EP0027806A1 - Dispositif racleur - Google Patents

Dispositif racleur

Info

Publication number
EP0027806A1
EP0027806A1 EP80900754A EP80900754A EP0027806A1 EP 0027806 A1 EP0027806 A1 EP 0027806A1 EP 80900754 A EP80900754 A EP 80900754A EP 80900754 A EP80900754 A EP 80900754A EP 0027806 A1 EP0027806 A1 EP 0027806A1
Authority
EP
European Patent Office
Prior art keywords
doctor
box
pressure
pump
displacement pump
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Withdrawn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
EP80900754A
Other languages
German (de)
English (en)
Inventor
Peter Zimmer
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 EP0027806A1 publication Critical patent/EP0027806A1/fr
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the invention relates to a doctor device for applying liquid substances to sheet-like material, in which the liquid application substance emerges from a bottom opening of a doctor box, the liquid pressure required for the exit of the liquid application substance being generated by at least one displacement pump.
  • Squeegee devices of this type are mainly used in stencil printing machines, with flowable ink being pressed out of the slot-shaped bottom opening of the squeegee box through the perforations of a stencil.
  • a doctor device of the type mentioned at the outset is also suitable " for the direct application of a liquid substance to a flat material.
  • the displacement pump is arranged outside the circular stencil, where it is connected to a storage container and from there conveys the dye into the squeegee chamber via one or more supply lines.
  • the liquid pressure is also produced in a known manner (cf. FR-PS 1 116 729) hydrostatically using a high-level storage container, the same difficulties arise and, in addition, there is the difficulty that a rapid pressure change to influence the print quality is not possible.
  • the invention was therefore based on the object of improving a rake device of the type mentioned at the outset in such a way that a rapid pressure change to influence the print quality is possible and that the smallest possible amount of color is lost during a color change.
  • the invention provides that the displacement pump or the displacement pumps are arranged in the doctor box
  • a solution has also already been proposed in which a screw conveyor is located in the paint tube is arranged, which should ensure an equalization of the liquid pressure generated by the outer positive displacement pump over the entire length of the Rakelka mer.
  • the invention achieves the same purpose very simply in that the positive displacement pump or its outlet opening is at least substantially over the Length of the Rakel ⁇ box extends, or that several displacement pumps are distributed over the length of the doctor box or the outlet openings extend over a substantial part of the length of the doctor box. This is particularly easy when, for example, gear pumps are used as displacement pumps.
  • the pressure control of the application substance applied to the outlet gap of the doctor blade box can be carried out according to the invention in that a ' return line for the discharge of pressurized, unnecessary application substance
  • Fig. 2 shows a detail of Fig. 1
  • Fig. 3 shows another embodiment of a doctor device according to the invention in vertical section.
  • a thin-walled squeegee box 3 is arranged in a round stencil 2, which is only indicated, for printing, in particular, florware 1, which is provided with a nozzle-shaped outlet gap 3 'towards the stencil 2.
  • a displacement pump 4 designed as a gear pump is arranged in the interior of the doctor box 3.
  • the doctor blade box 3 is open at the top in the illustrated embodiment.
  • the ink supply takes place via a paint tube 5 with outlet openings 6.
  • the supply quantity is regulated via a known level control 7 in order to keep the ink level in the doctor box 3 constant.
  • the displacement pump 4 which is designed as a gear pump, extends essentially over the length of the doctor box, that is to say over the entire printing width of the doctor device, the toothed rollers 4 '(FIG. 2) being mounted in support bearings 8 at preferably uniform intervals .
  • rings 9 made of slidable material are used in grooves 10 of the toothed rollers 4 "which slide on a slidable surface 11 of the support bearings.
  • the delivery of dye is adjusted by regulating the speed of the gear pump 4.
  • the gear pump 4 can be driven at a somewhat higher speed than the required suction-side pressure.
  • the compensation and the exact pressure setting are then carried out via return lines 12 which are preferably arranged at regular intervals and return the excess ink to the ink supply above the gear pump 4.
  • return lines 12 can e.g. open into a common tube 13, in which an inflatable tube 14 is arranged, with the help of compressed air introduced into the inflatable tube any back pressure can be set to the color flowing back through the return lines.
  • FIG. 3 differs from the embodiment of FIGS. 1 and 2 only in that another displacement pump 4 is arranged in the doctor box 3, namely a radial piston pump.
  • another displacement pump 4 is arranged in the doctor box 3, namely a radial piston pump.
  • the reference numerals entered for FIG. 3 have the meaning explained on the basis of FIGS. 1 and 2.
  • the invention is not restricted to the exemplary embodiments.
  • too several displacement pumps distributed in the longitudinal direction of the doctor box, can be arranged.
  • suitable positive displacement pumps preference will be given to those which - like the gear pump - run slowly. This prevents harmful foaming in the liquid dye.
  • the bottom opening of the squeegee box can have the shape of a continuous outlet gap or can be interrupted or perforated by webs.
  • doctor device according to the invention must not only be used in stencils, in particular circular stencils, but can also be used without a stencil for direct application of liquid application substance to sheet-like material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Coating Apparatus (AREA)

Abstract

Dispositif racleur permettant d'appliquer des substances fluides sur des materiaux (1) ayant une face plane; la substance a appliquer sort par une ouverture (3') faite a la partie inferieure de la caisse (3), la pression necessaire a la sortie de la substance fluide a appliquer etant produite par au moins une pompe rotative a pistons plongeurs (4). Pour faciliter un rapide changement de pression en vue d'influencer la qualite ainsi que pour laisser le moins possible de residus de peinture lors d'un changement de peinture, la pompe (9) ou eventuellement les pompes sont logees dans la caisse (3) du dispositif.
EP80900754A 1979-04-27 1980-11-17 Dispositif racleur Withdrawn EP0027806A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0320679A ATA320679A (de) 1979-04-27 1979-04-27 Spaltrakel
AT3206/79 1979-04-27

Publications (1)

Publication Number Publication Date
EP0027806A1 true EP0027806A1 (fr) 1981-05-06

Family

ID=3546992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80900754A Withdrawn EP0027806A1 (fr) 1979-04-27 1980-11-17 Dispositif racleur

Country Status (7)

Country Link
EP (1) EP0027806A1 (fr)
AT (1) ATA320679A (fr)
BE (1) BE882975A (fr)
DE (1) DE3043384D2 (fr)
ES (1) ES490887A0 (fr)
IT (2) IT8053166V0 (fr)
WO (1) WO1980002399A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3034807C2 (de) * 1980-09-16 1983-12-15 Mathias 4815 Schloss Holte Mitter Vorrichtung zum Auftragen von Medien auf Warenbahnen
DE3200171C2 (de) * 1982-01-07 1984-02-09 Mathias 4815 Schloss Holte Mitter Vorrichtung zum Auftragen eines vorzugsweise mit Farbstoff versehenen Auftragsmediums auf eine flächige Ware
AT376175B (de) * 1982-10-07 1984-10-25 Johannes Zimmer Vorrichtung zum gleichmaessigen auftragen von fliessfaehigen medien
JPS62148267A (ja) * 1985-12-24 1987-07-02 Mitsubishi Electric Corp 印刷装置
JP3345653B2 (ja) * 1993-05-12 2002-11-18 谷電機工業株式会社 スクリーン版クリーニング装置
US5590596A (en) * 1993-05-12 1997-01-07 Tani Electronics Industry, Co., Ltd. Printer system for printing circuit patterns or like on base board

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3036551A (en) * 1959-10-19 1962-05-29 George W Shreckhise Apparatus for coating fabrics
US3071069A (en) * 1961-03-14 1963-01-01 Dry Screen Process Inc Screen printing apparatus
DE2108085C3 (de) * 1970-03-09 1974-08-22 Peter Kufstein Zimmer (Oesterreich) Rakelrolle
DE2134983A1 (de) * 1970-07-22 1972-02-03 Zimmer, Peter, Kufstein, Tirol (Österreich) Rakelvorrichtung
AT350993B (de) * 1973-08-16 1979-06-25 Zimmer Peter Ag Verfahren und vorrichtung zum bedrucken grossflaechiger warenbahnen mit hilfe eines sublimierbaren farbstoffes
NL7414822A (nl) * 1973-11-16 1975-05-21 Zimmer Peter Werkwijze en inrichting voor het bedrukken van vezelmaterialen.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8002399A1 *

Also Published As

Publication number Publication date
ES8102912A1 (es) 1981-02-16
DE3043384D2 (en) 1982-02-11
ATA320679A (de) 1984-05-15
ES490887A0 (es) 1981-02-16
WO1980002399A1 (fr) 1980-11-13
BE882975A (nl) 1980-10-27
IT8053166V0 (it) 1980-04-24
IT8067657A0 (it) 1980-04-24
IT1128774B (it) 1986-06-04

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19810511

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RIN1 Information on inventor provided before grant (corrected)

Inventor name: ZIMMER, PETER