EP0932713A1

EP0932713A1 - Device for protecting the connection of a jacquard heddle with its control and/or return means

Info

Publication number: EP0932713A1
Application number: EP98906969A
Authority: EP
Inventors: Jean-Jacques Tardy
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-02-05
Filing date: 1998-02-04
Publication date: 1999-08-04
Anticipated expiration: 2018-02-04
Also published as: FR2759095A1; DE69802660T2; WO1998035080A1; DE69802660D1; FR2759095B1; EP0932713B1

Abstract

The invention concerns a device comprising on each heddle (2) in the proximity of its mail (2b) or of its warp eye for fixing a neck twine, a joining piece (10), made of synthetic material, mounted sliding on the heddle (2) and comprising, opposite the mail or equivalent, an end part (14) having no salient angle with its transverse cross-section decreasing away from said mail, and in the proximity of this mail, a cylindrical bearing surface (13) for the attachment, by radial clamping, of a tubular element (15) with an internal diameter substantially equal to that of said mail and a length greater than that of the linking zone, such that, when the joining piece is brought against the mail, it encloses said mail and moves beyond it. The tubular element (15) can be made of a heat shrinkable synthetic material, capable of shrinking after it has been positioned, or it can consist of a helical spring.

Description

DEVICE FOR PROTECTING THE CONNECTION OF A JACQUARD SMOOTH WITH ITS CONTROL AND / OR RECALL MEANS

The object of the present invention is to provide a protection device which overcomes these drawbacks and which is compact, easy to implement, inexpensive, while preventing vertical snagging between neighboring rails.

To this end, the device according to the invention comprises on each stringer and near its eyelet or its loop for hanging a cord, an end piece which, made of synthetic material, is slidably mounted on the stringer and comprises , opposite the eyelet or equivalent, an extreme part without sharp angle and whose cross section decreases as it moves away from this eyelet, and, near this eyelet, a cylindrical bearing for the attachment by radial tightening of a tubular body having an internal diameter substantially equal to that of this eyelet and a length greater than that of the connection zone, so that when this end piece is brought against the eyelet, grip this eyelet and go beyond him.

Thus, each stringer is previously provided with the plastic end piece, slidably mounted on it and equipped with the tubular body. When mounting the heddle, the end piece is moved away from the eyelet, to promote knotting or jamming of the cord, then is brought back against this eyelet so that its tubular body envelops the latter and the knotted or hooked ends of the arcade cord. In one embodiment of the invention, the tubular body is made of heat-shrinkable synthetic material and is fitted onto the cylindrical surface of 1 • end piece.

This arrangement allows, at a low cost, to secure the tubular body with the end piece and then, after it has been brought around the connection zone and by heat shrink, to retract it on this area to reduce the overall size of the protection.

The second system consists in wrapping the connection zone of the arch cord with the eyelet or the loop by a part of overmolded synthetic material. This solution is expensive and forms a protrusion around the point of connection which, in the case of a high density of heddles and of operation at high speed, favors, when in contact with neighboring growths, transverse rebounds harmful to the quality weaving.

The third system, the most commonly used, consists of covering the connection area of the heddle with a tube of heat-shrinkable plastic having a length of the order of 30 mm. This tube is first introduced under the rail to come below the eyelet or the loop then, after knotting or wedging the end of the arch bead, is reassembled to wrap the connection area, then is heated to heat shrink around this area. This technique, which ensures the protection of the connection zone, while possibly participating in the connection, within the framework of wedging the cord, has the advantage of very slightly increasing the transverse dimension of this connection zone and this because the small thickness of the tube. On the other hand, it has the drawback of forming at each end of this zone, wedge parts comprising sharp angles, corresponding to the retracted ends of the tube. During the movements of the heddles, these parts can, when going up or down, hook the lower end or the upper end of the connection zone of a neighboring heald and cause defects in the weaving. To remedy this, it is possible to use even thinner sections of tube, but this increases the fragility of the protection and multiplies its price in proportions such that it is not possible to use it.

The invention relates to a device for protecting the connection of the heddles of Jacquard looms, that is to say equipped with a Jacquard mechanism, with the arcade cords, also applicable to the lower ends of the heddles mentioned by elastic threads.

In the Jacquard looms, and as shown diagrammatically in the appended FIG. 1, each stringer 2 is provided with an eyelet 3 crossed by the warp thread 4 whose vertical position must be checked. It is linked, by its lower end 2a, to return means constituted, according to the embodiments, by a spring 5 or by an elastic wire, fixed by its end to the frame. Its upper end 2b is provided with an eyelet or equivalent allowing it to be hooked to an arch cord controlled by the Jacquard 8 mechanism. Each stringer is generally supplied by being linked to its return means and it is placed on the loom by hooking the lower end of its means on a fixed part of the frame and by hooking its eyelet 2b to the end of one of the yoke cords 6.

Various techniques are used to ensure this connection and in the particular case of high densities, that is to say when the number of heddles per cm ² is very large, three systems are usually implemented.

The first system uses a plastic tube which, having a length greater than that of the crowd, is arranged around the heddle, then, after knotting or wedging the end of the cord in the loop or the eyelet of the smooth, is reassembled on the loop of the eyelet beyond the end of this element. Such a tube has the disadvantage of having a minimum outside diameter which is too large and which cannot be used at high densities.

In another embodiment, the tubular body is constituted by a section of helical spring, the lower end of which is fitted onto the cylindrical attachment surface of the end piece. This spring, which can be cylindrical, frustoconical, or ogival, contributes to the connection while forming a protection of the latter.

Whatever its embodiment, this device forms a whole, conical and without sharp angles at least on one side. When this assembly comes into contact with the projecting ends of the neighboring rails, it moves away radially and gradually the connecting zones of the neighboring rails, without generating rebounds and without the risk of catching.

Other characteristics and advantages will emerge from the description which follows with reference to the attached schematic drawing.

Figure 1 is a schematic view of a heald assembly with a Jacquard mechanism,

FIGS. 2, 3 and 4 are views in longitudinal section of a stringer fitted according to the invention, respectively, before hanging the cord, after hanging or knotting and after retraction of the tubular body,

Figure 5 is a side view in cross section similar to Figure 4 but showing another embodiment of the device according to the invention.

In the embodiment shown in FIGS. 2 to 4, and concerning the attachment of the upper eyelet 2b of a heald to the yoke 6, the heald 2 is equipped with an end piece 10 made of synthetic material. This tip has, going from top to bottom, that is to say going opposite the eyelet 2b, a cylindrical surface 13, a shoulder 12 and an end 14. The latter has a cross section which , decreasing in moving away from the eyelet 2b, gives it a frustoconical or ogival shape, without sharp angles.

This end piece can be molded out of the heddle and then threaded onto it before its eyelet or its loop 2b is formed, but it can also be molded directly onto the heddle 2, when the synthetic material the component exhibits the ability not to adhere to the metal constituting the heald 6, so that this end piece is free in translation on this heald. One of the ends of a tubular body 15 is fitted onto the cylindrical surface 13 of the endpiece 10. The engagement of this body is limited by abutment on the shoulder 12.

In the embodiment shown in Figures 2 to 4, this tubular body 15 is constituted by a section of sheath of heat-shrinkable synthetic material.

When the heald is supplied, it is therefore integral with the end piece 10 equipped with the section 15 as shown in FIG. 2. To proceed with its mounting, the end piece 10 is moved opposite the eyelet 2b to release this eyelet and facilitate the attachment or knotting of the yoke cord 6 on it. When this operation is completed, the entire device is reassembled so that, as shown in FIG. 3, the tube 15 envelops the eyelet 2b and the end of the yoke cord 6 and extends beyond these elements. It is then proceeded to the localized heating of the tube 15 so that the latter retracts by marrying the eyelet and the arch cord, and taking the shape shown in FIG. 4. Under these conditions, the connection zone has , in the lower part, a pronounced ogival shape without a sharp angle or edge and, in the upper part, a shape whose cross section generally decreases upwards.

Thus, when the heddle descends under the action of its return means, after having been displaced upwards by the yoke 6 to open the shed, its end piece 10 forms a spreader by pushing radially back to outside the upper ends of the connecting zones of the juxtaposed beams, which normally would come into contact with it by the sharp angles of the retracted tubes. In other words, the shape of the tip prevents any snagging.

The embodiment shown in Figure 5 differs from the previous one in that the tubular body 15 of synthetic material is replaced by a helical spring 16 whose lower end is fitted with radial clamping on the cylindrical seat 13 of the 'end piece 10. The spring shown is of frustoconical type, but it can also be cylindrical, provided that the maximum dimension of the end piece 10 is greater than its outside diameter. This spring may include contiguous or spaced turns. The end of its turn furthest from the endpiece 10 is returned to the inside, for example by bending, so as not to form a sharp angle which can catch the other end pieces.

Advantageously, the largest outside diameter of the end piece 10, measured at the shoulder 12, is greater than the diameter of the tube 15 or of the spring 16, and this to avoid any catching with the juxtaposed end pieces.

As for the internal diameter of the tube 15 or of the spring 16, it has a value substantially equal, apart from the functional clearance, to that of the transverse size of the eyelet 2b or of the loop. The length of the tube 15 or of the spring 16 is of the order of 30 mm, so as, as shown in FIGS. 3 to 5, to extend beyond the connection zone between the yoke 6 and the eyelet 2b or equivalent.

The connection and protection device which has been described in the context of its application to the attachment of the upper end of a heddle to a yoke, can also be used for the attachment of the lower end from smooth to elastic reminder cord.

It appears from the above that the device according to the invention is simple to implement, inexpensive, compactly transversely and contributes to avoiding any hooking between beams.

Claims

CLAIMS 1 / Device for protecting the connection of a Jacquard boom with its control and / or return means, characterized in that it comprises on each boom (2) and close to its eyelet (2b) or its loop for the attachment of a yoke cord (6), a nozzle (10) which, made of synthetic material, is slidably mounted on the rail (2) and comprises, opposite the eyelet or equivalent, an end portion (14) without sharp angles and whose cross section decreases as it moves away from this eyelet, and, near this eyelet, a cylindrical seat (13) for the attachment by radial tightening of a body tubular (15 or 16) having an internal diameter substantially equal to that of this eyelet and a length greater than that of the connection zone, so that when this end piece is brought against the eyelet, enclose this eyelet and go to the beyond him.

2 / Device according to claim 1 characterized in that the end piece (10) is molded independently of the rail (2) and is threaded thereon before formation of the eyelet (2b) or the loop.

3 / Device according to claim 1 characterized in that the end piece (10) is molded onto the rail (2) of steel. 4 / Device according to claim 1 characterized in that the maximum transverse dimension of the end part (14) of the nozzle (10) has a transverse value greater than that of the transverse dimension of the tubular body (15). 5 / Device according to claim 1 characterized in that the tubular body (15) is made of heat-shrinkable synthetic material.

6 / Device according to claim 1 characterized in that the tubular body is constituted by a section of helical spring (16) whose lower end is fitted on the cylindrical surface (13) of the nozzle.