EP0534959B1 - Dispositif de bobinage pour machines a decouper a roulettes du type a cylindre d'appui ou similaire - Google Patents

Dispositif de bobinage pour machines a decouper a roulettes du type a cylindre d'appui ou similaire Download PDF

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Publication number
EP0534959B1
EP0534959B1 EP90912625A EP90912625A EP0534959B1 EP 0534959 B1 EP0534959 B1 EP 0534959B1 EP 90912625 A EP90912625 A EP 90912625A EP 90912625 A EP90912625 A EP 90912625A EP 0534959 B1 EP0534959 B1 EP 0534959B1
Authority
EP
European Patent Office
Prior art keywords
drive
reeling
reel
supporting
belt
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
EP90912625A
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German (de)
English (en)
Other versions
EP0534959A1 (fr
Inventor
Jürgen TREUTNER
Walter Dörfel
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.)
Beloit Technologies Inc
Original Assignee
Beloit Technologies Inc
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 Beloit Technologies Inc filed Critical Beloit Technologies Inc
Priority to AT90912625T priority Critical patent/ATE101581T1/de
Publication of EP0534959A1 publication Critical patent/EP0534959A1/fr
Application granted granted Critical
Publication of EP0534959B1 publication Critical patent/EP0534959B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/26—Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/413—Supporting web roll
    • B65H2301/4134—Both ends type arrangement
    • B65H2301/41346—Both ends type arrangement separate elements engaging each end of the roll (e.g. chuck)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/414—Winding
    • B65H2301/4148—Winding slitting

Definitions

  • the invention relates to a winding device with the features specified in the preamble of claim 1.
  • Such winding devices are mainly used in slitter rewinder. While in reel cutting machines of the support roller type, in which the reel to be wound up rests on one or two rotating support rollers with their own weight, so that the own weight of the reel to be wound ensures that the slip-free torque transmission of the support roller (s) to the reel to be wound up If the required contact pressure is sufficient, it is necessary for roll cutting machines of the back-up roll type - regardless of whether only the back-up roll or the back-up roll and the winding tubes of the rolls to be wound are driven in the direction of rotation - to ensure a sufficient contact pressure between the roll to be wound up and the back-up roll.
  • the support arms or the support frames are pivotally attached such that the pivoting movement of these support arms or support frames follows the change in diameter of the roll during the winding process; in this case, the support arms or support frames are pivoted by means of a hydraulic cylinder, the contact pressure being able to be applied to the support roller via the hydraulic cylinder.
  • the other way of applying the contact pressure is to keep the support arms or support frames in the same position throughout the entire winding cycle and to mount the clamping heads for the winding cores of the rolls to be wound up on a slide each, which is located in one on the support arm or .
  • the support attached to the guide roller to or away from it can move, and, z. B. via a lever arm and a hydraulic cylinder pivoting the lever arm to apply a force acting in the direction of the support roller (contact pressure).
  • the invention relates to both of the above options for letting the winding axis follow the change in diameter during the winding process.
  • the sleeves or rolls, on which the partial webs created by longitudinal division are wound lie laterally on one or two support rollers arranged parallel to one another, preferably next to one another. Because of the space required in the axial direction of the support roller (s) for the support arms of the support rollers, the directly adjacent partial webs are wound on opposite sides with respect to the support roller (s). With such roll cutting machines, it is desirable to be able to wind rolls of the smallest possible web width if necessary.
  • the object of the invention is to provide an improved center drive for the winding shaft for winding devices with the generic features mentioned at the outset, in particular for roll cutting machines of the backup roller type.
  • the space requirement for the winding drive unit can be reduced particularly effectively by using a motor with the features of claim 2.
  • the Arrangement proposed according to claim 5 which, however, can also be used very advantageously regardless of the winding drive unit according to the invention, and also regardless of whether a center winding is taking place or whether only the backup roller is driven.
  • support arms or “support frames” are understood to mean any type of support elements which are suitable for carrying the roll to be wound up during the winding process in such a way that the roll to be wound up is rotatable and, preferably, on the support roller assigned to it is present.
  • Such support arms or support frames preferably have a possibility of subsequently placing the roll which has been wound up on the floor or on a means of transport.
  • Such support arms or support frames are widely known in winding devices and therefore do not have to be explained in more detail.
  • belt and “chain” are understood to mean any elongated transmission means which can be deflected along its longitudinal direction in a, preferably single, direction and, if appropriate, the corresponding opposite direction (180 °) by appropriately shaped deflection means.
  • a transmission means transmitting the rotary movement is provided between the driven wheel and the drive wheel of the winding drive unit according to the invention.
  • the transmission means can also be a gear train, such as a gear transmission, under certain circumstances.
  • “Circumferentially arranged traction means” are effective transmission means for driving forces in the sense of the invention, which can be deflected around deflection means in such a way that they can attack the carriage or carriage in essentially opposite directions.
  • the aforementioned transmission means such as belts or chains can also be used for this purpose, whereby - as with the transmission means - belts include flat, toothed, V-belts or similar belts as well as any type of ropes and comparable elements that can withstand tensile loads are.
  • This support roller can be part of a roller cutting machine of the support roller type which is known per se and is not specifically shown in the drawing which unwinds a wide web of paper or the like from a wide roll in a unwinding station, in a cutting station the wide web is longitudinally divided into at least two narrower partial webs, in two arranged on each side of the support roller 30 or more, in particular two, support rollers and the narrower partial webs are wound up from at least one take-up device 101 each.
  • a so-called roll-up frame, known per se, on which a carriage 11 is slidably mounted in straight guides 12 serves as the support frame 10 of the winding device 101.
  • the carriage 11 rotatably supports a drive wheel 13 which, for. B. formed as a V-belt pulley and on the roller 25 opposite side of the carriage 11 protrudes laterally from this.
  • the drive shaft 14 is rotatably inserted through the carriage 11 and carries on the roll 25 facing side of the carriage 11 a clamping head 15 (see FIG. 3), which in the open end of a winding tube 16 for the roll 25 to be wound up in a manner known per se is frictionally or positively clamped.
  • the roll-up frame 10 also carries a drive motor 17, which is a three-phase external rotor motor according to FIG. 5 in all the exemplary embodiments shown.
  • the rotor which represents a rotatable active drive part 18 of the drive motor, rotates around a stator 19 fixed to the support frame 10.
  • the outer diameter of the rotatable active drive part is - as large as the largest outer diameter of the entire engine.
  • the rotor (drive part 18) carries holders on its outer circumference, e.g. B. a circumferential flange 20 to which an annular element 21 is fastened, which together with the drive part 18 forms a driven wheel 22 usable as a V-belt pulley.
  • the driven wheel 22 of the drive motor 17 and the drive wheel 13 on the slide 11 lie in a common plane and are encircled by a rotating drive belt 23, which in this exemplary embodiment is designed as a V-belt, in the sense of a transmission.
  • a tensioning wheel 26, which can be displaced with its axis on the support frame 10, ensures the necessary tightness of the drive belt 23.
  • deflection elements 27 and 28 are provided on the support frame 10 as rotatably mounted rollers, which are also designed as V-belt pulleys are and are also in one plane with the drive wheel and the driven wheel. In this way, the winding drive unit can work in any position of the carriage 11 along the guide 12.
  • Further deflection elements 29 and 31 in the form of rollers or V-belt pulleys rotatably mounted on the carriage 11 allow the length of the drive belt 23 to be kept constant in every working position of the carriage 11, the angle of wrap of the drive belt 23 around the drive wheel 13 also remaining unchanged.
  • the function of the winding drive unit is now such that the winding process begins in the position of the carriage 11 shown in solid lines on the left in FIG. 1, in which the beginning of the partial web 24 to be wound up by looping and / or sticking or the like to the winding tube 16 is attached and the winding tube rests on the support roller 31.
  • the partial web 24 is now wound up, with the roll 25 already wound increasing continuously in diameter, so that the carriage 11 is shifted to the right in accordance with the increase in diameter (in the drawing) until he has reached the dash-dashed end position in which the roller 25 has reached its desired end diameter.
  • the carriage is displaced by means of deflection means 33 to 35 designed as rotatable rollers or gearwheels and a traction means 32 designed as a chain, which is arranged with one end above the guide 12 at an attachment point 38 of the carriage 11 and with its other end at one below the guide 12 Attachment point 39 of the carriage 11 engages the carriage 11 in the direction of pull. Due to the fastening points 38 and 39 located on both sides of the guide 12, the tilting moment exerted on the guide remains constant in both working directions.
  • a drive motor 37 is provided for driving the traction means 32 and a tensioning wheel 36 for tensioning the chain.
  • the carriage 11 With this drive arrangement, not only can the carriage 11 be moved or shifted exactly, and in particular coordinated with the increase in the diameter of the roller 25, but it is also possible to generate the contact pressure of the roller 25 on the support roller 30 which is desired in the respective carriage position and maintain.
  • the deflection means 33 to 35 are advantageously arranged coaxially to other shafts on the support frame 10.
  • the entire support frame 10 is mounted so as to be pivotable about a pivot axis 40 and by means of a piston / Cylinder arrangement 41 can be pivoted between these two positions.
  • the position of the support arm or support frame 10 changes in accordance with the increase in the diameter of the roll 25 to be wound.
  • the support arm or support frame 10 is in a manner known per se by means of a piston / cylinder arrangement 41 a Pivot axis 40 is pivotable, this pivot axis and this piston / cylinder arrangement also taking over the function of depositing the roller.
  • the piston / cylinder arrangement can also take on the task of applying or maintaining the contact pressure which is possibly desired between the roller 25 and the support roller 30.
  • the same reference numerals as in the exemplary embodiment according to FIGS. 1 to 3 have been used in the exemplary embodiment according to FIG. 4 for parts having the same effect.
  • a carriage 42 is provided, from which the entire support frame together with the piston / cylinder arrangement 41 is carried and arranged to be movable along stationary guides 54 with respect to the floor 43 in the direction of the support roller axis in order to pull out the clamping heads 15 from the To enable winding sleeves 16 of the roll 25 (which is of course also possible in principle with a fixed carriage 42) and, on the other hand, to enable rolls of different widths to be wound.
  • each winding device as a whole can be moved parallel to the support roller axis in order to create the space required for the roll change between adjacent winding devices.
  • the partial webs of a reel cutting machine to be wound can thus be as narrow as the width of the two assemblies 44 (FIG. 3) of a winding device arranged on both sides of the reel to be wound.

Landscapes

  • Replacement Of Web Rolls (AREA)
  • Winding Of Webs (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

Pour un dispositif de bobinage, destiné en particulier à des machines à découper à roulettes du type à cylindre d'appui, constitué par deux bras ou cadres porteurs (10) destinés à supporter un rouleau (25) à bobiner, un tendeur (15) pour chaque bras ou cadre porteur servant à maintenir chaque rouleau (25) de manière qu'il soit centré et mobile autour d'un axe et au moins un système d'entraînement pour chaque installation de bobinage (101, 102), avec lequel l'axe d'entraînement (45) d'un moteur (17) du système d'entraînement est décalé par rapport à l'axe de bobinage (46) du rouleau (25), on produit une amélioration de l'entraînement central de l'arbre de bobinage par le fait que le moteur d'entraînement (17), dont l'axe d'entraînement (45) est parallèle à l'axe de bobinage (46) du rouleau (25), est fixé sur le bras ou le cadre porteur (10) et comporte une roue réceptrice (22), qu'une courroie (courroie d'entraînement (23)), par exemple une courroie plate, crantée ou trapézoïdale, un câble ou similaire ou une chaîne ou similaire, ainsi qu'une roue motrice (13) reliée au tendeur (15) dans le sens de l'entraînement, sont prévues de préférence sur un arbre unique (arbre moteur (14)) et que la courroie ou la chaîne (courroie d'entraînement (23)) entoure la roue réceptrice (22) (et la roue motrice (13)) de telle manière que la roue motrice (13) soit entraînée par la roue réceptrice (22) dans le sens de la rotation et que le diamètre (agissant sur l'entraînement) de la roue réceptrice (22) soit supérieur à au moins une partie des éléments d'entraînement actifs (18) du moteur d'entraînement (17) et englobe cet élément d'entraînement sur une partie au moins de la longueur axiale de celui-ci.

Claims (5)

  1. Dispositif de bobinage, en particulier pour machines trancheuses à roulettes, du type à rouleau d'appui, sur lesquelles au moins une bobine large d'une bande de papier ou similaire peut être découpée chaque fois en plusieurs bobines (25) plus étroites et qui sont équipées, de préférence d'une station de déroulage pour au moins une bobine large, d'une station de tranchage pour découper longitudinalement la bande et de deux stations de bobinage comportant chacune au moins un dispositif de bobinage, les deux stations de bobinage étant disposées des deux côtés d'un rouleau d'appui unique, ou de plusieurs rouleaux d'appui, en particulier de deux rouleaux d'appui (30), pour lesquels au moins un dispositif de bobinage (101; 102) est prévu et est constitué d'au moins
       chaque fois deux bras supports ou berceaux supports (10), portant une bobine (25) à enrouler pendant l'opération de bobinage,
       chaque fois une tête de serrage (15) par bras support ou berceau support, pour maintenir centré et tournant chaque bobine (25), et
       au moins une unité entraînant le bobinage pour chaque dispositif de bobinage (101; 102),
       étant entendu que l'axe d'entraînement (45) d'un moteur d'entraînement (17) de l'unité entraînant le bobinage est disposé décalé par rapport à l'axe de bobinage (46) de la bobine (25) et que la bobine (25) à enrouler change de position pendant l'opération de bobinage, caractérisé
       en ce que le moteur d'entraînement (17), avec son axe d'entraînement (45), est disposé et fixé sur le bras support ou berceau support (10), parallèlement à l'axe de bobinage (46) de la bobine (25) à enrouler et présente une roue de sortie (22),
       en ce qu'une courroie (23), sous la forme d'une courroie plate, d'une courroie crantée, d'une courroie trapézoïdale, d'un câble ou similaire, ou d'une chaîne ou similaire, ainsi qu'une roue d'entraînement (13), reliée à la tête de serrage (15) en vue de son entraînement, sont prévus, de préférence sur un arbre unique (14), et en ce que la courroie (23) ou la chaîne passe autour de la roue entraînée (22) et de la roue d'entraînement (13), de telle façon que la roue d'entraînement (13) peut être entraînée par la roue entraînée (22) dans me sens de rotation, et
       en ce que le diamètre d'entraînement de la roue entraînée (22) est plus grand qu'au moins une partie des pièces d'entraînement actives (18) du moteur d'entraînement (17) et en ce que cette pièce d'entraînement active s'étend sur au moins une partie de sa longueur axiale.
  2. Dispositif de bobinage suivant la revendication 1, caractérisé en ce que la pièce d'entraînement active (18), pouvant tourner en fonctionnement, présente un diamètre extérieur qui est au moins sensiblement aussi grand ou plus grand que le plus grand diamètre extérieur du moteur d'entraînement (17), en particulier en ce que le moteur d'entraînement est un moteur à courant alternatif à rotor externe ou un moteur à courant continu à entrefer plat.
  3. Dispositif de bobinage suivant la revendication 1 ou la revendication 2, caractérisé en ce que les bras supports ou berceaux supports (10), comme cela est connu, présentent des guides (12) pour faire déplacer ou coulisser de façon guidée un chariot ou un traîneau (11) portant la bobine (25) à enrouler, en fonction de l'augmentation du diamètre de la bobine pendant l'opération de bobinage,
       en ce que la roue d'entraînement (13) est disposée sur au moins l'un des chariots ou traîneaux (11) d'un dispositif de bobinage (101), et
       en ce que les organes de renvoi (27, 28) de la courroie (23) ou de la chaîne sont disposés sur au moins un des bras supports ou berceaux supports (10) de telle façon que la force d'entraînement, dans chacune des positions du chariot ou du traîneau (11) requises pour l'opération d'enroulement par rapport au bras support ou berceau support (10), puisse être transmise à la roue d'entraînement (13).
  4. Dispositif de bobinage suivant la revendication 3, caractérisé en ce que, sur le chariot ou sur le traîneau, aussi bien du côté du brin de la courroie (23) ou de la chaîne, qui y arrive, que du côté du brin qui en part, un autre organe de renvoi (29, 31) est disposé de telle façon, par rapport à la roue d'entraînement (13), qu'il règne sur la roue d'entraînement (13), dans chacune des positions du chariot ou du traîneau (11) par rapport au bras support ou berceau support (10), les mêmes conditions en ce qui concerne la longueur et l'angle de l'enroulement.
  5. Dispositif de bobinage suivant la revendication 3 ou la revendication 4, caractérisé par un moyen de traction (32) tournant, comme par exemple une chaîne, agissant sur le chariot ou le traîneau (11) et disposé sur au moins un bras support ou berceau support (10) pour chaque dispositif de bobinage (101), pour réaliser une pression en ligne entre la bobine à enrouler et au moins l'un des rouleaux d'appui (30) pendant l'opération de bobinage, ou bien pour déplacer ou faire coulisser le bras support ou berceau support (10), ou pour faire les deux.
EP90912625A 1990-06-08 1990-08-28 Dispositif de bobinage pour machines a decouper a roulettes du type a cylindre d'appui ou similaire Expired - Lifetime EP0534959B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90912625T ATE101581T1 (de) 1990-06-08 1990-08-28 Aufwickelvorrichtung fuer rollenschneidemaschinen des stuetzwalzentyps od. dgl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4018314 1990-06-08
DE4018314 1990-06-08

Publications (2)

Publication Number Publication Date
EP0534959A1 EP0534959A1 (fr) 1993-04-07
EP0534959B1 true EP0534959B1 (fr) 1994-02-16

Family

ID=6407998

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90912625A Expired - Lifetime EP0534959B1 (fr) 1990-06-08 1990-08-28 Dispositif de bobinage pour machines a decouper a roulettes du type a cylindre d'appui ou similaire

Country Status (11)

Country Link
US (1) US5377931A (fr)
EP (1) EP0534959B1 (fr)
JP (1) JPH07110728B2 (fr)
AU (1) AU6270790A (fr)
BR (1) BR9008028A (fr)
CA (1) CA2084785C (fr)
DE (1) DE59004647D1 (fr)
FI (1) FI101527B (fr)
PL (1) PL166992B1 (fr)
RU (1) RU2060219C1 (fr)
WO (1) WO1991018813A1 (fr)

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US5713534A (en) * 1995-06-22 1998-02-03 Imd Corporation Continuous web winding apparatus
US5664737A (en) * 1995-10-10 1997-09-09 Beloit Technologies, Inc. Centerwind assist for a paper winder system
FI110259B (fi) * 1998-05-07 2002-12-31 Metso Paper Inc Menetelmä ja laite rullan kuormittamiseksi rainan rullaimessa
FI110424B (fi) 1998-06-18 2003-01-31 Metso Paper Inc Rullain ja menetelmä rainan rullaamiseksi
US6283402B1 (en) * 1999-06-17 2001-09-04 Ashe Controls, Ltd. Rewinder method and apparatus
US6669818B2 (en) * 2000-06-28 2003-12-30 Metso Paper Karlstad Ab Shortened layout from dryer to reel in tissue machine
US6749723B2 (en) * 2000-06-28 2004-06-15 Metso Paper Karlstad Ab Measuring arrangements in a shortened dry end of a tissue machine
FI116217B (fi) * 2001-08-27 2005-10-14 Metso Paper Inc Menetelmä rullan siirtämiseksi ja rullain
US20080223975A1 (en) * 2007-03-14 2008-09-18 Miroslav Planeta Reversible surface winder
US7476111B2 (en) * 2007-05-17 2009-01-13 United Technologies Corporation Two-plug electrical outlet with dual voltage
CH705791A1 (de) * 2011-11-21 2013-05-31 Swiss Winding Inventing Ag Verfahren zur Herstellung eines Wickels aus einer Materialbahn von flexiblem Material, sowie Wickler zur Ausführung dieses Verfahrens.
CN104150253B (zh) * 2014-07-11 2016-08-24 青岛铠硕机械科技有限公司 丝绒布卷布装置
CA2983710C (fr) * 2015-05-05 2023-08-29 Amut S.P.A. Machine et procede pour produire des bobines de film etirable
DE102018008127B4 (de) 2018-10-13 2022-06-09 Hosokawa Alpine Aktiengesellschaft Blaskopf und Verfahren zur Herstellung einer Mehrschichtschlauchfolie
DE102018009632B4 (de) 2018-12-11 2021-12-09 Hosokawa Alpine Aktiengesellschaft Vorrichtung zum Aufwickeln und Wickelwechsel von bahnförmigem Material und ein Verfahren dafür
CN114291663A (zh) * 2021-12-31 2022-04-08 惠州市赢合科技有限公司 一种收放卷机构

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0365912A2 (fr) * 1988-10-24 1990-05-02 WindmÀ¶ller & Hölscher Dispositif d'enroulage de bandes sur des mandrins

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FR1445685A (fr) * 1965-06-03 1966-07-15 C I P S O Perfectionnement aux dispositifs d'enroulage de bandes étroites obtenues par découpge d'une bande plus large
US3350026A (en) * 1966-03-15 1967-10-31 Du Pont Web slitting and rewind machine
US3433429A (en) * 1967-04-10 1969-03-18 Midland Ross Corp Film winding apparatus
JPS60142255U (ja) * 1983-08-29 1985-09-20 株式会社　片岡機械製作所 帯状シ−ト裁ち屑の巻取装置
DE3800703A1 (de) * 1988-01-13 1989-08-03 Beloit Corp Vorrichtung zum aufwickeln von bahnen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0365912A2 (fr) * 1988-10-24 1990-05-02 WindmÀ¶ller & Hölscher Dispositif d'enroulage de bandes sur des mandrins

Also Published As

Publication number Publication date
PL290571A1 (en) 1991-12-16
CA2084785A1 (fr) 1991-12-09
JPH07110728B2 (ja) 1995-11-29
CA2084785C (fr) 1999-06-29
PL166992B1 (pl) 1995-07-31
FI101527B1 (fi) 1998-07-15
RU2060219C1 (ru) 1996-05-20
DE59004647D1 (de) 1994-03-24
AU6270790A (en) 1991-12-31
FI925548A0 (fi) 1992-12-07
FI101527B (fi) 1998-07-15
BR9008028A (pt) 1993-04-27
FI925548A (fi) 1992-12-07
EP0534959A1 (fr) 1993-04-07
JPH06500298A (ja) 1994-01-13
WO1991018813A1 (fr) 1991-12-12
US5377931A (en) 1995-01-03

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