EP0369540B1 - Barreau magnétique pour racle cylindrique dans une machine à imprimer rotative au pochoir - Google Patents

Barreau magnétique pour racle cylindrique dans une machine à imprimer rotative au pochoir Download PDF

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Publication number
EP0369540B1
EP0369540B1 EP89202871A EP89202871A EP0369540B1 EP 0369540 B1 EP0369540 B1 EP 0369540B1 EP 89202871 A EP89202871 A EP 89202871A EP 89202871 A EP89202871 A EP 89202871A EP 0369540 B1 EP0369540 B1 EP 0369540B1
Authority
EP
European Patent Office
Prior art keywords
magnetic bar
permanent magnets
bottom part
elements
roller squeegee
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
EP89202871A
Other languages
German (de)
English (en)
Other versions
EP0369540A1 (fr
Inventor
Humphry Guido Eduard Beck
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.)
Stork Brabant BV
Original Assignee
Stork Brabant BV
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 Stork Brabant BV filed Critical Stork Brabant BV
Priority to AT89202871T priority Critical patent/ATE103240T1/de
Publication of EP0369540A1 publication Critical patent/EP0369540A1/fr
Application granted granted Critical
Publication of EP0369540B1 publication Critical patent/EP0369540B1/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
    • B41F15/14—Details
    • B41F15/40—Inking units
    • B41F15/42—Inking units comprising squeegees or doctors
    • B41F15/426—Inking units comprising squeegees or doctors the squeegees or doctors being magnetically attracted

Definitions

  • the invention relates to a magnetic bar according to the preamble of claim 1.
  • the bottom part is according to the invention displaceable in the vertical direction from the top part.
  • the bottom part of the magnetic bar can carry out a rotation through 90° about a longitudinal axis thereof.
  • GB-A-450 541 describes a magnetic device for holding articles wherein, for releasing said articles, the magnet or magnets can be rotated away from the pole shoes. Also this publication does not envisage or suggest a use in an application in which reduction of the magnetic force of attraction to an intermediate value as desired.
  • the magnetic bar 1 comprises a top part 2 and a bottom part 3, the top surface of the top part 2 being provided with a teflon layer 4.
  • a printing blanket 5 of the rotary screen printing device bearing a cloth 6 to be printed glides over this teflon layer, a cylindrical stencil 7 containing a roller squeegee 8 rolling over said cloth 6.
  • the bottom part 3 of the magnetic bar is provided with a number of cylindrical rods 9 which are disposed next to each other with a space between them in the lengthwise direction of the bar, and which each comprise a bottom part 10 fixed to the part 3 of the magnetic bar, a permanent magnet 11, and a top part 12.
  • the permanent magnets 11 are placed in such a way that the polarity of the permanent magnets of the adjacent rods 9 are always alternated. In other words, there is alternately a north pole and a south pole at the top side.
  • the permanent magnets can be of the cobalt/samarium type, or of the neodymium/iron/boron type, which are the currently strongest available types of permanent magnets.
  • the parts 10 and 12 of each of the cylindrical bars are, like the bottom part 3 of the magnetic bar, preferably made of iron.
  • the top part 2 of the magnetic bar is plate-shaped and made of a non-magnetically conducting material such as, for example, aluminium.
  • Disc-shaped elements 13, made of a magnetically conducting material such as, for example, iron are disposed herein at regular intervals from each other.
  • the elements 13 are circular, with a diameter which corresponds to that of the cylindrical rods 9, and are placed in such a way relative to each other that each element can always be in line with a corresponding rod 9 of the bottom part 3 of the magnetic bar.
  • the top surfaces of the elements 13 are flush with the top surface of the plate 2, while the elements 13 at the bottom side of the plate 2 project slightly beyond it, the bottom surfaces of the elements 13 thus being in contact with the top surfaces of the corresponding bars 9 of the bottom part 3 of the magnetic bar.
  • the bottom part 3 bearing the permanent magnets can be moved away from the top part in the direction of the double arrow F in Fig. 2, following which said bottom part can be tilted through 90° about a longitudinal axis. If this tilting of the bottom part is carried out without moving this part away from the top part first, the roller squeegee will have a tendency, due to a residual field possibly present, to move sideways at the beginning of the tilting, which can cause damage to the stencil. In general, it is sufficient to move the bottom part approximately 20 mm away from the top part.
  • This design of the magnetic bar has the advantage that permanent magnets can now be used while retaining the possibility of exerting a variable force of attraction on the roller squeegee. Through the absence of the coils, a considerable weight saving is obtained, on the one hand, while on the other, no heat is developed in the magnetic bar, something which gives rise to problems such as the buckling of the bar.
  • the bottom part of the magnetic bar moves in the lengthwise direction. It is, however, also conceivable for the bottom part to move at right angles to the lengthwise direction of the magnetic bar. In this case the permanent magnets could be placed more closely together.

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

Claims (5)

  1. Barreau magnétique (1) pour un racle à rouleau (8) d'un dispositif rotatif d'impression au pochoir par sérigraphie, ledit barreau portant un certain nombre d'aimants permanents (11) disposés les uns à côté des autres dans la direction longitudinale, afin d'attirer la racle à rouleau (8), caractérisé en ce que
    - ledit barreau magnétique (1), afin de faire varier la force magnétique d'attraction s'exerçant sur le racle à rouleau (8) comprend deux parties qui peuvent être déplacées l'une par rapport à l'autre, à savoir une partie supérieure fixe (2) et une partie inférieure (3) qui est susceptible de glisser dans la direction longitudinale par rapport à la partie supérieure (2);
    - les aimants permanents (11) sont disposés dans la partie inférieure (3);
    - la partie supérieure (2) est une plaque en matériau non-magnétiquement conducteur muni localement d'éléments (13) en matériau magnétiquement conducteur s'étendant au moins sur toute l'épaisseur de la plaque, tandis que la positions des éléments (13) l'un par rapport à l'autre dans ladite plaque correspond à la position relative des aimants permanents (11) dans la partie inférieure du barreau magnétique (1), de telle sorte que les aimants permanents (11) puissent être disposés ensemble en relation de conduction avec des éléments appropriés de la partie supérieure (2); et
    - la distance entre les éléments (13) de la partie supérieure du barreau magnétique (1) est supérieure au diamètre des aimants permanents (11) de la partie inférieure (3).
  2. Barreau magnétique selon la revendication 1, caractérisé en la partie inférieure (3) est susceptible d'être déplacée dans la direction verticale en s'éloignant de la partie supérieure (2).
  3. Barreau magnétique selon la revendication 1 ou 2, caractérisé en ce que la partie inférieure (3) est susceptible de subir une rotation de 90° le long de l'un de ses axes longitudinaux.
  4. Barreau magnétique selon les revendications précédentes, caractérisé en ce que les aimants permanents (11) présentent une structure de barreaux verticaux (9) en matériau magnétiquement conducteur.
  5. Barreau magnétique selon les revendications précédentes, caractérisé en ce que les éléments en matériau magnétiquement conducteur sont légèrement en saillie en-dessous de la face inférieure de la plaque.
EP89202871A 1988-11-14 1989-11-10 Barreau magnétique pour racle cylindrique dans une machine à imprimer rotative au pochoir Expired - Lifetime EP0369540B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89202871T ATE103240T1 (de) 1988-11-14 1989-11-10 Magnetbalken fuer einen rollrakel in einer rotationssiebdruckmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8802794A NL8802794A (nl) 1988-11-14 1988-11-14 Magneetbalk voor een rolrakel van een rotatiezeefdrukinrichting.
NL8802794 1988-11-14

Publications (2)

Publication Number Publication Date
EP0369540A1 EP0369540A1 (fr) 1990-05-23
EP0369540B1 true EP0369540B1 (fr) 1994-03-23

Family

ID=19853217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89202871A Expired - Lifetime EP0369540B1 (fr) 1988-11-14 1989-11-10 Barreau magnétique pour racle cylindrique dans une machine à imprimer rotative au pochoir

Country Status (4)

Country Link
EP (1) EP0369540B1 (fr)
AT (1) ATE103240T1 (fr)
DE (1) DE68914098T2 (fr)
NL (1) NL8802794A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6227108B1 (en) 1998-06-12 2001-05-08 Stork Brabank B.V. Magnet bar
CN107244139A (zh) * 2017-06-21 2017-10-13 福建浔兴拉链科技股份有限公司 一种全自动拉片丝印设备及其使用方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1268551B1 (it) * 1993-07-06 1997-03-04 Sgm Spa Dispositivo di contro-partita a magneti permanenti di raclatura particolarmente per macchine da stampa a cilindri rotanti
CH689547A5 (de) * 1995-03-14 1999-06-15 Buser Drucktechnik Ag Siebdruckanlage.
NL1004199C2 (nl) * 1996-10-04 1998-04-07 Stork Brabant Bv Magneetbalk voor een rolrakel van een rotatiezeefdrukmachine.
FR2775445B1 (fr) * 1998-03-02 2000-04-21 Braillon Magnetique Sa Reglette magnetique a aimants permanents pour dispositif d'impression serigraphique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB429199A (en) * 1933-12-12 1935-05-27 Neill James & Co Sheffield Ltd Improvements in magnetic work holders
GB450541A (en) * 1935-01-15 1936-07-15 Frederick William Windley Improvements in magnetic chucks, magnetic-separators and magnetic clutches

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL71981C (fr) * 1900-01-01
CH426711A (de) * 1965-07-16 1966-12-31 Aston Martin Co Siebdruckmaschine mit Rundschablone

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB429199A (en) * 1933-12-12 1935-05-27 Neill James & Co Sheffield Ltd Improvements in magnetic work holders
GB450541A (en) * 1935-01-15 1936-07-15 Frederick William Windley Improvements in magnetic chucks, magnetic-separators and magnetic clutches

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Kunststoff-Lexikon, Carl Hanser Verlag München Wien 1981, page 399, "Polytetrafluorethylen" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6227108B1 (en) 1998-06-12 2001-05-08 Stork Brabank B.V. Magnet bar
CN107244139A (zh) * 2017-06-21 2017-10-13 福建浔兴拉链科技股份有限公司 一种全自动拉片丝印设备及其使用方法

Also Published As

Publication number Publication date
DE68914098D1 (de) 1994-04-28
DE68914098T2 (de) 1994-08-04
ATE103240T1 (de) 1994-04-15
EP0369540A1 (fr) 1990-05-23
NL8802794A (nl) 1990-06-01

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