EP0289472B1 - Siebdruckmaschine - Google Patents

Siebdruckmaschine Download PDF

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Publication number
EP0289472B1
EP0289472B1 EP19880850107 EP88850107A EP0289472B1 EP 0289472 B1 EP0289472 B1 EP 0289472B1 EP 19880850107 EP19880850107 EP 19880850107 EP 88850107 A EP88850107 A EP 88850107A EP 0289472 B1 EP0289472 B1 EP 0289472B1
Authority
EP
European Patent Office
Prior art keywords
gripper
printing table
printing
stencil
printer according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19880850107
Other languages
English (en)
French (fr)
Other versions
EP0289472A3 (en
EP0289472A2 (de
Inventor
Sylve Jack Donald Ericsson
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.)
Svecia Screen Printing Systems AB
Original Assignee
Svecia Screen Printing Systems AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Svecia Screen Printing Systems AB filed Critical Svecia Screen Printing Systems AB
Publication of EP0289472A2 publication Critical patent/EP0289472A2/de
Publication of EP0289472A3 publication Critical patent/EP0289472A3/en
Application granted granted Critical
Publication of EP0289472B1 publication Critical patent/EP0289472B1/de
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
    • B41F15/08—Machines
    • B41F15/0804—Machines for printing sheets
    • B41F15/0813—Machines for printing sheets with flat screens
    • B41F15/0827—Machines for printing sheets with flat screens with a stationary squeegee and a moving screen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/04—Grippers

Definitions

  • the present invention relates to a silkscreen printer, as stated in the preamble of claim 1.
  • the British Patent Specification No. 1 467 910 teaches a silkscreen printer of the kind which comprises a reciprocatingly movable cylindrical printing table or drum and (although not shown) a frame or frame-carriage, in which a stencil is held stretched and which is reciprocatingly movable in the horizontal plane, this horizontal, reciprocal movement of the stencil frame being controlled by the movement of the drum or printing table.
  • This known printer also includes a gripper arrangement for holding firmly the sheet of material to receive print, here referred to as the print receiving material.
  • the gripper is mounted on the printing drum and is moved by the drum in a circular path, which is coincidental with the upper printing surface of the drum.
  • the present invention can be said to constitute a further development of the silkscreen printer described and illustrated in the aforementioned British Patent Specification.
  • Another predominant technical problem resides in the provision of conditions, with the aid of simple means, whereby registration of the gripper can be effected, in spite of the large oscillating masses and high kinetic energies involved, solely by stopping the lightweight gripper and its attachment means, which engender only small kinetic energy, in a registered position relative to the printer chassis or to some other reference point, such as the registration of the material to receive print.
  • the present invention relates to a silkscreen printer, as stated in the preamble of claim 1.
  • a silkscreen printer constructed in accordance with the present invention reside in the provisions of conditions which enable the gripper and the print receiving material to be registered in relation to the printer chassis or some other reference point while taking up the limited kinetic energy engendered by the gripper, therewith dispensing with the necessity of also bringing the stencil frame and printing table to registered positions.
  • the stencil and the print material are in mutually registered positions during a printing operation, as a result of first bringing the stencil into a position of registry with the gripper and the print receiving material held thereby and thereafter taking measures to transfer the stencil pattern onto the print receiving material.
  • Figure 1 is a schematic perspective view of part of a silkscreen printing machine 1 comprising a curved printing table 2, which exhibits a cylindrically curved printing surface 2a, the printer being intended to apply print to a print receiving material 3.
  • the illustrated printer also comprises a stencil 4, which is streteched in a stencil frame 5 in a conventional manner, only part of the stencil being shown in the Figure.
  • Figure 1 illustrates the print material 3 with its forwardly located end of edge 3a located adjacent standard registering devices, positioned on respective sides of the cylinder printing surfaces 2a. Immediately adjacent the registering devices are holding-down devices, which are intended to hold and press the forwardly located end 3a of a thin print receiving material against the printing surface 2a.
  • the printing table moves to the right, as shown by an arrow in Figure 1, therewith causing the frame 5 and stencil 4 also to move to the right.
  • a squeegee device 7 which is stationary in relation to the printer chassis, is located in a position in which it co-acts with the stencil 4 and presses ink paste (not shown), which has been deposited on the stencil 4, through perforations present in the stencil and down onto the underlying print receiving material 3.
  • the leading edge 3a of the print material 3 is gripped by means of two gripping devices, hereinafter referred to as grippers, each comprising respective gripping fingers and being firmly arranged in the printing surface 2a of the cylinder.
  • the illustrated printer also comprises a squeegee device 7 or squeegee arrangement, which is illustrated schematically, and which is intended to press the stencil 4 against the print material 3 and the printing table 2 in a conventional manner, such as to transfer print onto the print material 3, located between the printing table and the stencil.
  • the printing table 2 and its surface 2a co-acts with the aforesaid two grippers, which are intended to hold the print material 3 firmly at its leading edge 3a, as seen in the direction of movement, during preferably the whole of a printing sequence, and in all events during at least part of said printing sequence.
  • the squeegee device 7 is arranged to be lowered during a printing sequence, so as to press the stencil 4 against the print receiving material and the printing table surface 2a at the uppermost or highest point of the printing table 2, and is held in this position as the print material 3 is displaced to the right in Figure 1 by the grippers.
  • the gripper 8 may be arranged to move along said printing surface 2a in a direction which extends in the direction of the longitudinal extension of the stencil frame or in its direction of movement during the printing operation.
  • Figure 2 illustrates how a print receiving material 3, and particularly the leading edge 3a of said material, takes a precisely registered position in relation to the printer chassis 10.
  • Figure 2 illustrates the printing table 2 and the gripper 8 during movement towards a gripper registering position (a registration position for the gripping operation itself), namely in which a surface 11 on the gripper 8 is in co-action with a surface 12 on a first stop means 13, which is stationary in relation to the chassis 10.
  • FIG. 3 shows that when the printing table is moved further to the left, the gripper 8 will abut the first stop means 13, therewith stopping further movement of the gripper, the gripper 8 in this position can grip the leading edge 3a of the print receiving material with its gripping fingers 8a and 8b.
  • Figure 3 shows the gripper 8 in co-action with first stop means 13, provided on the printer chassis, although it will be understood that some other reference point may be chosen.
  • Figures 2 and 3 are intended to show that further displacement of the frame and the printing table 2 to the left, beyond the registered position of the gripper 8, can now take place without changing the position of the gripper 8 in relation to the stop means 13. During this movement of the gripper however, a spring 16 is allowed to expand or extend, such as to hold the gripper in the registered position.
  • the gripper 8 comprises a multiple of reaction support surfaces or anvil surfaces 8b and a multiple of upwardly and downwardly movable fingers 8a which are intended to clamp the leading edge part 3a of a registered print receiving material 3 in the gripper registering position illustrated in Figure 3.
  • the stencil is first moved relative to the gripper 8 and the print material 3 until the gripper 8 engages a second stop means, which is formed when the surfaces 14 and 15 are brought into abutment with one another, wherewith the stencil is registered in relation to the gripper 8 and printing can be effected with both gripper 8 and material 3 and the stencil 4, or frame 5, being located in mutually registered positions.
  • the position of the first stop means 13, and therewith the registering position of the gripper 8 can be adjusted with the aid of an externally screw-threaded stud, which is arranged to cooperate with an internally screw-threaded sleeve, the stud and sleeve not being shown in detail in order not to complicate the drawing.
  • the printing table 2 and the stencil frame 5 of the illustrated embodiment are allowed to travel slightly beyond the registered position of the gripper 8.
  • the gripper is thus located in a registered position in relation to the chassis, in which position the gripper is able to grasp and collect a sheet of print material 3 which has been registered precisely with the aid of other means intended for this purpose and which is intended for a subsequent printing sequence.
  • the registered position of the gripper 8 can be adjusted with the aid of the stop means 13, this adjusted position thus applying to a multiple of printing sequences.
  • the gripper 8 is pivotable and "loosely" mounted on the printing cylinder and that in a printing position or a return position the gripper is pressed against a stop in the printing cylinder 2 which causes the gripper 8, upon gripper movement to the left in Figure 1, to stop against a first stop means 13 which is stationary in relation to the printer stand or printer chassis, and in such a registered position is caused to engage a sheet of print material 3 which is registered in this position, while allowing the stencil frame 5 and the printing cylinder 2 to continue to move, preferably through a considerable distance, during extension of the spring 16, but with the gripper 8 loosely pivotally adapted so that it still remains in its registered position.
  • the gripper 8 is first brought to a registered position in relation to the frame 5 and the stencil 4, via movement of the printing table 2, whereafter the actual printing operation takes place with the gripper 8, the print material 3 and the frame 5 and stencil 4 correctly positioned in relation to one another.
  • the movement damper which functions as a first stop means 13, may be modified to provide a well defined terminal position (a first stop) for the gripper 8 when the gripper rests against said stop under the bias exerted by the spring 16.
  • the elongated member 20 is intended to extend in a direction related to the radius 21 of the curved printing table 2, such that said outer end and the gripping devices 8a and 8b are located on one side of the radius while the rotatable attachment 20a is located on the other side of the radius.
  • the rotatable attachment 20a is located at a distance b from the rotational centre 2' of the curved printing table, this distance preferably being 15 to 50 % of the length of the radius, preferably about 30 %.
  • the elongated member 20 is arranged such that when the printing table 2 returns towards and beyond the registered position of the gripper 8 subsequent to a printing sequence, the member is inclined at an angle "a" to the direction of movement of the printing table.
  • the gripper 8 returns to the position illustrated in Figure 2 upon commencement of a following printing sequence.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Collation Of Sheets And Webs (AREA)

Claims (12)

  1. Siebdrucker (1) mit einem Drucktisch, vorzugsweise einem zylindrischen Drucktisch (2), geeignet zum Aufbringen eines Druckbildes auf einen Bedruckstoff (3) und eine Schablone (4) aufweisend, die in einem Schablonenrahmen (5) aufgespannt ist und sich über dem Drucktisch befindet, und mit einer Rackelvorrichtung (7), die die Schablone gegen den Drucktisch drücken soll, um so das Druckbild auf den sich zwischen dem Drucktisch und der Schablone befindenden Bedruckstoff zu übertragen, und weiterhin mit einem Greifer, der während zumindest einem Teil des Druckablaufs den vorderen Endteil (3a), mit Blickrichtung in Bewegungsrichtung, des Bedruckstoffes (3) greifen soll, dadurch gekennzeichnet, daß der Greifer (8) am Drucktisch (2) in dessen Längsrichtung und in Bewegungsrichtung des Bedruckstoffes bewegbar angebracht ist und in seiner für den Greifvorgang registergetreuen Position mit einer Federvorrichtung gegen ein erstes Anschlagmittel (13) gedrückt werden kann.
  2. Drucker nach Anspruch 1, gekennzeichnet durch Mittel zum Einstellen der Position des ersten Anschlagmittels (13).
  3. Drucker nach Anspruch 1, dadurch gekennzeichnet, daß sich das erste Anschlagmittel (13) am Druckergestell oder Druckerständer befindet und in bezug auf diesen ortsfest ist.
  4. Drucker nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß der Drucktisch (2) und Schablonenrahmen (5) so angeordnet sind, daß sie über eine Position, in der sich nur der Greifer (8) in registergetreuer Position befindet, hinausgelangen können.
  5. Drucker nach Anspruch 1, dadurch gekennzeichnet, daß das erste Anschlagmittel (13) in Form eines Bewegungsdämpfers vorliegt, der eine klar definierte Endposition hat.
  6. Drucker nach Anspruch 5, dadurch gekennzeichnet, daß das erste Anschlagmittel (13) in Form eines hydraulischen Dämpfers oder einer ähnlichen Vorrichtung vorliegt.
  7. Drucker nach Anspruch 1 oder 10, dadurch gekennzeichnet, daß sich der vorne befindliche Teil des Greifers (8), der den Bedruckstoff (3) greifen soll, in etwas erhöhter Position, d.h. einer registergetreuen Position, befindet.
  8. Drucker nach Anspruch 1 oder 7, dadurch gekennzeichnet, daß der Greifer (8) am äußeren Ende eines länglichen Gliedes (20) befestigt ist, das an seinem anderen Ende schwenkbar befestigt (20a) ist.
  9. Drucker nach Anspruch 8, dadurch gekennzeichnet, daß das längliche Glied (20) so angeordnet ist, daß es sich in eine mit dem Radius (21) eines bogenförmigen Drucktisches (2) in Beziehung stehende Richtung erstreckt, so daß sich das äußere Ende und der Greifer (8a, 8b) auf einer Seite des Radius befinden, während sich die Schwenkbefestigung (20a) auf der anderen Seite davon befindet.
  10. Drucker nach Anspruch 9, dadurch gekennzeichnet, daß sich die Schwenkbefestigung in einem Abstand (b) vom Drehzentrum (2') des bogenförmigen Drucktisches befindet.
  11. Drucker nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß das längliche Glied (20) so angeordnet ist, daß es sich von der Schwenkbefestigung (20a) aus in Bewegungsrichtung des Drucktisches neigt, wenn der Drucktisch nach einem Druckablauf zu einer registergetreuen Position des Greifers und darüber hinweg zurückkehrt.
  12. Drucker nach Anspruch 11, dadurch gekennzeichnet, daß das längliche Glied (20) so angeordnet ist, daß es sich in Richtung des Radius erstreckt, wenn der Greifer eine registergetreue Position einnimmt und wenn der Ducktisch sich über diese Position hinaus bewegt, so daß das längliche Glied den Greifer über die Bedruckfläche des Drucktisches hebt.
EP19880850107 1987-04-15 1988-03-29 Siebdruckmaschine Expired - Lifetime EP0289472B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8701572A SE460034B (sv) 1987-04-15 1987-04-15 Stenciltryckmaskin med fjaedrande gripare i tryckbord
SE8701572 1987-04-15

Publications (3)

Publication Number Publication Date
EP0289472A2 EP0289472A2 (de) 1988-11-02
EP0289472A3 EP0289472A3 (en) 1990-02-28
EP0289472B1 true EP0289472B1 (de) 1994-11-09

Family

ID=20368210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880850107 Expired - Lifetime EP0289472B1 (de) 1987-04-15 1988-03-29 Siebdruckmaschine

Country Status (4)

Country Link
EP (1) EP0289472B1 (de)
JP (1) JPH0825263B2 (de)
DE (1) DE3852058T2 (de)
SE (1) SE460034B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8801644L (sv) * 1988-05-02 1989-11-03 Svecia Silkscreen Maskiner Ab Stenciltryckmaskin

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE654716C (de) * 1935-07-28 1937-12-29 Dresden Leipziger Schnellpress Haltzylinderschnellpresse
SE375511B (de) * 1973-08-13 1975-04-21 Svecia Silkscreen Maskiner Ab

Also Published As

Publication number Publication date
EP0289472A3 (en) 1990-02-28
SE460034B (sv) 1989-09-04
SE8701572D0 (sv) 1987-04-15
JPH0825263B2 (ja) 1996-03-13
DE3852058T2 (de) 1995-03-23
SE8701572L (sv) 1988-10-16
EP0289472A2 (de) 1988-11-02
DE3852058D1 (de) 1994-12-15
JPS63297041A (ja) 1988-12-05

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