EP0960731A1 - Spannvorrichtung für Siebdruckschablonen - Google Patents

Spannvorrichtung für Siebdruckschablonen Download PDF

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Publication number
EP0960731A1
EP0960731A1 EP98830328A EP98830328A EP0960731A1 EP 0960731 A1 EP0960731 A1 EP 0960731A1 EP 98830328 A EP98830328 A EP 98830328A EP 98830328 A EP98830328 A EP 98830328A EP 0960731 A1 EP0960731 A1 EP 0960731A1
Authority
EP
European Patent Office
Prior art keywords
frame
mobile
section
screen material
expansion chamber
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Withdrawn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
EP98830328A
Other languages
English (en)
French (fr)
Inventor
Sergio Tosi
Gianfranco Magnani
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.)
Serimec di Magnani Gianfranco e C SNC
Original Assignee
Serimec di Magnani Gianfranco e C SNC
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 Serimec di Magnani Gianfranco e C SNC filed Critical Serimec di Magnani Gianfranco e C SNC
Priority to EP98830328A priority Critical patent/EP0960731A1/de
Publication of EP0960731A1 publication Critical patent/EP0960731A1/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Withdrawn legal-status Critical Current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
    • B41F15/34—Screens, Frames; Holders therefor
    • B41F15/36—Screens, Frames; Holders therefor flat

Definitions

  • the invention is useful in the manufacturing of flat silk screens which are essentially constituted by a flat framework on which the sieve or screen is stretched.
  • a frame is fixed to it, normally by use of glue.
  • a drawback which is a direct consequence of the tensioning operation consists in the differentiated deformation the frame is subject to when, after having been fixed to the stretched material, the material is detached from the gripping organs it was stretched in.
  • a further typical drawback of the prior art consists in the impossibility in practice of readjusting and/or keeping a silk screen at the predetermined tension.
  • Mechanically-adjustable self-tensioning frames need no such unwieldy external tensioning apparatus but are structured in such a way that the material can be fixed to the frame itself (to a sort of counterframe) and brought up to the desired tension through successive mechanical adjustments actuated by means of screw devices.
  • the main aim of the present invention is to create an apparatus which is not external, but rather stably associated to the frame of the screen, and which obviates the above-mentioned drawbacks and limitations inherent in the prior art.
  • An advantage of the invention consists in the possibility of regulating the tension of the screen material constantly and uniformly at least in the two main directions, longitudinal and transversal, independently of the deformability and the real deformations of the frame.
  • a further advantage of the invention consists in the simplicity and the basic ease with which the tension of the screen material can be adjusted.
  • a still further advantage of the invention is that the whole tensioning operation is made extremely rapid.
  • 1 denotes in its entirety a flat silk screen constituted by a flat silk screen frame constituted by a flat frame 10 in a form somewhat like a picture frame, on which the screen material or sieve 2 is fixed.
  • the frame 10 is a structure, normally made of metal, constituted by sections 3 or 3' which are straight and connected at the ends thereof consecutively, with the interpositioning of connection portions.
  • the sections 3 and 3' are predisposed so that at least one expansion chamber 4 is located on at least a part of the external border of the frame 10.
  • the chamber 4 is formed by a tubular element 5 predisposed longitudinally on the external border of the frame 10 in a special longitudinal grooved seating 11.
  • the tubular element 5 is elastically deformable 5 and suitable for sealedly and internally receiving a pressurised fluid.
  • the fluid which can be, according to needs, gassy (air) or liquid, has the task of causing the expansion of the tubular element 5 so that the external-facing mobile portions of the element surface (with respect to the frame) are caused to displace externalwise of the frame 10, away from the seatings 11 of the sections 3.
  • Means for fixing the screen material 2 are located at the lower side of the sections 3, opposite to the upper side where the material 2 is stretched.
  • the means for fixing comprise a groove 12 into which the screen material is introduced and fixed by means of a small rod 13 insertable and press-jointable in the groove 12 itself.
  • the above-described process can advantageously be operated on all the frame 10 sides, operating only by means of a fluid-actuated system.
  • the mobile surfaces are constituted by outward-facing surfaces of at least one relatively-rigid mobile element 6 coupled on the single sections 3 forming the frame 10 and slidable in at least one direction which is parallel to the frame 10 plane.
  • the exapansion of the chamber 4, constituted in the example by the tubular element 5 pushes the mobile element 6 externalwise.
  • a third embodiment illustrated in figure 5, the configuration is similar to that of the second embodiment, but the mobile element 6 is substituted by a differently-conformed mobile element 6' constituted by a section exhibiting a C-shaped transversal section, coupled slidably on the parallel and opposite surfaces of the section 3.
  • FIG. 6 A variant of the embodiment of figure 5 is shown in figure 6, where instead of the mobile element 6' there is a mobile element 14 constituted by a closed section slidably internally housing the section 3.
  • the screen material 2 must be fixed on the mobile element 14 which for the purpose is specially provided with a longitudinal cavity 15 for anchoring the material 2 similarly to the previously-described embodiments.
  • the mobile surfaces localised at the external edge of the frame 10 and predisposed to interact with the corresponding facing portions of material 2, are constituted by the external surfaces of at least one rigid mobile element 9 which is hinged longitudinally to a section 3' - constituting the structure of the frame 10 - by means of a pin 16.
  • the chamber 4, once more constituted by a tubular element 5 produces a rotation of the mobile element 9 about the pin 16 which, by distancing the mobile element 9 from the section 3', tensions the screen material 2.
  • All the illustrated embodiments of the invention enable a rapid, efficient and accurate adjustment of the material.
  • the tensioning is also constant and uniform and dispenses with the need for laborious and unwieldy external machinery.
  • the method for controlling the screen tension is extremely simple, as it is merely necessary to control the fluid pressure inside the expansion chambers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
EP98830328A 1998-05-27 1998-05-27 Spannvorrichtung für Siebdruckschablonen Withdrawn EP0960731A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98830328A EP0960731A1 (de) 1998-05-27 1998-05-27 Spannvorrichtung für Siebdruckschablonen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98830328A EP0960731A1 (de) 1998-05-27 1998-05-27 Spannvorrichtung für Siebdruckschablonen

Publications (1)

Publication Number Publication Date
EP0960731A1 true EP0960731A1 (de) 1999-12-01

Family

ID=8236666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98830328A Withdrawn EP0960731A1 (de) 1998-05-27 1998-05-27 Spannvorrichtung für Siebdruckschablonen

Country Status (1)

Country Link
EP (1) EP0960731A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112410725A (zh) * 2020-11-17 2021-02-26 云谷（固安）科技有限公司 张网方法及张网装置
CN112976779A (zh) * 2021-02-09 2021-06-18 广东捷骏电子科技有限公司 一种丝印可调框架及丝印网框
CN115107348A (zh) * 2022-07-15 2022-09-27 贵州达沃斯光电有限公司 Film膜材印刷网板

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE522794C (de) * 1929-02-21 1931-04-15 August F Battmer Vorrichtung zum Spannen eines an einem Schablonenrahmen befestigten Gewebes fuer Flachschablonendrucker
US2802419A (en) * 1951-12-19 1957-08-13 Ludwig Freiherr Von Holzschuhe Screen printing apparatus
US3541957A (en) * 1967-10-12 1970-11-24 American Screen Process Equip Pneumatic tensioning of stencil screens
DE2920874A1 (de) * 1979-05-23 1980-12-04 Elmar Dr Messerschmitt Spanngeraet zum spannen von siebdruckgeweben auf siebdruckrahmen
US4945387A (en) * 1988-10-04 1990-07-31 Spectrum Sciences B.V. Image transfer apparatus and method using tension transfer member

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE522794C (de) * 1929-02-21 1931-04-15 August F Battmer Vorrichtung zum Spannen eines an einem Schablonenrahmen befestigten Gewebes fuer Flachschablonendrucker
US2802419A (en) * 1951-12-19 1957-08-13 Ludwig Freiherr Von Holzschuhe Screen printing apparatus
US3541957A (en) * 1967-10-12 1970-11-24 American Screen Process Equip Pneumatic tensioning of stencil screens
DE2920874A1 (de) * 1979-05-23 1980-12-04 Elmar Dr Messerschmitt Spanngeraet zum spannen von siebdruckgeweben auf siebdruckrahmen
US4945387A (en) * 1988-10-04 1990-07-31 Spectrum Sciences B.V. Image transfer apparatus and method using tension transfer member

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112410725A (zh) * 2020-11-17 2021-02-26 云谷（固安）科技有限公司 张网方法及张网装置
CN112410725B (zh) * 2020-11-17 2023-08-04 云谷（固安）科技有限公司 张网方法及张网装置
CN112976779A (zh) * 2021-02-09 2021-06-18 广东捷骏电子科技有限公司 一种丝印可调框架及丝印网框
CN112976779B (zh) * 2021-02-09 2022-02-15 广东捷骏电子科技有限公司 一种丝印可调框架及丝印网框
CN115107348A (zh) * 2022-07-15 2022-09-27 贵州达沃斯光电有限公司 Film膜材印刷网板

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