JPH0586552A - Device for removal of faulty weft yarn in weaving machine - Google Patents

Abstract

PURPOSE:To remove faulty weft yarns without fail by forcibly pushing out the weft yarns on a drum of a device for measurement of weft yarn length through a pushing arm to the end part of the drum and subsequently sucking the pushed-out weft yarns. CONSTITUTION:In removal of faulty weft yarns for restarting of a weaving machine after automatic stopping due to exhaustion of package, exhaustion of rotary yarn guide, root breakage, etc., in the weaving machine equipped with a device for measurement of weft yarn length, the weft yarns wound around the drum (b) of the above-mentioned device 3 for measurement of weft yarn length are forcibly pushed out to the end part of the drum (b) by energizing a rotary solenoid 42 and rotating a pushing arm 43. A suction pipe 44 is actuated at the same time so as to suck and remove the above-mentioned weft yarns.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defective weft removing device for restarting a loom.

[0002]

2. Description of the Related Art Conventionally, in a loom, a weft measuring device between a yarn supplying body and a main nozzle measures the length by winding the weft on a drum by a rotating yarn guide. If weft breakage occurs between the main nozzle and the main nozzle, stop the weaving machine, remove the weft thread remaining on the drum of the weft length measuring device, replace the yarn feeder, and Weft,
Air is drawn through the rotating yarn guide and then through the main nozzle to prepare for restart.

Here, the weft yarn remaining on the drum is removed by a suction device located on the yarn feeder side of the rotary yarn guide while the rotary yarn guide is reversed to rewind from the drum. No. 62-57970).

[0004]

However, in such a conventional defective weft removing device, if the wefts for several turns remaining on the drum are not aligned in the order in which they are wound, the rotary yarn guide. When reversing, the front and back wefts were entangled with each other, and no matter how many times the rotating yarn guide was reversed, the weft on the drum could not be removed.

Further, at the exit portion of the rotary yarn guide, the weft yarn is largely bent and rubbed strongly so that the weft yarn is easily broken. Is impossible to remove. The present invention has been made in view of such conventional problems, and an object of the present invention is to make it possible to reliably remove defective wefts on a drum.

[0006]

For this reason, the present invention provides a loom equipped with a weft length measuring device that winds a weft yarn around a drum by a rotating yarn guide that rotates around the drum and measures the length thereof. The defective weft removing device of the loom is configured by providing a means for pushing out the weft wound on the drum end side and a means for pulling the pushed out weft.

[0007]

In the above structure, when the weft yarn on the drum is removed, the weft yarn wound around the drum is forcibly pushed toward the end of the drum, and the pushed weft yarn is blown by the air stream or the like. To remove and remove. By doing so, it is possible to remove the weft yarn on the drum even when the weft yarn is entangled on the drum or when the weft yarn is broken at the exit portion of the rotary yarn guide.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Referring to FIG. 1, weft Y is a yarn feeder (package)
After being pulled out from the drum 1 and given a predetermined resistance by the tensor 2, it is guided to the rotary yarn guide 9 of the drum type weft length measuring device 3.

The weft length measuring device 3 includes a rotary shaft 5 (see FIG. 6) which is rotationally driven by a motor 4, and a frame-shaped drum which is rotatably supported by the rotary shaft 5 and held stationary. A (wire drum) 6, a length-measuring claw 8 driven by a solenoid 7 to enter and leave a concave portion (between the wires forming the drum) on the tip side peripheral surface of the drum 6, and the measuring claw 8 attached to the rotary shaft 5. And a pipe-shaped rotary yarn guide 9 that rotates integrally with the weft Y around the drum 6. Here, the rotary yarn guide 9 has an inlet located on the center line of the rotary shaft 5, is bent in the middle, and an outlet is located around the drum 6, and the weft Y is guided to the drum 6 by the rotation of the outlet. Wrap around. 5 and 6 show the details of the weft yarn length measuring device 3, and also show the fixed portion 10, the magnet 11 for holding the drum 6 in a stationary state, and the like.

The weft Y from the weft length measuring device 3 is guided to a main nozzle 12 for weft insertion. The main nozzle 12 is attached to the reed holder 14 together with the reed 13 (see FIG. 4). During operation of the loom, the rotating yarn guide 9 is rotated around the drum 6 by the motor 4, and the weft Y is wound around the drum 6 and stored for length measurement. At the time of weft insertion, air injection from the main nozzle 12 is started, and after a predetermined preceding injection is performed, the solenoid 7 causes the length-measuring claw 8 to retreat, whereby the engagement with the weft Y is released, and the main nozzle 12 By the air injection, the weft Y is pulled out and weft insertion is started.

The front end of the weft Y, which is ejected into the opening of the warp W by the main nozzle 12, is blown one after another by the air blown from the auxiliary nozzle 15 which is arranged at a predetermined interval in the weft inserting direction, and the opposite weft inserting side. Fly to. During such weft insertion, drum 6
The upper weft yarn Y is pulled out while being rewound around the drum 6. Then, the unwinding number of the weft Y from the drum 6 is set to the drum 6
It is monitored by the photoelectric unwinding sensor 16 provided on the tip side of, and when one pick length is N turns, the number of signals generated from the unwinding sensor 16 becomes N (or N-1). ,
The length-measuring claw 8 is pushed in by the solenoid 7, and when the N-th winding is unwound by this, the weft Y is locked by the length-measuring claw 8 to complete the weft insertion.

Then, the weft yarn Y inserted in the opening of the warp yarn W is beaten by the reed 13 to the cloth fell 17. Then, in the vicinity of the beating point, the weft yarn Y is cut between the main nozzle 12 and the cloth fell 17 by an electromagnetically driven cutter 18 including an upper movable blade and a lower fixed blade. A cutter guide 19 (see FIG. 2) extends along the upper movable blade, and the weft Y is guided along the lower edge thereof. On the reverse weft insertion side, the weft Y is cut by the cutter 20 after several picks.

Next, the structure of the weft supply device including the defective weft removing device according to the present invention for preparation for restart will be described. The yarn feeder 1 is set in a yarn feeder automatic exchange device 21. As shown in FIGS. 2 and 3, the yarn feeder automatic feeder 21 has a yarn feeder setting jig 24 on a conveyor 23 driven by a motor 22 and rails the ceiling at the position A ₁ above. The yarn feeder 1 is supplied from the carrier 26 traveling by 25 and set, and the yarn feeder 1 at the side A ₂ position is used. When the automatic sheet yarn (package exchange) signal comes, spent yarn supplier or used during the bad feeding Itotai of A ₂ position is discharged is moved to the A ₃ position below, a new from above the sheet The thread is moved to the A ₂ position. Further, in the unused yarn feeder 1, the tip of the weft Y is set in the winding tube, and when replacing the yarn feeder, the tip of the weft Y is delivered by the air blown from the yarn feeding nozzle 27 into the winding tube. It has become so. Note that FIG. 2 shows an example of a two-color loom, and two yarn feeders are used at the same time.

The tensor 2 is composed of a pair of leaf springs that are in pressure contact with each other, and an elliptic cam 28 that can forcefully open the leaf springs.
And a rotary solenoid 29 for driving the cam. Further, a pull-up booster 30 is provided on the inlet side of the tensor 2, and the weft Y is used for the booster 30.
Through the tensor 2. Also, tensor 2
Is provided with a photoelectric sensor 31 for detecting the presence or absence of the weft yarn Y.

In the vicinity of the inlet of the rotary yarn guide 9 of the weft length measuring device 3, the booster 32 is oriented in the same direction as the injection direction of the booster 30 and orthogonal to the rotary yarn guide 9.
Is arranged, and the weft yarn Y is pulled through the booster 32 to the rotary yarn guide 9. A photoelectric sensor 33 for detecting the presence or absence of the weft Y is also provided on the exit side of the booster 32.

A pair of rollers 34 and 35 for gripping and feeding are provided with the yarn path between the booster 32 and the rotary yarn guide 9 interposed therebetween. One roller 34 is a motor 36
The roller 35 can be driven to rotate by the
It is rotatably held at the tip of 37. Therefore, the roller 35 is moved by the projecting operation of the cylinder 37, grips the weft Y between itself and the roller 34, and is driven by the rotation of the roller 34 in this state.

A guide pipe 38 is provided downstream of the booster 32 in the injection direction, and a suction pipe 39 connected to a blower (not shown) is provided downstream of the guide pipe 38. A cutter 40 is provided between the guide pipe 38 and the suction pipe 39. A threading nozzle 41 is provided so as to face the entrance of the rotary yarn guide 9.

As shown in FIGS. 5 and 6, the weft yarn length measuring device 3 rotates the weft yarn Y, which is rotated by the rotary solenoid 42 and is wound on the drum 6 at the time of rotation, as a pushing means. 6 Two pushing arms 43 for pushing forward are provided. A suction pipe 44 connected to a blower (not shown) is provided as a pulling means at the drop position of the weft Y pushed out by the pushing arm 43. The opening of this suction pipe 44 is formed in a bell mouth shape.

A photoelectric sensor 45 for detecting the presence or absence of the weft yarn Y on the drum 6 is provided. Further, the motor 4 for driving the rotary yarn guide 9 is an electromagnetic motor (induction motor), which is not only capable of forward and reverse rotation, but is also capable of switching the power supply frequency by the control of an inverter so that it can be operated at a slow speed. It is possible to rotate,
An electromagnetic brake 46 is provided.

Further, four proximity switches 47 are provided at equal intervals for detecting the rotation of the rotary yarn guide 9, and one proximity switch 48 is provided for detecting the reference point.
Each of these proximity switches 47 and 48 detects an action piece (not shown) attached to the rotary yarn guide 9 and outputs a signal. A booster 49 is provided in the middle of the yarn path between the weft measuring device 3 and the main nozzle 12, and a booster 50 is also provided on the inlet side of the main nozzle 12, so that the weft Y has the boosters 49, 50. Through the main nozzle 12. A photoelectric sensor 51 for detecting the presence or absence of the weft yarn Y is provided on the exit side of the booster 49.

On the weft inserting side of the warp W row, there are provided first and second blowing nozzles 52, 53 attached to the reed holder 14 (see FIG. 2). A fixed bracket 54 is provided above the main nozzle 12, and a V-shaped delivery arm 56 that is swung around its output shaft by an air motor 55 is provided (see FIG. 2).

A suction / injection pipe 57, a pair of take-up rollers 58 and 59, and a suction pipe 60 connected to a blower (not shown) are provided on the fixed bracket 54 (see FIG. 2). The suction / injection pipe 57 generates a suction airflow on the inlet side and an injection airflow on the outlet side by air injection from an air injection port provided on the inner circumference of the intermediate portion, and oscillates by an air cylinder (not shown) to form a pair. Take-up roller 5
It swings between a position oriented between the end faces of 8 and 59 (center) and a position oriented in the tangential direction to the circumferential surfaces of the winding rollers 58 and 59. The air cylinder for swinging the suction / injection pipe 57 is designed to operate in synchronization with the same air supply circuit as the air motor 55 for swinging the delivery arm 56. A photoelectric sensor 61 for detecting the presence or absence of the weft Y is provided at the entrance of the suction jet nozzle 57.

Of the pair of take-up rollers 58, 59, the lower take-up roller 58 has a truncated cone shape and has a concave portion on the upper end surface, and can be driven to rotate by a motor 62. Upper take-up roller
59 is a downward truncated cone shape, which is rotatably held at the tip of a cylinder 63 in the circumferential direction, and is moved downward by the protruding operation of the cylinder 63 so that the lower end fits into the recess of the lower take-up roller 58. Then, the weft Y is gripped, and in this state, the lower take-up roller 58 is rotated.

A cover 64 made of wire mesh is provided above the blowing nozzles 52, 53 attached to the fixed bracket 54 for temporarily receiving the weft yarn Y blown up by these. Two weft yarn sensors 65, 66 attached to the reed holder 14 are provided on the side of the warp W row opposite to the weft insertion side.

The one weft thread sensor 65 is provided at a position where the tip of the weft thread Y reaches when the weft thread is normally inserted. When the sensor 65 does not detect the presence of the thread after the weft thread insertion, it is determined as a show topic. It is a thing. The other weft thread sensor 66 is provided at a position where the tip of the weft thread Y does not reach due to normal weft insertion, and is used to determine that the body is out of stock when this sensor 66 detects the presence of the thread.

Here, a pair of rings 67 and 68 are provided side by side by attaching to the reed holder 14 and between the weft sensors 65 and 66 and at a position where the tip of the weft Y does not reach due to normal weft insertion.
The weft yarn Y is inserted into these rings 67 and 68 when a waist break occurs. And these rings 6
A suction pipe 69, which is connected to a blower (not shown), is opened further on the side opposite to the weft insertion side from 7, 68.

A suction pipe 70 connected to a blower (not shown) is opened at a fixed position (on the temple) on the cloth fell 17 side so as to oppose between the rings 67 and 68. Then, in the middle of the suction pipe 70, a fixed gripping member is provided so that the weft Y sucked by the suction pipe 70 can be gripped.
71 and a movable gripping member 73 driven by the cylinder 72 are provided.

A photoelectric sensor 74 for detecting the presence or absence of the weft Y is provided at the inlet of the suction pipe 70. Here, the above devices are controlled by the control device 75 which receives signals from various sensors. Next, regarding the operation of the weft yarn feeder, (1) package breakage, (2)
The description will be given separately for the case where the rotary yarn guide is cut and (3) the root is cut.

(1) Package breakage The package breakage means that the weft yarn Y is broken at the position C ₁ (see FIG. 1) near the yarn feeder 1. When the package is broken, the weft Y is consumed, and when the sensor 31 detects the absence of the yarn, a loom stop signal (cylinder break pseudo signal) is generated, and 250 ° (loom with a beating of 0 ° is generated. The loom is stopped at the main shaft angle) (see FIG. 7). In this state, the weft yarn Y is almost removed from the rotary yarn guide 9.

From such a stopped state of the loom, reverse inching of the loom is carried out, and the loom is stopped at the warp opening phase of 180 °. Next, the motor 4 is used to bring the rotary yarn guide 9 to a fixed position.
The rotating yarn guide 9 is reversed by. However, the frequency of the power supply to the motor 4 is reduced by the inverter, and the rotating yarn guide 9 is reversed at a slow speed. When the proximity switch 48 for detecting the reference point is turned on during this reverse rotation, the motor 4
The power to the motor is cut off, the electromagnetic brake 46 is activated, and the rotary yarn guide 9 is stopped at a fixed position (YG position in FIG. 5). At this stop position, an air flow is jetted from the outlet of the rotary yarn guide 9 to the weft Y toward the main nozzle 12.
Is a position where there is no risk that the weft Y will be caught by the length measuring claw 8 or the like when the ball is made to fly.

Next, an automatic yarn feeding (package exchange) signal is output to the yarn feeder automatic changing device 21. As a result, the motor 22 operates, the conveyor 23 runs, and the defective yarn feeder being used is discharged, and a new yarn feeder 1 is brought to the use position (in front of the yarn feeding nozzle 27). It Next, the weft Y removing operation on the weft length measuring device 3 is performed as follows (FIG. 8).
reference).

The rotary solenoid 42 is turned on and the pushing arm 43 is operated to push the weft Y wound on the drum 6 forward of the drum 6. At the same time, suction of the suction pipe 44 is started. Then, the rotor solenoid 42 is turned off and on until the sensor 45 detects the absence of the yarn, and the pushing operation by the pushing arm 43 is repeated.
As a result, the weft yarn Y wound on the drum 6 falls from the drum 6 and is suction-removed by the suction pipe 44, and at the same time, the weft yarn Y connected to the main nozzle 12 side is also suction-removed. When the sensor 45 confirms that there is no thread, the rotary solenoid 42 turns off and the suction pipe 44
The suction by is also turned off.

In this example, the rotary solenoid 42 is used as the pushing means to rotate the pushing arm 43. However, as shown in FIG. 20, a direct-acting type cylinder, for example, an air cylinder 100, is used. The weft Y wound on the drum 6 may be pushed forward of the drum 6 by the pushing portion 101 at the tip of the output rod. Next, the first drawing operation (from the new yarn feeder 1 to the weft measuring device 3
The weft Y pulling operation up to the vicinity is performed as follows (see FIG. 9).

The rotary solenoid 29 is turned on and the elliptical cam 28 is operated to open the tensor 2. In addition, the injection of boosters 30 and 32 is started, and the suction pipe
Start suction of 39. In this state, the yarn supplying nozzle 27 is jetted to blow the tip of the weft Y set in the winding tube of the new yarn supplying body 1 to the booster 30. The tip of the weft Y is further blown by the suction / jetting of the booster 30, passes through the tensor 2, and reaches the booster 32. And booster 32
Is further blown by the suction and injection, passes through the guide pipe 38, and is sucked into the suction pipe 39.

After detecting the presence of the yarn by the sensors 31 and 33, the rotory solenoid 29 is turned off to close the tensor 2 and the injection of the boosters 30 and 32 is stopped after waiting for a predetermined time. Then, the cylinder 37 is turned on to bring the roller 35 into pressure contact with the fixed roller 34, and the weft Y is held between them. Then, the weft yarn Y is cut by the cutter 40 between the guide pipe 38 and the suction pipe 39, and the excess yarn is sucked and removed by the suction pipe 39. As a result, the yarn length from the grip between the rollers 34 and 35 to the tip of the weft Y can be regulated. After that, suction by the suction pipe 39 is turned off.

Next, a second pulling operation (weft measuring device 3
From the main nozzle 12 to the main nozzle 12) is performed as follows (see FIGS. 10 and 11). The threading nozzle 41 is jetted so that the jetted air acts on the weft Y between the rollers 34, 35 and the guide pipe 38, and the weft Y is blown into the rotary yarn guide 9. The jet air flows through the rotary yarn guide 9 and then is jetted from the outlet thereof toward the booster 49. As a result, the weft Y, which has come out of the grip between the rollers 34 and 35, is started to be drawn into the rotary yarn guide 9.

At the same time, the motor 36 is turned on to rotate the roller 34, and the weft Y is gradually fed out in cooperation with the driven roller 35. Then, the rotation of the roller 34 is detected by a proximity switch (not shown), and when a predetermined rotation is detected, the motor 36 is turned off to stop the rotation of the roller 34.

As a result, the weft Y, which is ejected from the gripping portion between the rollers 34 and 35, is stably drawn into the rotary yarn guide 9 and, at the same time, the weft Y is fed by a predetermined amount by the rollers 34 and 35. The tip comes to a position where it projects a predetermined length from the outlet of the rotary yarn guide 9 (see FIG. 10). As described above, when the weft Y is pulled through the rotary yarn guide 9, the weft Y is temporarily grasped and sent out at a predetermined position before the rotary yarn guide 9, and the airflow is applied in this state to rotate the weft Y. The weft Y in a straight line in the yarn guide 9
And the tip of the weft Y can be brought to an optimum position.

Simultaneously with the stop of the rotation of the roller 34, the injection of the threading nozzle 41 is once stopped, and then the intermittent injection is started. In addition, the cylinder 37 is turned off and the roller 35
Is separated from the roller 34 and the grip on the weft Y is released. Further, the injection of the boosters 49 and 50 is started, and at the same time, the injection of the main nozzle 12 is also started. As a result, the weft yarn Y is blown, and its tip is pulled through the booster 49 and the booster 50 to the main nozzle 12. Then, the main nozzle 12 flies into the opening of the warp W (see FIG. 11).

However, when the sensor 51 detects the presence of the thread, the injection of the threading nozzle 41 is stopped. That is, the arrival of the weft Y at a predetermined position between the rotary yarn guide 9 and the main nozzle 12 is detected, the jetting of the threading nozzle 41 is stopped, and then the boosters 49, 50 and the main nozzle 12 pull the thread. I do. As a result, the weft Y can be made to fly in a straight line and entanglement can be prevented.

After the sensor 51 detects the presence of the yarn, the weft Y
Wait for a predetermined time for the thread to be inserted into the opening of the warp W. After a lapse of a predetermined time, the cylinder 37 is turned on and the roller
35 is pressed against the fixed roller 34, and the weft Y
To stop the weft Y from flying. At the same time, the injection of the boosters 49 and 50 is stopped, and the injection of the main nozzle 12 is also stopped.

Next, the winding process is performed as follows (see FIG. 12). The rotating yarn guide 9 is normally rotated by the motor 4 to lock the weft Y on the length-measuring claw 8, and then the drum 6 is wound with a predetermined amount of the weft Y. Then solenoid 7
In this way, the measuring claw 8 is retracted to unwind the weft Y. Then, the unwinding sensor 16 detects the number of unwinding, and when the unwinding is performed by two turns, the solenoid 7 causes the length-measuring claw 8 to enter.

Next, the shed processing is performed as follows (see FIG. 13). The delivery arm 56 is brought to the delivery start position (the position shown in FIG. 2) by the air motor 54. When the delivery arm 56 swings, the suction injection pipe 57 also swings. Then, the intermittent injection of the first blowing nozzle 52 is started, and at the same time, the injection of the suction injection pipe 57 is started.

As a result, the slack weft yarn Y that has already been unwound from the drum 6 becomes an inverted U-shape on the tip side of the weft insertion nozzle 12 (specifically, between the cutter guide 19 and the warp yarn W), and It is blown up by the blowing nozzle 52 of No. 1 (Fig. 13
Of the solid line). Here, the weft Y that has been blown up is the cover
Received by 64. Then, reverse rotation inching of the loom is started. This is to enable cutting by the cutter 18.

Simultaneously with this reverse rotation, the intermittent injection of the first blowing nozzle 52 is stopped and the air injection of the second blowing nozzle 53 is started. This is because the first blowing nozzle 52 is hidden under the cutter 18 due to the movement to the cloth fell 17 side,
Further, if the weft yarn Y is constantly blown by the second blowing nozzle 53, the warp yarn W may be entangled. Then, after a lapse of a predetermined time from the start of reverse inching, the delivery arm 56 is rotated by the air motor 54, and the weft Y having an inverted U-shape is entrained and delivered to the inlet of the suction jet pipe 57 to be sucked by it. Immediately before this delivery, the injection of the second blowing nozzle 53 is stopped. The weft Y, which has been sucked into the suction jet pipe 57, is further subjected to the action of jet air, and the winding roller 58,
It is drawn through the grip between the end faces of 59 (state of the broken line in FIG. 13).

Then, the reverse inching is stopped at 45 °. Then, after returning the delivery arm 56 to the delivery start position again, the sensor 61 detects the presence or absence of the weft Y. The reason why the delivery arm 56 is returned is that it interferes with sensing. When the presence of the yarn is detected by the sensor 61, the suction / injection pipe 57 is rocked together with the delivery arm 56, and the tip end thereof is directed between the end faces of the winding rollers 58 and 59 (center).

Then, after a predetermined time, the suction injection pipe 57
Stop the injection of. This is the following take-up roller 58, 59
This is to prevent splashing of the jet air when the weft Y is gripped by. Then, after a predetermined time, the winding roller 59 is moved downward by the cylinder 63 and pressed against the winding roller 58, and the weft Y is held between them.

Then, the cutter 18 is cut about 5 times to cut the weft Y near the tip of the main nozzle 12 (point S in FIG. 13). The reason why the cutting operation is performed about 5 times is that it is necessary to surely cut because of the low tension. Then, the suction / injection pipe 57 is swung together with the delivery arm 56 so that the tip end of the suction / injection pipe 57 is directed tangentially to the peripheral surfaces of the winding rollers 58 and 59. This is to prepare for smooth winding.

Then, the injection of the suction injection pipe 57 is started. At the same time, perform forward inching of the loom and stop at 180 ° of the warp opening phase. Then, the drive side winding roller 58
Is rotated by a motor 62. As a result, the driven-side winding roller 59 also rotates. As a result, the weft yarn Y is wound around the take-up rollers 58 and 59 while being pulled by the suction jet pipe 57 in the winding direction. As a result, the weft Y is pulled out from the opening of the warp W.

Then, the completion of winding is known by detecting the yarn absence of the sensor 61, and the winding rollers 58 and 59 are opened by the cylinder 63. At the same time, the motor 62 drives the take-up rollers 58, 59.
Stop rotating. As a result, the weft yarn Y, which is gripped and wound by the winding rollers 58 and 59, is released, and is blown by the blast air of the suction jet pipe 57 while being sucked into the suction pipe 60 and removed.

After that, the delivery arm 56 is returned to the fixed position (delivery end position), the injection of the suction injection pipe 57 is stopped, and the suction of the suction pipe 60 is turned off. Also, the rotary solenoid 29 closes the tensor 2. As a result, the loom is ready for restart, and the loom is restarted. (2) Rotational yarn guide breakage The term "rotational yarn guide breakage" means that the weft yarn Y is cut off at the C ₂ position (see Fig. 1) near the exit of the rotary yarn guide 9.

When the rotating yarn guide breaks, the weft sensor 66 generally detects the presence of the yarn (cutting of the body). In the case of this cylinder break, the weaving machine is stopped based on the signal from the weft thread sensor 66. In this case, the weft thread Y is inserted into the rings 67 and 68 (see FIG. 14). Therefore, after starting suction with the suction pipe 70, the reed 13
Is moved forward and the weft Y between the rings 67 and 68 is sucked into the suction pipe 70.

Next, the reed 13 is retracted. At this time, the cylinder 72 is operated to hold the weft Y in the suction pipe 70 by the holding members 71, 73. Therefore, the weft yarn Y is pulled by the backward movement of the reed 13. When the reed 13 is retracted, the suction of the suction pipe 70 is turned off. Then reed
When 13 is moved forward, the weft Y sags between the rings 67, 68 and the gripping members 71, 73. At this time, the gripping members 71, 73 are opened, so that the slack is sucked into the suction pipe 70.

After that, retreat and forward of the reed 13 are repeated,
By gripping the gripping members 71, 73 at the time of retreating and opening at the time of advancing, the weft Y is sucked and removed into the suction pipe 70 (see FIG. 15). Then, when the removal is completed and the sensor 74 detects the absence of the yarn, the above operation is completed.

After this, the presence or absence of the weft yarn Y on the drum 6 is detected by the sensor 45, and since there is no yarn, the following operation is performed. The booster 32 is jetted to pull out the weft Y in the rotary yarn guide 9, and at the same time, suction of the suction pipe 39 is started, and the tip of the weft Y is sucked into the suction pipe 39 via the guide pipe 38 (FIG. 15). reference).

Then, after the injection of the booster 32 is stopped, the cylinder 37 is operated to grip the weft yarn Y between the rollers 34 and 35, and then the weft yarn Y is cut by the cutter 40 between the guide pipe 38 and the suction pipe 39. And cut the thread to define the thread length from the grip to the tip. After cutting, suction by the suction pipe 39 is turned off. And rotary solenoid
Turn on 29 and open tensor 2.

After this, the second pulling operation after the package has run may be executed. When the weft sensor 65 detects the absence of yarn (showtopic) after weft insertion due to the breakage of the rotating yarn guide, the weaving machine is stopped based on the signal from the weft sensor 65, and then the weaving machine is rotated in the reverse direction. Is opened, the weft Y is blown off by the main nozzle 12 and the auxiliary nozzle 15, and the suction pipe 69 sucks and removes it.

(3) Root cutting The root cutting means that the weft Y is cut at the position C ₃ (see FIG. 1) between the drum 6 and the main nozzle 12. When the root is broken, the body is broken and the weft sensor 66 detects the presence of the thread.

Therefore, the loom is stopped based on the signal from the weft sensor 66. In this case, the weft Y is ring 67, 68
It is inserted inside (see Figure 16). Therefore, as in the case where the rotary yarn guide is broken, the warp W is moved by the reciprocal movement of the reed 13.
The weft Y in the opening is sucked and removed into the suction pipe 70 (see FIG. 17). After that, the presence or absence of the weft yarn Y on the drum 6 is detected by the sensor 45, and since the yarn is present, the following operation is performed.

The rotary solenoid 42 is turned ON and the pushing arm 43 is operated to push the weft yarn Y wound on the drum 6 forward of the drum 6. At the same time, suction of the suction pipe 44 is started. Then, the rotor solenoid 42 is turned off and on until the sensor 45 detects the absence of the yarn, and the pushing operation by the pushing arm 43 is repeated.
As a result, the weft yarn Y wound on the drum 6 falls from the drum 6 and is sucked by the suction pipe 44 (see FIG. 17). When the sensor 45 confirms that there is no yarn, the rotary solenoid 42 is turned off, and the suction by the suction pipe 44 is also turned off.

Next, the tensor 2 is opened by the rotary solenoid 29 and the injection of the booster 32 is started. As a result, the weft Y is pulled out from the yarn feeder 1. At the same time, suction of the suction pipe 39 is started, and the weft Y is sucked into the suction pipe 39 through the guide pipe 38 (see FIG. 18).
Then, after stopping the injection of the booster 32, the cylinder 37
Is operated to grip the weft Y between the rollers 34 and 35, and the weft Y is cut together by the cutter 40 between the guide pipe 38 and the suction pipe 39, and the yarn length from the gripping portion to the tip is measured. Prescribe (see Figure 19). The cut weft yarn Y is sucked and removed by the suction pipe 39, and then the suction by the suction pipe 39 is turned off.

Next, suction of the suction pipe 44 is started, the weft Y remaining in the rotary yarn guide 9 is suctioned and removed, and then suction by the suction pipe 44 is turned off. After this, the second pulling operation after the package is exhausted may be executed.

[0063]

As described above, according to the present invention, the weft thread wound on the drum around the drum is forcibly pushed to the end portion side of the drum to remove the weft thread on the drum. Even if the above wefts are entangled with each other, the effect that the wefts can be reliably removed is obtained.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

2 is an overall perspective view

FIG. 3 is a side view of the automatic yarn feeder changing device.

FIG. 4 is a front view of a main nozzle portion.

FIG. 5 is a front view of the weft length measuring device.

6 is a partial cross-sectional view seen from the direction A in FIG.

FIG. 7 is a schematic diagram showing an operation example 1-1.

FIG. 8 is a schematic diagram showing an operation example 1-2.

FIG. 9 is a schematic diagram showing an operation example 1-3.

FIG. 10 is a schematic diagram showing an operation example 1-4.

FIG. 11 is a schematic diagram showing an operation example 1-5.

FIG. 12 is a schematic diagram showing an operation example 1-6.

FIG. 13 is a schematic diagram showing an operation example 1-7.

FIG. 14 is a schematic diagram showing an operation example 2-1.

FIG. 15 is a schematic diagram showing an operation example 2-2.

FIG. 16 is a schematic diagram showing an operation example 3-1.

FIG. 17 is a schematic diagram showing an operation example 3-2.

FIG. 18 is a schematic diagram showing an operation example 3-3.

FIG. 19 is a schematic diagram showing an operation example 3-4.

FIG. 20 is a diagram showing another embodiment.

[Explanation of symbols]

 1 yarn feeder 2 tenser 3 weft measuring device 6 drum 8 measuring claw 9 rotating yarn guide 12 main nozzle 42 rotary solenoid 43 extrusion arm 44 suction pipe 45 sensor 75 controller 100 air cylinder 101 extrusion part

Claims (1)

[Claims] 1. A weaving machine equipped with a weft length measuring device that winds a weft yarn around a drum and measures the length of the weft yarn by means of a rotating yarn guide that rotates around the drum. A defective weft removing device for a loom, characterized in that it is provided with a means for pushing the weft and a means for pulling the pushed weft.