JPS6231100B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid injection type loom that inserts a weft into a weft opening using a fluid, and particularly relates to a weft guide member that forms a flight path for guiding the weft during weft insertion. It is about improvement.

Conventionally, in order to reduce the loss of the air injected into the flight path and to prevent the weft yarn from flying out from the flight path, as in the guide member 1 shown in FIGS. The main body is branched from the base 2 into a curved portion 4, and the tip portion 5 of the straight portion 3 and the tip portion of the curved portion 4 are close to each other leaving a weft escape opening 6 between them, The straight portion 3 and the curved portion 4 together form a weft flight path 9 below the weft escape opening 6, and the curved portion 4 is provided with a flexible tongue 7 in front of the weft escape opening 6. It is known that the outer end of the flexible tongue 7 abuts against the inner wall of the straight portion 3.

In such a conventional guide member, the flexible tongue piece 7 completely closes the weft escape opening 6 of the weft flight path 9 except when the weft yarn 12 is deformed to escape, thereby reducing air loss and preventing the weft yarn from jumping out. The intended purpose of prevention can be achieved.

However, in order to reliably pass the weft through the weft flight path formed by a large number of such guide members 1,
Since a fairly high-speed air fluid must be used, the flexible tongue 7 directly facing the weft flight path is strongly influenced by the high-speed fluid flowing in the weft flight path, causing vibrations and causing turbulence in the fluid flow. may occur. The occurrence of turbulence brings about unexpected situations such as the weft waving in the weft insertion direction or the tip of the weft hitting a guide member near where the turbulence has occurred. In addition, in order to prevent the leaf spring from vibrating, it is possible to reduce its length, but in that case the spring constant of the flexible tongue would increase, so the weft yarn would not be able to reach the flight path as shown in Figure 2. When the weft yarn escapes immediately before beating after threading, the tongue pieces create a large resistance, which is undesirable.

Therefore, an object of the present invention is to provide a fluid jet loom having a structure capable of reducing air loss and preventing weft yarns from flying out, and which does not cause any incidental drawbacks due to such a structure. It is an object of the present invention to provide a weft guide member in the present invention.

In order to achieve the above object, according to the present invention,
It has a main body that is branched into a substantially curved part and a substantially straight part, and the curved part and the straight part form a weft running path for guiding the weft, and their tip parts are connected to the weft running path. In a weft guide member configured to form a continuous weft escape opening, one surface of the tip portion forming the weft escape opening is located a predetermined distance from the surface of the other tip portion at a position facing the weft flight path. a spaced-apart non-flexible first portion; a concave-convex non-flexible second portion following the first portion and forming a relatively large decompression space; the surface of the other free end; is characterized in that it is substantially composed of a single surface, and allows the weft to pass through the weft escape opening without substantially changing its path.

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

FIG. 3 shows the first guide member 1' according to the invention.
This figure shows an embodiment, and the same or corresponding parts in the figure are given the same reference numerals as those used in FIG. 1.

The main body of the guide member 1' is branched from the base 2 into a substantially straight portion 3 and a substantially curved portion 4;
The straight portion 3 extends substantially straight upwards, and the curved portion 4 extends curvedly above the straight portion 3;
A weft running path 9 is formed between the two, and a weft escape opening 6 is provided between the tip portions 3a and 4a to allow the weft to escape from the weft running path 9 during beating. . This weft escape opening 6
is formed by the upper surface of the tip portion 3a and the lower surface of the tip portion 4a, and the upper surface of the tip portion 3a has a distance between the top surface of the tip portion 3a and the lower surface of the tip portion 4a at a position facing the weft thread flight path 9, which is sufficient for the weft to pass through. It consists of a mountain-shaped first part 3a' that approaches while leaving a predetermined distance, and an uneven second part 3a'' that continues from this first part 3a'. Both the first part 3a' and the second part 3a'' It is non-flexible and firmly supported by the first branch 3. The second part 3a'' has a recess immediately behind the first part 3a' that creates a decompression space 3b that is considerably wider than the space created between the first part 3a' and the lower surface of the tip part 4a, and and a convex portion spaced apart from the bottom surface of the free end 4a at approximately the same distance as the distance between the first portion 3a' and the bottom surface of the tip portion 4a. .A concrete example is the first
The distance between the portion 3a' and the second portion 3a'' with respect to the tip portion 4a is 0.2 to 0.4 mm, and the depth of the decompression space is 0.5 to 0.4 mm.
It is 2mm.

On the other hand, the lower surface of the tip portion 4a along which the weft yarn passes when it escapes is substantially composed of a single smooth surface. Advantageously, this lower surface also substantially follows the direction of the rocking movement when the guide member swings. Since the lower surface of the free end has such a surface, the weft escape opening 6 has a curved shape, but the locus or path of the weft yarn passing through it is substantially straight.

If the guide member is configured as described above according to the present invention, the first portion 3a' facing the weft flight path 9 is inflexible and is firmly held by the first branch portion 3, so that The first part 3a' does not vibrate under the influence of the high-speed airflow injected into the flight path 9, and there is a wide decompression space 3b behind the first part 3a', and the space is behind the first part 3a'. Due to the presence of the second section 3a'' in the space 3b, even if a small amount of air escapes through the first section 3a' during weft insertion, this air undergoes a large pressure drop in the space 3b, and furthermore the second section 3a'' Since the passage of the weft yarn is restricted, it is possible to effectively reduce air loss and prevent the weft yarn from flying out. Furthermore, although the lower surface of the tip end portion 3a has a relatively curved shape with the first portion 3a' and the second portion 3a'', the locus of the weft yarn relatively passing through the weft escape opening 6 is substantially arcuate. Because of its shape, no undue force is applied to the weft yarns when they are pulled out, contributing to faster looms.

FIG. 4 shows a second embodiment of the invention.
The difference from the first embodiment is that a weft escape opening 6 is formed between the left side surface of the tip portion 4a of the curved portion 4 and the right end surface of the tip portion 3a of the straight portion 3, and the first portion 4
A' and the second portion 4a'' are formed on the side of the curved portion 4, but the above-mentioned effects are the same as in the first embodiment.Furthermore, FIG.
This is an example, and the differences from the first example are as follows.
The second portion 3a'' on the upper surface of the tip portion 3a has two concave portions and two convex portions.In this third embodiment, there are therefore two decompression spaces 3b, which further reduces air loss. can be reduced.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of the operation of a conventional guide member, and FIG. 3 is a front view of the first embodiment of the present invention.
FIGS. 4 and 5 are front views showing second and third embodiments of the present invention, respectively. DESCRIPTION OF SYMBOLS 1... Weft guide member, 3... Straight part, 3a... Tip part of straight part, 3a', 4a'... First part, 3
a″, 4a″…second part, 3b, 4b…decompression space, 4
...Curved portion, 4a... Tip portion of curved portion, 6... Weft escape opening, 9... Weft flight path.

Claims (1)

[Claims] 1 It has a main body that is branched into a substantially curved part and a substantially straight part, and the curved part and the straight part form a weft running path for guiding the weft, and their tip portions form a weft running path for guiding the weft. In a weft guide member configured to form a weft escape opening communicating with the weft escape opening, one surface of the tip portion forming the weft escape opening has a non-flexible guide member spaced a predetermined distance from the surface of the other tip portion. a flexible first portion, and a concave and convex non-flexible second portion following the first portion and forming a relatively large decompression space; A weft guide member for a fluid jet loom, characterized in that it is configured with a surface.