JPS6245756A - Production of glass fiber fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing glass fiber fabric in which yarn feeding bobbins are automatically switched in an air jet loom.

[Conventional technology]

The air jet ma weft insertion method uses 5 length measuring devices.
The length of the weft thread is measured and stored in a storage device, and the weft thread is driven between the open warp threads by an air jet from an air jet nozzle. The inserted weft yarns are drawn to the fabric front by the reeds, forming a woven fabric.

Conventionally, when switching the yarn feeding bobbin that supplies the weft yarn.

When the yarn feeding bobbin in use becomes empty, the loom is stopped and manually replaced with a new yarn feeding bobbin, and when the switching is completed, the loom is restarted manually. For this purpose,
For high-speed looms such as air-gage looms.

Stops caused by switching yarn feeding bobbins are the biggest cause of lower operating rates and are also the biggest cause of labor intensiveness.

As a method to prevent a decrease in operating rate due to the loom stopping when switching the yarn feeding bobbin, in the case of synthetic fibers, the tail end of the yarn feeding bobbin is tied to the tip of a new yarn feeding bobbin, so that five consecutive weft insertions can be carried out. A method is being taken to do so. This method can be adopted in the case of synthetic fibers because the yarns can be tied and the knots are small, so even if they are woven into a fabric, there will be no quality problem.

However, when applying this method to glass fibers.

The following problem arises. In other words, glass fibers have extremely low knot strength, so they cannot be tied or connected.

The two threads must be overlapped and glued together, which results in a large seam. If such a seam is woven into the glass fiber fabric, it becomes a protruding flaw, which poses a problem. In particular, when glass fiber fabric is used as a base material for printed wiring, even extremely small flaws can cause problems.
For example, when press-molding a printed circuit board, it damages the copper foil and causes the disconnection of two circuits. from now on.

As printed wiring boards become more multi-layered and more dense, these minute protruding defects become an increasingly serious problem.

In the manufacturing method of glass fiber fabrics, a method for preventing weft seams from being woven into the fabric was published in the Japanese Patent Publication No. 6゜-14.
No. 137 (Glass cloth manufacturing method that does not incorporate weft joints) is proposed. This proposal involves driving a weft yarn with a seam between the warp yarns, which are stopped in the opened state, with the gripper left open, and then suctioning the weft yarn with a suction pipe installed on the opposite side. This is a method to eliminate

[Problem that the invention seeks to solve]

However, in the method disclosed in the above-mentioned publication, since the warp threads run between open seams, there is a problem that the warp threads may get caught in the air guide or the sub-nozzle portion during this running.

It has also been found that the following problem occurs due to the weft suctioned into the suction pipe for seam removal. That is, as shown in FIG. 6, a portion 31A of the weft yarn 31 whose seam has been suctioned by the suction pipe 30, which is inserted between the warp yarns 32, is pressed against the loom by the reed 33 to form a woven fabric after restarting the operation. Therefore, the weft threads sucked into the suction pipe 30 are kept connected to the fabric part and remain sucked into the suction pipe for a considerable period of time. For this reason, the weft yarns that are driven one after another after restarting the operation collide with the remaining yarns in the suction pipe, and the suction force of the suction pipe decreases, resulting in defects in the weft direction such as loosening of the weft. Sign.

In addition, in a loom in which the weft yarn end is caught by the catch cord 34 and cut by the cutter 35 for weft yarn end processing, the weft yarn 31 sucked into the suction pipe 30 is also caught by the catch cord 34. There is also a problem that after the weft 31 is cut by the cutter 35, the weft 31 in the suction pipe 30 is pulled out as the catch cord 34 is pulled. In addition, in FIG. 6, 36 is an air guide, and 37 is a yarn end processing device.

Furthermore, in conventional looms, immediately after restarting operation, the first weft 31
There is also the problem that the reed that presses A against the weave is not necessarily accelerated to a predetermined speed, so the pressing force by the reed is insufficient and a weaving step (crossing step) may occur.

The present invention has been made in view of these problems.

To provide a method for manufacturing a glass fiber fabric, which can automatically switch yarn feeding bobbins without weaving weft seams and produce a glass fiber fabric with fewer weaving defects such as loose wefts and mating steps. purpose.

[Means for solving problems]

The present invention, which has been made to achieve the above object, weaves a glass fiber fabric by using a yarn pulled out from a bobbin wound with a glass fiber yarn in a tail end state as a weft, and using an air jet to weave the yarn between the open warp yarns of the glass fiber. In an air jet loom, the loom is stopped with the warp open before the weft seam is woven.

Opening the gripper for gripping the weft yarn, suctioning the weft yarn using a suction device disposed between the nozzle for inserting the weft yarn and the warp yarn to remove the seam by suction, and then starting the operation of the loom. A method for producing glass fiber fabric characterized by:

[Effect]

Since the present invention has the above configuration, the joint of the weft threads is
The warp threads do not pass between the open warp threads at all, and are removed by suction "AH" between the air jet nozzle and the warp threads.For this reason, as in the past, the warp threads are removed by suction pipe placed on the opposite side of the air jet nozzle. Since the problems that occurred during suction removal have been solved and the seams have been removed, glass fiber fabrics can be manufactured without weaving seams.

〔Example〕

The present invention will be explained in more detail below with reference to an embodiment shown in one drawing.

In FIGS. 1 and 2, 21 is a yarn feeding bobbin in use.

2 is the yarn feeding bobbin that will be used next time, and 3 is the seam connecting the tail end of yarn feeding bobbin 1 and the tip of yarn feeding bobbin 2.

4 is a yarn guide, 5 is a length measuring device, 6 is a storage tube, 7 is a weft holding plate, 8 is a gripper, 19 is an air jet nozzle, 10 is a reed, 1) is a reed stand, 12 is an air guide, 13. 1
4 is a cutter, 15 is a suction pipe, 16 is a weft thread,
17 is a warp, and 18 is a fabric portion. Among these parts, except for the length measuring device 5, one that is commonly used can be used, so the explanation will be omitted.

The length measuring device 5 includes a length measuring drum 20. Lower feed roller 21
, upper feed roller 22. It has a length measuring roller 23.

The upper r-troller 22 measures the length of the weft yarn on its circumferential surface and sends it out. It is provided to be moved by a length measuring lever (not shown), and is driven by contacting the lower feed roller 21. It is movable to a lowered position, an intermediate position where it can rotate freely without contacting the lower feed roller 21 and the length measuring roller 23, and an elevated position where it is driven by contacting the upper length measuring roller 23. The length measuring drum 20 is driven by the main shaft (not shown) of the loom, and the length measuring roller 23
is connected to a drive source separate from the loom.

At the yarn feeding bobbin 1.2, a detection means 242, such as a drawstring bar, is arranged to detect movement of the seam 3. In addition, a suction device 2 is installed between the air jet nozzle 9, which drives the weft yarn between open warp yarns, and the warp yarn 17, at a position where the weft yarn 16 driven between the warp yarns 17 can be sucked.
5 is disposed, and a cutter 26 is disposed between the suction device 25 and the air jet nozzle 9 for cutting the weft located between the two.

Next, the weaving operation will be explained.

The yarn coming out of the yarn supply bobbin 1 passes through the yarn guide 4.

The length of one weft insertion is measured by the upper feed roller 22 of the length measuring device 5. At this time, the upper feed roller 22 is in contact with the lower feed roller 21.

It is driven by a length measuring drum 20. The measured weft yarn 16 is stored in the storage tube 6 and held by the holding plate 7.

At this time, the gripper 8 is closed and grips the weft.

Then the gripper 8 opens and releases the weft thread 16.

The air jet from the air jet nozzle 9 causes the weft yarn 16 to
is driven between the open warp threads 17. Hammered weft 1
6 is drawn to the fabric front by the reed 10, and the fabric is woven. The above operations are automatically performed in synchronization with the rotation of the main shaft of the loom.

While the fabric is being woven as described above, the yarn in the yarn feeding bobbin 1 runs out, and it becomes necessary to switch to a new yarn feeding bobbin 2. The bobbin switching operation according to the present invention will be described below with reference to the operation diagram shown in FIG. Incidentally, FIG. 5 is an example showing a blank firing start method.

(1) Weft connection During weaving using the yarn of the yarn feeding bobbin 1, the tail end of the yarn feeding bobbin 1 and the tip of the next yarn feeding bobbin 2 are connected by a seam 3. A detection means 24 is arranged to generate a detection signal when the seam moves.

(2) Joint movement detection As weaving progresses, the yarn supply bobbin L becomes empty.

Seam 3 is pulled and moved. The detection means 24 detects this movement.

(3) After the detection signal is generated from the loom stop detection means 24, the loom stops with the warp threads 17 opened (at a position where the crank angle is approximately 180 degrees), and at the same time the storage pipe 6 and the suction pipe 15
The blower for use will also stop. In this state, the gripper 8 is in an open state, and the weft threads 16 are driven between the open warp threads 17.

(4) Air jet nozzle 9 stops The blower also stops at the same time as the loom stops, but since air remains due to the rotation of the blower due to inertia, if the air supply to the air jet nozzle 9 is stopped at the same time as the loom stops, the glyph bar will also stop. Since it is open, the weft yarn 16 passing through the air jet nozzle 9 comes out in the direction of the storage tube 6. To prevent this, the air jet nozzle 9 is stopped with a slight delay from the loom and blower stops.

(5) Suction device start The suction device 25 starts operating. This suction device 25 sucks the weft yarn 16 extending between the air jet nozzle 9 and the warp yarns 17, and also suctions and removes the weft yarn 16 inserted between the open warp yarns 17.

(6) Upper feed roller rotation start With the length measuring roller 23 rotating, the length measuring lever holding the upper feed roller 22 rises, and the upper feed roller 22
is brought into contact with the length measuring roller 23.

As a result, the upper feed roller 22 starts rotating.

At the same time as the weft is sent out, air is blown to the air jet nozzle and the blower is also started. By this operation, the weft yarn in the portion having the seam 3 is sent out and removed by suction by the sacsidine device.

(7) Upper feed roller rotation stops After the upper feed roller has rotated for a certain period of time, the length measuring lever moves down one step.
The upper feed roller 22 separates from the length measuring roller and stops rotating, thereby stopping feeding out the L1 yarn. At the same time, the blower also stopped, and after the blower stopped.

Air to the air jet nozzle 9 also stops after a slight delay. Here, the rotation time of the upper feed roller is 4t! It is preset so that the time required for the seam 3 to be removed by the suction device is longer than that required. Note that the suction device 25 may be provided with a means for detecting passage of the seam 3, and upon detecting that the seam 3 has reached the suction device 25, the rotation of the upper foot roller may be stopped.

(8) Processing cutter operation The processing cutter 26 operates to cut the weft near the entrance of the suction device 25. After that, the suction device 2
5 stops.

(9) Reversal of the loom The loom slowly reverses from the stop position of 180 degrees in crank angle through 0 degrees to the approximately 330 degree position of the previous cycle. At this time, the first winding section and the warp beam sending section are also reversely rotated in conjunction with each other. The length measuring drum 20 also rotates in reverse, but since the upper feed roller 22 is at the intermediate position, it does not rotate nine times and the weft does not move.

At a crank angle of 330 degrees, the warp threads are slightly opened,
The gripper is located slightly before the reed 10 contacts the fabric.
8 is in a state where it is closed and the weft 16 is gripped.

α groan Upper feed roller 22 starts rotating. The length measuring lever rises and brings the upper feed roller 22 into contact with the rotating length measuring roller 23. At the same time, the blower starts. Through this operation, the amount of weft required for weft insertion at the start of the loom is measured and stored in the storage tube 6 and the holding plate 7.

αυ Upper feed roller lowered by 2 steps After the length measurement by the upper feed roller 22 is completed.

The length measuring lever lowers the upper feed roller 22 to the lowest position and contacts the lower feed roller 21.

At the same time, the rotation of the length measuring roller 23 is stopped due to 0 or more.

Preparations for starting the loom are completed.

Beating The loom starts rotating in the forward direction from a position where the loom start crank angle is 330 degrees. Between the crank angle of 330 degrees and 360 degrees (0 degrees of the next cycle), the reed 10 lightly beats the weft threads that had already been drawn to a predetermined position on the cloth front by the weaving operation before the V8 machine stopped. The normal driving operation starts from 0 degrees.

The above-mentioned series of operations from (2) to tapping are electrically controlled and automatically and continuously performed, and the yarn feeding bobbin is switched when the machine stops for about 30 seconds.

In the above embodiment, the loom is restarted after the loom is reversed to a crank angle of 330 degrees.

The regular operation of shedding, weft insertion, and beating is underway. For this reason, the weft yarns inserted after restarting are also reeded at the regular speed, and even in the case of glass fiber fabrics where it is easy to enter the first interlocking step in one weave, it is difficult to obtain a good woven fabric. can.

In the case of glass fiber fabrics that do not require very strict requirements regarding the presence or absence of mating stages, there is no need to reverse the loom and perform dry beating of the reed when restarting the loom. In that case, after suctioning and removing the seam 3 with the suction device 25, insert one weft yarn between the open warp yarns 17, and then
It is also possible to start operation in the forward rotation direction of the machine.

The method of the present invention can be applied to any weaving method using an air jet, for example, as a weft length measurement and storage method.

A system using a storage drum may be used, and the weft insertion method is not limited to a system using an air guide (closed air guide) 12 as shown in Fig. 3, but also a method using a modified reed 1 as shown in Fig. 4.
A combination system of 0A and the safrizzle 28 may also be used.

〔Effect of the invention〕

As explained above, according to the method of the present invention, the sewing machine 2
5, the weft is suctioned and the seam is removed by suction, which is different from the method in which the seam 3 is inserted between the open warp yarns 17 and removed by an air jet using the air jet nozzle 9 or the air jet nozzle 9 plus the sub nozzle 28. There is no need to insert the seam 3 into the weft, and the problem of the seam 3 getting caught on the opened warp threads 17, the air guide 12, the sub-nozzle 28, etc. does not occur.

In addition, since the method is not to insert the weft at the weft seam 3 and remove the seam 3 by suction using the suction pipe 15, the weft yarn that has been suctioned and removed remains in the suction pipe for a relatively long time. There is no adverse effect on the saxilan effect, and there is no problem of weft defects such as weft loosening.

Furthermore, in the present invention, the weft inserted between the warp yarns when the loom is stopped is removed by the suction device, so when the loom is restarted, the loom can be slightly reversed to start the blank beating, and the weft can be directly inserted by inserting the weft yarn. Any of the methods of starting in the forward direction can be selected, and by appropriately selecting the above method depending on the type of glass fiber fabric being woven, it is possible to manufacture a glass fiber fabric with fewer 9-ply rows. be.

In this manner, the present invention has made it possible to completely automate the switching of the yarn feeding bobbin and save labor while preventing various troubles caused by the katak seams.

[Brief explanation of drawings]

FIG. 1 is a perspective view schematically showing the main parts of a V& machine used for carrying out the method of the present invention. Figure 2 is a plan view of the same. FIG. 3 is a side view showing the positional relationship between the open warp threads and the air guide in the above-mentioned loom. FIG. 4 is a side view of the same part as in FIG. 3 of a different type of loom from that shown in FIG. 3. FIG. 5 is an operational diagram showing the operational procedure in an embodiment of the method of the present invention. FIG. 6 is an explanatory diagram of a conventional example. 1.2 - Yarn feeding bobbin 3 - Seam 5 - Length measuring device 6 - Storage tube 7 - Holding plate 8 - Gripper
9...-Air jet nozzle 10...-Reed 1G-
- Weft 17 - Warp 2 - Length measuring drum 21 - Lower feed roller 22 - Upper feed roller 23 - Length measuring roller 24 - Detection means 25 - Suction device 26 - Cutter

Claims (3)

[Claims] (1) In an air jet loom that weaves a glass fiber fabric, the yarn pulled out from the bobbin on which the glass fiber yarn in the tail end state is wound is used as the weft, and is inserted between the warps of the open glass fibers using an air jet. Before the seam is woven, the loom is stopped with the warp threads open, a gripper for gripping the weft threads is released, and the weft threads are sucked by a suction device disposed between a nozzle for inserting the weft threads and the warp threads. A method for manufacturing a glass fiber fabric, characterized in that the seams are removed by suction, and then the operation of the loom is started. (2) When the seam is removed by suction and the loom is then started to operate, the loom is first reversed to a predetermined crank angle and then operated in the forward rotation direction. A method for producing a glass fiber fabric according to item 1. (3) A patent characterized in that after the seam is removed by suction, when the loom is started to operate, one weft is inserted between the warp threads that are open when the loom is stopped, and then the loom is started. A method for manufacturing a glass fiber fabric according to claim 1.