EP0100288A1 - Jacquard machines with swivel-mounted hooks - Google Patents

Abstract

In an armor mechanism in which the selection of hooks is carried out by rotation of their rods so as to present their beaks to the blades of the claw frames or on the contrary to erase them, each hook comprises at the end a flat eyelet (13) which, when it returns to its low rest position, engages in a depression (22) with elliptical entry of a bottom board (21) and which tends to bring it back to the correct orientation corresponding to this position. In addition, to each eyelet (13) is attached an elastic blade (24) which passes through a slot (26) of a guide board and which acts like a return spring to complete the effect of the depression,

Description

The present invention refers to the mechanical double armor armor in which the hooks taken by one of the two claw frames which move vertically in opposite directions to each other, are angularly offset around the axis of their rod so as to escape from the other frame without having to extend for this purpose the duration of what is called the press, that is to say of the phase during which said hooks are selectively pushed back by the corresponding needles.

This mechanism, which can be said to have adjustable hooks, was described in French patent 72 13495 of April 11, 1972. Thanks to the reduction in press time, it has proved to be able to operate at considerably higher rates. to those of conventional mechanics. However, experience has shown that with trades working at very high speed, we sometimes witness selection mistakes. Thanks to a careful study of the behavior of the hooks on such looms, we were able to determine that it came from a defective orientation of these on the blades of the retaining frame. These blades should normally cause the spouts they support to be oriented exactly in vertical planes perpendicular to them; However, there are sometimes slight momentary angular deviations which, in the trades of the genre in question, can reach values such that the selective lifting of the hooks is affected.

The present invention aims to remedy this drawback.

In accordance with the invention, the hooks are retained in the low rest position no longer by a frame cooperating with retaining spouts, but by means of a fixed bottom board provided for each hook with a depression with a flared inlet at the bottom of which the lower end of the hook rod, shaped as an eyelet or the like is centered at a precise angular position relative to the axis of the rod.

According to another characteristic of the invention, this means of orienting the hook in question is supplemented by interposing between the lower end of the latter and the corresponding heddle an elastic strip which also slides in a slot in a board of fixed guide provided below the aforementioned bottom board. Thus this strip constantly tends to recall the hook to the intended rest orientation. Its elasticity allows rotations of 45 ° of the rod around its axis without opposing an annoying resistance, but it determines a restoring torque which avoids or limits any exaggerated rotation and contributes to. return the hook to its rest orientation.

• Fig. 1 est une vue schématisée d'une mécanique suivant l'invention, un seul des crochets de celle-ci étant représenté.
• Fig. 2 est une vue en élévation de ce crochet.
• Fig. 3 en est une vue en plan.
• Fig. 4 est une vue en perspective à grande échelle montrant la partie basse d'un crochet, la lamelle élastique qui lui est attachée, ainsi que la planche de fond et la planche de guidage qu'elle traverse.
• Fig. 5 et 6 sont des coupes à encore plus grande échelle suivant V-V et VI-VI.
• Fig. 7 est une vue en plan de la dépression montrée en fig. 5 et 6.

The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:

• Fig. 1 is a schematic view of a mechanism according to the invention, only one of the hooks thereof being shown.
• Fig. 2 is an elevational view of this hook.
• Fig. 3 is a plan view thereof.
• Fig. 4 is a perspective view on a large scale showing the lower part of a hook, the elastic strip attached to it, as well as the bottom board and the guide board through which it passes.
• Fig. 5 and 6 are sections on an even larger scale according to VV and VI-VI.
• Fig. 7 is a plan view of the depression shown in FIG. 5 and 6.

We have schematized in fig. 1 a mechanism comprising application of the present invention. This comprises hooks with a single rod, only one of which has been shown at 1. Each of them is controlled for selection by a needle 2 comprising a loop 2a which surrounds its rod. The needles 2 pass through a plate 3 and receive the selective action of stops 4 guided by another perforated plate 5. Each needle 4 is associated with a needle 6, which is able to cooperate with the perforated paper 7 of the mechanics. When a needle 6 meets a full of paper, it is raised and the stopper 4 thus comes into contact with a stopper 8 which oscillates horizontally, the needle 2 is then pushed back against the reaction of a spring R in causing the hook 1 considered.

In the case of a hole palpated by the needle, the stopper 4 escapes the action of the stopper 8 so that the hook is not pushed by the needle 2.

In fig. 2 and 3 we referenced 9 the rod of a hook. It carries at its upper end a first main spout 10 (fig. 2), then a little lower a second main spout 11, oriented in plan (fig. 3) at 90 ° from the previous one, 'then much lower still a retaining spout 12 arranged in plan along the bisector of the angle of the previous spouts. The lower end of the rod 9 is finally curved on itself in the form of an eyelet 13, which is incompletely closed in the embodiment shown, this eyelet being intended to be connected to the corresponding heald 14 (fig 1) in the way that will be explained later.

The main spouts 10 and 11 are intended to cooperate with the respective blades 15 of the upper claw frame 16 and 17 of the lower claw frame 18, these two frames coming and going vertically in opposite directions to each other. As for the retaining spout, it cooperates on its side with one of the blades 19 of the fixed frame of open pitch 20.

As described so far hook mechanics orientable according to the present invention is similar to that described in the patent mentioned above.

However in this prior mechanics the hooks 1 not raised were supported by means of a second fixed frame located below the open pitch frame 20 and on the blades of which the nozzles 12 came to rest, these blades ensuring their indicated orientation of rest in fig. 3, that is to say the retaining spout 12 considered lying exactly in a vertical plane perpendicular to the blades 15, 17 and 19. Instead of this, in accordance with the present invention there is provided for this purpose a board of bottom 21 hollowed out by depressions 22 in which the eyelets 13 are arranged. As shown in fig. 4 to 7, each depression 22 has in plan a roughly elliptical entry profile referenced 22a in FIG. 7, this profile comprising a major axis 22b. The width of the depression 22 decreases as it approaches its bottom so that in a vertical plane transverse to the major axis 22b, its profile is that of a cup, as indicated in 22c in fig. 6. In the vertical plane of the major axis 22b this profile is a half-circumference identical to that of the lower periphery of the eyelet 13.

The bottom of the depression 22 is perforated with a circular opening 23 whose profile is inscribed inside that 22a of the inlet of the depression 22.

Of course the major axes 22b are oriented so that when an eyelet 13 rests on the bottom of the corresponding depression 22, the retaining spout 12 of the hook of which this eyelet is secured is itself well oriented as shown in fig. 3.

On the eyelet 13 of each hook is also hung an elastic strip 24 (fig. 4) which passes through the opening 22 and at the lower end of which the corresponding beam 14 is fixed.

Below the bottom board 21, but still above the lower end of the strips 24 corresponding to hooks in the high position, that is to say which have been lifted by one of the claw frames ( 16, 18), there is provided a guide board 25 (fig. 4) pierced with narrow slots 26 for the passage of said strips 24. The slots 26 are oriented so that when a hook rests on the bottom of the depression 22 corresponding to the guide plate 21, its strip 24 has no twist.

• Lorsqu'un crochet 1 est au repos, son oeillet inférieure 23 repose dans la dépression 22 correspondante de la planche de fond 21 qui assure son orientation exacte à un très faible jeu près. On est donc assuré que dans une vue en plan telle que celle de fig. 3 le bec de retenue 12 est bien situé dans un plan vertical perpendiculaire aux arêtes des lames 15, 17, 19.

The operation is as follows:

• When a hook 1 is at rest, its lower eyelet 23 rests in the corresponding depression 22 of the bottom board 21 which ensures its exact orientation with very little play. It is therefore assured that in a plan view such as that of FIG. 3 the retaining spout 12 is well located in a vertical plane perpendicular to the edges of the blades 15, 17, 19.

From this rest position, when the hook 1 considered has been selected, everything takes place as indicated in the aforementioned patent, the part of the strip 24 located between the guide plate 25 and the eyelet 13 opposing only a very weak torsional reaction to the 45 ° rotation of the rod 9 around its axis in one direction or the other. So when one of the main spouts, 10 for example, has been taken by a frame of claws and is raised and lowered by it, the other 11 is practically oriented parallel to the blades and does not risk being hooked by one of those in the other frame.

When the hook returns to the low position, its lower eyelet 13 engages in the elliptical inlet 22a of the depression 22 which ensures its centering, so that even if due to the speed of travel and the passive resistances, the spout of retainer 12 was not perfectly oriented perpendicular to the blades, this error would be automatically corrected by the action of the walls of the depression on the eyelet when the latter is pressed into it.

Furthermore, the elastic strip 24 exerts on the eyelet 13 a return torque which tends to precisely bring the hook back to the angular position of FIG. 3 and which therefore contributes to ensuring this correct orientation of the latter at rest. In addition, this lamella, the reaction torque of which increases rapidly with the torsion angle, opposes any exaggerated rotation of the rod 9 which could result in one of the main spouts being able to meet a blade intended for another hook (for example the blade _. located above the rod 9 in fig. 3).

The invention has therefore made it possible to produce a mechanism with orientable hooks in which the correct orientation of the hooks in the low or rest position is ensured in a certain manner despite vibrations, inertia effects and other parasitic actions, which allows to operate it at higher speeds than those reached so far, without the risk of seeing selection faults appear.

One could possibly dispense with the elastic strip 24 and the guide plate 25, the return of the eyelet 13 and the rod 19 to the desired angular position being ensured only by the depression 22. It would also be possible to combine the guide plate 25 with that of the bottom plate 21 at the price, of course, of a shortening of the lamellae 24. It will also be noted that the invention would remain applicable even if the mechanics did not include an open pitch frame 20, the nozzles retainer 12 then being removed. Finally we could also use a flat collar without buckle.

Claims (4)

1. Double armor armor mechanism with orientable hooks, of the type in which each of said hooks comprises a single rod secured to two main nozzles angularly offset relative to each other by approximately 90 ° around the axis of the rod and adapted to cooperate with one or the other of the two claw frames of the mechanics, as well as a lower eyelet or the like intended to ensure the connection with the corresponding heald, while means are provided for vertically retaining the hooks in the lowered rest position and for ensuring that their main spouts are oriented at approximately 45 ° in one direction and in the other with respect to the blades of the aforementioned frames, characterized in that said retaining means consist of a bottom board (21) in which is hollowed out for each hook (1) a depression (22) with a flared inlet suitable for receiving the lower end or eyelet (13) thereof and for bringing it with its rod (19) and its pri beaks ncipaux (10, 11) at the exact orientation provided for the aforementioned rest position, the bottom of this depression (22) comprising a perforation (23) for the passage of the connection with the corresponding beam (14) in the known manner in the arcade boards. 2. Mechanics according to claim 1, characterized in that each depression (22) has an inlet with a planar profile (22a) roughly elliptical, the major axis (22b) of which is substantially in the mean plane of the eyelet (13) when the rod (19) of the hook (1) considered is in the orientation corresponding exactly to the rest position of the latter, this entry gradually leading to a housing suitable for receiving said eyelet (13) with a reduced angular clearance clearance . 3. Mechanics according to claim 2, characterized in that in the vertical plane of the major axis (22b) of the inlet (22a) of the depression (22), the profile of the latter corresponds to that of the lower part of the periphery of the extrem lower half or eyelet (13), hook (1). 4. Mechanics according to any one of the preceding claims, characterized in that between the eyelet (13) or the like of the lower end of each hook (1) and the corresponding heald (14) is interposed an elastic strip ( 26) and in that between the guide board (21) and the level of the lower end of this strip (24) when the hook concerned (1) is in the raised position, there is a fixed guide board ( 25) pierced with individual slots (26) for the passage of said strips (24), the orientation of these slots (26) being such that the strips (24) are not subjected to any torque when the hook (1) finds in its lowered position of rest.

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