EP0374431B1 - Bobinoir automatique avec bande transporteuse pour supports de bobines - Google Patents

Bobinoir automatique avec bande transporteuse pour supports de bobines Download PDF

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Publication number
EP0374431B1
EP0374431B1 EP89119891A EP89119891A EP0374431B1 EP 0374431 B1 EP0374431 B1 EP 0374431B1 EP 89119891 A EP89119891 A EP 89119891A EP 89119891 A EP89119891 A EP 89119891A EP 0374431 B1 EP0374431 B1 EP 0374431B1
Authority
EP
European Patent Office
Prior art keywords
conveyor belt
spool holder
bobbin
holder conveyor
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
EP89119891A
Other languages
German (de)
English (en)
Other versions
EP0374431A2 (fr
EP0374431A3 (fr
Inventor
Hans Grecksch
Rene Bucken
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 Textile GmbH and Co KG
Original Assignee
W Schlafhorst AG and Co
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
Priority claimed from DE19883843554 external-priority patent/DE3843554C2/de
Application filed by W Schlafhorst AG and Co filed Critical W Schlafhorst AG and Co
Publication of EP0374431A2 publication Critical patent/EP0374431A2/fr
Publication of EP0374431A3 publication Critical patent/EP0374431A3/fr
Application granted granted Critical
Publication of EP0374431B1 publication Critical patent/EP0374431B1/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
    • D01H9/00—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine
    • D01H9/18—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine for supplying bobbins, cores, receptacles, or completed packages to, or transporting from, paying-out or take-up stations ; Arrangements to prevent unwinding of roving from roving bobbins
    • D01H9/187—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine for supplying bobbins, cores, receptacles, or completed packages to, or transporting from, paying-out or take-up stations ; Arrangements to prevent unwinding of roving from roving bobbins on individual supports, e.g. pallets

Definitions

  • the invention relates to an automatic winder, consisting of lined-up winding units, with a bobbin conveyor belt which runs along the automatic winder and which supplies the winding units or their magazines with winding bobbins standing on individual bobbin carriers.
  • an automatic winder which consists of sections lined up with several winding stations each and which has a pay-out spool conveyor which equips the pay-off points or their magazines with pay-off spools.
  • At least one further pay-out reel conveyor is arranged on the long side of the automatic winder and controllable transfer stations for transferring the pay-out reels from one of the further pay-off reel conveyors to the pay-off reel conveyor loading the reels or their magazines or to another one closer to the reel-loading or the magazines
  • the bobbin conveyors are designed as conveyor belts and the transfer stations have controllable switches.
  • Such a device is also very complex and not very flexible in its handling.
  • the invention has for its object to provide the prerequisites that an automatic winder can be subdivided again and again from case to case without great effort into differently sized and freely selectable sections and these sections can then be supplied with payout bobbins in different lots on individual bobbins .
  • a single reel carrier conveyor belt is available, that the drive device of the reel carrier conveyor belt can be switched by a switching device to right and left running of the conveyor belt, that the reel carrier conveyor belt at least has two spaced-apart feed points for individual bobbin holders equipped with payout bobbins and has a transport lock for the individual bobbin holders that can be inserted or switched in the section located between two feed points, and that the bobbin carrier conveyor belt can be subdivided into different, separate conveyor sections by differently selected transport locks, which are preferably assigned selectable feeder bays are.
  • the location and size of the sections to be supplied depends on the chosen arrangement of the transport locks. The more distant feed points there are, the more individual sections can be formed as desired.
  • the conveyor belt which alternates between clockwise and counterclockwise rotation, is able to transport all the batches to the selected winding units at the same time. This means that coil carriers that can no longer be stowed are jammed at the respective transport locks. They are transported back in the opposite direction as soon as the reel carrier conveyor reverses its direction of travel. There can be no overfilling problems because the bobbin conveyor belt slips under the individual bobbin carriers that have not been transported. When feeding in, it is therefore not necessary to take particular account of whether the conveying section of the bobbin transport belt still contains individual bobbin carriers or not.
  • At least one feed point is arranged at one end of the coil carrier conveyor belt. This can be advantageous for temporary or predominant funding in one direction and less funding in the opposite direction.
  • At least one feed point is arranged in a conveyor section of the bobbin carrier belt located between bobbins. This is particularly advantageous if different, in particular also smaller, batches are often run. The transport path of these lots along the coil carrier conveyor belt can be shortened as a result.
  • feed points spaced apart from one another both at the ends and along the automatic winder It has to be decided on a case-by-case basis whether this is appropriate and how many feed-in points are likely to be required. On the other hand, it is also easy to subsequently increase the number of feed points on an automatic winder that has only two or a small number of feed points, as well as the number of transport locks.
  • an adjustable or switchable transport lock is arranged along the reel carrier conveyor belt between all reel stations.
  • the winding units are divided into sections each comprising a plurality of winding units, the adjustable or switchable transport locks being arranged at the section boundaries. This already takes into account that the number of sections should be limited and that the number of winding units per section is also known beforehand. The technical effort can be minimal in this way.
  • an additional adjustable or switchable transport lock is arranged on at least one end of the bobbin transport belt. This is particularly advantageous if the reel carrier conveyor belt is occasionally to be run empty. Otherwise, it would suffice to provide either fixed transport locks at the ends of the reel carrier conveyor belt or, instead of the transport locks, to provide feed points at the same point.
  • the winding units or their magazines have transport means which connect the individual reel carrier conveyor belt and automatically derive an individual reel carrier which is transported in any direction on the single reel carrier conveyor belt if the relevant winding unit is in need of supply and which, for example, into the guideway delimited by side guides on the Single reel carrier conveyor belt, single reel carrier equipped with payout reels protrude into it.
  • Each winding unit picks up a single bobbin from the single bobbin conveyor belt completely automatically if required. If the demand is met, the next individual bobbin, for example, continues along the rearmost individual bobbin standing on the transport means of the bobbin to the next bobbin.
  • the automatic winder designated 39 has only five winding units 40 to 44, of which FIG. 1 only shows the winding unit 42.
  • a housing 45 containing gear parts is attached to a carrier 48.
  • the carrier 48 connects two end frames (not shown here) of the automatic winder 39 to one another.
  • the housing 45 carries the pivot axis 49 of a bobbin frame 50, 51, which in turn serves to rotatably accommodate a package which forms the package 52.
  • the cheese 52 lies on a reversing thread roller 53, the shaft 54 of which is rotatably mounted on the housing 45 and which is driven by gear means which are located in the interior of the housing 45.
  • suction tube 56 On the housing 45, a pivotable about the pivot point 55 suction tube 56 is mounted, which can be pivoted up to the position 56 'to seek a thread end on the surface of the package 52, absorb and when swiveling back to the starting position the feeder arms 57, 58 of an automatic thread splicing device 59 to be submitted.
  • a second suction pipe 60 is pivotally mounted on the housing 45 about the pivot point 61.
  • the suction tube 60 is used to pick up the thread end of a payout spool in the form of a cop 20, which is at a payoff point 42 'of the spool 42 on a single bobbin 13.
  • the individual spool holder 13 is provided with a push-on pin 25, onto which the sleeve of a payout spool in the form of a cop 20 is attached.
  • Fig. 1 shows that at the winding unit 42 on the pins 26 and 27 further individual coil carriers 14 and 15 further cops 21 and 22 are plugged. These cops are to be gradually wound into cross-wound bobbins at the track point 42.
  • Fig. 1 also indicates that another single bobbin 24, the plug-on pin 29 carries a developed, empty sleeve 31, which is just about to leave the drainage point 42 'in the direction of a sleeve removal belt 32 guided along the automatic winder 39.
  • the plug-on pin 29 On the sleeve conveyor belt 32 there is a further individual bobbin 23, the push-on pin 28 of which carries an unwound empty sleeve 30.
  • Fig. 2 indicates that a continuously running conveyor belt 33 to 37 is present at the discharge points of the individual winding stations 40 to 44, which extends from a bobbin carrier belt 38 to the sleeve conveyor belt 32.
  • the conveyor belts 33 to 37 each run in the direction of the arrows shown in FIG. 2.
  • the upper run of the conveyor belt 35 of the winding unit 42 runs in the direction of the arrow 46.
  • One belt roller of the conveyor belt 35 has a continuously running drive motor, and the other belt roller of the same conveyor belt only serves as a deflection roller.
  • locking means not shown here, individual coil carriers standing at the discharge points are prevented by switchable, but not shown, locks at the onward transfer site, as long as the unwinding of the cop is not yet finished.
  • the suction tube 60 can first be moved into a position 60 'and finally into a position 60' according to FIG. 1. In the position 60 ', the thread end is picked up and sucked in, in the position 60 ⁇ it is inserted into a computing button 62, whereupon the suction tube 60 then pivots counterclockwise in a circle until it has returned to its starting position. It automatically loses the thread end.
  • a third intake manifold 63 is pivotable from a rest position shown via a suction position 63 'into a discharge position 63.. In the suction position 63 'it takes on the thread end held by the rake button 62 to then present it in the delivery position 63 ⁇ to the feeder arms 57, 58 of the thread splicing device 59.
  • both thread ends enter the thread splicing device 59, which can then produce a thread connection by splicing in a conventional manner.
  • the reversing thread roller 53 then starts to move in the direction of the curved arrow 64, the thread 65 is continuously pulled off overhead of the cop 20 and through the computing key 62, a thread brake 66 and the measuring slot of a thread cleaner 67, the reversing thread roller 43 and thus the cheese 52 fed.
  • the drive device of the bobbin conveyor belt 38 has a control device 70 as a switching device, to which two electrical external rotor motors, so-called belt motors 73, 74, are connected via operative connections 71, 72.
  • the two belt motors 73, 74 are located at the ends of the bobbin conveyor belt 38. They can be reversed by the control device 70 at intervals which can be adjusted by means of an adjusting button 75 is selectable and adjustable. For example, if the belt motor 74 pulls on the upper run of the bobbin conveyor belt 38, this belt runs in the direction of arrow 47. On the other hand, if the belt motor 73 pulls on the upper run, the bobbin belt conveyor belt 38 runs in the opposite direction.
  • the bobbin conveyor belt 38 has a total of four spaced-apart feed points 76 to 79 for individual bobbin holders 1 to 4 equipped with payout bobbins.
  • the feed points 76 to 79 are also designed as conveyor belts, which either always or only in the case of the feed in the direction of the arrows shown in FIG. 2 to run.
  • One feed point 76 is arranged at one end of the bobbin conveyor belt 38, another feed point 79 is arranged at the other end of the same belt.
  • the feed point 77 is arranged in a conveyor section located between the winding station 40 and the winding station 41, the feed point 78 is arranged in a conveyor section of the bobbin carrier conveyor belt 38 located between the winding station 42 and the winding station 43.
  • Various individually switchable transport locks 80 to 85 are arranged along the bobbin transport belt 38.
  • the transport lock 80 is located next to the feed point 76 at one end, the transport lock 85 next to the feed point 79 at the other end of the bobbin carrier conveyor belt 38.
  • the other transport locks 81 to 84 are arranged along the bobbin carrier conveyor belt 38 between all the bobbin stations 40 to 44 so that when all transport locks are switched on, each infeed station is assigned its own winding station.
  • the winding unit 42 would not be supplied in this case.
  • sections comprising several winding units can also be formed, and these sections could then be assigned to selected feeding units. So are according to Fig.
  • sections I and II were formed by only the transport locks 80, 83 and 85 being switched on.
  • the section I is hereby formed from the winding units 40, 41 and 42, the section II from the winding units 43 and 44.
  • Section I can be supplied from feed points 76 and 77, section II from feed points 78 and 79.
  • the facility can be operated as follows: It is assumed that a different batch of yarn is processed in section I than in section II. Section I is to be supplied from feed point 77, and section II from feed point 78. It is assumed that feed points 76 and 79 are out of service. Furthermore, it is assumed that the average winding speed of the individual bobbins, in particular due to sporadically occurring yarn breaks, is different.
  • the conveyor belts 33 to 37 run faster than the reel carrier conveyor belt 38.
  • the intervals between the switching of the belt motors 73 and 74 have been set on the control unit 70 so that a single head carrier, for example, which is adjacent to the transport lock 80, during the time in which the reel carrier conveyor belt 38 in the direction of Arrow 47 runs until it reaches the transport lock 38 and that a single spool carrier lying there arrives at the transport lock 80 during the time in which the spool carrier conveyor belt 38 runs in the opposite direction of the arrow 47.
  • the bobbin conveyor belt 38 thus alternately runs back and forth.
  • Fig. 2 shows that the individual spool carriers 5 to 7 are currently on the spool carrier conveyor 38.
  • the individual coil carriers 1 and 4 are at rest because the feed points 76 and 79 are out of operation.
  • the individual reel carriers 2 and 3 will shortly be transferred to the reel carrier conveyor 38.
  • Baffles 86 serve to guide all individual coil supports to 96, of which the guide plates 86 to 90 serve the lateral guidance of the individual coil carriers both on one side of the coil carrier conveyor belt 38 and on both sides of the feed points 76 to 79.
  • the baffles 87 to 89 are provided with indentations 97 to 101. The indentations are located exactly opposite the winding units 40 to 44. They are used to guide individual coil carriers transported on the coil carrier conveyor belt 38 past the third individual coil carrier, which is at a winding unit for unwinding.
  • the winding units 41 and 42 have no need for winding spools.
  • the requirements of the winding units 40 and 43 are just being met.
  • the individual coil carrier 5 has already been gripped by the conveyor belt 30 and will immediately bear against the individual coil carrier 9.
  • the single bobbin 7 has already been gripped by the conveyor belt 36 and will immediately abut against the single bobbin 17.
  • the bobbin requirement of the bobbin 44 can only be covered when the individual bobbin 3 has reached the bobbin conveyor belt 38.
  • the bobbin conveyor belt 38 can be cleared at any time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
  • Replacement Of Web Rolls (AREA)

Claims (7)

  1. Bobinoir automatique (39) constitué par des têtes de bobinage (40 à 44) alignées les unes sur les autres et comprenant une bande de transport des supports de bobines (38) qui est guidée le long du bobinoir automatique et qui alimente les têtes de bobinage ou leurs magasins en bobines débitrices (20 à 22) posées sur des supports de bobines individuels (13 à 15), caractérisé par le fait qu'une bande unique de transport des supports de bobines (38) est présente, par le fait que le dispositif d'entraînement (70, 73, 74) de la bande de transport des supports de bobines (38) peut être inversé par un dispositif d'inversion de marche (70) pour que la bande transporteuse (38) se déplace vers la droite ou vers la gauche, par le fait que la bande de transport des supports de bobines (38) comporte au moins deux postes d'alimentation (76 à 79) distants entre eux et destinés à des supports de bobines individuels (1 à 4) garnis de bobines débitrices, par le fait que la bande de transport des supports de bobines (38) comporte, dans la section située entre deux postes d'alimentation (76 à 79), un organe (81 à 84) d'arrêt du transport des supports de bobines individuels (5, 6, 7) qui peut être mis en place ou enclenché, respectivement, et par le fait que la bande de transport des supports de bobines (38) peut être divisée en diverses sections de déplacement qui sont séparées les unes des autres par des organes d'arrêt du transport choisis de différentes manières.
  2. Bobinoir automatique selon la revendication 1, caractérisé par le fait qu'un poste d'alimentation (76, 79) est disposé au moins à l'une des extrémités de la bande de transport des supports de bobines (38).
  3. Bobinoir automatique selon la revendication 1 ou 2, caractérisé par le fait qu'au moins un poste d'alimentation (77 ; 78) est disposé dans une section de déplacement de la bande de transport des supports de bobines (38) qui est située entre des têtes de bobinage (40, 41 ; 42, 43).
  4. Bobinoir automatique selon l'une des revendications 1 à 3, caractérisé par le fait qu'un organe d'arrêt du transport (81 à 84) qui peut être mis en place ou enclenché, respectivement, est à chaque fois disposé le long de la bande de transport des supports de bobines (38) entre toutes les têtes de bobinage (40 à 44).
  5. Bobinoir automatique selon l'une des revendications 1 à 4, caractérisé par le fait que les têtes de bobinage (40 à 44) sont réparties ou peuvent être réparties en sections (I, II) qui comprennent chacune plusieurs têtes de bobinage (40, 41, 42 ; 43, 44), et par le fait que les organes d'arrêt du transport (80 à 85) qui peuvent être mis en place ou enclenchés, respectivement, sont disposés aux limites des sections.
  6. Bobinoir automatique selon l'une des revendications 1 à 5, caractérisé par le fait qu'un organe d'arrêt du transport (80, 85) supplémentaire qui peut être mis en place ou enclenché, respectivement, est disposé à l'une au moins des extrémités de la bande de transport des supports de bobines (38).
  7. Bobinoir automatique selon l'une des revendications 1 à 6, caractérisé par le fait que les têtes de bobinage (40 à 44) ou leurs magasins (33 à 37) comprennent un moyen transporteur (33 à 37) qui se raccorde à la bande de transport des supports de bobines individuels (38) et qui produit la déviation automatique d'un support de bobine individuel (5, 7) amené dans une direction quelconque sur la bande de transport des supports de bobines individuels (38) lorsqu'il existe un besoin d'alimentation de la tête de bobinage concernée (40, 43).
EP89119891A 1988-12-23 1989-10-26 Bobinoir automatique avec bande transporteuse pour supports de bobines Expired - Lifetime EP0374431B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3843554 1988-12-23
DE19883843554 DE3843554C2 (de) 1988-12-23 1988-12-23 Spulautomat mit Spulenträgertransportband

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP93116227A Division EP0581334A2 (fr) 1988-12-23 1989-10-26 Bobinoir automatique
EP93116227.5 Division-Into 1993-10-07

Publications (3)

Publication Number Publication Date
EP0374431A2 EP0374431A2 (fr) 1990-06-27
EP0374431A3 EP0374431A3 (fr) 1992-02-19
EP0374431B1 true EP0374431B1 (fr) 1994-06-08

Family

ID=6370057

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89119891A Expired - Lifetime EP0374431B1 (fr) 1988-12-23 1989-10-26 Bobinoir automatique avec bande transporteuse pour supports de bobines
EP93116227A Ceased EP0581334A2 (fr) 1988-12-23 1989-10-26 Bobinoir automatique

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP93116227A Ceased EP0581334A2 (fr) 1988-12-23 1989-10-26 Bobinoir automatique

Country Status (5)

Country Link
US (1) US5078329A (fr)
EP (2) EP0374431B1 (fr)
JP (2) JP2693244B2 (fr)
DE (2) DE3844845C2 (fr)
ES (1) ES2054982T3 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4019100A1 (de) * 1990-06-15 1991-12-19 Schlafhorst & Co W Transporteinrichtung fuer voneinander unabhaengige paletten, die spulen oder spulenhuelsen tragen
DE4019475A1 (de) * 1990-06-19 1992-01-02 Schlafhorst & Co W Spulmaschine mit an einer bedienstelle etwa in tischhoehe angeordneten spulenaufnahmemitteln
DE4031502A1 (de) * 1990-10-05 1992-04-09 Zinser Textilmaschinen Gmbh Verfahren zum zufuehren von vollen vorgarnspulen zu mitteln zum aufnehmen an den spinnstellen einer spinnmaschine und zum abtransportieren der abgearbeiteten vorgarnspulen und vorrichtung
DE4131518A1 (de) * 1991-09-21 1993-03-25 Schlafhorst & Co W Transportsystem zum transport von einzeltraegern
DE4131608A1 (de) * 1991-09-23 1993-03-25 Schlafhorst & Co W Verfahren zum betreiben einer automatischen spulmaschine
DE4142790C2 (de) * 1991-12-23 2001-12-13 Schlafhorst & Co W Kopstransporteinrichtung in einem Spulautomaten
US5374000A (en) * 1992-01-30 1994-12-20 Murata Kikai Kabushiki Kaisha Cop changing mechanism for a winding unit
DE4205499A1 (de) * 1992-02-22 1993-08-26 Schlafhorst & Co W Sperre fuer spulen oder spulenhuelsen tragende, voneinander unabhaengige caddy's
DE4209219B4 (de) * 1992-03-21 2005-08-04 Saurer Gmbh & Co. Kg Spulmaschine mit einem geschlossenen Transportsystem für Spulentransportteller
DE4210815C2 (de) * 1992-04-01 2002-02-28 Schlafhorst & Co W Zuführeinrichtung für aufrechtstehende auf Spulentransportteller aufgesteckte Kopse zu den Spulstellen einer Spulmaschine
DE4211112C2 (de) * 1992-04-03 2002-02-14 Schlafhorst & Co W Vorrichtung zum Beliefern eines Spulautomaten mit aufrechtstehend auf Spulentransportteller aufgesteckten Kopsen
ITMI20012421A1 (it) * 2001-11-16 2003-05-16 Savio Macchine Tessili Spa Dispositivo e procedimento per depurare il filo della bobina di alimentazione ad una roccatice automatica dai suoi tratti terminali difettos
IT1403277B1 (it) * 2010-12-20 2013-10-17 Savio Macchine Tessili Spa Dispositivo e procedimento per il controllo e l'alimentazione ad una roccatrice automatica di spole provenienti alla rinfusa dalla filatura
DE112018001551T5 (de) * 2017-03-21 2019-12-19 Murata Machinery, Ltd. Fadenwickelvorrichtung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4912128B1 (fr) * 1970-12-30 1974-03-22
JPS5859167A (ja) * 1981-09-25 1983-04-08 Murata Mach Ltd 管糸搬送システム
JPS58157678A (ja) * 1982-03-13 1983-09-19 Murata Mach Ltd 自動ワインダ−における管糸搬送システム
JPS5917464A (ja) * 1982-07-19 1984-01-28 Murata Mach Ltd 異種管糸の搬送システム
JPS5978074A (ja) * 1982-10-26 1984-05-04 Murata Mach Ltd 異種管糸のワインダへの供給装置
JPS6048871A (ja) * 1983-08-29 1985-03-16 Murata Mach Ltd 物品の搬送処理システム
DE3504883A1 (de) * 1985-02-13 1986-08-14 W. Schlafhorst & Co, 4050 Mönchengladbach Verfahren und vorrichtung zum beschicken eines spulautomaten mit kopsen
DE3622004A1 (de) * 1985-09-06 1987-03-19 Schlafhorst & Co W Spulautomat
DE3637172A1 (de) * 1986-10-31 1988-05-05 Schlafhorst & Co W Verfahren und vorrichtung zum erhoehen der spulgeschwindigkeit eines spulautomaten

Also Published As

Publication number Publication date
DE3844845C2 (de) 1994-03-31
EP0374431A2 (fr) 1990-06-27
JPH09208127A (ja) 1997-08-12
ES2054982T3 (es) 1994-08-16
JPH02243478A (ja) 1990-09-27
JP2693244B2 (ja) 1997-12-24
JP2774271B2 (ja) 1998-07-09
EP0374431A3 (fr) 1992-02-19
US5078329A (en) 1992-01-07
EP0581334A3 (fr) 1994-04-20
DE58907838D1 (de) 1994-07-14
EP0581334A2 (fr) 1994-02-02

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