JPS5950771B2 - Weft guide member in fluid jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid jet loom that inserts a weft into a warp opening using fluid, and particularly relates to a weft guide member that forms a flight path for guiding the weft during weft insertion. be.

Conventionally, in order to reduce the loss of air injected into the flight path and to prevent the weft from flying out from the flight path, guide members have been used, such as the guide member shown in FIG. 1 described in Japanese Patent Publication No. 53-27394. The body has a bifurcated body into a roughly straight part 3 and an arcuately curved part 4, and the outer free end 5 of the straight part 3 and the outer free end of the curved part 4 form a weft escape opening between the wefts. The straight part 3 and the curved part 4 jointly form a substantially circular weft flight path 9 below the weft escape opening 6, and the curved part has a weft thread in the curved part. It is known that a leaf spring 7 is provided in front of the escape opening 6, the outer end of which rests against the inner wall of the straight part 3.

In such a conventional guide member, the weft escape opening 6 of the weft flight path 9 is completely closed except when the leaf spring 7 is deformed due to escape of the weft 12, thereby reducing air loss and preventing the weft from flying out. You can achieve your intended purpose.

However, in order to reliably pass the weft yarn through the weft flight path formed by a large number of such guide members, air fluid at a considerably high speed must be used. Vibrations may occur due to the strong influence of the high-speed fluid flowing inside, and turbulence may occur in the fluid flow.

The occurrence of turbulence brings about unexpected situations such as the weft thread waving in the weft insertion direction or the tip of the weft thread getting caught in a guide member near where the turbulent flow occurs.

Also, in order to prevent the vibration of the leaf spring, it is possible to reduce its length, but in that case, the spring constant of the leaf spring will increase, so that the length of the leaf spring can be reduced just before beating after the weft has passed through the flight path. When the weft yarn escapes, the leaf spring creates a large resistance, which is undesirable.

Therefore, an object of the present invention is to provide fluid jetting that does not cause vibrations in the leaf spring, and also allows the length of the leaf spring to be extended to a suitable length as desired without causing resistance when the weft escapes. An object of the present invention is to provide a weft guide member for a type loom.

According to the invention, the generally straight section, or the curved section which together with the straight section forms the body of the weft thread guide member, has a relatively rigid section facing the weft escape opening and the weft flight path. A strong weft guiding piece is provided, the spring-like piece being located on the outside of said weft guiding piece with respect to the weft thread flight path.

Therefore, even if a high-speed airflow passes through the weft flight path, the relatively rigid guiding piece acts as a protective wall, so the influence of the high-speed airflow does not extend to the spring-like pieces, and turbulence is not caused. I can't do it.

Moreover, since it is possible to adopt a spring-like piece bent into any shape as desired, a spring-like piece formed within a short distance between the free end of a straight part and the free end of a curved part can be used. The length of the strip is substantially increased, and less force is required to deform the spring-like strip during withdrawal of the weft yarn.

Next, embodiments of the invention will be described with reference to the accompanying drawings.

FIG. 1 shows a conventional guide member 1, the main body of which usually includes a handle 2 and whose upper part is bifurcated into a straight section 3 and an arcuately curved section 4.

The handle 2 is fixed to a sled (not shown) in a conventional manner.

The upper part of the straight part 3 becomes a tip 5 and protrudes, while
The upper part of the curved part 4 is provided with a leaf spring 7 which forms a weft exit opening 6 and is in full contact with the longitudinally straight and laterally inclined inner edge 8 of the straight part 3.

Therefore, the weft thread running path 9 has a generally circular cross section, and the leaf spring 7 directly faces this weft thread running path 9, so that the leaf spring 7
is affected by high-speed airflow passing through the weft flight path 9 in the direction of the arrow.

FIG. 2 shows that when the warp opening is closing and the guide member 1 begins to move away from the warp opening due to the rotation of the sley, the leaf spring 7 is deformed in the direction of the weft exit opening 6 due to the relative movement of the guide member 1 with respect to the weft 12. The guide member 1 and the upper and lower warp thread groups 10, 11 are shown at the moment when the weft threads 12 leave the flight path 9.

FIGS. 3 and 4 show the guide member 1' according to the present invention in a state corresponding to FIGS. 1 and 2, and the middle or corresponding portions in the figures are given the same reference numerals.

In FIG. 3, the free end of the arcuately curved portion 4 extends toward the free end or tip 5 of the straight portion 3, and on the inside facing the weft flight path 9, the base is formed to be thick as shown in the figure. A weft guiding piece 13 having a relatively strong stiffness is provided with an opening 6 for the weft 12 to escape between it and the straight inner edge 8 of the straight portion 3.

Further, a spring-like piece 7' which normally closes the opening 6 is provided on the outside of the guide piece 13 with respect to the weft thread flight path 9 so as to correspond to the linear inner edge 8.

In the illustrated embodiment, the spring piece 7' is bent in a zigzag manner, but it may be substantially straight like the conventional spring piece 7 shown in FIG. , J.
shape and W shape, such that the substantial length of the straightened spring piece 7' is longer than the short distance between the free end of the curved part 4 and the free end of the straight part 3. Any shape is possible.

By bending the spring piece 7' in this manner, a spring piece with a small spring constant can be installed within a short distance.

When the guide member 1r is in the position shown in FIG. 3, a high-speed air flow passes through the weft thread flying path 9, and the weft thread 12 is inserted.

Since the guide piece 13 is present facing the weft flight path 9, it protects the spring piece 7' from the influence of high-speed airflow, so whether the spring piece In is straight or bent, the spring piece 7' No vibration occurs in the piece 7'.

As shown in FIG. 4, when the guide member 1' leaves the warp opening due to the rotation of the sley (not shown), the weft 1
2, the weft yarn 12 passes through the escape opening 6 and deforms the tip of the spring-like piece r in a direction away from the straight inner edge 8.

Due to the presence of the guiding piece 13, it is possible to employ a spring-like piece 7' with a smaller spring constant than the conventional one, so the force required to deform the spring-like piece 7' is reduced, and the escape of the weft yarn 12 is hardly prevented. There will be no resistance.

FIG. 5 shows a third modification of the guide member according to the present invention.
FIG.

In this modification, the guide piece 13 and the spring-like piece 7' are integrally molded at the tip of the generally straight part 3 of the main body.
This embodiment is substantially the same as the embodiment shown in FIG. 3, and provides the same effects.

As described above, according to the present invention, the guiding piece is provided directly facing the weft flight path, and the spring-like piece is provided on the outside of the guiding piece.
A guide member is provided in which vibration does not occur in the spring-like piece, and the length of the spring-like piece can be extended as desired to a suitable length that does not create resistance when the weft escapes.

Note that the tips of the spring-like pieces do not necessarily have to be in contact with the opposing portions, but may just be very close to each other.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional guide member during weft insertion, Fig. 2 is a front view of the guide member shown in Fig. 1 just before reed beating, and Figs. Figure and second
FIG. 5 is a diagram corresponding to FIG. 3 of a modified example of the guide member according to the present invention. 1'... Guide member, 3... Roughly straight part, 4... Curved part, 6... Weft escape opening, 7'...・Spring piece, 9...
Weft thread flight path, 12... Weft thread, 13...
Weft guiding piece. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. The main body is bifurcated into a generally straight part and an arcuately curved part, and the free end of the straight part and the free end of the curved part have a weft escape opening between them. In a fluid jet loom, the straight portion and the curved portion jointly form a generally circular weft flight path for guiding the set yarn below the weft escape opening. In the weft guide member, the curved portion or the straight portion includes a relatively rigid weft guide piece located facing the weft escape opening and the weft flight path, and a weft guide piece located outside of the weft guide piece in the vicinity of the weft guide piece. A weft guide member for a fluid jet loom, characterized in that the weft guide member is provided with a spring-like piece whose tip abuts or comes very close to the straight portion or the curved portion. 2. The fluid injection type according to claim 1, wherein the spring-like piece is bent so as to be longer than the distance between the free end of the straight portion and the free end of the curved portion. A weft guide member in a loom.