé pendant le passage du moyen de retenue (4), le galet central, considéré dans le sens de la trajectoire, étant situé au niveau d'un côté différent du profité par rapport aux deux autres galets (24).
  10. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que des moyens d'entraînement (8) du second type sont prévus le long de plusieurs parties de la trajectoire où un rouleau d'impression est respectivement installé, moyens d'entraînement qui sont capables de prendre en charge le déplacement de chaque moyen de retenue (4) et d'assurer son positionnement précis à un endroit et à un moment donnés le long de ces parties de la trajectoire.
  11. Dispositif selon la revendication 1, caractérisé en ce que le moyen de retenue (4) et le moyen de transfert (57) sont tous deux pourvus d'une ou de plusieurs cames d'arrêt (55, 56) grâce auxquelles les deux moyens peuvent s'étendre en étant positionnés très précisément l'un contre l'autre.
  12. Dispositif selon la revendication 11, caractérisé en ce que lorsque le moyen de transfert (57) est en appui par la came d'arrêt (55) contre la came d'arrêt (56) du moyen de retenue (4), le moyen de transfert (57) se déplace à la même vitesse que le moyen de retenue (4).
  13. Dispositif selon l'une au moins des revendications 1 à 12, caractérisé en ce que le dispositif peut coopérer avec des moyens de déchargement destinés à enlever les objets (5) à imprimer des moyens de retenue (4), qui sont situés dans une position terminale et comprennent un transporteur (10) disposé en alignement avec la trajectoire à une faible distance de l'extrémité de celui-ci, extrémité au niveau de laquelle la chaîne ou la courroie dentée (6) comportant, fixés sur elle, les moyens de retenue (4) est déviée par une poulie (7), convoyeur (10) à partir duquel la distance jusqu'à la chaîne ou la courroie dentée (6) est à chaque fois augmentée temporairement pour permettre le passage sans entrave de chaque moyen de retenue, et qui sert à décharger les objets (5) provenant des moyens de retenue (4).
  14. Dispositif selon la revendication 13, caractérisé en ce que les moyens de déchargement comprennent également un second transporteur (9) disposé en amont de l'extrémité de la trajectoire et essentiellement parallèlement à celle-ci, convoyeur qui prend en charge le transport des objets (5) à partir des moyens de retenue (4) et qui guident lesdits objets jusqu'au convoyeur (10) situé essentiellement en alignement avec la trajectoire.
  15. Machine à sérigraphier comprenant un rouleau d'impression (25) et un rouleau de support (26) qui coopèrent avec celui-ci, rouleaux entre lesquels les objets (5) à imprimer peuvent être déplacés et imprimés, et dans laquelle le rouleau d'impression se compose de deux extrémités annulaires rigides (33) reliées entre elles par un chevalet rigide (34) et comporte un écran (35) tendu sur une partie de sa périphérie, écran (35) qui est fixé dans la direction périphérique par des chevilles d'alignement (36) disposées sur le chevalet entre les extrémités annulaires (33) et qui est soumis à une pré-tension dans la direction axiale, et rouleau d'impression (25) à l'intérieur duquel est montée une raclette (31) qui ne se déplace pas solidairement avec lui et qui est destinée à faire passer par pression un moyen d'impression à travers l'écran (35), la machine comprenant un dispositif selon l'une au moins des revendications 1 à 14.
  16. Machine à sérigraphier selon la revendication 15, caractérisée en ce qu'un creux (29) est prévu dans le rouleau de support (26) pour permettre le passage du moyen de retenue (4) entre le rouleau d'impression (25) et le rouleau de support.
  17. Machine à sérigraphier selon la revendication 15 ou 16, caractérisée en ce que l'écran (35) est pourvu le long de ses bords de bandes qui s'étendent dans la direction périphérique du rouleau d'impression (25).
  18. Machine à sérigraphier selon la revendication 17, caractérisée en ce que l'écran (35) peut être tendu dans la direction axiale par deux anneaux cylindriques (30, 37) qui viennent en prise en arrière des bandes.
  19. Machine à sérigraphier selon l'une des revendications 15 à 18, caractérisée en ce que la raclette (31) peut être déplacée depuis l'intérieur du rouleau d'impression (25) pendant le passage du chevalet (34).
  20. Machine à sérigraphier selon la revendication 19, caractérisée en ce qu'une came (38) qui impose le déplacement à la raclette (31) est montée à l'intérieur du rouleau d'impression (25).
  21. Machine à sérigraphier selon l'une des revendications 15 à 20, caractérisée en ce que le rouleau d'impression (25) peut être ajusté en ce qui concerne un alignement longitudinal par deux roues dentées engrenées (38, 40) pourvues de dents obliques, l'une de ces deux roues dentées pouvant, à cet effet, être déplacée le long de son axe de rotation.
  22. Machine à sérigraphier selon l'une des revendications 15 à 21, caractérisée en ce que le rouleau d'impression (25) comporte une possibilité d'ajustement pour permettre d'ajuster sa distance par rapport au rouleau de support (26) grâce au fait que le rouleau d'impression (25) est monté sur des roulements dans un disque (60) disposé d'une manière excentrique par rapport à lui, disque (60) qui est monté sur des roulements dans la machine à sérigraphier et qui peut être entraîné en rotation par un moyen d'entraînement.
EP93200783A 1992-03-17 1993-03-17 Dispositif de transport d'un support à travers un dispositif d'impression et machine à imprimer sérigraphique Expired - Lifetime EP0561474B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9200494 1992-03-17
NL9200494A NL9200494A (nl) 1992-03-17 1992-03-17 Inrichting voor substraat transport door drukinrichting en zeefdrukmachine.

Publications (2)

Publication Number Publication Date
EP0561474A1 EP0561474A1 (fr) 1993-09-22
EP0561474B1 true EP0561474B1 (fr) 1995-10-18

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EP93200783A Expired - Lifetime EP0561474B1 (fr) 1992-03-17 1993-03-17 Dispositif de transport d'un support à travers un dispositif d'impression et machine à imprimer sérigraphique

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Country Link
EP (1) EP0561474B1 (fr)
AT (1) ATE129186T1 (fr)
DE (1) DE69300644T2 (fr)
DK (1) DK0561474T3 (fr)
NL (1) NL9200494A (fr)

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ES2123350B1 (es) * 1994-05-25 1999-07-01 Ind Maquinaria Serigrafia Y Gr Perfeccionamientos introducidos en las maquinas de impresion serigrafica de productos unitarios rigidos y semirigidos.
NL1003264C2 (nl) * 1996-06-04 1997-12-10 Stork X Cel Bv Verbindingsstrook voor een drukzeef, alsmede samenstel van een dergelijke strook en een drukzeef.
NL1006150C2 (nl) * 1997-05-28 1998-12-01 Stork X Cel Bv Drukwerkwijze, drukinrichting, alsmede samenstel van drukinrichting en invoereenheid.
AU2709799A (en) 1998-03-24 1999-10-18 Steinemann Ag Method and device for coating sheets and use of said method
DE10155033B4 (de) 2000-11-30 2014-09-18 Heidelberger Druckmaschinen Ag Vorrichtung zur Synchronisation von Übergaben bogenförmigen Materials

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Publication number Publication date
ATE129186T1 (de) 1995-11-15
DK0561474T3 (da) 1996-03-11
NL9200494A (nl) 1993-10-18
DE69300644T2 (de) 1996-11-07
EP0561474A1 (fr) 1993-09-22
DE69300644D1 (de) 1995-11-23

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