EP0561474A1 - 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
EP0561474A1
EP0561474A1 EP93200783A EP93200783A EP0561474A1 EP 0561474 A1 EP0561474 A1 EP 0561474A1 EP 93200783 A EP93200783 A EP 93200783A EP 93200783 A EP93200783 A EP 93200783A EP 0561474 A1 EP0561474 A1 EP 0561474A1
Authority
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.)
Granted
Application number
EP93200783A
Other languages
German (de)
English (en)
Other versions
EP0561474B1 (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
Original Assignee
Stork X Cel BV
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Filing date
Publication date
Application filed by Stork X Cel BV filed Critical Stork X Cel BV
Publication of EP0561474A1 publication Critical patent/EP0561474A1/fr
Application granted granted Critical
Publication of EP0561474B1 publication Critical patent/EP0561474B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Manufacturing Of Printed Wiring (AREA)
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
NL9200494A NL9200494A (nl) 1992-03-17 1992-03-17 Inrichting voor substraat transport door drukinrichting en zeefdrukmachine.
NL9200494 1992-03-17

Publications (2)

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

Family

ID=19860566

Family Applications (1)

Application Number Title Priority Date Filing Date
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

Country Status (5)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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.
WO1998053996A1 (fr) * 1997-05-28 1998-12-03 Stork Screens B.V. Procede et dispositif de transport en registre de feuilles dans une machine a imprimer
ES2123350A1 (es) * 1994-05-25 1999-01-01 Ind Maquinaria Serigrafia Y Gr Perfeccionamientos introducidos en las maquinas de impresion serigrafica de productos unitarios rigidos y semirigidos.
US6592121B2 (en) 2000-11-30 2003-07-15 Heidelberger Druckmaschinen Ag Apparatus for synchronizing transfers of sheet material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1213863C (zh) 1998-03-24 2005-08-10 斯泰纳曼技术股份公司 印张上光的方法和装置及其应用

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR338658A (fr) * 1903-12-15 1904-06-01 Dick Company Soc Ab Perfectionnements aux machines à imprimer aux patrons
US2363137A (en) * 1941-06-30 1944-11-21 Howard H Metcalf Method and apparatus for printing
US2364277A (en) * 1942-01-30 1944-12-05 John B Dey Printer
US2660115A (en) * 1949-01-07 1953-11-24 Ras Max Circumferential cylinder register mechanism for rotary printing machines
US2703526A (en) * 1951-02-15 1955-03-08 Hedemora Verkst Er Ab Reciprocatory feed means for rotary printing machines
US3155034A (en) * 1961-11-01 1964-11-03 Rineglas Inc Silk screen printing press
US3853315A (en) * 1968-06-17 1974-12-10 H Dahlgren Sheet feeder for printing presses
FR2272838A1 (fr) * 1974-05-30 1975-12-26 Almedahls Ab
US4081723A (en) * 1975-05-02 1978-03-28 Veb Polygraph Leipzog Kombinat Fur Polygraphische Maschinen Und Ausrustungen Printing machine
DE3629003A1 (de) * 1985-08-30 1987-03-12 Herbert Haller Offset-bogendruckmaschine
EP0218860A2 (fr) * 1985-10-10 1987-04-22 International Business Machines Corporation Dispositif pour délivrer de la pâte à souder en continu
DE4039700A1 (de) * 1989-12-26 1991-06-27 Riso Kagaku Corp Rotations-siebdruckmaschine mit einem netzgewebe-formzylinder

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR338658A (fr) * 1903-12-15 1904-06-01 Dick Company Soc Ab Perfectionnements aux machines à imprimer aux patrons
US2363137A (en) * 1941-06-30 1944-11-21 Howard H Metcalf Method and apparatus for printing
US2364277A (en) * 1942-01-30 1944-12-05 John B Dey Printer
US2660115A (en) * 1949-01-07 1953-11-24 Ras Max Circumferential cylinder register mechanism for rotary printing machines
US2703526A (en) * 1951-02-15 1955-03-08 Hedemora Verkst Er Ab Reciprocatory feed means for rotary printing machines
US3155034A (en) * 1961-11-01 1964-11-03 Rineglas Inc Silk screen printing press
US3853315A (en) * 1968-06-17 1974-12-10 H Dahlgren Sheet feeder for printing presses
FR2272838A1 (fr) * 1974-05-30 1975-12-26 Almedahls Ab
US4081723A (en) * 1975-05-02 1978-03-28 Veb Polygraph Leipzog Kombinat Fur Polygraphische Maschinen Und Ausrustungen Printing machine
DE3629003A1 (de) * 1985-08-30 1987-03-12 Herbert Haller Offset-bogendruckmaschine
EP0218860A2 (fr) * 1985-10-10 1987-04-22 International Business Machines Corporation Dispositif pour délivrer de la pâte à souder en continu
DE4039700A1 (de) * 1989-12-26 1991-06-27 Riso Kagaku Corp Rotations-siebdruckmaschine mit einem netzgewebe-formzylinder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 294 (M-730)11 August 1988 & JP-A-63 071 349 (MATSUSHITA ELECTRIC IND CO) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2123350A1 (es) * 1994-05-25 1999-01-01 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.
WO1997046387A1 (fr) * 1996-06-04 1997-12-11 Stork X-Cel B.V. Barrette de connexion pour serigraphie et ensemble constitue d'une barrette et d'une trame de serigraphie
WO1998053996A1 (fr) * 1997-05-28 1998-12-03 Stork Screens B.V. Procede et dispositif de transport en registre de feuilles dans une machine a imprimer
US6592121B2 (en) 2000-11-30 2003-07-15 Heidelberger Druckmaschinen Ag Apparatus for synchronizing transfers of sheet material

Also Published As

Publication number Publication date
EP0561474B1 (fr) 1995-10-18
DE69300644T2 (de) 1996-11-07
NL9200494A (nl) 1993-10-18
ATE129186T1 (de) 1995-11-15
DK0561474T3 (da) 1996-03-11
DE69300644D1 (de) 1995-11-23

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