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WO1989008071A1 - Bobinoir - Google Patents

Bobinoir Download PDF

Info

Publication number
WO1989008071A1
WO1989008071A1 PCT/DE1989/000122 DE8900122W WO8908071A1 WO 1989008071 A1 WO1989008071 A1 WO 1989008071A1 DE 8900122 W DE8900122 W DE 8900122W WO 8908071 A1 WO8908071 A1 WO 8908071A1
Authority
WO
WIPO (PCT)
Prior art keywords
winding
brake
winding device
spool
centering plate
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.)
Ceased
Application number
PCT/DE1989/000122
Other languages
German (de)
English (en)
Inventor
Peter Dammann
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.)
Oerlikon Barmag AG
Original Assignee
Barmag AG
Barmag Barmer Maschinenfabrik AG
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 Barmag AG, Barmag Barmer Maschinenfabrik AG filed Critical Barmag AG
Publication of WO1989008071A1 publication Critical patent/WO1989008071A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/40—Arrangements for rotating packages
    • B65H54/54—Arrangements for supporting cores or formers at winding stations; Securing cores or formers to driving members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/036—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the combination of the detecting or sensing elements with other devices, e.g. stopping devices for material advancing or winding mechanism
    • B65H63/0364—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the combination of the detecting or sensing elements with other devices, e.g. stopping devices for material advancing or winding mechanism by lifting or raising the package away from the driving roller
    • B65H63/0366—Braking means for the raised or lifted package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a winding device according to the preamble of claim 1.
  • This winding device is e.g. known from P 38 02 434.9 (Bag. IP-1563).
  • the winding spindle which is used for the rotatable clamping of the winding tube, is formed by two coaxial centering plates which are freely rotatably mounted coaxially to one another at the free ends of the arms of a U-shaped coil lever and between which the winding tube is clamped non-positively under axial spring force is.
  • the brake device acts on at least one of the centering plates.
  • a further sleeve tensioning device suitable for further development by the invention in which the spool sleeve, which is in the slid-on state against a bearing-side stop of a cantilevered shaft, which stop preferably centers it by means of a centering attachment, can be clamped on the shaft by two clamping rings, in DE PS.31 34 294 (Bag. 1211).
  • the bobbin After the winding process has ended and the drive has been switched off, for example after being lifted off the drive roller, the bobbin must first be braked to a standstill before it can be removed from the winding spindle. So far, this has been done by gently braking the winding spindle while avoiding slippage between the winding spindle and the sleeve. The wear of the brake is inevitable, so that the wear parts must be replaced from time to time. Furthermore, a control or regulation is necessary for the automatic operation of the brake so that the coil is brought to a standstill as quickly as possible by applying an optimal braking force.
  • the invention is therefore based on the object of designing the braking device in such a way that wear occurs on parts which are simple to replace and cheap and that, after a single adjustment without further control or regulation, the same optimal braking force can always be exerted with each braking operation .
  • This object is solved by claim 1.
  • the brake device has two brake pairs. The first, a pair of surfaces, is under constant spring force, which enables the transfer of a non-positive moment, and concentrically rotates with the winding tube and the winding spindle.
  • the second brake pairing consists of a stationary locking device and the brake body, which comprises the braking surface of the first brake pairing which is more distant from the winding sleeve; the braking torque which can be exerted by the second brake pairing is generally greater than the torque of the first brake pairing.
  • the locking device of the second brake pairing can be both non-positive and positive.
  • the first brake pair rotating concentrically with the winding spindle is always non-positive.
  • the braking force can be adjusted to its optimum value once and for all by dimensioning the force which brings about this adhesion, which is preferably spring force.
  • the second brake pairing has on the one hand a stationary locking device and on the other hand a brake body cooperating therewith, on which at the same time a braking surface of the first brake pair is seated.
  • the braking effect of this second pair of brakes can be both non-positive and positive. In any case, however, the braking torque that can be exerted by the second brake pairing is greater than the braking torque that can be exerted by the first brake pairing. It is therefore unnecessary to control or precisely adjust the braking force applied in the second brake pairing.
  • the braking effect exerted on the coil depends solely on the braking torque applied by the first brake pairing. Since the braking effect of the second brake pair is consequently not important, provided that it is only higher than that of the first brake pair, its effect can advantageously be positive.
  • the latter is particularly important in the automation of the coil braking, since braking by a stationary stop or by a stop which is movably mounted on the coil lever and is part of the second brake pairing and is brought into braking action when the coil lever is in the reel changer ⁇ lung is pivoted, can be triggered.
  • the first brake pairing is formed by the contact surfaces between the winding sleeve and a centering plate
  • the second brake pairing is formed between the centering plate and the stationary locking device.
  • the wearing part is the winding tube, but its wear is irrelevant, since it is only intended for single or double use anyway. There is therefore no need to replace wear parts.
  • the first brake pairing is formed by the centering plate and an intermediate body which is freely rotatably mounted concentrically to the centering plate and which is pressed under spring force against the centering plate. By setting this spring force, the braking torque that can be exerted by the first brake pairing can be set to an optimal value once and for all.
  • the second brake pairing in turn consists of the fixed locking device on the one hand and the intermediate body on the other hand, which is equipped with suitable devices for interacting with the fixed locking device.
  • This interaction can take place through a surface pairing if the braking effect in the second brake pairing is to be non-positive, however, the device can also consist of radially projecting pins, lugs or the like or also of radially projecting bores or the like, in which case the locking device has the suitable counter-forms for producing the positive connection.
  • the intermediate body can be, for example, a cylindrical, cut open spring ring which resiliently encompasses a drum-like extension of the centering plate and which at one end shows a kink in the radial direction, which interacts positively with the stationary locking device.
  • FIG. 1 side view of a spool device according to the invention with a spool lever in the spool change position;
  • FIG. 2 detail from FIG. 1 in an enlarged representation
  • FIG. 3 section along A - A. Fig. 2;
  • FIG. 4 another embodiment of the winding device according to the invention.
  • FIG. 11 shows the side view of a first embodiment of the winding device according to the invention.
  • the spool lever 3 On the bearing block 2 of the indicated machine frame 1, the spool lever 3 is pivotally mounted about its pivot axis 9 between the working position and the upper, the spool change position.
  • a damping bracket 5 present in the winding device shown can be pivoted about the axis 10 and is loaded by a tension spring 6 stretched out between the spring abutments 7 and 8, which keeps it in contact with the sliding block 15 during the winding travel, which in turn is supported by one on the abutment 19 ⁇ seated spring 20 is supported elastically.
  • a notch 14 is provided, into which the sliding block 15 fits with play.
  • the spring-loaded sliding block 15 reaches the notch 14 and engages in it, so that it now fixes the bobbin lever 3 in this position.
  • the part of the arm of the spool lever 3 which projects over the damping bracket 5 and which carries the sliding block 15 is omitted - as indicated by the broken line - for better visibility of the centering plate 4 attached to it and forming part of the spool spindle.
  • An essential common feature of the illustrated forms of the winding device according to the invention is the special design of the winding spindle 4 such that it can be braked vigorously by means of suitable means after lifting the bobbin 21 from the drive roller 11 and, if necessary, quickly stopped.
  • a centering plate 4 for example, as can be seen in FIG. 2, may have a recess 17 in the form of a slot or a groove or the like on its outer circumference or in its edge 29.
  • a ratchet or pawl 18 or 34 in the form of a pin, a tongue or the like is arranged so that it comes into contact with the edge 29 of the centering plate 4 or 4 towards the end of the pivoting of the spool lever 3 and engages in the recess 17.
  • the centering plate (s) 4 is stopped.
  • the sleeve 16 loaded by the winding 21 is braked due to the relative movement to the surface of the centering plate 4.
  • FIG. 1 shows two different possibilities for the arrangement of the locking device or locking pawl 18, 34.
  • a locking device 34 is shown in dash-dotted lines, which is fixed in place in such a way that it engages in the recess 17 in the edge 29 of the associated centering plate 4 when the coil change position is reached.
  • This version is particularly suitable for spooling devices in which the spool change position of the spool lever is secured by springs.
  • FIG. 2 A further embodiment is shown in particular in FIG. 2 in a detail enlargement from FIG. 1 for a winding device with a damping bracket 5.
  • the damping bracket 5, which is loaded by a spring 6 stretched out between the abutments 7, 8 and whose movement in the pulling direction of the spring 6 is preferably limited by a stop (not shown), lies against a guide on the arm of the spool lever 3 and in turn by one on a Abutment 19 seated compression spring 20 loaded sliding block 15.
  • a Ausklin ⁇ kung 14 is provided in the inner arch of the damping bracket 5, in which the sliding block 15 fits with play and to which the sliding block 15 arrives when the spool lever 3 reaches the spool change position when swung up.
  • a pawl 18 is now connected to the sliding block 15, which extends on the inside of the spool lever arm approximately in the plane of the centering plate edge 29 to the center 4, but does not touch it during the spool travel.
  • the centering plate edge 29 is one Recess 17 is provided, into which the pawl 18 preferably fits with play. If the spool lever 3 is now swung up into the spool change position so that the sliding block 15 can snap into the notch 14 after the end of the spool trip, the pawl 18 is simultaneously turned against the one rotating in the direction of rotation 35 together with the spool 21 until braking Centering plate edge 29 pressed.
  • the recess 17 passes in front of the pawl 18, it falls into the recess 17 and holds the centering plate or plates 4 in place.
  • the coil 21 rotates with the sleeve
  • the dimension of the individual recess 17 in the circumferential direction is greater than the dimension of the pawl 18 or 34 measured in the circumferential direction and for example at least the 1,2- times to 1.5 times its dimensions.
  • the front boundary 17A ⁇ FIG. 2 the recess 17, starting from the circumference of the centering plate 4 or the centering plate edge 29, be guided obliquely to the base of the recess 17 against the circumferential direction 35.
  • the pawl snaps into place
  • FIG. 3 shows a section along AA in FIG. 2. It shows the mutual arrangement of pawl 18 and sliding block 15. Both are shown as consisting of one piece, but they can also be manufactured individually and connected to one another by suitable means.
  • the (Fig. 2) in front of the spool lever sliding block 15 engages in the Notch 14 of the damping bracket 5 a.
  • the pawl 18 extends behind the spool lever arm and is locked in the recess 17.
  • Both, sliding block 15 and pawl 18, are connected to one another through an opening 27 provided in the arm of the coil lever 3, which also serves as a guide. With the help of simple precautions not shown, they can be secured in the opening 27.
  • FIGS. 4 to 7 Further embodiments of the invention, in which a modified form of the locking device is used, are the subject of FIGS. 4 to 7, with FIGS. 4 and 5 - apart from the differences in the design of the centering plates - only due to the special type distinguish between the triggering of the blocking process.
  • the centering plate 4 has the shape of a flat truncated cone. Its outward-facing end face 32 has an axially parallel (blind) bore 22 near the edge.
  • a locking pin 23 is axially displaceably mounted on the adjacent spool lever arm and is guided for this purpose in a bore in the spool lever arm.
  • the locking pin 23 has a slim cylindrical shape, the outer free end closes with a head 39 with a flat inner surface, a rounded outer surface and a significantly larger diameter than the pin 23 itself.
  • a compression spring 26 is provided between the surface of the coil lever arm and the underside of the pin head 39, which holds the pin 23 in its rest position.
  • a securing plate 24, a snap ring or the like serves as a stop and as a safeguard against falling outwards; the fuse 24 must in any case be such that it fits into the bore 22 with sufficient play.
  • a guide track 33 is fixedly attached to the machine frame 1 such that in the last phase the Coil lever movement of the locking pin 23 with its rounded head 39 comes into contact with the guideway 33.
  • the locking pin 23 is moved towards the side surface 32 of the centering plate 4 until it can snap into the bore 22 and fixes the centering plate 4.
  • the locking pin 23 is released again from the guideway 33 and the spring 26 pushes it into the rest position when the centering plate 4 is unlocked.
  • FIG. 5 An embodiment of the invention modified from that of FIG. 4 is shown in FIG. 5 in connection with a winding device with damping bracket 5, notch 14 and sliding block 15.
  • a locking pin 23 is axially displaceably mounted on the adjacent spool lever arm.
  • the locking pin 23 has the same shape as that described for FIG. 4 and is also held in the rest position by a compression spring 26.
  • the fuse 24 can be dispensed with here, since its task is solved differently.
  • a connecting lever 28 is guided to the head 39 of the locking pin 23 starting from the sliding block 15. It is connected to the sliding block 15 on the outside of the coil lever arm and is guided over the damping bracket 5 on the outside.
  • a tongue-like lever guide 37 is stably fastened on the outside of the damping bracket 5, which prevents the connecting lever 28 running beneath it from being bent outwards.
  • the lever guide 37 is attached to the damping bracket 5 on one side, specifically on the side remote from the pivot axis 10 of the damping bracket 5.
  • the side facing the pivot axis 10 is open, so that the connecting lever 28 can slide between the guide 37 and the damping bracket 5 in the course of the winding process.
  • the free end 40 of the connecting lever 28 is bent in a side view (FIG. 5) at 38 in a Z-shape.
  • the free end 40 itself runs essentially parallel to the spool lever arm and is located from the start of the spool travel in front of the head 39 of the locking pin 23, which rests against the inside of the lever end 40 by the action of the spring 26 and is thus secured against falling out.
  • FIG. 5 shows sliding block 15, connecting lever 28 and locking pin 23 in the position assumed during the winding travel
  • FIG. 7 shows the position of the parts in the holding position.
  • FIG. 6 shows the outward-facing end face 32 of a centering plate 4.
  • a groove 36 runs in the circumferential direction 35 on a circular ring section sweeping over the bore 22, which starts from the bottom of the bore 22 and, becoming ever flatter, finally ends in the end face 32 of the centering plate 4. It ensures that even with rel. high speeds of the coil 21 to be braked, the locking pin 23 can be securely inserted into the bore 22.
  • the first brake pairing consists of a centering plate and a rotary body as an intermediate brake body, which is freely rotatably mounted concentrically to the centering plate and is pressed resiliently against the centering plate via a pair of braking surfaces
  • the intermediate brake body is included in the second brake pairing FIGS. 8 to 11 show that the stationary locking device interacts.
  • the first brake pairing is formed by a centering plate 4 and an intermediate body in the form of a brake ring 43 that is freely rotatably mounted concentrically to the centering plate.
  • the brake ring 43 which is designed as a cylindrical, cut open spring ring, engages with its resiliently pretensioned braking surface 54 around the cylindrical circumferential surface 45 of a drum-like extension of the centering plate 4.
  • One end of the braking ring 43 is bent up to a stop tongue 44 which abuts a fixed stop pin 34 when the spool lever 3 is pivoted into the spool change position (FIG. 9) and the brake ring 43 stops.
  • the end 47 located at the rear in the direction of rotation 35 is preferably bent up to the stop tongue.
  • a spring steel ring is advantageously first produced, the inside diameter of which is significantly smaller than the diameter of the braking surface 45. This ring is then separated so that it has to be stretched when it is placed on the braking surface 45 and thus receives its pretension.
  • the ring 43 can be provided at any point with a projection 44 which is so far radially outwards that it can interact with the stop pin 34. Instead, the ring can also be braked if necessary by pressing on a brake pad or the like.
  • the correctly adjusted ring 43 brings about a strong, constant detachment of the centering plate 4.
  • the surface pairing 45, 54 can also be arranged such that the braking surface 45 of the centering plate 4 points radially inwards. 10 shows such an embodiment of the invention.
  • the centering plate 4 has the shape of a cup, the circular-cylindrical inner wall is designed as a braking surface 45, and the braking ring 43, with its outside braking surface 54, bears against the braking surface 45 from the inside with a radially outward bias . Accordingly, to produce the brake ring 43, a spring steel ring is advantageously first produced, the outer diameter of which is significantly larger than the diameter of the braking surface 45.
  • the ring is then separated and shortened so that it can be inserted into the braking surface. It must be pressed together, which gives it its pretension.
  • a stop tongue 44 cooperating with the fixed stop 34 is fastened to the brake ring 43.
  • the latter has, for example on the outer end face, an outer edge 46, over which a safety 52, possibly connected to the stop tongue 44, extends.
  • annular braking surface 48 is provided on the outer end face of the centering plate 4, which here lies in a normal plane to the winding axis 30 and concentric to it, but may also have a slightly conical shape, for example.
  • a plate-shaped annular brake ring 49 which is loaded during the winding travel by a strong spring 50, in the exemplary embodiment shown a plate spring which is composed of several elements and is supported against an abutment 53 connected to the arm of the coil lever 3 revolves around the centering plate.
  • a locking projection 51 attached to the brake ring 49 comes into the region of the fixed stop 34 when the spool lever 3 is pivoted into the spool change position, corresponding to the illustration in FIG. 1 or FIG. 9, so that the brake ring 49 is held in place and is prevented from turning further with the centering plate 4.
  • the centering plate is braked powerfully.
  • the drawing is based, for example, on a winding device as is known, for example, from P 38 02 434.9 (Bag. IP-1563).
  • a winding device as is known, for example, from P 38 02 434.9 (Bag. IP-1563).
  • the form of the coil braking according to the invention can also be described for the development of different winding devices such as that described in DE-PS 31 34 294 (Bag. 1211), in which, for example, the drive-side stop provided with a centering attachment can be configured accordingly. Find use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Braking Arrangements (AREA)

Abstract

Les bobinoirs sont équipés de freins permettant de les arrêter rapidement. Ces freins sont soumis à l'usure. Le dispositif de freinage décrit comporte deux ensembles de freinage dont le premier tourne concentriquement avec la canette (16). Ce premier ensemble de freinage est entraîné par friction et est en permanence chargé par ressort. Un second ensemble de freinage comprend un système de blocage fixe (18, 23, 34) et un frein qui agit sur l'autre ensemble de freinage.
PCT/DE1989/000122 1988-03-02 1989-03-02 Bobinoir Ceased WO1989008071A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE3806672 1988-03-02
DEP3806672.6 1988-03-02
DEP3824029.7 1988-07-15
DE3824029 1988-07-15
DEP3832521.7 1988-09-24
DE3832521 1988-09-24

Publications (1)

Publication Number Publication Date
WO1989008071A1 true WO1989008071A1 (fr) 1989-09-08

Family

ID=27197258

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1989/000122 Ceased WO1989008071A1 (fr) 1988-03-02 1989-03-02 Bobinoir

Country Status (3)

Country Link
EP (1) EP0359792A1 (fr)
JP (1) JPH02503420A (fr)
WO (1) WO1989008071A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4224102A1 (de) * 1991-07-27 1993-01-28 Barmag Barmer Maschf Spulvorrichtung
DE19959195A1 (de) * 1999-12-08 2001-06-13 Schlafhorst & Co W Vorrichtung zum Schwenken eines Spulenrahmens einer Textilmaschine
CN103449253A (zh) * 2012-05-26 2013-12-18 索若德国两合股份有限公司 具有用于筒子架的锁定机构的卷绕装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939628A1 (de) * 1979-09-29 1981-04-16 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Aufwickelvorrichtung fuer faeden
EP0087376A1 (fr) * 1982-02-24 1983-08-31 Société dite: ASA S.A. (société anonyme) Dispositif pour le bobinage de matières textiles comportant un élément de freinage pour l'immobilisation de l'enroulement en fin d'opération
DE3330784A1 (de) * 1982-09-06 1984-03-08 Elitex, koncern textilního strojírenství, Liberec Vorrichtung zum bremsen von spulen auf textilmaschinen, insbesondere auf spulmaschinen
DE3538190A1 (de) * 1985-10-26 1987-04-30 Saurer Allma Gmbh Schwenkbarer spulenhalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939628A1 (de) * 1979-09-29 1981-04-16 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Aufwickelvorrichtung fuer faeden
EP0087376A1 (fr) * 1982-02-24 1983-08-31 Société dite: ASA S.A. (société anonyme) Dispositif pour le bobinage de matières textiles comportant un élément de freinage pour l'immobilisation de l'enroulement en fin d'opération
DE3330784A1 (de) * 1982-09-06 1984-03-08 Elitex, koncern textilního strojírenství, Liberec Vorrichtung zum bremsen von spulen auf textilmaschinen, insbesondere auf spulmaschinen
DE3538190A1 (de) * 1985-10-26 1987-04-30 Saurer Allma Gmbh Schwenkbarer spulenhalter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4224102A1 (de) * 1991-07-27 1993-01-28 Barmag Barmer Maschf Spulvorrichtung
DE4224102C2 (de) * 1991-07-27 2000-07-13 Barmag Barmer Maschf Spulvorrichtung
DE19959195A1 (de) * 1999-12-08 2001-06-13 Schlafhorst & Co W Vorrichtung zum Schwenken eines Spulenrahmens einer Textilmaschine
US6405967B1 (en) 1999-12-08 2002-06-18 W. Schlafhorst Ag & Co. Device for pivoting a creel of a textile machine
CN103449253A (zh) * 2012-05-26 2013-12-18 索若德国两合股份有限公司 具有用于筒子架的锁定机构的卷绕装置
EP2666740A3 (fr) * 2012-05-26 2014-10-01 Saurer Germany GmbH & Co. KG Dispositif de bobinage doté d'un moyen d'arrêt pour le cadre de bobine

Also Published As

Publication number Publication date
JPH02503420A (ja) 1990-10-18
EP0359792A1 (fr) 1990-03-28

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