JPH01292142A - Device for treating weft yarn end of shuttleless loom - Google Patents

Abstract

PURPOSE:To reduce waste yarn consumption and eliminate miss-cut of weft yarns, by stretching a waste yarn on the outside of weft yarn rows in a specific state, constituting and providing a specified capturing part for weft yarns between a temple and a cutter. CONSTITUTION:A waste yarn 9 is obliquely stretched between guide rollers 11 and 12 so as to sterically cross a warp line (W.L.) and a capturing part 13 is constituted. The yarn 9 is passed through only between dents (4a) without threading a heald. A capturing tool 14 is provided in a yarn passage of the waste yarn 9 between a temple 10 and a cutter 19 and bent edges 17 of the bottom connecting to a guide surface 16 and weft yarns 7 are obliquely crossed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present application relates to a weft end processing device in a shuttleless loom, which securely captures inserted weft threads to prevent problems during m-manufacturing, and also prevents problems after weaving and dipping. The present invention relates to a weft end processing device that ensures reliable cutting of weft ends.

Weft insertion in shuttleless looms involves inserting long weft yarns into the warp shedding using air or water, which causes the weft yarns to stretch in a straight line if the weft ends are not captured reliably on the opposite yarn feeding side. Instead, the weft threads were woven with loose threads, causing a decrease in quality such as a large tension difference between the center and the edges of the weave. Furthermore, the weft ends must be cut while applying appropriate tension to the weft ends after weaving, and the weft ends must be cut to uniform lengths without causing cutting errors.

In order to ensure weft end processing, conventional shuttleless looms also use airflow on the opposite yarn feeding side to catch the weft that is being inserted, and use this airflow to apply a constant tension to the weft. Although various devices have been proposed, such as devices that capture the weft by mechanical means, they lack reliability in operation despite their complexity, and these devices themselves can cause trouble. In addition, in order to ensure the cutting of the weft ends (also for the purpose of preventing the selvage of the woven fabric on the anti-yarn feeding side from degrading the quality), on the anti-yarn feeding side, multiple weft yarns are placed on the outside of the warp yarns on the anti-yarn feeding side. (4-8
A waste thread of the cloth was stretched, and the end of the weft thread was woven in the same way as woven fabric using this waste thread, and then cut. The above-mentioned conventional weft end treatment is economically problematic because it consumes a large amount of waste threads, and the weft becomes longer as it is woven into the waste threads. is a negative factor in weft insertion work. Furthermore, as is clear from the above, since it is necessary to cause the waste yarn to perform a shedding operation, the threading must be threaded into the heddle each time the workpiece is stopped due to breakage or the waste thread breaks, making the operation complicated. It has disadvantages such as:

Means for Solving the Problems and Parrots In order to solve the above-mentioned conventional problems, the present application passes the sacrificial threads on the outside of the warp rows between the reed feathers but does not perform the shedding operation, and It is arranged so that it is slanted upward toward the warp line, and stretched so as to cross the warp line three-dimensionally so that it is caught between the weft and the reed. This device eliminates the drawbacks of the conventional device described above, by providing a curved guide surface at the tip and providing a catch with the bottomed bent edge connected to the guide surface diagonally intersecting the weft. be.

EXAMPLE Next, the present invention will be explained in detail with reference to drawings showing examples.
In the reed, warp threads 3 supplied from a warp supply source (not shown) pass through the healds 1 (threading), pass between the reed feathers 4a, reach the weaving point 5, and are opened by the vertical movement of the healds 1. A weft yarn 7 is inserted into the warp shedding 6 by a jet nozzle (not shown), and this weft yarn 7 is j! It is the same as the conventional method that the woven fabric 8 is woven into the warp threads 3 by the beating operation of step 4.

In the shuttleless loom as described above, the present device is as follows. Reference numeral 9 denotes a waste yarn supplied from a supply source (not shown), and as shown in FIG. It is stretched out. As shown in FIG.
A guide roller 11 installed on the heald frame 2 and a guide roller 12 installed below the warp lines W and L on the upstream side of the heald frame 2 are stretched diagonally so as to cross the warp lines W and L three-dimensionally. The oblique portion constitutes a catching portion 13, and the discarded yarn 9 in this portion passes between the reed feathers 4a, but passes through the space 13 between the heald 1 and the heald frame 2 and is attached to the guide rope 11.
．． 12, and the heald 1 is not threaded, so no opening operation is performed.

Next, the trap 14 will be explained. The catcher 14 is the fourth
As shown in the drawings and FIG. 5, the side surface has a U-shape, and a guide surface 16 curved upward is provided at the tip of the bottom plate 15, and a bent edge 17 of the bottom plate 15 continuous with the guide surface 16 is
It is inclined from the front end side to the rear end side to form a substantially trapezoidal shape, and the distance between the bottom plate 15 and the top plate 18 is small enough to sandwich the waste yarn 9 and the weft yarn 7 as described later. do. The trap 14 configured in this way is attached to the temple 10.
In the thread path of waste thread 9 between and cutter 20.

The cutter 20 is attached so that the attachment position of the cutter 20 and the rear end of the catcher 14 substantially coincide with each other, or are slightly upstream of the rear end. When the catcher 14 is installed in this way, the bottom plate 15
has the above-mentioned shape, and as shown in FIG. The length from the waste thread 9 to the bent edge 17 gradually increases from the leading end to the rear end. In addition, 20 in the figure is a cleaner using suction airflow, and 21
is a waste yarn cutting detection device.

In Fig. 2, weft insertion is performed as shown at 7A in the warp shedding 6, and the weft insertion position is approximately at the same height as the warp lines W and L, and the yarn ends of the weft yarns 7 inserted are captured. Part 1
It is caught on the waste thread 9 of No. 3 and hangs down. Next, the reed beating operation is performed, and while the reed 4, which was at the position shown at the weft insertion end point 4A in FIG. The weft yarn 7 slides up the slope of the section 13 and is successively lifted up above the warp lines W and L between the reed feathers 4a as shown in FIG. Since beating is performed in this state, the quality of the woven fabric 8 is not degraded.

Both the woven fabric 8 woven as described above and the waste yarn 9 that captures the ends of the weft yarns 7 are pulled into a woven fabric winding device and a waste yarn pulling device (both not shown). drawn out,
The warp threads 7 caught by the waste threads 9 move to the installation location of the catcher 14. The weft yarn 7 that has moved to the catcher 4 in this way is first caught between the guide surface 16 and the waste yarn 9 like the weft yarn 7 shown at 7B in FIG. 4, and then folded. It is bent upward by the curved edge 17 and the waste thread 9.

Therefore, the bent edge 17 is oblique as described above,
Since the distance between the waste thread 9 and the bent edge 17 gradually increases toward the rear end, the weft thread 7 is gradually bent into a U-shape on the bottom plate 15 as the waste thread 9 moves, and the weft thread 7 is bent into a U-shape on the bottom plate 15. It is sandwiched between the two (Fig. 5). As the length of the weft threads 7 required for bending gradually increases, the ends of the extra weft threads 7 other than those woven into the woven fabric 8 are pulled by the waste threads 7, and the ends of the weft threads 7 are stretched to an appropriate level. Since tension is applied and the cutter 19 cuts the weft yarn 7 in this state, there is no cutting error and the cutting length is always uniform. It is removed by suction. In the above embodiment, the bottom plate 15 is made into a trapezoidal shape and intersects the weft threads 7 diagonally, but the bottom plate 15 may be made into a rectangular shape and the catcher 14 itself may be attached diagonally. To increase the strength, you can use two pieces of thread 9.

Furthermore, the upper plate 18 of the catcher 14 is provided to ensure reliable operation and is not essential.

Effects of the Invention As described above, the present invention not only makes it possible to significantly reduce waste yarn consumption and reduce weft yarn consumption, but also eliminates weft cutting mistakes compared to conventional weft yarn end processing devices. It eliminates the need for yarn breakage, makes the cutting length uniform, has a simple mechanism, and does not perform shedding operation on the waste yarn, so there are fewer yarn breakages and mechanical troubles, and it satisfies everything desired in a weft end processing device. It is something to do.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is an overall perspective view, FIG. 2 is a partially enlarged side view of FIG. 1, FIG.
The figure is a partially enlarged view of figure 1 with the upper plate of the catcher cut away, and figure 5.
The figure is an explanatory diagram of the action. 1. Healds 3. Warp 4. Reed 7. Weft 9. Waste thread 13
, capture unit 14. Capture device 15. Bottom plate 16. Guide surface 1
7. Bent edge

Claims (1)

[Claims] The waste threads on the outside of the warp row are passed between the reeds but not in a shedding motion, and are tilted upward from the back side to the front side so that they intersect the warp line three-dimensionally. It is stretched to form a weft catching section, and is also positioned between the temple and the cutter and in the thread path of the waste yarn, and is provided with a curved guide surface at the tip, and a bent edge of the bottom plate that is continuous with the guide surface. A weft end processing device for a shuttleless loom, which is provided with a catcher such that it intersects diagonally with the weft.