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EP0386519B1 - Procédé et dispositif pour embobiner une longueur prédéterminée de fil en couches sur une bobine - Google Patents

Procédé et dispositif pour embobiner une longueur prédéterminée de fil en couches sur une bobine Download PDF

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Publication number
EP0386519B1
EP0386519B1 EP90103265A EP90103265A EP0386519B1 EP 0386519 B1 EP0386519 B1 EP 0386519B1 EP 90103265 A EP90103265 A EP 90103265A EP 90103265 A EP90103265 A EP 90103265A EP 0386519 B1 EP0386519 B1 EP 0386519B1
Authority
EP
European Patent Office
Prior art keywords
yarn
winding
length
bobbin
flyer
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
EP90103265A
Other languages
German (de)
English (en)
Other versions
EP0386519A1 (fr
Inventor
Markus Erni
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.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter 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 Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP0386519A1 publication Critical patent/EP0386519A1/fr
Application granted granted Critical
Publication of EP0386519B1 publication Critical patent/EP0386519B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/24—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to delivery of a measured length of material, completion of winding of a package or filling of a receptacle
    • 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
    • B65H54/28—Traversing devices; Package-shaping arrangements
    • B65H54/36—Yarn-guide advancing or raising mechanisms, e.g. cop-building arrangements
    • B65H54/365—Yarn-guide advancing or raising mechanisms, e.g. cop-building arrangements for cops of pirn winding machine
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/14—Details
    • D01H1/36—Package-shaping arrangements, e.g. building motions, e.g. control for the traversing stroke of ring rails; Stopping ring rails in a predetermined position
    • D01H1/365—Package-shaping arrangements, e.g. building motions, e.g. control for the traversing stroke of ring rails; Stopping ring rails in a predetermined position for flyer type
    • 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 present invention relates to a method for winding predetermined lengths of yarn in layers on a spool with the aid of a winding element, in particular for winding roving onto roving bobbins on a flyer, with a relative, axial back and forth movement between the winding element and the bobbin during winding takes place, in order to reach a predetermined position of the yarn end or the roving end on the spool, the spooled yarn length is measured continuously during winding and upon reaching a predetermined spool length to be wound, the device which determines the relative position of the winding element and the spool is controlled in this way that it reaches the specified point.
  • the invention also relates to a device for winding predetermined lengths of yarn in layers on a bobbin according to the preamble of claim 11. A method or a device of this type is known from US-A-3 861 130.
  • the method according to the invention provides that the first length of yarn to be wound up is chosen such that it is shorter than the predetermined length of yarn and ends in approximately one of the last layers that when the first length of yarn to be wound up reaches the relative, axial position of the winding element and the bobbin or one of these proportional parameters is determined, and the device which changes the relative position is controlled in such a way that the yarn length still remaining up to the predetermined yarn length at least by means of targeted relative, axial reciprocating movements which differ in amplitude from the previous amplitude essentially comes to an end at the specified point.
  • the procedure is therefore such that the amplitude of the axial reciprocating movements of the winding member relative to the spool in the final phase of the winding is controlled so that the last layer of turns and in most cases the last two layers of turns has or have an axial length that deviates from the axial length of the previous layers, but is selected so that the yarn end always comes to lie at the same axial position or height of the bobbin.
  • the procedure is such that the last part of the to-and-fro movement always has the same length, which ensures that the yarn or roving is always in the same axial direction with respect to the bobbin during the following unwinding process moves, which also benefits the automatic handling of the spool.
  • the predetermined yarn length should be 5000 m, that the axial length of the fully wound bobbin is 50 cm, and that the last 100 m of the roving has a space requirement of 30 cm for the diameter of the fully wound bobbin in one layer.
  • the wound length is measured continuously and when a wound length of 4900 m is reached, the exact axial position of the winding element relative to the reel is measured. Assuming that this axial position is 20 cm from the lower end of the bobbin, in the normal winding process the winding of the last 100 m would be 50 cm from the lower end of the bobbin, the roving end.
  • the machine is controlled so that the winding in the upward direction direction is made over a further axial length of 12.5 cm, that the winding direction then reverses and takes place over an axial length in the opposite direction of 12.5 cm, after which it reverses again and the last 5 cm to the center of the coil again be wound up in the upward direction.
  • the procedure according to the invention is preferably such that, after reaching the predetermined wound-up yarn length, a value from the subsequent winding operation is determined which represents the relative, axial movement of the winding element and the bobbin per meter of yarn or is proportional. I.e. that the control of the winding process and the determination of the last two reversal points is now carried out on the basis of the value determined in this way.
  • the stated value can be determined from the roving length wound up during a certain time and the stroke movement of the bobbin taking place during this time. Knowing this value, one only needs to multiply the remaining roving length by the factor determined in this way in order to calculate the axial length of the remaining piece of yarn, starting from the first measuring point, the control must take this lifting movement into account together with the lifting movement that has already taken place since the predetermined yarn length has been reached for setting the reversal points. It would also be entirely possible in the sense of the invention to determine the reversal points directly on the basis of the additional stroke length calculated in this way, provided that the control is then constructed in such a way that it starts from the current stroke height.
  • the stated value can also represent the relative axial movement per winding length on the coil.
  • this winding length can be determined from the length of roving delivered by the delivery cylinder of the drafting system during a certain time and the number of turns generated during this time based on the differential speed of the flyer wings and the flyer spools. By simultaneously determining the lifting movement of the flyer coils during the stated time, it is then possible to calculate the desired value of the relative axial movement per winding length on the coil.
  • the lifting movement of the flyer coils during the stated time can itself be determined, for example, from the speed of a motor producing the lifting movement by means of threaded spindles and the pitch of the threaded spindles, provided that the motor drives the spindles at the motor speed. If there is a gearbox with a gear ratio between the motor and the threaded spindle, the gear ratio must be taken into account.
  • control There are many options for the specific design of the control. For example, it is not necessary to specify the predetermined yarn length in meters, but one can simply specify a count of the counter counting the revolutions of the delivery cylinder.
  • the axial stroke movement also does not need to be expressed in centimeters, but can be done by counting the revolutions of the lift motor between the reversal points.
  • a preferred device for winding predetermined lengths of yarn in layers on a spool with the aid of a winding element for example for winding roving onto flyer bobbins on a flyer, with a drive for generating a relative, axial back and forth movement between the Winding element and the bobbin during winding, whereby a measuring device is provided to reach a predetermined position of the yarn end or the roving end on the bobbin, which measures the wound yarn length continuously during winding, is characterized in that a determining device is provided, which when a predetermined first yarn length to be wound up, which is shorter than the predetermined yarn length and ends in approximately one of the last layers, determines the relative axial position of the winding element and the bobbin or one of these parameters proportional, and that a control device is provided which, taking into account the remaining yarn length up to the predetermined yarn length, controls said drive for reciprocating movements which differ in amplitude from the previous amplitude and which come to an end at least
  • the determining means preferably includes a microprocessor that is programmed to perform the calculations based on the signals detected. Both the measuring device and the determining device and the control device are preferably at least partially formed by a microprocessor that carries out the winding process. As a result, the microprocessor has the function of a control processor, which takes over the entire control of the winding process.
  • the measuring device is preferably characterized in that it measures the length of the roving wound by the rotations of the delivery cylinder and is preferably in the form of a tachometer generator.
  • the latter would then be connected to the microprocessor, possibly with the interposition of a counter and / or a suitable interface.
  • the reversal points of the back and forth movements can be predetermined by or via the latter, the back and forth movements of different amplitude being determined by changing the reversal points during the last phase of the winding.
  • the microprocessor can change the position of adjustable limit switches that determine the reversal points, or, what is preferred, fix these reversal points electronically or to adjust.
  • a flyer 2 nowadays usually has 100 to 200 such spinning positions. These spinning positions 4 are arranged in two rows on the same side of the flyer, the flyer wings 5 of one row being offset from the flyer wings of the other row.
  • the two rows of flyer wings are mounted in a common hollow beam 8 and are driven together by a drive arranged in this beam 8, as will be explained in more detail below.
  • Such a flyer is described for example in DE-OS 25 43 842.
  • a fuse 10 is pulled out of a can 12 and fed to a drafting device 16 via a deflection roller 14.
  • the drafting system has two spaced-apart pairs 18 and 20 of drafting rollers which are driven at different speeds in a manner known per se and form a forward draft field in which the sliver 10 is stretched for the first time.
  • the fuse is often guided in the main drafting zone by two endless belts 23, 25, which each wrap around a roller of the roller pair 20 and run over respective guides arranged in the region of the roller pair 22.
  • the revolutions of this shaft, which at the same time correspond to the revolutions of the delivery cylinders 26, are measured via a tachometer generator 30 (only indicated schematically) and fed via line 32 to a microcomputer 34, which counts the impulses received and from this evaluates the roving length emitted by the pair of rollers 22.
  • the stretched roving 36 which emerges from the pair of rollers 22, then comes directly into the neck 38 of one of the flyer wings 5 and through its right arm 42 in the drawing to the press finger 44 which is rotatable about its longitudinal axis at the lower end of the arm and which by means of a Spring (not shown) is constantly pressed against the surface of the developing reel 46.
  • the further arm part 48 of the flyer wing is used to balance the flyer wing. 10.1 indicates that a further fuse is also fed to the adjacent flyer wing in the outer row.
  • the hollow neck 38 of the flyer arm is supported in a bearing which is located within the hollow bar 8.
  • the hollow bar 8 extends over the entire left side of the flyer and includes the rotary drive for the flyer wings 5.
  • a shaft 56 carrying gears 54 extends along the hollow bar 8, the gears 54 being attached to the Comb sleeves 38 of the flyer wing attached gears 58.
  • the motor producing the rotary movement 60 of the gear wheels 58 and therefore the rotary movement of the flyer wing 5 in the direction of the arrow 57 is not shown in the drawing for the sake of illustration, but is merely indicated by a line 64 that the control of the corresponding motor that controls the entire spinning positions drives, takes place from the computer 34.
  • a common drive motor it is also possible to provide a separate motor for each spinning station.
  • the flyer coils which are partially wound in the drawing, each have sleeves 66 which are driven by further gear wheels 68 via a further longitudinal shaft 70 equipped with gear wheels 72.
  • the longitudinal shaft 70 as well as the gear wheels 68 and the gear wheels 72 are located within a further hollow beam 76.
  • the longitudinal shaft extending along the hollow beam 76 is driven by a motor (not shown). This motor, not shown, is connected via line 74 to the computer 34 and controlled by it.
  • the hollow beam 76 which forms the so-called coil bank, is supported at both ends by threaded spindles 78, only one of which is shown schematically in the drawing.
  • the two spindles 78 are driven synchronously by a respective motor 82, these motors also being controlled from the microcomputer 34 via corresponding lines 84 (only one shown).
  • limit switches 85 and 86 two limit switches are shown purely schematically, which come into contact with the upper and lower surfaces of the housing part 80 at the upper and lower ends of the normal stroke movement, for example, and are actuated by them to reverse the spindle movement.
  • the function of the limit switches 85, 86 is in fact managed electronically from the microcomputer 34, which counts the number of revolutions of the lifting motors 82 and electronically calculates the desired reversal points therefrom.
  • the spindle motors 82 are actuated again, in the sense that the lifting movement reverses at these points.
  • the flyer spool and the spool bank 76 take part in this lifting movement, while the height of the flyer wings 5 remains constant during the winding operation.
  • windings with the shape shown are formed on the sleeves 66, the conical parts at the upper and lower ends of the flyer spool being produced by electronic change in the reversal points of the lifting movement by means of the computer 34 and to form a stable structure lead for the fully wound flyer spool.
  • the bobbin bank 76 is moved all the way down so that the full bobbins 46 are released from the flyer wings and then tilted counterclockwise (to carry out a doffing process).
  • the computer 34 receives signals as to which of the yarn length supplied by the delivery cylinder 26 and therefore also that on the flyer bobbin correspond to wound yarn length.
  • the microcomputer 34 checks, based on the control signals for the drive motor 82, the current axial height of the pressing finger 44, which is the winding element, relative to the flyer spool 46.
  • the computer determines from the subsequent winding operation 34 then from the signals of the tachometer generator 30 and from the control signals for the motor 82 a value which corresponds to the relative, axial movement of the winding element and the bobbin per meter of yarn. From this value and the remaining length of yarn still to be wound up, which is necessary to achieve the predetermined length of yarn, the computer 34 then determines the required lifting movement and the reversal points necessary to bring the end of the yarn to the desired location.
  • the computer 34 can determine the axial stroke movement per turn and the length of this turn, for which purpose the different speeds of the shaft 56 and the shaft 70 are taken into account, based on the control signals sent to the respective motors via the lines 64 and 74 are delivered.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Claims (16)

  1. Procédé pour enrouler des longueurs de fil prédéterminées en couches sur une bobine, à l'aide d'un élément d'enroulement, particulièrement pour enrouler des mèches sur des bobines de banc à broches d'un banc à broches, et où un mouvement relatif axial, aller-retour, a lieu entre l'élément d'enroulement et la bobine pendant l'enroulement, et où, dans le but d'atteindre un lieu prédéterminé de l'extrémité de fil respectivement de l'extrémité de mèche sur la bobine, la longueur de fil enroulée est mesurée continuellement pendant l'enroulement, et, lorsqu'une première longueur de fil prédéterminée à enrouler est atteinte, l'arrangement qui détermine la position relative de l'élément d'enroulement et de la bobine, est commandé de telle sorte qu'il atteint le lieu prédéterminé, caractérisé par le fait que
    la première longueur de fil à enrouler est choisie de telle sorte qu'elle soit plus courte que la longueur de fil prédéterminée et qu'elle se termine à peu près dans une des dernières couches, que. lorsque cette première longueur de fil à enrouler est atteinte, la position relative axiale de l'élément d'enroulement et de la bobine, ou un paramètre proportionnel à celle-ci, est déterminée, et l'arrangement modifiant la position relative est commandé de telle façon que la longueur de fil encore restante jusqu'à la longueur de fil prédéterminée, se termine au moins essentiellement dans le lieu prédéterminé, par des mouvements relatifs axiaux, allerretour, ciblés, qui s'écartent dans leur amplitude de l'amplitude effectuée jusqu'à présent.
  2. Procédé selon revendication 1,
    caractérisé par le fait que
    l'arrangement, changeant la position relative de l'élément d'enroulement et de la bobine, est commandé de telle sorte que la dernière partie du mouvement aller-retour a lieu constamment dans la même direction, et de préférence vers le haut.
  3. Procédé selon revendication 2,
    caractérisé par le fait que
    la dernière partie du mouvement aller-retour possède aussi toujours la même longueur.
  4. Procédé selon l'une des revendications précédentes,
    caractérisé par le fait que,
    après que la longueur de fil enroulée prédéterminée est atteinte, une valeur est déterminée en fonction de la marche d'enroulement suivante, laquelle représente le mouvement relatif axial de l'élément d'enroulement et de la bobine par mètre de fil, ou qui est proportionnelle à celui-ci.
  5. Procédé selon revendication 4,
    caractérisé par le fait que,
    dans un banc à broches, ladite valeur est déterminée en fonction de la longueur de mèche enroulée pendant un temps déterminé, et du mouvement de course de la bobine qui a lieu pendant ce temps.
  6. Procédé selon revendication 4,
    caractérisé par le fait que
    ladite valeur représente le mouvement relatif axial par longueur d'enroulement sur la bobine.
  7. Procédé selon revendication 6,
    caractérisé par le fait que,
    dans un banc à broches, la longueur d'enroulement est déterminée en fonction de la longueur de mèche délivrée par le cylindre délivreur du train d'étirage pendant un temps déterminé, et du nombre de spires qui résultent de la différence du nombre de tours des ailettes de banc à broches et des bobines de banc à broches, pendant ce temps.
  8. Procédé selon revendication 7,
    caractérisé par le fait que
    le mouvement de course des bobines de banc à broches est déterminé pendant ledit temps.
  9. Procédé selon revendication 8,
    caractérisé par le fait que
    le mouvement de course des bobines de banc à broches pendant ledit temps est déterminé en fonction du nombre de tours d'un moteur produisant le mouvement de course à l'aide de broches filetées, et de l'inclinaison du filetage des broches.
  10. Procédé selon une des revendications 4 à 9,
    caractérisé par le fait que,
    lors de l'enroulement d'une pluralité de spires sur la couche présumée initialement comme étant la dernière, ou lors d'un changement de direction des mouvements relatifs aller-retour, pendant la détermination de ladite valeur, celle-ci est à nouveau déterminée, afin de réaliser la commande sur la base de la valeur nouvellement déterminée.
  11. Dispositif pour enrouler des longueurs de fil prédéterminées en couches sur une bobine (46), à l'aide d'un élément d'enroulement (44), particulièrement selon l'une des revendications précédentes, par exemple pour enrouler des mèches sur des bobines de banc à broches d'un banc à broches, avec un entraînement (78, 80, 82) pour produire un mouvement relatif axial, aller-retour, entre l'élément d'enroulement (44) et la bobine (46) pendant l'enroulement, et où, dans le but d'atteindre une position prédéterminée de l'extrémité de fil respectivement de l'extrémité de mèche sur la bobine, un dispositif de mesure (30) est prévu, lequel mesure continuellement la longueur de fil enroulée pendant l'enroulement,
    caractérisé par le fait
    qu'un arrangement de détermination (34) est prévu et détermine la position relative axiale de l'élément d'enroulement (44) et de la bobine (46), ou un paramètre proportionnel à celle-ci, lorsqu'une première longueur de fil à enrouler prédéterminée est atteinte, qui est plus courte que la longueur de fil prédéterminée et qui se termine à peu près dans une des dernières couches, et qu'un arrangement de commande est prévu qui, en prenant en considération la longueur de fil encore restante jusqu'à la longueur de fil prédéterminée, commande ledit entraînement (78, 80, 82) des mouvements aller-retour qui, dans leur amplitude, s'écartent de l'amplitude effectuée jusqu'à présent, mouvements qui se terminent au moins essentiellement dans la position prédéterminée.
  12. Dispositif selon revendication 11,
    caractérisé par le fait
    qu'au moins l'arrangement de détermination comprend un microprocesseur (34).
  13. Dispositif selon revendication 11 ou 12,
    caractérisé par le fait que
    non seulement l'arrangement de mesure (30), mais également l'arrangement de détermination et l'arrangement de commande sont formés au moins partiellement par un microprocesseur (34) réalisant le procédé d'enroulement.
  14. Dispositif selon une des revendications 11 à 13, sous forme d'un banc à broches avec une pluralité de postes de travail dont chacun est constitué par un train d'étirage pour l'étirage du ruban (10, 10.1) l'alimentant, et où le cylindre délivreur (26) du train d'étirage (16) dirige, vers l'ailette de banc à broches (5) lui étant attribuée, la mèche (36, 36.1) formée par le ruban étiré (10, 10.1), avec un banc porte-bobines (76) maintenant les bobines de banc à broches (46) et pouvant être entraîné par ledit entraînement en un mouvement aller-retour, et avec des arrangements (68, 70, 72; 54, 56, 58) utilisés pour entraîner en mouvements de rotation avec des nombres de tours différents, les bobines (66) et les ailettes de banc à broches (5),
    caractérisé par le fait que
    l'arrangement de mesure (30) mesure la longueur de mèche enroulée, par les rotations du cylindre délivreur (26), et est formé de préférence comme un générateur tachymétrique.
  15. Dispositif selon revendications 13 et 14,
    caractérisé par le fait que
    le générateur tachymétrique (32) est raccordé au microprocesseur (34), le cas échéant avec insertion d'un compteur.
  16. Dispositif selon revendication 15,
    caractérisé par le fait que
    les points d'inversion des mouvements aller-retour peuvent étre donnés à l'avance depuis respectivement via le microprocesseur (34), et que, pendant la dernière phase de l'enroulement, les mouvements aller-retour ayant une amplitude qui dévie, sont déterminés par changements des points d'inversion.
EP90103265A 1989-03-01 1990-02-20 Procédé et dispositif pour embobiner une longueur prédéterminée de fil en couches sur une bobine Expired - Lifetime EP0386519B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3906474 1989-03-01
DE3906474A DE3906474A1 (de) 1989-03-01 1989-03-01 Verfahren und vorrichtung zum aufwickeln von vorbestimmten garnlaengen in lagen auf einer spule

Publications (2)

Publication Number Publication Date
EP0386519A1 EP0386519A1 (fr) 1990-09-12
EP0386519B1 true EP0386519B1 (fr) 1995-09-13

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EP90103265A Expired - Lifetime EP0386519B1 (fr) 1989-03-01 1990-02-20 Procédé et dispositif pour embobiner une longueur prédéterminée de fil en couches sur une bobine

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Country Link
EP (1) EP0386519B1 (fr)
JP (1) JPH0333230A (fr)
DD (1) DD297466A5 (fr)
DE (2) DE3906474A1 (fr)

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DE4418374A1 (de) * 1994-05-26 1995-11-30 Zinser Textilmaschinen Gmbh Maschine zum Bearbeiten synthetischer Fäden
JP2585202B2 (ja) * 1994-12-22 1997-02-26 ヤンマー農機株式会社 施肥，播種機
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EP0927780B1 (fr) * 1997-12-22 2000-05-10 Zinser Textilmaschinen GmbH Procédé et dispositif pour déposer et séparer un ruban dans un banc à broches
CN110316617B (zh) * 2019-09-04 2024-01-23 李进丁 无托盘可变径多连杆绕线系统
CN115258822B (zh) * 2022-07-26 2023-08-11 青岛宏大纺织机械有限责任公司 一种络筒机单锭卷绕计长方法及自动络筒机

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CH635300A5 (de) * 1979-04-10 1983-03-31 Zellweger Uster Ag Verfahren und vorrichtung zur erzielung vorbestimmbarer und genauer garnlaengen auf kreuzspulen.
DE3225487A1 (de) * 1981-08-21 1983-07-21 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Drahtaufwickelmaschine
DE3716473A1 (de) * 1987-05-16 1988-11-24 Schlafhorst & Co W Verfahren zum sortieren von kreuzspulen an einem spulautomaten

Also Published As

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JPH0333230A (ja) 1991-02-13
DE3906474A1 (de) 1990-09-06
DD297466A5 (de) 1992-01-09
DE59009640D1 (de) 1995-10-19
EP0386519A1 (fr) 1990-09-12

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