JPH06264332A - Weft-insertion apparatus for loom - Google Patents

Abstract

PURPOSE:To keep the posture of the tip end of a weft in good state at the side opposite to the weft-insertion side in the insertion of a weft by the drawing with a roller (feeding) and the traction with a fluid jet (posture control). CONSTITUTION:A weft Y is pulled with a pair of constantly rotating pulling rollers 33,35 by changing the path of the weft Y immediately before the rollers using a traverse lever 52. At the same time, air is ejected from a posture- controlling nozzle 71 to insert the weft Y. An assistant nozzle group 72 is arranged in the middle of the weft-insertion path and air is ejected from proper assistant nozzles 72 at least during the pulling action with the rollers 33,35 and after the ejection of air from the posture-controlling nozzle 71. Air is ejected from proper assistant nozzles 72 even after completing the pulling of the weft with the rollers 33,35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for weft insertion in a loom by pulling (sending) wefts by rollers and pulling (attitude control) by jet fluid.

[0002]

2. Description of the Related Art A conventional device of this type is disclosed in Japanese Patent Laid-Open No.
As disclosed in Japanese Patent No. 136237, a weft length measuring and storing device and a weft insertion nozzle (hereinafter referred to as an attitude control nozzle).
By providing a roller-type traction device between the and, by traction by the roller and traction by the jet fluid of the attitude control nozzle,
There is a thing that weft insertion.

Specifically, this roller-type traction device is provided with a pair of rollers that can be brought into and out of contact with each other, and draws the weft by rotating the roller while holding the weft between these rollers. When inserting the weft, the locking claws of the length measuring and storage device are pulled out and the fluid injection from the attitude control nozzle is started. Simultaneously with or slightly later than this, a pair of rollers are pressed into contact to clamp the weft and the rotation of the rollers is started. Then, the weft is inserted by pulling the weft. Then, the pair of rollers are separated from each other in the course of weft insertion, and thereafter, the weft yarn is pulled only by the jet fluid of the attitude control nozzle to end the weft insertion.

As described above, when the weft yarn is directly pulled by the roller, the energy loss is smaller than that in the case where the weft yarn is pulled only by the jet fluid, that is, the weft yarn is pulled by the friction between the fluid and the weft yarn. Further, since the posture control nozzle only needs to control the posture of the weft yarn to be pulled and delivered by the rollers, the flow rate can be greatly reduced, and the total energy consumption can be greatly reduced.

[0005]

However, in such a conventional weft inserting device, the attitude of the weft is controlled by the attitude control nozzle provided on the weft inserting side during the pulling by the roller, but the weft tip is After the portion has considerably run to the weft inserting side, the fluid jetted from the posture control nozzle diffuses on the weft inserting side, resulting in a decrease in the velocity of the weft tip portion and difficulty in maintaining the posture. Nevertheless, since the weft is delivered into the warp opening by the roller, the weft may become slack in the warp opening, and the weft may be entangled or caught on the warp, resulting in poor weft insertion. It was

Further, after the completion of pulling by the roller, even if the fluid is continuously ejected from the attitude control nozzle, the fluid ejected from the attitude control nozzle diffuses on the side of inserting the weft, and the weft yarn is in the warp opening as described above. There is a fear that the weft will be slackened, a weft insertion failure will occur, and the tension of the weft thread will disappear, resulting in deterioration of the fabric quality. In addition to increasing the injection pressure of the attitude control nozzle to control the attitude of the weft thread, it is also possible to ensure that the weft thread reaches the side opposite to the weft insertion side. It is difficult to use because the tension when locked is excessive and there is a risk of weft breakage.

In view of such circumstances, the present invention favorably carries out the weft insertion by the traction by the roller and the motive fluid by the jet of the attitude control nozzle while keeping the attitude of the weft yarn end portion on the side of the weft insertion good. An object is to provide a device that can perform.

[0008]

Therefore, the present invention relates to a weft inserting device of a loom for weft inserting a weft into a warp shed by pulling with a roller and with a jet fluid from an attitude control nozzle. The configuration is 1) or 2). (1) In the middle of the weft insertion path, an auxiliary nozzle that causes the jet fluid to act on the weft in the weft insertion direction is provided, and
A control device for ejecting fluid from the auxiliary nozzle for a predetermined period is provided at least after the ejection of the attitude control nozzle is completed while the roller is being pulled by the roller.

(2) In the middle of the weft insertion path, an auxiliary nozzle is provided for causing the jet fluid to act on the weft yarn in the weft insertion direction, and the fluid is jetted from the auxiliary nozzle for at least a predetermined period after the completion of the pulling by the roller. A control device is provided.

[0010]

In the configuration (1), the fluid ejection of the attitude control nozzle is stopped during the pulling by the roller, and thereafter, the orientation of the weft yarn end portion is controlled by the fluid ejection of the auxiliary nozzle in the middle of the weft insertion path. In the configuration of (2) in which weft insertion is preferably performed, after the pulling by the roller is completed,
The attitude of the tip of the weft yarn is maintained by the fluid injection of the auxiliary nozzle, so that the weft insertion is preferably performed and the weft yarn is held in a tension state.

[0011]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a system diagram of a weft inserting device showing an embodiment of the present invention.
Although this embodiment is provided with the A and B color weft inserting devices, since both weft inserting devices have the same configuration, the corresponding parts are designated by the same reference numerals, and the A color weft inserting device is mainly used. The device will be described.

The weft inserting device comprises a yarn feeder 1 to a tenser 2
Length measuring and storing device 10 for measuring and storing the weft yarn Y supplied through the yarn guide 2 and the yarn guide 2 for guiding the weft yarn Y from here.
1, 23 and a pair of pulling rollers 33, 35 capable of holding and pulling the weft Y between the yarn guides 21 and 23,
A switching device 50 provided between the yarn guide 21 and the pulling rollers 33, 35 for switching the path of the weft Y, and a yarn guide.
A braking device 60 capable of freely moving in and out of the weft Y from 23 and imparting running resistance to the weft Y, and this braking device 60.
Attitude control nozzle (main nozzle) 71 for flying the weft Y from the air jet while controlling the attitude of the weft Y, and an auxiliary nozzle that blows the tip of the weft yarn from the attitude control nozzle 71 one after another by the air jet. The group 72, a cutter device 80 provided in the vicinity of the tip of the attitude control nozzle 71, and a control device 100 for controlling the operation of these devices.

The length measuring and storing device 10 will be described in detail.
Comprises a body 12 having a drum 11. This body 12
A winding arm 13 is rotatably supported on the main body.
It is driven to rotate by the motor inside 12. The weft Y passes through the winding arm 13 and by the rotation of the winding arm 13,
It is wound and stored around the peripheral surface of the drum 11 which is held stationary. The stored weft yarns Y are locked by the locking claws 14 projecting into the holes on the peripheral surface of the drum 11 while
It extends to 21. The locking claw 14 is driven by an electromagnetically driven self-returning solenoid 15, and when the solenoid 15 is energized, the locking claw 14 is pulled out to release the lock on the weft Y, and the weft insertion is prevented. Done. Here, the solenoid 15 is controlled by a signal from the control device 100.

Each of the yarn guides 21 and 23 has a large diameter on the length measuring and storage device 10 side and is formed so as to have a gradually smaller diameter toward the downstream where the weft Y travels, and a predetermined position of the device provided on the downstream side. It is designed to guide the weft Y. As shown in FIG. 2, the larger diameter roller 33 of the pair of towing rollers 33, 35 is a drive shaft that protrudes through the vertical wall 27 of the motor 31 fixed to the vertical wall 27 of the fixed base 26. It is attached to a motor 32 and is rotated by a motor 31 in response to a signal from the control device 100 to rotate at a substantially constant speed during operation of the loom. A pair of small-diameter rollers 35 is arranged above the large-diameter roller 33. This small-diameter roller 35 is swingably attached to the vertical wall 27 and is attached to the spring 39.
The arm 36 is rotatably attached to the free end of the arm 36 and is pressed against the large-diameter roller 33 side. Then, by being sandwiched between the rollers 33 and 35, the weft Y
Is being towed.

FIG. 3 shows the power transmission of the pair of towing rollers 33, 35. These rollers 33, 35 are rotatably driven by the motor 31 when the peripheral surface of the large-diameter roller 33 and the peripheral surface of the small-diameter roller 35 are pressed against each other via the weft Y.
The driving force of 33 is transmitted to the roller 35 and rotated in the opposite directions at the same peripheral speed. The large-diameter roller 33 is made of metal, but at least the surface of the small-diameter roller 35 that comes into contact with the weft Y is made of soft rubber such as urethane rubber so as to enhance the frictional force with the weft Y. I am doing it. In addition, the rollers 33, 35 are driven by a switching device 50 described later.
A taper is formed on the take-in / out side so that the weft Y can be easily taken in and out. Further, in this embodiment, the colors A and B
The two color rollers 33, 33 are configured to be driven by a single motor 31, but are configured to be separately driven to rotate by using the two motors, as shown by a chain line in FIG. Good.

The switching device 50 includes a rotary solenoid 51. The rotary solenoid 51 is an electromagnetically driven self-resetting type that rotates the output shaft in one direction by energizing it and rotates the output shaft in the opposite direction by a spring when the energization is stopped to self-recover. As shown in FIG. 2, it is attached to the bottom wall 28 of the fixed base 26. The base end of the traverse lever 52 is fixedly attached to the output shaft located above the rotary solenoid 51. The tip of the traverse lever 52 is extended near the contact surface of the pair of pulling rollers 33, 35, and the extended end is bent upward, and the weft Y is inserted therein. 53 is formed.

FIG. 4 shows the traverse lever of the switching device 50.
The operation of 52 shows that the weft Y is drawn between the pair of pulling rollers 33, 35 and pulled out from between the pair of pulling rollers 33, 35. That is, when the traverse lever 52 of the switching device 50 is stopped at the position shown by the solid line by the self-return by the spring of the rotary solenoid 51, the weft Y is displaced from the route Y1 between the rollers 33 and 35 to the route Y2. Therefore, it is pulled out from between the rollers 33 and 35. Here, the rotary solenoid 51 is controlled by a signal from the control device 100.

As shown in FIG. 5, the braking device 60 is provided in the vicinity of the downstream side of the yarn guide 23 and is mounted on the fixed base 26 and the bracket 62. It is composed of an electromagnetically driven self-returning rotary solenoid 63 and a rod-shaped actuator 64 attached to the output shaft of the rotary solenoid 63. Here, when a signal from the control device 100 is not received, that is, when the rotary solenoid 63 is not electromagnetically driven, the operator 64 pushes the weft Y downward to cause the weft Y to move toward the edge of the yarn guide 23 by self-return. It presses against the weft yarn to give running resistance to the weft yarn (Y in FIG. 6).
2). When a signal from the control device 100 is received, the output shaft of the rotary solenoid 63 is rotated, whereby the operator 64 is separated from the weft Y, and the braking action is released (see FIG. 6). Y1). The brake device 60 may be provided in the vicinity of the upstream side of the yarn guide 23.

The attitude control nozzle (main nozzle) 71 is attached to the weft insertion side end of a reed holder (not shown) which holds the reed 3 and swings, and points to the warp shed. . Explaining the air supply path to the attitude control nozzle 71, a pressure tank 76 connected to a pressurized air supply source 74 via a pressure regulating valve 75 is provided. The discharge side of the pressure tank 76 is connected to the attitude control nozzle 71 via an electromagnetically driven self-reset type on-off valve 77. Then, the on-off valve 77 is opened and closed by a signal from the control device 100, and air is injected and stopped. By this injection, the weft Y, which is pulled by the pulling rollers 33, 35, flies to the opposite weft inserting side while controlling the posture.

The auxiliary nozzle group 72 includes, for example, three auxiliary nozzles.
The book is divided into blocks, and a plurality of blocks are provided along the reed 3. Each of the auxiliary nozzles is adapted to act the jet air obliquely on the weft Y in the weft insertion direction. Although not shown in the drawing, an air supply path to the auxiliary nozzle group 72 is provided with an electromagnetically driven self-restoration type on-off valve. These on-off valves open sequentially from the weft insertion side to the reverse weft insertion side in a predetermined opening period in response to a signal from the control device 100. As a result, the plurality of auxiliary nozzle groups 72 relay-injects the pressurized air so as to follow the flying tip of the weft Y, and the weft Y is sprayed by this relay injection.
Passes through the weft guide groove formed in the reed 3 and runs in the warp shed to be weft-inserted.

The cutter device 80 includes a cutter 81 fixedly provided on the cloth fell side and extending and attached in the front-rear direction.
It is composed of a rotary solenoid 82 for rotating the lower blade of the cutter 81, and the weft yarn Y beaten after weft insertion.
Is cut at the tip of the attitude control nozzle 71. On the other hand, on the side opposite to the weft insertion side of the warp row (not shown)
Weft arrival sensor 90 to detect the arrival timing of
Is provided. Then, the output signal of the weft arrival sensor 90 and the angle sensor 6 for detecting the rotation angle of the loom main shaft 5
And the output signal of are input to the control device 100.

The control device 100 is a loom body control device 101.
A weft selection command device 102, an actuator drive command generation device 103, and an inverter 104. Weaving machine control device 101 and weft selection command device 102
And the actuator drive command generating device 103 are electrically connected to each other, and the signal of the angle sensor 6 attached to the main shaft 5 of the loom is directly input to each of the devices 101 to 103. Therefore, each of these devices 101-103
According to the rotation angle of the loom main shaft 5 detected by the angle sensor 6, the independent operation is sequentially performed.

The weaving machine control device 101 is a weft arrival sensor.
In addition to signals from 90 and angle sensor 6, prepare button 121
, Signals from the start button 122 and the stop button 123, and an input device 124 for weaving conditions such as the number of rotations of the loom, the width of the weaving, the type of yarn
Signal from the loom is issued to control the start and stop of the loom main motor 7 by issuing a loom operating signal.
In addition to controlling the start and stop of the towing roller 33 drive motor 31 via the inverter 104 by issuing a roller rotation command signal, the actuator drive command generator 123 is also output a setting signal by determining the operation timing of each actuator. To do. The preparation button 121 is pressed first when the loom is operated, and thereby instructs the start-up of the inverter 104 of the motor 31 which takes time, for example, to reach a normal rotation speed. The start button 122 is a button that is pressed after a signal indicating that the loom is ready for operation is output, and thereby starts the loom main motor 7. The stop button 123 is for stopping the loom and can be pressed at any time if necessary.

The weft selection command device 102 instructs the actuator drive command generation device 103 which weft yarn (color A or color B) to be used for the next weft insertion in accordance with a pre-programmed sequence in multicolor weaving. . This instruction is output from about 300 degrees of the previous cycle at the spindle angle. The actuator drive command generation device 103 sequentially operates each actuator via a driver in accordance with a signal from the angle sensor 6. The main drivers are: the driver 15a is for operating the solenoid 15 of the locking claw 14 on the A color side, and the driver 15b is for operating the solenoid 15 of the locking claw 15 on the B color side. Similarly, the driver 51a operates the rotary solenoid 51 on the A side, the driver 51b operates the rotary solenoid 51 on the B side, the driver 77a operates the open / close valve 77 on the A side, and the driver 77b operates the B side. Open / close valve 77
The driver 82a for operation is for operating the rotary solenoid 82 of the cutter device 80.

Next, the operation of this embodiment will be described with reference to the time chart of FIG. FIG. 7 shows the operating state of each actuator when the loom is in steady operation, and shows a case where wefts of colors A and B are alternately inserted. However, since the operations of A color and B color are the same, only A color will be described. The tip of the weft Y has already reached the anti-weft insertion side in the state where the rotation angle of the loom main shaft 5 is just before reaching the beating time, and in this state, the measuring storage device 10 is locked. The claw 14 locks the weft Y and the attitude control nozzle 71 does not jet.
In addition, the towing rollers 33 and 35 are rotating, but the switching device
The weft Y is pulled out from between the pulling rollers 33 and 35 on the displacement path Y2 by the traverse lever 52 of 50. On the other hand, the brake device 60 is operating. Then, when the rotation angle passes 0 degree, the cutter device 80 operates to cut the weft Y near the tip of the attitude control nozzle 71.

When the rotation angle of the loom main shaft 5 reaches 60 degrees, the attitude control nozzle 71 starts air injection, but at this time, the weft Y is still locked by the locking claw 14 and does not fly. When the rotation angle of the loom main shaft 5 reaches 80 degrees, the locking claw 14 is pulled out from the drum 11 in the length measuring and storage device 10 and the locking to the weft Y is released. The pulling action causes the weft Y to start flying gently. At the same time, the braking action is released by the braking device 60. The auxiliary nozzle group 72 also starts relay injection from the weft insertion side.

When the rotation angle of the loom main shaft 5 reaches 100 degrees,
The traverse lever 52 of the switching device 50 is actuated, the weft Y is moved to the flight path Y1, is sandwiched between the pair of rotating towing rollers 33, 35, and is pulled, and the weft yarn Y is moved at a predetermined flying speed. Fly to the weft insertion side. Then, the weft Y is sent to the side opposite to the weft inserting side while the posture is controlled by the air injection of the posture control nozzle 71 and the auxiliary nozzle 72.

As described above, after the attitude control nozzle 71 starts to eject, the locking claw 14 of the length measuring and storing device 10 is pulled out, and the weft Y runs therethrough, and then the switching device 50 is operated to operate the pair of towing rollers 33. , 35 starts the weft pulling, so when the weft is clamped by the rollers 33, 35 that rotate constantly and receives a large pulling speed, the weft Y is already running to some extent and the relative speed difference is not so large, so it is smooth. Can be towed easily.

Then, the air injection of the attitude control nozzle 71 is stopped during the weft insertion (for example, 140 degrees), and thereafter, the attitude of the weft Y is controlled only by the relay injection of the auxiliary nozzle group 72. That is, the air jet of the posture control nozzle 71 is stopped during the pulling by the pair of pulling rollers 33, 35, and thereafter, the posture of the tip portion of the weft Y is controlled by the air jet of the auxiliary nozzle group 72. In FIG. 7, the auxiliary nozzle groups for injecting air after the end of the injection of the attitude control nozzle 71 during the pulling by the rollers 33, 35 are the third group and the fourth group. As a result, it is possible to maintain a good posture of the tip portion of the weft Y on the opposite weft insertion side while reducing the air consumption amount. Further, when the weft Y is locked by the locking claw 14 which will be described later, the ejection of the attitude control nozzle 71 has already stopped, and the attitude of the tip of the weft Y is maintained only by the auxiliary nozzle group 72. The tension of the weft becomes low and weft breakage can be prevented.

An unwinding sensor (not shown) provided in the vicinity of the locking claw 14 during weft insertion causes a weft yarn Y from the drum 11.
When the predetermined unwinding number is detected, the locking claw 14 immediately rushes into the hole on the peripheral surface of the drum 11. After the unwinding of about one winding from this plunge, the weft Y is actually locked by the locking claw 14 and the weft insertion is completed (about 220 degrees). Further, before the weft yarn Y is actually locked, the traverse lever 52 of the switching device 50 switches the weft yarn Y to the displacement path Y2 and pulls out the weft yarn Y from between the pulling rollers 33, 35 to substantially perform the pulling action. The brake device 60 is activated at the same time.

Then, when the weft Y is actually locked, a peak tension is generated, but the peak tension is remarkably low due to the operation of the brake device 60 optimally adjusted for a predetermined flying speed. The tension is suppressed, and the weft breakage prevention effect is further enhanced when the weft Y is locked. Here, the timing at which the traverse lever 52 of the switching device 50 pulls out the weft Y from between the pulling rollers 33, 35 is controlled based on the arrival timing of the weft Y detected by the weft arrival sensor 90.

That is, the arrival of the weft Y is the weft arrival sensor.
When detected by 90, the detection signal is input to the loom body controller 101 of the controller 100. This loom body controller
In 101, the detection signal input time of the weft arrival sensor 90 is converted into the rotation angle detected by the angle sensor 6, and the detected arrival timing which is the converted rotation angle,
The difference between the set arrival timing stored in advance as a reference value is calculated, and based on the difference, the traverse lever 52 of the traverse lever 52 obtained by the loom rotation speed and the weaving width input by the operator in the preparation work for the loom operation. The swing timing is corrected.

Further, even after the pulling by the pair of pulling rollers 33, 35 is completed, the posture of the tip portion of the weft Y is maintained by the air jet of the auxiliary nozzle group 72. In FIG. 7, the auxiliary nozzle group that injects air after the end of the pulling by the rollers 33 and 35 is the fourth nozzle group.
A group and a fifth group. As a result, the weft Y on the reverse weft insertion side
It is possible to improve the posture of the tip of the and keep it in a tensioned state.

In the present embodiment, the switching device 50 switches the pressure contact state to the pulling roller 33 by switching the path of the weft Y. However, a pair of constantly rotating rollers are pressure contacted in a rotating state. It may be switched so as to be separated.

[0035]

As described above, according to the present invention, the attitude of the weft yarn end portion in the warp yarn opening is controlled during or after the pulling by the roller, so that a suitable weft insertion can be performed. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a system diagram of a weft inserting device showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the above embodiment.

FIG. 3 is a side view of a main part of the above embodiment.

FIG. 4 is a plan view of an essential part of the above embodiment.

FIG. 5 is a perspective view of a brake device according to the above embodiment.

FIG. 6 is an explanatory view of the operation of the brake device according to the above embodiment.

FIG. 7 is an operation time chart of each actuator during the operation of the loom according to the embodiment.

[Explanation of symbols]

 1 Yarn feeder 10 Length measuring storage device 11 Drum 14 Locking claw 21,23 Yarn guide 31 Motor 33, 35 Traction roller 50 Switching device 52 Traverse lever 60 Brake device 71 Attitude control nozzle 72 Auxiliary nozzle group 100 Control device

Claims (2)

[Claims] 1. A weft inserting device of a loom in which a weft is pulled into a warp shed by pulling by a roller and jetting fluid from a posture control nozzle. And a control device for ejecting the fluid from the auxiliary nozzle for a predetermined period at least after the end of the ejection of the posture control nozzle while being pulled by the roller. Weft insertion device for loom. 2. A weft inserting device of a loom in which a weft yarn is inserted into a warp shed by pulling by a roller and a jet fluid from an attitude control nozzle, and a weft inserting device is provided in the middle of a weft inserting path to the weft yarn. A weft-inserting device for a loom, characterized in that an auxiliary nozzle that makes a jet fluid act in a predetermined direction is provided, and a controller that jets a fluid from the auxiliary nozzle is provided for a predetermined period at least after the pulling by the roller is completed.