EP0622323B1 - Dispositif d'accumulation de matériau à embobiner - Google Patents

Dispositif d'accumulation de matériau à embobiner Download PDF

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Publication number
EP0622323B1
EP0622323B1 EP93303348A EP93303348A EP0622323B1 EP 0622323 B1 EP0622323 B1 EP 0622323B1 EP 93303348 A EP93303348 A EP 93303348A EP 93303348 A EP93303348 A EP 93303348A EP 0622323 B1 EP0622323 B1 EP 0622323B1
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EP
European Patent Office
Prior art keywords
accumulator
filamentary material
units
winding
unit
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
EP93303348A
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German (de)
English (en)
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EP0622323A1 (fr
Inventor
Frank W. Kotzur
Mark Swanson
Kevin Sutton
Donald J. Hopko
Thomas Rosenkranz
David Franklin
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Windings Inc
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Windings Inc
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Filing date
Publication date
Priority to CA002093183A priority Critical patent/CA2093183C/fr
Priority to AU36985/93A priority patent/AU657611B2/en
Application filed by Windings Inc filed Critical Windings Inc
Priority to DE1993615982 priority patent/DE69315982T2/de
Priority to EP93303348A priority patent/EP0622323B1/fr
Publication of EP0622323A1 publication Critical patent/EP0622323A1/fr
Application granted granted Critical
Publication of EP0622323B1 publication Critical patent/EP0622323B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage

Definitions

  • This invention is directed to method and apparatus for accumulator systems for maintaining proper line tension during the winding of filamentary material such as wire or cable from a primary source of filamentary material such as the apparatus for making the filamentary material or a secondary source such as a spool of filamentary material, and more particularly to such apparatus and method using a plurality of serially connected active accumulator elements which are interdependently controlled from a programmed controller.
  • FR-A-1 052 863 discloses a winding accumulator system according to the preamble of claim 1.
  • U.S. Patent No. 3,540,641 issued to Besnyo November 17, 1970 relates to a web accumulator for maintaining a substantially uniform web tension in which a pair of opposed arms are mounted for swinging movement at opposite ends of a frame.
  • a plurality of rollers are located at spaced intervals along the arms and the web is conducted alternately over a roller at the outer end of one arm and a roller at the inner end of the other arm and progressively back and forth over the rollers of both arms and then off the frame at the opposite end.
  • the arms swing in coordinated relation to provide wide variation of spacing and the arms are powered to swing when the tension in the web changes.
  • U.S. Patent No. 3,692,251 issued to Melead September 19, 1972 discloses a tensioning apparatus used with winding and unwinding apparatus for thread-like filamentary material in which a roller is mounted for rotation in members disposed at the ends of the roller and supported by pivot arms, thereby enabling horizontal movement of the roller.
  • the moving filamentary material engages the roller to apply a horizontal force opposite to a pre-determined desired horizontal force. Changes in the tension of the filamentary material cause horizontal motion of the roller and that motion adjusts tensions by changing the speed of the filamentary material.
  • U.S. Patent No. 3,871,205 issued to Fenton March 18, 1975 relates to apparatus for the length stabilization of armored well logging cable wherein the cable is passed from a payoff reel over hold-back sheaves, a series of fixed sheaves, a movable sheave, and haul-off sheaves to a take-up reel.
  • a hydraulic system controls the movable sheave to place the cable under tension.
  • a second hydraulic system cyclically varies the effect of the hold-back sheaves to vary the cable tension.
  • a first drive sets the surface velocity of a web-driving roller and a second drive sets the the surface velocities of the other web-driving rollers in response to the positions of the idler rollers to maintain substantially uniform web tension.
  • the horizontally opening accumulator schematically shown in Figures 1A, 1B and 1C is normally mounted overhead and as the filamentary material slackens it becomes a safety hazard for the operators of the accumulator.
  • the vertical accumulator opening down as schematically shown in Figures 2A, 2B and 2C has a minimum tension during static conditions, i.e. when the movable block is stationary or the output speed of the filamentary material is equal to the input speed.
  • Minimum tension is based upon gravity applying a force on the movable block. While this may be an advantage when the accumulator is filling with filamenatary material because gravity accelerates the block downward, it is also a disadvantage when filamentary material is being pulled out faster than it is being put in. Line tension increases during this dynamic change because the filamentary material must accelerate the movable block in the opposite direction of the gravitational force. Under static conditions the minimum tension of the filamentary material equals the weight of the movable block divided by the number of wraps.
  • the vertical accumulator opening up schematically shown in Figures 3A and 3B has one advantage in that it allows the operator to easily string the accumulator with the filamentary material.
  • the tensioning system must also operate against gravity and when low tensions are desired there is not enough force to open the accumulator during filling of the filamentary material. This means complete failure of the accumulator. To close the accumulator the line tension must increase to move the block.
  • the inertia of the accumulator is its greatest disadvantage. During any speed change of the filamentary material, the material either becomes slack or high line tensions are applied.
  • the accumulator system comprises a plurality of serially interconnected accumulator units and a programmed controller.
  • the filamentary material capacity of each successive accumulator unit is double that of a preceding accumulator unit.
  • the first accumulator unit comprises a buffer/dancer, an accumulator and a motor-driven capstan with a total capacity of, for example, forty feet (12m).
  • the second accumulator unit comprises an accumulator, a motor- driven capstan and a twisted rod and potentiometer control with a total capacity of eighty feet (24m).
  • the third accumulator unit is essentially the same as the second accumulator unit but without a motor-driven capstan and with a total capacity of one hundred-sixty feet (48m).
  • the primary object of the present invention is to provide an accumulator system which maintains proper line tensions and prevents problems induced by sluggish response to sudden starts, stops, accelerations and decelerations during the movement of filamentary material, and in particular during the winding of such material.
  • large capacity accumulators for example 300 feet (90m) of filamentary material, sudden changes in line speed may cause excessive tension or cause the filamentary material to jump from the accumulator sheaves and tangle.
  • the above objects, features and advantages of the invention are essentially accomplished by the sequential action of a number of serially connected accumulator units.
  • This enables the mass of the sheaves and blocks to be distributed over the number of accumulator units rather than being massed into one accumulator unit, thereby increasing the response time of these movable sheaves and blocks.
  • a motor-driven capstan located between each series connected accumulator units controls the amount of filamentary material in a particular accumulator with which it is associated, and in turn is controlled by a programmed controller.
  • the individual motor-driven capstans are controlled to minimize the movable block accelerations, which relates to tension in the filamentary material.
  • the vertical accumulator opening down type has been chosen because it affords the best response to changes in the movement of the filamentary material after eliminating all the weight possible in the moving block and driving system.
  • the primary principle of the present invention is that, for example, an accumulator for holding three hundred feet (90m) of filamentary material, such as cable or wire, is divided into a number of interconnected and interdependent units. This results in a significant lowering of the mass of each of the individual accumulator units, thereby reducing inertia and enabling quicker response of the moving sheaves of the individual accumulators.
  • the following description is taken with respect to an exemplary accumulator control system employing three accumulators, it being understood that the principle of the invention is applicable to any number of cascaded accumulator units.
  • the first accumulator unit 18 comprises a three foot (0,9m) tall spring-loaded) buffer/dancer (not shown) with a total of five Derlin sheaves (three over two), an output guide (not shown), plus a six foot (1,8m) tall air-loaded accumulator 18 consisting of a stationary block 14 and a movable block 16, with a total of nine, nine inch (0,22m) aluminum sheaves (five over four), and a nine inch (0,22m) motor driven capstan 20.
  • the filamentary material 12 such as wire or cable
  • a source of filamentary material such as a cable or wire spool, or directly from the line from which the filamentary material is manufactured, to stationary block 14 of first accumulator 18.
  • the filamentary material is wound around the individual sheaves of stationary block 14 and moving block 16. Assuming the accumulator system is to have a total capacity of 300 feet of filamentary material, the capacity of the first accumulator unit 18 is forty feet (12m).
  • the buffer/dancer is not essential and can be employed, for example, in an application in which the accumulator system of the invention is used in conjunction with a winding apparatus having a reciprocating traverse, such as disclosed in U.S. Patent Nos. 4,406,419 and 4,477,033, both assigned to the same assignee as the subject invention.
  • the buffer/dancer then provides a suitable buffer for feeding the filamentary material to the traverse mechanism of the winding apparatus.
  • the buffer/dancer is not necessary.
  • the operation of such a buffer/dancer is conventional and known to those skilled in the art of winding filamentary material such that no further description of its structure is necessary for the purposes of this invention.
  • the second accumulator unit 22 comprises a ten foot (3m) tall accumulator, with an eight foot (2,4m) air-loaded cable cylinder with a stationary block 24 and movable block 26 with a total of fourteen, nine inch (0,22m) aluminum sheaves (seven over seven) and a nine inch (0,22m) motor driven capstan 28.
  • the stationary block 24 and the sheaves therein are air piston-locked in position except during string-up when they can be lowered to simplify that operation. A string-up technique forming part of the present invention will be described hereinafter.
  • the movable block 26 and sheaves are active using both gravity and the cable cylinder.
  • the accumulator unit 22 has a total capacity of eighty feet (24m) of filamentary material.
  • Third accumulator unit 30 comprising stationary block 32 and movable block 34, is approximately 10 feet (3m) tall and the same as the second accumulator unit 22, with the exception that there are twenty seven, nine inch (0,22m) aluminum sheaves (fourteen over thirteen).
  • the third accumulator unit 30 has a total capacity of one hundred sixty feet (48m).
  • the filamentary material enters the third accumulator 30 from a source of filamentary material such as wire or cable spool, or the production line which actually produces the filamentary material.
  • the second and third accumulator units 22 and 30 are preferably mounted on one ten foot (3m) tall steel channel.
  • the accumulator units may be spread out and separated as indicated in Figure 6.
  • the potentiometer controls for the motor driven capstans are preferably wall mounted or mounted in a separate control cabinet.
  • the operation of the accumulator system of the invention is as follows. After the individual accumulators have been strung-up, the first accumulator 18 is at position A, the second accumulator 22 is at position E and the third accumulator 30 is at position I. All of the line speeds are the same at all points, namely the output, input capstan 20 and capstan 28 speed. Assume that the filamentary material line speed is one thousand ft/min. (300m/min), and if the output goes to zero, capstans 20 and 28 still operate at one thousand ft/min (300m/min). Thus the first accumulator 18 starts to fill until it is at a position B, then capstan 20 decelerates and stops when the first accumulator 18 is at position D.
  • the second accumulator 22 starts to fill.
  • capstan 28 decelerates and the second accumulator 30 starts to fill.
  • the second accumulator 22 is at position H capstan 28 is stopped.
  • the third accumulator 30 is now taking up the filamentary material at one thousand ft/min. (300m/min) which is equal to the input of filamentary material at the first accumulator unit 18.
  • the output of filamentary material must begin before the third accumulator unit 30 is at position K. As the output of filamentary material increases to more than one thousand ft/min. (300m/min), the first accumulator unit 18 empties.
  • the first capstan 20 accelerates to more than one thousand ft/min (300m/min).
  • the first accumulator 18 stops emptying at position C.
  • the second accumulator unit 22 empties and the second capstan 28 starts feeding cable into the second accumulator 22.
  • the third accumulator unit 30 decelerates and stops as capstan 28 reaches one thousand ft/min. (300m/min).
  • the second accumulator unit 22 will be at position G when capstan 28 is driven at one thousand ft/min. (300m/min).
  • capstan 28 will go over one thousand ft/min. (300m/min), which causes the third accumulator unit 30 to start closing.
  • capstan 28 When the third accumulator unit 30 reaches position J, capstan 28 is decelerated to one thousand ft/min (300m/min). When the third accumulator 30 is back to position I, capstan 28 is going at one thousand ft/min. (300m/min) and the second accumulator unit 22 will finish emptying. When the second accumulator 22 is at position E, capstan 20 is going at one thousand ft/min (300m/min). Therefore, the first accumulator 18 finishes emptying until it reaches position A and the operation of the accumulator system is back to where it started. It is noted that the device taking up the cable at the output of the accumulator system is controlled by the position of the first accumulator 18, as that accumulator unit empties the takeup to match line speed.
  • the significant advantages of the above structure and operation is as follows.
  • the first accumulator unit 18 accelerates to speed in approximately one second as is shown in Figure 7 as it has the lightest weight.
  • the second accumulator unit 22 accelerates to one thousand ft/min. (300m/min) in 2 seconds as it is heavier than the first accumulator unit 18.
  • the third accumulator unit 30 accelerates to the required speed of one thousand ft/min. (300m/min) in four seconds. Therefore the tension during dynamic changes in the accumulator system is controlled. It is to be noted that the decelerations of the first and second accumulator units 22 and 30 are exponential.
  • the inertia of the sheaves is another aspect of accumulator operation that has not been fully addressed by the prior art accumulator systems.
  • sheave E must rotationally accelerate with the output. Sheave A will not rotate, so no acceleration occurs. Sheave B will accelerate at 1/4 the rate of acceleration of sheave E. Sheave C will accelerate at 1/2 the rate of acceleration of sheave E and sheave D will accelerate at 3/4 the rate of acceleration of sheave E.
  • the tension will therefore be different for each wrap of the material.
  • the cable from sheave A to B will be different from that of B to C, etc. Each sheave is accelerated at a different rate.
  • sheaves have high inertia, then two stands can hold the entire weight of the blocks for a short duration of time. This creates a high tension impulse on the cable which may damage it. Such an effect is compounded by the addition of more sheaves. The aforementioned effects can be decreased by using sheaves with the lowest inertia available.
  • the second and third accumulators are constructed on one support beam as shown in Figure 10A .
  • such a construction is useful when there is a relatively short distance between the source of the filamentary material and the input to the accumulator system. But if there is such a distance between the source of filamentary material and the input of the accumulator system that the filamentary system sags, then the configuration of Figure 6 is preferred where the second and third accumulator units are mounted on separate supports. Long spans of filamentary material that result in sagging tend to produce undesired oscillations in the system.
  • the second and third accumulators 40 are mounted on the same beam 42 in side-by-side relationship as is clear from Figure 10B, which is a top view of the individual accumulator units with the accumulator controller 44, take-up unit 46 and take-up controller 48 also illustrated.
  • the take-up unit 46 and take-up controller 48 form no part of the present invention and therefore no further description of their respective structure and operation is necessary for the purposes of this invention.
  • the filamentary material 50 is strung on the individual sheaves 52, 54 of accumulator units 2 and 3 and motor driven capstan 56 and then to motor driven capstan 58 and then strung around the individual sheaves 60 of the first accumulator unit 62, through footage counter wheel 64 and then strung around the buffer/dancer unit 66.
  • the buffer/dancer 66 enables the accumulator system to adjust to the reciprocating motion of a traverse on a rewinding apparatus, and thus the configuration of the accumulator system shown in Figure 10A is suitable for operation with a rewinding apparatus such as that disclosed in U.S. Patent Nos. 4,406,419 and 4,477,033, both assigned to the same assignee as the present invention.
  • the accumlator systems of Figures 6 and 10A are strung up by lowering the lower sheaves 26 and 34 of accumulator units 22 and 30 ( Figure 6) and lowers sheaves 43 and 63 of Figure 10A by depression of a "String-Up" button on the controller. This automatically raises the cable cylinder cables to the topmost position, thus preventing free fall of the upper sheaves 24 and 32 of Figure 6 and 45 and 65 of Figure 1-A.
  • the dead-bolt locks (not shown) that hold the top sheaves in their normal operating position are released.
  • the top sheaves 24 and 32 of Figure 6 and 45 and 65 of Figure 10A are slowly lowered by bleeding air out of the air cylinder (to be described more fully hereinafter) until the top sheave block is resting on the bottom sheave block.
  • FIG. 10C is a block diagram representation of the pneumatic system for controlling the cable cylinders 70, 72.
  • Figure 11 illustrates, in combined schematic and block diagrammatic format, the essential circuitry for controlling the motor driven capstans to feed the filamentary material through the accumulator system of the invention.
  • the respective first, second and third accumulator unit potentiometers namely ACCUM #1 POT, ACCUM #2 POT and ACCUM #3 POT provide information as to the actual position (height) of the movable blocks 16, 26, and 34 in each of the respective ACCUMULATOR 1, ACCUMULATOR 2 and ACCUMULATOR 3 units (Fig. 6) and which information is input to respective summing and compensation circuits 86, 88 and 90.
  • Each of the summing and compensation circuits 86, 88 and 90 provide properly compensated error signals for the first and second capstans and the final take up by using the settings of each of the accumulator potentiometers 80, 82 and 84 and the respective associated height adjust potentiometers 92, 94 and 96.
  • the respective reference clamping circuits 98, 100 and 102 adjust the input to the capstans from the summing and compensation circuits with respect to respective signals from ACCUM #1 STOP POSITION, ACCUM #2 STOP POSITION and ACCUM #3 STOP POSITION potentiometers, the respective outputs of the latter potentiometers being input respectively to reference clamping circuits 98, 100 and 102, when certain conditions are met as described above in the operation of the accumulator system.
  • reference clamping circuit 98 may be reducing that speed because the position of the first accumulator is no longer near its normal running height because the take up is stopped. This would cause the second accumulator to begin falling because reference clamping circuit 98 is controlling the first motor driven capstan to go slower. And, even though the third accumulator is at its normal running height providing a reference signal I for 900 ft/min., (274 m/min), reference clamping circuit 100 will begin reducing signal I because the second accumulator unit is no longer in place. Additional cascaded circuits can be provided for additional accumulator units if necessary, such that the accumulator control system of the invention is not limited to the three accumulator units described herein for purposes of explaining the structure and operation of the accumulator control system.

Landscapes

  • Tension Adjustment In Filamentary Materials (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Claims (3)

  1. Système d'accumulateurs de bobinage, destiné à commander le stockage de matériau filiforme entre une source d'un tel matériau et un réceptacle de bobinage, comprenant :
    une pluralité de dispositifs accumulateurs reliés en série (18, 22, 30), comprenant chacun un moyen destiné à stocker du matériau filiforme, chacun des dispositifs accumulateurs comprenant une moufle fixe (14, 24, 32) et une moufle mobile (16, 26, 34), grâce à quoi le déplacement de ladite moufle mobile à l'écart de ladite moufle fixe et en direction de celle-ci augmente ou diminue respectivement la quantité de matériau filiforme stocké dans le dispositif accumulateur respectif,
    un moyen destiné à faire varier le déplacement dudit matériau filiforme entre les dispositifs accumulateurs adjacents, et comprenant un moteur à cabestan (20, 28) entre chaque dispositif accumulateur successif, et
    un moyen destiné à commander lesdits moyens de variation afin de limiter la variation de tension dudit matériau filiforme, qui varie lors de l'accélération ou de la décélération dudit matériau filiforme provoquée par une variation de l'introduction ou de la sortie du matériau filiforme dans ou hors du système d'accumulateurs, et comprenant en outre un moyen (80, 82, 84) destiné à déterminer le sens de déplacement de chaque dite moufle mobile à partir de la vitesse de déplacement relative du matériau filiforme entrant dans le dispositif accumulateur respectif et en sortant, caractérisé en ce que le premier dispositif accumulateur reçoit du matériau filiforme de ladite source et stocke une quantité donnée de matériau filiforme, et chaque dispositif accumulateur suivant stocke une quantité de matériau filiforme qui est un multiple entier de la quantité stockée par un dispositif accumulateur précédent, ledit système d'accumulateurs de bobinage comprenant en outre des moyens (80, 82, 84) destinés à détecter la quantité de matériau filiforme stockée dans chacun desdits dispositifs accumulateurs, des moyens (92, 94, 96) destinés à indiquer une quantité de référence souhaitée de matériau filiforme à stocker dans chacun desdits dispositifs accumulateurs, des moyens (86, 88, 90) destinés à comparer la quantité stockée et de référence de matériau filiforme dans chaque dispositif accumulateur afin de générer des signaux de commande des moteurs à cabestan respectifs, et comprenant en outre des moyens (98, 100, 102) destinés à combiner les signaux de commande des moteurs à cabestan respectifs provenant de deux dispositifs accumulateurs adjacents afin de commander le moteur à cabestan immédiatement en amont desdits deux dispositifs accumulateurs adjacents.
  2. Système d'accumulateurs de bobinage selon la revendication 1, comprenant en outre un moyen de tampon/danseur destiné à recevoir la sortie d'un matériau filiforme provenant du dernier des dispositifs accumulateurs afin de permettre le réglage du système d'accumulateurs en fonction des variations de l'entrée de matériau filiforme dans le réceptacle de bobinage.
  3. Système d'accumulateurs de bobinage selon la revendication 2, dans lequel ledit moyen destiné à commander comprend en outre des moyens respectifs (80, 81, 82) destinés à déterminer la position de la moufle mobile dans chacun des dispositifs accumulateurs, des circuits de sommation et de compensation respectifs (86, 88, 90) répondant au moyen de détermination de position respectif pour générer des signaux d'erreur compensés respectifs, et des circuits de fixation de référence respectifs (98, 100, 102) destinés à régler la sortie d'un circuit de sommation et de compensation respectif en fonction de la position de la moufle mobile d'un dispositif accumulateur amont adjacent.
EP93303348A 1993-04-14 1993-04-28 Dispositif d'accumulation de matériau à embobiner Expired - Lifetime EP0622323B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002093183A CA2093183C (fr) 1993-04-14 1993-04-14 Systeme d'accumulateur acc 300
AU36985/93A AU657611B2 (en) 1993-04-14 1993-04-16 ACC 300 accumulator system
DE1993615982 DE69315982T2 (de) 1993-04-28 1993-04-28 Speichervorrichtung für Wickelgut
EP93303348A EP0622323B1 (fr) 1993-04-14 1993-04-28 Dispositif d'accumulation de matériau à embobiner

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA002093183A CA2093183C (fr) 1993-04-14 1993-04-14 Systeme d'accumulateur acc 300
AU36985/93A AU657611B2 (en) 1993-04-14 1993-04-16 ACC 300 accumulator system
EP93303348A EP0622323B1 (fr) 1993-04-14 1993-04-28 Dispositif d'accumulation de matériau à embobiner

Publications (2)

Publication Number Publication Date
EP0622323A1 EP0622323A1 (fr) 1994-11-02
EP0622323B1 true EP0622323B1 (fr) 1997-12-29

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EP93303348A Expired - Lifetime EP0622323B1 (fr) 1993-04-14 1993-04-28 Dispositif d'accumulation de matériau à embobiner

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EP (1) EP0622323B1 (fr)
AU (1) AU657611B2 (fr)
CA (1) CA2093183C (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111675046A (zh) * 2019-03-11 2020-09-18 西门子(深圳)磁共振有限公司 具有用于病床线缆的绕线机构的磁共振系统
CN109748142A (zh) * 2019-03-28 2019-05-14 广东金华电缆股份有限公司 一种带储线保护的二合一导体复绕机
EP4174005A1 (fr) * 2021-10-29 2023-05-03 Corning Research & Development Corporation Accumulateur pour la fabrication de câbles à fibres optiques, système de fabrication comportant un tel accumulateur et procédés associés

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB706726A (en) * 1951-10-23 1954-04-07 Glover & Co Ltd W T Apparatus for storing a length of cable or the like long flexible article
US2929569A (en) * 1957-02-26 1960-03-22 Western Electric Co Continuous wire winding apparatus
US3692251A (en) * 1970-10-26 1972-09-19 Beloit Corp Winding,unwinding and tensioning apparatus
US4477033A (en) * 1981-10-15 1984-10-16 Windings, Inc. On-line winding machine
DE3713575A1 (de) * 1987-04-23 1988-11-03 Statomat Globe Maschf Vorrichtung zur zufuehrung von kabel von einer vorratsrolle zu einem verbraucher

Also Published As

Publication number Publication date
CA2093183A1 (fr) 1994-10-15
EP0622323A1 (fr) 1994-11-02
AU3698593A (en) 1994-10-27
AU657611B2 (en) 1995-03-16
CA2093183C (fr) 1996-03-05

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