EP0412318A2 - Machine sérigraphique à régime intermittent - Google Patents

Machine sérigraphique à régime intermittent Download PDF

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Publication number
EP0412318A2
EP0412318A2 EP90113574A EP90113574A EP0412318A2 EP 0412318 A2 EP0412318 A2 EP 0412318A2 EP 90113574 A EP90113574 A EP 90113574A EP 90113574 A EP90113574 A EP 90113574A EP 0412318 A2 EP0412318 A2 EP 0412318A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
gripper
grippers
bar
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.)
Withdrawn
Application number
EP90113574A
Other languages
German (de)
English (en)
Other versions
EP0412318A3 (en
Inventor
Gerd Quast
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0412318A2 publication Critical patent/EP0412318A2/fr
Publication of EP0412318A3 publication Critical patent/EP0412318A3/de
Withdrawn legal-status Critical Current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
    • B41F15/22—Supports for workpieces for single sheets
    • 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

Definitions

  • the invention relates to a screen printing machine of the type mentioned in the preamble of claim 1.
  • Such machines work on the so-called stop cylinder principle. Your cylinder only runs in the printing direction of the screen carriage and stops when it returns.
  • the advantage of this construction is that the arc can be placed at rest at the stops of the cylinder during long periods of inactivity and can be gripped by the cylinder grippers. The sheet is drawn through the cylinder itself during the print run under the squeegee. It can be achieved with this construction highest fit.
  • a disadvantage of this design is that the sheets can only be transferred from the cylinder to a sheet delivery after a considerable angular revolution around the cylinder, since otherwise no clean separation of the sheet from the screen (bounce) is achieved.
  • the elbows must therefore be so flexible that they extend the circumference of the cylinder over a longer curve can follow. Rigid, poorly bendable sheet material cannot be processed with such screen printing machines.
  • the object of the present invention is therefore to provide a screen printing machine of the type mentioned at the outset which can also process stiffer sheet materials while maintaining the accuracy of fit of the stop cylinder principle.
  • the sheets are placed on the cylinder and transported from there to just behind the doctor blade.
  • this first movement section which is most important for the accuracy of fit, installation and transport take place from the cylinder itself and thus with the highest achievable fit.
  • the required bending of the sheet around the cylinder is so small, however, that even very stiff sheet material can be processed.
  • Shortly behind the squeegee is the transfer point at which the sheet is transferred from the cylinder grippers to the bar grippers and is now transported in a straight line using this known principle. It is therefore possible to print sheets of very stiff material with the greatest accuracy.
  • Such a screen printing machine can be changed easily and quickly from the operating mode for rigid sheets to the operating mode for flexible sheets. In the operating mode for flexible sheets, it works like a conventional screen printing machine of the type mentioned in the preamble of claim 1.
  • the kinematic problems when driving the gripper bar can be ideally solved with a chain drive.
  • the anvils of the gripper bar which determine the path of the leading edge of the sheet, can thus be guided with great precision on the cylinder circumference between the stop position and the transfer point with a movement which completely corresponds to that of the leading edge of the sheet still guided by the cylinder.
  • the path of the anvils coincides exactly with the path of the leading edge of the sheet, so that stretching or compression of the sheet is avoided.
  • FIG. 1 to 3 show a screen printing machine according to the invention in a perspective view in three successive operating phases.
  • a sieve carriage 1 is designed as a rectangular frame in which the sieve 2 is stretched.
  • a squeegee 3 is arranged above the sieve, which, stationary in the sieve plane, is held perpendicularly to the latter by means not shown.
  • a cylinder 4 is arranged, with its axis exactly under the squeegee 3. With gear means, not shown, the cylinder 4 and the screen carriage 1 are connected such that when the cylinder 4 rotates about its axis, the screen 2 on the Cylinder jacket is rolled.
  • the screen trolley runs in the direction of arrow F 1 in the direction of the print run, in which the squeegee 3, as shown in FIG. 2, is lowered onto the screen.
  • a sheet 5 can be created in the direction of arrow F1 from a plant table, not shown.
  • the system takes place directly on the cylinder at stops 6 provided on a surface line, of which only one is shown in the figure for simplification.
  • the stops 6 are provided on the contact edge 7 of the cutout 8 of the cylinder 4.
  • a gripper shaft 9 is arranged which carries a plurality of cylinder grippers 10, only one of which can be seen in the figure.
  • the cylinder grippers 10 can close and clamp the front edge of the sheet 5 in contact with the contact edge 7 on the cylinder jacket.
  • the contact edge 7 of the cylinder 4 is in the printing direction, that is, in the direction of arrow F1 just before the doctor blade 3, so slightly below the screen. Now begins the print run in the direction of arrow F1 of the screen 3, the cylinder 4 rotates synchronously with this in the direction of arrow F2 and pulls the sheet 5 under the squeegee 3.
  • guide rails 11 are provided, in which parallel sliding blocks 12 are guided, between which a gripper bar 13 is held.
  • This consists of a fixed rod 14, which carries several anvils 15, and a gripper shaft 16, which carries a plurality of strip grippers 17. To simplify the drawing, only one anvil 15 with associated gripper 17 is shown in the figures.
  • the bar grippers 17 are in alignment with the cylinder grippers 10.
  • the anvils 15 protrude under the front edge of the sheet 5 into recesses 18 in the contact edge 7 of the cylinder 4.
  • the bar grippers 17 are in the stop position of the screen printing machine shown in FIG. 1, however, open.
  • the machine After starting in the printing direction, that is in the direction of arrows F1 and F2, the machine first moves into the position of FIG. 2, in which the grippers 10 and 17 are at the transfer point. In this position of the machine, as shown in FIG. 2, the cylinder grippers 10 open, while the strip grippers 17 close. The leading edge of the sheet 5 is thus transported further from the gripper bar 13 from the transfer point shown in FIG. 2, as shown in FIG. 3 at a somewhat later point in time.
  • the guide rails 11 are designed such that they run downwards at an angle to the screen from the transfer point shown in FIG. 2. In this way it is achieved that the sheet 5 is cleanly separated from the screen.
  • the curvature around the cylinder 4 is so small that even very stiff arches, e.g. Cardboard boxes or plastic plates can be processed with the screen printing machine shown.
  • the guide rails 11 are designed between the transfer point (FIG. 2) and their end point, in which the gripper bar 13 is in the stop position of FIG. 1, in such a way that they approximately follow the cylinder circumference in this area.
  • the anvils 15 of the gripper bar 13 are guided on a curve which, from the transfer point in FIG. 2 to the stop position in FIG. 1, follows the cylinder circumference with a slight downward tilt towards the end of the curve, so that it is in the position shown in FIG 1 stop position shown can move under the curve 5 without contact.
  • the drive of the gripper bar 13 is taken over by a chain 19 which engages the sliding blocks 12. This must be driven so that it moves precisely with the speed of the cylinder jacket or the screen 2. Only in this way can it be ensured that the sheet 5, which is held on the one hand by the gripper bar 13 and on the other hand slips on the cylinder 4 without slipping, is transported without compression or expansion.
  • the chain 19 runs with its center, that is to say the axis centers of the chain joints, in the area between the stop position in FIG. 1 and the transfer point in FIG. 2 exactly on the circumference of the cylinder.
  • the anvils 15 are at an altitude relative to the chain 19, that their surfaces lie exactly on the chain center.
  • the chain 19 is driven with sprockets, not shown, which are synchronized with the cylinder 4 in such a way that the chain is driven precisely at the circumferential cylinder speed.
  • the screen printing machine shown so far is intended for printing rigid sheets 5. After a simple switchover, it can also be used in a conventional manner for thin, flexible sheets. Then the gripper bar 13 is not required, which is disengaged and stopped in the vicinity of its end point of movement in the direction of arrow F 1, that is to say in the figures on the left outside of the drawing area shown. The cylinder grippers 10 are then controlled somewhat differently, in such a way that they remain closed beyond the transfer point shown in FIG. 2, up to the delivery point shown in FIG. 3, at which they transfer the sheet onto a sheet delivery 20, which is conventional, for example in the form of a driven suction belt.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
EP19900113574 1989-08-05 1990-07-16 Stop-cylinder silk-screen machine Withdrawn EP0412318A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3926004 1989-08-05
DE19893926004 DE3926004A1 (de) 1989-08-05 1989-08-05 Siebdruckmaschine mit stoppzylinder

Publications (2)

Publication Number Publication Date
EP0412318A2 true EP0412318A2 (fr) 1991-02-13
EP0412318A3 EP0412318A3 (en) 1991-07-31

Family

ID=6386620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900113574 Withdrawn EP0412318A3 (en) 1989-08-05 1990-07-16 Stop-cylinder silk-screen machine

Country Status (2)

Country Link
EP (1) EP0412318A3 (fr)
DE (1) DE3926004A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180162116A1 (en) * 2016-12-12 2018-06-14 Atma Champ Enterprise Corporation Rotary printing machine
EP3335878A1 (fr) * 2016-12-16 2018-06-20 ATMA Champ Ent. Corp. Presse d' impression
CN117162240A (zh) * 2023-09-08 2023-12-05 中建材创新科技研究院有限公司 一种石膏板高精度自清洁切断装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006051558A1 (fr) * 2004-11-10 2006-05-18 Kameswaran Blasubramanian Machine de sérigraphie servo synchronisée

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870703A (en) * 1955-12-30 1959-01-27 Autoscreen Mfg Company Ltd Screen printing machines
US3221649A (en) * 1963-04-15 1965-12-07 Poster Products Inc Screen printing apparatus
AU2911471A (en) * 1971-05-20 1972-11-23 P. A. Tooling And Engineering Pty. Limited Printing apparatus
US4771690A (en) * 1987-04-24 1988-09-20 Ernst W. Dorn Company, Inc. Screen printing apparatus for limited flexibility stock

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180162116A1 (en) * 2016-12-12 2018-06-14 Atma Champ Enterprise Corporation Rotary printing machine
US10173413B2 (en) * 2016-12-12 2019-01-08 Atma Champ Enterprise Corporation Rotary printing machine
EP3335878A1 (fr) * 2016-12-16 2018-06-20 ATMA Champ Ent. Corp. Presse d' impression
CN117162240A (zh) * 2023-09-08 2023-12-05 中建材创新科技研究院有限公司 一种石膏板高精度自清洁切断装置

Also Published As

Publication number Publication date
DE3926004A1 (de) 1991-02-07
EP0412318A3 (en) 1991-07-31

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