JPS59223338A - Weft yarn guide of jet loom - Google Patents

Abstract

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

Description

TECHNICAL FIELD The present invention relates to a weft guide for a jet loom with a weft guide passage.

BACKGROUND OF THE INVENTION In shuttleless looms such as air jet looms, weft threads are inserted into openings formed between warp threads using a pressurized fluid such as compressed air jetted from a weft insertion nozzle. During this weft insertion, a weft guide provided with a weft guide passage is used to prevent the spray fluid from the weft insertion nozzle from spreading and to reliably guide the weft. Such a weft guide is positioned in the opening formed between the warp threads when inserting the weft, and guides the weft reliably. On the other hand, during reed beating after weft insertion, the weft guide is located away from the warp threads, thereby interfering with the reed beating. It is necessary to be able to do it without any problems.

When the weft guide is reciprocated between the opening position and the position away from the warp, the weft guide and the warp rub against each other, and especially the tc The warp threads may be damaged by the threads in between, or the edges of the weft threads may be damaged by the warp threads.

When the warp threads are damaged by the edges of the weft guide, the warp threads become weaker and warp threads break, reducing the operating rate of the loom and reducing productivity. In addition, if the edges of the weft guide are damaged, the flow of the weft insertion fluid such as compressed air passing through the weft guide passage is disturbed, the flying condition of the weft becomes poor, and weft insertion errors occur. The operating rate of the loom decreases, resulting in a decline in productivity.

Purpose of the Invention As described above, an object of the present invention is to provide a weft guide for a jet loom that can prevent warp yarns from being damaged or weft flight from worsening due to friction between the weft yarn guide and the warp yarns. do.

Structure of the Invention In the present invention, this object is achieved by providing the weft guide #! of a jet loom equipped with a weft guide passage. The weft kite of the jet loom is formed by chamfering the M shield part between the first side and the weft guide passage.

As shown in the following embodiments, it is preferable that this chamfer is smoothly connected to the weft guide side surface by a convex curved surface and forms an edge with the weft guide passage.

In this case, the convex curved surface may extend from the weft guide side surface to the weft guide path, or a Taber surface may be interposed between the convex curved surface and the weft guide path.

The present invention is also applicable to a weft guide having an elastic piece in the weft guide passage. In this case, the thickness of the elastic piece is selected so as to be at most equal to the thickness of the weft guide of the weft of the chamfered portion.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail based on illustrated embodiments.

FIG. 1 shows an oblique view of the jet loom weft guide device according to the present invention. In Fig. R, a large number of weft guides 1, weft inserting nozzles 5, and reeds 6 embedded in a block 2 are provided on a sleigh 4. In synchronization with the movement of the crankshaft (not shown) of the loom, the sleigh 4 moves back and forth, and the weft guide passage 3 of the weft guide 1 is positioned at the opening position of the warp threads 7, which is indicated by a solid line in FIG. 2, and by a dashed line. move between the outer positions of the warp threads. The above structure is similar to the weft guide of a conventional jet loom.

In the conventional device, the weft guide 1 is provided with a weft guide passage 3 passing through its thickness, and the weft guide passage 3 is connected to the side surface of the weft guide 1 and the edge 1a (see FIG. 3).
It is also connected to the outside through a small gap, so that the weft thread can be pulled out from the weft guide path 3 during beating. As the weft guide 1 moves relative to the warp in this way, the warp 7 (indicated by a chain line in FIG. 3) moves between the weft guide 1, particularly the side surface of the weft guide 1, and the weft guide, as shown in FIG. Edge 1 where passage 3 meets
a, the warp yarns 7 were squeezed by the edge 1a, and as explained in the prior art, the edges damaged the warp yarns, and conversely, the warp yarns damaged the edges of the weft guide. The warp threads are damaged by the edges of the weft guide, resulting in warp breakage. Also, the edges of the weft guide are damaged, causing poor weft flight and weft insertion errors, resulting in the loom being damaged. This resulted in a decline in the utilization rate and productivity.

In the present invention, the above-mentioned problem is eliminated by eliminating the edge 1a that is inevitably formed in the conventional weft guide 1 where the weft guide passage 3 and the side surface of the weft guide 1 meet. . That is, in the present invention, as shown in FIGS. 4 and 5, the area where the edge 1a (FIG. 3) was present in the conventional weft guide 1 is chamfered 4 by a depth a to remove the edge. I removed it so that the warp threads would not get caught in edge 1a.

Here, it is preferable that the chamfered portion 4 is clearly connected to the side surface of the weft guide 13 by a convex curved surface, that is, a so-called Re-applied surface, and forms an edge with the weft guide path 3. . By forming a convex curved surface on the side surface of the weft guide 1, straining of the warp by the weft guide 1 is further reduced. In addition, the weft guide passage 3 and the chamfered part 4
When both are connected by a convex curved surface, the jetted fluid such as compressed air is diffused by the convex curved surface and flows into the gap between adjacent weft guides 1, which tends to cause disturbance of the jetted fluid. Therefore, it is preferable to form an edge between the chamfered portion 4 and the weft guide passage 3 on the inside of the side surface of the weft guide. By doing so, it is possible to prevent the jet fluid from flowing into the gap between the weft guides 1 and causing disturbance in the jet fluid.

Regarding the embodiments shown in FIGS. 6 to 8, the chamfered portion 4
The cross-sectional shape of will be explained in more detail. In the embodiment shown in FIG. 6, only the side surface of the weft guide 1 is formed into a convex curved surface 4a with a small radius of curvature, and is connected to the weft guide passage 3 by an edge 4b via a tapered surface.

In the embodiment shown in FIG. 7, the side surface of the weft guide 1 to the edge 4b is connected by a convex curved surface 4a with a large radius of curvature. In this case as well, it is connected to the weft guide path 3 by the edge 4b.

In the embodiment shown in FIG. 8, an edge 4b between the weft guide passage 3 and the chamfered portion 4 can be reliably formed, and the edge 4b is slightly larger than the weft guide passage 3. It is countercircled by a depth a from the center. By doing so, a flat surface 40 of the width wall surrounding the weft guide path 3 is formed at the bottom of the chamfered portion 4. This flat surface 4C
is parallel to the side surface of the weft guide 1 and perpendicular to the wall surface of the weft guide path 3, so that an edge 4b is reliably formed between the flat surface 4C and the weft guide path 3. In this case, as shown in FIG. 6, only the side surface of the weft guide 1 is formed into a convex curved surface 4a with a small radius of curvature, and connected to the weft guide passage 3 by an edge 4b through the tapered surface. As shown in Fig. 7, from the side of the weft guide 1 to the edge 4b, 1 is a convex curved surface 4 with a large radius of curvature.
You may also connect with a.

The present invention is also applicable to a weft id 1 having an elastic piece 8 in the weft guide passage 3, as shown in FIGS. 9 and 10. In this case, as shown in FIG. 10, the thickness j of the elastic piece 8 is selected as follows with respect to the thickness T of the weft guide 1, and the thickness j of the elastic piece 8 is Thickness T-2 of the weft guide of the acid amount of the chamfered part 4 chamfered by depth a
Make it equal to or less than a.

Effects of the Invention In the present invention, since the side surfaces of the weft guide are chamfered, no edges are formed on the side surfaces, and even if the weft guide and the warp rub against each other, the warp may be damaged or the edges of the weft guide may be damaged by the warp. You won't get hurt. Since the edges of the warp and weft guides are not damaged, there is no possibility of warp thread breakage or poor weft flight conditions resulting in weft insertion errors. Therefore, it is possible to weave a woven fabric of good quality, and the operating rate of the loom increases, thereby improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a jet loom weft guide device according to the present invention, FIG. 2 is a schematic side view showing the movement of the weft guide 1 during weaving operation, and FIG. 3 is a problem with the conventional weft guide 1. 4 is a side view of one embodiment of the weft guide of the present invention, FIG. 5 is a sectional view of FIG. 4, and FIGS. 6 to 8 are partially enlarged sectional views of FIG. 5. Each shows a different embodiment. FIG. 9 is a side view of another embodiment of the present invention, the first
0 is a sectional view of FIG. 9. 1... Weft guide, 3... Weft guide passage, 4
... Chamfered portion, 4a... Convex curved surface, 4b...
Etsuji, 8...Elastic Piece Patent Applicant Co., Ltd. Toyota Industries Corporation Patent Application Agent Eiji Sanaka Patent Attorney Kikue Yamamoto Figure 3 Figure 4. Figure 15, Final Figure, Figure 8, Figure C, Figure 11o.

Claims (1)

[Scope of Claims] 1. A jet loom weft guide (7) provided with a weft guide passage, wherein the weft guide of the jet loom is characterized in that a meeting portion between the weft guide side surface and the weft guide passage is chamfered. 2. The jet loom weft guide according to claim 1, wherein the chamfered portion is smoothly connected to the weft guide side surface by a convex curved surface and forms an edge with the weft guide path. 3. The weft guide for a jet loom according to claim 2, wherein the convex curved surface extends from the side surface of the weft guide to the weft guide path. 4. The weft guide for a jet loom according to claim 2, wherein a tapered surface is interposed between the convex curved surface and the weft guide path. 5. The weft guide has an elastic piece in the weft guide passage, and the thickness of the elastic piece is at most equal to the thickness of the weft guide on the bottom surface of the chamfered part.
The jet loom weft guide described in any one of the preceding paragraphs.