EP0439810B2 - Procédé et dispositif pour le démarrage et l'achèvement du bobinage automatique d'un fil métallique sur des bobines. - Google Patents

Procédé et dispositif pour le démarrage et l'achèvement du bobinage automatique d'un fil métallique sur des bobines. Download PDF

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Publication number
EP0439810B2
EP0439810B2 EP90125227A EP90125227A EP0439810B2 EP 0439810 B2 EP0439810 B2 EP 0439810B2 EP 90125227 A EP90125227 A EP 90125227A EP 90125227 A EP90125227 A EP 90125227A EP 0439810 B2 EP0439810 B2 EP 0439810B2
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EP
European Patent Office
Prior art keywords
wire
unit
reel
winding
gripper
Prior art date
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Expired - Lifetime
Application number
EP90125227A
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German (de)
English (en)
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EP0439810A1 (fr
EP0439810B1 (fr
Inventor
Giuseppe Graziutti
Carlo Placereani
Giancarlo Saro
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Impianti Industriali SpA
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Impianti Industriali SpA
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/24—Transferring coils to or from winding apparatus or to or from operative position therein; Preventing uncoiling during transfer
    • B21C47/245—Devices for the replacement of full reels by empty reels or vice versa, without considerable loss of time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/02—Winding-up or coiling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/24—Transferring coils to or from winding apparatus or to or from operative position therein; Preventing uncoiling during transfer

Definitions

  • This invention concerns a method for the start-up and ending of the winding of metallic wire and a relative device.
  • the invention concerns devices fitted to machines that wind metallic wire, and suitable to make fully automatic the steps of start-up and ending of the winding of the metallic wire on reels in the process.
  • the automatic devices of the invention can advantageously cooperate directly with plants which draw or roll metallic wire with a hot or cold process.
  • wire in this invention is to be understood as being used in its widest meaning to cover products having a round, oval, three-lobed. square, rectangular. hexagonal, etc. section.
  • the invention can also be employed with other wire materials having suitable characteristics.
  • the state of the art covers the problems linked to the winding of metallic wire on reels. This operation is carried out on winding machines which are usually connected to upstream machines that feed the wire. These winding machines include a wire-guide device that distributes the wire in layers on reels set in rotation on suitable headstocks.
  • the reel is halted and the wire has to be sheared so that the full reel can be removed.
  • the end of the wire wound on the reel has to be suitably positioned thereon so that it can be retained, whereas the other end of the wire has to be suitably positioned on an empty reel so that a new winding operation can be started.
  • US-A-3,994,058 discloses a device and a method according to the preambles of claims 5 and 1 respectively, which has the purpose of shaping the end of the wire so that that end can be fixed automatically to a reel.
  • the device provides for a reel of small dimensions with a horizontal axis of the type, for instance, used for reels of copper wire or thin wire.
  • the reel is set in rotation by lateral plates. This is a technology already known in the field of the winding of wires of small diameter and has the purpose only of operating in the initial prewinding step.
  • VWS300 which embodies the features of the pre-characterizing part of Claim 5, and the use of which corresponds to the method according to the preamble of Claim 1.
  • the present applicant has the purpose of over coming the problems of the state of the art by providing a method and a device for the start-up and ending of the winding of metallic wire, whereby the winding itself is made fully automatic.
  • the device according to the invention consists of a series of operational units able to cooperate with a wire-guide device according to required sequences which can be and are pre-set.
  • the wire-guide device is capable not only of the usual straight traversing movement to lay the wire on the reel but also of a transfer movement to be positioned in relation to the operational units with which it has to cooperate momentarily.
  • the wire-guide device also contains means suitable to carry out the automatic operations for the start-up and ending of the winding.
  • the feed of metallic wire is halted automatically and, if so required, the wire-guide transfers the yarn and clamps it in a required position.
  • a positioner unit too takes part in this operation and acts as a guide and control of the segment of wire in question, namely the segment between the reel and the wire-guide.
  • the positioner unit brings this segment of wire to a substantially straight position so as to cooperate with the operational units arranged between the positioner unit and the wire-guide.
  • These operational units include a gripper unit, a bending unit and a shears unit arranged cascade-wise from the positioner unit onwards towards the wire-guide.
  • the shears unit has the task of shearing the wire, while the bending unit has the task of conforming in a required manner the sheared end of the wire belonging to the package on the reel and the gripper unit has the task of clamping the wire during the above operations.
  • the gripper unit is capable of a motion suitable to transfer the bent end of the wire onto a device able to retain the wire on each reel.
  • the packaged reel is discharged automatically or is brought to a discharge position, while an empty reel is brought to the position for winding.
  • the wire-guide device which has retained the end of the wire arriving from the feed apparatus located upstream of the winding machine, is now brought into cooperation with a wire inserter unit that has the task of positioning the wire in a required manner on the empty reel so that a new winding operation can be started.
  • the end of the wire being fed is brought to a clamping means borne on the reel actuation unit in the vicinity of the central cylindrical body of the reel and is retained in that clamping means.
  • That end of the wire is suitably released thereafter from the clamping means when the winding operation has begun.
  • the start-up of winding is brought about automatically when the wire-guide device, which has always kept contact with the wire being fed during the above operations, is brought back to the position arranged for the start-up of winding onto the reel.
  • a winding machine 10 comprises the normal means to support and actuate a reel 11 being packaged, such as a headstock and tailstock 12, actuation motor 13, a drive plate 14 to draw the reel 11, a platform 15 which in this case has three working positions, means 16 to rotate the platform and other means which belong to the state of the art.
  • a wire-guide device 17 can be moved vertically according to the arrows 18 by means of first sliders 19, which cooperate with vertical guides 20 borne on a movable turret 21, which is equipped with controls for the working of the wire-guide device 17.
  • the turret 21 can be moved with a straight motion in a direction according to the arrows 22 at a right angle to the direction 18 of the wire-guide device 17 by means of second sliders 23 cooperating with horizontal guides 24.
  • the turret 21 in its righthand position shown in Figs.1 to 3 is in the operational step corresponding to the end of winding a package of wire on the reel 11.
  • the winding position during the take-up of wire on the reel 11 can coincide with one of the intermediate positions between the righthand and lefthand positions described above, which have been indicated merely as examples and may be different according to different design parameters.
  • a metallic wire 25 being fed is shown as cooperating with the wire-guide device 17, which comprises essentially a pair of guide rolls 26 to guide the wire 25 and a gripper device 27 to grip the wire 25.
  • Figs.5 and 6 show an embodiment of the wire-guide device 17 wherein it is possible to see that the gripper device 27 consists of a movable gripper element 28 actuated by a jack 29 and a stationary abutment element, which may be a gripper roll 30 for instance.
  • Figs.5 and 6 the gripper device 27 is shown in its closed condition during clamping of the wire 25, as happens substantially during the ending of winding and the traversing of the turret 21.
  • a positioner unit to position the wire 25 is referenced with 31 and is located advantageously in the vicinity of the reel 11 and, at the end of winding, has the task of bringing the wire 25 to a position suitable for cooperation with other units which will be described hereinafter.
  • the positioner unit 31 consists preferably of a fork 32 (shown with lines of dashes in its inactive position in Fig.7) rendered movable so that it can be positioned astride the wire and can drag the wire to a required position.
  • the motion of the fork 32 is an oscillatory motion actuated by a first jack 34 about a first pivot 33 and an oscillatory motion actuated by a second jack 37 about a second pivot 36 together with a lever 35.
  • the positioner unit 31 is connected to a suitable support structure 38 secured to the frame of the winding machine 10.
  • a gripper unit 39 is located in a position substantially superimposed on the positioner unit 31 and is shown only diagrammatically in Fig.1 and in detail in Figs.9 and 10 in a preferred embodiment.
  • the fork 32 of the positioner unit 31 in its position to engage the wire 25 clasps both sides of the gripper unit 39 at the level of the grippers 40 so as to move the wire 25 between the grippers 40.
  • the gripper unit 39 is aligned with the wire-guide device 17, thus obtaining a substantially straight segment of wire 25.
  • the grippers 40 of the gripper unit 39 consist of a stationary element 140 and a movable element 240, which can be rotated about a pivot 41 by a small piston/cylinder actuator 42.
  • the grippers 40 are installed on a column 43 connected to a stationary support 44 borne on the frame of the winding machine 10.
  • the column 43 can rotate in relation to the stationary support 44 in the manner and for the reasons which will be explained later.
  • a bending unit 45 is positioned immediately upstream of the gripper unit 39 in the direction of feed of the wire 25 and is aligned with the gripper unit 39.
  • This bending unit 45 consists of a bending roller 46 fitted eccentrically on a rotary support 47 and of an opposed roller 48; the method of working of the unit 45 is well known in the state of the art.
  • the rotary support 47 is rotated by a suitable motor 49, and the rotation enables the end of the wire 25, sheared beforehand as we shall explain, to be conformed in a required profile, U-shaped for instance.
  • a shears unit 50 which in this case is of the type shown in Fig.12, is included upstream of the bending unit 45 and aligned therewith.
  • the shears unit 50 is arranged vertically and comprises a stationary blade 51 and a movable blade 52 actuated by its own actuator means 53 so as to shear the wire 25 positioned between the blades 51-52.
  • the shearing is carried out while the wire 25 is held in the gripper device 27 of the wire-guide device 17 and in the gripper unit 39.
  • the bending unit 45 is actuated, as we said earlier, to conform the sheared end of the wire 25 wound on the packaged reel.
  • the gripper unit 39 takes action once more to take the suitably conformed sheared end of the wire 25 to a pre-set position near the reel 11. This is achieved by rotation of the column 43 according to the arrows 54, the column 43 being solidly fixed to a movable element consisting of a pair of connection plates 55 coupled by a vertical segment 47; the movable element can be rotated about a pivot 57 by means of its own hub 73.
  • Rotation according to the arrows 54 is achieved by actuation of a jack 56, which causes rotation (see the position, shown with lines of dashes, of the jack 56 in Fig.9) of the movable element about the pivot 57.
  • the end of the wire 25 can be engaged advantageously on an appropriate support included on the reel 11 at the time when the headstock and tailstock 12 of the winding machine 10 are withdrawn from the reel 11.
  • the reel 11 carries out a downward vertical travel so as to rest on the platform 15 and can engage the end of the wire 25 automatically in this way.
  • the inserter unit 58 is shown diagrammatically in Fig.4 in its inactive position (with continuous lines) and in its introduction position (with lines of dashes) while it is shown in detail in Fig.13.
  • the inserter unit 58 comprises a stationary base 60, on which is pivoted a first lever 61 actuated by its jack 62 so as to rotate about a pivot 63.
  • a second lever 65 is pivoted at 64 on the first lever 61 and is secured to the insertion gripper 59.
  • the second lever 65 is rotated about the pivot 64 by a jack 66 secured to the first lever 61.
  • Fig.13 shows with lines of dashes the position taken up by the inserter unit 58 during operations. Such operations bring the end of the wire 25 to the reel 11, for instance in a clamp 67 borne on the drive plate 14 and arranged on the upper flange 68 in correspondence with the central cylindrical body of the reel 11.
  • the clamp 67 may be of a type shown in a vertical section in Fig.14, which shows jaws 69 that can be actuated laterally by means of rams 70 and a central return spring 71 when the jaws 69 are to be opened.
  • the clamp 67 is actuated when the end of the wire 25 is inserted between the jaws 69 by the inserter unit 58; thereafter the clamp 67 keeps the wire 25 clamped during the first step of winding a required number of coils of wire onthe reel 11.
  • the clamp 67 can be opened thereafter at a required time, which in any case will be earlier than the start-up of the operations to end winding of the wire 25 on the reel 11.
  • the winding machine 10 of the invention is suitably equipped with appropriate devices to actuate and control the operational steps of the automatic cycle; this equipment can be governed advantageously by a computerized system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
  • Ropes Or Cables (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Basic Packing Technique (AREA)

Claims (11)

  1. Procédé pour lancer et terminer automatiquement le bobinage de fil métallique sur une bobine, l'axe de la bobine (11) étant orienté essentiellement à la verticale, ladite bobine présentant un corps sur lequel le fil est enroulé et qui est délimité par une bride supérieure et une bride inférieure, le procédé comportant l'utilisation d'une machine de bobinage comprenant un moyen pour amener le fil sur la bobine (11), un moyen pour délivrer l'extrémité de tête du fil (25) à enrouler sur la bobine (11) et pour attacher l'extrémité du fil (25) à la bobine (11), un moyen (17) de guidage du fil comprenant des rouleaux de guidage (26) et pouvant être déplacé de manière continue et contrôlée pour guider le fil (25) pendant le bobinage, tandis que, lorsque le bobinage est terminé, le moyen (17) de guidage du fil, en coopération avec une unité de saisie (39) située entre la bobine (11) et le moyen (17) de guidage du fil, aligne le fil (25) et le saisit en deux emplacements, le fil (25) étant ensuite cisaillé par une unité de cisaillage (50) entre les deux emplacements par lesquels le fil (25) est saisi, l'extrémité de tête et l'extrémité de queue du fil (25) restant saisies pendant que l'extrémité de queue est pliée en forme de crochet au moyen d'une unité de pliage (45), le procédé étant caractérisé en ce que, lorsque le bobinage d'une bobine (11) vide est lancé, l'extrémité de tête du fil (25) provenant du moyen (17) de guidage du fil est délivrée à un dispositif de saisie d'insertion (59) d'une unité d'insertion (58) qui présente une position inactive et une position d'insertion, l'unité d'insertion (58) insérant l'extrémité de tête du fil (25) dans une pince (67) associée à la bride supérieure (68), le moyen (17) de guidage du fil étant ensuite amené dans la position de bobinage du fil (25) sur la bobine (11), le procédé étant également caractérisé en ce que, lorsque le bobinage est terminé, le fil (25) est situé entre le moyen (17) de guidage du fil et la tangente au fil enroulé sur le corps de la bobine (11), le dispositif (17) de guidage du fil étant mis en position haute et le fil (25) étant aligné sur l'unité de saisie (39) en étant engagé par une unité de positionnement (31) qui tire le fil (25) vers l'intérieur entre les dispositifs de saisie (40) de l'unité de saisie (39) pour saisir le fil (25) en un premier desdits deux emplacements, l'unité de positionnement (31) positionnant de cette manière et simultanément le fil (25) dans l'unité de cisaillage (50) et dans l'unité de pliage (45), l'unité de saisie (39) positionnant l'extrémité de queue en forme de crochet du fil (25) dans une position qui permet d'accrocher le fil (25) sur la bobine (11), et en ce que le moyen (17) de guidage du fil comprend des moyens de saisie (27) et qui saisissent le fil (25) avant et pendant le cisaillage sur le deuxième desdits deux emplacements.
  2. Procédé selon la revendication 1, dans lequel la partie en forme de crochet de l'extrémité de queue du fil bobiné est accrochée sur la bobine (11) en abaissant la bobine (11) en vue de son déchargement sur une plate-forme de déchargement (15).
  3. Procédé selon la revendication 1 ou 2, comprenant les étapes suivantes en plus de l'étape de démarrage du bobinage : une bobine vide (11) est insérée dans la machine de bobinage dans une position abaissée, l'extrémité de tête du fil (25), les rouleaux de guidage et le moyen de saisie (27) sont déplacés depuis la position de la fin du bobinage jusque dans la position du départ du bobinage et délivrent l'extrémité de tête du fil (25) à l'unité d'insertion (58) qui, au moyen du dispositif de saisie d'insertion (59), délivre l'extrémité de tête à la pince (67), et la bobine vide (11) est ensuite relevée vers sa position de bobinage avant que le bobinage soit lancé.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel, avant le lancement de l'étape de bobinage, la bobine est tournée de manière contrôlée pour bobiner un nombre voulu de tours, et l'extrémité de tête du fil (25) est alors libérée par la pince (67).
  5. Dispositif pour lancer et terminer automatiquement le bobinage de fil métallique, le dispositif étant inclus dans une machine pour le bobinage de fil métallique (25) sur une bobine (11), la machine comprenant un moyen pour amener le fil (25) vers la bobine (11), une unité de cisaillage (50), un moyen (58) pour délivrer l'extrémité de tête du fil (25) à bobiner sur la bobine (11) et pour l'attacher à la bobine (11), un moyen de saisie (27) et un moyen (17) de guidage du fil qui peut être déplacé de manière continue et contrôlée pour guider le fil (25) pendant le bobinage, le moyen (17) de guidage du fil comprenant des rouleaux de guidage (26), la bobine (11) présentant un axe essentiellement vertical, une plaque supérieure d'entraínement (14) et une poupée mobile (12) inférieure et pouvant être déplacée entre une position haute de travail et une position basse dans laquelle la bobine (11) peut être chargée dans la machine ou en être déchargée, le dispositif comprenant en outre :
    une unité de saisie (39) pour saisir le fil (25) lorsque le moyen (17) de guidage du fil est placé en alignement sur l'unité de saisie (39),
    une unité de pliage (45) pour plier l'extrémité de queue du fil découpé (25) étant maintenue par l'unité de saisie (39),
    dans lequel le moyen (17) de guidage du fil peut être déplacé verticalement au moins sur la hauteur de bobinage, et dans lequel l'unité de cisaillage (50) est en mesure de couper le fil (25) qui est en même temps saisi par l'unité de saisie (39) et les moyens de saisie (27), le dispositif étant caractérisé en ce qu'une unité de positionnement (31) est prévue pour introduire le fil (25) entre les dispositifs de saisie (40) de l'unité de saisie (39), en ce qu'une pince (67) est attachée à la bobine (11), la pince (67) étant adaptée pour permettre l'insertion de l'extrémité de tête du fil (25) à bobiner, en ce que les moyens de saisie (27) sont inclus dans un ensemble formé avec les rouleaux de guidage (26), et en ce que le déplacement vertical du moyen (17) de guidage du fil s'effectue le long d'une tourelle mobile (21).
  6. Dispositif selon la revendication 5, dans lequel les moyens d'insertion (58) comportent une pince d'insertion (59) capable de se déplacer d'une position inactive vers une position dans laquelle la pince d'insertion (59) peut accrocher le fil (25) maintenu dans les moyens (17) de guidage du fil, et depuis cette position, la pince d'insertion (59) peut être déplacée en une position dans laquelle le fil (25) est inséré dans une pince (67).
  7. Dispositif selon la revendication 5 ou 6, dans lequel l'unité de positionnement (31) comporte une fourche (32) reliée à rotation à un levier (35) qui est fixé à rotation au châssis de la machine de bobinage (10), des moyens (34-37) pour actionner une oscillation étant compris, et étant capables de faire tourner la fourche (32) par rapport au levier (35), et le levier (35) par rapport au châssis de la machine de bobinage (10).
  8. Dispositif selon l'une quelconque des revendications 5 à 7 incluses, dans lequel l'unité de pinçage (39) est constituée d'un support stationnaire (44) et d'une colonne mobile (43) sur laquelle sont installées des pinces (40), la colonne mobile (43) étant capable de tourner (54) par rapport au support stationnaire (44), les pinces (40) comportant des moyens (140-240) qui peuvent être déplacés l'un par rapport à l'autre (42).
  9. Dispositif selon l'une quelconque des revendications 5 à 8 incluses, dans lequel l'unité de pliage (45) est constituée d'un galet de pliage (46) et d'un galet opposé (48), le galet de pliage (46) étant installé en position excentrique sur un support rotatif (47) comportant son propre moteur (49).
  10. Dispositif selon l'une quelconque des revendications 5 à 9 incluses, dans lequel l'unité d'insertion (58) comporte une pince d'insertion (59) en même temps qu'un second levier (65) installé à rotation sur un premier levier (61), lui-même installé à rotation sur une base stationnaire (60), des moyens (62-66) pour actionner l'oscillation étant inclus et capables de faire tourner la pince d'insertion (59) par rapport au premier levier (61), et de faire tourner le premier levier (61) par rapport à la base stationnaire (60).
  11. Dispositif selon l'une quelconque des revendications 5 à 10 incluses, dans lequel le plateau supérieur d'entraínement (14) porte une pince (67) pour retenir le fil (25), cette pince (67) pouvant être désactivée.
EP90125227A 1990-01-31 1990-12-21 Procédé et dispositif pour le démarrage et l'achèvement du bobinage automatique d'un fil métallique sur des bobines. Expired - Lifetime EP0439810B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8332090 1990-01-31
IT83320A IT1238983B (it) 1990-01-31 1990-01-31 Automatismo di avvio e fine bobinatura per fili metallici

Publications (3)

Publication Number Publication Date
EP0439810A1 EP0439810A1 (fr) 1991-08-07
EP0439810B1 EP0439810B1 (fr) 1994-11-30
EP0439810B2 true EP0439810B2 (fr) 2001-06-13

Family

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Application Number Title Priority Date Filing Date
EP90125227A Expired - Lifetime EP0439810B2 (fr) 1990-01-31 1990-12-21 Procédé et dispositif pour le démarrage et l'achèvement du bobinage automatique d'un fil métallique sur des bobines.

Country Status (4)

Country Link
EP (1) EP0439810B2 (fr)
AT (1) ATE114517T1 (fr)
DE (2) DE69014586T3 (fr)
IT (1) IT1238983B (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2476284C1 (ru) * 2011-09-16 2013-02-27 Открытое акционерное общество "Электростальский завод тяжелого машиностроения" Установка для снятия рулонов с накопителя и установки их на разматыватель

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1152698A (en) * 1966-05-27 1969-05-21 Vnii Pk I Metall Maschino Continuous Coiler for Long Lengths of Stock Such as Wire
JPS5517655B2 (fr) * 1974-02-25 1980-05-13
IT1195482B (it) * 1983-11-18 1988-10-19 Meccanica Di Precisione Spa Robot programmabile in grado di gestire l alimentazione e lo scarico rispettivamente delle bobine vuote e delle bobine piene in e da macchine adibite alla bobinatura di fili metallici e o d altro materiale a venti caratteristiche operative u guali o diverse ed allineate su un lato della guida lungo la quale scorre lo stesso robot di cui trat

Also Published As

Publication number Publication date
DE69014586D1 (de) 1995-01-12
EP0439810A1 (fr) 1991-08-07
DE69014586T2 (de) 1995-05-04
DE439810T1 (de) 1992-02-06
IT9083320A0 (it) 1990-01-31
EP0439810B1 (fr) 1994-11-30
IT9083320A1 (it) 1991-08-01
ATE114517T1 (de) 1994-12-15
IT1238983B (it) 1993-09-17
DE69014586T3 (de) 2001-09-06

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