EP0037415B1 - Machine d'enroulement de ressorts avec moyens ameliores d'entrainement des cylindres d'alimentation - Google Patents

Machine d'enroulement de ressorts avec moyens ameliores d'entrainement des cylindres d'alimentation Download PDF

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Publication number
EP0037415B1
EP0037415B1 EP80902097A EP80902097A EP0037415B1 EP 0037415 B1 EP0037415 B1 EP 0037415B1 EP 80902097 A EP80902097 A EP 80902097A EP 80902097 A EP80902097 A EP 80902097A EP 0037415 B1 EP0037415 B1 EP 0037415B1
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EP
European Patent Office
Prior art keywords
lever
cam
coiling
drive
wire
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
EP80902097A
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German (de)
English (en)
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EP0037415A1 (fr
EP0037415A4 (fr
Inventor
Erman V. Cavagnero
Nicholas J. Marracino
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.)
Torin Corp
Original Assignee
Torin Corp
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Filing date
Publication date
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Publication of EP0037415A1 publication Critical patent/EP0037415A1/fr
Publication of EP0037415A4 publication Critical patent/EP0037415A4/fr
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Publication of EP0037415B1 publication Critical patent/EP0037415B1/fr
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B21F3/02—Coiling wire into particular forms helically
    • B21F3/04—Coiling wire into particular forms helically externally on a mandrel or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B21F3/02—Coiling wire into particular forms helically

Definitions

  • This invention relates to spring coiling machines and, more particularly to a cyclically operable spring coiling machine having a coiling station, at least one pair of oppositely rotatable feed rolls for intermittently advancing wire longitudinally to the coiling station, a relatively fixed wire coiling arbor at the coiling station, at least one relatively fixed coiling tool at the coiling station arranged to engage the longitudinally advancing wire to obstruct the linear movement thereof whereby progressively to bend the same about the coiling arbor and impart a coiling stress thereto resulting in the formation of a coil spring configuration at a leading end portion thereof, a cut-off tool at said coiling station operable successively to sever coiled leading end portions of the wire whereby to provide individual coil springs, feed roll drive gear means including unidirectional drive means and an operatively associated input drive gear, the unidirectional drive means causing said feed rolls to rotate oppositely and in wire feeding direction on rotation of said input gear in a drive direction and rendering said feed rolls inoperative on rotation of said input gear in an opposite and return direction
  • Segment-type coilers are the more common and include a large oscillatory gear segment driving a feed roll gear train with a unidirectional clutch for intermittent longitudinal wire advancement to a coiling station. While coiling machines of this type are characterised by a high degree of accuracy and dependability in use, they are somewhat limited with regard to high speed production. A relatively heavy and high inertia element such as a large gear segment has inherent limitations in increasing the speed of operation of the machine. In a typical high volume production operation automotive valve springs are produced on segment-type coiling machines manufactured by Torin Corporation of Torrington, Connecticut, at a production rate of approximately 80 springs per minute.
  • a Wafios machine In an attempt to improve the production rates of segment-type spring coiling machines, a Wafios machine employs a larger number of feed rolls than the conventional segment coiler but the rolls are of smaller size to reduce inertia and a light-weight aluminium alloy segment is used in place of the conventional gray iron and steel segment. This results in some reduction of inertia forces and in a high volume valve spring operation as mentioned above the Wafios machine has achieved production rates of approximately 100 to 110 springs per minute.
  • Clutch-type spring coilers employ a clutch in place of the segment for driving the feed rolls and are particularly well adapted to applications where long wire feeds or even continuous wire feeding is required.
  • Clutch-type machines may also employ a continuous wire feed with a flying-cutoff device for severing the individual springs. While relatively high rates of production can be achieved, the accuracy of clutch machines cannot match the segment-type spring coiling machines and it is often necessary to reduce machine speed in order to obtain the necessary accuracy and dependability in operation.
  • U.S. Patent Specification 2,119,002 French Patent Specification 1,315,882 and Canadian Patent Specification 672,315.
  • a cyclically operable spring coiling machine with at least one feed roll cam mounted on said drive shaft for continuous rotation therewith, cam actuated means including a cam follower an an operatively associated oscillable cam lever having an output end portion movable in one and an opposite direction respectively for drive and return rotation of said input gear in said feed roll gear means, a drive and connecting device between said output end portion of said oscillable cam lever and said input gear for rotating the latter in said drive and return directions respectively on movement of said cam lever end portion in said one and opposite directions, and wire feed length adjustment means operatively associated with said oscillable cam lever and connecting means and serving to adjust the degree of input gear drive rotation relative to cam follower movement.
  • the wire feeding portion of a machine cycle in a segment machine is limited to about 230° or less depending on the length of wire being fed.
  • a cam drive it is possible to achieve approximately a 270° feed portion of a cycle with a 90° return portion for all wire lengths.
  • the short return portion of the cycle is possible due to the low inertia characteristics of reciprocating and oscillating elements and the absence of any requirement for return of a relatively heavy segment.
  • the spring coiling machine of the present invention is capable of producing 130 springs per minute in the above mentioned high volume valve spring operation.
  • approximately a 60% improvement is achieved in the rate of production over that of a conventional segment drive machine and yet the accuracy and the dependability of a segment drive machine is equaled if not exceeded.
  • a spring coiling machine indicated generally at 10 has first and second pairs of oppositely rotatable feed rolls 12, 14 and 16, 18 for advancing wire longitudinally to a coiling station indicated generally at 20.
  • the upper feed rolls 12, 16 rotate in a clockwise direction and the lower rolls 14, 18 in a counterclockwise direction to feed wire 22 leftwardly through guides 24, 26, 28 for the formation of the wire into a coil spring configuration 30 at its leading end portion.
  • the leading end portions of the wire 22 are coiled about a coiling arbor 32 at the coiling station 20, the arbor cooperating with a coiling tool 34 at the station in the form of a coiling roll.
  • the coiling arbor 32 and tool 34 are fixed at the coiling station relative to the wire so that longitudinally advancing wire engages the tool 34 and is obstructed in its linear movement thereby, the wire thus being progressively bent about the arbor 32 with a coiling stress imparted thereto resulting in the formation of the leading end coil spring configuration.
  • Element 38 at the coiling station 20 may take the form of a second cutoff tool or a pitch tool engageable with the wire during coiling about the arbor 32 progressively to pitch the same as required for the coil spring to be formed.
  • the spring coiling machine 10 is or may be conventional and for further illustration and description of such a machine including operating means for elements such as the cutoff tool 36 and pitch tool 38 reference may be had to Bergevin and Nigro patent no. 2,119,002 for SPRING COILING MACHINE, dated May 3, 1938.
  • the machine shown and described in the patent is of the segment drive type mentioned above and while highly accurate and dependable in operation is limited as to its rate of spring production.
  • the spring coiling machine of the present invention is cyclically operable as in the case of the segment coiler of the aforementioned patent and operates to intermittently advance wire longitudinally leftwardly to the coiling station 20.
  • the feed roll drive means in the machine of the present invention is of the cam type rather than the segment type with resulting operational and economic advantages.
  • a drive motor and speed reducer 40 are illustrated at a right-hand portion of the machine, and in Fig. 2 an output pulley or sprocket 42 drives a pulley or sprocket 44 via a pulley or sprocket 46 associated therewith.
  • the pulley or sprocket 44 has a coaxial gear 48 rotatable therewith to drive a gear 50 in the counterclockwise direction as illustrated in Fig. 2.
  • the gear 50 has a coaxial gear 52 in turn driving a gear 54 in a clockwise direction and serving to rotate the gear 56 on a shaft 58 in a counterclockwise direction.
  • the shaft 58 is power driven for continuous rotation and may hereafter be referred to as a power driven cam shaft, the shaft also carrying a cam 60 which is a principal element in a feed roll drive means of the present invention.
  • the cam 60 includes a track 62 partially illustrated in Fig. 3 and which has an associated follower 64 at a lower end portion of a cam lever 66.
  • the cam lever 66 is oscillable in Fig. 3 about a pivot shaft 68 and carries at an upper or free end portion thereof a slide 70.
  • the slide 70 in turn operates a drive and connecting device 72 for pinion gear 74, an input gear in a feed roll drive means.
  • the slide also forms a part of a wire feed length adjustment means operatively associated with the cam lever 66 and the drive and connecting device 72 and which may be a part of either or both of said elements.
  • the input or pinion gear 74 is mounted on a shaft 76 and also drives a larger gear 78 for driving feed roll gears 80, 82, 84 and 86.
  • a unidirectional or index clutch is also a part of the feed roll drive gear means and may be mounted on the shaft 76 between the pinion gear 74 and the larger gear 78.
  • the feed rolls may be operated to rotate in a drive or wire feeding direction and to remain stationary in a return direction of elements including the gear 74, the drive and connecting device 72, the cam lever 66 and follower 64.
  • gears 80, 82 respectively drive feed rolls 14, 12 and gears 84, 86 respectively drive feed rolls 16, 18.
  • the drive or feed direction of gear and roll rotation is indicated by small arrows in Figs. 1 and 2.
  • the drive and connecting device 72 preferably comprises a rack assembly including a rack gear 88 on a reciprocable link 90 pivotally connected at a right-hand end portion 92 to the slide 70.
  • a housing 94 mounted on the hub of gear 74 is rotatable through at least a limited arc and slidably receives the link and/or rack gear 88.
  • the action of the link 90 and rack gear 88 is not precisely linear but tends to the oscillatory with the link slidable in the swingable housing 94 and with ball or roller bearings 96 provided in the housing for free sliding action.
  • cam induced oscillation of the follower 64 relative to the cam or drive shaft 58 will result in oscillatory movement of the lever 66 about its pivot shaft 68, reciprocable or slightly oscillatory movement of the link 90 and in rotation of the pinion or input gear 74 in one and an opposite direction by the rack gear 88.
  • the small arrows in Fig. 2 indicate such movement in a drive or wire feeding direction with a return or inoperative movement of course occurring in an opposite direction.
  • the rotation of the cam 60 may be continuous with reciprocating and/or oscillating movement occurring between the cam and the feed rolls 12-18, the unidirectional clutch on the shaft 76 serving to terminate feed roll rotation at the end of a wire advancing or feeding portion of the machine cycle.
  • a portion of the cycle as high as 270° can be employed for feeding wire with the cam driven feed roll arrangement of the present invention.
  • the machine is designed for a limited range of wire feed lengths particularly well suited to the automotive valve spring operation mentioned above, that is, a 25,4 to 101,6 cm (10 to 40 inch) variation or adjustment in wire feed.
  • the wire feed length adjustment means of the invention includes the slide 70 as mentioned and a means for moving the slide in one and an opposite direction along the length of the lever 66 and for fixing the slide in a desired position of adjustment.
  • a lead screw 98 is associated with the slide 70 and has an end portion thereof secured in the body of the lever 66 at 100. Rotation of the lead screw serves to adjust the position of the slide 70 along the lever 66 and a fixing or binding screw 102 serves to secure the slide in adjusted position along the lever.
  • a maximum throw is provided for the oscillable lever 66 with the slide 70 positioned at its extreme outward limit as illustrated.
  • lesser wire feed lengths are provided for as desired.
  • each of the reciprocating and/or oscillating elements is constructed and arranged to provide for minimum weight and internal conditions.
  • the cam 60 and/or substitute cams has an inherent capability for adjustment and selection of desired acceleration and deceleration characteristics of the feed rolls.
  • a cycloidal acceleration characteristic for a wire feeding operation of the feed rolls is a second or third harmonic motion.
  • third harmonic foward and return motions as well as a modified sine characteristic for acceleration.
  • a second form of the feed roll drive means of the present invention is illustrated and includes a linearly reciprocable rack 88a driving a pinion gear 74a.
  • the rack 88a is driven by a connecting link 90a having a pivotal connection therewith at 104.
  • Cam lever 60a has a pivot shaft at 106 and a follower at 64a cooperating with an externally configured cam 60a.
  • the construction and arrangement of the spring coiling machine may be otherwise identical with that illustrated and described above.
  • FIGs. 5-7 illustrate a wire feed length adjustment means capable of running operation i.e., adjustable while the spring coiling machine is in operation.
  • a cam lever 66b is substantially identical with the lever 66 and has an associated slide 70b moved longitudinally of the lever by means of a lead screw 98b.
  • the lead screw 98b, at a lower or inner end portion is power operated from small motor 108 which may comprise a motor of the air or hydraulic type e.g., a Gardner air motor or a Lamina Company hydraulic motor.
  • a lock-up or position fixing device for the slide 70b may take the form of a small FAB Co. pancake cylinder, air or hydraulic, indicated at 110.
  • the small lock-up cylinder 110 is mounted on bracket 112 secured as by suitable screws 114, 114 to the slide 70b and having an output number 116 frictionally engageable with a rear portion 118 of the cam lever.
  • the member 116 is withdrawn or at least released on the member 118 during longitudinal adjustment of the slide 70b relative to the cam lever 66b, the motor 108 serving to effect such adjustment as required.
  • the pancake cylinder 110 is energized to urge the binder or frictional member or pin 116 into firm engagement with the lever portion 118 and to secure the slide in adjusted position.
  • the motor 108 is located in close proximity to the pivot shaft 68a to minimize inertial forces during oscillation of the cam lever 66b.
  • the motor is also of minimal weight and size as is the lock-up cylinder 110.
  • the lock-up cylinder 110 must of necessity be located outwardly along the lever 66b but its minimal weight avoids any serious inertia problems.
  • the various features of the feed roll drive means of the present invention cooperatively provide a highly accurate and high speed spring coiling machine.
  • the heaviest and highest inertia element in the drive means in the form of the cam is rotated continuously while all elements between the cam and the unidirectional clutch are designed for a minimal inertia.
  • the ability of the cam drive means to employ a 270° feed portion of the machine cycle further contributes to efficient high speed operation as does the ability of the cam to provide desired acceleration and deceleration characteristics of the feed rolls and other elements driven thereby.
  • the resulting production rates of 130 valve springs per minute represent a substantial improvement in machine speed.
  • the spring coiling machine of the present invention is useful in the high volume manufacture of coil springs and particularly automotive valve springs.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Advancing Webs (AREA)
  • Springs (AREA)
  • Vehicle Body Suspensions (AREA)
  • Manufacture Of Motors, Generators (AREA)

Claims (10)

1. Machine (10) à spiraler les ressorts actionnable cycliquement et comportant une station de spiralement (20), au moins une paire de galets d'alimentation (12, 14, 16, 18) susceptibles de tourner en sens inverse pour faire avancer le fil (22) longitudinalement par intermittence en direction de la station de spiralement (20), un arbre (32) de spiralement de fil fixe dans la station de spiralement (20), au moins un outil de spiralement (34) fixe dans la station de spiralement (20), ledit outil (34) étant disposé de telle manière qu'il vienne en contact avec le fil (22) avançant longitudinalement pour empêcher son mouvement linéaire et ainsi le courber progressivement autour de l'arbre de spiralement (32) en lui faisant subir une contrainte de spiralement qui débouche sur la formation d'une configuration de ressort spiralé au niveau de l'extrémité d'attaque du fil, un outil de coupe (36, 38) dans la station de spiralement (20) actionnable par intermittence pour rompre les portions d'extrémité d'attaque spiralées du fil (22) en donnant des ressorts spiralés individuels, des moyens d'entraînement à pignons (74, 78, 80, 82, 84, 86) pour les galets d'alimentation comprenant des moyens d'entraînement unidirectionnel et un pignon d'entraînement d'entrée (74) associé opérativement, les moyens d'entraînement unidirectionnel provoquant la rotation desdits galets d'alimentation (12, 14, 16, 18) en sens inverse et dans la direction d'alimentation du fil lors de la rotation dudit pignon d'entrée (74) dans une direction d'entraînement et rendant lesdits galets d'alimentation (12, 14, 16, 18) inopérants lors de la rotation dudit pignon d'entrée (74) dans und direction opposée et de retour, des moyens actionnés (58, 60, 66, 90) par de l'énergie pour entraîner lesdits moyens d'entraînement à pignons (74-86) et lesdits galets d'entraînement (12-18) comprenant un arbre d'entraînement tournant en continu, caractérisé en ce qu'il comporte au moins une came (60) pour galets d'alimentation montée sur ledit arbre d'entraînement (58) de manière à tourner en continu avec lui, des moyens actionnés par la came comprenant un suiveur de came (64) et un levier de came (66) oscillant opérativement associé avec le suiveur de came, ce levier de came (66) ayant une extrémité de sortie déplaçable dans une direction et dans la direction opposée pour, respectivement, entraîner, et ramener, en rotation ledit pignon d'entrée (74) desdits moyens à pignons d'entraînement des galets d'alimentation, un dispositif d'entraînement et de connexion (90) entre ladite extrémite de sortie dudit levier de came (66) oscillable et ledit pignon d'entrée (74) pour faire tourner ce dernier dans les directions d'entraînement et de retour respectivement selon le mouvement de ladite extrémité de levier de came dans une direction et dans la direction opposée, et des moyens de réglage de longueur d'alimentation en fil (70, 98) associés opérativement avec ledit levier de came (66) oscillant et les moyens de connexion et servant à régler le degré de rotation d'entraînement du pignon d'entrée par rapport au mouvement du suiveur de came.
2. Machine à spiraler les ressorts actionnable cycliquement selon la revendication 1, caractérisé en ce que lesdits moyens de réglage de longueur d'alimentation en fill (70, 98) revêtent la forme d'un dispositif de réglage (70, 98) prévu sur le levier de came oscillant (66) pour régler la longueur efficace dudit levier entre le suiveur de came (64) et la partie d'extrémité de sortie dudit levier entraînant ledit dispositif d'entraînement et de connexion (90).
3. Machine à spiraler les ressorts actionnable cycliquement selon la revendication 2, caractérisée en ce que ledit dispositif de réglage (70, 98) prévu sur ledit levier à came (66) revêt la forme d'un coulisseau (70) réuni par une liaison pivotante avec ledit dispositif de connexion (90) et déplaçable le long du levier pour se rapprocher et s'éloigner du suiveur de came (64), et ledit dispositif comprenant également une vis de réglage (98) actionnable en coopération avec le coulisseau (70) et le levier (66) pour régler la position du coulisseau (70) par rapport au suiveur de came (64).
4. Machine à spiraler les ressorts actionnable cycliquement selon la revendication 3, caractérisé en ce qu'il est prévu un dispositif d'immobilisation (102) entre ledit coulisseau (70) et ledit levier à came (66) pour immobilier le coulisseau (70) en des positions voulues le long du levier (66).
5. Machine à spiraler les ressorts actionnable cycliquement selon la revendication 2, caractérisée en ce que lesdits moyens de réglage de longueur d'alimentation en fil (70, 98) revêtent la forme d'un coulisseau (70) réuni par une liaison pivotante avec ledit dispositif de connexion (90) et déplaçable le long dudit levier à came (66) pour se rapprocher et s'eloigner du suiveur de came (64), lesdits moyens comprenant également un petit dispositif (108) actionné par de l'énergie et monté entre le levier (66) et le coulisseau (70) pour régler la position du coulisseau (70) pendant le fonctionnement de la machine.
6. Machine à spiraler les ressorts actionnable cycliquement selon la revendication 5, caractérisée en ce que ledit dispositif actionné par de l'énergie revêt la forme d'un moteur léger (108) monté sur le levier à came au voisinage de son extrémité réunie au suiveur de came et une vis de réglage associée (98b) entraînée par ledit moteur et réunie opérativement avec le coulisseau (70) prévu sur le levier (66).
7. Machine à spiraler les ressorts actionnable cycliquement selon la revendication 6, caractérisée en ce qu'il est prévu un second dispositif actionné par de l'énergie (110) pour immobiliser la position du coulisseau (70) le long du levier à came (66) et en ce que ce dispositif est actionnable sélectivement pendant le fonctionnement de la machine pour immobiliser le coulisseau (70) dans des positions choisies.
8. Machine à spiraler les ressorts actionnable cycliquement selon la revendication 1, caractérisée en ce que ledit pignon d'entrée (74) adapté à l'entraînement desdits galets d'alimentation (12-18) revêt la forme d'un pignon (74) et en ce que lesdits moyens de connexion prévus entre ledit levier à came et ledit pignon comprennent des moyens à crémaillére (88) opérativement associés avec le pignon (74).
9. Machine à spiraler les ressorts actionnable cycliquement selon la revendication 8, caractérisée en ce que ledit dispositif de connexion comprend un logement (94) monté sur un arbre (76) portant ledit pignon (74) et déplaçable sur au moins une partie limitée d'arc et en ce que la crémaillère (88) est reçue à glissement et maintenue dans ledit logement pour engrener avec ledit pignon (74).
10. Machine à spiraler les ressorts actionnable cycliquement selon la revendication 8, caractérisée en ce que lesdits moyens à crémaillère (88) sont maintenus selon un chemin fixe en engrènement avec ledit pignon (74) pour un mouvement alternatif linéaire et en ce que ledit dispositif de connexion comprend un bras de connexion (90) monté pivotant à l'une des extrémités de ladite crémaillère (88), l'autre extrémité dudit bras étant réunie à ladite partie d'extrémité dudit levier à came (66).
EP80902097A 1979-10-09 1980-10-02 Machine d'enroulement de ressorts avec moyens ameliores d'entrainement des cylindres d'alimentation Expired EP0037415B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8267079A 1979-10-09 1979-10-09
US82670 1979-10-09

Publications (3)

Publication Number Publication Date
EP0037415A1 EP0037415A1 (fr) 1981-10-14
EP0037415A4 EP0037415A4 (fr) 1982-01-26
EP0037415B1 true EP0037415B1 (fr) 1984-04-18

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EP80902097A Expired EP0037415B1 (fr) 1979-10-09 1980-10-02 Machine d'enroulement de ressorts avec moyens ameliores d'entrainement des cylindres d'alimentation

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Country Link
EP (1) EP0037415B1 (fr)
JP (1) JPH037456B2 (fr)
AT (1) ATE7117T1 (fr)
CA (1) CA1144041A (fr)
DE (1) DE3067556D1 (fr)
FR (1) FR2467028B1 (fr)
IT (1) IT8068560A0 (fr)
MX (1) MX154096A (fr)
WO (1) WO1981000974A1 (fr)

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CN112186986A (zh) * 2020-10-13 2021-01-05 武义县达香电子有限公司 一种带有自动裁剪的转子线束套取装置

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US4503694A (en) * 1981-08-26 1985-03-12 Shinko Kikaikogyo Kabushiki Kaisha Spring manufacturing machine equipped with two motors
SE508675C2 (sv) * 1997-01-27 1998-10-26 Multivent Consult Ab Anordning för böjning av fjäder för resårmadrasser
CN106180488B (zh) * 2016-07-28 2018-03-20 瑞安市旭东冲压机械厂 用于冲裁弹簧垫的高速冲切机
CN112091479B (zh) * 2020-08-19 2022-08-23 武汉凌云光电科技有限责任公司 一种用于制备锡环的夹紧绕环组件、自动锡环制备装置和方法

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FR1315882A (fr) * 1961-12-11 1963-01-25 Perfectionnements au mouvement d'entraînement par à-coups de produits en bande mince continue
GB1012802A (en) * 1963-06-14 1965-12-08 Bennett Tools Ltd Apparatus for use in feeding wire or strip material
GB1127990A (en) * 1966-08-09 1968-09-25 Bennett Tools Ltd Apparatus for use in feeding wire or strip material
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Publication number Priority date Publication date Assignee Title
CN112186986A (zh) * 2020-10-13 2021-01-05 武义县达香电子有限公司 一种带有自动裁剪的转子线束套取装置

Also Published As

Publication number Publication date
IT8068560A0 (it) 1980-10-09
DE3067556D1 (en) 1984-05-24
EP0037415A1 (fr) 1981-10-14
ATE7117T1 (de) 1984-05-15
EP0037415A4 (fr) 1982-01-26
MX154096A (es) 1987-05-07
JPS56501395A (fr) 1981-10-01
WO1981000974A1 (fr) 1981-04-16
FR2467028A1 (fr) 1981-04-17
CA1144041A (fr) 1983-04-05
FR2467028B1 (fr) 1985-12-06
JPH037456B2 (fr) 1991-02-01

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