EP0398829B1 - Negative dobby with oscillating swing levers for looms - Google Patents

Negative dobby with oscillating swing levers for looms Download PDF

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Publication number
EP0398829B1
EP0398829B1 EP90420236A EP90420236A EP0398829B1 EP 0398829 B1 EP0398829 B1 EP 0398829B1 EP 90420236 A EP90420236 A EP 90420236A EP 90420236 A EP90420236 A EP 90420236A EP 0398829 B1 EP0398829 B1 EP 0398829B1
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EP
European Patent Office
Prior art keywords
hook
dobby
lock
bearing face
pivot axis
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
EP90420236A
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German (de)
French (fr)
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EP0398829A1 (en
Inventor
Joseph Palau
Jean-Paul Froment
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Staubli Faverges SCA
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Staubli Faverges SCA
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Publication of EP0398829A1 publication Critical patent/EP0398829A1/en
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Publication of EP0398829B1 publication Critical patent/EP0398829B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D03C1/14—Features common to dobbies of different types
    • D03C1/20—Hooks; Lifters

Definitions

  • the present invention relates to negative dobbies of the oscillating scale type, intended for controlling heald frames on weaving looms.
  • Figs. 1 and 2 of the attached drawing substantially reproduce FIGS. 3 and 4 of the above-mentioned request.
  • the reference 1 designates one of the balances of the dobby, moved cyclically around its point of articulation 2 by the two rear crosspieces 3, which form supports for the heel of the hooks 4 articulated at 5 at the ends of said balance 1
  • the articulation point 2 of the balance 1 is carried by a lever 6 coupled to the corresponding heald frame, the movements of the latter being controlled by a reading device 7 common to all the scales of the dobby.
  • each hook 4 is associated with a lock 8 with two arms, which is articulated on an axis 9 so as to tilt in one direction or the other under the effect of a pusher 10 actuated by the device. reading 7. It should be observed that the axis 9, thus disposed between the pivot 5 of the hook 4 considered and the bearing face 4 a of this hook with which the lock 8 is intended to cooperate by one of its arm, is located, not strictly on the straight line YZ or line of force which connects said axis 5 and face 4 a , but in an offset manner (distance d ) with respect to said straight line towards the outside, that is to say say in the direction of the body of the hook 4 conjugate, so as to generate a torque which tends to rotate the latch 8 and thus to apply the internal face of the hook 4 against the axis 9.
  • distance d offset manner
  • the locks 8 work in compression, so that they can have, to withstand without damage equivalent resistant forces, a reduced mass compared to conventional hooks working in bending.
  • the present invention mainly aims to remedy, which relates to the negative dobby defined in claim 1.
  • the invention consists in having at the edge of each hook which is turned inwards a profiled notch to receive the hub of the corresponding lock which is thus wrapped thereby ensuring the positive retention of the hook against any risk of stalling, at the same time as shifting the pivot axis of this latch inward, that is to say in the direction of the pivot axis of the corresponding balance, relative to the line of force which joins the bearing face to the pivot axis of the envisaged hook.
  • figs. 1 and 2 reproduce fig. 3 and 4 of patent application No. 87 00297/2 609 476 to which the present invention refers.
  • Fig. 3 shows a hook-lock assembly of a dobby established in accordance with the invention.
  • Fig. 4 illustrates the operation of the assembly according to FIG. 3.
  • the reference 14 designates a (actually the lower bracket) of the two hooks 15 pivoted at the ends of each balance 1, said hook 14 having a bearing face 14 is intended to cooperate with the end of the one of the two arms of a latch 18 mounted oscillating on an axis 19 and connected by a pusher 10 to the reading device, all as in fig. 1 and 2.
  • the hook 14 is positively retained in the three orientations N, S and O by the edge of its notch 14 b , and, in the fourth orientation E, by applying its bearing face 14 a against the end of the latch arm, apart from the declawing clearance.
  • the reversal of the offset of the axis 19 makes it possible to shorten and lighten both the hooks 14 of the dobby and the latches 18 associated with these, and this because said hooks require a less pronounced curvature at the same time as the length of the locks is likely to be reduced by avoiding any risk of interference at the level of the path X of the beak of each hook .
  • the overall size of the assembly is consequently reduced, which always constitutes a significant advantage in the construction of the dobbies.
  • the lightness conferred on the latches and the hooks makes it possible to reduce the inertia presented by these moving parts and to increase the speed of operation of the dobby, while limiting the efforts developed by the reading device for actuating the associated pushers 10 said locks.
  • the invention is applicable to dobbies of the "pulled scales" type in which the reciprocating movement of each balance 4 is no longer provided by thrust crosspieces, but by traction members in the form of hooks pivotally mounted on a pendulum disposed in front of the scales and connected to the dobby drive device in order to oscillate alternately in one direction and in the other, said members being controlled by the reading device of the dobby in order to ensure the actuation of each balance according to the weave of the fabric to be produced, in the manner described in US patent No. 4,386,631 MIZOGUCHI.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Knitting Machines (AREA)

Description

La présente invention a trait aux ratières négatives du type à balances oscillantes, destinées à la commande des cadres de lisses sur les métiers à tisser.The present invention relates to negative dobbies of the oscillating scale type, intended for controlling heald frames on weaving looms.

Dans la Demande de Brevet français N° 87 00297/2 609 476, on a décrit une ratière négative perfectionnée dans laquelle chacun des deux crochets articulés montés sur chaque balance coopérait avec un organe pivotant constitué par un verrou disposé entre la face d'appui du crochet envisagé et l'axe d'articulation de ce dernier sur la balance.In French Patent Application No. 87 00297/2 609 476, an improved negative dobby was described in which each of the two articulated hooks mounted on each scale cooperated with a pivoting member constituted by a latch disposed between the bearing face of the envisaged hook and the axis of articulation of the latter on the scale.

Les fig. 1 et 2 du dessin ci-joint reproduisent substantiellement les fig. 3 et 4 de la Demande sus-mentionnée. En fig. 1, la référence 1 désigne l'une des balances de la ratière, déplacée cycliquement autour de son point d'articulation 2 par les deux traverses arrière 3, lesquelles forment appuis pour le talon des crochets 4 articulés en 5 aux extrémités de ladite balance 1. Le point d'articulation 2 de la balance 1 est porté par un levier 6 attelé au cadre de lisses correspondant, les déplacements de ce dernier étant commandés par un dispositif de lisage 7 commun à toutes les balances de la ratière.Figs. 1 and 2 of the attached drawing substantially reproduce FIGS. 3 and 4 of the above-mentioned request. In fig. 1, the reference 1 designates one of the balances of the dobby, moved cyclically around its point of articulation 2 by the two rear crosspieces 3, which form supports for the heel of the hooks 4 articulated at 5 at the ends of said balance 1 The articulation point 2 of the balance 1 is carried by a lever 6 coupled to the corresponding heald frame, the movements of the latter being controlled by a reading device 7 common to all the scales of the dobby.

A cet effet, à chaque crochet 4 est associé un verrou 8 à deux bras, qui est articulé sur un axe 9 de façon à basculer dans un sens ou dans l'autre sous l'effet d'un poussoir 10 actionné par le dispositif de lisage 7. Il convient d'observer que l'axe 9, ainsi disposé entre le pivot 5 du crochet 4 considéré et la face d'appui 4a de ce crochet avec laquelle le verrou 8 est destiné à coopérer par l'un de ses bras, se trouve situé, non pas strictement sur la droite Y-Z ou ligne de force qui relie lesdits axe 5 et face 4a, mais de manière décalée (distance d) par rapport à ladite droite vers l'extérieur, c'est-à-dire en direction du corps du crochet 4 conjugé, de façon à engendrer un couple qui tend à faire tourner le verrou 8 et à appliquer ainsi la face interne du crochet 4 contre l'axe 9.For this purpose, each hook 4 is associated with a lock 8 with two arms, which is articulated on an axis 9 so as to tilt in one direction or the other under the effect of a pusher 10 actuated by the device. reading 7. It should be observed that the axis 9, thus disposed between the pivot 5 of the hook 4 considered and the bearing face 4 a of this hook with which the lock 8 is intended to cooperate by one of its arm, is located, not strictly on the straight line YZ or line of force which connects said axis 5 and face 4 a , but in an offset manner (distance d ) with respect to said straight line towards the outside, that is to say say in the direction of the body of the hook 4 conjugate, so as to generate a torque which tends to rotate the latch 8 and thus to apply the internal face of the hook 4 against the axis 9.

On obtient de la sorte une position d'appui parfaitement stable. Par ailleurs et surtout, les verrous 8 travaillent à la compression, si bien qu'ils peuvent présenter, pour supporter sans dommage des efforts résistants équivalents, une masse réduite par rapport aux crochets classiques travaillant à la flexion.In this way, a perfectly stable support position is obtained. Furthermore and above all, the locks 8 work in compression, so that they can have, to withstand without damage equivalent resistant forces, a reduced mass compared to conventional hooks working in bending.

Les études ont néanmoins démontré que quels que soient les avantages obtenus, une telle structure comportait encore des inconvénients non négligeables en pratique.Studies have nonetheless demonstrated that whatever the advantages obtained, such a structure still has significant drawbacks in practice.

Il faut en premier lieu remarquer que la tenue ou accrochage du crochet 4 sur le verrou 9 n'est pas positif. De ce fait, sous l'effet des vibrations inhérentes au fonctionnement de la ratière, ainsi que des variations de la force de rappel qui s'exerce sur chaque crochet 4, il existe un risque important de décrochage intempestif auquel il y a lieu de pallier à l'aide de butées additionnelles, coûteuses et sujettes à usure.It should first be noted that the holding or hooking of the hook 4 on the latch 9 is not positive. As a result, under the effect of the vibrations inherent in the operation of the dobby, as well as variations in the restoring force which is exerted on each hook 4, there is a significant risk of untimely stalling which must be compensated for. using additional, expensive and wear-resistant stops.

On conçoit par ailleurs que le déport latéral d des axes 9 vers l'extérieur par rapport à la ligne de force Y-Z oblige à conférer aux crochets 4 une courbure prononcée qui implique nécessairement une grande longueur. En effet et compte tenu de la trajectoire relative X entre le bec du crochet 4 et l'axe 9, il y a lieu, pour éviter toute interférence, d'éloigner ledit axe 9 de la face d'appui 4a, et donc d'allonger le crochet 4 ainsi que le verrou 8. La matière constitutive de chaque crochet 4 se trouve ainsi éloignée de la ligne de force Y-Z et elle est soumise à un moment fléchissant important qui nécessite de donner audit crochet une grande section résistante. Il en résulte finalement des crochets 4 longs, chers et lourds, qui engendrent des forces d'inertie élevées, sources de vibrations intempestives.It will also be understood that the lateral offset d of the axes 9 outwards with respect to the line of force YZ makes it necessary to give the hooks 4 a pronounced curvature which necessarily implies a great length. Indeed, and taking into account the relative path X between the hook beak 4 and the axis 9, it is necessary, to avoid any interference, to move said axis 9 away from the bearing face 4 a , and therefore d 'elongate the hook 4 and the latch 8. The material of each hook 4 is thus distant from the line of force YZ and it is subjected to a significant bending moment which requires giving said hook a large resistant section. This ultimately results in long, expensive and heavy hooks 4, which generate high inertia forces, sources of untimely vibrations.

C'est à ces inconvénients qu'entend principalement remédier la présente invention, laquelle a pour objet la ratière négative définie à la revendication 1.It is to these drawbacks that the present invention mainly aims to remedy, which relates to the negative dobby defined in claim 1.

En fait l'invention consiste à faire comporter au bord de chaque crochet qui est tourné vers l'intérieur une encoche profilée pour recevoir le moyeu du verrou correspondant qui se trouve ainsi enveloppé en assurant de ce fait la retenue positive du crochet à l'encontre de tout risque de décrochage, en même temps qu'à décaler l'axe de pivotement de ce verrou vers l'intérieur, c'est-à-dire en direction de l'axe de pivotement de la balance correspondante, par rapport à la ligne de force qui réunit la face d'appui à l'axe de pivotement du crochet envisagé.In fact the invention consists in having at the edge of each hook which is turned inwards a profiled notch to receive the hub of the corresponding lock which is thus wrapped thereby ensuring the positive retention of the hook against any risk of stalling, at the same time as shifting the pivot axis of this latch inward, that is to say in the direction of the pivot axis of the corresponding balance, relative to the line of force which joins the bearing face to the pivot axis of the envisaged hook.

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :The attached drawing, given as an example, will allow a better understanding the invention, the characteristics which it presents and the advantages which it is capable of providing:

Comme indiqué ci-dessus, les fig. 1 et 2 reproduisent les fig. 3 et 4 de la demande de brevet N° 87 00297/2 609 476 à laquelle la présente invention se refère.
   Fig. 3 représente un ensemble crochet-verrou d'une ratière établie conformément à l'invention.
   Fig. 4 illustre le fonctionnement de l'ensemble suivant fig. 3.As indicated above, figs. 1 and 2 reproduce fig. 3 and 4 of patent application No. 87 00297/2 609 476 to which the present invention refers.
Fig. 3 shows a hook-lock assembly of a dobby established in accordance with the invention.
Fig. 4 illustrates the operation of the assembly according to FIG. 3.

En fig. 3, la référence 14 désigne l'un (en fait le crochet inférieur) des deux crochets articulés en 15 aux extrémités de chaque balance 1, ledit crochet 14 présentant une face d'appui 14a destinée à coopérer avec l'extrémité de l'un des deux bras d'un verrou 18 monté oscillant sur un axe 19 et relié par un poussoir 10 au dispositif de lisage, le tout comme en fig. 1 et 2.In fig. 3, the reference 14 designates a (actually the lower bracket) of the two hooks 15 pivoted at the ends of each balance 1, said hook 14 having a bearing face 14 is intended to cooperate with the end of the one of the two arms of a latch 18 mounted oscillating on an axis 19 and connected by a pusher 10 to the reading device, all as in fig. 1 and 2.

Il convient toutefois d'observer :

  • d'une part que l'axe 19 est déporté vers l'intérieur par rapport à la ligne de force Y-Z ;
  • d'autre part que chaque crochet 14 est profilé pour comporter, sur son bord tourné vers l'intérieur de la ratière, une encoche 14b propre à envelopper le moyeu 18a du verrou 18 (ou tout au moins l'axe de pivotement 19 de celui-ci).
However, it should be noted:
  • firstly that the axis 19 is offset inwardly relative to the line of force YZ;
  • on the other hand that each hook 14 is profiled to have, on its edge facing the inside of the dobby, a notch 14b suitable for enveloping the hub 18 a of the lock 18 (or at least the pivot axis 19 of it).

On comprend qu'une telle structure s'oppose radicalement à tout risque de décrochage intempestif du crochet 14 par rapport au verrou 18, et ce quelle que soit l'importance des vibrations de la ratière en cours de fonctionnement et des variations qui affectent les efforts auxquels sont soumis les crochets 14 pendant l'opération de tissage.We understand that such a structure is radically opposed to any risk of untimely detachment of the hook 14 relative to the latch 18, regardless of the importance of the vibrations of the dobby during operation and of the variations which affect the forces. to which the hooks 14 are subjected during the weaving operation.

Effectivement, en dépit du sens du déport de l'axe 19 par rapport à la ligne de force Y-Z, le crochet 14 se trouve positivement retenu dans les trois orientations N, S et O par le bord de son encoche 14b, et, dans la quatrième orientation E, par l'application de sa face d'appui 14a contre l'extrémité du bras du verrou, au jeu de dégriffage près.Indeed, despite the direction of the offset of the axis 19 with respect to the line of force YZ, the hook 14 is positively retained in the three orientations N, S and O by the edge of its notch 14 b , and, in the fourth orientation E, by applying its bearing face 14 a against the end of the latch arm, apart from the declawing clearance.

Au surplus, l'inversion du déport de l'axe 19 permet de raccourcir et d'alléger aussi bien les crochets 14 de la ratière que les verrous 18 associés à ceux-ci, et ce du fait que lesdits crochets nécessitent une courbure moins prononcée en même temps que la longueur des verrous est susceptible d'être réduite en évitant tout risque d'interférence au niveau de la trajectoire X du bec de chaque crochet.In addition, the reversal of the offset of the axis 19 makes it possible to shorten and lighten both the hooks 14 of the dobby and the latches 18 associated with these, and this because said hooks require a less pronounced curvature at the same time as the length of the locks is likely to be reduced by avoiding any risk of interference at the level of the path X of the beak of each hook .

L'encombrement de l'ensemble est en conséquence réduit, ce qui constitue toujours un avantage sensible dans la construction des ratières. La légèreté conférée aux verrous et aux crochets permet de réduire l'inertie présentée par ces pièces mobiles et d'accroître la vitesse de fonctionnement de la ratière, tout en limitant les efforts développés par le dispositif de lisage pour l'actionnement des poussoirs 10 associés auxdits verrous.The overall size of the assembly is consequently reduced, which always constitutes a significant advantage in the construction of the dobbies. The lightness conferred on the latches and the hooks makes it possible to reduce the inertia presented by these moving parts and to increase the speed of operation of the dobby, while limiting the efforts developed by the reading device for actuating the associated pushers 10 said locks.

On conçoit que l'invention est applicable aux ratières du type "à balances tirées" dans lesquelles le déplacement alternatif de chaque balance 4 est assuré, non plus par des traverses de poussée, mais par des organes de traction en forme de crochets montés à pivotement sur un balancier disposé en avant des balances et relié au dispositif d'entraînement de la ratière afin d'osciller alternativement dans un sens et dans l'autre, lesdits organes étant commandés par le dispositif de lisage de la ratière en vue d'assurer l'actionnement de chaque balance en fonction de l'armure du tissu à réaliser, à la manière décrite dans le brevet U.S.A. N° 4 386 631 MIZOGUCHI.It will be appreciated that the invention is applicable to dobbies of the "pulled scales" type in which the reciprocating movement of each balance 4 is no longer provided by thrust crosspieces, but by traction members in the form of hooks pivotally mounted on a pendulum disposed in front of the scales and connected to the dobby drive device in order to oscillate alternately in one direction and in the other, said members being controlled by the reading device of the dobby in order to ensure the actuation of each balance according to the weave of the fabric to be produced, in the manner described in US patent No. 4,386,631 MIZOGUCHI.

Claims (1)

  1. Negative dobby incorporating swinging levers for a weaving loom, of the type in which each of the ends of each swinging lever is provided with a pin on which is articulated a hook which cooperates with a lock mounted to pivot on a pin in order to bear, by pivoting under the effect of the reading device of the dobby, against a bearing face of the hook in question, characterized in that each hook presents, on its inwardly facing edge, a notch provided to receive the hub of the lock in order to ensure positive retention, in all directions, of said hook when the bearing face thereof is applied against the lock, whilst the pivot axis of this lock is offset inwardly, i.e. in the direction of the pivot axis of the corresponding swinging lever, with respect to the line of force joining the bearing face to the pivot axis of the hook envisaged.
EP90420236A 1989-05-19 1990-05-17 Negative dobby with oscillating swing levers for looms Expired - Lifetime EP0398829B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8906826A FR2647124B1 (en) 1989-05-19 1989-05-19 NEGATIVE RATIERE WITH OSCILLATING SCALES FOR WEAVING
FR8906826 1989-05-19

Publications (2)

Publication Number Publication Date
EP0398829A1 EP0398829A1 (en) 1990-11-22
EP0398829B1 true EP0398829B1 (en) 1993-09-01

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Application Number Title Priority Date Filing Date
EP90420236A Expired - Lifetime EP0398829B1 (en) 1989-05-19 1990-05-17 Negative dobby with oscillating swing levers for looms

Country Status (10)

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US (1) US5031667A (en)
EP (1) EP0398829B1 (en)
JP (1) JPH03834A (en)
KR (1) KR0133657B1 (en)
BR (1) BR9002213A (en)
CZ (1) CZ278227B6 (en)
DE (1) DE69003006T2 (en)
ES (1) ES2043332T3 (en)
FR (1) FR2647124B1 (en)
RU (1) RU1769769C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2690465A1 (en) * 1992-04-28 1993-10-29 Staubli Trumpelt Gmbh Maschine Locking and preselection device for heavy dobbies of the firm pitch type.
JP2866771B2 (en) * 1992-09-24 1999-03-08 富士写真フイルム株式会社 Single-sheet unit
CN101724953B (en) * 2009-11-11 2011-04-27 常熟市常纺纺织机械有限公司 Draw hook rapid resetting mechanism for negative dobby shedding device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1343419A (en) * 1963-01-15 1963-11-15 Staubli Geb & Co Double-lift armor mechanics
JPS6017859B2 (en) * 1980-02-07 1985-05-07 株式会社山田ドビ− Passive double acting dobby machine
FR2543172B1 (en) * 1983-03-22 1985-10-25 Staubli Sa Ets IMPROVEMENTS ON BALANCE RATIERS FOR WEAVING
FR2609476B1 (en) * 1987-01-09 1990-12-07 Staubli Sa Ets IMPROVEMENTS ON NEGATIVE RATIERS OF THE OSCILLATING BALANCE TYPE
FR2610644A1 (en) * 1987-02-05 1988-08-12 Staubli Sa Ets Improvements to negative dobbies of the swing balance type

Also Published As

Publication number Publication date
JPH0360939B2 (en) 1991-09-18
JPH03834A (en) 1991-01-07
FR2647124A1 (en) 1990-11-23
US5031667A (en) 1991-07-16
RU1769769C (en) 1992-10-15
DE69003006D1 (en) 1993-10-07
CS9002309A2 (en) 1991-08-13
KR0133657B1 (en) 1998-04-24
FR2647124B1 (en) 1991-07-12
EP0398829A1 (en) 1990-11-22
DE69003006T2 (en) 1994-03-10
ES2043332T3 (en) 1993-12-16
BR9002213A (en) 1991-08-13
CZ278227B6 (en) 1993-10-13
KR900018439A (en) 1990-12-21

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