JPH0680225B2 - How to restart a fluid jet loom - Google Patents

Description

TECHNICAL FIELD The present invention relates to a starting method for a so-called idle start in a fluid jet loom.

(Prior Art) In a conventional fluid jet loom, when the stopped loom is restarted, the weft inserted into the warp shed is removed, and then the loom is reversed to the restart start phase, and the loom is restarted from this state. A so-called blank start for restarting the vehicle is generally adopted.

(Problems to be Solved by the Invention) When the above-described reversing of the loom at the time of restart, the selvage yarn for restraining the weft yarn at the end of the woven fabric to improve the selvage formation of the woven fabric. Since the selvedge device that supplies the yarn is also rotated in the reverse direction, the weft yarn that is placed in the reed position at the time of restart is no longer constrained by the selvedge yarn at the end. In particular, when a textured yarn or a twisted yarn is used as a weft yarn in a water jet loom, the weft itself shrinks (beveled weft yarn is in a state of being stretched to some extent during weft insertion, so that when the weft is not restrained There is a problem in that the end of the woven cloth on the weft inserting means side is damaged due to the shrinkage.

This will be described with reference to FIGS. 5 and 6. 1 is a loom frame, 2 is a back roller, 3 is a heddle frame, 4 is a reed, 5 is a breast beam, and warp yarns are supplied from a warp beam (not shown). W passes through the back roller 2, the heddle frame 3, the reed 4, and the breast beam 5, and reaches a woven fabric winding device (not shown). Ear ears 6 are provided behind the heald frames 3 of the left and right frames 1, respectively.

FIG. 5 is a diagram showing the relationship between the warp and the weft in the preparation for restarting the loom. When the loom is stopped, the upper and lower warps W ₁ , W ₂
The weft insertion path is formed by the weft insertion path, and the weft thread a is inserted into the weft insertion path as shown in FIG. 5 (I). Next, the weft a is pulled out from the warp shed as shown in FIG. 5 (II), and the weaving machine is made to rotate in the reverse direction by one rotation as shown in FIG. 5 (III), and the weaving machine is restarted from that state. The selvage yarns LY ₁ and LY ₂ open and close in synchronization with the opening and closing movement of the warp.
In this case, the maximum opening timing and the closing timing may have some phase difference with each other. Therefore, Fig. 5 (II
In the state of I), the weft b exposed in the warp shed is in a free state, that is, in this case, there is little restraint by the warp and the selvedge braid, so that when the processed yarn or the twisted yarn is used as the warp, Due to the shrinkage, the weft yarns do not exist in a uniform state over the entire width of the cloth. That is, there is no weft yarn at the edge of the woven fabric, or even if it is present, there is a large difference in tension from the central portion of the woven fabric, or if it does not extend straight, scratches occur on the woven fabric, and It sometimes caused a drop.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, when the loom is stopped, the weft inserted into the warp shed is removed, and then the loom is reversed to the restart start phase. Then, in the fluid jet type loom in which the loom is idled and restarted from this state, at the time of the reverse rotation of the loom, at least the weft inserting means restrains the weft end portion by the selvedge yarn at the woven fabric end portion. Do not release the side and restart the fluid jet loom.

(Operation) In the present invention, when the above-described weaving machine is rotated one rotation backward, at least at the end of the woven fabric on the side of the weft inserting means, the inserted weft is restrained by the selvage yarn, and a restraining force is applied to the weft. By the way, I tried to suppress the shrinkage of the weft itself,
Even if the weaving machine is rotated in reverse for the idle start, the weft can be restrained by the selvage, so that the weaving damage caused by the contraction of the weft can be prevented.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 4. In the figure, the same reference numerals as those used above denote the same components.

The frame 1 of the loom according to the present invention is fixed with a bracket 8 having guide members 7 for the heddle frame 3 mounted on the top and bottom. Further, an electromagnetic solenoid 10 is fixed to the bracket 8 via a bracket 9, and a pin 10a attached to a tip of the solenoid 10 is provided at a central portion of a selvage yarn guide member 11 also attached to the bracket 9. Hole 11a formed in
It is designed to enter and leave.

The loom is stopped (state of FIG. 5 (I)), and the weft a is removed (state of FIG. 5 (II)) (see FIG. 2),
Then, for restarting, the loom is reversed (inching or manual) to the restart start phase. At this time, the above-mentioned solenoid 10 is excited and the pin 10a is projected, so that the selvage guide member 11
The space between them is divided into two spaces, upper and lower. Selvage yarn LY ₁ , LY
₂ is guided to the cloth fell through the space in the guide member 11, so that the selvedge device 6 is reversed by the reverse rotation of the loom and the selvage yarns LY ₁ and LY ₂ are reversed from the normal _one . Direction, that is, even if it is rotated in the direction to untwist the selvedge yarn, the pin 10a
As shown in the figure, twisting back is prevented. Therefore, the weft yarn b will continue to be constrained at its ends by the selvage yarns LY ₁ and LY ₂ . Then, when the loom is restarted, the pin 10a is withdrawn from the guide member 11 so that the normal selvedge operation is performed. (See Fig. 4) The pin 10a, and therefore the electromagnetic solenoid 10 is excited.
Demagnetization may be performed by operating a loom operation switch, for example, the inversion of the loom inching of the pin 10a and the loom start switch for withdrawal of the pin 10a, or a dedicated operation switch may be provided.

As means for preventing twisting back of the selvedge yarn, various means can be adopted without departing from the scope of the present invention, for example, the selvedge device itself is cut off from the main shaft of the loom when the loom is reversed. .

(Effect of the invention) As described above, in the present invention, when the weaving machine is rotated one revolution, at least at the end of the woven fabric on the weft inserting means side, the inserted weft is restrained by the selvage yarns, and Since the restraint force is applied to suppress the shrinkage of the weft itself, the weft can be restrained by the selvedge yarn even when the weaving machine is reversed to perform the blank start. Therefore, according to the present invention, It is possible to obtain the effect that it is possible to prevent the occurrence of woven damage due to the shrinkage of

[Brief description of drawings]

FIG. 1 is a partial elevation view of a loom to which the method of the present invention is applied, FIG. 2 is a partial side view showing an opening portion of selvedge yarn, FIG. 3 is an explanatory view of its action, and FIG. 4 is a method of the present invention. 5, (I), (II) and (III) are explanatory views of the operation of the warp shed of the loom, and FIG. 6 is a plan view of the loom. 1 ... Loom frame, 3 ... Heald frame 4 ... Reed, 6 ... Ear assembly device 7 ... Guide member, 8, 9 ... Bracket 10 ... Electromagnetic solenoid, 10a ... Pin 11 ... Ear assembly Guiding member, W ₁ , W ₂ ... warp LY ₁ , LY ₂ ... selvedge, a, b, c, d ... weft

Claims (1)

[Claims] 1. A fluid which, when the loom is stopped, removes the weft thread inserted into the warp shed and then reverses the loom to a restart start phase, and from this state, idles the loom and restarts it. In the jet loom, the method of restarting a fluid jet loom is characterized in that, when the loom is rotated in the reverse direction, at least the weft inserting means side does not release the constraint of the weft end portion by the selvedge yarn at the woven fabric end portion.