JPH09316754A - Weft yarn tension stabilizer for fluid jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the top of weft yarn from being woven into the fabric by more accurately sustaining the weft tension after the jet flow for inserting the weft yarn is stopped, relating to a weft yarn tension stabilizer for a fluid jet type loom. SOLUTION: This stabilizer is constituted so that a plate 2 for holding the top edge of the weft yarn set in front of the reed 1 on the side edge of the weft-inserting nozzle and the beating is carried out in the state that the top end of the weft is stuck to the weft-holding plate. In this case, a nozzle 13 is set so that it points from the diagonal front lateralized on the weft-inserting nozzle in front of the weft top-holding plate 2 toward the moving trace of the weft top holding plate 2 after the fluid jet completes and a fluid, for example, air, water or their mixture is jetted from this nozzle 13, after the completion of fluid injection for weft insertion. Further, the nozzle 13 is connected through an ejector 27 to a blower 28 and a box 21 for receiving the weft-inserting water, whereby a gas-liquid double-phase flow can be simply jetted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid jet loom,
Particularly, the present invention relates to a weft tension stabilizing device suitable for a water jet loom, and relates to a device for holding the weft under a certain amount of tension between the time when the weft is inserted by the weft inserting jet and the time when the weft is beaten. Is.

[0002]

2. Description of the Related Art A fluid jet loom has an advantage of being capable of high-speed weft insertion operation, but it has a problem that the tip of the weft-inserted yarn sways and is not stable, or from the weft insertion to beating. There is a problem that the tension of the weft yarn between the two changes greatly. The return of the weft tip after the end of the weft inserting jet is a phenomenon that occurs because no tension is applied to the weft tip, and indicates that there is a considerably uneven tension distribution along the longitudinal direction of the weft. . In a fluid jet loom, weft insertion is performed without restraining the tip of the weft thread. Therefore, it is unavoidable that the tension and tension distribution of each weft thread will vary. In order to prevent weaving defects from occurring in the weft and to obtain a high-quality woven fabric in which the tension of the weft is uniform, it is important to reduce the change in the tension of the weft as much as possible.

As one means for equalizing the weft tension,
In a water jet loom, a plate is provided on the front side (texture side) of the lure at the side of the anti-weft insertion nozzle of the lure, and the tip of the weft after wefting is attached to this plate by the surface tension of water. As a result, technical means for preventing the weft yarn from dancing and for making the weft yarn tension and tension distribution uniform have been used.

The applicant of the present invention has filed in Japanese Patent Application Laid-Open No. 7-1504.
In Japanese Patent Publication No. 41-41, by providing a front funnel-shaped jet convergence guide on the front surface of the plate, the vertical width of which converges toward the downstream side of the weft-insertion jet and the downstream end of which is a parallel rectifying portion. , We have proposed a structure that stably holds the weft yarn tip in a more accurate position. This JP-A-7-15
According to the structure disclosed in Japanese Patent No. 0441, the jet flow that is gradually diffused after being jetted from the weft insertion nozzle is converged to the regular position by the jet flow convergence guide, thereby preventing the weft thread from dancing and accurately. It is possible to impart tension to the tip of the weft and uniformize the tension distribution of the weft by the jet flow that is accelerated by being guided to and converged at various positions.
Then, the tip of the weft whose position and tension are made uniform by the jet convergence guide sticks to the plate on the back surface of the jet convergence guide by the surface tension of water, and the beating is performed in this state.

[0005]

If the weft yarn has no tension at the time of beating, a dense weave structure cannot be obtained. Therefore, the weft yarn needs to be beaten with some tension. The structure in which the jet flow converging guide is provided is also effective in this sense, because the tension of the weft yarn can be increased by accelerating the jet flow at the end portion on the side of the anti-weft insertion nozzle to pull the tip of the weft yarn.

However, the jet for weft insertion has a crank angle of about 3
It ends at 00 degrees and then crank angle 0 degrees (36
There is a time zone in which the weft is not pulled by the jet until the beating is performed at 0 degree. During this time, the tip of the weft is only attached to the weft tip holding plate provided on the side of the counterweft insertion nozzle of the lure by the surface tension of water, so that the tension of the weft is pulled back and the tension of the weft is Will fall. Particularly, in the case where the jet convergence guide is provided, the high tension applied to the folded weft cannot be held until the beating timing, and the effect of the jet convergence guide is halved.

Further, when the weft inserting jet is stopped, the force that pushes the tip of the weft yarn to the side of the anti-weft inserting nozzle also disappears, so that the end of the weft held by the catch cord extending to the side of the anti-weft inserting nozzle becomes the catch cord. It also happens that it is twisted around and shaken on the cloth fell side to be woven.

According to the present invention, the tension applied to the weft during weft insertion can be maintained more reliably from the time when the jet for weft insertion is stopped to the time when the weft is beaten. An object of the present invention is to obtain a technical means capable of preventing the weaving of the weft into the cloth fell, and to obtain a technical means for holding the tension of the weft yarn more reliably by a simpler device.

[0009]

In the weft tension stabilizing device of the present invention, a weft end holding plate 2 parallel to the weft flying direction is provided on the front surface of the tooth 1 at the end portion on the side of the anti-weft insertion nozzle. In the weft tension stabilizing device of the fluid jet loom, in which the leading end of the weft inserted is attached to the weft tip holding plate by the surface tension of the jet fluid, the weft tension stabilizing device of the fluid jet loom is provided in front of the weft tip holding plate 2. A nozzle 13 is provided from an obliquely forward position deviated to the weft inserting nozzle side toward the movement locus of the weft yarn end holding plate 2 after the fluid injection is completed, and this nozzle is provided after the fluid injection for the weft insertion is completed. It is characterized in that air, water, a mixed fluid thereof, and the like are jetted from 13.

The invention according to claim 2 has the above matters,
Further, a front funnel-shaped jet converging guide 8 having a shape in which the width in the vertical direction is narrowed toward the downstream side of the jet for weft insertion is provided on the front surface of the weft end holding plate 2, and the nozzle 1 is provided.
No. 3 is directed toward the funnel-shaped opening of the jet convergence guide 8 between the end of the weft inserting jet and the beating.

According to a third aspect of the present invention, in the weft tension stabilizing device of the fluid jet loom having the above-mentioned matters, the nozzle 13 is connected to the discharge port of the blower 28 and the water container via the ejector 27. The water container is a water receiving box 21 that receives jetted water at the end of the sley on the side of the anti-weft insertion nozzle.

[0012]

In the apparatus according to the present invention, the weft tip is continuously pressed against the weft tip holding plate 2 by the gas-liquid two-layer flow jetted from the nozzle 13 until the wetting is started after the jet for weft insertion is stopped. Furthermore, since the transfer force to the anti-weft insertion nozzle side is continuously applied to the weft tip by the gas-liquid two-layer flow, the reduction rate of the weft tension that occurs between the end of the weft insertion jet and the beating is determined. It is possible to reduce the size of the weft thread and prevent the weft thread tip from being woven by the weft thread tip being swung toward the nozzle side.

In particular, according to the structure of claim 2 in which the jet converging guide 8 is provided on the weft yarn end holding plate, the gas-liquid two-layer flow ejected from the nozzle 13 is converged by the jet converging guide 8 to accelerate the weft yarn. Since the large tension is continuously applied to the tip, the tension of the weft yarn before beating can be maintained at a higher value.

According to the third aspect of the invention, since the water is accelerated by the air flow of the blower to inject the gas-liquid two-layer flow from the nozzle 13, there is no need to provide a new pump or the like, and the structure is simple. Since the water droplets can be jetted through the gas at a high speed, a far greater pressing force and tension can be applied to the weft yarn tip than in the case of jetting only the gas.

Further, according to the structure of claim 3, the water used for weft insertion can be reused, and the water used for weft insertion can be sucked and jetted immediately after the end of the weft insertion. Water suction is also performed at a reasonable timing, and since the nozzle 13 and the water receiving box 21 are close to each other, the water pipe can be shortened.

[0016]

1 and 2 show an embodiment of the present invention. In FIG. 1, a weft tip holding plate 2 is attached to the end of the tail 1 on the side of the anti-weft insertion nozzle with the lower edge fixed to the lower channel of the tail so as to be positioned in front of the tail 1 (on the cloth fell side). Has been. In this weft end holding plate, the weft is bent in a V shape between the opening 4 through which the catch cord 3 passes, the opening 6 for avoiding interference with the weft detection sensor 5, and the weft tension plate 19 at the time of beating. And an opening 7 for holding the same.

Further, on the front surface of the weft yarn end holding plate, there is provided an upper guide plate 8A which is inclined toward the side opposite to the weft inserting nozzle, that is, toward the downstream side of the jet for weft insertion.
By the lower guide plate 8B inclined in the ascending direction, the jet convergence guide 8 whose width in the vertical direction becomes narrower toward the downstream side of the jet is provided. The jet flow converging guide 8 shown in the figure is formed by bending the upper guide plate 8A and the lower guide plate 8B in the direction parallel to the weft inserting jet at the downstream end portion thereof to form a straightening portion 8C. By guiding the tip of the weft to 8C, the tip of the weft is stably held at a predetermined position.

On the apron side of the loom, there is provided a water blocking plate 9 facing the weft end holding plate 2, and the side edge of the water blocking plate on the weft insertion nozzle side is bent toward the OSA 1 side. The weft tension plate 19 described above is formed. A piping block 10 and a suction pipe 11 extending horizontally from the piping block to the anti-weft insertion nozzle side are fixed to the front side (anti-oscillation side) of the water blocking plate 9, and further on the upper surface of the piping block 10. Is connected to the suction pipe 11, the base end of the flexible pipe 12 is fixed, and the nozzle 13 is attached to the tip of the flexible pipe 12.

Adjacent to the weft insertion nozzle side of the water barrier plate 9,
The weft detecting device 5 is arranged, and the selvage cutter 18 is arranged on the weft inserting nozzle side. The part indicated by the reference numeral 14 on the left side of the selvage yarn cutter 18 is a woven fabric, 15
Is a warp yarn, 16 is a cloth fell, and arrow 17 is a weft yarn and a weft inserting jet. The weft detecting device shown in the figure has a structure in which the presence or absence of a weft is detected by the light passing through the light guided by an optical fiber.

A water receiving box 21 for receiving the jet water for weft insertion is attached to the end of the sley, which is not shown in the figure, which fixes the lower edge of the bob 1 on the side of the anti-weft insertion nozzle. The water receiving box 21 has a drain pipe 22 connected to the bottom surface,
An inner box 23 is provided so that the received water does not immediately flow out. The inner box 23 is connected to the filter 25 by a flexible pipe 24, and the water pipe 26 is connected to the ejector 27 from the filter 25.

On the other hand, the suction pipe 11 on the front side (the side of the upper side) of the water blocking plate is connected to the outlet of the ejector 27, and the inlet of the ejector 27 communicates with the outlet of the blower 28. The blower 28 is not specially provided for the device of the present invention. For example, the blower discharge air for generating a swirling flow in the weft storage device may be branched and used. It is also possible to use the compressed air in the factory equipment without providing such a blower.

With the above structure, the gas-liquid two-layer flow composed of a mixture of the discharge air from the blower 28 and the water from the inner box 23 of the water receiving box sucked by the ejector 27 is jetted from the nozzle 13. As shown in FIG. 2, the nozzle 13 is jetted at a position 3 at which the weft tip holding plate 2, particularly the jet convergence guide 8 formed on the front surface of the weft yarn end holding plate 2, ends the weft inserting jet.
While moving from 1 to the beating position 32, the nozzle 1
The jet 33 from the nozzle 3 collides with the front surface of the weft yarn end holding plate, in particular, with the funnel-shaped opening of the jet convergence guide provided on the front surface thereof from the front and obliquely on the weft insertion nozzle side. The injection direction can be adjusted by bending the flexible pipe 12 to an optimum position and angle.

As described above, in the case where the air containing water droplets is directed from the nozzle 13 toward the front surface of the weft tip holding plate 2, particularly in the case where the jet convergence guide is provided on the front surface of the weft tip holding plate, the jet convergence guide funnel. The end of the weft thread is ejected diagonally from the position offset to the weft nozzle side on the front side of the weft end holding plate toward the open portion of the weft until the beating is reached after the jet for weft insertion is completed. It is possible to prevent tension of the weft from decreasing before the beating by continuing to apply tension to the weft tip while pressing it against the weft tip holding plate 2, which enables weaving of a dense fabric. At the same time, it becomes possible to avoid the occurrence of a weaving defect when a weft having a large elasticity is used.

Further, it is possible to prevent the weft yarn tip from being swung toward the nozzle side by the oblique jet flow and being woven before the weaving to cause a weaving defect.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an example of an embodiment.

FIG. 2 is a plan view showing a jetting direction of a nozzle.

[Explanation of symbols]

 2 Weft end holding plate 8 Jet convergence guide 13 Nozzle 23 Inner box of water receiving box 27 Ejector 28 Blower

Claims (3)

[Claims] 1. A weft tip holding plate (2) parallel to the flight direction of the weft is provided on the front surface of the feed (1) at the end portion on the side of the anti-weft insertion nozzle, and the tip of the weft inserted is jetted. In the weft tension stabilizing device of the fluid jet loom, the weft tip is held while being attached to the weft tip holding plate by the surface tension of the fluid. A nozzle (13) is provided to inject the fluid from an oblique front, which is biased toward the weft insertion nozzle side, toward the movement trajectory of the plate (2), and the fluid is ejected from the nozzle (13) after the jet for wetting is completed. A weft tension stabilizing device for a fluid injection loom, characterized in that 2. The weft yarn end holding plate (2) is provided with a front funnel-shaped jet convergence guide (8) on the front surface of which the vertical width is narrowed toward the downstream side of the jet for weft insertion. In the device for stabilizing the weft tension of the fluid jet loom, the nozzle (13) faces the funnel-shaped opening of the jet convergence guide (8) between the end of the jet for weft insertion and the beating. The weft tension stabilizing device according to claim 1, wherein: 3. The nozzle (13) communicates with a discharge port of a blower (28) and a water container through an ejector (27), and the water container is a jet water at an end of the sley on the side of the anti-weft insertion nozzle. The water receiving box (21) for receiving the water according to claim 1.
Or the weft tension stabilizing device described in 2.