JPH11256451A - Picking device in loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a roller pulling device and reduce a price. SOLUTION: This picking device in a loom has a weft-holding tool 91 installed between a roller pulling device 30 and a posture-controlling nozzle 71 so that the pulling by the roller pulling device 30 may be starred after allowing weft Y to be held by the weft-holding tool 91 and changing a changing means 50 to a pulling position to store a prescribed amount of the weft Y pulled out from a length-measuring and storing device by the roller pulling device 30 between the roller pulling device 30 and the weft-holding tool 91. The picking device also has a controlling device for opening the weft-holding tool 91 and inserting the weft Y into the opening of warp by a jetting fluid of a posture-controlling nozzle 71.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a roller pulling device for pulling a weft by a rotating roller between a length measuring and storing device and a posture control nozzle for performing fluid ejection. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion device for a weaving machine that performs weft insertion by switching between traction and non-traction, and to a device for improving the durability and cost of a roller traction device.

[0002]

2. Description of the Related Art As a weft insertion device of a loom, there is known a device in which a weft wound on a drum of a length measuring storage device is drawn out by a jet fluid from a weft insertion main nozzle and inserted into a warp shedding row. I have. In this apparatus, weft insertion can be performed at a high speed by a fluid, so that it is extremely excellent in terms of improving productivity. However, when the weft is pulled by, for example, air injection as a fluid, the weft is pulled by friction between the air and the weft, and thus the weft pulling efficiency with respect to the air consumption cannot be said to be high. In particular, when pulling out the weft wound on the drum of the length measuring and storing device, the weft is drawn while rotating around the drum, and the yarn path becomes almost conical when viewed from the drum side due to centrifugal force. In order to pull out the weft against the pull-out resistance generated by this centrifugal force, the weft insertion main nozzle needs to pull out the weft with a large traction force. Since the traction force is proportional to the air consumption, there is a problem that the air consumption is large, and therefore, how to reduce the air consumption is a major issue.

[0003] Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-18541, a weft is sandwiched and pulled between a pair of constantly rotating rollers between a length measuring storage device and a nozzle (posture control nozzle). There is a roller traction device that switches between traction and non-traction by the roller traction device by swinging movement of a traverse lever having a weft guide as a switching means. Thereby, the weft on the drum of the length measuring and storing device is pulled out by the roller pulling device, and the attitude control nozzle only needs to insert the warp opening row while maintaining the attitude of the pulled out weft. Since no traction force is required, energy consumption can be reduced.

[0004]

In recent years, looms have been increasingly operated at higher speeds at 1000 revolutions per minute or higher in order to improve productivity. (Traction speed) also needs to be extremely high. In other words, when the roller makes one rotation, the circumference of the roller is the amount of weft withdrawal, and the peripheral speed of the roller is the pulling speed of the weft, so that the weft required for one weft insertion can be drawn at high speed. , The rollers must be rotated at a very high speed. Here, for example, when the weaving operation is performed under the conditions of a weaving width of 1.9 m and a loom rotation speed of 1000 rpm, the angle at which the weft is released by the locking claw of the length measuring and storing device during one weaving cycle and the weft is inserted is 120 degrees. (Between 90 degrees and 210 degrees), the weft insertion time (sec) in one cycle is (60 seconds / 1000 rpm) × (120 degrees / 360 degrees)
= 0.02 (sec) On the other hand, if the circumference of the roller is assumed to be 0.3 m, there is no slippage between the roller and the weft, and the roller is towed during the entire weft insertion time, the 1.9 m weft is drawn out. 1.9 / 0.
2 = 6.33 rotations are required. That is, the number of revolutions per minute of the roller is (6.33 / 0.02) × 60 = 18990 (rpm). Note that the weft pulling by the roller pulling device is actually set shorter than the release time of the locking claw in consideration of the operation delay of the locking claw and the like, so that the rotation speed of the roller is 18990.
It is necessary to rotate faster than rpm. Therefore, it is conceivable to increase the circumference of the roller by increasing the diameter of the roller, to increase the weft withdrawal amount per rotation of the roller, and to reduce the rotation speed of the roller. In addition, the size and size of the roller are limited because the performance and maintainability are reduced.

For this reason, the rotational speed of the roller must be increased to an extremely high speed of about 19,000 or more per minute. In addition, since the loom usually operates for 24 hours in order to increase the production amount, the total number of rotations per day is more than 27.36 million rotations. Therefore, it is necessary to make the roller and the bearing of the motor with an expensive material with high precision. In addition, if a pair of rollers to be sandwiched is formed of a high-strength metal material, there is a problem such as damage to the weft, so one of the elastic members is made of rubber or the like, and this rubber member also rotates at an extremely high speed. In order to clamp the weft, appropriate considerations such as material, dimensional accuracy, and structure are required. As described above, a problem remains in that it is necessary to make the roller pulling device inexpensive and highly durable.

An object of the present invention is to improve the durability and cost of a roller pulling device.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention provides a first method.
A length measuring / storing device, a roller pulling device for pulling and pulling the weft from the length measuring / storing device by a rotating roller, and switching means for switching between a pulled position and a non-drawn position of the weft by the rollers of the roller pulling device. In the weft insertion device of a loom having an attitude control nozzle for inserting a weft drawn by the roller pulling device into a warp opening by fluid ejection to perform weft insertion by switching the switching unit to a pulling position,
Providing a weft gripper between the roller pulling device and the attitude control nozzle, and after causing the weft to be gripped by the weft gripper, switching the switching means to a pulling position to start weft pulling by the roller pulling device. Thus, a control device is provided that causes a predetermined amount of weft to be stored between the roller pulling device and the weft grasper, and then releases the weft grasper and inserts the weft into the warp opening by the ejection fluid of the attitude control nozzle. And Secondly, the weft gripper is provided on the lead holder integrally with the attitude control nozzle. Thirdly, the roller pulling device is characterized in that the position of the roller is set such that the weft from the length measuring and storing device is sent upward. Fourth, between the roller pulling device and the weft gripper, a storage plate having a bottom plate extending from the roller pulling device side to the weft gripper side, and a plate-shaped member extending upward from the bottom plate on the weft gripper side. The weft yarn provided and fed upward by the roller pulling device is stored in a substantially U-shape in the space above the storage means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a perspective view showing a main part of this embodiment, and FIG. 2 is a block diagram schematically showing the entire structure of a weft insertion device of a loom. 3 and 4 are operation principle diagrams of this embodiment, and FIG. 5 is a timing chart showing the operation of each device shown in FIG.

First, the overall configuration and the operation thereof will be described with reference to FIG. This example shows a case where the present invention is applied to a multicolor loom in which weft is inserted by using two wefts Y on the (A) side and the (B) side. This embodiment shows a case where weft insertion is alternately performed on the (A) side and the (B) side.

Here, the weft Y is passed from the yarn supplying body 1 through the tensor 2 to the length measuring and storing device 10, and further through the yarn guide 18, the switching means 50, the roller pulling device 30, and the storing means 20. , And further through the weft gripper 91 and the attitude control nozzle 71. Then, the operator presses the preparation button 1
By pressing 21a, the loom main body control device 121 of the control device 120 outputs a start command signal, a current of a predetermined frequency flows to the motor 31 of the roller traction device 30 from the inverter 124, and furthermore, the winding arm of the length measuring and storing device 10 13 is driven by a motor (not shown) to rotate the weft Y
And wrap it around. At this time, the weft Y on the drum 11
Is locked by a locking claw 14 inserted into the drum 11 and wound around the drum 11 and stored.

When the motor 31 of the roller pulling device 30 reaches a predetermined rotation speed, the loom main body control device 121 of the control device 120 outputs a preparation completion signal, and a display (not shown) indicates that the preparation is completed. When the operator confirms this display and presses the start button 121b, the loom main body controller 1
Reference numeral 21 outputs a start signal to the driver 7a, whereby the loom main motor 7 starts to start. The driving force of the main motor 7 drives a threshold shaft (not shown) via the belt 8 and the main shaft 5. The main shaft 5 has a gear 4
An angle sensor 6 composed of an encoder or the like is connected via the. Then, the main shaft angle of the loom is detected by the angle sensor 6 and the loom main body control device 1 of the control device 120 is detected.
21, a weft selection command device 122, and an actuator drive command generation device 123.

Simultaneously with the start of the loom main motor 7, the loom main body control device 121 outputs a loom operation signal to the weft selection command device 122 and the actuator drive command generation device 123. The weft selection command device 122 grasps the weft insertion cycle of the loom based on the signal from the angle sensor 6, alternately selects the (A) side and the (B) side weft yarn Y, and outputs the same to the actuator drive command generation device 123. I do. The actuator drive command generator 123 receives a signal from the angle sensor 6 and outputs a driver 15a, 1
5b, 51a, 51b, 77a, 77b, 91a, 91
b, 82a to output an operation command signal at a predetermined spindle angle.

Each actuator includes a driver 15
(A) corresponding to (a) and 15b, and (B) side electromagnetic solenoid 15, corresponding to drivers 51a and 51b (A)
Side, (B) side electromagnetic solenoid 51, driver 77a,
The on-off valve 77 on the (A) side and the (B) side corresponding to 77b, the electromagnetic solenoid 92 on the (A) side and (B) side corresponding to the drivers 91a and 91b, and the cutter device 80 corresponding to the driver 82a. An electromagnetic solenoid 82 and the like.

That is, the drivers 15a and 15b supply and cut off power to the electromagnetically driven self-return type electromagnetic solenoid 15 corresponding to the locking claw 14, so that the locking claw 14 is inserted into the drum 11 and the weft Y And the weft yarn Y can be unwound from the drum 11.

The drivers 51a and 51b are on the (A) side,
By supplying and shutting off power to the electromagnetically driven self-returning type rotary electromagnetic solenoid 51 corresponding to the traverse lever 52 on the (B) side, the output shaft is driven to rotate in one direction by the application of electromagnetic force. The output shaft is rotated and returned in the opposite direction by the spring force of the elastic body due to the force deenergization. Thereby, the weft guide 53 formed on the traverse lever 52 advances and retreats the weft Y between the drive roller 33 and the driven roller 35 of the roller pulling device 30, and switches between the pulled state and the non-drawn state. . In this embodiment, the electromagnetic solenoid 51 is an electromagnetically driven self-return type, that is, the output shaft is rotated by an electromagnetic force and the rotation is returned in the opposite direction by a spring force. However, the rotation is returned by an electromagnetic force instead of the spring force. You may do so.

The drivers 91a and 91b are connected to the (A) side,
By supplying and shutting off power to the electromagnetically driven self-return type electromagnetic solenoid 92 corresponding to the weft gripper 91 on the (B) side, the disk 93 of the weft gripper 91 releases and grips the weft Y. That is, when power is not supplied to the electromagnetic solenoid 92, the disk 93 grips the weft Y by a spring (not shown) built in the electromagnetic solenoid 92, and the disk is driven by the electromagnetic force against the urging force of the spring by the power supply. 93 releases the weft Y. Since the weft gripper 91 is a generally known device having a function of gripping and releasing the weft Y, detailed description will be omitted.

The drivers 77a and 77b are on the (A) side,
Power is supplied to and shut off from the on-off valve 77 of the attitude control nozzle 71 on the (B) side, and the on-off valve 77 is opened, whereby the pressure tank 76 is supplied from the pressurized air supply source 74 via the pressure control valve 75. The pressurized air stored in the nozzle
1 and the on-off valve 77 closes to stop the injection of the pressurized air.

The driver 82a supplies power to and cuts off power from the rotary solenoid 82 of the cutter device 80 provided on the weft insertion side, so that the cutter 81 cuts the inserted weft yarn Y. The sub-nozzle group 72 arranged for each block (five blocks in this embodiment) along the length of the reed 3 receives a pressurized air supply source 74 via a pressure tank (not shown). (5 blocks) and an air supply path via an electromagnetically driven self-returning on-off valve is connected. Each of the on-off valves in the air supply path of the sub-nozzle group 72 is sequentially opened with a predetermined opening and closing period from the weft insertion side to the opposite weft insertion side according to an output signal from the loom main body control device 121. Group 7
2 injects pressurized air from the weft inserting side to the opposite weft inserting side like a relay so as to follow the leading end of the weft Y, and the weft Y is guided by an air guide (not shown) formed on the reed 3 and the warp. Fly in the opening.

Further, a weft arrival sensor 110 is provided on the side opposite to the weft insertion side of the warp row (not shown), and an output signal of the weft arrival sensor 110 and an output signal of the angle sensor 6 are input to the main control unit 121 of the loom. Thus, the weft arrival timing is detected. Also, the loom main body control device 121
Calculates the difference between the detected weft arrival timing and a set arrival timing set in advance as a reference timing, and based on the difference, for example, when the arrival timing is later than a set value, the weft gripper 90 Advance the opening timing of the disc 91 or increase the set pressure of the pressure tank 76,
Correction such as increasing the injection pressure of the attitude control nozzle 71 is performed. When the loom is stopped, the worker presses the stop button 121c, and the loom main body control device 121 is pressed.
Then, a stop command signal is output, and the loom main motor 7 stops. At this time, after outputting the stop command signal of the loom main motor 7, the control device 121 outputs a stop command signal of the motor 31 of the roller pulling device 30 after a predetermined time, for example, 5 minutes. This allows for immediate restart
Since the motor 31 is rotating at a predetermined speed, the motor 31
The operation of the loom can be resumed immediately without waiting for the speed to rise.

FIG. 1 shows the switching means 50 and the roller pulling device 3.
0, storage means 20, weft gripper 91, attitude control nozzle 7
1 shows the external appearance of the periphery of the device. Here, the switching means 50,
The roller pulling device 30 and the storage means 20 are fixed bases 4 provided so as to protrude outside the side frames 45 of the loom.
6, the weft gripper 91 and the attitude control nozzle 71
Is integrally provided on a lead holder 3a that holds the reed 3, and swings integrally with the reed 3. As described above, since the weft gripper 91 is provided on the lead holder 3a integrally with the attitude control nozzle 71, it is possible to take a sufficiently large space of the storage means 20 between the roller pulling device 30 and the weft gripper 91. This enables the storage means 20 to be described later.
By making the yarn path of the weft Y stored in the upper space large and substantially U-shaped, more weft Y can be stored.

Although FIG. 1 shows the (A) side and the (B) side, since both are similar devices, the details will be mainly described on the (A) side. On the front wall 46a of the fixed base 46 located above the electromagnetic solenoid 51 of the switching means 50,
A yarn guide 18 for guiding the weft Y via a bracket 47 is provided, and the weft Y from the length measuring and storing device 10 shown in FIG. Also,
The weft Y from the yarn guide 18 is passed through a weft guide 53 of a traverse lever 52 attached to an output shaft of an electromagnetic solenoid 51.

The driving roller 33 of the roller pulling device 30
Is the motor 3 attached to the side wall 46c of the fixed base 46.
It is attached to one output shaft. A rubber layer 33a of urethane or the like is externally fitted on the peripheral surface of the drive-side roller 33 in a state where the diameter thereof is increased by elastic deformation. The durability and explosion-proof property, the reduction of damage to the weft Y, the frictional force with the weft Y are increased, and the rubber layer 33 is easily replaced when worn. On the other hand, the driven roller 3
Reference numeral 5 denotes a metal roller having a smaller diameter than the driving roller 33.
The traverse lever 52 is disposed obliquely above the driving roller 33 near the side of the traverse lever 52. As a result, the roller pulling device 30 sends out the weft Y from the length measuring and storing device 10 obliquely upward toward the weft gripper 91 side. The driven roller 35 has a pin 37 on the side wall 46c.
The driven side roller 35 is rotatably mounted on the arm 36 which is swingably mounted on the driven side roller 33 by a spring 39 which is hung between the side wall 46 c and the arm 36.
Is biased to the side. As a result, the driven roller 35 is pressed against the peripheral surface of the driving roller 33, and the driving force of the driving roller 33 rotated by the motor 31 is transmitted to the driven roller 35, and the driving roller 33 and the driven roller 35 are driven.
Rotate in opposite directions at the same peripheral speed. In addition, a taper is formed on the end surface of the driven roller 35 so that the weft yarn Y can easily enter and exit between the contact surfaces of the driving roller 33 and the driven roller 35.

The storage means 20 is composed of a plate-like member bridging the upper part of the front wall 46a on the switching means 50 side of the fixed base 46 to the upper part of the rear wall 46b of the weft grasper 91, and extends upward from the upper part of the front wall 46a. A bottom plate 20d is formed to extend between the driven side roller 35 and the driving side roller 33 of the roller traction device 30 and to extend substantially horizontally to the upper portion of the rear wall 46b. A press-contact portion between the driven roller 35 and the driving roller 33 of the bottom plate 20d is provided with a rectangular hole 20e.
When the traverse lever 52 of the switching means 50 is in the non-pulling position, the yarn path of the weft Y is located on the bottom plate 20d on the side of the hole 20e, and when moving to the pulling position, it moves from the bottom plate 20d to the hole 20e. , The driven roller 35 and the driving roller 3
Into the press-contact area between the three.

The storage means 20 is provided with a plate-like member 20f which is bent from the bottom plate 20d at the upper part of the rear wall 46b on the side of the weft gripper 91 and extends upward. This plate member 2
0f is composed of an upright plate 20a and an inclined plate 20a extending obliquely upward from the upper portion of the upright plate 20a toward the roller traction device 30 side. The upright plate 20a is located on substantially the same horizontal plane as the weft guide 94 provided immediately in front of the weft gripper 91 (upstream with respect to the traveling direction of the weft Y) and the weft introduction portion of the attitude control nozzle 71. Weft guide 20
c is formed. As a result, on the (A) side in the drawing, the weft Y pulled by the press-contact portion between the driven-side roller 35 and the driving-side roller 33 and sent out to the diagonally upper space as shown in FIG. A slack portion is formed diagonally upward as shown by a dotted line. At this time, the later-described weft gripper 91 is in a state of gripping the weft Y, and the slack portion is further expanded, and the bottom portion 20d, the upright plate 20a, the inclined plate 2
0b is stored in the space while drawing a substantially U-shaped arc (see FIG. 3 (c)). After that, when the disk 93 of the weft grasper 91 releases the weft Y, it is drawn out by the jet airflow of the attitude control nozzle 71 and inserted into the warp shedding row. As described above, since the roller position is set so that the weft Y from the length measuring and storing device 10 is sent obliquely upward toward the weft gripper 91, the roller pulling device 30 and the weft gripping device 30 are connected to each other. The weft Y can be stored in a substantially U-shape in the upper space between the containers 91, and the weft Y can be stored without the wefts Y getting tangled. Further, since the weft Y sent obliquely upward toward the weft gripper 91 by the roller pulling device 30 is stored in a substantially U-shape in the space above the storage means 20, the U-shape is formed. The stored weft yarn Y is the bottom plate 20d, the upright plate 20 of the plate member 20f.
a and the inclined plate 20b can reliably store the weft yarn Y without being tangled with another portion. Also, when the weft Y is started to pull much earlier than the weft insertion start time, the posture of the weft Y floating in the U shape in the air depends on the mass of the yarn and the state of fluff on the surface (frictional force against air). There is a possibility that a part of the control nozzle 71 may fall, but even in such a case, the bottom plate 20 d
The weft yarn Y is gently placed on the upper portion, and can be pulled out by the attitude control nozzle 71 and inserted into the warp opening without any trouble.

FIGS. 3 and 4 show details of the operation according to the above configuration.
The operation will be described with reference to the operation principle diagram and the timing chart of FIG. FIG. 5 shows an operation state of each device during operation of the loom based on the output of a command signal from the actuator drive command generation device 123 of the control device 120 to each actuator. The horizontal axis in FIG. Shows the rotation angle of.

The loom starts operating by pressing the start button 121b.
The signal is output when the button 21a is pressed, is always ON during the operation of the loom, and the motor 31 of the roller pulling device 30 shown in FIG. 1 is constantly rotating. The locking claw 14 is inserted into the drum 1 when it is inserted, and locks the weft Y. When the claw is pulled out, the weft Y can be unwound.

The traverse lever 52 is separated from the press-contact portion between the driven roller 35 and the drive roller 33 when it comes out, and is in a non-traction state. When it enters, it is inserted into the press-contact portion to be in a tow state. The weft gripper 91 is supplied with power when turned on, the disk 93 releases the weft Y, and when turned off, the power supply to the electromagnetic solenoid 92 is cut off. The disk 93 holds the weft Y. The attitude control nozzle 71 is
The air injection is performed when the signal is turned on, and the injection is stopped when the signal is turned off. However, the breeze air is constantly injected by an air pipe (not shown) so that the leading end of the weft Y does not fall out of the attitude control nozzle 71. The sub-nozzle group 72 includes
Each block of No. 5 is arranged in the weft insertion direction, and the air injection is performed when any of the blocks is ON, and the injection is stopped when OFF. Cutter 81 of cutter device 80 on weft insertion side
When the signal is turned on, the cutting operation is performed (cutter blade is closed), and when the signal is turned off, the blade is not cut (the cutter blade is opened).

In FIG. 5, (B) is a range from the left end 240 degrees of the main shaft angle shown on the horizontal axis to 0 degrees (360 degrees) toward the right.
The weft insertion cycle on the (A) side is from this point up to 360 degrees. First, the left end 240
In the degree, the weft gripper 91 on the (B) side is turned ON and the weft Y
Is released, but the weft Y on the (B) side is
4 and is not pulled out of the drum 11. That is, the weft Y on the (B) side is locked by the locking claw 14, and the weft insertion is completed. At this point, the fourth and fifth blocks on the side opposite to the weft insertion side of the sub-nozzle group 72 continue the air injection to apply tension to the weft yarn, thereby securing the quality of the woven fabric at the time of beating. The motor 31 of the roller traction device 30 is constantly rotating, but the traverse lever 52 on the (B) side is in a non-traction state.

Next, when the main shaft angle becomes 270 degrees,
The weft gripper 91 on the (B) side is turned off, grips the weft Y, and enters the state shown in FIG. Then, before the main shaft angle is 300 degrees, the length measuring claw 14 on the (A) side is
Traverse lever 52 at (A) side at 300 degrees
Is turned on and the state is switched to the towing state.
1 Pulled out from above. At this time, the unwinding sensor 16
Detects the unwinding number of the weft Y. Here, since the weft gripper 91 on the (A) side is in the OFF state and grips the weft Y, the yarn path of the weft Y starts to expand on the storage means 20, and is shown in FIG. State.

As described above, the features of this embodiment are as follows.
Before the weft Y on the (A) side is inserted into the warp shedding row, the weft Y on the (A) side is drawn by the roller pulling device 30 particularly from the time of the weft insertion cycle (300 degrees) on the (B) side. It is withdrawn from the length measuring storage device 10 and stored on the storage means 20.

Thereafter, the beating is performed at 0 degree,
At this time, the cutter device 80 operates to cut the weft Y on the (B) side inserted in the previous cycle.

After 0 degree, the weft insertion cycle on the (A) side is performed. When the main shaft angle reaches 80 degrees, the attitude control nozzle 71 on the (A) side starts air injection as shown in FIG. However, at this time, since the weft gripper 91 on the (A) side is OFF and grips the weft Y, the weft Y does not fly, and FIG.
As shown in (c), the yarn path of the weft yarn Y is formed so as to greatly expand in a U-shape on the storage means 20. Thereafter, the weft gripper 91 is turned on at the main shaft angle of 90 degrees to release the weft Y, whereby the weft Y stored in the space above the storage means 20 in a U-shape is pulled out by the attitude control nozzle 71. 4 (a). That is, the time when the weft Y is released by the weft gripper 91 is the timing of starting the weft insertion.

At this time, the weft Y is not drawn out from the drum 11 while forming ballooning, but is drawn out freely in the space above the storage means 20 and further pulled. Y is the drum 11
From the mass of the weft Y between the attitude control nozzle 71 and
Since it is only the mass stored near the attitude control nozzle 71, the traction force can be reduced, and therefore, the air injection pressure of the attitude control nozzle 71 can be reduced to reduce the air consumption.

Further, before the start of weft insertion, the weft yarn Y is drawn out from the length measuring and storing device 10 by the roller pulling device 30 and stored on the storage means 20 between the roller pulling device 30 and the weft holding device 91. The weft gripper 91
Is released and the weft insertion is started.
The weft Y stored above is drawn out by the attitude control nozzle 71 and inserted into the warp shedding row. Therefore, before the start of weft insertion, the roller of the roller pulling device 30 is pulled by the weft Y and stored. Can be slow. That is, the angle at which the conventional roller pulling device pulls the weft yarn Y is 120 degrees (between 90 degrees and 210 degrees), but in this embodiment, the roller pulling device 30 pulls the weft Y immediately after weft insertion. Is started, the traction time is about 270 degrees (between 300 degrees and 210 degrees) and more than twice as long, so that the roller speed can be at least 以下 or less. That is, assuming that the conventional roller rotation speed is approximately 19,000 rotations, the roller can be reduced to 95,500 rotations or less in this embodiment when the roller is pulled under the same weaving conditions. Therefore, it is not necessary to make the driving roller 33 and the driven roller 35 of the roller traction device 30 or the bearing of the motor 31 highly accurate or to use a highly durable one. The driving roller 33 and the driven roller 3
5 (in this embodiment, the driving roller 33)
The durability of the rubber layer 33a to be attached to the roller is also improved as the speed of the roller is reduced, and the material, dimensional accuracy, structure, and the like can be reduced.

Next, when the weft Y on the (A) side is inserted into the warp shedding row by the attitude control nozzle 71, the weft Y is sent to the opposite weft insertion side while the attitude is controlled by the relay injection of the sub-nozzle group 72. Can be Then, after the main shaft angle is 210 degrees, the traverse lever 52 on the (A) side comes out and switches to the non-traction state, and the state shown in FIG. Thereafter, at around 200 degrees, the unwinding sensor 16 detects the weft Y on the (A) side.
Is detected (for example, four windings are unwound), and the locking claw 14 is detected.
Is inserted into the drum 11. Then 1 for drum 11
At the point of time when the circumference has been disassembled (about 240), the locking claw 14
4C, and the weft insertion is completed.

Thereafter, when the main shaft angle is 270 degrees, the weft gripper 91 on the (A) side is closed, and the weft Y is gripped. Note that the timing of the closing is not necessarily set to 270 degrees after the completion of the weft insertion, especially in the case of the jump-over weaving in which the A side and the B side are alternately inserted.
Can be arbitrarily set until the next release of the weft of the locking claw 14 on the A side in accordance with the expansion / contraction state that differs depending on the yarn type, the twist return state when exposed to airflow, and the like. Next, the length measuring claw 1 on the (B) side before the main shaft angle is 300 degrees.
4 is pulled out of the drum 11, and at 300 degrees, the traverse lever 52 on the (B) side is switched to a pulled state, and the weft is pulled out from above the drum 11. At this time, since the weft gripper 91 on the (B) side is OFF and grips the weft Y, the yarn path of the weft Y starts to swell on the storage means 20. In this way, in the weft insertion cycle on the (A) side, the weft Y on the (B) side is pulled by the roller pulling device 30 and the storage means 2
Stored on zero.

After that, it is beaten at 0 degree and then 30
At this time, the cutter device 80 operates to cut the weft Y on the (A) side. Thereafter, the weft yarn Y on the (B) side is inserted. However, since the operation is the same as that of the above-described weft insertion cycle on the (A) side, the description is omitted.

[0038]

As described above, according to the present invention, a weft gripper is provided between the roller pulling device and the attitude control nozzle, the weft gripper grips the weft, and the switching means is provided. By switching to the traction position and starting the weft traction by the roller traction device, a predetermined amount of weft is stored between the roller traction device and the weft gripper, and then the weft gripper is released to release the weft by the injection fluid of the attitude control nozzle. Since a control device for inserting the weft into the warp shedding is provided, the weft from the length measuring storage device can be pulled out and stored before the start of weft insertion, and the roller speed of the roller pulling device can be reduced accordingly, for example, the weft in the previous cycle. If the traction is started by the roller traction device immediately after the loading is completed, it can be reduced to at least １ ／ or less of the conventional roller speed. Therefore, since the roller speed of the roller pulling device can be reduced, there is a special effect that the durability of the device can be improved and the cost can be reduced.

If the weft gripper is provided integrally with the attitude control nozzle on the lead holder, the space of the storage means between the roller pulling device and the weft gripper can be made sufficiently large. More weft yarns Y can be stored in a large space, and the weft yarns can be drawn out from the length measuring storage device and stored long before the start of weft insertion.

Further, if the roller pulling device sets the roller position so that the weft from the length measuring and storing device is sent upward, the weft is substantially U-shaped in the space above the roller pulling device and the weft gripper. The weft can be stored, and the weft can be stored without entanglement between the wefts.

Still further, between the roller pulling device and the weft gripper, a storage means having a bottom plate extending from the roller pulling device side to the weft gripper side, and a plate-like member extending upward from the bottom plate on the weft gripper side. If the weft sent upward by the roller pulling device is stored in a substantially U-shape in the space above the storage means, the weft stored in the U-shape is a bottom plate, a plate-like member. The weft can be stored without being tangled by contacting other parts. In addition, when the weft is started much earlier than the weft insertion start time, depending on the mass of the yarn and the state of the fluff on the surface (frictional force against air), the attitude control nozzle of the weft floating in the U shape in the air. There is a possibility that part of the side may fall, but even in such a case, the weft is placed softly on the bottom plate of the storage means, then pulled out by the attitude control nozzle without difficulty and inserted into the warp opening Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of the present invention.

FIG. 2 is a block diagram schematically showing the entire structure of a weft insertion device of a loom;

FIG. 3 is a diagram showing the principle of operation of the device shown in FIG.

FIG. 4 is an operation principle diagram of the device shown in FIG.

FIG. 5 is a timing chart showing the operation of the device shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Length measuring storage device 14 Engagement claw 20 Storage means 30 Roller traction device 33 Drive side roller 35 Follower side roller 50 Switching means 52 Traverse lever 53 Weft guide 71 Attitude control nozzle 91 Weft gripper 93 Disk 120 Loom main body control device 123 Actuator Drive command generator

Claims (4)

[Claims] 1. A length measuring and storing device, a roller pulling device for pulling and pulling a weft from the length measuring and storing device by a rotating roller, and switching between a pulling position and a non-pulling position of the weft by the rollers of the roller pulling device. In a weft insertion device for a loom having a switching means and a posture control nozzle for inserting a weft drawn by the roller pulling device into a warp opening by fluid ejection by switching the switching means to a pulling position, and performing weft insertion. A weft gripper is provided between the roller pulling device and the attitude control nozzle, and after the weft is gripped by the weft gripper, the switching means is switched to a pulling position to start the weft pulling by the roller pulling device. As a result, a predetermined amount of weft is stored between the roller pulling device and the weft gripper, and then the weft gripper is released, and the weft is warped by the jet fluid of the attitude control nozzle. Weft insertion device of a loom, characterized in that it comprises a control device for insertion into the mouth. 2. The weft insertion device for a loom according to claim 1, wherein the weft gripper is provided on the lead holder integrally with the attitude control nozzle. 3. The weft insertion device for a loom according to claim 1, wherein the roller pulling device sets the position of the roller so that the weft from the length measuring and storing device is sent upward. 4. A storage means having a bottom plate extending from the roller pulling device side to the weft gripper side and a plate member extending upward from the bottom plate to the weft gripper side between the roller pulling device and the weft gripper. The weft insertion device for a loom according to claim 2, wherein the weft thread provided and fed upward by the roller pulling device is stored in a substantially U-shape in a space above the storage means.