JPS6231101B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft guide member for a jet loom, and its purpose is to prevent turbulence of air flowing in an air passage during weft insertion, and to reduce leakage of this air to the outside. To provide a weft thread guide member of a jet loom which enables a stable weft insertion operation and facilitates escape of weft threads during beating.

In the conventional weft guide member, as shown in FIG. 11, since a thin flexible tongue piece 20 is located in the air passage 6, this tongue piece 2 is influenced by the flowing air flow.
0 vibrates, disturbing the air flow, and causing the weft thread to come into contact with or get caught on the tongue piece 20, causing weft insertion errors.

The present invention aims to eliminate the above-mentioned drawbacks of the conventional weft while maintaining the effect of the tongue piece which is useful for preventing the weft from jumping out from the slit 7.

Hereinafter, the first embodiment embodying the present invention will be described as 1st and 2nd embodiments.
To explain the figure, 1 is a tunnel type weft guide member installed in the jet room,
The arm portion 2 that extends straight upward is branched into an arcuate guide portion 4 and a vertical guide portion 5 above the arm portion 2 . Reference numeral 6 denotes an air passage surrounded by both guide parts 4 and 5, and the inner wall thereof has a tapered shape that converges toward the weft flight side.

Reference numeral 7 denotes a weft release slit provided between the ends of both guide parts 4 and 5, which includes a wall surface 8 formed on the side of the arc-shaped guide part 4 and having a front circular arc shape, and a vertical guide extending along the wall surface 8. It is formed between a thin plate-like tongue piece 9 as a flexible part formed on the side of the part 5. The width w of the slit 7 is formed so that it gradually becomes narrower on the distal end side of the tongue piece 9 than on the proximal end side.
get very close to. As shown in FIG. 2, the tip of the tongue piece 9 is made smaller than the thickness of the arcuate guide portion 4, so that the weft yarn is not caught on the tongue piece 9.

Most of the flexible portion of the tongue piece 9 is connected to the air passage 6.
It is located outside of the area, not facing it.

When weft insertion is performed using the weft guide member as described above, the air flow flowing through the air passage 6 of the guide member 1 is formed with a narrow slit width w in the range of 0.6 to 0.1 mm. 7, it has become difficult to leak to the outside.

If the leakage airflow can be reduced, weft threads can be prevented from escaping from the slit 7 during weft insertion, and weft insertion can be carried out stably.

Since the tongue pieces 9 forming the slit 7 have outward flexibility, during beating, the weft can easily escape outward from the slit 7 while remaining linearly extended. It will not get caught or bent at the slit 7 part.

Further, in the guide portion 1, the tongue piece 9 connects to the air passage 6.
Since the tongue piece 9 does not face the air passage 6, the tongue piece 9 does not vibrate due to the air flow within the air passage 6. If the vibrations are eliminated, there will be no turbulence in the air flow within the air passage 6, and the weft insertion operation can be made more stable.

In this regard, in the conventional device shown in FIG. 11, the tongue piece 20 projects obliquely from a part of the annular portion, which is inconvenient.

In addition, in order to prevent the above-mentioned disturbance of the air flow, it is possible to provide rigidity to the tongue piece 9;
If this is done, it becomes difficult for the weft yarn to slip out of the slit 7 during beating, and for this reason it becomes necessary to widen the width w of the slit 7. However, if the width w of the slit 7 is increased, the air passage 6
This results in an inconvenience in that the leakage airflow from the airflow increases.

As shown in FIG. 3, a plurality of notches 10 may be formed at the tip of the tongue piece 9 as a flexible portion in the guide portion 1 of the embodiment described above, extending in the weft withdrawal direction. In this way, the flexibility of the tongue piece 9 can be further promoted, and for this reason, the tongue piece 9 can be formed slightly thicker to facilitate its molding.

In addition, in order to facilitate the molding of the tongue piece 9, the tongue piece 9 is formed short as shown in FIG. It may also be glued or molded. Since these fluffs, threads 11, etc. are highly flexible, there is no need to strictly set the width w of the slit 7 when molding the guide member 1.

As shown in FIG. 5, an extremely weak leaf spring 12 may be used instead of the fluff, thread 11, or the like.

Next, a second embodiment of the present invention will be described with reference to FIG. 6. The guide member 1 of this embodiment has a tongue piece 9 formed at the tip on the arcuate guide part 4 side, and the inner wall surface of the vertical guide part 5 A slit 7 is formed between the slit 7 and the slit 8. In this case, the tip of the tongue piece 9 is made smaller than the thickness of the vertical guide portion 5, so that the warp threads are not caught on the tongue piece 9.

FIG. 7 shows an embodiment in which tongues 9 are formed on both the arcuate guide portion 4 and the vertical guide portion 5. In this case, since both tongue pieces 9 are bent, the weft thread can be pulled out even more easily. Since both tongue pieces 9, 9 can be bent in areas that do not face the air passage 6, they will not vibrate due to the influence of air flow.

Finally, a third embodiment of the present invention will be explained with reference to FIGS. 8 to 10. The guide member 1 of this embodiment maintains the normal guide shape and has one or both of the arcuate guide portion 4 and the vertical guide portion 5. A portion of the width near the tip is extremely narrowed, and a flexible portion 14 is formed between the narrow portion 13 and the tip. This flexible part 1
4 is formed by simultaneously molding the narrow portion 13 when molding the guide member 1, or by molding the narrow portion 13 at the same time as the guide member 1.
After normally molding, a part of one or both of the guide parts 4, 5 near the tips is notched from the outside to form a concave part 15, thereby forming the narrow part 13. If the narrow portion 13 is cut out after the guide member 1 is normally molded in this manner, the flexible portion can be easily formed.

In such a guide member 1, the flexible portion 1
4 also forms the part where the air passage 6 is formed, but the air flow flows within the air passage 6, and the narrow part 13 is formed in the thick part near the air passage 6, which is quite deep from the thin outer periphery of the guide part. Furthermore, the tip of the flexible portion 14, which is prone to large runout, is provided with a slit 7 where the air flow for weft flight is small.
Since the flexible portion 14 extends to the weft, it is difficult to vibrate, and vibrations have little effect on the flying weft. During beating, the flexible portion 14 is pushed by the weft and bent around its narrow portion 13.

A leaf spring 17 may be inserted into this narrow portion 13 as shown in FIGS. 8 and 9, and a flexible portion 14 and an arcuate guide portion 4 are inserted into the recessed portion 15 outside the narrow portion 13 as shown in FIG. A compression spring 16 may be provided between them. Further, the leaf spring 17 may be attached to the inside of the recess 15 as shown in FIG. 10 instead of being inserted.

As described in detail above, the present invention forms an arcuate guide part and a vertical guide part with an air passage inside at the upper end of the arm part, and also provides a flexible part at the tip of the arcuate guide part and/or the vertical guide part. By forming a slit for weft escape between this flexible part and another flexible part or guide part facing it, a flexible part such as a tongue piece is not located in the air passage. This prevents turbulent flow of air flowing through the air passage during weft insertion, reduces the leakage of this air to the outside, and allows stable weft insertion. This invention is excellent for industrial use as a weft guide member for a jet loom because it has the effect of making it easier for the weft to escape.

[Brief explanation of the drawing]

Fig. 1 is a front view of the weft guide member of the first embodiment embodying the present invention, Fig. 2 is a partially enlarged side view thereof, and Figs. 3, 4, and 5 are partially enlarged front views showing other examples thereof. 6 is a front view of a weft guide member according to a second embodiment of the present invention, FIG. 7 is a partially enlarged front view showing another example thereof, and FIGS. 8 and 9 are a front view of a weft guide member according to a second embodiment of the present invention. The partially broken front view shown in FIG. 10 is also a partially cutaway front view.
FIG. 11 is a front view showing a conventional guide member using a flexible portion. Weft guide member...1, arm part...2, arcuate guide part...4, vertical guide part...5, air passage...6, slit...7, tongue piece (flexible part)...
9.

Claims (1)

[Claims] 1. An arcuate guide portion and a vertical guide portion each having an air passage inside are formed at the upper end of the arm portion, and a flexible portion is provided at the tip of the arcuate guide portion and/or the vertical guide portion. A weft guide member for a jet loom, characterized in that a slit for weft escape is formed between a flexible part and another flexible part or a guide part opposing the flexible part. 2. A weft guide member for a jet loom according to claim 1, wherein the flexible portion is an elongated tongue integrally formed with an arcuate guide portion or a vertical guide portion. 3. A weft guide member for a jet loom according to claim 2, characterized in that a number of notches extending in the weft exit direction are formed at the tip of the tongue piece. 4. A jet loom weft guide member according to claim 2, characterized in that the width of the slit is formed to be gradually and continuously narrower on the distal end side of the tongue piece than on the proximal end side. 5 In claim 1, the flexible portion is a fluff provided at the tip of an arcuate guide portion or a vertical guide portion;
A weft guide member for a jet loom, characterized in that it is a thread or a leaf spring. 6. The weft guide member for a jet loom according to claim 1, wherein the flexible portion is a pair of tongue pieces formed on both the arcuate guide portion and the vertical guide portion so as to face each other.