JPH03185155A - Method for removing knotted ball of weft - Google Patents

Abstract

PURPOSE:To carry out automation of operation for removing knotted balls and improvement of grade of a woven fabric by stopping a loom, based on knotted ball-detecting signals of a sensor inserted between a yarn feed package and a weft-inserting device, automatically removing the above-mentioned knotted balls and then automatically re-starting the loom. CONSTITUTION:When weft 1' drawn from weft feed package 1 is passed through a knotted ball detecting sensor 2 and weft length necessary for once weft inserting is measured by driving a yarn length-measuring roller 4 and a press roller 3 and the weft is stored in a storage device 5 and then weft is inserted in corporation of a holding device 6 opened and closed, synchronized with weft inserting timing and a weft-inserting nozzle 7, the loom is stopped according to a knotted ball detecting signal of the above-mentioned sensor 2. Then a press roller 3 is raised and then rotated reversely to the loom to keep the holding device to opening state and treatment for removing knotted balls is carried out by a operating yarn treating device 8 and then the loom is automatically re-started.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing weft knots. More particularly, the present invention relates to the removal of weft knots from fabrics where the weft knots are a defect.

[Prior Art] Conventionally, technological improvements have been made to feed weft yarns without stopping the loom as much as possible.

In other words, the yarn feeding package to the loom is larger.In addition to synthetic fiber filament yarn, twisted yarn is also twisted using a pigtail and wound around multiple small bobbins, and is supplied as a yarn feeding package weighing several kilograms. be done. For this reason, the operating rate of the loom has improved, but on the other hand, the weft knots are scattered and woven at unspecified locations on the surface of the fabric. The size of the knot differs depending on the type of thread, the knotting method, and the operator, but for example, 75 de
The size of the yarn is 1 to 31111, which is a problem.

Particularly in sewn products, minute defects in textiles become a problem, and are pointed out as defects when the knot is sewn in a region that comes into direct contact with the skin.

[Object of the Invention] The object of the present invention is to solve such problems and to propose a method for providing a woven fabric without weft knots. In the present invention, the knots are automatically removed and the loom This is a method to automatically restart the .

[Structure of the Invention] The present invention provides a weft yarn supplying package and a weft insertion device for weaving of a steelless loom that pulls out a yarn from a weft yarn supplying package and inserts the drawn yarn into a warp opening. A method for removing weft knot distortion is characterized in that a sensor for detecting weft knots is provided between the wefts and the weft knots, and the loom is stopped in response to a detection signal of the weft knots from the sensor.

FIG. 1 is a process diagram showing the steps of carrying out the method of the present invention. In FIG. 1, a 1° weft yarn pulled out from a weft supply package 1 passes through a sensor 2, is measured by a length measuring roller 4 and a press roller 3 to the length required for one weft insertion, and is stored. A gripping device 6 that is stored in the device 5 and then opened and closed according to the timing of the loom, and a weft insertion device (
The warp threads fly through the warp shedding by the nozzle 7, and weft insertion is performed - times. The inserted yarn is cut by a cutter 9 after beating. When a knot is found in the weft, the loom is stopped by a signal from sensor 2. At this time, the cutter 9 does not operate and the weft yarn is not cut even after beating.

Next, the press roller 3 is lifted from the length measuring roller 4 by a solenoid or a cylinder using fluid, and the loom is reversed once. Therefore, the weft yarn that has been beaten without being cut is opened. Then, after fluidly or mechanically passing through the nozzle 7, the knotted ball is taken up by the thread processing device 8. At this time, the press roller 3 is pressed against the length measuring roller 4 and pulls out enough yarn length from the package so that the knots can be removed by the yarn processing device 8. Note that the thread is pulled out by setting a sequencer (not shown). Then press roller 3 again
is lifted, the gripping device 6 is then closed by a solenoid to grip the thread, and the cutter 9 cuts the thread to complete the process. In this state, turn the loom once again in the reverse direction to restore normal operation.

The sensor used in the present invention is installed between the weft feeding bag and the weft inserting device, and the types include those that detect mechanically, those that detect optically, and those that utilize changes in dielectric constant. Detection methods are used.

Specifically, as a mechanical detection device, the one shown in FIG. 2 is exemplified.

FIG. 2 is a longitudinal sectional view showing a mechanical sensor used in the present invention. The weft 1' is brought into contact with the convex part of the support base 21 having a convex part and four parts, and the lever 2 faces the concave part.
Pass it through while applying light pressure with the tip of No. 2. A strain gauge 23 is attached to the lever 22, and if a knot in the weft passes, the tip of the lever is lifted, and the strain gauge 23 senses this and removes the knot in the weft. to catch.

FIG. 3 is a side view showing an optical sensor used in the present invention. In FIG. 3, the weft 1 is passed through a gap between a light projector 2 and a light receiver 3, and a knot in the weft is detected. 4 is a slit for adjusting detection sensitivity.

Among the devices that utilize changes in dielectric constant, knots are detected by passing the weft yarn between electrode plates having slits in which the dielectric constant changes.

The weft knot removal device used in the present invention is exemplified by a suction type device that sucks the knotted portion, and the timing at which the suction is applied is determined by setting the sequencer.

[Effects of the Invention] The method of the present invention provides a means for detecting weft knots between a weft package and a weft nozzle for inserting the weft into the warp, and stops the machine in response to a signal from the detecting means. , after removing the weft inserted into the warp opening with the weft nozzle and the weft between the weft nozzle and the weft package, the operation is restarted, so that the weft knots are removed from the surface of the fabric. This is something that can be done. especially,
In the present invention, these series of operations can be performed automatically, which not only greatly reduces the man-hours required to remove knots from the weft, but also eliminates the presence of knots. We were able to obtain the surface of the fabric.

Note that the method of the present invention is applied to a steelless loom such as a water jet loom, an air jet loom, a gripper loom, etc., which performs weft insertion without passing a means for storing the weft through the opening of the warp. It can be applied.

[Brief explanation of drawings]

Fig. 1 is a process diagram showing the steps of carrying out the method of the present invention, Fig. 2 is a longitudinal sectional view showing a mechanical sensor used in the present invention, and Fig. 3 is a diagram showing an optical sensor used in the present invention. FIG. 1... Weft yarn feeding package 2... Sensor 7... Weft insertion device 8... Yarn processing device

Claims (3)

[Claims] (1) In weaving on a no-thread loom in which yarn is pulled out from a weft supply package and inserted into a warp opening, the weft is tied between the weft supply package and the weft insertion device. A method for removing weft knots, comprising: providing a sensor for detecting weft balls; and stopping a loom in response to a weft knot detection signal from the sensor. (2) According to claim (1), the loom is stopped by a weft knot detection signal from a sensor, and the weft knot is removed by a weft knot removal device. the method of. (3) The loom is stopped by a weft knot detection signal from the sensor, the weft knot removing device removes the weft knot, and then the loom is automatically restarted. 1) or the method described in (2).