EP0384914B1 - Installation de coupe pour découper des flans dans des pièces découpées de matière en ruban - Google Patents

Installation de coupe pour découper des flans dans des pièces découpées de matière en ruban Download PDF

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Publication number
EP0384914B1
EP0384914B1 EP90890042A EP90890042A EP0384914B1 EP 0384914 B1 EP0384914 B1 EP 0384914B1 EP 90890042 A EP90890042 A EP 90890042A EP 90890042 A EP90890042 A EP 90890042A EP 0384914 B1 EP0384914 B1 EP 0384914B1
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EP
European Patent Office
Prior art keywords
cutting
waste
band
roller
deflecting roller
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
EP90890042A
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German (de)
English (en)
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EP0384914A1 (fr
Inventor
Gottfried Dipl.-Ing. Blaimschein
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Individual
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Individual
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Filing date
Publication date
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Publication of EP0384914A1 publication Critical patent/EP0384914A1/fr
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/3806—Cutting-out; Stamping-out wherein relative movements of tool head and work during cutting have a component tangential to the work surface
    • B26F1/3813—Cutting-out; Stamping-out wherein relative movements of tool head and work during cutting have a component tangential to the work surface wherein the tool head is moved in a plane parallel to the work in a coordinate system fixed with respect to the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/01—Means for holding or positioning work
    • B26D7/018—Holding the work by suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1827—Means for removing cut-out material or waste by tearing

Definitions

  • the invention relates to a cutting system for cutting blanks from tape material, for example prepregs covered with film on one or both sides, with a cutting table which can be subjected to vacuum and which has a conveyor belt forming the working surface, a cutting unit which can be moved over the working surface and which is preferably adjustable to a specific cutting depth Has cutting tool, as well as a material dispenser in the conveying direction before and a material storage in the conveying direction after the cutting table.
  • a cutting system is known from DE-A-3 341 651.
  • prepregs are understood to mean pre-impregnated fiber works which are impregnated with a predetermined proportion of reactive resin and which can be cured under heat without further additions.
  • the desired blanks are then cut out from this starting strip material, which is pre-fabricated in a roll-up form with a cover film on one or both sides, on a suitable cutting system, according to an outline matched to the actual end product, the individual blanks forming a so-called nesting pattern to minimize the waste should.
  • the cutting systems themselves have a cutting table with an ar that can be pressurized beits Structure for holding the cutting material and a cutting unit with a cutting knife adjustable to a certain depth of cut, in particular an ultrasonic knife, which is a cutting knife vibrating with ultrasonic frequency, for automated cutting of the blanks on (US-A 4 028 167 and 4 514 246, DE-A 33 41 651), it also being known to use a so-called conveyor table as the cutting table, which has a conveyor belt guided over the suction boxes of the table (US Pat. No. 4,542,672).
  • This conveyor belt which can be driven step by step, results in sections of the work surface and at the same time serves for material supply and removal, the material being drawn off from a material dispenser upstream of the cutting table onto the conveyor belt and being introduced into a material storage area from the conveyor belt.
  • the strip material is cut to length on the feed side in the corresponding work area and each section is machined for itself, so that the cutting process has to be coordinated with a limited nest length, which inevitably brings with it larger amounts of waste due to the restricted freedom in nest design.
  • the invention is therefore based on the object to eliminate these deficiencies and to provide a cutting system of the type described, which allows a particularly efficient operation in a relatively simple manner, ensures the processing of nests of any length and, above all, also enables automatic waste disposal.
  • the cutting table accommodates a waste collector, which consists of a longitudinal slide that can be pushed back and forth along the conveyor belt for collecting the waste, with a deflection roller that can be placed on the belt material with its axis transverse to the direction of conveyance, and one that rotates above the deflection roller. and drivably mounted storage roll, to which storage roll the waste parts connected in the longitudinal direction of the conveyor belt are fastened with their start separated from the belt material and pulled around the deflection roll.
  • a waste collector which consists of a longitudinal slide that can be pushed back and forth along the conveyor belt for collecting the waste
  • a deflection roller that can be placed on the belt material with its axis transverse to the direction of conveyance, and one that rotates above the deflection roller.
  • storage roll to which storage roll the waste parts connected in the longitudinal direction of the conveyor belt are fastened with their start separated from the belt material and pulled around the deflection roll.
  • the conveyor belt which can be controlled depending on the distance traveled, allows the desired increase in the Work surface and thereby an at least step-by-step processing of any nest lengths, with the waste being removed directly from the waste collector and separated from the blanks after each cutting operation directly at the cutting table.
  • the newly brought into the working area band material is processed with the cutting unit and then or in an overlapping manner freed of waste, for which purpose the longitudinal slide of the waste collector is moved against the conveying direction and thereby the waste is pulled over the deflection roller attached to the belt material and opened the storage roll is wound up.
  • the conveyor belt then only contains the belt material that has been freed of waste, that is, depending on the type of belt alone, the blanks or a cutting to the depth of a film-covered band, the lower cover film and the blanks adhering to it, and a subsequent conveying step brings this waste-free band piece into the material storage adjoining the cutting table.
  • the longitudinal slide returns synchronously to the starting position and after this conveying step is complete, the system is ready for a new cutting and waste separation process, whereby there is no restriction to prepreg belts, but any band material can be processed.
  • a cutting device is provided between the waste collector and the material deposit, the cutting device can be cut to length with the film-covered tape material, the cuts of which are connected after the waste separation via the uncut film, after each individual conveying step or only after several conveying steps actuated and the finished strip material is cut off for removal, which can then be removed from the material storage in the desired length. Since the waste is drawn off before the pieces of tape carrying the blanks are cut to length, the waste remains as a whole and can be removed without interruption over the entire length of the tape material, which eliminates frequent manual clamping of the waste in the storage roll and rationalizes the separation process. Therefore, nests of different lengths can be processed step by step and, as desired, blanks of individual nests or several connected nests can be cut to length and rolled up, the vacuum application of the cutting table being interrupted during the individual conveying steps for functional and economic reasons.
  • the material deposit includes a roll-up device for the strip material
  • the roll-up device has a collecting basket, the wall of which forms a deflecting path for the strip material that curves upward and backward in relation to the conveying direction in relation to the feed area, it occurs when the strip material is deposited by pushing it in into the collecting basket independently for rolling up the tape loosely without a winding core or the like and winding the cut-to-length pieces of tape no longer requires manual intervention. Without delaying the workflow and without affecting the rest of the working process, these finished rolls of tape can then be removed from the material deposit and further processed or treated in any way.
  • the deflection path of the collecting basket has to ensure that the band material inserted into the basket is turned over and thus the core-free rolling up of the band, so that the path is to be adapted to the respective band material in its course and special configuration.
  • a wall part moving in the direction of deflection and roll-up such as an arcuate belt conveyor or additional air jet devices and the like.
  • the wall consists of rods, pipes or the like which are mounted transversely to the conveying direction and are rotatably and drivably mounted, each of which is connected in pairs by belt loops . In a structurally simple manner, this results in a cage wall which further conveys the tape and which ensures that the tape is securely wrapped in and folded over and rolled up.
  • the deflection roller can be raised and lowered on the longitudinal slide and a cutting device is provided in the attachment area of the deflection roller, whereby on the one hand lifting the deflection roller unhindered the insertion of a new band or the like, the waste collector on different Band strengths can be set u. Like. Or the waste material can be cut to length if necessary.
  • a receptacle for an additional material dispenser roll is arranged in the storage-side end region of the cutting table above the conveyor belt with a belt that has a carrier film facing away from the conveyor belt and that can be moved around the raised deflection roller and can be clamped with the carrier film on the storage roller a first step by moving the waste collector away from the material dispenser roll and then in a second step after lowering the deflecting roller and cutting the band down to the carrier film with the cutting device by moving the waste collector back onto the already existing band material, the carrier film being simultaneously possible can be detached from the belt and wound up on the storage roll, the waste collector can not only be used to separate the waste from the belt material lying on the conveyor belt, but also for opening one or more layers of such tape material to produce two or more layered cut materials.
  • a material dispenser roll only needs to be inserted into the receptacle and the additional belt from the dispenser roll but the deflection roll of the waste collector to its storage roll and to be fixed there.
  • the longitudinal slide moves against the conveying direction with the deflection roller raised and pulls the belt with the carrier film from the top of the dispenser roll, then the deflection roller is placed on the existing belt material on the conveyor belt, cut the new belt without cutting through the carrier film in the attachment area and at Retraction of the longitudinal slide, the new tape pulled from the dispenser roll is rolled up through the deflection roll onto the existing tape material at the table, while at the same time the carrier film is wound onto the storage roll. In the starting position, the tape is cut again and, due to the carrier film remaining uncut here, you can start again with the deflection roller raised.
  • a cutting system 5 which has a cutting table 6 which can be pressurized and a conveyor belt 8 which is guided over the suction boxes 7 of the cutting table 6 and forms the working surface, and a cutting unit 9 which can be moved over the working surface.
  • This cutting unit 9 has a cutting knife 10 which is guided according to the cutting feed and allows cutting to depth, that is to say cutting with a precisely adjustable depth of cut.
  • the cutting unit 9 can be equipped with an additional feed device 11, a gripper device 12 and the like. The like. Additional and auxiliary devices to facilitate the cutting and feeding work equipped.
  • the material transport at the cutting table 6 takes place via the conveyor belt 8, which runs over deflection rollers 13 from a unwinding drum 14 in the inlet end area of the table 6 to a winding drum 15 in the outlet end area of the cutting table and is moved step by step by a drive, not shown, depending on the conveyed path can.
  • a drive not shown, depending on the conveyed path can.
  • the strip material 1 to be processed comes to the work surface via a material dispenser 16 which is upstream of the cutting table 6 in the conveying direction of the conveyor belt 8 and which receives one or more dispenser rolls 17.
  • the strip material 1 to be processed is drawn off from the respective dispenser roll 17 held in a corresponding delivery position and placed on the conveyor belt 8, which then unwinds the material from the dispenser roll 17 on the feed side in accordance with the processing sequence and conveys it on the discharge side into a material tray 18 arranged downstream of the cutting table 6 .
  • a cutting device 19 In the material depositing end of the table 6 there is also a cutting device 19 so that a tape, the cuts of which are still connected after processing, is cut to length in desired pieces and the tape pieces come individually into the material depositing device 18.
  • the material tray 18 is equipped with a roll-up device 20 in order to be able to roll up the finished pieces of tape and remove them individually from the cutting system 5.
  • This rolling device 20 has a collecting basket 21 on, the wall of which consists of bars 22 lying transversely to the conveying direction and these strap loops 23 connecting them in pairs.
  • the bars 22 are rotatable in the side walls 24 and can be driven via a chain drive 25, which is only indicated, so that the collecting basket 21 forms a deflecting path for the inserted strip material 1 which moves in the conveying direction, curves upwards and backwards.
  • the strip material can be loosely rolled up by this deflection path without a winding core and can be removed from the material storage 20 immediately after being cut to length.
  • a waste collector 26 is provided on the cutting table 6, which consists of a longitudinal slide 27 that can be pushed back and forth along the conveyor belt 8, with a deflection roller 28 that is transverse to the direction of conveyance, adjustable in height and attachable to the belt material, and one above the deflection roller 28 rotatably and drivably mounted storage roller 29. If there is now the band material on the conveyor belt 8, after processing by the processing unit or the cutting unit 9, the waste can be automatically separated from the blanks by, as indicated in FIG. 2, the waste being drawn off via the deflection roller 28 and onto the Storage roll 29 is wound up while the longitudinal slide 27 of the waste collector is moved against the conveying direction.
  • a cutting device 30 is arranged on the longitudinal slide 27 of the waste collector 26 in the region of the deflecting roller 28 and a receptacle 31 for an additional material dispenser roller 32 is also provided in the storage-side end region of the cutting table 6, the waste collector 26 can be used except for separation Use the waste from the tape material to stack two or more tapes. All that is required is for the new belt 33, which is provided with a carrier film, to be pulled off the material dispenser roll 32 and to be guided and clamped via the deflecting roll 28 to the storage drum 29, and the new belt 33 is placed on the belt 1 lying on the conveyor belt 8 by Movement of the longitudinal slide 27 in cooperation with the deflection roller 28.
  • the deflection roller 28 When the deflection roller 28 is raised and the longitudinal slide 27 moves back, the new belt 33 is pulled off in the desired length, then the deflection roller 28 is lowered and presses the new belt 33 onto the belt 1, so that after cutting the tape 33 with the cutting device 30, in which, however, the overlying carrier film remains uncut and when the longitudinal slide 27 is retracted, the new band 33 is rolled up onto the band 1 via the deflecting roller 28, and at the same time the carrier film is pulled off and wound onto the storage drum 29.
  • multilayer tapes can be created and then blanks can be cut out of multilayer prepregs or the like, and by correspondingly lining up the individual sections adapted to the work surfaces it is possible to manufacture such multilayer tapes for as long as desired.
  • the cutting system 5 is characterized by its efficient mode of operation and in particular by the possibility of performing an automatic waste separation directly on the cutting table after the respective processing and not only gradually processing pieces of any length, but also dividing the finished, waste-free pieces of any length to put down and take off rolled up.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Processing Of Solid Wastes (AREA)
  • Control Of Cutting Processes (AREA)

Claims (6)

1. Installation de découpage (9) destinée à découper des flans dans une matière en bande (1), par exemple un matériau pré-imprégné (Prepreg) revêtu d'une pellicule sur une face ou sur les deux faces, comprenant une table de coupe (6) pouvant être chargée par une dépression, qui présente une bande transporteuse (8) formant la surface de travail, un groupe de coupe (9) qu'on peut faire circuler au-dessus de la surface de travail et qui présente un outil de coupe (10) pouvant de préférence être réglé à une profondeur de coupe déterminée, ainsi qu'un distributeur de matière (16) situé en amont de la table de coupe (6) dans le sens du transport et une réception de matière (18) située en aval de la table de coupe dans le sens du transport, caractérisée en ce que le table de coupe (6) porte un collecteur de chute (26) qui est composé d'un chariot longitudinal (27) qu'on peut faire coulisser dans un sens et dans l'autre le long de la bande transporteuse (8) pour accumuler la chute, et qui comporte un rouleau de renvoi (28) dont l'axe est disposé transversalement à la direction de transport et qui peut être appuyé sur la matière en bande (1) et un rouleau accumulateur (29) monté au-dessus du rouleau de renvoi (28), mobile en rotation et pouvant être entrâiné, auquel rouleau accumulateur (29) les parties de chute (4) qui sont d'un seul tenant dans la direction longitudinale de la bande transporteuse (8) sont fixées, pour s'y enrouler, par leur partie initiale séparée de la matière en bande (1) et tirée autour du rouleau de renvoi (28).
2. Installation de découpage selon la revendication 1, caractérisée en ce qu'un dispositif de coupe (19) est prévu entre le collecteur de chute (26) et la réception de matière (18), pour couper la matière en bande (1) à longueur.
3. Installation de découpage selon la revendication 1 ou 2, caractérisé en ce que la réception de matière (18) comprend un dispositif d'enroulement (20) pour la matière en bande (1), lequel dispositif d'enroulement (20) comprend un panier récepteur (21) dont la paroi forme une voie de déviation pour la matière en bande (1) qui, à la suite de la région d'entrée, se recourbe vers le haut et vers l'arrière relativement au sens du transport.
4. Installation de découpage selon la revendication 3, caractérisé en ce que la paroi est composée de barreaux (22) disposés transversalement à la direction du transport, montés mobiles en rotation et pouvant être entraînés, et qui sont reliés entre eux, par paires, par des boucles de courroie (23).
5. Installation de découpage selon la revendication 1, caractérisée en ce que le rouleau de renvoi (28) du collecteur de chute (26) est guidé sur le chariot longitudinal (27) de façon à être mobile en mouvement montant et descendant, et un dispositif de coupe (30) est prévu dans la région d'appui du rouleau de renvoi (26).
6. Installation de découpage selon la revendication 5, caractérisé en ce que, dans la région d'extrémité, côté réception, de la table de coupe (6), est agencée, au-dessus de la bande transporteuse (8), un support (31) servant à porter un rouleau distributeur de matière supplémentaire (32), muni d'une bande (33) qui présente une feuille support sur sa face la plus éloignée de la bande transporteuse, cette bande (33), qu'on peut faire passer autour du rouleau de renvoi (28) relevé et qui peut être serrée contre le rouleau accumulateur (29) avec le feuille support, pouvant être dévidée du rouleau distributeur de matière (32) par le mouvement d'avance du collecteur de chute (26) dans une première étape, tandis qu'ensuite, dans une deuxième étape, après que le rouleau de renvoi (8) a été abaissé et que la bande (33) a été coupée dans toute son épaisseur à l'exception de la feuille support, au moyen du dispositif de coupe (30), elle peut être appliquée en supplément sur la matière en bande (1) déjà présente par un mouvement de recul du collecteur de chute (26), la feuille support pouvant être en même temps détachée de la bande (33) et enroulée sur le rouleau accumulateur (29).
EP90890042A 1989-02-21 1990-02-20 Installation de coupe pour découper des flans dans des pièces découpées de matière en ruban Expired - Lifetime EP0384914B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0038189A AT394515B (de) 1989-02-21 1989-02-21 Schneidanlage zum ausschneiden von zuschnitten aus bandmaterial
AT381/89 1989-02-21

Publications (2)

Publication Number Publication Date
EP0384914A1 EP0384914A1 (fr) 1990-08-29
EP0384914B1 true EP0384914B1 (fr) 1992-08-05

Family

ID=3489076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90890042A Expired - Lifetime EP0384914B1 (fr) 1989-02-21 1990-02-20 Installation de coupe pour découper des flans dans des pièces découpées de matière en ruban

Country Status (5)

Country Link
US (1) US5080297A (fr)
EP (1) EP0384914B1 (fr)
AT (1) AT394515B (fr)
DE (1) DE59000230D1 (fr)
ES (1) ES2034851T3 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5101747A (en) * 1989-12-19 1992-04-07 Gerber Garment Technology, Inc. Apparatus and method for separating pattern pieces from waste material
US5313957A (en) * 1990-01-05 1994-05-24 Medamicus, Inc. Guide wire mounted pressure transducer
IT1255349B (it) * 1992-07-17 1995-10-31 Dispositivo di alimentazione di tessuti in rotolo per tavoli da tagliodi tessuto in singoli strati
US5746388A (en) * 1995-11-06 1998-05-05 Eastman Kodak Company Photographic film storage receptacle with constrained film spooling loops
EP0841131A1 (fr) * 1996-11-07 1998-05-13 Bullmer Spezialmaschinen GmbH Dispositif de coupe avec réglage de profondeur de coupe
DE19729530C2 (de) * 1997-07-10 1999-05-20 Voith Sulzer Finishing Gmbh Rollenschneider
JPH11321830A (ja) * 1998-05-21 1999-11-24 Isowa Hooper Swift:Kk ウェブ巻装ロールの包装材除去装置
FR2783191B1 (fr) 1998-09-16 2000-12-15 Lectra Systemes Sa Coupe automatique de pieces dans une matiere en feuille
KR100948969B1 (ko) * 2007-07-16 2010-03-23 주식회사 엘지화학 높은 재단 효율성으로 직사각형 단위체들을 제조하는 방법
ES2346621B1 (es) * 2008-12-23 2011-08-03 Airbus Operations, S.L. Procedimiento y dispositivo para la obtencion de piezas longitudinales.
KR101522167B1 (ko) * 2013-02-20 2015-05-21 주식회사 엘지화학 높은 재단 효율성으로 직사각형 단위체들을 제조하는 방법
EP3699304B1 (fr) * 2019-02-19 2022-09-14 Comelz S.p.A. Appareil de fixation et de découpe améliorées de matériau en feuilles
CN110666989B (zh) * 2019-09-27 2021-05-18 路德通电子设备（北京）有限公司 一种石墨双包边生产设备
CN116443638B (zh) * 2023-03-10 2023-10-24 江苏风驰碳基新材料研究院有限公司 一种钠离子电池生产用电极片切割装置

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Publication number Priority date Publication date Assignee Title
US4028167A (en) * 1976-07-29 1977-06-07 Gerber Garment Technology, Inc. Label applicator for automatically controlled cutting machine
DE3341651A1 (de) * 1982-12-29 1984-07-12 Gerber Garment Technology, Inc., South Windsor, Conn. Verfahren und vorrichtung zum herstellen von zuschnitten
US4514246A (en) * 1982-11-03 1985-04-30 Gerber Garment Technology, Inc. Method of cutting and labeling sheet material
US4542672A (en) * 1983-12-02 1985-09-24 Gerber Garment Technology, Inc. Sheet material conveyor loading apparatus

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US3360210A (en) * 1965-06-22 1967-12-26 Charles D Ingraham & Sons Inc Waste stripper for label-making machines
GB2040778B (en) * 1979-01-29 1982-09-22 Letraset International Ltd Manufacture of die cut vinyl lettering
US4346855A (en) * 1980-07-24 1982-08-31 Elizabeth S. Biggar Stripping method and apparatus for the processing of a continuous laminated web
US4809921A (en) * 1988-02-01 1989-03-07 Willie B. Dueck Apparatus for dispensing and re-rolling floor covering materials
AT393983B (de) * 1988-10-04 1992-01-10 Gfm Holding Ag Schneidanlage zum ausschneiden von zuschnitten aus bandfoermigem ausgangsmaterial, insbesondere von ein- oder beidseitig folienbedeckten prepregs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028167A (en) * 1976-07-29 1977-06-07 Gerber Garment Technology, Inc. Label applicator for automatically controlled cutting machine
US4514246A (en) * 1982-11-03 1985-04-30 Gerber Garment Technology, Inc. Method of cutting and labeling sheet material
DE3341651A1 (de) * 1982-12-29 1984-07-12 Gerber Garment Technology, Inc., South Windsor, Conn. Verfahren und vorrichtung zum herstellen von zuschnitten
US4542672A (en) * 1983-12-02 1985-09-24 Gerber Garment Technology, Inc. Sheet material conveyor loading apparatus

Also Published As

Publication number Publication date
US5080297A (en) 1992-01-14
DE59000230D1 (de) 1992-09-10
EP0384914A1 (fr) 1990-08-29
ATA38189A (de) 1991-10-15
AT394515B (de) 1992-04-27
ES2034851T3 (es) 1993-04-01

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