EP0633135B1 - Magnet table for rotary screen printing machines - Google Patents
Magnet table for rotary screen printing machines Download PDFInfo
- 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
Links
- 238000010022 rotary screen printing Methods 0.000 title claims abstract description 6
- 230000003139 buffering effect Effects 0.000 claims abstract description 10
- 229910001004 magnetic alloy Inorganic materials 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910052790 beryllium Inorganic materials 0.000 claims description 3
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 2
- 238000007639 printing Methods 0.000 description 26
- 230000005291 magnetic effect Effects 0.000 description 11
- 239000004744 fabric Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
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 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)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Coloring (AREA)
Abstract
Description
- The present invention relates to a magnet table for rotary screen printing machines and in particular a table comprising permanent magnets.
- It is known that webs of textiles and other soft materials wound on bobbin are printed by means of rotary screen printing machines. The machines of this kind comprise an horizontal drum which supports the printing screen provided with the pattern to be printed. The printing ink is introduced into the printing drum and is pushed through the printing screen by means of a squeegee roll which freely rotates in contact with the internal cylindrical surface of the printing screen supported by the drum during the rotation thereof. The material to be printed is fed beneath the drum by a flexibile conveyor which moves on a magnet table comprising a rigid transverse girder containing electrical 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. Moreover 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.
- In FR-A-1553987 there is described 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. In 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.
- It is therefore a main object of the present invention to provide a magnet table for rotary screen printing machines, which is free of the above mentioned inconveniences. 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 features and the advantages of the magnet table according to the present invention will appear evident to those skilled in the art from the following detailed description of an embodiment thereof with reference to the attached drawings wherein:
- FIGURE 1 shows a schematic and sectional side view of a magnet table according to the present invention, in operating condition; and
- FIGURE 2 shows a schematic and sectional front view of the same magnet table in operating condition.
- With reference to Fig. 1, 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 byarrow 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 athird girder 12 movable therebetween which bears on its top at least a pair ofpermanent magnets 15 and 15', the upper part ofgirders 11 and 11' being covered by abuffering cover 10. Thegirders - 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 supportingtraverse girders 11 and 11'. Thepermanent magnets 15 and 15' are anchored on the top of thegirder 12 in a known way by thebent plate 12A. The number of themagnets 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. In order to ensure a perfect alignment of the squeegee roll with respect to its axis, 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 thearrows 13 or 14. With the movement according to arrow 13 thegirder 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 thepermanent 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 thefabric 6 to be printed. When the printing operation has to be interrupted, for example when the squeegee roll is to be replaced, thegirder 12 is moved in the direction of thearrow 14 to reach a distance from the squeegee roll 4 so that this is no more attracted by the magnetic field generated bypermanent magnets 15 and 15'. - With reference to Fig. 2,
permanent magnets 15 are anchored on the top of thegirder 12 close to each other in order to uniformly distribute their attractive force along the whole lenght of the squeegee roll 4. Thepermanent magnets 15 are selected among those of high intensity such as the ones made of a Nd-Fe-B alloy. In order to ensure a constant pressure of the squeegee roll along the width of the fabric, 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 thegirder 12 is retracted according toarrow 14 or moving awaymagnet 15 from squeegee roll 4, the printing drum 1 pushes the printing blanket 7 and the interposedfabric 6 into the room left free by the retraction of themagnets 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 thepermanent magnets 15. The metal sheet used for preparing thebuffering cover 10 is preferably very thin in order not to reduce in a significant way the attracting action of the underlyingpermanent magnets 15. However, 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.
Claims (4)
- Magnet table for rotary screen printing machines comprising a pair of spaced apart parallel girders (11, 11') and a third girder (12) placed therebetween which bears on its top at least a pair of permanent magnets (15, 15'), characterized in that said third girder (12) is vertically movable downwards from the upper part of the pair of girders (11, 11') which are covered together with the interposed room by a buffering cover (10) made of a non-magnetic alloy.
- Magnet table according to claim 1, characterized in that the buffering cover (10) is made of a sheet of a copper alloy comprising beryllium, cobalt, nickel and iron.
- Magnet table according to claim 1, characterized in that the buffering cover (10) is made of a sheet of a copper alloy comprising 1.8 to 2% beryllium, more than 0.2% cobalt, 0.02% nickel and 0.04% iron.
- Magnet table according to claim 1 and 2, characterized in that the permanent magnets (15, 15') are of high intensity type made of a Nd-Fe-B alloy.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBG930033 | 1993-07-06 | ||
IT93BG000033A IT1268551B1 (en) | 1993-07-06 | 1993-07-06 | PERMANENT MAGNET COUNTER-MATCHING DEVICE PARTICULARLY FOR ROTARY CYLINDER PRINTING MACHINES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0633135A1 EP0633135A1 (en) | 1995-01-11 |
EP0633135B1 true EP0633135B1 (en) | 1996-10-09 |
Family
ID=11336226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94830338A Expired - Lifetime EP0633135B1 (en) | 1993-07-06 | 1994-07-06 | Magnet table for rotary screen printing machines |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0633135B1 (en) |
JP (1) | JPH0776064A (en) |
AT (1) | ATE143862T1 (en) |
DE (1) | DE69400682T2 (en) |
DK (1) | DK0633135T3 (en) |
IT (1) | IT1268551B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH689547A5 (en) * | 1995-03-14 | 1999-06-15 | Buser Drucktechnik Ag | Screen printing machine. |
DE29517101U1 (en) * | 1995-10-17 | 1997-02-13 | Zimmer, Johannes, Klagenfurt | Magnetic bar |
NL1009394C2 (en) | 1998-06-12 | 1999-12-15 | Stork Brabant Bv | Magnetic bar. |
BRMU8701660U2 (en) * | 2007-09-05 | 2009-10-20 | Paulo Roberto Lourenco | permanent magnet drawback mechanism for general stamping machine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT267458B (en) * | 1966-12-29 | 1968-12-27 | Johannes Zimmer | Magnetic bar |
AT289158B (en) * | 1967-08-28 | 1971-04-13 | Zimmer Peter | Device for treating, in particular for printing sheet-like material |
IT1042390B (en) * | 1974-09-12 | 1980-01-30 | Zimmer J Klagenfurter Maschine | PLANT FOR THE TREATMENT OF MATERIAL TAPES |
NL8802794A (en) * | 1988-11-14 | 1990-06-01 | Stork Brabant Bv | MAGNETIC BAR FOR A ROLLER OF A ROTARY SCREEN PRINTING DEVICE. |
-
1993
- 1993-07-06 IT IT93BG000033A patent/IT1268551B1/en active IP Right Grant
-
1994
- 1994-07-06 AT AT94830338T patent/ATE143862T1/en not_active IP Right Cessation
- 1994-07-06 DK DK94830338.3T patent/DK0633135T3/en active
- 1994-07-06 DE DE69400682T patent/DE69400682T2/en not_active Expired - Fee Related
- 1994-07-06 EP EP94830338A patent/EP0633135B1/en not_active Expired - Lifetime
- 1994-07-06 JP JP6154649A patent/JPH0776064A/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
JPH0776064A (en) | 1995-03-20 |
DK0633135T3 (en) | 1996-11-18 |
ATE143862T1 (en) | 1996-10-15 |
ITBG930033A0 (en) | 1993-07-06 |
EP0633135A1 (en) | 1995-01-11 |
DE69400682T2 (en) | 1997-02-20 |
IT1268551B1 (en) | 1997-03-04 |
ITBG930033A1 (en) | 1995-01-06 |
DE69400682D1 (en) | 1996-11-14 |
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