JPH02229243A - Weft-insertion mechanism of loop weft-insertion loom - Google Patents

Abstract

PURPOSE:To prevent the weaving defect caused by the flotation of a fine line of a weft by holding the tip end of a forwarding weft with a yarn-end holding member and eliminating the slack of a return-side weft with a suction pipe, etc. CONSTITUTION:At a time 10 cause a slack on a return-side weft, the tip end of a forwarding weft is held with a yarn-end holding member 32 to prevent the propagation of the formed slack of the return-side weft to the forwarding weft. The slack of the return-side weft is eliminated with a suction pipe 12 or other weft-retraction means to prevent the beating of weft 6 in slackened state.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is a loop weft inserting loom, that is, a loop-shaped weft with the insertion end folded back is inserted into the warp opening, and the folded end is used as a leno thread. The present invention relates to a loom that performs a weaving operation in which threads are tied and recessed.

《Prior Art》 As is well known, a loop weft inserting loom holds the middle part of the weft thread in a folded manner with a needle and inserts the weft into the warp opening.
Weft insertion is performed by inserting a leno thread through the folded end and positioning it at the end opposite to the weft insertion side of the front of the weaving, and then retracting the 21 dollar from the warp opening and performing resetting. In order to prevent the weft yarn from loosening during reshaping, it is preferable to lock the weft folded end with the leno thread at the opposite end of the weaving front, and the weft yarn is not in a tensioned state. I am unable to insert the tangle thread properly. Therefore, the advantage of the conventional loop weft inserting loom is to make the levia 9 move in an arc so that the tip of the levia 9 at the advancing end is on the extension line of the front 7, as shown in Figure 7. The tension is applied to the weft yarn 6b during weft insertion by a tensile soar 13 provided in the yarn path between the weft bobbin 37 and the levia 9.

On the other hand, since the folded end 6c of the weft is positioned on the extension of the front 7 and the leno thread 20 is inserted through the end 7b on the side opposite to the weft inserting side of the front, and in general, the weft 6b on the return side is inserted with an arc-shaped rapier. 9, when the rapier reaches the advance end, a longer weft than necessary will be inserted into the warp opening, and when the rapier moves back, the weft on the return side 6b Looseness occurs. Therefore, in the loop weft insertion loom, a suction pipe (air suction vibrator) 12 is opened between the tensor washer 13 and the rapier 9, and the pipe absorbs the slack by sucking the base end of the return side weft 6b. It is said that

<<Problems to be Solved by the Invention>> Most conventional loop weft insertion looms perform weft insertion by moving the rapier 9 in a circular arc as shown in the 7th fl. Since it was used only for weaving, it was possible to completely prevent the weft yarn 6 from loosening by the tensawa social fabric l3 and the leakage pipe l2.

However, in order to weave a wider fabric with a loop insertion loom, the levia 9 is moved in a straight line as shown in FIG.
When a structure is adopted in which the folded end 6c of the weft inserted through the weft is transferred to an extension of the front 7 by the auxiliary conveyor 15, a problem has been observed in which the weft grains of the woven cloth are lifted up.

This invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a technical means for preventing the above-mentioned yarn lifting phenomenon in a loop inserting loom.

<Means for Solving the Problems> The weft insertion mechanism of the loop weft insertion machine according to the present invention inserts two wefts 6a and 6b folded back into a loop shape into the warp opening 5 and inserts the folded ends 6c. A means 15 for positioning the fabric on an extension of the front 7 and a pulling-back means 1 applying a pulling-back force to the return-side weft 6b of the two inserted wefts.
2. In a weft insertion mechanism of a lube weft insertion loom comprising:
The folded end 6c of the weft is located on the extension of the front 7, and at a timing after the leno yarn 20 is inserted through the folded end 6c, it advances to the opposite weft insertion end 7b of the front, and the return side weft 6b The present invention is characterized in that a yarn end holding member 31 is provided which is retracted at a timing after the loosening of the yarn is absorbed by the pulling back means 12.

<<Operation>> If the yarn end holding member 31 is not provided in the above structure, the above-mentioned weft lifting phenomenon will occur. This is because the auxiliary conveyance body 15 suddenly returns after passing the leno yarn 20 through the folded end 6c of the weft, and when the weft 6 is removed from this auxiliary conveyance body, the return side weft 6b is momentarily loosened. As a result, this loosening propagates to the going side weft 6a attached to the front of the weaving, causing slack in the going side weft 6a, and since the folded end 6c of the weft is held by the leno thread 20, the going side weft 6a becomes loose. The slackness of the side weft 6a cannot be absorbed by the weft pulling force of the suction pipe 12, and the slack of the side weft 6a
It is presumed that this is caused by being hit while it is still loose.

This phenomenon is caused by the return side weft 6b being loosened at a faster speed than the pullback speed by the weft pullback stage 12.
This is considered to be a phenomenon that always occurs from time to time, such as when trying to widen the weaving width of a loop insertion loom, when trying to move Revia 9 at a higher speed, and when trying to reduce the power consumption of a suction blower. This may occur.

According to the structure of the present invention, each time the yarn end holding member 31 is provided, the looseness of the return side weft 6b is not transmitted to the going side weft 6a, so it is possible to prevent the sudden loosening of the return side weft. Even if an attempt is made, the going-side weft 6a will not become loose, and the loosening of the returning-side weft 6b will be reliably absorbed by the weft pull-back means 12, so that the weft lifting phenomenon can be completely prevented.

<<Embodiment>> FIG. 1 is a perspective view showing an embodiment of the weft inserting mechanism of the present invention. In the figure, 2 is a sleigh attached to the frame of the loom so that it can swing freely, 3 is a reed, 4 is a warp thread passed through the reed 3, and 5
is a warp opening formed by the upper and lower warp threads, 6 is a weft thread, 7 is a weaving front, 8 is a guide frame provided adjacent to the weft inserting side of the sley 2, and 9 is slidably installed in the guide frame 8 10 is an engagement hole drilled in the band rapier 9, 11 is a 21 dollar fixed to the tip of the band rapier 9,
12 is a suction pipe installed above the guide frame 8, and 13 is a tension washer. One end of the weft yarn 6 is connected to the weft insertion side end 7a of the front 7, and the other end is connected to a weft bobbin (not shown) through the twenty-one dollar thread 14, the opening of the suction pipe 12, and the tensile sock 13.

Generally shown, 15 is an auxiliary conveyor provided on the side opposite to weft insertion, and 16 is an L-shaped thread removal plate fixed to a stationary member 17, which is attached adjacent to the sley 2, and its upper edge is The position is slightly lower than the sliding surface of the slide 2. 18 is a leno thread device with a built-in leno thread bobbin. Auxiliary carrier l
5, a rotating piece 23 is provided on a support seat 22 fixed to a stationary member (not shown) so as to be rotatable around a vertical axis, and a swinging plate 24 is fixed to the rotating piece so as to be swingable. A hook-shaped hook 25 is formed at the tip of the wire fixed to the plate. The cloth 25 faces the side of the thread removal temporary 18 and is attached to the thread removal plate 1.
It is located slightly below the upper edge of 8. A lever 26 is connected to the crankshaft of the loom, and a horizontal rod 27 provided at the tip thereof is connected to an arm 28 projecting from the rotating piece 23. 29 is a vertical rod pivotally attached to the base end of the swing plate 24. The hook 25 is connected to the lever 26
The oscillating motion causes circular arc movement in the horizontal direction, and vertical Rondo 2
The vertical movement of 9 causes it to appear and disappear on the Revia's running line.

As shown in FIG. 2, the leno thread device 18 is fixed to a stationary member 19 on the extension line of the woven fabric slit 7, and the leno thread 20 let out from the leno thread device is attached to the end of the woven slit 7 on the side opposite to the weft insertion side. It is connected to 7b.

The leno thread 20 moves the leno thread bobbin upward or downward when the tip of the weft thread 6a passes through the gap between the leno thread bobbin and its guide and reaches the extension of the weaving front 7 (on the back side of the leno thread bobbin). As a result, the weft yarn 6 is inserted through the folded end. Reference numeral 30 shown in FIG. 1 is a driving iron for moving the leno thread bobbin up and down.

As shown in the first time and FIG. 3, the yarn end holding device 31 is
It is attached to the immovable member 19 at a position adjacent to the end 7b on the side opposite to the weft inserting side of the fabric front. In this device 31, the upper end of a link 33 on which an L-shaped presser bar 32 is fixed is pivotally supported on a bracket 34 erected on a stationary member 19, and the lower end of the link 33 is swung by a fork 35 interlocking with a crankshaft. It is something that makes you work hard. 36 works with the presser bar 32 to hold the weft 6a
It is a receiving seat that supports the tip of the holder, and is fixed to the immovable member 19.

Next, the weft insertion operation will be explained based on FIGS. 2 to 6.

As the needle 11 advances, two weft yarns 6a and 6b on both sides of the yarn stitch 14, one on the forward side and the other on the return side, are inserted into the warp opening 5. When the needle 11 reaches its advanced end, the hook 25 moves upward from the retracted position, hooks the folded end 6c of the weft yarn, conveys it to an extension of the front 7, and carries the going side weft 6a along the front 7. let Along with this conveying operation, the leno thread 2
0 is inserted into the tip of the going side weft 6a (FIG. 2). Next, the presser bar 32 moves downward and the receiving seat 3 receives the side weft 6a.
6 (FIG. 3), and the hook 25 returns to the Revia's retracted position via the opposite path to that described above.

By this return operation, the weft 6 is released from the cloth 25, and the loosening of the weft (indicated by the image line in FIG. 4) that occurs at the time of release is not propagated to the going side weft 6a due to the action of the presser bar 32, and is not propagated to the returning side weft 6b. Looseness is absorbed by the suction vibrator l2 (solid line in Figure 4). Then, while the twenty-one dollar 11 is retracted from the warp opening 5, the presser bar 32 is returned, and the returning twenty-one dollar The return side weft 6b stretched between the weft 11 and the weft 11 is driven into the front 7.

<<Effects of the Invention>> As described above, according to the structure of the present invention, the yarn end holding member holds the tip of the going side weft at the timing when the returning side weft becomes loose, so that the returning side weft is not loosened. However, the slack does not propagate to the weft on the going side, and the slack on the weft on the return side is absorbed by the suction pipe or other weft pulling means, so the weft will not be beaten with looseness remaining in the weft, and the weft Weaving defects caused by raised threads can be completely prevented.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the weft inserting mechanism of the present invention, Fig. 2 is a plan view of the main part showing the state when 21 dollars are advanced, and Fig. 3 is a side view showing the thread end holding member in the advanced state. , Fig. 4 is a plan view of the main part showing the state when the yarn end is retracted by 21 dollars, Fig. 5 is a plan view showing the retracted state of the thread end holding member, and Fig. 6 shows the state just before reshaping. FIG. 7, which is a plan view of the main part, is a schematic diagram of a circular motion type loop weft inserting loom. In the figure, 5: warp opening 6: weft 7: m front 12: suction pipe I5: auxiliary transport body 32: yarn end holding member

Claims (1)

[Claims] The two wefts (6) folded back into a loop shape are inserted into the warp opening (
5) and the folded end (6c) to the front (7)
A loop weft inserting loom comprising means (15) for positioning the weft on an extension of In the weft insertion mechanism, the folded end of the weft (6c)
is located on the extension of the front (7) and its folded end (
6c), the leno thread (20) advances to the opposite weft inserting end (7b) of the weaving front, and the slack of the return side weft (6b) is absorbed by the pulling back means (12). A weft inserting mechanism for a loop weft inserting loom, characterized in that a yarn end holding member (31) is provided which is retracted at a timing after the thread is inserted.