JPH0685385U - Automatic weft repair device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent weaving of defective parts such as yarn unevenness and knots in the fabric during weaving by an air jet loom. [Structure] An automatic weft repair provided on a loom configured such that a weft 2 fed from a yarn supply package 1 is measured by a length measuring device 3 for each weaving width, and is jetted by a nozzle 5 to pass through a shed. In the device 11, when the defective portion of the weft yarn 2 passes through the proper position between the yarn supplying package 1 and the length measuring device 3, the sensors 12A, 12B detect it and the control device 17 determines the information based on the information. An operation command is issued to the weft path breaker 13 so that the weft path breaker blocks the weft path of the weft yarn 2 which is made to fly from the nozzle 13 to prevent the defective yarn from being supplied to the shed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic weft repair device which is provided on a loom such as an air jet loom and removes a defective weft yarn having defects such as yarn unevenness and a knot when the weft yarn is supplied to prevent it from being woven into a woven fabric. It is a thing.

[0002]

[Prior art]

 The air jet loom is designed to automatically stop the machine base and automatically process the defective yarn when the weft is not correctly driven due to thread breakage or thread clogging when weft is driven. When supplied, weaving was continued as it is as long as it was normally driven. If there are yarn defects in the fabric, the commercial value of the fabric will be low. Therefore, after weaving, it is inspected whether or not the product has a defect in the yarn, and if there is a defect, it is sent to another repair process, and the defective weft yarn in question is taken out and repaired. It was

[0003]

[Problems to be solved by the device]

 This repair work is quite troublesome, but it was not a big problem as long as the number of defects was small. However, with the rapid increase in the number of single-ply yarns and strong-twisted fabrics, many yarn breakages occurred in the raw yarn manufacturing process, and many defective weft yarns that had defects in the weaving process were supplied. This caused a large amount of cloth blurring, and the repair work for the defect itself or the texture blurring increased, which was a major problem. Moreover, even if repairs were performed, they would not be exactly the same as the normally woven parts, which had a negative effect on the quality. Therefore, the present invention has been made under such a background, and the defective wefts supplied to the weft driving part of an air jet loom or the like are automatically removed, and defective defective wefts are formed in the fabric. The challenge is not to be woven.

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, according to the present invention, an automatic weft yarn provided on a loom configured such that a weft yarn fed from a yarn supplying package is measured by a length measuring device for each weft width, and is jetted by a nozzle to pass through a shed. A repair device, a sensor for detecting a defect of a weft thread passing through a proper place between the yarn supplying package and the length measuring device, and a weft path capable of interrupting a weft path of a weft thread which is jetted from the nozzle. It is characterized by comprising a blocking device and a control device for stopping the weaving machine when the sensor detects a defect and operating the weft path blocking device to block the weft path.

[0005]

[Action]

 If a weft having a defect such as a knot is supplied, the sensor detects this and the output command of the control device issued based on the detection information causes the weaving machine to stop and stop the weft path. The breaker is activated. For this reason, the course of the weft flying from the nozzle is blocked, and the weft is not driven into the shed. Therefore, weaving of yarn defects into the product is prevented.

[0006]

【Example】

 FIG. 1 is a perspective view of a weft supplying portion of an air jet loom according to an embodiment of the present invention. The weft yarn 2 supplied from the yarn feeding package 1 is guided to the main nozzle 5 via a rotary drum type accumulator 3 which is a weft yarn length measuring device. The weft yarn 2 is measured by the accumulator 3 for one pick and is temporarily stored in the accumulator. Then, in synchronization with the operation of the heddle 7, the reed 8, etc., the weft yarn 2 stored in the accumulator 3 is caused to fly together with the air from the main nozzle 5 toward the shed, and the weft yarn is driven.

The weft supply unit is provided with an automatic weft repair device 11 that automatically processes when a yarn breakage or a defective weft is supplied. The automatic weft repair device 11 includes defective weft detection sensors 12A and 12B, a weft cutter 13, a weft path breaker 14, a blowing nozzle 15, a suction duct 16, a controller 17 and the like.

The defective weft detection sensors 12A and 12B are provided with a projector 20 and a light receiver 21 with a weft path between the yarn supplying package 1 and the accumulator 3 interposed therebetween, and a strip shape from the light emitter 20 toward the light receiver 21. It is designed to irradiate the laser light of and to measure the voltage on the light receiving side. Part of the laser beam is blocked by the passing weft yarn 2 and a voltage drop occurs between the two. When the weft yarn 2 having a constant thickness is supplied, the amount of decrease in voltage is almost constant, but as shown in FIG. 3, the knot portion 2a has a larger diameter than the normal portion 2b, so that when the knot portion 2a passes through. A large voltage drop appears. Two sets of defective weft detection sensors 12 configured as described above are provided at positions that make 90 degrees with each other around the weft path, and monitor the thickness of the weft 2 from the vertical direction and the horizontal direction. It is possible to reliably detect the passage of parts.

As shown in the figure, a weft guide 22 for converging the deflection (ballooning) of the weft is provided between the yarn supplying package 1 and the accumulator 3, and the defective weft detection sensors 12A, 12B are provided at a position where the weft path is stable. It is preferable to detect the knot of the yarn by the above method because the width of the laser beam can be narrowed.

The weft cutter 13 is provided between the main nozzle 5 and the suction duct 16 and cuts the weft 2 by moving the cutter blade 13b left and right by an air cylinder or the like.

The weft path breaker 14 is provided in the vicinity of the tip of the main nozzle 5 and is configured to move the blocking plate 14b up and down by an air cylinder or the like. When the blocking plate is lifted, the weft path after the main nozzle is moved. It is blocked.

The blowing nozzle 15 and the suction duct 16 are for collecting and removing the defective weft 2, and the air is blown upward from the lower part of the weft path by the blowing nozzle 15 so that the defective weft 2 blown up with the air is removed. The suction duct 16 is adapted to suck and collect.

The control device 17 is connected to other devices as shown in FIG. 2, and based on the signals from the pair of sensors 12A and 12B, the control panel 18 of the loom, the weft cutter 13, the weft path breaker 14, and the blowing up. An output command is issued to the nozzle 15 and the suction duct 16. The control when the yarn breakage occurs and when the defective weft yarn 2 is supplied will be described below (see FIGS. 4 and 5).

When the weft is not driven in normally, the weaving machine first stops, the warp opening is reversed, and then the weft 2 is blown upward by the blowing nozzle 15 and sucked by the suction duct 16. Next, the weft yarn 2 is cut by the weft yarn cutter 13, and the weft yarn 2 is collected in the suction daft 16. After that, the operation of the loom is restarted.

When a defective defective weft yarn 2 is supplied, the weaving machine stops just before the weft yarn 2 for one pick is driven into the shed, and the weft path interrupting device 14 rises to interrupt the weft path. To be done. Next, by ejecting air from the blowing nozzle 15 with the locking pin (not shown) of the accumulator 3 released, the defective weft yarn 2 is blown up and sucked into the suction duct 16, and then the weft cutter 13 Is driven to cut the weft yarn 2, which is collected in the suction daft 16. After these operations are completed, the accumulator 3 feeds the removed weft 2 and the operation of the loom is restarted.

The illustrated example shows a case where only one weft thread is used, but when using a plurality of weft threads, a defective weft detection sensor is provided for each weft thread.

[0017]

[Effect of device]

 As described above, the automatic weft repair device according to the present invention automatically stops the weaving machine when bulged wefts are supplied and prevents the defective wefts from being driven into the shed. As a result, defective weft yarns are not woven into the product, which improves the quality of the woven product and eliminates the need for repair work, improving production efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an air jet loom according to an embodiment of the present invention.

FIG. 2 is a block diagram of an automatic weft repair device.

FIG. 3 is an explanatory diagram of a knot.

FIG. 4 is a flow chart of control in the case of weft breakage.

FIG. 5 is a flowchart of control when a defective weft with a knot is supplied.

[Explanation of symbols]

 2 Weft 3 Accumulator (length measuring device) 5 Main nozzle 11 Automatic weft repair device 12A, 12B Defective weft detection sensor 13 Weft path blocker 17 Control device

Claims (1)

[Scope of utility model registration request] 1. An automatic weft repairing device provided on a loom configured so that wefts fed from a yarn supplying package are length-measured by a length-measuring device for each weaving width, and the wefts are made to fly by a nozzle and passed through a shed. And a sensor for detecting a defect of the weft thread passing through an appropriate place between the yarn supplying package and the length measuring device,
A weft path breaker capable of interrupting the weft path of the weft that is caused to fly from the nozzle; and a controller for stopping the weaving machine when the sensor detects a defect and operating the weft path interrupter to interrupt the weft path. An automatic weft repairing device comprising: