JPH08311745A - Yarn feeder in jet loom - Google Patents

Abstract

PURPOSE: To obtain the subject apparatus capable of quickly removing a pig tail part by making a nipper of a tensor relatively separate by a driving means when switching a reserve yarn feeder as a new yarn feeder. CONSTITUTION: A loom is stopped when a residual amount of a yarn feeder 8 reaches a prescribed value and weft containing a pig tail part 10 is removed by dragging with a weft inserting nozzle 20 and a dragging device 30 to switch to a reserve yarn feeder 9. At this time, a movable disk 46 of a tensor 40 is separated from a fixed disk 45 by a pressurized air, etc. The weft is quickly drawn out in a released state and a dragging-removing action is quickly performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn feeding device for a jet loom equipped with a tensor, and when a weft is switched from a yarn feeding body to a preliminary yarn feeding body, a portion where a weft end portion between them is spliced ( The present invention relates to a yarn feeding device for a jet loom for weaving a high-quality woven fabric by quickly removing the pick tail portion) so as not to be woven into the woven fabric.

[0002]

2. Description of the Related Art Conventionally, a so-called pick, which is provided with a yarn feeder and a preliminary yarn feeder, connects a yarn feeding end of the yarn feeding body and a yarn feeding start end of the preliminary yarn feeding body to be integrated with each other. A tail is provided so that when the weft yarn of the yarn feeder runs out during use, the weft yarn is switched to the preliminary yarn feeder so that the weft yarn is supplied as a new yarn feeder. By the way, especially in a jet loom in which a woven cloth of glass yarn used for a core material of an electronic circuit board or the like is woven, a yarn knot (pick tail portion)
When the woven fabric is woven into the woven fabric, the quality as an electronic substrate cannot be ensured. Therefore, the knot of the thread is removed before being woven into the woven fabric, and the high quality woven fabric is woven.

Therefore, for example, a photoelectric residual thread amount sensor is provided in the yarn supplying body, the residual thread amount of the yarn supplying body is detected by the residual thread amount sensor, and the detected residual yarn amount is set to a predetermined value. When the value is reached, the operation of the loom is stopped, the air flow is jetted from the weft insertion nozzle, the drum of the weft measuring and storing device is driven to rotate, and the weft including the knot (pick tail) is indexed to the weft insertion nozzle side. Some of the weft yarns that have been removed and switched to the preliminary yarn feeder are indexed to the weft insertion nozzle side, pass through the weft insertion nozzle from the weft insertion nozzle, and are collected by the suction blower provided on the opposite weft insertion side. . (JP-A-59-82446).

In the above apparatus, since the drum of the weft measuring and storing device is rotationally driven to pull out the weft from the yarn feeder side, it takes time until the weft yarn is switched to the preliminary yarn feeder, and the loom is stopped. The time becomes longer and the operation rate decreases.

In order to improve this, JP-A-6-4738
The technique disclosed in No. 3 is known. This is because the weft thread is wound on the fixed drum by the rotation of the winding arm, and the length measuring claw that moves back and forth with respect to the drum
A so-called feeder-type weft measuring and storing device that sorts the wefts for the pick is used, and when the remaining yarn amount of the yarn feeder reaches a predetermined value, after stopping the loom,
The weft yarn is drawn out into the warp opening row by the air injected from the weft insertion nozzle, and the picktail portion is removed by pulling and removing the weft yarn by the pulling air flow of the pulling device between the weft inserting nozzle and the warp yarn row. Is.

By the way, there is generally provided a tensor which holds a weft yarn between a pair of disks to impart pulling resistance when the weft yarn is pulled out from the yarn feeder toward the length measuring and storing device. The weft is pulled out from the yarn feeder by the rotation of the winding arm of the weft measuring and storing device and is wound on the drum, but the weft from the yarn feeder is drawn while rotating around the yarn feeder and is centrifugally generated. The so-called ballooning, which swings to a large degree, is occurring. on the other hand,
In the weft measuring and storing device, the rotation speed of the winding arm changes according to the amount of weft accumulated on the drum, and when the rotating speed of the winding arm decreases, the weft withdrawing speed on the weft measuring and storing device side decreases, but The weft from the yarn body is pulled out more than necessary by the centrifugal force due to the ballooning and the inertial force of the weft, and the weft is entangled in a loose state,
Alternatively, the weft thread tension when the weft thread is wound around the drum changes significantly, and the pullout resistance when the weft thread is pulled out from the drum by the jet air of the weft insertion nozzle changes significantly, so that the weft threads wound on the drum are different from each other. There is a possibility that weft insertion may occur due to overlapping, and the above-mentioned tensor is provided to prevent this.

[0007]

However, as disclosed in Japanese Unexamined Patent Publication No. 6-47383, the tenser acts as a pull-out resistance for the weft when pulling and removing the pick tail portion, and a weft insertion nozzle is used. Since it is pulled by the airflow with the pulling device, its pulling force is small, so the pulling speed of the weft is low, it takes time until the pick tail part is completely pulled out and restarted, and the operating rate decreases. There is a problem that it ends up.

The present invention has been made in order to solve the above-mentioned conventional problems. Even when a tenser is provided, the yarn supplying body can be switched using the preliminary yarn supplying body as a new yarn supplying body. It is an object of the present invention to provide a yarn feeding device for a jet loom that can be quickly performed.

[0009]

For this reason, the first aspect of the present invention is
A yarn feeder having a pick tail portion formed by joining the weft end portion to the auxiliary yarn feeder, a tensor for sandwiching the weft yarn from the yarn feeder with a holding body, and giving pulling resistance, and a tenser. The weft length measuring and storing device that winds and stores the weft yarn from the device on the drum by the winding arm, and the weft yarn that is wound and stored on the drum of the weft length measuring and length measuring device is pulled out by the jet fluid and inserted into the warp opening row. A weft inserting nozzle for inserting yarn is provided, the loom is stopped when the residual yarn amount of the yarn supplying body reaches a predetermined value, and the yarn is supplied by the jet fluid from the weft inserting nozzle via the weft measuring and storing device. The weft yarn from the body is pulled out, and the weft yarn including the pick tail portion is pulled and removed by the fluid from the pulling device provided on the warp opening row side so that the preliminary yarn feeding body is switched as a new yarn feeding body. In the device, Serial in conjunction with the pulling operation of removing the weft comprising a pick tail, characterized in that a driving means for releasing the weft yarn by relatively separating the holding member of the tenser. Secondly, the drive means has a drive section that is driven by a fluid, and the fluid supply section that supplies the fluid to the drive section is connected to the fluid supply path of at least one of the traction device and the weft insertion nozzle. It is characterized by

[0010]

The function is to stop the loom when the remaining yarn amount of the yarn feeder reaches a predetermined value. Then, the weft from the yarn feeder is pulled out through the weft measuring and storing device by the fluid ejected from the weft inserting nozzle, and the picked-out weft is pulled by the fluid from the pulling device provided on the warp opening row side. The pick tail portion is prevented from being woven into the woven cloth by pulling and removing including the above and switching the preliminary yarn supplying body as a new yarn supplying body. Here, during the pulling and removing operation of the weft yarn, the holding body of the tensor is relatively separated by the driving means to release the weft yarn.
As a result, the weft yarn is quickly pulled out from the yarn feeder without receiving resistance from the tensioner, and the pulling and removing operation is performed quickly. Further, if the release driving means of the holding body is driven by a fluid, and the fluid supply section of the drive section is connected to the fluid supply path of at least one of the pulling device and the weft inserting nozzle, a fluid for pulling and removing the weft thread. The disk can be driven by this, and the drive mechanism is simple and inexpensive.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an entire jet loom yarn feeder of one embodiment. A support shaft 3 is provided at the center of a turntable 2 as a holding means of the yarn feeder supplying device 1. The turntable 2 expands / contracts a single-acting spring type air cylinder 4 as a drive means by a control signal from a control device 15 as a control means, which will be described later.
The bobbin holders 7 are rotated and stopped about the support shaft 3 at regular intervals. An on-off valve 6 is provided in the pressurized air supply path 5 of the air cylinder 4. The on-off valve 6 is
The electromagnetically driven self-recovery type is electromagnetically driven by a drive signal from the control device 15 to perform a valve opening operation, and self-restoring by a spring and valve closing operation by stopping the output of the driving signal.

The plurality of bobbin holders 7 are attached to the peripheral portion of the turntable 2 so as to project toward the weft measuring and storing device 16 side and are evenly arranged in the circumferential direction. A yarn feeder 8 and a preliminary yarn feeder 9 are attached to the plurality of bobbin holders 7. The weft end of the yarn feeder 8 is tied to the weft start end of the preliminary yarn feeder 9, and the yarn feeder 8 and the preliminary yarn feeder 9 are pick-tailed. The position of the yarn feeder 8 is the yarn feeding position.

Around the turntable 2, there is provided a switching sensor 11 as a switching detection means for detecting that the weft Y including the knot (pick tail portion) 10 of the yarn supplying body 8 and the preliminary yarn supplying body 9 is pulled out. It is provided. The detection signal of the switching sensor 11 is supplied to the control device 15.

On the side of the turntable 2, there is provided a residual thread amount sensor 12 as residual thread amount detecting means. The remaining thread amount sensor 12 is a reflection type optical sensor, and when the remaining amount of weft threads (for example, white threads) of the yarn supplying body 8 becomes less than a predetermined amount, the bobbin (for example, black) is exposed and the amount of reflected light changes, and the sensor I sense this. The detection signal of the remaining thread amount sensor 12 is used as the control device 1
5 is supplied.

A tenser 40 is provided between the yarn supplying body 8 and the weft measuring and storing device 16 in order to apply an appropriate tension to the weft Y when the weft Y is continuously withdrawn from the yarn supplying body 8. Has been done. The weft Y is pulled out from the yarn feeder 8 via a tensor 40 and is passed through a winding arm 17 of the weft measuring and storing device 16.

The weft measuring and storing device 16 hooks the weft Y on the locking claw 19 inserted into the peripheral surface of the drum 18 by the relative rotation between the winding arm 17 and the drum 18.
It is a contract feeder type weft measuring and storing device that winds and stores one pick or more around the peripheral surface of the drum 18. The winding arm 17 is connected to an output shaft of a motor (not shown) that is rotationally driven in one direction by a drive signal from the control device 15. The locking claw 19 is of an electromagnetic drive type that is pulled out from the peripheral surface of the drum 18 by a drive signal from the control device 15 and inserted into the drum 18 by a spring.

The tensor 40 has a sandwiching body for sandwiching the weft Y drawn out from the yarn supplying body 8 and imparting pulling resistance, in this embodiment, a pair of disks 45 and 46, and a compressed air as a fluid supply path. The movable disk 46 is fixed by being connected to the branch path 50 as a fluid supply part branched from the pressurized air supply path 36 from the supply path 36 via the opening / closing valve 37, and receiving the supply of air through the branch path 50. The weft yarn Y is separated from the disc 45 so that no resistance is applied to the weft yarn Y. Further, the branch path 50 is provided with a speed controller 62 functioning as an adjusting valve for adjusting the air flow rate, and the pressurized air supply path 36 is similarly provided with a speed controller 61. The tensor 40 does not require a large air flow rate, so the flow rate is small, and the traction device 30 requires a large flow rate, so the tensor 40 is adjusted to have a large flow rate.

The weft yarn Y stored in the drum 18 of the weft length measuring and storing device 16 passes through the locking claw 19 and the weft insertion nozzle 2
Has been pulled to zero. An on-off valve 22 is provided in a weft insertion pressurized air supply path 21 as a fluid supply path of the weft insertion nozzle 20. The on-off valve 22 is of an electromagnetically driven self-reset type that receives a drive signal from the control device 15 and self-returns with a spring to close the valve.

In the weaving machine, when the weft is inserted, the locking claw 19 is pulled out from the drum 18 and the air is jetted from the weft inserting nozzle 20, so that the weft Y is formed into a jet flow of the air jetted from the weft inserting nozzle 20. Put it on and insert the weft into the warp opening (not shown). Subsequent to this weft insertion, the reed 23 attached to the reed holding table (not shown) connected to the repulsion movement mechanism (not shown) performs a beating motion. By this beating operation, the weft Y inserted in the warp shed is beaten at the front of the cloth not shown and crossed with the warp vertically to be woven into a cloth not shown. Then, in the vicinity of the beating point, the cutter 25 cuts the beating yarn Y that has been beaten between the weft inserting nozzle 20 and the cloth fell. These weft insertion, beating, and cutting are repeated in sequence,
Woven cloth is woven. The cutter 25 is of an electromagnetic drive type that performs a cutting operation in response to a drive signal from the control device 15, and has a diamond blade cutting blade 25.

Further, on the warp opening row side of the weft inserting nozzle 20, particularly between the weft inserting nozzle 20 and the warp row not shown,
A traction device 30 utilizing an air flow is provided. When the weft Y is blown upward by the air jet from the blowing nozzle 32, the cutter guide 31 of the pulling device 30 moves the weft Y side portion of the weft Y between the weft inserting nozzle 20 and the warp row. The blade 25 is supported from above, and the supporting portion is supported by the cutting blade 25 of the cutter 25 as the reed holder is moved.
It leads to.

The blow-up nozzle 32 of the pulling device 30 blows up the weft Y upward between the cutter guide 31 and the warp row, and is attached to the reed holder. An on-off valve 34 is provided in the pressurized air supply path 33 as a fluid supply path of the blow-up nozzle 32. The on-off valve 34 is electromagnetically driven by a drive signal from the control device 15 to open the valve, and when the output of the drive signal is stopped, it is self-restored by a spring to close the valve. It is an electromagnetically driven self-resetting type.

The traction pipe 35 of the traction device 30 generates the suction airflow from the air supplied from the pressurized air supply path 36 as a fluid supply path to the inlet 35a at the middle portion of the traction pipe 35, and the suction airflow causes the cutter to flow. Between the guide 31 and the warp row, it is an ejector type in which the weft Y that has sucked up the weft Y that has been blown up from the blowing nozzle 32 side is pulled by the airflow that is jetted toward the outlet 35b side, which is not shown in the figure. It is attached to the heald guide bracket. An on-off valve 37 is provided in the pressurized air supply path 36 of the tow pipe 35. The on-off valve 37 is electromagnetically driven by a drive signal from the control device 15 to open the valve,
When the output of the drive signal is stopped, it is an electromagnetically driven self-recovery type that self-recovers with a spring and closes the valve. In FIG. 1, S indicates a signal line between the on-off valve 7 and the control device 15.

FIG. 2 shows the tensor 40. The tubular body 41 and the tensor stud 42 are fastened via a washer 43 and are erected at the center of the support body 44. An annular fixed disk 45 is fixed to the upper surface of the support body 44. A movable disk 46 is slidably fitted on the outer surface of the tensor stud 42.

The tensor stud 42 has an air passage 47 at the center.
The air passage 47 has a through hole 48 that is substantially orthogonal to the upper side.
The lower part is in communication with a branch path 50 formed of an air tube through a tube joint 49.
Here, the branch path 50 constitutes a fluid supply unit when supplying fluid (air) to the drive unit of the movable disk 46.

The movable disk 46 is composed of the tensor studs 42.
The spring 52 is interposed between the crown 51 fixed to the movable disk 46 and the movable disk 46, and the spring 52 is urged toward the fixed disk 45. It is designed to be sandwiched between the fixed disk 45 and the movable disk 46 to provide pullout resistance.

The upper end of the sliding surface 46a which slides on the outer peripheral surface of the tensor stud 42 of the movable disk 46 is covered with a lid 53 to form an air chamber 54. Pressurized air supply path 3
When the on-off valve 37 provided at 6 is opened, the pressurized air passes through the branch path 50, the air passage 47 of the tensor stud 42 and the through hole 48, and is introduced into the air chamber 54 formed by the tensor stud 42 and the lid 53. And the air pressure is spring 52
The movable disk 46 is pushed up against the spring force of. That is, the tensor stud 42 and the lid 53 constitute a drive unit for the disk (movable disk 46). As a result, the movable disc 46 is separated from the fixed disc 45, and the weft Y is not pulled out. Also,
The upward movement of the movable disk 46 is restricted by the stopper 55. The air introduced into the air chamber 54 is gradually discharged through the gap between the tensor stud 42 and the lid 53. It should be noted that the air may be discharged without providing a gap so that the branch path 50 side is released to the atmosphere when the opening / closing valve 37 is closed, for example. In addition, the branch path 50, the tube joint 49, the tubular body 41, and the tensor stud 4 described above.
2 and the lid 53 constitute a drive means for the disc (movable disc 46).

Further, a yarn guide 56 is provided on the support 44, and the weft Y is guided by the yarn guide 56 so as to pass between the fixed disc 45 and the movable disc 46.

First, the operation of the tensor 40 will be described. The opening / closing valve 37 is closed during the operation of the loom, and pressurized air is not supplied to the tensor 40. Movable disk 46 of tensor 40
Is pressed by a spring 52 and pressed against a fixed disk 45, and the weft Y is held between the fixed disk 45 and the movable disk 46. As a result, the weft Y is given an appropriate pulling resistance, the weft Y is not entangled, and when the weft Y is wound around the drum 18 of the weft measuring and storing device 16, there is no large change in tension and the aligned state is maintained. Is also done properly.

When the remaining amount of the weft yarns of the yarn supplying body 8 becomes less than a predetermined amount, the bobbin is exposed and the amount of light received by the remaining yarn amount sensor 12 changes, and the control device 15 causes the detection signal from the remaining yarn amount sensor 12 to be detected. Reaches a predetermined value preset and stored in the control device 15, and the weft thread replacement control operation is performed according to a preset operation procedure. Remaining thread amount sensor 12
When the detection signal from the machine reaches the predetermined value, a loom stop signal is issued. The on-off valve 37 is in the closed state when the loom is stopped. At this time as well, pressurized air is not supplied to the tensor 40, and the movable disk 46 of the tensor 40 is pressed against the fixed disk 45 by the suppression force of the spring 52 to come into pressure contact with the weft Y to provide pullout resistance. Therefore, when the loom is stopped, the weft Y is not unnecessarily pulled out due to overrun.

After the loom is stopped, the open / close valve 37 is opened and pressurized air is supplied to the tensor 40 through the branch path 50 when switching the yarn supplying body from the preliminary yarn supplying body 9 to the new yarn supplying body 8. The pressurized air is branched into the air chamber 54 of the tensor 40 through the branch path 5.
0, the air passage 47, and the through hole 48, the air pressure resists the spring force of the spring 52 and pushes the movable disk 46 upward. The movable disk 46 is the fixed disk 4.
It is separated from No. 5, and the weft Y is in a state where pull-out resistance is not applied. At this time, the pressurized air is also supplied to the pulling device 30, so that the pulling device 30 detects the weft Y including the knot 10.
Tow and remove. At this time, the tensor 40 is released, and the weft Y is not pulled out by the tensor 40. Therefore, the weft is smoothly pulled and removed.

When the switching of the yarn feeder 8 is completed, the opening / closing valve 37 is closed to stop the supply of the pressurized air to the tensor 40 and the traction device 30. As a result, the tensor 40 is in a state of imparting resistance to the weft Y when the loom is stopped. Therefore, when the weft Y is manually wound around the drum 18 of the weft length measuring device 16 while the loom is stopped, the weft tension is small, so that a large change in the tension of the weft and the overlap of the weft are prevented. It

Next, the pulling and removing work of the weft yarn Y including the knot 10 will be described. First, as shown in FIG. 1, the weaving machine is operated, weft insertion, reed beating, and weft cutting are sequentially repeated. When reaching, the control device 15 stops the operation of the loom. Specifically, the controller 15 stops during weft insertion into the warp shed at the next pick when the detected remaining yarn amount reaches a predetermined value (see primary stop in FIG. 6). After this primary stop, the control device 15 drives the loom to rotate normally at a low speed, and stops the normal rotation drive of the loom when the blow-up nozzle 32 is located directly below the entrance 35a of the towing pipe 35 (see FIG. 6). (Refer to the secondary stop). Since the weaving machine is still in the weft insertion state, the locking claw 19 of the weft measuring and storing device 16 is being held.
Is driven by the drive signal from the controller 15
Has been pulled from the surface.

Next, as shown in FIG. 3, the controller 15
The opening / closing valve 34 is opened. As a result, air is jetted upward from the blow-up nozzle 32 as indicated by arrow X. By the air blown from the blow-up nozzle 32, the weft Y is blown up toward the entrance 35a side of the traction pipe 35 so as to draw a substantially U-shape between the cutter guide 31 and the weft.

Simultaneously with or slightly after the opening operation of the opening / closing valve 34, the control device 15 opens the opening / closing valve 37 as shown in FIG. As a result, compressed air is supplied to the tensor 40 and the traction device 30. Since the compressed air is supplied to the tensor 40 through the branch path 50, the movable disk 46 is pushed up by the air pressure against the spring force of the spring 52 in FIG. The pull-out resistance is not applied. Further, a suction force is generated at the inlet 35a of the traction pipe 35, and a traction force is generated at the outlet 35b side of the traction pipe 35. Therefore. The weft yarn Y blown up by the air flow from the blowing nozzle 32 is taken into the traction pipe 35 without resistance. A little after the opening operation of the opening / closing valve 37, the controller 15 closes the opening / closing valve 34 and opens the opening / closing valve 22.

That is, after the weft Y blown up by the air jet from the blow-up nozzle 32 is taken into the traction pipe 35, the air jet from the blow-up nozzle 32 is stopped and the air from the weft insertion nozzle 20 is removed. To jet. The weft Y is pulled out from the weft opening by the traction force of the air flow from the weft insertion nozzle 20 and the air flow from the traction pipe 35, and the weft measuring and storing device 16
After being wound from the peripheral surface of the drum 18, the weft Y, which is the residual yarn of the yarn supplying body 8, is pulled, and the weft Y including the knot 10 is further wound on the winding arm 17 of the weft measuring and storing device 16 and the weft inserting nozzle. 20 and is taken into the tow pipe 35.

At this time, in the process in which the weft yarn Y including the knot 10 moves from the yarn feeder supplying device 1 to the winding arm 17 side, the withdrawal of the weft yarn Y is switched from the yarn feeder to the preliminary yarn feeder 9 and the yarn feeder. Only the bobbin main body 8 remains in the bobbin holder 7, and the switching sensor 11 detects that the weft Y is switched from the yarn supplying body 8 to the preliminary yarn supplying body 9 and outputs the detection signal to the control device 15.

Then, as shown in FIG.
Receives the detection signal from the switching sensor 11 and causes the air cylinder 4 of the yarn supplying device 1 to expand and contract once. As a result, the turntable 2 rotates in one direction by one pitch which is the distance between the adjacent bobbin holders 7 and then stops, and the position of the preliminary yarn feeder 9 is changed to the position of the yarn feeder 8 which has been used until then. Will be replaced. By the position replacement operation between the preliminary yarn feeder 9 and the yarn feeder 8 by the yarn feeder 1, the preliminary yarn feeder 9 whose position has been switched becomes a new yarn feeder 8 and the loom is re-driven. It At this time, the positional relationship between the new preliminary yarn supplying body 9 as the yarn supplying body 8 and the winding arm 17 of the weft measuring and storing device 16 is the same as the positional relationship between the yarn supplying body 8 and the winding arm 17 which have been used so far. Is equivalent to For this reason, even when the preliminary yarn feeder 9 which is the new yarn feeder 8 is used, the weft yarn Y sent out to the weft measuring and storing device 16 side.
There is no change in ballooning and weft tension does not fluctuate, so weft insertion is reliable.

In parallel with this, the control device 15 controls the knot 10 from the input of the detection signal from the switching sensor 11.
After the lapse of time required to take in the tow pipe 35, the cutter 25 is cut. As a result, the cutter 25 cuts the weft Y in the vicinity of the cutter guide 31. Simultaneously with the completion of the cutting, the weft Y on the traction pipe 35 side is pulled and removed by the traction pipe 35.

Subsequently, the control device 15 closes the opening / closing valve 37, inserts the locking claw 19 of the weft measuring and storing device 16 into the peripheral surface of the drum 18, and then rotates the winding arm 17 in one direction. The weft yarn Y of one pick or more is driven and wound around the peripheral surface of the drum 18 and stored. then,
Since aerodynamic force does not act on the movable disk 46 of the tensor 40, the movable disk 46 is pressed by the spring 52 and presses against the fixed disk 45 to clamp the weft Y. Weft Y
Since the pulling resistance is applied by the tensor 40, when the weft Y is wound around the drum 18 of the weft measuring and storing device 16, the weft is prevented from overlapping due to the small tension of the weft. After the on-off valve 22 is closed, the loom is reversely rotated at low speed until the detected residual yarn amount reaches the predetermined value, and then the loom is normally driven at normal speed to idle the machine. This prevents the weft yarn at the cloth fell from slipping to the warp side and forming a weft. Then, following the blanking once or twice, the weaving of the loom, the beating, and the cutting are sequentially repeated to start the re-driving so as to weave the woven fabric (see FIG. 6).

In the above embodiment, the disk type was described as the holding body of the tensor, but the holding body is not limited to this, and the weft may be bent by a plurality of rod-shaped bodies. Further, the movable disk 46 is driven by a fluid, and its driving portion (tensor stud 42 and lid 5).
3) The fluid supply unit (branch path 50) of 3) is connected to the traction pipe 3
5 is connected to the fluid supply path (pressurized air supply path 36), but it is not limited to this, and may be provided in the fluid supply path (pressurized air supply path 21) of the weft insertion nozzle 20. The insertion nozzles 20 may be connected to the same fluid supply path, that is, the pressurization air supply path 21 for weft insertion, and the fluid supply unit (branch path 50) may be connected to this path. In addition, the movable disk 4 of the tensor 40
Since the releasing operation of 6 is interlocked with the pulling and removing operation of the weft,
The fluid supply unit (branch path 50) is connected to the fluid supply path (pressurized air supply path 36) and the opening / closing valve 37 and the traction pipe 3 are connected.
It is not necessary to provide a control valve for driving the movable disk 46 of the tensor 40, so that the structure is simple and the cost is low. When the fluid supply unit (branch path 50) is connected to the fluid supply path (pressurized air supply path 21) of the weft inserting nozzle 20, the on-off valve 2
If the connection is made between the weft insertion nozzle 20 and the weft insertion nozzle 20, the control valve becomes unnecessary and the same effect as above is obtained. Further, in the above-described embodiment, the case where the fluid of the weft inserting nozzle 20 and the pulling device 30 and the fluid that drives the movable disk 46 are each air is described. Water may be used, and the fluid that drives the traction device 30 and the movable disk 46 may be air, for example. Furthermore, when the pick tail is formed by joining the weft ends of the yarn feeder and the preliminary yarn feeder, the two weft ends are tied together, but the present invention is not limited to this, and they may be joined by an adhesive or the like. May be.

[0041]

As described above, the weft from the yarn supplying body is pulled out by the jet fluid of the weft inserting nozzle through the weft measuring and storing device, and the drawn weft is provided on the warp opening row side. When switching the preliminary yarn feeding body as a new yarn feeding body by pulling and removing the pick tail portion with the fluid from the pulling device, the holding body of the tenser is relatively separated by the driving means and the weft yarn is released. The weft yarn is quickly pulled out from the yarn feeder without receiving the resistance from the tensioner,
The towing removal operation is performed quickly. Further, if the driving means of the holding body is driven by a fluid and the fluid supply section of the driving section is connected to the fluid supply path of at least one of the pulling device and the weft inserting nozzle, the weft thread is pulled by the fluid. The sandwiching body can be driven, and the drive mechanism is simple and inexpensive.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the configuration of a tensor according to an embodiment.

FIG. 3 is an operation explanatory view illustrating a state in which a weft including a pick tail is blown up in a state in which a tensor of one embodiment is released.

FIG. 4 is an operation explanatory view illustrating a state in which a weft including a pick tail is taken in by a pulling device side in a state in which a tensor of one embodiment is released.

FIG. 5 is an explanatory view showing a state in which the preliminary yarn feeder of one embodiment is switched to a predetermined yarn feeding position, and pulling resistance is applied to the weft yarn by the tenser.

FIG. 6 is an operation explanatory view of the loom of the embodiment from stop to re-driving.

[Explanation of symbols]

 2 Turntable 8 Yarn supply body 9 Preliminary yarn supply body 10 Knot (pick tail portion) 12 Remaining yarn amount sensor 16 Weft length measuring storage device 18 Drum 20 Weft insertion nozzle 30 Traction device 32 Blowing nozzle 35 Traction pipe 36 Pressurized air supply Path (fluid supply path) 37 On-off valve 40 Tensor 42 Tensor stud 45 Fixed disk 46 Movable disk 47 Air passage 50 Branch path (fluid supply part) 52 Spring 54 Air chamber 61, 62 Speed controller

Claims (2)

[Claims] 1. A yarn feeder in which a pick tail portion is formed by joining a weft yarn end portion with a preliminary yarn feeder, and a tensor for sandwiching the weft yarn from the yarn feeder with a holding body to impart pulling resistance. And a weft measuring and storing device that stores the weft from this tensor by winding it around a drum by a winding arm, and draws out the weft that has been wound and stored around the drum of the weft measuring and storing device with a jet fluid and puts it in the warp opening row. A weft inserting nozzle for inserting and inserting the weft is provided, and the loom is stopped when the residual yarn amount of the yarn supplying body reaches a predetermined value, and the liquid is jetted from the weft inserting nozzle to pass through the weft measuring and storing device. Pulls out the weft from the yarn feeder, and further pulls and removes the weft including the pick tail portion by the fluid from the pulling device provided on the warp opening row side, and switches the preliminary yarn feeder as a new yarn feeder. Equipment The weft supply yarn of the jet loom, characterized in that, in association with the pulling and removing operation of the weft yarn including the pick tail portion, there is provided drive means for relatively separating the holding body of the tensor to release the weft yarn. apparatus. 2. The drive means includes a drive section that is driven by a fluid, and a fluid supply section that supplies the fluid to the drive section is connected to a fluid supply path of at least one of the traction device and the weft inserting nozzle. The weft yarn feeder for a jet loom according to claim 1, wherein