EP0099587B1 - Racle pour imprimer des objets par sérigraphie - Google Patents

Racle pour imprimer des objets par sérigraphie Download PDF

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Publication number
EP0099587B1
EP0099587B1 EP83107202A EP83107202A EP0099587B1 EP 0099587 B1 EP0099587 B1 EP 0099587B1 EP 83107202 A EP83107202 A EP 83107202A EP 83107202 A EP83107202 A EP 83107202A EP 0099587 B1 EP0099587 B1 EP 0099587B1
Authority
EP
European Patent Office
Prior art keywords
squeegee
rubber
contact pressure
clamping
holding
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
Application number
EP83107202A
Other languages
German (de)
English (en)
Other versions
EP0099587A2 (fr
EP0099587A3 (en
Inventor
Günther Schneider
Artwin Priebisch
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.)
REBHAN, HORST
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
Priority to AT83107202T priority Critical patent/ATE28825T1/de
Publication of EP0099587A2 publication Critical patent/EP0099587A2/fr
Publication of EP0099587A3 publication Critical patent/EP0099587A3/de
Application granted granted Critical
Publication of EP0099587B1 publication Critical patent/EP0099587B1/fr
Expired 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
    • B41F15/44—Squeegees or doctors
    • B41F15/46—Squeegees or doctors with two or more operative parts

Definitions

  • the present invention relates to a squeegee head for printing bodies using the screen printing method, with a squeegee rubber and a holder which detects it.
  • doctor heads whose holder consists of two strips arranged next to one another and running over the entire length of the doctor rubber, between which the doctor rubber is clamped.
  • the elasticity of the rubber material is used in such known squeegee heads. This is done in such a way that the clamping point of the squeegee rubber between the strips is provided at a certain distance from the working edge of the squeegee rubber. The rubber material between the working edge and the clamping point then develops a uniform pressure over the entire length of the working edge due to its elasticity when the working edge is pressed against the screen template.
  • doctor blade heads A disadvantage of such known doctor blade heads is that the elasticity of the doctor blade rubber diminishes after a relatively short period of use, so that the doctor blade rubber dodges and is no longer able to produce the contact pressure required for a satisfactory printing result. This effect, commonly referred to as “flipping", requires frequent replacement of the squeegee rubber, so that the service life of such constructions is relatively short.
  • doctor heads Another disadvantage of such known doctor heads is that they only deliver an error-free printing result with a completely flat printing surface. In contrast, have the body to be printed in the printing area z. B. due to construction unevenness or certain surface areas of the printing surface due to different wall thickness during the printing process different, so there are imperfections in the print image, which lead to a relatively high reject rate.
  • a squeegee head for printing bodies using the screen printing method, with a squeegee rubber and a holder which detects it and which is held under a pressure force is known (DE-OS 2 302 728).
  • the squeegee is supported along its entire length by the holder made of rigid material, which is approximately the same length as the squeegee.
  • the bracket is supported along its length by several springs, through which the pressure force is supplied.
  • a hand-held squeegee for screen printing is also known (DE-OS 1 536 985), in which the squeegee is provided in the form of a plate which is received in a corresponding recess in a rigid holder and in one embodiment by means of one or more springs or by means of magnets Direction is biased out of the bracket recess, so that the squeegee is subjected to a pressing force.
  • the object of the present invention is to provide a completely new doctor head which, with a longer service life and lower consumption of doctor rubber, enables an error-free printing result even with an uneven body surface.
  • a doctor blade head for printing on bodies using the screen printing method, with a doctor blade rubber and a holder which detects it and is held under a pressing force.
  • a squeegee head is characterized in that the holder consists of a number of juxtaposed holder parts, each of which is guided in the squeegee head independently of one another in the pressing direction and each of which is held under an independent pressing force.
  • the features of the invention provide for the first time a doctor head in which, instead of two strips running over the entire length of the doctor rubber, a number of holder parts which are arranged next to one another and can be displaced independently of one another and are held under a pressing force are provided as holders for the doctor rubber. Because of this configuration, the pressure force on the working edge is no longer generated by the doctor rubber material itself, but by means independent of it, so that the magnitude of the pressure force is completely independent of the elasticity of the doctor rubber. The result is a significantly longer service life with the resulting advantages in terms of the consumption of rubber material.
  • doctor blade rubber can be clamped in for a very short time due to the separate means for generating the pressure force, considerably narrower doctor blade rubber strips can also be used without disadvantages for the quality of the printing result. This results in a reduction in doctor blade rubber consumption of over 50%.
  • the holder of the squeegee rubber according to the invention in mutually independent holder parts also has the advantage that unevenness on the body surface no longer plays a significant role for the printing result.
  • the squeegee rubber can better follow any unevenness in the printing process due to the fixing in mutually independent holding parts than in the case of clamping via continuous strips, so that a reject reduction of up to 50% is possible, especially since body surfaces which are designed according to the invention can also be printed on owing to Unevenness previously had to be sorted out before printing.
  • doctor head designed according to the invention to be able to adapt to unevenness better than known doctor heads also leads to improved printing results for bodies with different wall thicknesses over the printing length.
  • the working edge of the squeegee can better follow thin wall areas, which have a greater tendency to dodge compared to thick wall areas, due to the holder according to the invention, so that better printing results can also be achieved in such cases.
  • a particularly important advantage of a doctor blade head according to the invention is that it is also possible without difficulty to print on those surfaces which, viewed over the length of the print image, have different radii.
  • the squeegee rubber can follow a change in radius during the printing process due to the holder in mutually independent holder parts, so that even surfaces can be printed whose radius changes greatly over the length of the printed image.
  • doctor blade rubber is clamped in a particularly flexible manner if the holding parts are not arranged directly next to one another but at a short distance from one another. This distance depends on the Shore hardness and the thickness of the doctor blade rubber material.
  • the displacement of the holder parts in the pressing direction can be limited by adjustable stops.
  • the squeegee can be given a shape adapted to the surface to be printed if necessary.
  • the pressure force for the individual mounting parts can be generated in a variety of ways.
  • small power cylinders can be provided to generate the pressure force.
  • compression springs are provided to generate the pressure force.
  • each holding part consists of a clamping head for the squeegee rubber which is guided in the squeegee head and which is connected to a guide pin on its side opposite the squeegee rubber.
  • the stops can be designed in a wide variety of ways. However, it is expedient if the stops are each formed by a nut with a lock nut, which is arranged on a thread of the guide pin.
  • the guide pins can be connected to the clamping head in a variety of ways. A particularly advantageous embodiment results, however, when the guide pin rests in a bore in the clamping piece and is held by a cross pin.
  • the squeegee rubber can be attached to the mounting parts in a variety of ways. It is expedient if the holding parts have a clamping slot for the squeegee rubber.
  • This clamping slot can be formed in a conventional manner by two clamping jaws which can be screwed together. A particularly simple configuration results, however, if the clamping slot is formed only by a groove, the width of which is slightly smaller than the width of the squeegee rubber. Tests have shown that such a design is completely sufficient to securely fix a squeegee rubber in the holder parts or their clamping head.
  • the clamping slot is inclined at an angle to the pressing direction.
  • the squeegee is tilted so that one of its edges acts as a working edge.
  • the doctor head consists of a flat box-like housing 1, the front surface of which is formed by a removable cover plate 2.
  • a strip 3 which has a number of bores for guide pins 4 arranged next to one another, which have a nut arrangement consisting of a nut 5 and a lock nut 6 at one end and a clamping head 7 at each other end.
  • the clamping heads 7 have an approximately rectangular cross section and are guided so that they can be pushed back and forth in slots in the housing 1 of the doctor head.
  • the clamping heads 7 have clamping slots 8 in the area of their chamfered end face protruding from the housing for receiving a doctor blade rubber 9, which in the present case has an approximately rectangular cross section.
  • the Clamping slots 8 are also inclined at an angle to the pressing direction, which in the present pall runs in a plane through the axes of the guide pins 4.
  • the pins 4 rest in a bore in the clamping heads 7.
  • the guide pins 4 are fastened with the clamping heads 7 by means of a cross pin 10.
  • the clamping heads 7 each consist of two clamping jaws 13 and 14, which are connected to one another by screws 12 and between which the squeegee rubber 9 is clamped.
  • the guide pin 4 is provided at its end opposite the nut 5 with a threaded pin 15 which is screwed into a threaded bore 16 of the clamping head 7.

Landscapes

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

Claims (12)

1. Racle pour impressions sérigraphiques, comportant un organe de raclage en caoutchouc et une monture qui le tient et qui est soumise à une force de poussée, caractérisée par le fait que la monture est constituée par une pluralité de parties (7,4) agencées les unes à côté des autres, guidées dans la racle de manière à pouvoir être déplacées indépendamment les unes des autres suivant la direction de poussée, dans les deux sens opposés, chacune étant soumise à une force de poussée indépendante.
2. Racle selon revendication 1, caractérisée par le fait que les parties de monture (4, 7) sont séparées les unes des autres par de faibles intervalles.
3. Racle selon revendication 1 ou 2, caractérisée par le fait que la plage de mobilité des parties de monture (4, 7) suivant la direction de poussée est limitée par des butées réglables.
4. Racle selon revendication 1, 2 ou 3, caractérisée par le fait que des vérins sont prévus pour produire la force de poussée.
5. Racle selon revendication 1, 2 ou 3, caractérisée par le fait que des ressorts de compression (11) sont prévus pour produire la force de poussée.
6. Racle selon une ou plusieurs des revendications précédentes, caractérisé par le fait que chaque partie de monture est constituée par une tête de serrage pour serrer l'organe de raclage en caoutchouc (9), laquelle est guidée dans la racle et par son côté éloigné de l'organe de raclage en caoutchouc, est assemblée à une broche de guidage (4)
7. Racle selon revendications 3 et 6, caractérisée par le fait que les butées sont constituées chacune par un écrou (5) avec centre- écrou (16) agencés sur un filetage de la broche de guidage (4).
8. Racle selon revendication 4, caractérisée par le fait que la broche de guidage (4) repose dans un trou de la tête de serrage (7) et est maintenue par une goupille transversale (10).
9. Racle selon revendication 1, caractérisée par le fait que les parties de monture (4, 7) présentent une fente de serrage (8) pour l'organe de raclage en caoutchouc (9),
10. Rancle selon revendication 9, caractérisée par le fait que la fente de serrage (8) est formée par deux mâchoires de serrage (13, 14) qui peuvent être assemblées l'une à l'autre par des vis.
11. Racle selon revendication 9, caractérisée par le fait que la fente de serrage (8) est formée par une rainure dont la largeur est légèrement inférieure à l'épaisseur de l'organe de raclage en caoutchouc (9).
12. Racle selon revendication 3, 10 ou 11, caractérisée par le fait que la fente de serrage (8) est inclinée par rapport à la direction de poussée.
EP83107202A 1982-07-23 1983-07-22 Racle pour imprimer des objets par sérigraphie Expired EP0099587B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83107202T ATE28825T1 (de) 1982-07-23 1983-07-22 Rakelkopf zum bedrucken von koerpern im siebdruckverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3227626 1982-07-23
DE19823227626 DE3227626A1 (de) 1982-07-23 1982-07-23 Rakelkopf zum bedrucken von koerpern im siebdruckverfahren

Publications (3)

Publication Number Publication Date
EP0099587A2 EP0099587A2 (fr) 1984-02-01
EP0099587A3 EP0099587A3 (en) 1985-05-15
EP0099587B1 true EP0099587B1 (fr) 1987-08-12

Family

ID=6169195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107202A Expired EP0099587B1 (fr) 1982-07-23 1983-07-22 Racle pour imprimer des objets par sérigraphie

Country Status (3)

Country Link
EP (1) EP0099587B1 (fr)
AT (1) ATE28825T1 (fr)
DE (2) DE3227626A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3812826A1 (de) * 1987-07-03 1989-01-12 Elmar Dr Messerschmitt Rakel fuer den siebdruck
CN102909942A (zh) * 2012-10-05 2013-02-06 梧州市光华纺织制品有限责任公司 刮刀调节装置

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4957045A (en) * 1988-04-16 1990-09-18 Elmar Messerschmitt Doctor for screen printing
US5458060A (en) * 1993-05-03 1995-10-17 Sony Electronics Inc. Screen printing squeegee system
JPH11227157A (ja) * 1998-02-18 1999-08-24 Fuji Mach Mfg Co Ltd クリーム半田印刷機
DE20303187U1 (de) 2003-02-27 2003-04-30 Gst Dekoracni Zarizeni A Strojni Tecnika S.R.O., Hranice Rakelkopf zum Bedrucken von Körpern im Siebdruckverfahren
DE10344023B4 (de) * 2003-09-16 2006-06-14 Thieme Gmbh & Co. Kg Siebdruckrakel und Vorrichtung zum Siebdrucken
FR2935925B1 (fr) 2008-09-16 2010-12-17 Dubuit Mach Support de racle et outil de desserrage de ce support de racle.
DE202011107661U1 (de) 2011-11-07 2013-02-08 Thieme Gmbh & Co. Kg Siebdruckrakel und Vorrichtung zum Siebdrucken
CN107073927A (zh) * 2014-08-01 2017-08-18 康宁股份有限公司 丝网印刷装置和方法
WO2016019274A1 (fr) 2014-08-01 2016-02-04 Corning Incorporated Appareil et procédés de sérigraphie
DE202020102567U1 (de) 2020-05-07 2020-05-19 GST Dekortechnik GmbH Verpackung für eine Rakel für eine Vorrichtung zum Bedrucken von Flächen und Körpern im Siebdruckverfahren

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1819026U (de) * 1960-01-30 1960-10-06 Andreas Peschl Verstellbare und federnde rakel fuer siebdruckmaschinen im rund- und flachdruck.
DE1536985A1 (de) * 1966-10-14 1970-02-26 Knappstein Kg A Rakel fuer Siebdruckgeraete
US3483819A (en) * 1967-05-18 1969-12-16 Precision Systems Co Inc Squeegee assembly for screen process printers of micro-circuits and components thereof
DE2302728A1 (de) * 1973-01-19 1974-07-25 Kesper Hans Ulrich Siebdruckrakeleinrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3812826A1 (de) * 1987-07-03 1989-01-12 Elmar Dr Messerschmitt Rakel fuer den siebdruck
CN102909942A (zh) * 2012-10-05 2013-02-06 梧州市光华纺织制品有限责任公司 刮刀调节装置
CN102909942B (zh) * 2012-10-05 2014-10-22 梧州市光华纺织制品有限责任公司 刮刀调节装置

Also Published As

Publication number Publication date
EP0099587A2 (fr) 1984-02-01
EP0099587A3 (en) 1985-05-15
DE3227626A1 (de) 1984-01-26
DE3372944D1 (en) 1987-09-17
ATE28825T1 (de) 1987-08-15

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