EP0452722B1 - Machine de sérigraphie - Google Patents

Machine de sérigraphie Download PDF

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Publication number
EP0452722B1
EP0452722B1 EP91104972A EP91104972A EP0452722B1 EP 0452722 B1 EP0452722 B1 EP 0452722B1 EP 91104972 A EP91104972 A EP 91104972A EP 91104972 A EP91104972 A EP 91104972A EP 0452722 B1 EP0452722 B1 EP 0452722B1
Authority
EP
European Patent Office
Prior art keywords
printing
screen
sheet
gripper
cylinder
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
EP91104972A
Other languages
German (de)
English (en)
Other versions
EP0452722A1 (fr
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 EP0452722A1 publication Critical patent/EP0452722A1/fr
Application granted granted Critical
Publication of EP0452722B1 publication Critical patent/EP0452722B1/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
    • B41F15/22—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/10—Machines for multicolour printing

Definitions

  • the invention relates to a screen printing machine of the type mentioned in the preamble of claim 1.
  • Such a screen printing machine is known from DE-PS 10 47 214.
  • the sheets can be placed in register in the gripper bars.
  • the registration accuracy of the gripper rods compared to the screen which is important for the pressure register, is not guaranteed, since inaccuracies in the chain in the area of the pressure cylinder can lead to small displacements of the gripper rod.
  • the bow system on the gripper bars can only be reached during start / stop operation.
  • the object of the present invention is therefore to provide a screen printing machine of the type mentioned at the outset which can print with better register accuracy and faster.
  • the gripper bar is so far decoupled from the chain with a certain longitudinal play that fine displacements in the area of the register accuracy are made possible.
  • the form-fitting engagement of the gripper bar on the printing cylinder achieves a registration that is accurate in terms of registration, in which the gripper bar is decoupled from the chain inaccuracies due to its longitudinal play. A significantly improved printing accuracy is therefore achieved.
  • the storage of the gripper bar with longitudinal play on the chain also allows improvements in the area of the plant equipment which can be used for continuous, that is to say faster, machine operation.
  • the features of claim 2 are advantageously provided.
  • the sheet is pulled off the screen quickly and safely. Only then can the arc run away tangentially from the cylinder. If the gripper bar does not run tangentially, that is to say on a path that is extended relative to the arc, it is achieved that the gripper bar runs somewhat behind the subsequent arc. This ensures that the gripper bar cannot advance in relation to the leading edge of the sheet under all operating conditions.
  • the registration of the sheet leading edge in the gripper bar is thus also ensured behind the impression cylinder, which is particularly advantageous when further registration-accurate processing of the sheet is required behind the impression cylinder, for example in a second downstream printing unit.
  • Fig. 1 shows a highly schematic longitudinal section of a screen printing machine with which two colors, namely the colors red and green are to be printed in the example.
  • two corresponding printing units R and G are provided in succession.
  • a drying unit T is arranged to enable high working speeds.
  • the sheets to be printed are entered into the machine on a system device AL and output at a discharge device AT.
  • the two printing units R and G are identical. They each have a pressure cylinder 1 and a screen carriage 2 with screen 3, which is arranged tangentially to the pressure cylinder 1 to and fro, with a pressure stroke in the direction of the solid arrow and a return stroke in the direction of the dashed arrow.
  • a doctor blade 5 is arranged above the axis 4 of the printing cylinder 1 and can be moved up and down in the direction of the arrow.
  • Chains run on both sides of the machine, of which only one chain 6 is shown in the illustration in FIG. 1. 1, this extends over part of the circumference of the pressure cylinder of each of the two cylinders 1.
  • Fig. 2 one of the printing units in the area of the printing cylinder 1 is shown enlarged.
  • the gripper rod 9 has an anvil rod 10 parallel to the axis 4 of the pressure cylinder 1 and a pivotable gripper shaft 11.
  • the anvil rod 10 and the gripper shaft 11 are supported at their ends in a holder 15 which (in the highly schematic exemplary embodiment shown) is mounted with elongated holes 16 on pins 17, which in turn are fastened to links of the chain 6 shown.
  • the holder 15 and thus the entire gripper bar 9 can thus be moved relative to the chain by a play predetermined by the elongated holes 16.
  • the chain 6 runs on the printing cylinder 1 over its circumference, specifically on a chain wheel arranged on the axis 4 of the printing cylinder 1, the tips 18 of which can be seen in FIG is coupled.
  • the pressure cylinder 1 shows in the area of the holder 15 the usual essentially rectangularly shaped cut-out 19 running parallel to its axis 4, in which the essential parts of the gripper rod 9 shown are immersed as the cylinder 1 passes.
  • This cutout 19 has a trapezoidal groove 20 into which two rollers 21 arranged on the holder 15 engage in a form-fitting manner.
  • the gripper bar has detected a sheet 14 at its front edge, applied it to the pressure cylinder in the manner shown and now moves further in the direction of the chain, that is to say from left to right in the illustrated chain 6 pathway.
  • the squeegee is moved downward and presses the screen 3 onto the sheet 14.
  • Gear engagement means, not shown, between the pressure cylinder 1 and the trolley 2 provide z. B. in the manner of a pinion rack engagement for driving the printing carriage 2.
  • the sheet 14 is now printed.
  • the front edge of the sheet 14 held between the grippers 13 and anvils 12 of the gripper bar 9 now runs over an angle piece to the position denoted by P and then a little further along the circumference of the pressure cylinder.
  • the exact path of the leading edge of the sheet is determined by the mandatory path of the holder 15, which results from the chain path, which in turn, as shown in FIG. 2, is predetermined by a chain guide 23.
  • the sheet 14 will lie against the printing cylinder surface up to approximately P and then run away from the printing cylinder approximately on the broken line.
  • the chain guide 23 ensures, however, that the chain does not run in this area on the dashed line, that is to say on the path taken by the arch 14, but that the chain does not run tangentially here, that is to say deviating from a tangent lying on the pressure cylinder circumference. In this area, the leading edge of the sheet runs a longer way than the subsequent parts of the sheet.
  • the special guidance of the sheet 14 and the chain 6 shown in FIG. 2 when leaving the impression cylinder 1 is particularly suitable for thin, highly flexible sheets, in which it must be ensured that the sheet behind the squeegee 5 is quickly detached from the screen 3 at the greatest possible angle that he would otherwise like to stick to. If, on the other hand, the construction is to be designed for stiffer material, for example cardboard, the chain behind the pressure cylinder 1 can run at a flatter angle to the sieve, the detour with the chain guide 23 possibly being omitted.
  • the system table 24 ends shortly before the chain wheel 8 around which the chain 6 rotates.
  • the holder 15 is adjusted here in the same way as on the pressure cylinder 1 in a trapezoidal groove 27 of a side plate of the chain wheel 8. It is adjusted directly on the sprocket 8 so that inaccuracies in the chain system on the rim of the sprocket 8 in the elongated holes 16 of the holder 15 can be compensated.
  • the holder and thus the gripper bar 9 is thus adjusted directly in relation to the chain wheel 8, which is in high-precision synchronous connection with the pressure cylinder 1 and thus with the screening carriage 2.
  • a swivel gripper 28 which has swivel gripper anvils 30 fixed on a swivel gripper shaft 29 and grippers 31 movable in the direction of the arrow in the guide shown.
  • the swivel gripper 28 with anvil 30 and gripper 31 grips the front edge of the sheet 14 '.
  • the contact mark 26 opens and the swivel gripper shaft 29 pivots counterclockwise until the front edge of the sheet is transferred to the gripper bar 9, which now closes while the swivel gripper 28 opens.
  • the synchronous operation with the sprocket 8 must be ensured by driving the swivel gripper shaft 29 accordingly.
  • a sheet to be processed is therefore precisely adjusted in the machine shown on the table 24 against the marks 26 and laterally aligned with means not shown. It is then gripped by the swivel grippers 28 of the contact device AL and, as shown in FIG. 3, moved to be taken over by the gripper bar 9 and taken over by the latter.
  • the gripper bar 9 now conveys the sheet over the printing cylinder 1 of the printing unit R, then through the drying unit T and over the printing cylinder of the second printing unit G.
  • the sheet arrives in the discharge device AT, where the chain runs around the deflection wheel 7.
  • the gripper bar opens here so that the sheet can be transferred tangentially to a discharge belt 32.
  • the machine can clearly be equipped with only one printing unit or also with more than two, for example four, printing units, with a drying unit advantageously being connected after each printing unit, particularly in the case of inks that are difficult to dry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)

Claims (7)

  1. Machine de sérigraphie avec au moins un mécanisme de sérigraphie équipé d'un rouleau d'impression (1) tournant devant lequel se déplace tangentiellement en un mouvement de va-et-vient un chariotpochoir (2) dont l'écran (3) peut être pressé par une raclette (5) fixe dans le sens du déplacement contre la surface du rouleau pendant la course d'impression du chariot-pochoir (2), et avec au moins une barre de préhension (9) parallèle au rouleau d'impression (1) et entraînée par des chaînes (6) sur le parcours de la feuille a imprimer (14), cette barre (9) saisissant au niveau d'un margeur (AL) le bord avant de la feuille à imprimer (14) et étant guidée pour introduire en un mouvement synchronisé avec la course d'impression du chariot-pochoir (2) le bord de la feuille (14) entre celui-ci et le rouleau d'impression (1), caractérisée en ce que la barre de préhension (9) est maintenue aux chaînes (6) avec un jeu longitudinal (trous oblongs 16) et est formée de façon à pouvoir, pour un certain parcours dans la zone de la raclette (5), s'engager sans jeu longitudinal dans l'engrenure (21, 20) du rouleau d'impression (1).
  2. Machine de sérigraphie selon la revendication 1 pour feuilles flexibles (14), caractérisée en ce que les chaînes (6) sont disposées de façon à ce que la barre de préhension (9) suive la surface du rouleau d'impression sur un certain angle (5-P) après la raclette (5) et, après s'en être dégagée, soit entraînée sur un parcours de longueur supérieure à celle de la feuille suivante.
  3. Machine de sérigraphie selon l'une des revendications précédentes, caractérisée en ce qu'au niveau du margeur (AL) les chaînes (6) sont entraînées autour de roues à chaînes (8) en rotation synchrone avec le rouleau d'impression (1) et sont munies d'une engrenure (21. 27) dans laquelle la barre de préhension (9) peut s'engager sans jeu longitudinal, le bord avant de la feuille à imprimer étant saisi au niveau d'une butée fixe (26) de la table (24) du margeur par des griffes pivotantes (28) et remis en un mouvement synchrone à la barre de préhension (9).
  4. Machine de sérigraphie selon l'une des revendications précédentes, caractérisée en ce que la barre de préhension (9) est soumise à un déplacement continu dans un sens.
  5. Machine de sérigraphie selon l'une des revendications précédentes, caractérisée en ce que les chaînes (6) entraînent plusieurs barres de préhension (9) à un certain intervalle.
  6. Machine de sérigraphie selon l'une des revendications précédentes, caractérisée en ce que plusieurs mécanismes de sérigraphie (R, G) munis de rouleaux d'impression (1) en pour différentes couleurs rotation synchrone sont disposés l'un à la suite de l'autre, ces groupes étant alimentés en feuilles (14) à partir d'un margeur (AL) par la chaîne (6) commune à tous les rouleaux d'impression.
  7. Machine de sérigraphie selon la revendication 6 caractérisée en ce que tous les rouleaux d'impression (1) sont entraînés en phase.
EP91104972A 1990-04-20 1991-03-28 Machine de sérigraphie Expired - Lifetime EP0452722B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4012573 1990-04-20
DE4012573A DE4012573A1 (de) 1990-04-20 1990-04-20 Siebdruckwerk

Publications (2)

Publication Number Publication Date
EP0452722A1 EP0452722A1 (fr) 1991-10-23
EP0452722B1 true EP0452722B1 (fr) 1995-02-15

Family

ID=6404708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91104972A Expired - Lifetime EP0452722B1 (fr) 1990-04-20 1991-03-28 Machine de sérigraphie

Country Status (2)

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EP (1) EP0452722B1 (fr)
DE (2) DE4012573A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19703312A1 (de) * 1997-01-30 1998-08-06 Rk Siebdrucktechnik Gmbh Verfahren zur Steuerung einer Siebdruckzylindermaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4304399A1 (de) * 1993-02-13 1994-08-18 Rk Siebdrucktechnik Gmbh Verfahren zur Steuerung einer Siebdruckzylindermaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735139A (en) * 1987-09-21 1988-04-05 Precision Screen Machines, Inc. Dual locator system for pallet support plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19703312A1 (de) * 1997-01-30 1998-08-06 Rk Siebdrucktechnik Gmbh Verfahren zur Steuerung einer Siebdruckzylindermaschine

Also Published As

Publication number Publication date
EP0452722A1 (fr) 1991-10-23
DE59104566D1 (de) 1995-03-23
DE4012573A1 (de) 1991-10-24

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