EP0055199A1 - Shedding mechanism of the Verdol or Jacquard type having means to assure an easy crossing of the hooks - Google Patents

Abstract

The hook according to the invention comprises an upper hairpin- shaped part (1) and a lower shank (2) resting against the bottom board (7). Each of the branches (4, 5) has a boss (4b, 5b) intended for interacting with the bars (11a, 11b) of a stationary regulator. The bosses bear against the bars (11a, 11b) at the moment of crossing of the grippers (9a, 10a) respectively of the lower frame (9) and of the upper frame (10), in such a way that the beard (5a) of the branch not grasped by a gripper is not affected by the displacement of the other. <IMAGE>

Description

We know that in the armor mechanics of the Verdol or Jacquard kind, used in connection with a loom, there are hooks ensuring the opening of the crowd of the loom thanks to their movements controlled by two claw frames. Simultaneously while some hooks go down, others go up. The usual double branch hooks must be deformed when the frames cross, otherwise the descending hook would be hooked by the rising frame. So in the closed step of the warp threads, the free arm of the hook is acted on by means of a needle controlled by one of the elements of a train of bars. This operation which consists in moving the needles longitudinally is called the "press".

The reading and the press action of the needles are carried out before the hooks are taken over by one or other of the claw frames, that is to say in their high and / or low positions. In the case where the hooks have a double branch, the press must be maintained until the claws have been crossed. This requires a very rapid movement of the paper which must occur in the very short time during which the press is released. In addition, this prohibits turning the mechanics upside down.

The improvements which are the subject of the present invention aim at eliminating the press operation of the hooks when the crowd is in the closed step position, thus a double mechanical lift according to the invention comprises hooks affecting the general shape of a tuning fork, that is to say that they have a hairpin part extended downwards by a straight rod at the end of which is attached the harness. Each branch of the hooks is provided with a deformation or bump directed towards the outside or the inside and suitable for cooperating with a racket whose bars or rods ensure the appropriate position of the branches of each hook by cooperation with his bumps. Thus the press is not necessary for crossing the claws, it can be released as soon as the hooks are taken over by the corresponding claws. This way we have a much longer time to move the paper.

• Fig. 1 à 12 illustrent les différentes positions d'un crochet d'une mécanique établie conformément à l'invention ; on observe qu'en fig. 5 et 11, qui correspondent à la position de pas clos, l'action des barreaux de la raquette sur les bosses du crochet permet un croisement aisé des cadres de griffes.

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 to 12 illustrate the different positions of a hook of a mechanism established in accordance with the invention; we observe that in fig. 5 and 11, which correspond to the closed step position, the action of the bars of the racket on the hook bumps allows easy crossing of the claw frames.

Fig. 13 to 24 are views similar to those of FIG. l to 12, but corresponding to a variant in which the shape of the hooks is modified so as to correspond to an inverted press, that is to say that from rest the hooks are actuated by the claws only they are pressed.

Fig. 25 to 27 show an alternative embodiment of a hook as illustrated in FIG. 1 to 12 but intended to operate with a single racket.

As shown in fig. 1 to 12, the hooks used in accordance with the present invention have the shape of a tuning fork, that is to say that they firstly comprise an upper part 1 in the form of a hairpin and a lower rod 2 which starts from the rounded connection 3 between the two vertical branches 4 and 5 of the part 1. The lower end of the rod 2 is associated with a ring 6 intended to rest in a cavity 7a of complementary shape formed in the board of usual background 7 of an armor mechanism. To the ring 6 is attached a heddle 8 shown in broken lines.

The free end of each of the branches 4, 5 of the upper part 1 of each hook is turned over so as to constitute a spout 4a respectively 5a. These spouts are intended to cooperate with the claws 9a, 10a of a lower frame 9 respectively upper 10. In the usual manner the two frames move vertically through a position in which the claws 9a, 10a are in the same plane . The claws 10a of the upper frame can also come below those 9a of the lower frame. Since such an arrangement is well known in practice, it is not necessary to describe further the production of such frames. It will be observed, however, that the figures of the appended drawing are schematic and do not claim to represent in a precise manner how the claw frames intersect.

The branches 4, 5 of the upper part 1 of the hooks are provided with camberings or bumps 4b, 5b oriented towards the outside and located at the same level. The mechanism according to the invention also comprises a racket 11 comprising rods 11a, 11b located on either side of the branches 4 and 5 of the hook. Two grids 12 and 13 respectively have also been provided, the bars 12a, 13a being arranged on either side of the racket 11 respectively above and below the rods llb, that is to say that the said bars are on the side of each hook opposite to that which faces the direction of the normal press.

In the usual way the rod 2 of each hook is provided with a spout 2a intended to cooperate with a blade 14 when it is desired to maintain the hook in the open step position. We also observe the presence of a needle 15 comprising an eyelet 15a crossed by the rod 2 of each hook.

• Fig. 1 représente un crochet à la position de repos, l'anneau 6 reposant dans la cavité 7a ménagée dans la planche de fond 7. On observe que le bec 4a de sa branche 4 se trouve au-dessus de la griffe 9a de telle sorte que si le cadre 9 s'élève il entraîne la montée du crochet (fig. 2). On note que la position basse du crochet est stable du fait que sa branche 4 repose contre la griffe 9a et que la bosse 5b de la branche 5 est en appui contre le barreau 13a.

The operation of an armor mechanism comprising the improvements according to the invention follows from the foregoing explanations:

• Fig. 1 represents a hook in the rest position, the ring 6 resting in the cavity 7a formed in the bottom board 7. It is observed that the spout 4a of its branch 4 is located above the claw 9a so that if the frame 9 rises it causes the hook to rise (fig. 2). It is noted that the low position of the hook is stable because its branch 4 rests against the claw 9a and that the boss 5b of the branch 5 is in abutment against the bar 13a.

The elevation of the hook results in cooperation of its branch 5 with the claw 10a of the frame 10 in the downward movement except during the period of crossing of the claws. At top dead center, the bump 5b cooperates with the bar 12a.

When the frame 9 goes back down, it leaves the hook in the high position because its beak 2a comes to rest against the blade 14 of open step (fig. 3). Again the hook is in a stable position thanks to the cooperation of its branch 4 with the claw 9a and that of its bump 5b with the bar 12a.

Starting from the position of fig. 3 if it is desired to descend the hook by cooperation of its beak 4a with the claw 9a (fig. 4), it is necessary to move the needle 15 to the right to exert a press on the rod 2 so that its beak 2a escapes the blade 14. We then return to the position of FIG. 1 after the press has been canceled.

It is easily understood that if the frames 9 and 10 intersect it is essential that the spout 5a of the branch 5 of the hook is not hooked by the corresponding claw 10a of the frame 10 when the latter goes back up, otherwise the hook itself s 'would elevate contrary to the information read by the needle. It is under these conditions that the rod llb of the racket 11 acts. When the hook descends, suspended from the frame 9, its hump 5b comes to cooperate with the rod llb so that the corresponding branch 5 of the hook is deformed towards the left in fig. 5 so that the spout 5a escapes the action of the claw 10a. It is noted that, in accordance with the invention, the claws are crossed without any press being applied to the needle 15.

If starting from the position of fig. 1, it is desired that the hook remains in abutment against the bottom board, it suffices to press on the needle 15 (direction of the arrow) to deform the upper part of the hook so that the spout 4a of its branch 4 is erased from the upward stroke of the claw 9a. We can see in fig. 6 that this deformation is obtained on the one hand of course due to the press and on the other hand by the presence of the bar 13a which bears against the bump 5b, while the lower end of the rod 2 remains stationary relative to to the bottom plate 7.

Starting from fig. 1 the hook can be grasped by the claw 10a of the upper frame 10 being in its low position, since then the spout 5a of the branch 5 of said hook is located above the claw considered (fig. 7). At this position, the hook is also stable since the hump 5b of the branch 5 is in abutment against the bar 13a of the grid 13.

The hook gripped by the claw 10a then rises (fig. 8). During its ascent, its position is stable due to the fact that its branch 4 rubs against the claw 9a of the frame 9, while the rod 2 slides along the blade 14. In the high position the hook is supported by the bump 5b of its branch 5 against the bar 12a of the grid 12.

Illustrated in fig. 9, the position in which the hook remains in its high position by pressing its beak 2a on the blade 14 of open pitch. The particularly large stability of the hook is observed at this high position since its two branches 4 and 5 are guided by the claws 9a and 10a while the boss 5b of its branch 5 rests against the bar 12a of the grid 12.

In fig. 10 shows the hook deformed by the press exerted by the needle 15 in the direction of the arrow. It is in reality only the rod 2 which is interested in the press action. The spout 2a moves away from the blade 14 so that the hook can descend with the frame 10. It should be noted that the deformation of the rod 2 has no influence on the branches 4 and 5 due to the support of the bump 5b of the branch 5 against the bar 12a of the grid 12, of the attachment of the spout 5a to the claw 10a and finally of the guide of the branch 4 by the claw 9a.

During its descent, suspended by the claw 10a, a hook according to the invention is not interested in the rise of the claws 9a of the lower frame 9 because, as illustrated in FIG. 11, in the position of not closed, the bump 4b of the branch cooperates with the rod lla of the racket 11. This causes a deformation of the branch 4 in the direction of the other branch 5 so that the spout 4a of the first cannot be actuated by the claw 9a during the climb. The aforementioned deformation of the branch 4 is made possible by pressing the bump 5b of the branch 5 against the rod llb of the racket 11.

Illustrated in fig. 12 how the hook is deformed by the press of the needle 15 so that it remains in the low position, that is to say that the spout 5a of its branch 5 is not gripped by the claw 10a of the upper frame during the ascent. Here again, the deformation of the branch 5 is possible thanks to the support of its boss 5b against the bar 13a of the grid 13.

The hook illustrated in fig. 13 to 24 is of the same kind as that described above, except that it is intended for reverse press armor mechanics. By this is meant that the hook remains on the bottom board, that is to say in its low position if it is not subjected to a press, while in the normal press the hook is gripped by the claw of the one or the other of the two frames without action of the needle on itself.

The hook illustrated in fig. 13 to 24 is of the same type as the previous one, but its hairpin part has two branches 16 and 17 of shapes different from those 1, 5. The bottom of this part 1 comprises two close rectilinear elements 16a, 17a which then move away to form the parts 16b, 17b whose free ends are arranged in the form of beaks 16c, 17c turned outwards like those 4a, 5a. It is observed that the part 16b of the branch 16 is provided with a camber or bump 16d oriented inwards. A racket with two bars referenced 18 is placed between the arms 16, 17 at their most spaced apart portions 16b, 17b. We have referenced 18a, 18b two superimposed bars of the racket 18.

However, there is a slight change in the location of the open pitch blade and the corresponding hook beak. Indeed said blade now referenced 14 'is located on the right in Figs. 13 to 24 relative to the rod 2 while in the previous figures it was on the left. The spout 2a now referenced 2'a is also inverted with respect to that 2a.

When the hook rests on the bottom board by its ring 6 (fig. 13) the elevation of the lower frame 9 does not cause the hook to rise because the spout 16c is offset to the right with respect to the claw 9a.

If it is desired that the hook rises, it is necessary to press on the needle 15 so as to cause a deformation of the branch 16 which bends so that its beak 16c comes above the claw 9a (fig. 14). The deformation to the right of the hook results in a curvature of its branch 16 owing to the fact that at rest its hump 16d bears against the bar 18b of the racket 18.

There is shown in fig. 15, the hook in its upper position when it is driven by the lower frame 9. It can be seen that the part 17b of the branch 17 is in abutment against the claw 10a of the upper frame during descent because the racket produces a spacing of the parts 16a, 17a of the branches 16, 17. From this position the descent of the hook is possible because the spout 2'a escapes the blade not open 14 '.

Illustrated in fig. 16 the position of the hook and claw frames at the time of their crossing, that is to say when the step is closed. The lower frame 9 descends while the upper frame 10 rises. The part 17b of the branch 17 is guided by the two bars 18a, 18b of the racket 18 due to the deformation of the hook due to the action of the claw 9a on the spout 16c. It should indeed be recalled that when one of the branches of the hook is gripped by a claw it is that it has been previously deformed. Under these conditions, the claw frames are crossed without any action of the rising frame relative to the hooks.

One of these can be kept in the high position provided that its beak 2'a comes to rest on the open pitch blade 14 '. To do this, a press is exerted in the direction of the arrow (fig. 17) by means of the needle 15 so as to deform the rod 2 in the direction of the right. Under these conditions, the hook cannot be lowered and it remains in the position illustrated in fig. 18. This position is stable due to the support of the spout 2'a on the blade 14 ', the action of the bar 18a, and the racket 18 between the parts 16a, 17a of the branches 16, 17 including the extensions upwards 16b, 17b are respectively guided by the claws 9a, 10a.

Fig. 19 shows the hook in the low position as in fig. 13 but with the upper frame allowing the hook to be raised by cooperation of its claw 10a with the spout 17c. As indicated above with reference to similar figures, for the claw 10a to hook the spout 17c it is necessary to bring the latter above it by making a movement (in the direction of the arrow in fig. 20) by the needle 15. The branch 16 of the hook pivots around the bar 18b by cooperation of its hump 16d which allows the displacement of its other branch 17. The top of the latter presses against the claw 10a above which is place the beak 17c. The hook can then be raised by the ascent of the upper frame 10 to arrive at the position of fig. 21 which corresponds to the position of fig. 15 except that it is not the same frame which raised the hook. The latter is stabilized in a similar manner.

The position illustrated in fig. 22 illustrates the crossing of the frames 9 and 10 when the hook descends with its beak 17c associated with the claw 10a. Only the branch 17 of the hook is deformed since it is attached to the claw 10a, the claw 9a rises without hanging the spout 16c.

Fig. 23 illustrates how, thanks to a displacement of the needle 15 or press, the beak 2'a comes to be located above the open pitch blade 14 'so that the hook subjected to the action of the claw 10a of the frame 10 is not lowered by it but remains in the high position, as illustrated in fig. 24. The racket 18 and the guide of the upper parts 16b, 17b of the branches 16, 17 by means of the claws 9a, 10a makes it possible to keep the hook stable in the open step position.

It is possible in fig. 1 to 12 to remove the grids 12 and 13 and to keep only the racket 11 provided that its bars lla, llb are in contact with the parts of the branches 4, 5 of the hook located above the bumps 4b, 5b.

However, it is observed that the needle 15 no longer cooperates with the lower rod 2 of the hook but with its two branches 4, 5 thanks to two eyelets 15b, 15c which each of the abovementioned branches crosses.

As illustrated in fig. 25 the spout 4a of the branch 4 is located above the claw 9a of the lower frame 9 when the hook is in the rest position against the bottom board 7. The elevation of the frame 9 causes that of the hook.

If one does not want the spout 4a to be grasped, one exercises a press the needle 15 (fig. 26) in the direction of the arrow so that the two arms 4, 5 of the hook are moved to the right. The movement of the branch 4 causes the offset of its beak 4a relative to the claw 9a so that when the latter rises it does not grip said beak. The branch 5 is deformed by pivoting around the bar 11b of the racket 11.

At the crossing of the claws (fig. 27) the two branches 4, 5 of the hook are brought together by cooperation of their bosses 4b, 5b with the bars lla, llb of the racket 11 so that the branch 5 of the hook which is not not retained by the claw of a frame is offset with respect to the claw of the other frame, so that the latter cannot raise the hook when it descends attached to the first frame.

Under these conditions, if D is called the spacing of the bars 11a, 11b of the racket, this dimension must be such that the arms are supported on the racket in their parts located above the bumps 4b, 5b so that this racket ensures stabilization while avoiding the tilting of the hook on the bottom board. The distance Dl separating the top of the bumps 4b, 5b is such that the cooperation of the latter with the bars 11a, 11b causes the spouts 4a, 5a to be erased when the claws cross as illustrated in FIG. 27.

Finally, the distance d separating the lower part of the two branches 4, 5 must be such that the branch 5 is in abutment against the racket in the high position of the hook so as to allow the hooking of the spout 2a on the open pitch blade 14. In the illustrated embodiment it is therefore necessary that d is equal to D so that the two lower parts of the arms 4 and 5 cooperate with the two bars of the racket 11 in the high position of the hook.

Claims (4)

1. Mechanism of armor of the Verdol or Jacquard type, the hooks (1-2) of which comprise two equal or unequal branches (4, 5) with ends shaped in opposite beaks (4a, 5a) turned outwards comprising bumps ( 4b, 5b) which come to bear against fixed rods (lla, llb) at the time of the crossing of the claws, characterized in that it further comprises two grids (12-13) whose bars are placed on either side fixed rods (llb) and are arranged on the side of each hook opposite to that which faces the direction of the normal press of the needles (15), while a single rod (2) extends the hook downwards in order to support the open pitch spout (2a). 2. armor mechanism according to claim 1, characterized in that the parts of the two branches (4, 5) of its hooks located above and below the bumps (4b, 5b) cooperate in the low and high position of the hook with the fixed rods (lla, llb). 3. Verdol or Jacquard-type weave mechanics, the hooks (1-2) of which include two equal or unequal branches (16-17) with ends shaped as opposite beaks (16c, 17c) turned outwards, comprising a bump (16d) which comes to bear against a fixed stop at the time of the crossing of the claws, characterized in that the branch (16) of the hook which includes the bump (16d) turned inwards, cooperates with the superimposed bars (18a, 18b ) of the same grid (18) arranged between the two branches (16-17) of the hook. 4. armor mechanism according to claim 3, characterized in that each of the branches (16, 17) of the hook has lower parts (16a, 17a) closer together so as to spread said branches when these lower parts are placed on either side of the bars of the grid (18).

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