EP0642923B1 - Machine à imprimer sérigraphique avec dispositif automatique à succion pour l'enlèvement de l'encre résiduelle - Google Patents

Machine à imprimer sérigraphique avec dispositif automatique à succion pour l'enlèvement de l'encre résiduelle Download PDF

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Publication number
EP0642923B1
EP0642923B1 EP94202586A EP94202586A EP0642923B1 EP 0642923 B1 EP0642923 B1 EP 0642923B1 EP 94202586 A EP94202586 A EP 94202586A EP 94202586 A EP94202586 A EP 94202586A EP 0642923 B1 EP0642923 B1 EP 0642923B1
Authority
EP
European Patent Office
Prior art keywords
screen
suction
printing
screen frame
frame
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
EP94202586A
Other languages
German (de)
English (en)
Other versions
EP0642923A1 (fr
Inventor
Osvaldo Dotti
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.)
Calcar Sa
Original Assignee
Calcar Sa
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Filing date
Publication date
Application filed by Calcar Sa filed Critical Calcar Sa
Publication of EP0642923A1 publication Critical patent/EP0642923A1/fr
Application granted granted Critical
Publication of EP0642923B1 publication Critical patent/EP0642923B1/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
    • B41F15/08—Machines
    • B41F15/0804—Machines for printing sheets
    • B41F15/0813—Machines for printing sheets with flat screens
    • B41F15/0818—Machines for printing sheets with flat screens with a stationary screen and a moving squeegee
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/003—Cleaning arrangements or devices for screen printers or parts thereof
    • B41F35/005—Cleaning arrangements or devices for screen printers or parts thereof for flat screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/30—Recovering used solvents or residues
    • B41P2235/31—Recovering used solvents or residues by filtering

Definitions

  • the object of this invention is a silk-screen printing machine equipped with an automatic suction device for the complete removal of ink residue from the screen frame used in the printing of flat sheets such as sheets of glass, paper, fabric and the like.
  • the so-called silk-screen process uses for the creation of images, lettering, patterns and the like on flat sheets of glass, paper and the like the transfer of inks whether black or coloured, which are spread on a mesh (screen) frame in which such mesh has openings for the passage of the ink arranged in such a way as to match the pattern or image to be printed on the flat sheet, placed in contact with a fixed supporting surface.
  • the current silk-screen printing machines used to print flat media provide a fixed supporting structure with a flat surface on which is placed in a stable manner the medium to be printed and, above the latter, a perforated frame, normally termed the "screen or printing frame".
  • a perforated frame normally termed the "screen or printing frame”.
  • Above such screen frame is positioned a structure capable of being moved, parallel to the plane of the sheet to be printed, from one end of the frame to the opposite end and vice versa.
  • Such structure carries an initial support, in the form of an arm, to the lower end of which is secured a squeegee used to spread the ink on the underlying frame, and a second supporting arm having at its lower end a doctor intended to force the ink, previously spread by the squeegee on the screen, through the latter so as to print the underlying sheet.
  • the supports or arms of the spreading squeegee and of the doctor are capable of being moved in opposition to one another according to a direction perpendicular to the printing plane and in both senses, in order to make possible an initial outward stroke parallel to the printing plane with the squeegee lowered into contact with the screen and the doctor raised, and a second return stroke with the squeegee raised end the doctor lowered, by which means printing is achieved.
  • such type of printing requires that the surface of the screen whose perimeter determines the printing of the edge strip shall be smaller than the surface of the sheet of glass to be printed; in other words the area of the sheet of glass should always be smaller than the area of the screen so as to leave an empty strip between the part to which ink is applied and the corner of the sheet.
  • FR 2 517 254 showing a silk screen machine equipped with a suction device orthogonal to the screen plane.
  • a further disadvantage typical of silk-screen printing machines is constituted by the ready clogging of the screen mesh due to impurities present in the ink and/or deposited on the said screen.
  • a machine for the silk-screen printing of flat sheets of glass or the like comprising a supporting structure (1) capable of moving parallel to the printing plane of a frame and equipped with a spreading squeegee and a printing doctor, both capable of moving in a direction perpendicular to the plane of the frame and independently of one another, comprising a device with automatic action for the removal of ink residue from such screen frame and consisting of at least one suction unit integrally secured to such movable structure and capable of moving in a perpendicular direction with respect to such screen frame simultaneously with such spreading squeegee, the suction nozzle of such unit being connected to a suction header and positioned between such doctor and squeegee, according to the direction of travel thereof, so as to make possible the continuous suction of the ink residue and of any impurities liable to clog the screen during any spreading movement, the stroke of such suction unit being set to a length at least equal to the longitudinal dimension of the frame for the removal of any in
  • such device is also made for such device to be capable of being raised and lowered from/to the frame by means of a rod guided by a slide or the like, operated by pneumatic or like means, such rod and such slide being preferably tilted with respect to the plane vertical to the printing plane.
  • such screen frame is larger in size than the flat sheet to be printed.
  • the machine according to the invention provides for the suction nozzle of such suction unit to have transverse dimensions at least equal to the width of the screen frame.
  • the machine according to the invention comprises a silk-screen printing machine of known type with which is associated a suction device with the aim of being able to print in particular sheets of glass with a perfectly treated edge, without necessitating accurate centring between the impression of the screen and the underlying sheet of glass.
  • such silk-screen printing machine comprises a fixed base plane 1, on which is positioned a sheet of glass 2 to be printed, and a screen 3 capable of being placed in contact with the upper surface of the sheet to be printed, on which is arranged in a known manner an impression to be printed over the whole or part of the surface of the sheet 2.
  • Such machine furthermore comprises a structure 4, located above printing frame 3, which is capable of being moved in two senses parallel to screen frame 3, which structure supports two arms 5 and 6 capable of moving in two senses in a direction perpendicular to the printing plane and independently of one another, via appropriate racks 5a and 6a respectively, operated by appropriate pinions or gearwheels 5b and 6b.
  • a bent squeegee 8 intended to spread the ink on screen 3 after being lowered into contact with the latter and providing, during an initial movement, the outward stroke of structure 4 (arrow A in fig. 1).
  • a shaped component 7 constituting the printing doctor after being lowered into contact with the screen and providing, during a second movement, the return stroke of structure 4 (arrow R in fig. 2).
  • the suction device according to the invention is comprised of a supporting am 11 substantially parallel to the printing plane and made integral, via its end, with such movable structure 4.
  • a pneumatic slide or double-acting piston
  • doctor 7 always remains interposed, in the direction of travel, between suction nozzle 14 and spreading squeegee 8.
  • the device described above is furthermore equipped with means of control with programmed action capable of bringing about its lowering and raising strokes simultaneously with those of spreading squeegee 8 and independently of the means of lowering and/or raising of doctor 7.
  • suction unit 10 is that of removing the ink residue which, after each printing stroke, remains on the mesh of frame 3 exceeding the surface of underlying sheet 2 to be printed, as well as the impurities or the like present on the frame, the presence of such filter within suction duct 15 makes possible the continuous retention thereof avoiding discharge to the atmosphere.
  • the suction unit/squeegee assembly is than made to move over the screen frame to enable suction nozzle 14 to clean the surface of the screen while squeegee 8 spreads the ink.
  • the movement is stopped after squeegee 8 has overshot end 2a of shoot 2 so as to overshot with certainty the peripheral edge of the sheet to be printed.
  • suction unit 10-14 and squeegee 8 are raised and printing doctor 7 is lowered onto the screen and made to move over the latter in the opposite direction to that of movement of squeegee 8 (fig. 2).
  • suction device combined with such spreading squeegee makes it possible in practice to spread the ink beyond the periphery of the sheet and thus reliably print the peripheral edge thereof.
  • the possibility of extending the ink beyond the effective dimensions of the sheet provides the advantage of obtaining perfect printing of the edge thereof even if the sheet is not perfectly centred on the impression to be printed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Manufacturing Of Printed Wiring (AREA)

Claims (3)

  1. Une machine d'impression sérigraphique pour feuille de verre plane (2) comprenant une structure de support (1) capable de se déplacer parallèlement au plan d'impression d'un cadre d'écran (3) et équipée d'une raclette d'étalement (8) et d'une racle d'impression (7), raccordées à une structure mobile (4) à la fois capable de se déplacer dans une direction perpendiculaire au plan du cadre d'écran (3) et indépendamment l'une de l'autre, dans laquelle ce cadre d'écran (3) présente des dimensions plus importantes que celles de la feuille plane (2) à imprimer comprenant un dispositif pour l'élimination automatique des résidus d'encre de ce cadre d'écran (3) se composant d'au moins une unité d'aspiration (10) rendue solidaire avec cette structure mobile (4) et capable de se déplacer dans une direction perpendiculaire par rapport à ce cadre d'écran (3) en même temps que cette raclette d'étalement (8), une tuyère d'aspiration (14) de cette unité étant raccordée à un collecteur d'aspiration (15) et placée en aval de cette raclette (8), sur sa direction (A) de course, afin de permettre l'aspiration continue des résidus d'encre et de toutes les impuretés susceptibles de boucher l'écran au cours d'un mouvement d'étalement, la course de cette unité d'aspiration étant déterminée pour couvrir une longueur au moins égale à la dimension longitudinale du cadre (3), caractérisée en ce que ce dispositif comprend un bras (11) parallèle au cadre d'écran (3) dont les extrémités opposées sont respectivement raccordées de manière rigide à la structure mobile (4) et à une pièce coulissante (12) supportant une tige (13) dont la translation vers/depuis l'écran (3) s'opère par des moyens pneumatiques, cette tige (13) et cette pièce coulissante (12) étant inclinées par rapport au plan vertical vers le plan d'impression.
  2. Une machine selon la revendication 1, caractérisée en ce qu'à l'intérieur de ce conduit d'aspiration (15) est prévu un élément de filtrage amovible et/ou remplaçable capable de retenir un éventuel surplus d'encre et d'éventuelles impuretés présents dans l'encre et/ou sur le cadre d'écran (3).
  3. Une machine selon la revendication 1, caractérisée en ce que la tuyère d'aspiration (14) de ce dispositif d'aspiration (10) a une dimension transversale au moins égale à la largeur du cadre d'écran (3).
EP94202586A 1993-09-14 1994-09-08 Machine à imprimer sérigraphique avec dispositif automatique à succion pour l'enlèvement de l'encre résiduelle Expired - Lifetime EP0642923B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI931985 1993-09-14
ITMI931985A IT1272629B (it) 1993-09-14 1993-09-14 Macchina per serigrafia con dispositivo automatico aspirante di asportazione di residui di inchiostro

Publications (2)

Publication Number Publication Date
EP0642923A1 EP0642923A1 (fr) 1995-03-15
EP0642923B1 true EP0642923B1 (fr) 1999-05-19

Family

ID=11366901

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94202586A Expired - Lifetime EP0642923B1 (fr) 1993-09-14 1994-09-08 Machine à imprimer sérigraphique avec dispositif automatique à succion pour l'enlèvement de l'encre résiduelle

Country Status (5)

Country Link
EP (1) EP0642923B1 (fr)
AT (1) ATE180212T1 (fr)
DE (1) DE69418552T2 (fr)
ES (1) ES2131154T3 (fr)
IT (1) IT1272629B (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0852856A (ja) * 1994-08-10 1996-02-27 Kengo Hiruta スクリーン印刷装置
JP3272612B2 (ja) * 1996-10-02 2002-04-08 松下電器産業株式会社 印刷用マスク清掃装置及び方法
IT1294648B1 (it) * 1997-09-05 1999-04-12 Ianua Spa Macchina per serigrafia con dispositivo perfezionato di aspirazione di inchiostro in eccesso.
ES2156495B1 (es) * 1998-07-28 2002-03-16 Godino Creacion Y Diseno S L Equipo para el serigrafiado de superficies planas automatizado.
ITUD20090153A1 (it) * 2009-09-03 2011-03-04 Applied Materials Inc Racla per la stampa serigrafica su un substrato o un supporto di stampa
JP6535876B2 (ja) * 2015-04-02 2019-07-03 パナソニックＩｐマネジメント株式会社 スクリーン印刷機
CN106079856A (zh) * 2016-07-15 2016-11-09 上海光和光学制造大丰有限公司 一种印刷机
CN108704813B (zh) * 2018-08-07 2021-07-13 王照云 用于led灯加工的锡膏涂覆装置
JP7454762B2 (ja) * 2019-10-11 2024-03-25 パナソニックＩｐマネジメント株式会社 スクリーン印刷装置およびスクリーン印刷方法
CN110843323B (zh) * 2019-11-27 2023-11-21 海控三鑫(蚌埠)新能源材料有限公司 一种丝印网版堵墨的在线清理装置
CN111942001B (zh) * 2020-08-24 2021-11-16 吉安市惠安建材有限公司 一种丝网印刷机
CN112695347B (zh) * 2020-12-18 2022-08-26 贵阳铝镁设计研究院有限公司 一种铝用气动刮平吸嘴
CN117549663B (zh) * 2024-01-12 2024-03-12 苏州捷卡精密工业制造有限公司 一种气动式大尺寸印刷机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR736897A (fr) * 1931-05-14 1932-11-30 Système permettant de maintenir propres les gabarits et, le cas échéant, de récup'rer la liqueur tinctoriale, dans les machines utilisées pour l'impression, par aspersion de nappes de tissu ou l'équivalent
GB1009740A (en) * 1963-07-19 1965-11-10 Bradford Dyers Ass Ltd Stencil-printing machines
US4433623A (en) * 1981-11-30 1984-02-28 Ppg Industries, Inc. Apparatus for and method of applying a pattern upon a substrate
JPS60184850A (ja) * 1984-02-13 1985-09-20 Toshin Kogyo Kk フラツトスクリ−ン捺染機におけるスクリ−ン型枠の洗浄方法及び洗浄ユニツト
JP2511175B2 (ja) * 1990-05-25 1996-06-26 日立テクノエンジニアリング株式会社 スクリ―ン印刷装置
DE4109707C1 (fr) * 1991-03-23 1992-10-22 Vegla Vereinigte Glaswerke Gmbh, 5100 Aachen, De

Also Published As

Publication number Publication date
IT1272629B (it) 1997-06-26
ATE180212T1 (de) 1999-06-15
DE69418552T2 (de) 1999-09-16
ITMI931985A1 (it) 1995-03-14
ITMI931985A0 (it) 1993-09-14
DE69418552D1 (de) 1999-06-24
ES2131154T3 (es) 1999-07-16
EP0642923A1 (fr) 1995-03-15

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