EP0806295A1 - Druckluftgesteuerte Rakeleinrichtung für eine Druckstation - Google Patents

Druckluftgesteuerte Rakeleinrichtung für eine Druckstation Download PDF

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Publication number
EP0806295A1
EP0806295A1 EP97201297A EP97201297A EP0806295A1 EP 0806295 A1 EP0806295 A1 EP 0806295A1 EP 97201297 A EP97201297 A EP 97201297A EP 97201297 A EP97201297 A EP 97201297A EP 0806295 A1 EP0806295 A1 EP 0806295A1
Authority
EP
European Patent Office
Prior art keywords
doctor blade
doctor
assembly
blade
bascule
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Withdrawn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
EP97201297A
Other languages
English (en)
French (fr)
Inventor
Giorgio Sacchi
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.)
VIERO Srl
Original Assignee
VIERO Srl
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 VIERO Srl filed Critical VIERO Srl
Publication of EP0806295A1 publication Critical patent/EP0806295A1/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Withdrawn legal-status Critical Current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
    • B41F15/40—Inking units
    • B41F15/42—Inking units comprising squeegees or doctors
    • B41F15/423—Driving means for reciprocating squeegees

Definitions

  • the present invention relates to a printing machine of the type having printing frames and a doctor blade for spreading the color.
  • doctor-blade pressure and inclination with respect to the direction of movement are very important.
  • the same machine must usually be usable also for printing with several doctoring passes in both directions of movement of the doctor blade. It is therefore necessary that the doctor blade be able to slant on command to keep the correct inclination whatever be the direction of movement.
  • the movements are usually realized by means of electric motors and complex electronic control systems. This makes the machine costly and delicate.
  • the general purpose of the present invention is to obviate the above mentioned shortcomings by making available a printing machine having a more economical, simple and reliable structure.
  • a doctor-blade assembly for a surface in printing machines comprising a doctor blade supported at the end by a pair of carriages moving along guides parallel to the doctoring direction on the surface with the carriages comprising means for moving the doctor blade in the direction of approach towards and withdrawal from the surface and means of inclining the doctor blade with respect to the surface and characterized in that the doctor-blade movement and inclination means are compressed air means.
  • Fig. 1 shows schematically a printing station 10.
  • the figure shows only the doctor-blade assembly with the rest of the station (frame holder assembly, doctor blade running color deposit etc) being essentially of the prior art and accordingly readily imaginable to one skilled in the art.
  • the machine comprises a doctor blade 11 supported at the ends by a pair of supports 12 which control the operating pressure of the doctor blade, its height over the doctoring surface 38 and its inclination.
  • each supporting group 12 comprises a double-action compressed air cylinder 13 for vertical lifting of the doctor blade and adjustment of the doctoring pressure and a double-action compressed air cylinder 14 for adjustment of the doctor-blade inclination.
  • the lift and thrust cylinders 13 are fed by a compressed air control assembly 15 while the cylinders 14 are controlled by a valve assembly 16.
  • valve assembly 16 controls supply of the inclination cylinders 14 so that the doctor blade is in one of two specular inclined positions with respect to the normal to the doctoring plane.
  • the compressed air assembly 15 has a first controlling solenoid valve 17 which supplies the lower chamber of the cylinder 13 with a pressure such as to compensate the weight of the doctor blade.
  • This pressure is regulated to a set value by means of a valve 18.
  • a second solenoid valve 19 supplies the upper chamber of the cylinders 13 and thus determines the doctoring thrust.
  • the doctoring pressure is regulated by a valve 20.
  • the doctoring thrust can be adjusted between 0 and 400 N.
  • the pressure balancing circuit must hold constant the counter-pressure value in the lower chamber during the downward movement of the doctor blade because this movement would otherwise cause an increase in the counter-pressure in the lower chamber of the cylinders 13 which could even equal the pressure in the upper chamber.
  • a compressed air sequential valve 21 On the path between the first solenoid valve 17 and the cylinders 13 is arranged a compressed air sequential valve 21 which permits blocking the lower pressure which merely compensates the weight of the doctor blade and let pass the higher pressure to secure raising of the doctor blade in the amount desired.
  • FIGS 2 and 3 show one of the two support assemblies 12 (the other being identical).
  • the assembly comprises a body or carriage 22 running along guides 23 by means of a toothed belt or roller chain 24 to secure the typical forward and backward movement of the doctor blade.
  • the carriage 22 supports a bascule 25 with fulcrum below the carriage at 26.
  • On the bascule are present a pair of guides 27 between which runs a slide 28 which has a U-shaped seat 30 for receiving a supporting end of the doctor blade.
  • a lock lever 31 has a closing tooth 32 for the U-shaped seat to block the doctor blade when it is positioned in the seat.
  • the piston 13 for raising and thrust of the doctor blade acts between the bascule 25 and the slide 28 through a manual regulation 33.
  • the inclination movement of the bascule in the two symmetrical positions with respect to the vertical is obtained by means of the piston 14 provided with a floating casing and double stem fixed to the carriage.
  • the casing of the piston 14 supports a pin connecting it with the bascule for its rotation around the pin 26.
  • a stop slide 35 which moves vertically on the carriage 22 by means of a manual regulation 36.
  • the stop slide has an overturned-V shaped seat 37 in which the pin 34 moves upon operation of the piston 14. Raising or lowering the stop slide limits the travel of the piston 14 to a precise amount to determine the positive or negative angle of inclination of the bascule and hence of the doctor blade with respect to the vertical.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Air Bags (AREA)
EP97201297A 1996-05-06 1997-04-29 Druckluftgesteuerte Rakeleinrichtung für eine Druckstation Withdrawn EP0806295A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI000887A IT1282556B1 (it) 1996-05-06 1996-05-06 Gruppo di raclatura pneumatico per stazioni di stampa
ITMI960887 1996-05-06

Publications (1)

Publication Number Publication Date
EP0806295A1 true EP0806295A1 (de) 1997-11-12

Family

ID=11374201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97201297A Withdrawn EP0806295A1 (de) 1996-05-06 1997-04-29 Druckluftgesteuerte Rakeleinrichtung für eine Druckstation

Country Status (4)

Country Link
EP (1) EP0806295A1 (de)
KR (1) KR970073973A (de)
BR (1) BR9703047A (de)
IT (1) IT1282556B1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1595700A1 (de) * 2004-05-14 2005-11-16 REEFDALE Proprietary Limited Druckarm für eine Siebdruckmaschine
WO2009112841A1 (en) * 2008-03-13 2009-09-17 Dek International Gmbh Print head assembly, screen printing system and method
WO2009138128A1 (en) 2008-05-15 2009-11-19 Airsec S.A.S. Closure cap for a container
WO2012133995A1 (ko) * 2011-03-30 2012-10-04 Kim Young Chul 스크린 날염기용 스퀴지 승강장치
WO2015128929A1 (ja) * 2014-02-25 2015-09-03 富士機械製造株式会社 スクリーン印刷機
CN106079863A (zh) * 2016-08-10 2016-11-09 东莞市凯格精密机械有限公司 一种印刷设备气动装置
CN118927501A (zh) * 2024-07-25 2024-11-12 江苏三鼎亚克力制造有限公司 一种防气泡的pvc片材压延设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH440335A (de) * 1965-07-09 1967-07-31 Zimmer Peter Doppelrakelsteuerung
EP0246209A2 (de) * 1986-04-15 1987-11-19 Svecia Silkscreen Maskiner AB Rakelvorrichtung für Siebdruckmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH440335A (de) * 1965-07-09 1967-07-31 Zimmer Peter Doppelrakelsteuerung
EP0246209A2 (de) * 1986-04-15 1987-11-19 Svecia Silkscreen Maskiner AB Rakelvorrichtung für Siebdruckmaschine

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1595700A1 (de) * 2004-05-14 2005-11-16 REEFDALE Proprietary Limited Druckarm für eine Siebdruckmaschine
US8985014B2 (en) 2008-03-13 2015-03-24 Dtg International Gmbh Print head assembly, screen printing system and method
KR20100136495A (ko) * 2008-03-13 2010-12-28 디티지 인터나치오날 게엠베하 프린트 헤드 조립체, 스크린 인쇄 장치 및 스크린 인쇄 방법
GB2458313B (en) * 2008-03-13 2012-05-23 Dek Int Gmbh Print head assembly, screen printing system and method
WO2009112841A1 (en) * 2008-03-13 2009-09-17 Dek International Gmbh Print head assembly, screen printing system and method
CN102026810B (zh) * 2008-03-13 2015-04-01 Dtg国际有限公司 印刷头组件、丝网印刷系统和方法
EP2993044A3 (de) * 2008-03-13 2016-04-20 ASM Assembly Systems Switzerland GmbH Druckkopfanordnung, siebdrucksystem und verfahren
US9505205B2 (en) 2008-03-13 2016-11-29 Asm Assembly Systems Switzerland Gmbh Print head assembly, screen printing system and method
WO2009138128A1 (en) 2008-05-15 2009-11-19 Airsec S.A.S. Closure cap for a container
WO2012133995A1 (ko) * 2011-03-30 2012-10-04 Kim Young Chul 스크린 날염기용 스퀴지 승강장치
WO2015128929A1 (ja) * 2014-02-25 2015-09-03 富士機械製造株式会社 スクリーン印刷機
JPWO2015128929A1 (ja) * 2014-02-25 2017-03-30 富士機械製造株式会社 スクリーン印刷機
CN106079863A (zh) * 2016-08-10 2016-11-09 东莞市凯格精密机械有限公司 一种印刷设备气动装置
CN118927501A (zh) * 2024-07-25 2024-11-12 江苏三鼎亚克力制造有限公司 一种防气泡的pvc片材压延设备

Also Published As

Publication number Publication date
ITMI960887A1 (it) 1997-11-06
KR970073973A (ko) 1997-12-10
IT1282556B1 (it) 1998-03-27
ITMI960887A0 (de) 1996-05-06
BR9703047A (pt) 1998-11-10

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