JPH0892846A - Production of woven fabric free from distortion and twist direction error-detecting device used therefor - Google Patents

Abstract

PURPOSE: To provide a method for producing a distortion-free woven fabric by using a loom provided with plural series of weft-feeding devices, and further to provide a twist direction error-detecting device used therefor. CONSTITUTION: A spiral guide 4 is formed in a spiral form different from the rotation direction of a yarn when unwound from a raw yarn, pirn 6 and is spirally expanded, while forming a space 4a allowing the passage of the yarn 1. A yarn-detecting sensor 5 for detecting the passage of the yarn is disposed at the space part 4a of the spiral guide. When a yarn different in the twist direction is set, the yarn-detecting sensor 5 can thereby be operated by the rotation of the unwound yarn to surely detect the difference in the twist.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of weaving a woven fabric having no twist using a loom equipped with a plurality of series of weft feeders and a twisting direction error detecting device used for the method.

[0002]

2. Description of the Related Art A twist-free woven fabric is used, for example, as a reinforcing material for a printed circuit board, and various methods for weaving this twist-free woven fabric have been proposed. As a typical example thereof, a weaving method in which weft yarns having different twist directions are woven alternately or in an appropriate combination is known. By alternately driving the weft yarns having different twisting directions, the twisting force between the woven yarns is canceled out, and a twist-free woven fabric is obtained. Therefore, in order to weave such a woven fabric, a multi-color weft inserting loom equipped with a plurality of series of weft feeders is used, and the S-twisted yarn and the Z-twisted yarn are arranged according to the order in which the wefts are driven into each weft feeder. Were set alternately.

[0003]

However, in such a case, if the original fiber pun for the weft is mistaken and the twisted yarns in the same direction are set and weaved, the desired woven fabric without twist cannot be obtained. In particular, the twist cannot be identified only by looking at the appearance of the original fiber bun, and since it is necessary to see the indication of a small label inserted inside the bun, it is easy to make an error in the set. Moreover, even if the original weft pirn for the weft yarn is set by mistake, there is no device for detecting this, and if the mistaken detection is delayed, defective products will continue to be woven.

Further, even if weaving is mistaken, it is impossible to distinguish a regular product from a defective product only by looking at the appearance, and if a defective product is generated, it is impossible to use the entire amount of one product (2,000 m). The present invention has been made in view of the above-mentioned problems of the prior art, and provides a twist direction misunderstanding detection device that can reliably detect even if weft yarns having different twist directions are set by mistake, and twist It is an object of the present invention to provide a weaving method for a woven fabric that does not have a woven fabric.

[0005]

In order to achieve this object, the twist direction error detection device is formed in a rotation direction different from the rotation direction of the yarn at the time of unwinding from the original fiber pan, and a gap through which the yarn can pass. It is composed of a spiral guide that spreads out in a spiral shape substantially horizontally while leaving a space, and a yarn detection sensor that detects a yarn passing through a gap portion of the guide.

Further, a method of weaving a woven fabric with no twist uses a loom equipped with a plurality of series of weft yarn feeders, and
A spiral guide that is formed in a rotation direction different from the rotation direction of the yarn at the time of unwinding from the original fiber pan and that spreads in a substantially horizontal spiral shape while leaving a gap through which the yarn can pass, and a yarn detection sensor in the guide gap portion. It is achieved by providing and alternately weaving S-twisted yarns and Z-twisted yarns.

[0007]

The twisting direction error detecting device constructed as described above is provided in each yarn feeding portion of a loom equipped with a plurality of series of weft yarn feeding devices, and a detecting device for S twist according to the weft driving order,
When the Z twist detectors are set and the original fiber pun having the twist direction corresponding to each yarn feeder is set and the loom is operated, the yarns are opposite to the spiral direction of the guide of the set detector. Since the yarn is unwound from the pan while being rotated in the direction, the yarn does not enter the gap portion of the guide, and the yarn detection sensor does not operate.

However, if a yarn having a twist different from the corresponding twist direction is set, the rotation of the yarn at the time of unwinding coincides with the spiral direction of the guide of the detection device. When the yarn is unwound and starts to rotate in a ballooning manner, the yarn advances into the gap along the spiral direction of the guide, activates the yarn detection sensor, and detects that the yarn in the wrong twist direction is set. I can tell you for sure.
Therefore, it is possible to prevent an artificial weft setting error.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an explanatory view in which the twisting direction error detection device according to the present invention is provided in the original fiber pan unwinding part of the weft yarn feeding part of the loom. FIG. 2 shows a plan view of the detection device. In these figures,
Reference numeral 1 denotes a weft yarn unwound from the original fiber pan 6, for example, in a water jet loom, it passes through a tension adjusting device (not shown), and then the length of one weft yarn is determined by a length measuring drum and a pressing roller. It is stored in a pool pipe by air suction, enters a jet nozzle through a gripping device and a guide at appropriate times, and merges with jet water to fly at the warp yarn opening timing.

A known guide 3 for horizontally guiding the weft 1 unwound in the vertical direction is a yarn guide for converging and guiding the weft 1 in the ballooning state unwound from the original fiber pan 6. 10 is a twisting direction error detection device according to the present invention, which is provided between the original fiber pan 6 and the yarn guide 3 on the vertical line, and is unwound from the original fiber pan of the weft yarn having the twisting direction to be set. A yarn detection guide 4 (hereinafter referred to as a "spiral guide") that expands in a spiral shape with a gap that allows the thread to pass in a rotation direction different from the rotation direction of the yarn at that time.
And a yarn detection sensor 5 for detecting passage of the yarn is provided in the gap portion 4a of the guide 4.

The shape of this spiral guide is preferably circular in consideration of giving a uniform unwinding resistance to the yarn, and since the spiral can function even if it is wound approximately once, the number of windings greater than that is required. It suffices if the yarns have a dimension that allows the yarn to pass smoothly without resistance, that is, the gap between the lines that expands in appearance as it swirls. Further, this spiral shape may be formed on a flat surface, but the ends thereof may be in a somewhat vertical position as the spiral shape is formed. The material of the spiral guide 4 is not particularly limited, but it is preferable to use a material coated with titanium or the like, which has excellent piano resistance and abrasion resistance. Further, the yarn detection sensor 5 uses a limit switch that operates with a force weaker than the rotational force of the yarn when unwound from the pan. Incidentally, not only this limit switch but also a photoelectric switch or the like may be used.

Used for each yarn feeding section of the wrong twisting direction weaving machine having the above construction, the S twisting detecting device and the Z twisting detecting device are set in the order in which the S twisting yarn and the Z twisting yarn are alternately driven. . Then, when a raw fiber pun having a twist direction corresponding to each yarn feeder is prepared and the loom is operated,
Since the yarn is unwound from the pan while rotating in the direction opposite to the spiral direction of the spiral guide of the set detection device, the yarn does not enter the gap of the spiral guide and the yarn detection sensor does not operate. . Therefore, since the correctly set S twist yarn and Z twist weft yarn are alternately driven,
After weaving, the twisting force between the yarns with different twists is canceled out,
It is possible to obtain a twist-free woven fabric. On the other hand, when a yarn having a twist different from the corresponding twist direction is set, the rotation of the yarn at the time of unwinding coincides with the spiral direction of the spiral guide of the detection device. When the yarn is unwound and starts to rotate in a ballooning manner, the yarn advances into the gap 4a along the spiral direction of the spiral guide, operates the yarn detection sensor, and stops the loom. Further, it is possible to surely inform that the yarn in the wrong twist direction is set by connecting it to a known alarm device.

Therefore, even if the yarn is set by mistake, it will be known immediately after the weaving machine is started, so that weaving will never be continued by mistake. For this reason, although weaving by mistake cannot be understood as it is, there is no problem that it becomes apparent in a later step, for example, when a prepreg is used.

[0014]

As described in detail above, the twisting direction error detection device according to the present invention is focused on the fact that the rotation direction of the yarn when unwinding is different depending on the twisting direction of the yarn, and the twisting direction to be set. If you set a different thread from the one that has the thread, the thread will be dislocated from the spiral guide along the rotation direction of that thread.
Since the yarn detection sensor for detecting the dislodged yarn is provided, it is possible to reliably detect the presence / absence of yarns having different twists with a simple and inexpensive device.

If this twisting direction error detecting device is used for each yarn feeding portion of a loom equipped with a plurality of series of weft yarn feeding devices, S-twisted yarns and Z-twisted yarns are set in the order in which they are alternately sewn. Since the set of weft yarns with different twist directions can be found immediately, weft yarns are always woven alternately in the correct order, and it is possible to reliably and reliably fabricate a twist-free fabric.

[Brief description of drawings]

FIG. 1 is an explanatory diagram in which the twist direction error detection device of the embodiment is used in a weft yarn feeding section of a loom.

FIG. 2 is a plan view of the twist direction error detection device of FIG.

[Explanation of symbols]

 1 Weft 4 Spiral guide 4a Gap 5 Limit switch 6 Raw fiber PAN

Claims (2)

[Claims] 1. A spiral guide, which is formed in a rotation direction different from the rotation direction of the yarn when unwound from the original fiber bun, and which spreads substantially horizontally in a spiral shape while leaving a gap through which the yarn can pass, and a gap between the guides. A twisting direction error detecting device comprising a yarn detecting sensor for detecting a yarn passing through the portion. 2. A loom equipped with a plurality of series of weft yarn feeders is used, and the yarns formed in a rotation direction different from the rotation direction of the yarns at the time of unwinding can pass through each yarn supply device. A spiral guide that spreads out in a substantially horizontal spiral shape while leaving a gap, and a yarn detection sensor is provided in this guide gap portion, and S-twist yarns and Z-twist weft yarns are alternately woven and weaving-free. Weaving methods for textiles.