JPH08170249A - Method for ending weft in cylindrical woven fabric, device therefor and cylindrical woven fabric - Google Patents

Abstract

PURPOSE: To provide a method for producing high-quality cylindrical woven fabric in high productivity and at low cost, and provide a device useful for the production. CONSTITUTION: In feeding weft 11 from a cop change type shuttle 5 and changing cops, the yarn end of the old cop is held by the shuttle, returned and the old weft and a new weft 20 in fixed length are properly arranged at the returning part to carry out ending of the old and new yarns. This weft ending device in the cylindrical woven fabric has a wire heald controlling means for opening a wire heald to an opening for upper cloth texture and an opening for an under cloth texture, alternately opens the opening for the upper cloth texture and the opening for the lower cloth texture, and successively feeds weft from the cop change type shuttle to each opening. The shuttle is provided with a weft end holding part 14 for taking the yarn end of the old weft in changing the cops and the end yarn holding part of the shuttle is equipped with a supply means for taking the yarn end of the old weft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting weft yarns in a tubular fabric and a tubular fabric.

[0002]

[Prior art]

[0003]

2. Description of the Related Art For example, a dust collecting bag in a large dust collecting apparatus has a tubular woven fabric having one end thereof in the weft direction (weaving width direction).
It is sewn on to form a bag, and this bag is used as a dust bag. The tubular woven fabric used here is a wire heald controlled by a dobby device or the like to alternately open the upper tissue opening and the underlying tissue opening, and to continuously connect the weft from the shuttle to these openings. The tubular fabric is woven by supplying the upper fabric fabric and the ground fabric at both ends in the weaving width direction.

In the conventional weaving of tubular woven fabric, when the weft yarn in the cup stored in the shuttle becomes less than a predetermined amount, a mechanical or phototube type feeler detects it and stops the loom. The operator takes out the shuttle in the shuttle box of the machine frame that stopped and binds the yarn end of the old weft of this shuttle with the yarn end of the new weft of the shuttle inserted in the shuttle box, and then, together with the shuttle, within the opening of the warp. It is common to supply a weft yarn including a portion bound to the.

On the other hand, when the weft of the cup becomes less than a predetermined amount, a mechanical or phototube type feeler detects it, and a new cup is automatically mounted on the shuttle to continuously move the machine base. There are also change-type looms, but in these machines, the connecting parts of the new and old wefts are two long outside the weaving width, and after the tubular fabric is woven, these two There is also one in which wefts are bound together.

However, in such a product, the portion where the yarn ends are bound together bulges like a bump and a gap is created in the vicinity of the bump, so this is used as a dust bag for a large dust collector with high internal pressure. When used, there is a problem in that air leaks or breakage easily occurs from the bump portion. Therefore, in order to prevent air leaks and tears, the weft of the cup is used to the end, the loom is stopped, and the warp ends are aligned with the new weft ends. The shuttle is inserted into the opening, and the loom is restarted so that the tubular fabric is woven.

[0007]

According to the above-mentioned method of connecting the weft threads, the weaving time of the loom is set so that the operator manually inserts a new weft thread after the weaving machine stops due to the weft thread breakage. However, there was a problem that productivity was lowered because of this.

Further, since the weft yarns are spliced manually by the workers, the number of looms for each worker is small and many workers are required. As a result, the labor cost and the manufacturing cost are increased. There was also the problem of being lost.

In addition, the amount of alignment of the new and old wefts in the connecting portion of the weft is not constant because it is performed by the operator's sense, and when the amount of aligning is long, the connecting portion is conspicuous, and the reverse. In the case where the aligned portion is short, there is a problem that air leakage and cracks are likely to occur from this portion. The present invention has been proposed in view of the above problems, high productivity,
It is an object of the present invention to provide a method for producing a tubular woven fabric that is low in cost and excellent in quality, and an apparatus used for the method.

[0010]

In order to achieve the above object, a method for connecting wefts in a tubular woven fabric according to the present invention is
In a tubular woven fabric in which a weft is fed in a state where both ends of the upper design and the base design are connected to each other in the weft width direction, the weft is fed from a cup change type shuttle and at the time of the cup change. It is characterized in that the yarn end of the old cup is folded by the shuttle and folded back, and the old weft of a predetermined length is aligned with the new weft at the folded back portion to perform the new and old thread joining. is there.

Next, the weft thread connecting device in the tubular fabric according to the present invention has a wire heald control means for opening the wire heald into the upper tissue opening and the base tissue opening, and A weaving machine for tubular woven fabric formed by alternately opening the openings for the base fabric and continuously feeding wefts from a cup change type shuttle to each of the openings to continuously woven the tubular woven fabric. In the above, the shuttle is provided with a weft end gripping portion that grips the thread end of the old weft at the time of a cup change, and a supply means for gripping the thread end of the old weft is provided in the shuttle thread end gripping portion of the shuttle. To do.

In the tubular woven fabric according to the present invention, which has a weft yarn connecting portion, the weft supplied from the shuttle is folded back at both end portions in the weft width direction to form a ground fabric. In the connecting part of the new and old wefts of the tubular woven fabric formed in a tubular shape by and the old wefts are folded back to the upper or lower ground texture at the end portion of the weave width for a predetermined length,
The present invention is characterized in that it has a yarn connecting portion along which the folded back old weft ends are fed with new weft yarns.

[0013]

In a loom equipped with wire-held control means such as a dobby machine, the wire-held is operated by the dobby machine so that the upper tissue opening and the underlying tissue opening are alternately opened. When the shuttle travels back and forth through these openings, wefts are continuously fed from the cup, and a tubular woven fabric is woven.

When, for example, a photoelectric tube or a mechanical feeler detects that the shuttle weft amount has decreased and the cup has come to be replaced, the cup is replaced with a new shuttle having a sufficient weft yarn at a predetermined cup change location. To be done. At this time, the yarn end of the old cup that has been exchanged is gripped by the feeding means at the weft end grip of the shuttle, and the yarn end of the new cup is supported on the machine bed side of the loom.

In this state, when the shuttle, which holds the yarn end of the old weft at the weft end gripping portion, runs through the upper texture opening or the base texture opening, the old weft yarn end is folded back and pulled with the new weft yarn. It is supplied in the aligned state to the upper tissue opening or the base tissue opening. When the upper texture opening or the base texture opening through which the shuttle passes is closed in this manner, the yarn end of the old cup forms the upper texture or the base texture together with the yarn end of the new cup.

At this time, the length of the yarn end of the old cup is a predetermined length from the end of the weaving width of the loom to the cup change position.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG.
Is a plan view of a main part showing a schematic configuration of a loom for weaving a tubular fabric, FIG. 2 is a side view thereof, and reference numeral 1 in the drawing denotes the loom as a whole. This tubular fabric weaving machine 1 includes a wire heald 2 for alternately opening an opening for a base tissue and an opening for a top fabric by a dobby device (wire heald control means) not shown, and a cloth heald side of the wire heald 2. The lead 3 that reciprocates back and forth, and the lace 4 on the cloth fell side of the lead 3
The shuttle traveling device 6 for traveling the cup change type shuttle 5 at the upper opening, and the yarn splicing processing means 7 for cutting the old weft yarn at the time of cup change and holding the yarn end on the shuttle 5.

The shuttle traveling device 6 has a picking device 9 (showing only a picker) having a well-known structure in which the shuttle boxes 8 are attached to both ends of the race 4 to which the leads 3 are attached, and the shuttle 5 is driven at the ends of the shuttle box 8. A shuttle changing device (not shown) having a well-known structure is provided above one shuttle box 8.

Further, the yarn splicing processing means 7 detects that the remaining amount in the shuttle 5 has become small by a weft feeler or the like, and the weft yarn of the cup 10 (this is called old weft yarn) 11 at the time of the cup change. A cutter 12 for cutting near the picking device 9 side of the shuttle box 8 and a middle part of the yarn path 13 on the side wall portion of the shuttle 5 for holding the yarn end of the cut old weft 11 as shown in FIG. It is configured by providing a threaded end hole (weft end holed portion) 14 that has been bored, and an injection nozzle 15 that timely injects high-pressure air into the shuttle box 8 portion facing the threaded end hole 14.

The injection nozzle 15 includes a compressor 16 and
A high-pressure air compressed by a compressor 16 is provided with a timing valve 17 that is controlled to open and close in conjunction with the cutter 12, and has a thread end knurling hole (weft thread knurling portion) 14 and this thread end knurling hole. An injection nozzle 15 for timely injecting high-pressure air to the shuttle box 8 portion facing 14 and a compressor 16 and a timing valve 17 provide a supply means 25 for supplying the yarn end of the old weft 11 to the yarn end biting hole 14. Has been formed.

Reference numeral 18 in FIG. 3 is a cutter insertion recess provided in the side surface of the shuttle 5, and the yarn end of the portion cut by the cutter 12 is lightly held in the cutter insertion recess 18. Thread end holder 2 made of rabbit hair
2 and a cushion member 23 for protecting the cutting edge of the cutter 12 are attached, and reference numeral 19 is a feeler insertion hole.

The tubular weaving machine 1 for a tubular fabric constructed as described above.
The action of will be described below. The wire heald 2 is operated by the wire heald control means such as a dobby device to open the upper tissue opening and the underlying tissue opening alternately. When the shuttle 5 struck by the picking device 9 into these openings alternately travels between the upper tissue opening and the underlying tissue opening opened in front of the lead 3, the shuttle 5 moves from the cup 10 of the shuttle 5 to the weft yarn. 11 are continuously fed,
A tubular fabric is woven.

When a feeler (not shown) detects from the feeler insertion hole 19 that the weft amount of the cup 10 in the shuttle 5 has decreased and the cup 10 has come to be replaced, the cup change is made based on this. The device operates, but prior to the operation of this cup change device,
Or, as the cup changer is operated, the cutter 12 is moved to the cutter insertion recess 18 as shown in FIGS.
The old weft 11 derived from the cup 10 that has advanced to and is exchanged with is cut.

At the same time, the timing valve 17 is opened and high-pressure air from the compressor 16 is blown into the yarn end hole 14 from the injection nozzle 15. Therefore, along with this blown air, the yarn end of the cut old weft yarn 11 is cut off. Is the thread end hole 1
It is inserted into the shuttle 5 from 4 and is in a state of being caught. After that, a new cup 20 having a weft yarn (this is called a new weft yarn) 20 whose yarn end is held on the machine base by the operation of the cup change device is attached to the shuttle 5, and has been attached to the shuttle 5 until now. Old cup (old cup) 10
Is extruded below the shuttle 5 (see FIG. 6).

When the shuttle 5 thus replaced with the new cup 21 is struck by the picking device 9 into the upper texture opening or the base texture opening, the old weft 11 is pierced at its thread end into the thread end knurling hole 14. Therefore, it is folded back into the opening and gradually pulled out from the yarn end hole 14 and travels through the opening while feeding out the new weft 20 from the shuttle 5, as shown in FIG. 20
And are aligned.

In this way, when the upper texture opening or the underlying texture opening through which the shuttle 5 passes is closed, the old weft 11
And the weft yarn 20 of the new cup 21 form the upper design or the base design. At this time, the length of the yarn end of the old weft 11 becomes a predetermined length from the end of the weaving width of the loom to the cup change position.

In the above embodiment, the old weft 11 is cut by the cutter 12, but the present invention is not limited to this, and needless to say, scissors and other cutting devices can be used. is there.

[0028]

As described above, according to the present invention, the weft yarn is fed from the cup change type shuttle into the opening opened and closed by the wire-held control means, and the upper fabric and the base fabric are arranged in the weft width direction. In a tubular woven fabric woven with both ends connected, when the cup is changed, the yarn end of the old cup is held by the shuttle and folded back, and the old weft of a predetermined length is aligned with the new weft at the folded portion. Since the new and old yarn splicing is performed, it is possible to continuously operate the loom when the new and old yarn is spliced, thus improving the operating time and productivity. Has the advantage that it can be significantly improved.

Further, since the new and old thread joining is automatically performed without bothering the operator, the number of looms for one operator can be increased, the number of operators can be reduced, and the labor cost can be reduced. It is also possible to reduce the manufacturing cost and the manufacturing cost.

In addition, since the new and old weft splicing is automatically performed, the alignment amount of the new and old wefts in the weft splicing portion is always constant without excess or deficiency, and the quality is deteriorated due to misalignment. In addition to being eliminated, there is an advantage that a tubular woven fabric for bag filters, which is excellent in durability without air leakage and cracks, can be woven.

[Brief description of drawings]

FIG. 1 is a plan view of a main part showing a schematic configuration of a loom for weaving a tubular fabric.

FIG. 2 is a side view of an essential part showing a schematic configuration of a loom that weaves a tubular woven fabric.

FIG. 3 is a side view of a shuttle used in a loom for weaving a tubular fabric.

FIG. 4 is a side view of the shuttle when cutting the old weft.

FIG. 5 is a plan view of the shuttle when cutting the old weft.

FIG. 6 is a plan view of the shuttle with a cup changed.

FIG. 7 is a plan view of the shuttle that travels after the cup is changed.

[Explanation of symbols]

 1 ... Loom 5 ... Shuttle 11 ... Weft (old weft) 14 ... Position and edge part 20 ... New weft 25 ... Supplying means

Claims (3)

[Claims] 1. A tubular woven fabric comprising a top design and a base design in which both ends in the weaving width direction are connected to each other, and a weft is fed from a cup change type shuttle. At the time of the cup change, the yarn end of the old cup is hooked by the shuttle and folded back, and the old weft of a predetermined length is aligned with the new weft at the folded back portion so that the new and old weft splicing is performed. A method for connecting weft threads in a characteristic tubular fabric. 2. A wire-held control means for opening the wire heald to the upper tissue opening and the underlying tissue opening, wherein the upper tissue opening and the underlying tissue opening are alternately opened, and each of the openings is opened. Is a weaving machine for tubular woven fabrics that is formed by continuously feeding wefts from a cup change type shuttle and weaving tubular woven fabrics continuously. A weft splicing device for a tubular woven fabric, characterized in that a weft end gripping part is provided on the shuttle, and a supply means for gripping the thread end of the old weft is provided on the shuttle end part of the shuttle. 3. A weft yarn supplied from a shuttle is folded back at both ends in the weaving width direction, and in a connecting portion of new and old weft yarns of a tubular woven fabric formed into a tubular shape with a ground texture as an upper fabric texture, A tube having an old weft folded back to a predetermined upper or lower ground structure at an end portion of the weaving width by a predetermined length and having a yarn connecting portion in which a new weft is fed along the folded back weft end. Woven fabric.