JPS62206059A - Method for restarting fluid 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 (Field of Industrial Application) The present invention relates to a starting method for a so-called dry start in a fluid jet loom.

(Prior Art) In a conventional fluid jet loom, when restarting a stopped loom, the weft inserted into the warp opening is removed, the loom is then reversed to the restart start phase, and the loom is restarted from this state. Generally, a so-called dry start is used to restart the engine.

(Problems to be Solved by the Invention) When the loom is reversed at the time of restart as described above, the selvage braiding thread is used to restrain the weft yarns at the ends of the woven fabric and to improve the selvage formation of the woven fabric. Since the selvage tying device that supplies the selvedge yarn is also reversed, the weft yarns placed at the beating position at the time of restart are no longer restrained by the selvedge yarns at the ends. In particular, when processed yarns or twisted yarns are used as wefts in water-jet looms, the wefts themselves shrink (beaten wefts are stretched to some extent during weft insertion, so when they are no longer constrained by the selvedge yarns, There is a problem in that fabric flaws occur particularly at the end of the woven fabric on the side of the weft insertion means.

To explain this using Figures 5 and 6, l is the frame of the loom, 2 is the back roller, 3 is the heald frame, 4 is the reed, and 5 is the presto beam, which is a warp thread supplied from a warp beam (not shown). W is a back roller 2, a heald frame 3, a reed 4,
It passes through the presto beam 5 and reaches a fabric winding device (not shown). Also, heald frame 3 of frame 1 on the left and right
Ear-closing devices 6 are provided on the rear side of each.

FIG. 5 is a diagram showing the relationship between the warp and weft in preparation for restarting the loom. When the loom stops, the upper and lower warps W,
The weft thread a is inserted into the weft insertion path formed by W2, as shown in FIG. 5(1).

Next, the weft yarn a is pulled out from within the warp opening as shown in FIG. 5(n), and the loom is reversed once as shown in FIG. 5(III), and the loom is restarted from that state. The selvedge threads LY+, t, and y2 are designed to open and close in synchronization with the opening and closing movement of the warp threads. In this case, there may be a certain phase difference between the maximum opening and closing timings.

Therefore, in the state shown in FIG. 5 (III'), the weft threads exposed in the warp opening are in a free state, that is, in this case, they are less constrained by the warp threads and selvedge threads, so processed threads or twisted threads are not used as the warp threads. If the weft yarn itself shrinks, the weft yarn no longer exists in a uniform state over the entire length of the weaving. In other words, there may be no weft yarns at the edges of the woven fabric, or even if there are weft threads, there may be a large difference in tension from the center of the woven fabric, or the weft threads may not extend straight, resulting in scratches on the woven fabric and resulting in poor quality. This could lead to a decline.

(Means for solving the problem) In order to solve the above-mentioned problem, in the present invention, when the loom stops, the weft inserted into the warp opening is removed, and then the loom is reversed to the restart start phase. However, in a fluid injection loom in which the loom is restarted by dry beating from this state, when the loom is reversed, the restraint of the weft ends by the selvage threads at the ends of the woven fabric is at least carried out by the weft inserting means. side, so that the fluid injection type m machine is restarted without being released.

(Function) In the present invention, when the above-mentioned loom is reversed once, the inserted weft is kept restrained by the selvedge yarn at least at the end of the woven fabric on the side of the weft insertion means, and a restraining force is applied to the weft. Because I tried to suppress the shrinkage of the weft thread itself,
Even if the loom is reversed to perform a blank start, the weft yarns can be kept restrained by the selvage yarns, so weaving flaws due to shrinkage of the weft yarns can be prevented.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 4. In the drawings, the same reference numerals as those described above indicate equivalent parts.

Brackets 8 are fixed to the frame 1 of the loom according to the present invention, to which guide members 7 for the heald frame 3 are attached at the top and bottom. Furthermore, an electromagnetic solenoid 10 is fixed to this bracket 8 via a bracket 9.
A pin loa attached to the tip of the bracket 9 enters and exits a hole 11a formed in the center of a guide member 11 for the selvedge yarn also attached to the bracket 9.

The loom stopped and the state shown in Fig. 5 (1)), and the weft thread a was removed (
The state shown in FIG. 5(n)) is changed to the folded position B (see FIG. 2), and then the loom is reversed (inching or manually) to the restart start phase for restarting. At this time, the solenoid 10 mentioned above is energized, the pin 10a protrudes, and the ear guide member 1
Divide the space between 1 and 2 into two spaces, upper and lower. Ear braid thread LY
Since the selvedge yarns E and LYz are guided to the weaving cloth through the space of the guide member 11C, when the loom is reversed, the selvage braiding device 6 is reversed, and the selvedge threads LY, LYz are moved in a different way than usual. Even if it is rotated in the opposite direction, that is, in the direction in which the selvage braid is untwisted, untwisting is prevented by the pin 10a as shown in FIG. Therefore, the weft yarns continue to be restrained at their ends by the selvedge yarns LY, LY2. Then, when the loom is restarted, the pin 10a is withdrawn from the guide member 11, and normal selvedge operation is performed.

(See Figure 4) This pin 10a, and therefore the electromagnetic solenoid 10, is energized and demagnetized by an operating switch of the loom, for example, pin 10a.
The entry of the loom may be linked with the loom reverse inching switch, and the exit may be linked with the loom start switch, or
A dedicated operation switch may also be provided.

Furthermore, as a means for preventing the untwisting of the selvedge yarn, various means can be taken without departing from the spirit of the present invention, such as separating the selvage tying device itself from the main shaft of the loom when the loom is reversed. .

(Effects of the Invention) As described above, in the present invention, when the loom rotates once in reverse, the inserted weft is kept restrained by the selvedge yarn at least at the end of the woven fabric on the side of the weft insertion means, so that the weft is Since the binding force is applied to suppress the shrinkage of the weft yarn itself, even if the loom is reversed to perform a dry start, the weft yarn can be kept restrained by the selvedge threads. The effect is that it is possible to prevent the occurrence of weave flaws due to shrinkage of the fabric.

[Brief explanation of drawings]

Fig. 1 is a partial elevational view of a loom to which the method of the present invention is applied, Fig. 2 is a partial side view showing the opening of the selvedge yarn, Fig. 3 is an explanatory diagram of its operation, and Fig. 4 is the method of the present invention. Flowchart, Figure 5 (1)
(n) (III) is an explanatory diagram of the operation of the warp opening of the loom, and FIG. 6 is a plan view of the loom. l... Frame of the loom 3... Heald frame 4... Reed 6... Ledge assembly device 7... Guide member
8.9...Bracket 10...Electromagnetic solenoid loa...Pin 11...Ear assembly guide member
W3, 6...Warp threads LY, , LYz...Selvedge threads a, b, c, d...Weft patent applicant Nissan Motor Co., Ltd. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] 1. A fluid injection type loom that, when the loom stops, removes the weft inserted into the warp opening, then reverses the loom to the restart start phase, and from this state, restarts the loom by running the loom dry. A method for restarting a fluid jet loom, characterized in that when the loom is reversed, at least the weft inserting means does not release the restraint of the weft ends by the selvedge threads at the ends of the woven fabric.