GB2109829A - Travelling wave shed weaving loom - Google Patents

Abstract

In a travelling wave shed weaving loom a chain (3) arranged below the rotary beating up blades (13) is provided with shuttle picking jib arms (17) which pass between the waves of the blades 13 and between the blades 13 and the dents of a separating reed (10). The dents of the reed (10) fit closely to the circumference of the blades (13), at least between the plane of the lower warp threads (23) of the shed and the weaving plane, the blades (13) are supported by rotating rollers (11) and the jib arms (17) are provided with rollers 18 which drive the shuttles (20). <IMAGE>

Description

SPECIFICATION Travelling wave shed weaving machine The present invention relates to a travelling wave shed weaving machine. A travelling wave shed weaving machine includes a device for forming the fabric. The device comprises a rotary reed, a separating grate and weft inserters which are displaced inside the shed formed of warp threads by means of a rotary chain.

At present, travelling wave shed weaving machines are known in various embodiments.

Several embodiments are known, in which a sufficiently large gap is formed between the rotary reed and the separating grate, inside which the weft inserters are moved. With rotary reed gliders, in which the beat-up edge is submerged below the warp and emerges therefrom, the warp threads run over from one rotary reed gap to another, due to insufficient guiding between the gliders of the rotary reed and the lifters of the separating grate thus causing weaving faults. The rotary reeed has a relatively narrow laying gap, into which the wext extending from the inserter is laid so as to be beaten up by the reed to be binding point. It happens frequently, that the weft is not laid into the laying gap, is not transferred to the binding point, and the fabric is woven-in immediately behind the inserter. Thus, a fault is caused which can be removed only after interrupting the weaving process.A further embodiment is known, in which the rotary reed is situated in the immediate proximity of the separating grate. The inserter is directed from the rotary chain to the rotary reed, of which the gliders are provided with special helically arranged teeth, by means of which the inserter is advanced inside the shed. The weft inserter bears partially against the rotary reed, and partially against a guiding channel made directly in the gliders of the separating grate. Due to this channel, a considerable gap is formed again between the rotary reed and the separating grate, exactly at the point of the weaving plane, this gap making it possible for the warp threads to run over at the moment at which the beat-up edge of the rotary reed penetrates them.In consequence of the considerable forces, which are frequently necessary for drawing the inserter through the warp, wear and reduction of lifetime of the device are caused on the rotary reed as well as on the inserter. The rotary reed can be easily distorted by the weaving pressure, due to its slenderness and low rigidity. This causes a small deflection of the inserter and increases its resistance upon passing through the guiding channel of the separating grate. For that reason, the rotary reed is supported by massive, driven supporting beams. Finally, it is necessary to apply a special device which transfers the inserter from the rotary chain to the rotary reed at the inlet, and from the rotary reed back to the rotary chain at the outlet.

The disadvantages mentioned above are mitigated by the weaving machine according to the present invention, of which the subject matter consists in that the rotary chain is arranged below the rotary reed, the links of said chain being provided with jib arms passing between the helix waves of the rotary reed and the lifters of the separating grate. The jib arms are in driving engagement with the weft inserters. The lifters of the separating grate abut against the outline of the rotary reed, at least between the plane of the lower warp threads of the shed and the weaving plane.

In consequence of guiding the warp threads throughout the whole weaving plane overrunning is prevented and the accuracy of weaving thus increased. Upon contouring of the separating grate lifters with the rotary reed, the guiding of the inserters by the jib arms is reliable and accurate, and no increased stress of the rotary reed is caused. The wear of the inserters is reduced.

One embodiment by way of example of a weaving machine according to the present invention will now be described with reference to the accompanying drawings, in which: Fig. 1 is a cross-section of a fabric forming device according to the invention with the shed open, Fig. 2 is a side view of the device of Fig. 1 Fig. 3 is a plan view of Fig. 2, Fig. 4 is a cross-section of the device of Fig. 1 with the shed closed and Fig. 5 is a plan view of the mutual position of rotary reed gliders of the device of Fig. 1 and separating grate lifters.

On frame 1 of the weaving machine, guide 2 is fixed for guiding a rotating chain, having connecting pins 3, on which are swingably mounted links 4. Each connecting pin 3 is provided at each end with a chain pulley 5, by means of which the chain is guided along guide 1.

To prevent the chain from falling-out of the guide, it is supported at the middle part of pins 3 by supporting rollers 6, which are rotatably mounted by means of fastening pins 7 in holder 8, from the other side of the chain relative the guide 2. The holder 8 is fixed in the machine frame 1 and is provided in its upper part by a stationarily mounted separating grate, which consists of a frame 9, in which are stationarily inserted lifters 10. Between the frame 9 of the separating grate and the supporting rollers 5, holder 8 is provided with a recess in which supporting rollers 11 are rotatably mounted. Guide 2 is also provided with a recess with further rotatable supporting rollers 11, at the same level as holder 8.The rotary reed, which consists of a shaft 12, on which gliders 13 are mounted in form of a segment comprising a beat-up edge 14 with an apex 15 (see Fig. 4), bears with its lower part against the supporting rollers. The gliders 13 are mounted on shaft 12 in such manner, that the beat-up edges 14 constitute a helical surface. The lifters 10 of the separating grate are arranged parallelly at the same spacing as gliders 1 3 of the rotary reed, and are longitudinally misaligned. The lifters 10 of the separating grate are cambered, at the side of the rotary reed, along an arcuate surface 16, which conforms with the outline of the rotary reed, to which the lifters 10 are closely fitted with their camber. Jib arms 1 7 are fixed at their lower ends to the links 4 of the rotary chain.The jib arms 17 pass between the waves of the rotary reed helix, which are constituted by gliders 13 and lifters 10 of the separating grate, and the arms are provided at their upper end with driving rollers 18, which are engaged with driven rollers 1 9 mounted rotatably on the inserters 20 (see Fig. 2) for weft thread 21 shown in Fig. 3. The inserters 20 are carried by the jib arms 1 7 and are displaced by them through the open shed 22, defined by upper and lower warp threads 23, which are controlled by means of healds 24 mounted in sections in columns 25. The inserters 20 are held in position from above by a swingable retaining bar 26. At the peak of shed 22, temples 28 are laid on the formed fabric 27.

Upon starting the weaving machine, the rotating chain is driven by means of a not represented chain wheel. Simultaneously, the rotary reed is rotated synchronously. The jib arms 1 7 are entrained by links 4 of the rotary chain and drive the inserters 20 with the help of driving rollers 18 8 and driven rollers 1 9. Waves formed by beat-up edges 14 of gliders 13 are advanced by the rotary motion of the rotary reed, and the jib arms 1 7 with inserters 20 are advanced continuously therewith.The wave shed 22 is successively opened in front of them and closed behind them, while the weft thread, inserted by the inserter 20 is beaten-up to the binding point by the following wave of the beat-up edges 14 of gliders 13 and is bound by the warp threads 23 in the course of forming a further shed 22 for the following inserter 20. The pair of warp threads 23 meet the apex 15 of the beat-up edge 14 of glider 13 at the moment, at which the coiumns 25 of the upper and lower warp threads are in alignment. Thus, the opening of shed 22 is zero.

The warp threads 23 are dislocated at close proximity of the lifters 10 of the separating grate, and thus their accurate guiding is secured, and their overrunning to the wrong glider 1 3 of the rotary reed is prevented. In order to prevent the rotary reed from sagging, it is supported from below by supporting rollers 11 rotating therewith.

The inserters are guided, upon securing the engagement of the driving roller 18 and the driven roller 19, by the retaining bar 26 which can be swung out, when any intervention into the warp becomes necessary.

Claims (3)

Claims

1. A travelling wave shed weaving machine, comprising weft inserters, which are displaceable in the weaving plane through the shed formed of warp threads, the inserters being driven by a rotatably linked chain, and a rotary reed in form of a helix, the reed having gliders for beating-up of the weft, and an adjacent separating grate, wherein the rotatable chain is arranged below the rotary reed, and its links are provided with jib arms extending between the waves of the rotary reed helix and lifters of the separating grate, and are in driving engagement with the weft thread inserters.

2. A weaving machine as claimed in Claim 1 wherein the lifters of the separating grate fit closely to the outline of the rotary reed, at least between the plane of the lower warp threads of shed and the weaving plane.

3. A travelling wave shed weaving machine substantially as described with reference to the accompanying drawings.