EP0940253A1 - Magnetische Leiste für einen Dauermagnet in einer Siebdruckeinrichtung - Google Patents

Magnetische Leiste für einen Dauermagnet in einer Siebdruckeinrichtung Download PDF

Info

Publication number
EP0940253A1
EP0940253A1 EP99420055A EP99420055A EP0940253A1 EP 0940253 A1 EP0940253 A1 EP 0940253A1 EP 99420055 A EP99420055 A EP 99420055A EP 99420055 A EP99420055 A EP 99420055A EP 0940253 A1 EP0940253 A1 EP 0940253A1
Authority
EP
European Patent Office
Prior art keywords
magnets
permanent magnets
longitudinal
magnetic
cells
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Withdrawn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
EP99420055A
Other languages
English (en)
French (fr)
Inventor
Pierre Doyelle
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.)
Braillon Magnetique SA
Original Assignee
Braillon Magnetique SA
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 Braillon Magnetique SA filed Critical Braillon Magnetique SA
Publication of EP0940253A1 publication Critical patent/EP0940253A1/de
Withdrawn legal-status Critical Current

Links

Images

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 present invention relates to a strip magnetic with permanent magnets, intended for a device continuous screen printing, including a industrial fabric printing device by screen printing.
  • the industrial impression of fabrics derives from the traditional screen printing technique, in which we push the ink or the dye using a squeegee, through a sieve or stencil, some areas of which have been made waterproof with ink.
  • the stencil is consisting of a rotating cylinder, with a diameter of around 200 mm, made of nickel sheet metal pierced with small holes with a diameter of approximately 0.2 mm.
  • the fabric to be printed, supported by a carpet scrolls so continues on a hearth placed under the perforated cylinder, which turns while rolling on the fabric.
  • Printing ink or dye, brought inside the cylinder by a ramp food is traditionally distributed to through cylinder holes by means of a squeegee, placed inside the cylinder and supported on the lower generator of this cylinder.
  • Magnetic generators with permanent magnets obviously don't have this drawback but they must use sufficiently strong magnets. It is around 1985 that new permanent magnets at "rare earths" have been produced industrially. These magnets have a volume energy such that they can advantageously replace the electromagnets with copper or aluminum windings, to create fields sufficiently strong magnetic, usable in particular in strips for screen printing devices rotary as specified above.
  • the system of the aforementioned European patent N ° 0369540 uses, for the variation of the force of attraction magnetic, a longitudinal displacement of a part sliding bearing a series of permanent magnets cylindrical, arranged at constant intervals. This part is mounted and moves under an upper plate of non-magnetically conductive material, provided with circular pads made of magnetically material conductor, arranged in the same pitch as the magnets and forming pole pieces. How the device here requires that the distance between said magnetically conductive pads be greater than diameter of permanent magnets. This condition reduces the flow section of the magnetic flux and, therefore, the efficiency and power of the device.
  • the European patent N ° 0369540 proposes, for the cancellation of the force of attraction, a complementary device consisting of a rotary assembly of all the magnets permanent around a longitudinal axis, allowing this together to describe a 90 ° rotation that keeps the magnets on the top plate.
  • This solution complicates structure, comes at an additional cost, and it increases the size of the magnetic strip. She also complicates the use of this strip, forcing with two separate controls, one for the variation of the force of attraction and the other for the cancellation of this force, by prohibiting a continuous variation between the maximum attraction force and zero force.
  • the longitudinal movement of the workpiece sliding is difficult and causes wear and seizures, because the magnets are strongly attracted by the upper plate, thus causing friction under said plate.
  • European patent application No. 0732199 describes another magnetic strip with permanent magnets, for screen printing machine, which has a succession of permanent magnets mounted on a support mobile.
  • the attraction force is adjustable here by more or less significant distance from all of the magnets, thanks to a "parallelogram" type mounting deformable ".
  • This solution also remains complicated and cumbersome because it requires a certain number joints, as well as the space required for deflection of the deformable parallelogram. In addition, she does not allow total force cancellation of magnetic attraction.
  • the present invention aims to remedy the whole of the disadvantages previously exposed, by providing a magnetic strip with permanent magnets for device screen printing, which allows a variation continues to attract until it is canceled practically total, with a simple and compact solution, while making it easier to move the mobile part.
  • the invention relates to a strip magnetic permanent magnet for device continuous screen printing, including a perforated rotary cylinder inside which is placed a solid roller or scraper tube, made of material magnetic, able to be attracted by the magnetic strip placed under the cylinder, this magnetic strip comprising in a known manner a fixed part with plate upper in non-magnetic material comprising a longitudinal succession of cells filled with parts mild steel fleeces arranged at a constant pitch, and a movable part arranged under the upper plate and movable in longitudinal translation, the mobile part comprising a longitudinal succession of magnets permanent, not equal to that of the pieces polar of the fixed part, the magnets being all vertically magnetized but with magnetization directions alternating, the strip being characterized in that said mobile part includes a grid made of non-magnetic material, comprising a longitudinal succession of cells receiving permanent magnets, the spacing between two cells or consecutive magnets being significantly lower the longitudinal dimension of said cells or magnets, the movable part being slidably mounted in a cavity of the fixed part
  • a magnetic strip with magnets is thus obtained permanent, which can be in particular magnets with "rare earths", belonging to a moving part of relatively thin, which slides freely in a slightly higher cavity, determined by the thickness of the side struts of the fixed part which forms a hollow body.
  • the magnets of the moving part are simultaneously drawn upwards by the pole pieces of the top plate, and towards the bottom by the bottom sole of the fixed part, so that they find themselves in a relatively neutral situation and that their friction, whether under the top plate or on the sole, is particularly weak.
  • the spacing between the permanent magnets of the moving part is clearly smaller than the longitudinal dimension of these magnets, and the same is true for pole pieces, the arrangement corresponds to that of the magnets.
  • the movable part is movable in translation, relative to the fixed part, between a walking position in which the magnets coincide with the pole pieces, and a offset position in which the center of the magnets found in agreement with the middle of the space which separates two pole pieces inserted in the plate upper part of the fixed part.
  • the first position which is the walking position
  • the pole pieces conduct the magnetic flux from the magnets to the solid roller or the scraper tube, which is thus subjected to a vertical attraction force, directed down.
  • the permanent magnets inserted in the grid of the moving part, and the pole pieces inserted in the upper plate of the fixed part have a rectangular or oblong shape, their most large dimension extending in the direction longitudinal of the magnetic strip.
  • This special configuration, with magnets and parts polar with relatively small transverse extension, provides positional stability of the roller or tube forming a scraper, in the direction perpendicular to that of vertical attraction.
  • the spacing of the permanent magnets inserted in the grid of the mobile part, and the spacing corresponding pole pieces inserted in the plate upper part of the fixed part for example equal to about 0.4 times the longitudinal dimension of these magnets and these pole pieces, which is about 0.3 times the pitch of said magnets and pole pieces.
  • the magnetic strip designated as a whole by the mark 1, belongs to a printing device continuous screen printing including a rotating cylinder perforated 2, partially shown in Figure 1, which overcomes the magnetic strip 1 and inside which a full roll 3 of small section is placed, magnetic material.
  • the roller 3, attracted by the magnetic strip 1, rests and rolls on the lower generatrix of the perforated cylinder 2, and there thus pushes ink or dye 6 through the holes of cylinder 2, to distribute it on fabric 4 according to a preset pattern.
  • the force of attraction F exerted by the magnetic strip 1, keeps the roller 3 in its lower position, and allows this roller 3 to exercise continuous pressure on the inside of the cylinder perforated 2 and, consequently, on the fabric 4, said roller 3 thus forming a scraper.
  • the magnetic strip 1 comprises a fixed part, which consists of a flat bottom sole 7, a upper pole plate 8, and two spacers longitudinal 9.
  • the lower sole 7, of rectangular shape elongated, is made of mild steel.
  • the upper pole plate 8 of shape and dimensions corresponding to those of sole 7, is made of non-magnetic material but it has a longitudinal succession of rectangular cells 10, furnished with rectangular pole pieces 11 made of mild steel, whose respective vertical axes are separated from each other of the others by a certain step P, the larger sides of the cells 10 and pole pieces 11 being parallel to the longitudinal direction of the strip 1.
  • the length of the cells 10 and of the corresponding 11 pole pieces is chosen such that the minimum spacing e, separating two cells 10 or two 11 consecutive pole pieces, that is to say clearly of value less than the length L of these cells 10 and parts polar 11.
  • the value of the spacing e is equal to 0.4 times the length L of cells 10 and pole pieces 11.
  • the two longitudinal spacers 9 hold the upper pole plate 8 at the desired distance above of the lower sole 7, by providing a cavity internal 12 of elongated rectangular section.
  • These spacers 9 can be made indifferently by magnetic or not.
  • the assembly constituted by the lower sole 7, by the upper pole plate 8 and by both spacers 9 is assembled by means of screws 13 arranged laterally.
  • a movable grid 14 made of material non-magnetic, comprising a longitudinal succession of cells 15 whose number, pitch P, shape rectangular and the dimensions correspond, respectively, to those of the cells 10 of the plate polar 8.
  • the rectangular cells 15 of the grid 14 are filled with rectangular permanent magnets 16 of corresponding dimensions, all magnetized according to a vertical direction, but with feeding directions alternating, alternating polarities N, S, N, S ... being thus encountered on the upper face of the grid 14, as well as on its underside.
  • Permanent magnets 16 are advantageously magnets of the "earth" type rare ".
  • the thickness of the grid 14 and the magnets permanent 16 is slightly less than the clear height of the cavity 12, so that the grid 14 can slide freely in relation to the fixed part of the magnetic strip 1.
  • the rectangular shape of the magnets 16 and pole pieces 11 not only provides overlap important in the stop position (figure 4), to then cancel the force of attraction of the roller 3, but it also guarantees, in the running position, good stability of the position of the roller 3 forming a scraper in the direction perpendicular to its vertical attraction F (see figure 1 - arrows f indicating the return force of the roller 3).
  • the invention is not limited to the single form of this magnetic strip with magnets permanent for screen printing device which has been described above, by way of example; she in embraces, on the contrary, all variants of realization and application respecting the same principle. It is thus, in particular, that one would not stray from the scope of the invention by modifying the form of magnets and pole pieces, or by choosing a type magnets other than those with "rare earths", or replacing the full roller forming a scraper with a tube magnetic material having the same function.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
EP99420055A 1998-03-02 1999-03-02 Magnetische Leiste für einen Dauermagnet in einer Siebdruckeinrichtung Withdrawn EP0940253A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9802730A FR2775445B1 (fr) 1998-03-02 1998-03-02 Reglette magnetique a aimants permanents pour dispositif d'impression serigraphique
FR9802730 1998-03-02

Publications (1)

Publication Number Publication Date
EP0940253A1 true EP0940253A1 (de) 1999-09-08

Family

ID=9523720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99420055A Withdrawn EP0940253A1 (de) 1998-03-02 1999-03-02 Magnetische Leiste für einen Dauermagnet in einer Siebdruckeinrichtung

Country Status (2)

Country Link
EP (1) EP0940253A1 (de)
FR (1) FR2775445B1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1553987A (de) * 1966-12-29 1969-01-17
EP0369540A1 (de) * 1988-11-14 1990-05-23 Stork Brabant B.V. Magnetbalken für einen Rollrakel in einer Rotationssiebdruckmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1553987A (de) * 1966-12-29 1969-01-17
EP0369540A1 (de) * 1988-11-14 1990-05-23 Stork Brabant B.V. Magnetbalken für einen Rollrakel in einer Rotationssiebdruckmaschine

Also Published As

Publication number Publication date
FR2775445B1 (fr) 2000-04-21
FR2775445A1 (fr) 1999-09-03

Similar Documents

Publication Publication Date Title
EP1119896B1 (de) Rührvorrichtung für flüssigkeiten mit magnetischer kupplung.
CA1067954A (fr) Plateau magnetique a aimants permanents et electro-permanents
CA1211153A (fr) Plateau magnetique a aimants permanents
EP2684451B1 (de) Pendelartige Aufhängevorrichtung einer Sprührampe für landwirtschaftliche Maschinen
EP0940253A1 (de) Magnetische Leiste für einen Dauermagnet in einer Siebdruckeinrichtung
EP0439983B1 (de) Magnetscheider für Nichteisenmetall-Teilchen oder -Stücke
EP0268619B1 (de) Elektromagnetische antriebsvorrichtung
EP3898252A1 (de) Verfahren zum orientieren von magnetfeldempfindlichen teilchen und druckmaschine zur durchführung des verfahrens
BE495993A (de)
WO1986003718A1 (fr) Imprimante matricielle a aiguilles
EP1659676A1 (de) Vibrator für ein tragbares Objekt
EP0783202B1 (de) Beschleuniger für Linearantrieb
BE726847A (fr) Rouleau transporteur pour produits métalliques allongés
FR2589089A3 (fr) Appareil pour le nettoyage des tuiles
BE1023490B1 (fr) Moteur électrique
EP0879498B1 (de) Elektromagnetischer linear stellantrieb mit zwei gegenphasenschwingenden läufern
CH640089A5 (en) Alternating electric current generator and method of manufacturing same
FR2476616A1 (fr) Installation pour l'introduction, une a une, de feuilles de papier dans un dispositif d'entrainement
FR2597948A1 (fr) Dispositif a engrenages pour levage des pilons, par cable autoregle
FR2558042A1 (fr) Appareil a rouler des cigarettes coniques
FR2486438A1 (fr) Appareil de perforation par etincelles d'un materiau en feuille
EP3114759A1 (de) Elektrischer generator mit permanentmagneten und mit einem magnetflusskollektor
BE894586A (fr) Dispositif de suspension magnetique pour un arbre ou un essieu
FR2623323A1 (fr) Dispositif pour la demagnetisation de pieces
FR3157814A1 (fr) Installation de magnétothérapie

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE ES GB IT LI

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20000131

AKX Designation fees paid

Free format text: AT CH DE ES GB IT LI NL

RBV Designated contracting states (corrected)

Designated state(s): AT CH DE ES GB IT LI

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 20010129