EP0633135B1 - Table magnétique pour machines de sérigraphie rotatives - Google Patents

Table magnétique pour machines de sérigraphie rotatives Download PDF

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Publication number
EP0633135B1
EP0633135B1 EP94830338A EP94830338A EP0633135B1 EP 0633135 B1 EP0633135 B1 EP 0633135B1 EP 94830338 A EP94830338 A EP 94830338A EP 94830338 A EP94830338 A EP 94830338A EP 0633135 B1 EP0633135 B1 EP 0633135B1
Authority
EP
European Patent Office
Prior art keywords
magnet table
pair
permanent magnets
girder
printing
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
EP94830338A
Other languages
German (de)
English (en)
Other versions
EP0633135A1 (fr
Inventor
Danilo Molteni
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.)
SGM SpA
Original Assignee
SGM SpA
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 SGM SpA filed Critical SGM SpA
Publication of EP0633135A1 publication Critical patent/EP0633135A1/fr
Application granted granted Critical
Publication of EP0633135B1 publication Critical patent/EP0633135B1/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 present invention relates to a magnet table for rotary screen printing machines and in particular a table comprising permanent magnets.
  • the squeegee roll made of ferromagnetic metal, is downwardly attracted by the magnet table so that the magnetic attraction causes the squeegee roll to "squeeze" the printing ink through the perforations of the printing screen, with the final result that the printing ink penetrates into the web of the material which is correspondingly printed.
  • the use of an electromagnet in the magnet table for attracting the squeegee roll has the advantage that the attraction can be easily interrupted by simply interrupting the electric power. This operation is quite frequent since it is required any time the squeegee roll is to be replaced or the printing screen to be changed.
  • the use of the electromagnets has however the drawback that the attraction forces are not enough strong to cause the squeegee roll to energically push the ink to penetrate into fabrics of high thickness. In such cases it is possible to increase the forces by using more powerful electromagnets of bigger sizes, but this solution involves room problems.
  • the electromagnets require a considerable consumption of electric power and are subject to thermal expansion during the operation with consequent negative influence on the printing accuracy.
  • a magnetic table wherein a girder bearing a set of permanent magnets can be moved parallel to the axis of the squeegee roll in order to modify the magnetic field generated by the magnets.
  • the cover of the magnetic table consists of a plate made of a non-magnetic alloy wherein there is inserted a plurality of discs made of magnetizable material. These discs allow to shunt the poles of the permanent magnets and therefore interrupt their attraction force outside the table. Because of the discontinous structure of its cover, this table has the drawback that the attraction force is not homogeneous along its length and cannot reach very high values.
  • FR-A-2284448 there is described a magnetic table whose cover is thin and monolithic. However, in this magnetic table the magnets are not movable, so that the attraction force cannot be quickly interrupted.
  • the said object is achieved with a magnet table comprising a pair of spaced apart parallel girders and a third girder placed therebetween which bears on its top at least a pair of permanent magnets, characterized in that said third girder is vertically movable downwards from the upper part of the pair of girders which are covered together with the interposed room by a buffering cover made of a non-magnetic alloy.
  • the printing drum 1 rotates in the direction indicated by arrow 2 while printing ink 3 is introduced inside the printing drum and collects on the internal surface of the printing screen 1 in contact with the squeegee roll 4 which is caused to rotate in the direction of the arrow 5 by the rotation of the printing drum 1.
  • the fabric 6, or other similar material to be printed, is fed by the printing blanket 7 which acts as a conveyor and moves in the direction indicated by arrow 8.
  • the arrangement heretofore described is exactly as in the prior art.
  • the novel part in Fig. 1 is the magnet table according to the present invention which will be now described in greater detail.
  • the table comprises a pair of parallel transverse girders 11 and 11' and a third girder 12 movable therebetween which bears on its top at least a pair of permanent magnets 15 and 15', the upper part of girders 11 and 11' being covered by a buffering cover 10.
  • the girders 11, 11' and 12 are made of the same material used for the girders of the tables of the prior art, but their thickness is obviously about one third.
  • the buffering cover 10 consists of a thin sheet of a non-magnetic alloy properly bent as a box in order to cover the upper part of supporting traverse girders 11 and 11'.
  • the permanent magnets 15 and 15' are anchored on the top of the girder 12 in a known way by the bent plate 12A.
  • the number of the magnets 15, 15' depends on their lengths and the length of the squeegee roll 4.
  • the total length of the magnets must at least correspond to the length of the squeegee roll.
  • the magnets and their supports have preferably a width in the range of 16-25 mm.
  • the girder 12 is driven by known means (not shown) and can vertically move as indicated by the arrows 13 or 14. With the movement according to arrow 13 the girder 12 brings the permanent magnets in a position very close to the squeegee roll 4 which is in this way attracted by the magnetic field generated by the permanent magnets 15 and 15'. When attracted by the magnetic field the squeegee roll 4 "squeezes" the printing ink through the perforations of the printing screen 1 supported by the printing drum 1 and causes it to penetrate into the fabric 6 to be printed.
  • the girder 12 is moved in the direction of the arrow 14 to reach a distance from the squeegee roll 4 so that this is no more attracted by the magnetic field generated by permanent magnets 15 and 15'.
  • permanent magnets 15 are anchored on the top of the girder 12 close to each other in order to uniformly distribute their attractive force along the whole lenght of the squeegee roll 4.
  • the permanent magnets 15 are selected among those of high intensity such as the ones made of a Nd-Fe-B alloy.
  • the distance between the magnets is preferably in the range of 30-40 mm according to the diameter of the squeegee roll and consequently to its stiffness.
  • An important feature of the device according to the present invention is the buffering cover 10. This cover prevents that, when the girder 12 is retracted according to arrow 14 or moving away magnet 15 from squeegee roll 4, the printing drum 1 pushes the printing blanket 7 and the interposed fabric 6 into the room left free by the retraction of the magnets 15. This downwardly movement of printing drum 1, fabric 6 and printing blanket 7 would be detrimental to the functionality of the machine and to the quality of the printing results.
  • the buffering cover 10 is properly made of a non-magnetic alloy so that it will not be attracted by the magnetic field generated by the permanent magnets 15.
  • the metal sheet used for preparing the buffering cover 10 is preferably very thin in order not to reduce in a significant way the attracting action of the underlying permanent magnets 15.
  • the thickness of the said metal sheet must be properly selected in order to prevent that it might be deflected by the weight of the printing drum 1 and squeegee roll 4. All these requirements are met for example by a 0.3 mm thick metal plate of a special copper alloy comprising 1.8 to 2% beryllium, more than 0.2% cobalt, about 0.02% nickel and about 0.04% iron.
  • the magnet table according to the present invention has a very simple and compact structure which allows to generate a magnetic field stronger than the ones generated by electromagnets having the same dimensions.
  • the squeegee roll 4 is attracted in a very uniform way along its lenght so that it does not vibrate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Rotary Presses (AREA)
  • Coloring (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (4)

  1. Table magnétique pour machines de sérigraphie rotatives comprenant une paire de poutres parallèles écartées l'une de l'autre (11-11') et une troisième poutre (12) placée entre elles qui porte à sa partie supérieure au moins une paire d'aimants permanents (15-15'), caractérisée en ce que la troisième poutre (12) est mobile verticalement vers le bas depuis la partie supérieure de la paire de poutres (11-11') qui sont recouvertes ainsi que l'espace interposé par un couvercle amortisseur (10) en un alliage non-magnétique.
  2. Table magnétique selon la revendication 1, caractérisée en ce que le couvercle amortisseur (10) est constitué par une tôle en un alliage de cuivre comprenant du beryllium, du cobalt, du nickel et du fer.
  3. Table magnétique selon la revendication 1, caractérisée en ce que le couvercle amortisseur (10) est constitué par une tôle en un alliage de cuivre comprenant de 1,8 à 2% de beryllium, plus de 0,2% de cobalt, 0,02% de nickel et 0,04% de fer.
  4. Table magnétique selon la revendication 1 et 2, caractérisée en ce que les aimants permanents (15-15') sont de type à haute intensité réalisés en un alliage Nd-Fe-B.
EP94830338A 1993-07-06 1994-07-06 Table magnétique pour machines de sérigraphie rotatives Expired - Lifetime EP0633135B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT93BG000033A IT1268551B1 (it) 1993-07-06 1993-07-06 Dispositivo di contro-partita a magneti permanenti di raclatura particolarmente per macchine da stampa a cilindri rotanti
ITBG930033 1993-07-06

Publications (2)

Publication Number Publication Date
EP0633135A1 EP0633135A1 (fr) 1995-01-11
EP0633135B1 true EP0633135B1 (fr) 1996-10-09

Family

ID=11336226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94830338A Expired - Lifetime EP0633135B1 (fr) 1993-07-06 1994-07-06 Table magnétique pour machines de sérigraphie rotatives

Country Status (6)

Country Link
EP (1) EP0633135B1 (fr)
JP (1) JPH0776064A (fr)
AT (1) ATE143862T1 (fr)
DE (1) DE69400682T2 (fr)
DK (1) DK0633135T3 (fr)
IT (1) IT1268551B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH689547A5 (de) * 1995-03-14 1999-06-15 Buser Drucktechnik Ag Siebdruckanlage.
DE29517101U1 (de) * 1995-10-17 1997-02-13 Zimmer, Johannes, Klagenfurt Magnetbalken
NL1009394C2 (nl) 1998-06-12 1999-12-15 Stork Brabant Bv Magneetbalk.
BRMU8701660U2 (pt) * 2007-09-05 2009-10-20 Paulo Roberto Lourenco mecanismo levadiço com imã permanente para máquina de estamparia em geral

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT267458B (de) * 1966-12-29 1968-12-27 Johannes Zimmer Magnetbalken
AT289158B (de) * 1967-08-28 1971-04-13 Zimmer Peter Einrichtung zum Behandeln, insbesondere zum Bedrucken von flächenförmigem Material
IT1042390B (it) * 1974-09-12 1980-01-30 Zimmer J Klagenfurter Maschine Impianto per il trattamento di nastri di materiale
NL8802794A (nl) * 1988-11-14 1990-06-01 Stork Brabant Bv Magneetbalk voor een rolrakel van een rotatiezeefdrukinrichting.

Also Published As

Publication number Publication date
IT1268551B1 (it) 1997-03-04
ITBG930033A0 (it) 1993-07-06
DE69400682T2 (de) 1997-02-20
DK0633135T3 (da) 1996-11-18
ATE143862T1 (de) 1996-10-15
DE69400682D1 (de) 1996-11-14
ITBG930033A1 (it) 1995-01-06
EP0633135A1 (fr) 1995-01-11
JPH0776064A (ja) 1995-03-20

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