EP0036002A1 - Dispositif de commande de la vitesse de rotation des broches d'un banc a broches. - Google Patents

Dispositif de commande de la vitesse de rotation des broches d'un banc a broches.

Info

Publication number
EP0036002A1
EP0036002A1 EP80901721A EP80901721A EP0036002A1 EP 0036002 A1 EP0036002 A1 EP 0036002A1 EP 80901721 A EP80901721 A EP 80901721A EP 80901721 A EP80901721 A EP 80901721A EP 0036002 A1 EP0036002 A1 EP 0036002A1
Authority
EP
European Patent Office
Prior art keywords
spindles
spindle
switching
correction
coil
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.)
Granted
Application number
EP80901721A
Other languages
German (de)
English (en)
Other versions
EP0036002B1 (fr
Inventor
Emil Briner
Peter Novak
Hermann Gasser
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 EP0036002A1 publication Critical patent/EP0036002A1/fr
Application granted granted Critical
Publication of EP0036002B1 publication Critical patent/EP0036002B1/fr
Expired legal-status Critical Current

Links

Classifications

    • 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
    • D01H1/20—Driving or stopping arrangements
    • D01H1/32—Driving or stopping arrangements for complete machines
    • D01H1/34—Driving or stopping arrangements for complete machines with two or more speeds; with variable-speed arrangements, e.g. variation of machine speed according to growing bobbin diameter

Definitions

  • the present invention relates to a device for controlling the speed of the spindles of a pre-spinning machine equipped with spindles and associated blades in function of the growing spool diameter with a variably adjustable variator for driving the spindles by means of a step-by-step shifting shaft.
  • a fiber sliver is produced and wound on the spool of each spinning station with a wing with parallel windings. Since the fiber sliver must be deformable for feeding the next processing stage, a very massive rotation is given, which is just enough to feed the fiber sliver without tension to a drafting system of the subsequent processing stage, but results in an undesirable misalignment in the ventilation at the slightest tensile stress.
  • the vane normally rotates at a constant speed, while the speed of the spindle is adjusted according to the growing diameter of the spool: for this purpose, the spindle executes the spindle bench stroke between two reversing points that move spatially depending on the spool diameter, with which it is ensured that the The fiber is wound with parallel windings on the surface of the spool, and that the spool extremities acquire a conical shape.
  • This invention is concerned with the problem of adapting the spindle speed to the growing spool diameter, while the shortening of the spindle bench stroke as a function of the spool diameter is not affected by it.
  • the increase in the coil diameter depends crucially on the technological properties of the fuse, e.g. Fiber quality, number, twist, volume, etc., from.
  • the volume of such a fuse, or its cross-section is climate-dependent, i.e. that it can fluctuate over time, and that even such minimal fluctuations are already a disruptive factor in the wind-up process, which must be corrected with the appropriate means.
  • Another disadvantage of the known device is that it requires a high level of maintenance, in particular cleaning and lubrication work.
  • Another disadvantage of such a device is that the regulating devices must be equipped with special resetting devices, by means of which e.g. the belt of the double cone drive must be returned to the initial position when the machine is at a standstill after relieving the belt.
  • a relief device for the cones and a separate return servomotor which only comes into action during the very short reset operation, are necessary, which makes the device even more complicated and expensive.
  • the spindle speed is controlled so that the sliver tension remains constant (e.g. according to FR-PS 815 560), which presupposes that the sliver tension is measured.
  • the purpose of the present invention is to remedy the mentioned disadvantages of the known devices and to propose a device of the type mentioned above, in which in particular
  • the spindle speed can be set while the machine is running
  • the device is easy to use, poor in maintenance work and no separate restoring devices are required.
  • a device for controlling the speed of the spindles of a roving machine equipped with spindles and associated wings in function of the growing spool diameter with a variably adjustable variator for driving the spindles by means of a step-by-step shifting shaft in that the shifting shaft also an electrical receiving the switching pulses from a motor controller Adjustment motor is driven, the motor controller a programmable setpoint generator, which can be set from the outside to a certain number of switching pulses per switching step, and an adjustable correction element, with which the determined on the setpoint generator
  • Pulse number can be corrected by summing or subtracting correction pulses at each switching step, and that the command to issue switching pulses to the motor controller is issued by an apparatus which scans the reversal points of the spindle bank stroke, while the setpoint generator and / or the correction element is used with one apparatus determining the growing coil diameter are in control connection.
  • Variators by means of an adjusting motor create the conditions for achieving the advantages mentioned above, as will be explained in more detail with reference to the exemplary embodiments of the invention described below.
  • FIG. 1 shows an overall view of a roving machine with the control device according to the invention
  • FIG. 2 shows a block diagram of a device according to the invention for controlling a roving machine, as shown in FIG. 1; and
  • Fig. 3 is a block diagram of a variant of the device according to the invention for controlling a roving machine, as shown in Fig. 1.
  • a pre-spinning machine equipped with spindles and associated wings is shown schematically and simplified with its working elements necessary for the understanding of this invention.
  • Such a roving machine has, in one or more rows on a spindle bench 1, rotatably mounted spindles 2, of which only one is shown in the figure.
  • the spindle bench 1 performs a vertical upward and downward movement and is guided for this purpose in vertical guides (not shown) and coupled with a lifting mechanism which is only shown schematically here.
  • the spindle bench 1 is in at least two locations (only one is shown in FIG. 1) with one of the vertical strands between an upper deflection roller 4 and a lower guide roller 5 revolving chain 3 attached.
  • One of the rollers 4 and 5 is driven alternately in both directions of rotation with a system which is not shown here and is otherwise known, so that the spindle bench 1 executes an alternating up and down movement, as indicated by the arrow m.
  • the choice of the lifting mechanism for the vertical movement of the spindle bank 1, which is necessary for the distribution of the fiber sliver on the surface of the spool, is irrelevant in the context of this invention; it is only essential that the reversal of the vertical movement is carried out by means of an apparatus which scans the spindle bench deflection stroke, as will be explained below shall be.
  • the machine can be equipped with a lifting mechanism for a constant stroke, with which the coils are produced with cylindrical ends, or for a stroke which decreases in function of the coil diameter, with which coils with conical ends are produced.
  • the solution with the decreasing stroke was chosen here, since this corresponds to the usual case in the spinning mill.
  • the solution described here can also be used with advantage, as will become clear in the course of the description, also advantageously in a roving machine with a constant stroke.
  • a spool 6 On the spindle 2 there is a spool 6 on which the fiber sliver is wound.
  • a wing 7 is rotatably mounted coaxially with each spindle 2 in a fixed wing bench 8.
  • the roving machine shown here thus has so-called “suspended” wings 7; however, this is also not a necessary condition in the context of the invention: this would be the case with any other known solution of roving machines (for example with a wing "placed” on the spindle, with so-called “closed” wings, ie those which are only supported above but not driven) , etc.) readily applicable.
  • the sliver 14 coming from a can 13 is drawn to a desired fineness in the drafting device 9 to 12 and then, in a known manner and with the granting of rotation, is fed to the wing 7 and finally to the bobbin 6 of the spindle 2.
  • control of the winding conditions on the coil 6 plays, ie the precise control of the speed of the work organs, an extraordinary role, since the winding of the fiber sliver 14, which does not tolerate any tensile stress and comes out of the cylinders 9 and 11, must be tension-free over the whole bobbin or under a very small, controlled tension.
  • the present invention relates to a device for controlling these wind conditions.
  • An electric motor 15 drives the main shaft 16 at a constant speed.
  • On this main shaft 16 is a conical gear 17, which is in engagement with the conical gear 18 of a vertical shaft 19.
  • the shaft 19 rotatably supports a belt pulley 20 for a belt 21 which sets the belt 7 in rotation by means of a belt pulley 22 placed on the wing 7.
  • the shaft 19 rotates stationary in space, while the spindle bench 1 performs the previously described up and down movement (according to arrow m); for this reason, the spindle bench 1 has a wide bore 23 for the shaft 19.
  • Fig. 1 the lowest position la of the spindle bench 1 is shown in dashed lines.
  • the shaft 19 carries a conical gearwheel 24, with which a conical gearwheel 25 is in engagement for driving the drafting device 9 to 12 of the prespinning machine.
  • the continuous cylinders 9 and 10 of the drafting system are supported in the supports 26 and 27, which are firmly connected to the wing bench 8; the support 27 is further designed as a gear, ie also contains the gears (not shown) for transmitting the rotary movement of the gear 25 to both (or all) cylinders 9 and 10 of the drafting system, taking into account the speed difference required between the 2 cylinders 9 and 10 according to the delay.
  • the wing 7 and the drafting system are therefore always driven synchronously with one another, since they are rigidly connected kinematically.
  • This invention is based on the above finding that (without direct measurement of the sliver tension) correct control of the spindle speed only as a combination of a basic control which calculates the mean values of the technological parameters (number of the sliver, fiber properties, ie fineness, degree of maturity, crimp, etc.) carries, and a correction control that is finely adjustable over the entire coil structure is possible.
  • a basic control which calculates the mean values of the technological parameters (number of the sliver, fiber properties, ie fineness, degree of maturity, crimp, etc.) carries, and a correction control that is finely adjustable over the entire coil structure is possible.
  • the output shaft 29 of the variator 28 rotates at a regulated speed and drives the spindle 2 via an angular gear 30/31, a vertical shaft 32, a pulley 33, a belt 34, a whorl 35.
  • Both the belt 21 and the belt 34 are preferably non-slip toothed belts, and in this case the pulleys 20, 22 and 33 and the whorl 35 are equipped with a suitable toothing.
  • the rotational speed of the spindle 2 is adapted to the existing winding conditions at any moment by appropriate adjustment of the infinitely variable variator 28, the variator 28 being able to be adjusted with a step-by-step shifting shaft 36, the control of which relates to the actual object of the invention.
  • the shift shaft 36 which is gradually rotated further, is driven by means of a servo motor 39 which receives the switching pulses from a motor control 37 via an electrical line 38.
  • the gradual rotation of the selector shaft 36 is due to the layer-by-layer deposition of the sliver windings on the coil surface, which requires a gradual adjustment of the spindle speed in accordance with the sudden increase in the coil diameter.
  • the selector shaft 36 carries a belt pulley 40 for a toothed belt 41, by means of which the belt pulley 42 of an apparatus 47 consisting of worm wheel 43, toothed wheel 44 and template 45 with toothed rack 46 is driven for determining the coil diameter.
  • the apparatus 47 further includes a contactor 48 which can be brought into successive contact with a plurality of contact takers 49 lying along the movement path of the contactor 48. Via the line 50, the contact takers 49 are connected to the motor control 37 in such a way that the position of the contact transmitter 48 can be transmitted to the majority of the contact takers 49 'of the motor control 37.
  • the operation of the apparatus 47 for example described here, for determining the coil diameter is now as follows: If the coil 6 is empty, i.e. if an empty sleeve (not shown) is present on the spindle 2, the variator 28 is in its initial position, since in this position the spindle 2 must assume one of its extreme speeds. In this position, the template 45, which is rigidly connected kinematically to the switching shaft 36 of the variator 28, is also arranged in its extreme position on the right, so that the contactor 48 is in contact with the right-hand contact 49a; Via the line 50 the motor control 37 is given a signal which corresponds to this initial position or the smallest coil diameter.
  • the variator 28 When the diameter of the coil 6 increases, the variator 28 has to be adjusted, which is done by gradually turning the selector shaft 36: due to the rigid coupling shown between the selector shaft 36 and the template 45, or contactor 48, each position of the selector shaft 36 or of the variator 28, a specific position of the template 45, since each position of the variator 28 corresponds to a specific coil diameter.
  • the result of this is that each layer of the template 45 also corresponds to a specific coil diameter.
  • the apparatus 47 is therefore able to the line 50 of the motor control 37 to emit a signal which corresponds to the current coil diameter or the current range of the coil diameter in accordance with the division of the contactors 49 over the path of the contactor 48.
  • Apparatus 47 for determining the coil diameter is not the only one which can be considered in the context of this invention.
  • any apparatus which can determine the diameter or the diameter ranges can be used in the context of this invention.
  • direct scanning of the coils e.g. mechanically with direct contact with the same or e.g. optically contactless, can be used without further ado, since the only condition is that a signal is to be emitted via the electrical line 50 to the motor control 37, which signal contains the information about the current diameter of the coil 6, optionally divided into a certain number of layers, contains.
  • the solution of the apparatus 47 shown has the particular advantage that, in addition to determining the instantaneous coil diameter, it can also control the spindle bench stroke during the coil build-up in order to achieve the desired coil 6 contour, as will now be shown.
  • the template 45 is used, which corresponds to a curve 51, equal to the desired profile of the coil 6 in cross-section (for example with two conical end parts).
  • a toggle switch 52 is attached to the spindle bench 1 and is switched over at the curve 51 at the top and bottom during the lifting movement of the spindle bench 1.
  • the toggle switch 52 thus gives the motor control 37, via the electrical line 53, at each reversal point of the spindle bankhubes a signal which is required for the control according to the invention, as will be explained later.
  • the overturning of the switch 52, via transmission elements (not shown) can reverse the lifting movement, ie the reversal of the chain 3; however, this is not a requirement in the context of this invention.
  • FIG. 1 Another embodiment of an apparatus which can also be used for determining the coil diameter is shown in broken lines in FIG. 1, but is no longer connected to the apparatus for scanning the reversal points. It is shown purely schematically how the shaft of the pulley 42 (or the switching shaft 36 directly) is coupled with a potentiometer 54; by rotating the switching shaft 36, the potentiometer 54 is thus also rotated further and further, each of its positions corresponding to a specific coil diameter. The potentiometer 54 is also connected to the motor control 3 by an electrical line 55 and gives it a signal which corresponds to the current coil diameter.
  • the structure of the motor control 37 according to the invention is contained in the block diagram of FIG. 2, the same elements of FIG. 1 having been given the same reference numbers.
  • the motor control 37 contains a programmable setpoint generator 56, which can be set from the outside to a certain number of switching pulses per switching step.
  • This relationship which, for example, the known mathematical, can be given by the geometric dimensions of the coil, must be regarded as a first approximation of the control function, which must be superimposed on a correction changing the function of the diameter of the coil structure. This must take into account the external influences on the coil formation, as mentioned in the introduction.
  • the setpoint generator can be set from the outside by the operating personnel.
  • the setpoint generator 56 works with the scanning of a template, the setpoint generator 56 must be arranged such that the replacement of the. Template or its adjustment by the operating personnel, without tools and without having to switch off the roving machine.
  • the setpoint generator 56 is connected to the line 50 by an electrical branch line 57: via this line 57 it receives signals from the apparatus 47 for the determination of the coil diameter which correspond to the coil diameter.
  • the setpoint generator 56 emits a certain number of switching pulses via the electrical line 58, a downstream logic 59.
  • the correction element 60 is also connected to the electrical line 50 and is thereby fed with a signal corresponding to the coil diameter. It supplies its correction pulses to logic 59 by means of electrical line 61.
  • the control device in FIGS. 1 and 2 now functions as follows:
  • the spindle bank 1 has reached one of the reversal points and thus actuates the toggle switch 52 (In addition to the signal for the reversal of the stroke on the lifting mechanism - signal, which is irrelevant here), the motor control 37, or its logic 59, sends a signal by means of the line 53.
  • the logic 59 simultaneously fetches the correction set for the relevant coil diameter, which consists of a specific number of negative or positive pulses.
  • the logic 59 sums up the pulses from the setpoint generator 56 and the correction element 60 and, via the line 38, outputs an adjustment signal to the adjustment motor 39 which corresponds to the current wind-up conditions.
  • the adjustment of the adjustment motor 39 is controlled with a feedback (containing a signal transmitter 62 and an electrical line 63, both shown in dashed lines), which establishes the connection between the motor 39 and the controller 37.
  • the control device for a roving machine described here has the great advantage that, thanks to the separation into a rough control with the setpoint generator 56 and a fine control with the correction element 60, it is convenient and extremely precise control of the spindle speed over the entire coil structure. Furthermore, it allows the use of any variator 28, since it does not prescribe a translation characteristic for the variator 28. This is a consequence of the programmability of the setpoint generator 56, which can be easily selected so that it can also take into account any translation characteristic of the variator 28.
  • both the setpoint generator 56 and the correction element 60 are freely accessible to the operating personnel, ie can be set without opening covers, for example on the drive head of the machine and with the roving machine running. This allows the operating personnel to carry out the necessary adjustment of the spindle speed without first disrupting the tension conditions in the fuse 14, which are to be corrected, by switching off the machine. It is known that a shutdown and start-up operation always exerts an influence on the roving tension, or on the winding tension, since this is strongly dependent on the centrifugal force and the air resistance.
  • a very interesting simplification of the control system according to the invention can be implemented with a further preferred embodiment variant of the invention, which provides that the variator 28 used has a transmission ratio over its control range, which with a linear adjustment is a first approximation of the known relationship between Spindle speed and spool diameter realized.
  • the variator 28 can be constructed such that if the selector shaft 36 always rotates the same amount, i.e. is adjusted linearly, the ratio between the speed of the main shaft 16 and that of the output shaft 29 in a first approximation equal to the non-linear known relationship between the spindle speed and the coil diameter. In this case, it is sufficient to set the setpoint generator 56 (FIG.
  • a control device is also advantageous, in which a so-called stepping motor is selected as the adjusting motor 39, ie a motor which rotates step by step always by an angle or amount corresponding to the switching impulses sent to it. With such a motor, there is then no need to use a signal transmitter 62 and electrical line 63 (FIG. 2). standing feedback since the motor is always adjusted by the correct angle.
  • a so-called stepping motor is selected as the adjusting motor 39, ie a motor which rotates step by step always by an angle or amount corresponding to the switching impulses sent to it.
  • Fig. 3 shows a particularly advantageous embodiment of the invention, in which the correction element consists of a known crossbar distributor 65, on which one of the coordinates, for example, as in Fig. 3, the abscissa a, the coil diameter D and the other, the ordinate b, which represents positive or negative pulse number correction b.
  • the contact points of the contact pickups 49 which are designed exactly the same as those of FIG. 1, are connected to the vertical rails of the crossbar distributor 65.
  • Each vertical rail thus corresponds to a precisely defined diameter range, or one layer, of the coil 6.
  • 6 rails are provided, ie the coil is divided into 6 cylindrical layers.
  • the horizontal rails of the crossbar distributor 65 are individually connected to the logic 59.
  • the scale b is divided into positive and negative values: above the O-line, the rails correspond to increasing positive corrections (e.g. positive pulse numbers, which, summed in logic 59 with those of the decade switch 64, increase the spindle speed compared to that which would correspond to the setpoint), while negative corrections can be set under the O-line.
  • the adjustment of the correction is made in such a crossbar distributor 65 in a known manner by establishing contact between the vertical and the horizontal rails, for example by means of contact pins 66.
  • a positive correction of +2 pulses is carried out, for example, in the first layer of the coil 6, one of 0 pulses in the second layer, one of +1 pulses in the third layer, etc.
  • a crossbar distributor 65 As a correction element, which of course can also have significantly more rails, is very convenient and clear for the operating personnel and suitable for graphically or, for example, with plug-in cards (cards on which the correction used in a particular case is fixed by perforating the cross points) in a specific case, adopt the correction for future use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Cleaning Or Drying Semiconductors (AREA)

Abstract

Dispositif de commande de la vitesse de rotation des broches (2) d'un banc a broches equipe de broches (2) et de volants (7). La commande proposee comprend un variateur (28) a reglage continu, lequel est regle par un axe de commande (36) tournant pas a pas. L'axe de commande (36) est entraine par un servo-moteur (39), qui recoit ses impulsions d'une commande (37) comprenant un ajusteur de la valeur de consigne programme et un moyen de correction (60). Dans une variante particulierement avantageuse, le moyen de correction (60) se presente sous la forme d'un repartiteur a barres croisees (65). Ce dispositif est tres commode pour l'operateur et permet entre autres un reglage extremement precis de la vitesse de rotation des broches. Cette operation de reglage peut se faire pendant la marche du banc a broches.
EP80901721A 1979-09-28 1981-04-08 Dispositif de commande de la vitesse de rotation des broches d'un banc a broches Expired EP0036002B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH876879 1979-09-28
CH8768/79 1979-09-28

Publications (2)

Publication Number Publication Date
EP0036002A1 true EP0036002A1 (fr) 1981-09-23
EP0036002B1 EP0036002B1 (fr) 1983-07-27

Family

ID=4344513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80901721A Expired EP0036002B1 (fr) 1979-09-28 1981-04-08 Dispositif de commande de la vitesse de rotation des broches d'un banc a broches

Country Status (13)

Country Link
US (1) US4375744A (fr)
EP (1) EP0036002B1 (fr)
JP (1) JPS638213B2 (fr)
AT (1) ATE4332T1 (fr)
AU (1) AU538097B2 (fr)
BE (1) BE885439A (fr)
BR (1) BR8008852A (fr)
DE (1) DE3064419D1 (fr)
ES (1) ES495765A0 (fr)
HK (1) HK70284A (fr)
IN (1) IN153941B (fr)
IT (1) IT1194694B (fr)
WO (1) WO1981000866A1 (fr)

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JPS5865012A (ja) * 1981-10-09 1983-04-18 Toyoda Autom Loom Works Ltd 粗紡機の粗糸巻取張力自動制御方法および装置
JPS5865013A (ja) * 1981-10-12 1983-04-18 Toyoda Autom Loom Works Ltd 粗紡機の粗糸巻取張力の制御方法および装置
DE3463361D1 (en) * 1983-08-02 1987-06-04 Howa Machinery Ltd Apparatus for controlling the winding speed of roving in roving frame
US4930520A (en) * 1985-05-16 1990-06-05 Algotek, Inc. Earpiece for auditory testing of infants
JP2652962B2 (ja) * 1989-04-07 1997-09-10 豊和工業株式会社 精紡機の運転制御方法
JP2804789B2 (ja) * 1989-06-30 1998-09-30 豊和工業株式会社 粗紡機における粗糸巻取装置
US5463557A (en) * 1992-05-15 1995-10-31 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Roving machine
US5706642A (en) * 1996-10-08 1998-01-13 Haselwander; Jack G. Variable twist level yarn
DE19649909C1 (de) * 1996-12-02 1997-07-31 Zinser Textilmaschinen Gmbh Vorspinnmaschine
US5913309A (en) * 1997-05-22 1999-06-22 Natus Medical Inc. Disposable element for use with a hearing screener
US5826582A (en) * 1997-05-22 1998-10-27 Natus Medical Inc. Ear phone assembly for use with a hearing screener
EP1095178B1 (fr) * 1999-02-11 2005-12-21 Lakshmi Machine Works Limited Machine a filer et retordre a anneaux
US7133715B1 (en) * 2000-01-07 2006-11-07 Natus Medical Inc. Hearing evaluation device with noise detection and evaluation capability
US20050157899A1 (en) * 2004-01-15 2005-07-21 Gabriel Raviv Molded earpiece assembly for auditory testing
US7299615B2 (en) * 2004-06-18 2007-11-27 Mannington Mills, Inc. Variable twist level yarn using fluid twisting
US7288306B2 (en) * 2004-08-25 2007-10-30 Mannington Mills, Inc. Textile substrate having low variable twist yarn

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US5367331A (en) * 1992-02-24 1994-11-22 Alcatel N.V. Video codec, for a videophone terminal of an integrated services digital network

Also Published As

Publication number Publication date
IT8024907A0 (it) 1980-09-25
HK70284A (en) 1984-09-21
WO1981000866A1 (fr) 1981-04-02
IT1194694B (it) 1988-09-22
US4375744A (en) 1983-03-08
EP0036002B1 (fr) 1983-07-27
AU538097B2 (en) 1984-07-26
AU6332480A (en) 1981-04-14
ATE4332T1 (de) 1983-08-15
DE3064419D1 (en) 1983-09-01
JPS56501249A (fr) 1981-09-03
IN153941B (fr) 1984-09-01
ES8203114A1 (es) 1982-03-01
BR8008852A (pt) 1981-07-21
JPS638213B2 (fr) 1988-02-22
BE885439A (fr) 1981-03-26
ES495765A0 (es) 1982-03-01

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