JPS5841937A - Guide element of air jet type loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft insertion device for an air-injection loom in which guides each having a weft guide hole and a weft escape gap connected thereto are arranged in the weft insertion direction, and particularly relates to improvements in the guide. It is something.

As a conventional weft insertion device for air-injection looms, so-called closed-type guides having a weft guide hole and a continuous weft escape gap are arranged in the weft insertion direction, and a guide path is formed by a row of guide holes. There is one in which a weft yarn is inserted by forming a weft yarn conveying airflow in this guide passage. In this case, the main nozzle method uses a weft injection nozzle (main nozzle) to generate a weft transport airflow, and auxiliary nozzles are arranged at a predetermined interval on one side of the guide passage, and air is ejected diagonally from the auxiliary nozzles into the guide passage. However, there is an auxiliary nozzle method in which the weft ejected from the main nozzle is transported by a weft transporting airflow generated by an auxiliary nozzle, or a combined method in which the main nozzle and auxiliary nozzle are used together to generate a weft transporting airflow.

By the way, in recent years, weft inserters using this type of closed-type guide have been designed to reduce air consumption.
Attempts have been made to improve the weft conveyance efficiency (transporting the weft effectively with the amount of evening air), and one attempt has been made to reduce the diameter of the guide hole, especially in the aforementioned auxiliary nozzle system. Attempts have been made to reduce the diameter of the hole to around 7-φ, and some success has been achieved. Therefore, such a reduction in the size of the guide hole means that the weft yarn may actually turn or meander.
Since the weft threads fly while causing dimensional runout, the weft threads fly using the guide hole to the fullest, and the weft threads are greatly influenced by the wall surface of the guide hole.

However, as shown in FIGS. 1 and 2, the conventional guide 1.
11 is a weft escape gap 1j3 connected to the guide hole 2.12.
, 13, and in order to facilitate the escape of the weft from the weft escape gaps 3 and 13 during the beating process, guide hole inner walls 2a and 2b connected to the weft escape gaps 3 and 13,
Since the angle '1 eθ2 between j7m and 12b was quite acute, the weft yarn was affected by the swirling flow S1+82 caused by air ejected from the auxiliary nozzle 5.15, and the inner wall of the guide hole 2.

2b, 12 &, 12b, due to the directionality of the movement imparted to the weft, for example, the air and weft in the arrow '1sb1 direction are dispersed into movements in the weft escape 111't+bs direction and the arrow &2+b2 direction. , 12°b2
As the direction becomes larger, air or the weft enters the weft escape gap 611t3, 13, and there is a high probability that it will fly out from the nucleus gap @3, 13 and cause a weft insertion failure.

Furthermore, Japanese Patent Application Laid-Open No. 52-46174 describes a guide having a circular guide hole and in which the inner wall of the guide hole at the entrance of the weft exit gap also maintains a solid shape. Since the guide has a considerable radius at the connection part of the inner wall of the guide hole with the weft escape gap,
When the weft exhibits a behavior along the inner wall of the guide hole, it is guided by the radius and moves toward the weft exit gap, and there is also a concern that the weft may fly out.

The present invention has been made in view of the above circumstances, and the angle formed by the inner wall of the guide hole connected to the weft escape gap is approximately right or obtuse, and the angle between the inner wall of each guide hole and the weft escape gap is made substantially right or obtuse. By substantially forming an edge in the connecting portion, when the weft yarn is guided by the inner wall of the guide hole in the vicinity of the entrance of the weft exit gap, the weft yarn is given guidance and directionality into the hole, The weft yarn will come out from the weft escape gap.
It is designed to make it smaller.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 3 shows an embodiment of the invention.

A weft guide hole 22 and a weft exit gap connected to the guide hole 22 are formed in the guide elements 2°1 arranged in parallel in the weft insertion direction. The guide hole 22 is formed in a circular shape except for the vicinity of the entrance of the weft escape gap 230, and the guide hole inner walls 2" 2m and 22b connected to the weft escape gap 2'3 are each straight, and the angle 0 formed by them is An edge 24 at 24 b is formed at the connection portion between the guide hole inner walls 22 m and 22 b and the weft escape gap 23 .

Reference numeral 25 denotes an auxiliary nozzle, the ejection direction line t of which intersects obliquely with the axis of the guide hole 22 (the axis of the guide passage).

In this configuration, under the action of the air ejected from the auxiliary nozzle 5 and the air reflected from the inner wall of the guide hole 22, the weft yarn flies through the guide hole 22 without swinging and is held near the inner wall of the guide hole 22. When this occurs, the swirling flow S caused by the ejected air
1 or S2 and is guided against the inner wall of the guide hole 22, the weft yarn may naturally be guided to the inside of the guide hole hzza or 22b which is connected to the weft escape gap 23.

However, the guide hole inner wall 221 connected to the weft escape gap a23
Since the angle formed by
Depending on the directionality of the motion imparted to the weft and its image carrying verticals when heading towards b, for example, the air and weft from the C direction are divided into el and C2 directions, of which the C2 direction As the movement of
As a result of jumping over the 0 entrance part, the probability that the weft yarn jumps out from the weft escape gap i1!123 is reduced.

Of course, the more obtuse the angle θ is, the greater the effect of directing the weft yarn and its transfer air inward.

In addition, due to the obtuse angle, there is a concern that the weft may escape from the weft escape gap @ 23 during the reed beating process, but it is sufficient to adjust the installation angle of the guide 21 to the reed. There is no problem as it can be dealt with.

In addition, between the guide hole inner walls 22&, 22b and the weft escapement space 112,
Since edges 24m and 24b are formed at the connecting portion with 3, almost no adhesion occurs due to the wall effect. However, if the edges 24m and 24b are about 0.5 squares, which is unavoidable due to the molding of the guide 21, they can be sufficiently considered as edges.

In fact, the present inventors compared the case of #-70° (conventional) and the case of θ cod 90° (invention) for a guide hole with a diameter of 7 φ. [I tried a test experiment. As a result, the incidence of weft insertion defects is 0-70.
In the case of θ-90°, it occurred once in 2,000 to 3,000 picks, but in the case of θ-90°, it occurred once in about 30,000 picks, which was a significant improvement. .

FIG. 4 shows another embodiment.

The guide hole 32 of the guide element 310 in this embodiment has a topography, but the inner wall 32 a of the guide hole is connected to the weft escape gap 33.
The angle θ formed by * 32 b is made obtuse, and edges 34 a * 34 b are formed at the connecting part between the guide hole [132 a m $ 2 b and the weft escape gap 33, and this also has the above-mentioned shape. Effects equivalent to those of the example can be obtained. Note that 35 is an auxiliary nozzle.

Note that the above description has mainly focused on the case of the auxiliary nozzle method; however, the present invention is also applicable to the above-mentioned main nozzle method and combination method.

As explained above, according to the present invention, the weft escape gap-
The angles formed by the inner walls of the guide holes connected to each other are approximately right angles or obtuse angles, and an etch is substantially formed at the connection between the inner walls of each guide hole and the gap for weft escape, so that the weft and the air for transporting it are When the weft yarn is guided along the inner wall of the guide hole, it is directed inward by its own direction of motion, which reduces the probability that the weft yarn will jump out of the weft escape gap, thereby increasing weft insertion errors. The effect is that the width can be reduced.

[Brief explanation of the drawing]

Figures 1 and 2 are side views showing the conventional example, respectively, and 1I.
Fig. Xa is a side view showing one embodiment of the present invention, and Fig. 4 is a side view showing another embodiment. 21.31... Guide element 22.32... Guide hole 2
2ae22b, 32m, 32b,, guide hole inner wall 23
゜33--Weft escape gap 11 24a*24b, 3
4at34b...Era f 25,35...Auxiliary nozzle patent Applicant Nissan Motor Co., Ltd. Agent Patent attorney Fujio Sasashima Figure 3

Claims (1)

[Claims] A guide (21° 31) having a weft guide hole (22, 32) and a weft escape gap II (23, 33) connected thereto.
In a 5K air injection loom, the guide holes (22, 32) are arranged in the weft insertion direction and the weft is inserted by generating a weft conveying airflow in the guide hole (22, 32). The angle (0) formed by the inner walls of the holes (22m, 22b, 32a*321s) is approximately a right angle or an obtuse angle, and the inner walls of each guide hole (22'e22b-3
2m. 32b) and the weft evacuation gap 1it (23, 33) is substantially z')ji(24at24b*34a*
34b).