EP0408704B1 - Installation d'application de substances sur une bande de materiau - Google Patents

Installation d'application de substances sur une bande de materiau Download PDF

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Publication number
EP0408704B1
EP0408704B1 EP90901724A EP90901724A EP0408704B1 EP 0408704 B1 EP0408704 B1 EP 0408704B1 EP 90901724 A EP90901724 A EP 90901724A EP 90901724 A EP90901724 A EP 90901724A EP 0408704 B1 EP0408704 B1 EP 0408704B1
Authority
EP
European Patent Office
Prior art keywords
doctor
arrangement according
profiled
profiled strip
magnet
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
EP90901724A
Other languages
German (de)
English (en)
Other versions
EP0408704A1 (fr
EP0408704B2 (fr
Inventor
Johannes 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
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Priority claimed from AT3389A external-priority patent/AT392925B/de
Priority claimed from AT211289A external-priority patent/AT392746B/de
Application filed by Individual filed Critical Individual
Publication of EP0408704A1 publication Critical patent/EP0408704A1/fr
Publication of EP0408704B1 publication Critical patent/EP0408704B1/fr
Application granted granted Critical
Publication of EP0408704B2 publication Critical patent/EP0408704B2/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors
    • B41F15/46—Squeegees or doctors with two or more operative parts

Definitions

  • the invention relates to an arrangement for applying substances to sheet-like material, a doctor blade being magnetically pressed against the material or a template by means of a working magnet and being in contact with a profiled strip in the working position.
  • a so-called ink jam bar viewed in the direction of movement of the material web, is arranged in front of the roller doctor blade and this ink jam bar is influenced depending on the dimension and location, i.e. Distance to the application level, the application process.
  • a disadvantage of this prior art is that, in the event of an interruption in operation, the doctor element and the profiled strip have to be handled separately, which requires a greater amount of work and that there is a risk when using doctor rollers in which the ratio between diameter and length is very large that the doctor blades are bent and then can no longer be used.
  • the invention now wants to eliminate this disadvantage of the prior art and to create an arrangement which can be handled as a functional unit and in which the risk of bending doctor blades with a small diameter is largely avoided.
  • the invention is characterized in that at least one holding magnet is arranged in the profile bar, which holds the squeegee rolling or sliding on the profile bar when the working magnet is switched off and lifts it off the application surface or template.
  • the invention has made it possible to handle doctor element and profile strip as a functional unit. It is also no longer necessary to either interrupt the stencil movement in the event of a production interruption or to remove the squeegee elements from the stencils, but rather by lifting the squeegee element when the production is interrupted, the stencils can be rotated further without having any disadvantageous consequences.
  • self-positioning of the profile strip and thus of the doctor element occurs and it is now possible to use the most diverse types of doctor elements and also optionally to work with roller doctor blades of the most varied diameters.
  • FIG. 1 and 2 show two embodiments of the device according to the invention.
  • Fig. 3 shows a detail, in particular of the embodiment according to Fig. 1.
  • Figs. 4 and 5 to 8 are further embodiments of the invention, as do Figs. 9 and 10.
  • a profile bar 6 is pivotally arranged above a flat magnetic table, over which a material web 4 is guided in the direction of movement 3.
  • a magnetic holding strip 7 or, if appropriate, a plurality of magnetic holding elements arranged in series are used.
  • the holding magnet strip 7 or the row of holding magnets are preferably completely surrounded by the material of the profiled strip 6.
  • the profile bar 6 is attached to a tube 10 designed as a material feed and the pivoting can take place about the axis 12 of the tube. As can be seen from the drawing, the profile bar 6 ends in front of a template 5 or at a distance from the web 4.
  • height adjustment can also be provided in order to ensure adaptation to different material thicknesses or roll diameters.
  • a doctor blade 9 On the front surface 8 of the profile strip 6 in the direction of movement there is a doctor blade 9 which, in the operating state, is pressed against the template 5 or the web 4 by the working magnet 2.
  • the magnetic holding bar 7 comes into operation and the doctor blade 9 is lifted off the template 5 or web 4 and the doctor blade 9 is lifted off the template 5 or web 4 and in this lifted state from the magnetic bar 7 held on the surface 8, that is, the doctor roller 9 is pressed both in the operating state (solid lines) and in the switched-off state (shown in broken lines) to the surface 8, regardless of the size of the diameter of the doctor blade, so that this diameter can be selected down to 3 mm.
  • the smaller the diameter or the lower the weight the stronger and more securely the doctor element 9 is held, even when the device is being washed.
  • a doctor element 13 is also provided in FIG.
  • the device can also be used as a traffic jam or sealing guide. Because the profile bar 6 is pivotable, the substance jam angle in front of the doctor roller 9 and thus the job result can be changed during the operating state.
  • a doctor roller 9 or 13 on the front surface 8 and on the rear surface 11 at the same time.
  • either the doctor blade 9 or the doctor blade 13 can be brought over the center of the magnetic table and can be pressed against the template 5 or web 4 in the operating state.
  • the squeegee element 9 or 13 which is not used is lifted off the template 5 or the web 4 by the magnetic holding strip 7 and is held in this lifted-off state.
  • a width distribution device 15 is also incorporated into the profile bar 6, i.e. Channels that branch out and whose diameter becomes smaller and smaller, the substance then coming via the outlet 14 into the area in front of the profile strip 6.
  • a stop bracket 16 may also be present, as shown in FIG. 3.
  • the end part of the profile strip 6 is designed as a nose 17 and provided with a curve.
  • FIG. 4 shows a further advantageous arrangement that is made possible by the present invention. It is namely possible through the invention to also use non-rotating, round and / or otherwise profiled, bend-sensitive doctor elements, which opens up new possibilities for application technology. According to the current state of the art, it was impossible to loosely insert and use rods.
  • a carrier 18 is attached to the profile bar 6. This attachment can be mechanical, e.g. by means of a screw or also by means of the holding magnet 7.
  • a rod 19 is inserted into the carrier 18, which carries the actual doctor element 9 in a rotationally fixed but movable manner in the vertical direction.
  • the doctor element made of magnetizable material is pulled down and on the web 4 or the template 5 pressed.
  • the magnetic holding bar lifts the doctor element 9 into the dashed, i.e. withdrawn, position.
  • the rotation-disabled stopping of round bars is an inventive measure that has a surprising effect. Stopping the role, i.e. So the functional conversion of a doctor blade into a coating rod, depending on the substance, results in a measurable change in the application quantity, so that the technologically high-quality doctor blade application technology becomes even more flexible and varied in its applicability without incurring any significant costs. It is of course also possible to design the doctor element as a coating rod, which is slidably raised and lowered on the surface 8. Another possibility is to connect a round profile bar with a preferably very small diameter in a rotationally fixed manner to a profile bar with a rectangular cross section, which is loosely arranged in a holder and secured against tipping.
  • a profile body 20 is also attached to the profile bar 6.
  • This carries a doctor blade 21 which is pressed against the template 5 or the web 4.
  • a groove 22 is present in the profile body 20, which forms the receiving space for a doctor roller 9.
  • the substance is introduced into this space via openings 23.
  • the application quantity and quality can be controlled by the doctor blade 21 made of steel or plastic.
  • This device is particularly advantageous for low-viscosity substances and for small quantities.
  • the exit slot is labeled 24.
  • FIG.6 Another embodiment is shown in Fig.6.
  • a doctor element 13 can also be held in a groove 26 on the rear side 11 of the profiled strip 6.
  • the individual holding magnets can be made narrower than in the embodiments of FIGS. 1 and 2 and thus be provided closer to the corresponding contact surfaces 8 and 11, respectively. This makes the magnets work better.
  • the contact surfaces in the contact area of the doctor element 9 or 13 can be curved.
  • Figure 7 is another embodiment of the invention.
  • a recess 31 is incorporated in the profile bar 6, in which a doctor blade 13 is also located.
  • the holding magnet 7 between the recess 31 and the front surface 8 causes both the Squeegee on the surface 8 and the squeegee in the recess 31 when the working magnet is switched off are pressed against the respectively adjacent surface and lifted off the template 5 or the web 4.
  • the recess 31 can also be designed like a slide bearing.
  • a second holding magnet 30 can also be present above the recess 31, which then additionally acts on the doctor blade 13.
  • two doctor blades namely 9 and 13 to bring one of these doctor blades into the rest position, which can be done by pivoting or moving the profile strip 6.
  • it is also possible to fix the rollers here so that a round rod is available. It is also possible to insert profile bars with other profiles or a doctor blade.
  • FIG 8 shows an embodiment in which the profile strip 6 is provided with an additional strip 33 which carries a blade 34 at its lower end and thus delimits a color space 32.
  • a rotationally fixed rod doctor blade 35 is provided in the color space.
  • the lower surface 36 of the profile bar 6 can be used as a storage surface. This can be seen particularly clearly in FIG. 3. A pressure is exerted on the material to be applied located in the space between the storage surface 36 and the template 5 or the web 4, which supports the application process. The effect of the storage surface 36 becomes stronger the closer the profile strip 6 is placed in relation to the application surface or template. Due to the pivotability of the profile bar 6, the substance dust angle in front of the doctor element, i.e. the area 36 and thus the application result can be changed, since the substance pressure angle can be used to control the pressure exerted on the material and thus the amount of material applied per unit area can be controlled.
  • the squeegee can lie sealingly against one of the two inner walls of the recess machined in the profile strip 6 in the operating state, so that the penetration of application substance from the direction of movement 3 seen, the application area located in front of the doctor element, at the end of which the doctor element rests, reaches the area of the application surface located behind the doctor element 9, 13, 20 and 35.
  • the magnet 2 in the magnetic table can act on the doctor elements 9 and 13 on both sides of the profile bar 6 and there is then the possibility of working the doctor elements 9 and 13 on both sides of the profile bar 6 or to hold at rest.
  • the invention also has the advantage that the stencils can be rotated further by lifting the squeegee when production is interrupted, and the profile bar 6 and thus the squeegee also self-position. You can work with roller blades of various diameters and cleaning and handling is practically the same as with a "one-piece" device.
  • FIG. 9 shows a doctor blade profile strip 201, which is provided with a flexurally elastic and therefore deformable depending on the doctor pressure force 34 edge 34.
  • the permanent magnetic line 7 or, with the same function, a series of holding magnets arranged next to one another is inserted, so that the bar 201 is magnetically attached to the surface 50 outside the operating state.
  • a knife roller of small diameter is inserted in the narrow movement space 52, which - denoted by 9 - shows the application operating state and - denoted by 9 '- the magnetically attached position 9' detached from the application plane or template.
  • the holding magnet arrangement is shown at 7 '.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Unwinding Webs (AREA)
  • Seal Device For Vehicle (AREA)

Claims (23)

1. Installation d'application de substances sur un matériau en forme de bande (4), dans laquelle une racle (9, 13) est pressée au moyen d'un aimant de travail (2) par magnétisation contre le matériau ou contre un gabarit (5) et s'applique en position de travail contre une barre profilée (6), caractérisée en ce qu'il est associé à la barre profilée (6) au moins un aimant de maintien (7) qui maintient la racle (9, 13) lorsque l'aimant de travail (2) est hors service, par roulement ou coulissement contre la barre profilée (6) et soulève celle-ci de la surface d'application (4, 5) ou du gabarit.
2. Installation selon la revendication 1, caractérisée en ce que l'aimant de maintien (7) dans la barre profilée (6) est constitué par un aimant permanent.
3. Installation selon la revendication 1 ou 2, caractérisée en ce que la racle (9, 13) est constituée par un rouleau, une tige ronde ou une tige profilée (201) présentant, par exemple, une section transversale rectangulaire et une arête profilée de racle (21).
4. Installation selon l'une des revendications précédentes, caractérisée en ce que la surface d'application (8, 11) de la barre profilée (6) présente de préférence dans la région, où la racle (9,13) s'applique en position de travail contre la barre profilée (6), des rainures qui s'étendent perpendiculairement ou de manière oblique relativement à l'axe de la racle (9, 13).
5. Installation selon l'une des revendications précédentes, caractérisée en ce que la surface de la racle roulante est structurée.
6. Installation selon l'une des revendications précédentes, caractérisée en ce que la barre profilée (6) peut être pivotée autour d'un axe qui s'étend parallèlement à l'axe de la racle (9, 13) et à l'arête profilée de racle (21), respectivement, de la tige profilée (201).
7. Installation selon l'une des revendications précédentes, caractérisée en ce qu'il est prévu dans la barre profilée (6) un évidement (31), ou que celle-ci présente un élément de retenue en forme de cage (16) dans lequel est disposée une racle (9, 13).
8. Installation selon la revendication 7, caractérisée en ce que la barre profilée (6) porte sur son côté arrière un élément de retenue en forme de cage (16) dans lequel est prévue une racle (9, 13).
9. Installation selon l'une des revendications précédentes, caractérisée en ce qu'au moins un autre aimant supplémentaire est disposé au-dessus de l'évidement (31).
10. Installation selon l'une des revendications précédentes, caractérisée en ce que l'évidement (31) est réalisé à la manière d'un palier à glissement et comprend une partie de la surface du rouleau formant racle (9, 13).
11. Installation selon l'une des revendications précédentes, caractérisée en ce que la racle est réalisée sous forme de rouleau (39, 35) et est assurée contre une torsion par une broche (figures 4, 8).
12. Installation selon l'une des revendications précédentes, caractérisée en ce que l'évidement (32) servant de logement à la couleur est délimité devant la barre profilée (6) par une barre supplémentaire (33).
13. Installation selon l'une des revendications précédentes, caractérisée en ce que l'évidement (31, 22) comprend plus de la moitié de la surface de pourtour d'un rouleau ou d'une tige ronde d'un diamètre plus grand, tandis que des rouleaux ou éléments formant racle d'enduction dont le diamètre est inférieur à la largeur de la fente ne sont maintenus que par un ou plusieurs aimants de maintien (7).
14. Installation selon l'une des revendications précédentes, caractérisée en ce que la racle est maintenue, lorsqu'elle est en fonction de travail, de façon à s'appliquer par magnétisation contre deux surfaces au moyen de l'aimant de travail (2) et de l'aimant de maintien (7).
15. Installation selon l'une des revendications précédentes, caractérisée en ce que, par pivotement de la barre profilée (6), la racle (9) peut être amenée sur un côté (8) de la barre profilée (6) ou la racle (13) sur le côté opposé (11) de la barre profilée (6) en position de travail et de repos, respectivement.
16. Installation selon l'une des revendications précédentes, caractérisée en ce que l'aimant (2) et le champ magnétique qu'il produit est suffisamment large pour pouvoir attirer en même temps deux rouleaux formant racle (9, 13) se trouvant à une certaine distance l'un de l'autre (figure 2).
17. Installation selon l'une des revendications précédentes, caractérisée en ce que la barre profilée (6), le cas échéant avec des barres profilées additionnelles (20, 33) fixées sur celle-ci présente un évidement en forme de rainure (22, 32, 52) dans lequel est posé ou mis en place l'élément formant racle (9, 13, 201, 35).
18. Installation selon l'une des revendications précédentes, caractérisée en ce que la barre profilée (6) est réglable en hauteur par un support transversal (10), c'est-à-dire qu'elle est disposée de manière à pouvoir changer sa position locale par rapport au plan d'application.
19. Installation selon l'une des revendications précédentes, caractérisée en ce que l'élément formant racle (9, 13, 35, 201) s'applique de manière étanche dans l'état de fonctionnement contre l'une des deux parois internes de l'évidement (22, 32, 52) pratiqué dans la barre profilée (6), de sorte que le matériau d'application ne peut pas passer de la zone d'application qui se situe, vu dans la direction de déplacement (3), devant l'élément formant racle, à l'extrémité de laquelle l'élément formant racle est en application, dans la zone de la surface d'application située derrière l'élément formant racle (9, 13, 35, 201).
20. Installation selon l'une des revendications précédentes, caractérisée en ce que la barre profilée (201) présente une arête élastique ou supporte une lame (21).
21. Installation selon l'une des revendications précédentes, caractérisée en ce que l'élément formant racle est réalisé de façon à répondre à la flexion, par exemple, par des entailles.
22. Installation selon l'une des revendications précédentes, caractérisée en ce que deux éléments formant racle étroits sont prévus l'un à côté de l'autre et les deux peuvent être appliqués par magnétisation.
23. Installation selon l'une des revendications précédentes, caractérisée en ce que la barre profilée (201) présente une arête de travail élastique (21) qui, lorsque la force de travail est modifiée, peut être déformée, et que dans le cas d'une modification, le coin de couleur influençant l'effet d'application de la couleur, dans cette zone élastique déformée par la force d'application, peut également être modifiée quant à sa forme en section transversale ou son angle d'ouverture ou son volume récepteur de substance.
EP90901724A 1989-01-09 1990-01-05 Installation d'application de substances sur une bande de materiau Expired - Lifetime EP0408704B2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
AT3389A AT392925B (de) 1989-01-09 1989-01-09 Auftragungsmaschine bzw. -vorrichtung zum beschichten, impraegnieren oder bemustern von bahnenfoermigem material
AT33/89 1989-01-09
AT2112/89 1989-09-08
AT211289A AT392746B (de) 1989-09-08 1989-09-08 Anordnung zum auftragen von substanzen auf bahnfoermiges material
PCT/AT1990/000002 WO1990007387A2 (fr) 1989-01-09 1990-01-05 Installation d'application de substances sur une bande de materiau

Publications (3)

Publication Number Publication Date
EP0408704A1 EP0408704A1 (fr) 1991-01-23
EP0408704B1 true EP0408704B1 (fr) 1993-06-16
EP0408704B2 EP0408704B2 (fr) 1998-07-15

Family

ID=25591186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90901724A Expired - Lifetime EP0408704B2 (fr) 1989-01-09 1990-01-05 Installation d'application de substances sur une bande de materiau

Country Status (9)

Country Link
US (1) US5151132A (fr)
EP (1) EP0408704B2 (fr)
AT (1) ATE90595T1 (fr)
BR (1) BR9004513A (fr)
CZ (1) CZ280958B6 (fr)
DD (2) DD291508A5 (fr)
DE (2) DE59001764D1 (fr)
ES (1) ES2041524T5 (fr)
WO (1) WO1990007387A2 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9103571U1 (de) * 1991-03-21 1992-07-23 Zimmer, Johannes, Klagenfurt, Kärnten Rakelgerät
DE59106731D1 (de) * 1991-03-21 1995-11-23 Johannes Zimmer Rakelgerät.
DE9103570U1 (de) * 1991-03-21 1992-07-23 Zimmer, Johannes, Klagenfurt, Kärnten Rakelgerät
GB2259262B (en) * 1991-09-03 1995-04-12 Univ Hull Blade control system
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
NL9301820A (nl) * 1993-10-20 1995-05-16 Stork Screens Bv Rakelsamenstel.
DE29517098U1 (de) * 1995-10-17 1997-02-13 Zimmer, Johannes, Klagenfurt Auftragungsvorrichtung
US5925187A (en) * 1996-02-08 1999-07-20 Speedline Technologies, Inc. Apparatus for dispensing flowable material
US5938106A (en) * 1996-08-01 1999-08-17 International Business Machines Corporation Method and apparatus for applying solder and forming solder balls on a substrate
US6066206A (en) 1997-02-21 2000-05-23 Speedline Technologies, Inc. Dual track stenciling system with solder gathering head
DE19735026C1 (de) * 1997-08-13 1999-05-27 Freudenberg Carl Fa Vorrichtung zur Beschichtung einer Materialbahn mit einer Paste
NL1011992C2 (nl) * 1999-05-07 2000-11-09 Stork Brabant Bv Rakelinrichting.
JP4365479B2 (ja) * 1999-05-18 2009-11-18 東北リコー株式会社 孔版印刷装置
DK2059392T3 (da) * 2006-08-29 2010-10-04 Daetwyler Swisstec Ag Rakel
CN113140403B (zh) * 2021-04-23 2023-03-10 江西粤磁稀土新材料科技有限公司 一种钕铁硼生产用便于整理的粘料机

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216349A (en) * 1963-02-21 1965-11-09 Johannes Zimmer Maschf Apparatus for treating sheet material
AT266024B (de) † 1967-05-26 1968-11-11 Johannes Zimmer Einrichtung an Rundschablonen
US3988986A (en) * 1972-04-10 1976-11-02 Peter Zimmer Anti-drooling device for screen-printing machine
DE2302084B2 (de) * 1973-01-17 1975-01-16 Kuesters, Eduard, 4150 Krefeld Rakelvorrichtung für den Siebdruck
DE2437006A1 (de) † 1974-08-01 1976-02-19 Zimmer Johannes Einrichtung zur regelung der anpresskraft eines magnetwalzensystems
AT349419B (de) * 1974-09-12 1979-04-10 Zimmer Johannes Magnetbalken zur behandlung von warenbahnen
DE2544784C2 (de) * 1974-10-15 1986-01-23 Johannes Klagenfurt Kärnten Zimmer Rakelvorrichtung
DE3001073B1 (de) * 1980-01-14 1981-06-04 Jagenberg-Werke AG, 4000 Düsseldorf Vorrichtung zum Aufbringen einer Beschichtung auf eine Materialbahn
AT377476B (de) † 1983-05-24 1985-03-25 Zimmer Johannes Rakelgeraet fuer flachschablonen mit zwei im abstand zueinander angeordneten rakelleisten
JPS63121537U (fr) * 1987-01-31 1988-08-08
DE8709028U1 (de) * 1987-06-30 1988-11-03 Zimmer, Johannes, Klagenfurt, Kärnten Einrichtung zur Führung einer Rolle beim Auftragen einer Substanz auf eine Warenbahn
EP0311728B1 (fr) † 1987-10-10 1993-03-10 Johannes Zimmer Dispositif de raclage
AU1722188A (en) * 1987-10-10 1989-05-02 Johannes Zimmer Spreading appliance
US5211219A (en) * 1990-07-31 1993-05-18 Daikin Industries, Ltd. Air conditioner

Also Published As

Publication number Publication date
ATE90595T1 (de) 1993-07-15
DD291508A5 (de) 1991-07-04
EP0408704A1 (fr) 1991-01-23
DD298491A5 (de) 1992-02-27
DE59001764D1 (de) 1993-07-22
CZ280958B6 (cs) 1996-05-15
ES2041524T3 (es) 1993-11-16
ES2041524T5 (es) 1998-10-16
EP0408704B2 (fr) 1998-07-15
BR9004513A (pt) 1991-07-30
DE9000148U1 (de) 1990-04-12
WO1990007387A2 (fr) 1990-07-12
WO1990007387A3 (fr) 1990-11-01
US5151132A (en) 1992-09-29

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