EP0067279B1 - Tube d'aspiration pivotable pour la préhension d'un fil sur une bobine - Google Patents

Tube d'aspiration pivotable pour la préhension d'un fil sur une bobine Download PDF

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Publication number
EP0067279B1
EP0067279B1 EP82102807A EP82102807A EP0067279B1 EP 0067279 B1 EP0067279 B1 EP 0067279B1 EP 82102807 A EP82102807 A EP 82102807A EP 82102807 A EP82102807 A EP 82102807A EP 0067279 B1 EP0067279 B1 EP 0067279B1
Authority
EP
European Patent Office
Prior art keywords
thread
suction pipe
stop
slide
slot
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
Application number
EP82102807A
Other languages
German (de)
English (en)
Other versions
EP0067279B2 (fr
EP0067279A1 (fr
Inventor
Rupert Karl
Walter Mayer
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.)
Rieter Ingolstadt Spinnereimaschinenbau AG
Original Assignee
Schubert und Salzer 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6134512&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0067279(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Schubert und Salzer Maschinenfabrik AG filed Critical Schubert und Salzer Maschinenfabrik AG
Publication of EP0067279A1 publication Critical patent/EP0067279A1/fr
Application granted granted Critical
Publication of EP0067279B1 publication Critical patent/EP0067279B1/fr
Publication of EP0067279B2 publication Critical patent/EP0067279B2/fr
Expired 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
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/48—Piecing arrangements; Control therefor
    • 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
    • B65H54/22—Automatic winding machines, i.e. machines with servicing units for automatically performing end-finding, interconnecting of successive lengths of material, controlling and fault-detecting of the running material and replacing or removing of full or empty cores
    • B65H54/26—Automatic winding machines, i.e. machines with servicing units for automatically performing end-finding, interconnecting of successive lengths of material, controlling and fault-detecting of the running material and replacing or removing of full or empty cores having one or more servicing units moving along a plurality of fixed winding units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H67/00—Replacing or removing cores, receptacles, or completed packages at paying-out, winding, or depositing stations
    • B65H67/08—Automatic end-finding and material-interconnecting arrangements
    • B65H67/081—Automatic end-finding and material-interconnecting arrangements acting after interruption of the winding process, e.g. yarn breakage, yarn cut or package replacement
    • B65H67/085—Automatic end-finding and material-interconnecting arrangements acting after interruption of the winding process, e.g. yarn breakage, yarn cut or package replacement end-finding at the take-up package, e.g. by suction and reverse package rotation
    • 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 pivotable suction tube for receiving a thread from a bobbin, which has a longitudinally extending slot on its side facing the bobbin for transferring a thread to a working element, to which a controllable closure piece is assigned.
  • a suction tube for automatically taking up the thread from the bobbin, which can be pivoted into the immediate vicinity of the bobbin.
  • the suction tube has a longitudinal slot on its side facing the bobbin, so that a section of the thread sucked into the suction tube leaves it through the longitudinal slot in the manner of a chord, so that it is accessible to and from working organs that are involved in the piecing process this can be recorded (DE-A-2 008 142).
  • this slot has the disadvantage that a very large negative pressure must be generated because of the large negative pressure loss through the slot, so that the thread is safely taken up by the bobbin and sucked into the suction tube. A strong vacuum source with high power consumption is therefore required.
  • the object of the present invention is to create a suction tube for receiving a thread from a bobbin and for its defined transfer to a working organ, which works safely, quickly and with little effort.
  • the closure piece is designed as a slide which can be moved transversely to the longitudinal slot.
  • the longitudinal slot in the suction tube can remain closed while the thread is being picked up and extracted from the bobbin, so that the air requirement is low. If the suction tube has sucked a sufficient length of thread from the bobbin, the closure piece is removed from the longitudinal slot so that it is released. Due to the thread tension generated by the vacuum, the thread section located in the area of the longitudinal slot now leaves the suction tube and takes the shortest course between the bobbin and the slot end. The thread automatically reaches the area of a work organ without additional aids.
  • closure piece which is designed as a slide, is displaced both transversely to the longitudinal slot and transversely to the thread running plane in which the thread emerging from the slot of the suction tube moves, it is ensured that the closure piece is never in the course of the thread - that through the slot end as well the point at which the thread reaches the bobbin is defined.
  • the suction pipe advantageously has a pipe section with an axially symmetrical shape, while the closure piece in the region of the pipe section is designed as a rotary slide valve provided with an axial slot.
  • the rotary valve preferably surrounds this pipe section.
  • the axial slot in the rotary slide valve is wider than the longitudinal slot in the tube section in order to be able to maintain large tolerances in the adjustment paths for the closure piece designed as a rotary slide valve with reliable function.
  • the end of the closure piece facing the bobbin is expediently mounted in a groove of the suction tube.
  • the thread is guided in the longitudinal slot of the non-adjustable part of the suction tube on both sides of the closure piece and is thus prevented from following the movement of the closure piece, which then ensures that the thread is not carried along between the non-adjustable suction tube and the closure piece .
  • the closure piece can be driven in various ways, for example by a single drive which acts in two directions.
  • the closure piece is expediently provided with an elastic element, e.g. a spring, which holds it in its closed position defined by a stop when released by its actuator.
  • an elastic element e.g. a spring
  • the closure piece carries a stop to which a counter-stop which becomes effective as a function of the pivoting movement of the suction tube is assigned.
  • the open-end spinning machine 1 is assigned a piecing device 2 which can be moved along the machine.
  • FIG. 1 shows a spinning station shown only with its parts essential for understanding the invention.
  • Each of these spinning stations has a spinning device 10, from which the thread 5 produced there is drawn off through a draw-off tube 100 with the aid of draw-off rollers 11/12.
  • the thread 5 is wound up during normal spinning operation with the aid of a traversing thread guide 17 onto a bobbin 13 which is rotatably carried between two bobbin arms 14 and is driven 15 by being supported on a drive shaft.
  • the thread tension 16 is registered in the thread path 16 and the drop in the thread tension is registered and the fiber feed is switched off in the spinning device 10.
  • a coil support element 18 is pushed between the drive shaft 15 and the coil 13, so that the coil 13 is stopped.
  • the piecing device 2 has, in addition to other elements not explained here, a pivotable suction tube 3, the end of which facing the coil 13 is formed in the form of a gap and extends over the entire width of the coil 13.
  • This gap-like cross section of the thread receiving part 31 merges into a round cross section which extends over the main part 30 of the suction pipe 3.
  • the end of this tube section forming the main part 30 facing away from the coil 13 is connected directly or via an articulated intermediate piece 40 to an intake port 4 which is stationary with respect to the piecing device 2 and which in turn is connected to a vacuum source (not shown).
  • the intake manifold 3 is assigned a swivel drive which has a swivel lever 41 holding the intake manifold 3 and a drive rod 42 which are connected to one another via a coupling member 43.
  • the thread receiving part 31 is arranged at an angle to the cylindrical main part 30, the main part 30 and the thread receiving part 31 being connected to one another in a rotationally fixed manner.
  • the thread receiving part 31 and the main part 30 have a continuous longitudinal slot 32.
  • the main part 30 is surrounded by a sleeve forming a rotary slide 33, which has an axial slot 330 over its entire length.
  • the rotary valve 33 has at its end facing away from the coil 13 a flange 331 in which one end of a torsion spring 34 is anchored.
  • the other end of the torsion spring 34 is anchored in a flange 300 carried by the main part 30 of the suction pipe 3.
  • the rotary slide 33 carries a stop 333 designed as a roller on a radial arm 332, to which a stationary stop 20 in the piecing device 2 is assigned. This assignment is made in such a way that the stop 333 runs up to the stop 20 in the last part of its movement from the thread take-up position shown in full line in FIG. 1 to its stop position shown in dashed lines and the rotary slide 33 counter to the action of the torsion spring 34 in FIG 2 rotated position, in which the axial slot 330 releases the longitudinal slot 32.
  • the rotary slide 33 At its end facing the thread receiving part 31 of the suction tube 3, the rotary slide 33 has a radially projecting stop 334, to which a stop 310 on the thread receiving part 31 is assigned.
  • the thread receiving part 31 has no cylindrical shape, since it has a mouth that extends over the entire bobbin width, so that as a closure piece no rotary valve can be used as in the main part 30.
  • the thread receiving part 31 therefore has a guide surface in the area around the longitudinal slot 32, along which a slide 35 can be displaced perpendicular to the course of the longitudinal slot 32.
  • the slide 35 is guided in a holder 36 (FIG. 2) carried by the suction pipe 3, to which the pivot lever 41 is also articulated.
  • the slide 35 is acted upon in the closing direction by a compression spring 360 supported on the holder 36.
  • a fork 351 which also serves as a stop and carries a stop 352 designed as a roller, is connected to the slide 35 via a guide pin 350.
  • the pivot lever 41 carries a stop 410 designed as a control wedge, which is arranged on the pivot lever 41 such that the stop 410 engages in the last part of the movement of the suction tube 3 from its thread take-up position into the starting position on the side of the stop 352 facing the slide 35 and this and thus also moves the slide 35 so far that the longitudinal slot 32 is released.
  • This piecing device 2 has, inter alia, a spool lifting arm 21, which is pivotally mounted and can be brought into contact with the spool arm 14.
  • the piecing device 2 also has a pair of feed rollers 22, which is pivotably supported by means of a swivel arm 220 in such a way that when it swivels, it can grasp the thread 5 emerging from the suction pipe 3 and bring it exactly up to the take-off pipe 100.
  • the piecing device 2 is now called in a known manner to the spinning station concerned, where it lifts the bobbin 13 from the bobbin support element 18 with the aid of the pivotable bobbin lifting arm 21.
  • the suction pipe 3 is pivoted in the direction of the coil 13 up to its immediate vicinity.
  • the stops 333 and 352 are released by the stops 20 and 410, so that the slide 35 and the rotary slide 33 close the longitudinal slot 32 of the suction pipe 3 under the action of the springs 34 and 360.
  • the stop 334 and the fork 351 come to rest against the stop 310 or the holder 36.
  • the suction pipe 3 is connected to a vacuum source, while the coil 13 is driven in a manner not shown in the unwinding direction.
  • the suction air flow acting in the thread receiving part 31 of the suction tube 3 detects the thread end and pulls the thread 5 released by turning the spool 13 back into the suction tube 3. Since the longitudinal slot 32 of the suction pipe 3 is closed, no negative pressure is lost, so that the entire negative pressure applied to the suction pipe 3 becomes effective at the mouth of its thread-receiving part 31.
  • a sufficient length of thread 5 has been drawn off - which is controlled in a known manner, for example by the number of revolutions of the bobbin 13 or its drive in the unwinding direction - the suction tube 3 is moved from its thread take-up position shown in full line in FIG. 1 to its starting position (dashed lines) shown) pivoted back.
  • the stop 333 runs onto the stop 20 which is stationary with respect to the piecing device 2, while the stop 352 runs onto the stop 410, which is carried as a control wedge and is carried by the pivoting lever 41, which, if desired, can also be done in a time-graded manner.
  • This run-up of the stops 333 and 352 releases the longitudinal slot 32 from the slide 35 and from the rotary slide 33, which together form a subdivided closure piece.
  • the thread 5 emerges from the longitudinal slot 32 in an attempt to take the shortest path between the bobbin 13 and the end of the longitudinal slot 32 facing away from the bobbin 13, while the free end of the thread extends into the suction nozzle 4 and thus in the suction pipe 3 is kept safe.
  • the thread section located outside the suction tube 3 now assumes the position 5 ', in which it is located in the swivel range of the pair of feed rollers 22, which picks up the thread 5 by pivoting and, after severing by means of a separation device (not shown), feeds it to the draw-off tube 100 of the spinning device 10.
  • Known thread guide members prevent premature contact with the take-off rollers 11/12.
  • the separated thread end is removed by the vacuum acting in the suction pipe 3.
  • the thread 5 is returned to the collecting surface of the spinning element (not shown) forming part of the spinning device 10, whereupon the thread 5 is released by spreading and pivoting back the feeder roller pair 22 becomes.
  • the fiber feed into the spinning element is released in a known manner and the bobbin 13 is lowered onto the bobbin support element 18 by lowering the bobbin lifting arm. This is now withdrawn, so that the bobbin 13 is driven again in the winding direction and the thread 5 again in the working area of the traversing thread guide 13 and due to the restored thread tension reaches the nip line of the take-off rollers 11/12.
  • the suction air in the suction pipe 3 is now also turned off. The piecing process is now complete.
  • the closure piece can, as the above description shows, be designed differently. Its shape also largely depends on the shape of the suction pipe 3. It can e.g. a single closure piece can be provided, which extends over the entire length of the longitudinal slot 32.
  • a closure piece for this thread receiving part 31 may also be dispensed with, so that a single slide, preferably a rotary slide valve, is sufficient for the main part 30 of the suction tube 3. It is not even necessary for this main part to have a cylindrical shape; other axisymmetric shapes, e.g. Cones with low taper or composite bodies with circular cross sections are also possible. With this axisymmetric shape, the design of the closure piece as a rotary slide 33 - with an axial slot 330 - is possible, which has advantages in terms of manufacture, storage and guidance on the intake manifold 3.
  • the rotary slide 33 is designed as a jacket surrounding the main part 30 of the suction pipe 3, since it is then particularly easy to actuate the rotary slide 33.
  • the closure piece (slide 35 and / or rotary slide 33) can be controlled in various ways by a stationary stop 20 or by a stop 410 arranged on the linkage of the suction pipe 3, which is activated by the pivoting movement of the suction pipe 3; but it is also possible to provide other drives for the adjustment of the closure piece. This can act on the closure piece in both directions, e.g. in the form of an electromagnet or a hydraulic or pneumatic piston. However, it is also possible that the drive controls only one movement and that the closure piece (slide 35, rotary slide 33) is acted upon by a spring (34, 360) or another elastic element which, when released by its drive (e.g.
  • This elastic element can then be attached in any way between the suction pipe 3 and the slide 35 or rotary slide 33, e.g. as compression spring or tension spring between extension arms or as torsion spring etc.
  • the closure piece is mounted in a groove 37 or 38.
  • this groove 38 is formed by turning the mouth of the thread receiving part 31 inside out, so that the slide 35 is guided between the thread receiving part 31 itself and the inside out 311.
  • this groove 37 is formed between the main part 30 of the suction tube 3, which is non-rotatably connected to the thread take-up part 31, and an annular projection 312 of the thread take-up part 31.
  • both the inverted portion 311 and the annular projection 312 are also slotted in accordance with the longitudinal slot 32 of the suction pipe 3.
  • the thread 5 rests on the end of the closure piece (slide 35 or rotary slide 33) facing the bobbin 13, the thread 5 becomes on both sides of the closure piece by the thread receiving part 31 as well as its inversion 311 or the main part 30 of the suction tube 3 and the projection 312 of the thread receiving part 31 out. If the closure piece is thus moved relative to the suction tube 3, the thread 5 is prevented by this closure guide on both sides from following the movement of the closure piece, thereby also preventing the thread 5 from being jammed between the closure piece and the suction tube 3. Since the thread 5 is severed and the separated thread end is removed when the thread 5 in position 5 'is taken over by the feed roller pair 22, the thread 5 cannot be pinched by the closure piece even when the longitudinal slot 32 is closed.
  • the subject matter of the invention also offers the advantage that the thread 5 is not released at an undesired point in time and can be pulled out of the suction pipe 3 by external influences or can thus be somehow impaired since it if he is to be taken over by another work organ, is supplied to the work area of this work organ by releasing the longitudinal slot 32.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)

Claims (7)

1. Tube d'aspiration pivotable pour la préhension d'un fil sur une bobine et qui, pour transmettre ce fil à un organe fonctionnel, comporte sur son côté tourné vers la bobine une fente orientée dans le sens longitudinal avec laquelle coopère un organe obturateur commandé, caractérisé en ce que cet organe obturateur (33, 35) a la conformation d'un tiroir déplaçable perpendiculairement à la fente longitudinale (32).
2. Tube d'aspiration selon la revendication 1, caractérisé en ce que ce tube (3) comporte une partie tubulaire (30) de forme symétrique par rapport à son axe et l'organe obturateur (33) a, à hauteur de cette partie (30), la conformation d'un tiroir rotatif présentant une fente axiale (330).
3. Tube d'aspiration selon la revendication 2, caractérisé en ce que le tiroir rotatif (33) entoure la partie tubulaire (30).
4. Tube d'aspiration selon la revendication 2 ou 3, caractérisé en ce que la fente axiale (330) du tiroir rotatif (33) est plus large que la fente longitudinale (32) de la partie tubulaire (30).
5. Tube d'aspiration selon l'une ou plusieurs des revendications 1 à 4, caractérisé en ce que l'extrémité de l'organe obturateur tournée vers la bobine (13) est logée dans une rainure (37, 38) de ce tube (3).
6. Tube d'aspiration selon l'une ou plusieurs des revendications 1 à 5, caractérisé en ce que l'organe obturateur est sollicité par un élément élastique (34, 360) qui le maintient dans sa position d'obturation définie par une butée (310, 351).
7. Tube d'aspiration selon l'une ou plusieurs des revendications 1 à 6, caractérisé en ce que l'organe obturateur porte une butée (333, 352), avec laquelle coopère une butée opposée (20, 410) que le mouvement de pivotement de ce tube rend efficace.
EP82102807A 1981-06-12 1982-04-02 Tube d'aspiration pivotable pour la préhension d'un fil sur une bobine Expired EP0067279B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3123282 1981-06-12
DE3123282A DE3123282C1 (de) 1981-06-12 1981-06-12 Vorrichtung zur Aufnahme eines Fadens von einer Spule und UEbergabe an ein Arbeitsorgan

Publications (3)

Publication Number Publication Date
EP0067279A1 EP0067279A1 (fr) 1982-12-22
EP0067279B1 true EP0067279B1 (fr) 1985-07-24
EP0067279B2 EP0067279B2 (fr) 1989-06-07

Family

ID=6134512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102807A Expired EP0067279B2 (fr) 1981-06-12 1982-04-02 Tube d'aspiration pivotable pour la préhension d'un fil sur une bobine

Country Status (10)

Country Link
US (1) US4463548A (fr)
EP (1) EP0067279B2 (fr)
JP (1) JPS57209174A (fr)
BR (1) BR8203403A (fr)
CS (1) CS274258B2 (fr)
DE (1) DE3123282C1 (fr)
GB (1) GB2100298B (fr)
HK (1) HK42385A (fr)
IN (1) IN156433B (fr)
MY (1) MY8600113A (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH663428A5 (de) * 1983-05-21 1987-12-15 Schlafhorst & Co W Verfahren und vorrichtung zur inbetriebnahme einer friktionsspinnmaschine.
CS257672B1 (en) * 1986-03-03 1988-05-16 Frantisek Burysek Device for yarn spinning-in on spindleless spinning frame
DE102014012419A1 (de) * 2014-08-21 2016-02-25 Saurer Germany Gmbh & Co. Kg Arbeitsstelle einer Kreuzspulen herstellenden Textilmaschine
EP3489399B1 (fr) * 2017-11-27 2021-06-09 Savio Macchine Tessili S.p.A. Métier à filer à bout libre avec une bouche d'aspiration pour l'élimination du fil améliorer et méthode de raccord correspondant

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432722A (en) * 1945-07-12 1947-12-16 Foster Machine Co Winding machine
US3136494A (en) * 1956-10-18 1964-06-09 Reiners Walter Method and means for preparing spinning cops for rewinding
US3077312A (en) * 1959-06-12 1963-02-12 Reiners Walter Yarn-coil winding machine
US3131879A (en) * 1961-07-13 1964-05-05 Glastra Yarn winding machine
US3343756A (en) * 1964-09-01 1967-09-26 Hayashi Junichi Suction means for retrieving a yarn end from a supply cop for automatic winding machines
US3595493A (en) * 1967-08-19 1971-07-27 Kamitsu Seisakusho Ltd Device for use with yarn clearer automatic winders
AT306585B (de) * 1967-09-09 1973-04-10 Elitex Zavody Textilniho Serviceeinrichtung für automatische Spulmaschinen
GB1175929A (en) * 1967-11-04 1970-01-01 Harilaos Theochari Hadjikokolo Transportation Apparatus for Bulk Liquids
CH508745A (de) * 1969-02-25 1971-06-15 Toyoda Automatic Loom Works Verfahren zum automatischen Anspinnen eines Fadens nach einem Fadenbruch an einer Spinnstelle einer ringlosen Spinnmaschine und Spinnmaschine zu dessen Durchführung
JPS4926496U (fr) * 1972-06-07 1974-03-06
JPS5130953Y2 (fr) * 1972-06-08 1976-08-03
DE2620805C2 (de) * 1976-05-11 1986-02-13 W. Schlafhorst & Co, 4050 Mönchengladbach Verfahren und Vorrichtung zum Anspinnen eines Fadens
DE2647048A1 (de) * 1976-10-19 1978-04-27 Schlafhorst & Co W Vorrichtung zum ruecktransport des fadenendes einer auflaufspule zum abzugsrohr einer rotorspinnmaschine
JPS5621715A (en) * 1979-07-20 1981-02-28 Seiko Seiki Co Ltd Beveling device
JPS57121566A (en) * 1981-01-19 1982-07-29 Murata Mach Ltd Spun-yarn joining device

Also Published As

Publication number Publication date
US4463548A (en) 1984-08-07
EP0067279B2 (fr) 1989-06-07
EP0067279A1 (fr) 1982-12-22
BR8203403A (pt) 1983-05-31
CS274258B2 (en) 1991-04-11
JPS57209174A (en) 1982-12-22
GB2100298B (en) 1984-11-14
HK42385A (en) 1985-06-07
IN156433B (fr) 1985-08-03
DE3123282C1 (de) 1988-12-22
MY8600113A (en) 1986-12-31
GB2100298A (en) 1982-12-22
CS435582A2 (en) 1990-09-12

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