JPH09324344A - Weft feeder in loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the excessive feed of weft to be developed in ending its delivery operation by a length measurement device to deliver a specified amount of weft synchronously with the picking period of time in a loom so as to stabilize the winding tension for the weft in the length measurement device. SOLUTION: This weft feeder 1 is made up of a length measurement device 4 to deliver a weft 3 by intermittently pulling it from a yarn feed unit 10, a 1st nozzle 7 set up close to the downstream side from the yarn feed unit 10 and to jet a fluid toward the upstream side, a 2nd nozzle 8 set up on the downstream side from the 1st nozzle 7 and close to the upstream side of the length measurement device 4 and to jet a fluid toward the upstream side, and a controller 9 to control the jetting of the fluid for the 1st and 2nd nozzles 7, 8 (amounts or time and period of time) according to the operation of the length measurement device 4. In this case, the 1st and 2nd nozzles 7, 8 are actuated (the fluid is jetted) according to the weft pulling state by the length measurement device 4 to subject the weft 3 to a force opposite in direction to its delivery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft feeding device for a loom, which prevents excessive weft feeding.

[0002]

2. Description of the Related Art Generally, it is widely practiced to provide a balloon breaker, a leaf spring tensor, etc. on the weft insertion side and downstream of the yarn feeder. Further, in Japanese Patent Laid-Open No. 2-53936, Japanese Patent Publication No. 56-11779, and Japanese Utility Model Laid-Open No. 64-45182, an air nozzle for injecting air toward the upstream side is provided near the upstream side of the length measuring device to measure By ejecting the air nozzle at the end of weft thread pulling of the long device,
Back tension (tension in the direction opposite to the weft thread feeding direction) is generated to keep the weft thread winding tension constant.

[0003]

[Problems of the prior art] However, the weft yarn braking force by the air nozzle and the leaf spring sensor does not sufficiently act when the weft yarn is wound around the length measuring device, and the weft yarn is unwound from the yarn feeder for a while even after the weft yarn winding is completed. There was a problem. It is considered that this is because the inertia of the unwound weft yarn on the downstream side of the yarn feeder acts to act as a weft yarn pulling tension from the yarn feeder. In order to prevent this, it is conceivable that a larger braking force is generated at the end of weft winding around the weft fed from the yarn feeder than at the time of normal weft winding.

However, if an excessive braking force is generated by one member, the weft thread may be damaged and the thread may be broken, so that the braking force cannot be increased and, eventually, the slack of the weft thread can be eliminated. There wasn't. In particular, in a device in which the length measuring device is composed of a pair of rollers for sandwiching the weft thread and rotates the rollers by a predetermined amount when weft-inserting, the over-supply of this weft thread causes the winding tension to decrease at the next weft-inserting state. At the moment when the weft thread winds around the roller due to the wrapping with, the weft thread length unevenness occurs, and the slack part disappears, the weft thread tension rises sharply and thread breakage occurs on the yarn feeding side. There was a problem.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a length measuring device for feeding out a predetermined amount of weft yarn in synchronism with the weft insertion period of a loom, and prevent excessive weft yarn supply at the end of the feeding operation.
This is to minimize the slack of the weft thread and to stabilize the weft thread winding tension in the length measuring device.

[0006]

SOLUTION: A length measuring device for intermittently towing and feeding out a weft yarn from a yarn supplying body, a first nozzle provided near a downstream side of the yarn supplying body and ejecting a fluid toward an upstream side, A second nozzle provided downstream of the first nozzle and in the vicinity of the upstream side of the length measuring device for injecting fluid toward the upstream side; and the first nozzle according to the operation of the length measuring device; A weft supply device is configured with a controller that controls the injection amount or injection timing and injection period of the fluid from the second nozzle.

Here, the weft feed device causes the first nozzle and the second nozzle to jet at a predetermined jetting amount according to the weft pulling state of the length measuring device, and in a direction opposite to the weft feeding direction. By generating the action force of, the weft thread is prevented from being excessively supplied and the weft thread winding tension in the length measuring device is stabilized. The injection amount of the nozzle is determined by the injection flow rate or the injection pressure of the nozzle.

[0008]

1 shows a weft supply device 1 of the present invention together with a weft insertion device 2 of a loom. The weft inserting device 2 of the loom is provided between the length measuring device 4, the yarn feeder 10 and the length measuring device 4 for feeding out the weft 3 in a predetermined amount in synchronization with the weft insertion period of the loom. A balloon breaker 5 for restricting a balloon generated on the weft yarn 3 unwound from the yarn feeder 10 and a main nozzle 6 for inserting the weft yarn 3 delivered from the length measuring device 4 into the warp yarn opening 11 are provided. .

The weft supply device 1 is provided downstream of the balloon breaker 5 and in the vicinity thereof, and has a first nozzle 7 for injecting a fluid such as air 26 toward the upstream side, and a downstream of the first nozzle 7. Side and the upstream side of the length measuring device 4, and a second nozzle 8 for injecting a fluid, for example, air 26 toward the upstream side, and a first nozzle according to the operation of the length measuring device 4.
And a controller 9 for controlling the injection amount of the fluid from the second nozzle 8.

The length-measuring device 4 is moved by the rotation of the rotary roller to
The weft yarn 3 for the pick is measured and urged in the weft insertion direction, and has feed rollers 12 and 13 as a pair of rotating rollers that rotate in a state of sandwiching the weft yarn 3. One feed roller 13 of the pair of feed rollers 12 and 13 has a servo motor 14 as a driving means.
And the weft thread 3 is thereby rotated in the feeding direction. At the same time, the main nozzle 6 jets the weft yarn 3 into the warp yarn opening 11 and then beats it to form a cloth 23. In order to prevent slippage between the weft thread 3 and the peripheral surfaces of the feed rollers 12 and 13, the weft thread 3 is provided on one side, for example, the drive side feed roller 1
It is also possible to wind one or more turns around the peripheral surface of 3. By doing so, the accuracy of length measurement is improved.

A feed controller 16 inside the length measuring controller 15 is controlled by a loom state signal from a main control unit 17, and receives a crank angle signal as an output of an encoder 19 connected to a main shaft 18 of the loom as an input.
A rotation speed command is generated, which causes the servo motor 14
In addition to controlling the rotation of, the output is also output to the controller 9. The rotation of the servomotor 14 is detected by the pulse generator 20 and sent to the feed controller 16 as a feedback signal of the rotation amount.

The controller 9 receives the rotation speed command of the servo motor 14 as the output of the feed controller 16 and the loom state signal as the output of the main control unit 17, and inputs the first nozzle 7 and the second nozzle 8 to it. Injection control signal (pressure command and on / off command) to control
Is generated, which drives the injection control valves 21 and 22. As a result, the injection control valves 21 and 22 are connected to the pressure source 2
As the fluid supplied from 5 through the pipe 28, the pressure of the air 26 is adjusted to an appropriate pressure, and the pipe 28a is connected to the first nozzle 7 and the second nozzle 8 in accordance with the weft pulling state of the length measuring device 4,
Air 26 is respectively supplied via 28b. The main control unit 17 controls the entire operation of the loom such as weft-injection control of the weft-insertion nozzle 6 and warp thread tension control (not shown).

FIG. 2 shows the support state of the Baarn breaker 5 and the first nozzle 7. Balloon breaker 5
The first nozzle 7 is fixed on a stand 27 attached to the frame of the loom or the like. The first nozzle 7 is directed to the upstream side in the feeding direction of the weft thread 3, and is directed to the center hole of the balloon breaker 5. The weft yarn 3 supplied from the yarn feeder 10 passes through the center hole of the balloon breaker 5, the inside of the first nozzle 7, and the second yarn.
Reaching the nozzle 8 of. Although not shown, the second nozzle 8 is similarly attached to the frame of the loom by a stand or the like. Further, the weft thread 3 may not be inserted into the first nozzle 7 and the second nozzle 8 but may be arranged on the side of the weft thread 3 and ejected fluid toward the upstream side.

Next, FIGS. 3, 4 and 5 show an example of the injection control valve 21 or the injection control valve 22. In the specific example of FIG. 3, a pressure control valve or a pressure proportional valve 29 that operates according to a pressure command output from the controller 9 to the pipe 28,
An example is shown in which the on-off valves 30 that operate according to the on-off command are interposed in series.

In the concrete example of FIG. 4, the pipe 2 in a branched state is shown.
In this example, a switching valve 31 that operates according to a switching command is provided at the confluence position of 8 and a pressure control valve 32 is provided for each of a plurality of parallel portions of the pipe 28, and these are operated independently according to the respective pressure commands. Here, only one of the plurality of pressure control valves 32 operates according to the pressure command, and supplies the air 26 having an appropriate pressure to the switching valve 31. Here, the switching command functions as an on / off function.

Further, in the specific example of FIG. 5, a throttle valve 34 operated by a pressure command is interposed in one part of two pipes 28 in a parallel state, and a throttle valve 33 operated by a pressure command is operated in the other part. This is an example in which an open / close valve 35 that operates according to an open / close command is interposed. Here, the two throttle valves 33 and 34 supply the air 26 at an appropriate flow rate to the first nozzle 7 or the second nozzle 8 by changing the throttle amount, and the open / close valve 35 is necessary. At that time, a larger amount of air 26 is supplied.

Next, FIG. 6 shows an example of jetting in a running (weaving) state of the loom. (1) of FIG. 6 shows a state of beating after finishing the weft insertion. First nozzle 7
Is performing the small amount injection in the ON state, and the second nozzle 8 is in the OFF state and stops the injection. The feed rollers 12 and 13 of the length measuring device 4 are stopped with the weft thread 3 being sandwiched therebetween. Therefore, the first
Between the nozzle 7 and the pair of feed rollers 12 and 13, the weft thread 3 is linear with a weak tension due to a small amount of jetting from the first nozzle 7.

FIG. 6 (2) shows a state where the weft insertion is started. The first nozzle 7 is in the ON state and continues the small amount injection, and the second nozzle 8 is in the OFF state and stops the injection. The pair of feed rollers 12 and 13 of the length measuring device 4 rotate at high speed in the feeding direction (forward direction). Therefore, the weft thread 3 is fed in the direction of the main nozzle 6 by the forced pulling force of the pair of feed rollers 12 and 13 in a state in which a weak tension is applied by the first nozzle 7, and the weft insertion of the main nozzle 6 is performed. The jetting starts the flight toward the warp yarn opening 11.

FIG. 6 (3) shows the state immediately after the end of the weft insertion. Here, the controller 9 is the feed roller 1
By detecting the deceleration commands 2 and 13, the first nozzle 7 and the second nozzle 8 are both turned on for a predetermined period, a large amount of injection is performed, and braking of the weft thread 3 is started.
To prevent overfilling of the weft thread 3. Further, the pair of feed rollers 12 and 13 of the length measuring device 4 are stopped and sandwich the weft thread 3. Therefore, the pair of feed rollers 1
On the upstream side of 2 and 13, the weft yarn 3 is pulled in a direction in which it is pulled back by a large amount of jetting by the first nozzle 7 and the second nozzle 8 and is set in a state where it is not excessively supplied. After that, the loom returns to the beating state and the weaving motion is continued by repeating the above operation.

Next, FIG. 7 shows a state in which the loom is stopped. In this state, the first nozzle 7 is in the ON state and continues the small amount injection, and the second nozzle 8 is
Set to off state. Of course, the pair of feed rollers 12 and 13 of the length measuring device 4 are stopped. Therefore, as in (1) of FIG. 6, the weft thread 3 is sandwiched between the pair of feed rollers 12 and 13 in the stopped state,
On the upstream side, a small amount of jetting from the first nozzle 7 pulls it in the returning direction with a weak tension.

The balloon breaker 5 is a length measuring device 4.
When the weft yarn 3 is sent out, the weft yarn 3 is unwound from the yarn feeder 10 and regulates ballooning that occurs. The balloon breaker 5 may be separately provided on the upstream side of the first nozzle 7 or may be provided at the tip of the first nozzle 7, for example.

For comparison, FIG. 8 shows an example of a conventional device. In the conventional one, the first nozzle 7
Immediately before the start of weft insertion, the nozzle 8'corresponding to the second nozzle is turned on and jetting is performed. As a result, the weft thread 3 is loosened on the upstream side of the balloon breaker 5 and the nozzle 8 '. It is in a state.

By the way, the setting of the jetting amount of the first nozzle 7 and the second nozzle 8 is not particularly limited, and the jetting flow rate or the jetting pressure, etc., depending on the yarn type and the weft insertion speed (rotation speed of the loom). Is determined as a parameter. Further, the number of nozzles may be two or more. The injection (pressure / flow rate) settings are both set in the controller 9 and output to the injection control valves 21 and 22.

Next, FIG. 9 shows an injection pattern, that is, continuous injection, intermittent injection, or a combination of continuous injection and intermittent injection. As continuous injection (small amount injection / large amount injection), as shown in (1), the injection is continued for a certain period under a constant pressure (constant injection amount), and as shown in (2), the pressure is increased. It is conceivable that the pressure is continuously increased for a predetermined period while the pressure is sequentially increased, and the pressure is continuously decreased for a predetermined period as in (3). As the intermittent injection (small amount injection / large amount injection), as shown in (4), intermittent injection is continued under a constant pulse interval t1 and a constant rest interval t2, and further in (5). As shown in the figure, it is conceivable that the pulse interval t1 is gradually decreased or is increased successively (not shown) while keeping the pulse pause interval t2 constant. Further, as a combination of continuous injection and intermittent injection, as shown in (6), continuous injection is continued at a constant pressure for a predetermined period, and intermittent injection is performed at a higher pressure during each period. Things to add are possible.

Next, FIG. 10 shows a pair of feed rollers 1.
The injection timing and the injection period of the first nozzle 7 or the second nozzle 8 are shown corresponding to the rotational movements of 2 and 13. After the loom starts to operate according to the operation signal, the pair of feed rollers 12 and 13 continue to rotate at a predetermined speed for the weft insertion period. Due to the rising and falling characteristics of the servomotor 14, the velocity diagrams of the feed rollers 12 and 13 are trapezoidal. The rotation command to the servo motor 14 is given at the time of starting the weft insertion, and based on the falling characteristic of the servo motor 14, it ends slightly earlier than the time of ending the weft insertion.

Then, the first nozzle 7 or the second nozzle 8 has a predetermined period t after the end of the rotation command at the time of decelerating the feed roller, or prior to the deceleration of the feed roller, at the end of the rotation command. Predetermined period α
For a predetermined period t from an early point in time, for a predetermined period t from the time when the rotation command is generated during further feed roller acceleration, and before the further feed roller acceleration, for a predetermined period β before the time when the rotation command is generated. From then on, the small amount injection or the large amount injection is continued for a predetermined period t. The large amount of jetting generates a high tension on the weft thread 3 and is used to form a slack portion near the yarn feeder 10. In addition, a small amount of jet is the weft 3
, Which is used to generate back tension to the length measuring device 4.

Then, these injection periods are preset in the controller 9 based on the experience so far. By the way,
As described above, the loom status signal input to the controller 9 is a loom control signal, such as a loom operation signal, a weft insertion timing signal, and a length measurement control signal.
This is a rotation speed command of the servo motor 14. The controller 9 determines the state of the loom from the above signal to determine the injection amount,
A signal corresponding to the injection amount is sent to the injection control valves 21 and 22 to cause the first nozzle 7 and the second nozzle 8 to perform the necessary injection operation.

The injection control of the first nozzle 7 and the second nozzle 8 is performed in addition to the weft insertion while the loom is operating, for example, weft insertion performed when the loom is stopped (for example, when weaving), It may also be applied to the weft insertion error thread removing operation when the weft insertion error is detected, and is not limited to the operation during the loom operation.
Needless to say, the injection amount of the nozzle may be set according to the state of the loom.

Further, as another concrete configuration of the length measuring device 4, the following may be considered, for example. The example of (1) in FIG. 11 shows a pair of feed rollers 1 rotating at a constant speed.
This is an example in which the weft yarn 3 held by the bifurcated yarn guide 36 is brought into contact with or out of contact with the feed rollers 12 and 13 by the parallel movement (advance / retreat) of the yarn guide 36. Further, in the example of (2) of FIG. 11, the weft yarn 3 held by the yarn guide 36 is moved by moving the yarn guide 36 up and down (advancing and retracting) with respect to one feed roller 13 rotating at a constant speed. In this example, the outer peripheral surface of the roller is brought into contact with or not in contact with it. Further, in the specific example of (3) of FIG. 11, the yarn guide 36 is fixed,
The feed roller 12 on the upper side is moved down / up for each weft insertion, and based on this, the feed roller 13 rotating at a constant speed and the feed roller 12 for bringing the weft thread 3 into contact / non-contact with the feed roller 13. This is an example in which the weft thread 3 is sandwiched between and and the weft thread 3 is sent out.

In addition to the above-described rotary drum type length measuring device, a fixed drum type length measuring device, that is, a fixed drum, and a locking member that advances toward the fixed drum and locks the weft thread. A length measuring device is also conceivable in which a flyer is provided facing the fixed drum and a weft thread is inserted therethrough, and the weft thread is wound on the fixed drum while the weft thread is pulled out from the fryer by the rotation of the fryer. In addition to the length measuring device that winds the weft yarn for each pick, the weft yarns for several picks are wound in advance and the winding amount is detected. When the winding amount decreases due to weft insertion, the weft yarn is wound to compensate for this. It may be applied to a weft yarn length measuring device of a form.

[0031]

According to the present invention, by providing two or more nozzles, it is possible to disperse the action force due to the jet from the nozzle at the end of the weft yarn pulling of the length measuring device, and it is possible to use one nozzle as powerful as the conventional one. Since the jetting is not performed, the damage to the weft yarn due to the jetting can be reduced, and the slack portion of the weft yarn caused by the inertia of the weft yarn can be suppressed to the minimum length. Further, when the weaving machine is restarted, the weft thread tension does not sharply increase at the moment when the slack portion of the weft thread disappears after the start of weft thread pulling of the length measuring device, and thread breakage does not occur on the yarn supplying side.

[Brief description of drawings]

FIG. 1 is a block diagram of a weft supply device of the present invention.

FIG. 2 is a perspective view of a weft yarn path from the yarn feeder to the first nozzle.

FIG. 3 is a block diagram of an injection control valve.

FIG. 4 is a block diagram of an injection control valve.

FIG. 5 is a block diagram of an injection control valve.

FIG. 6 is an explanatory diagram of operating states of the first nozzle, the second nozzle, and the length measuring device in an operating state of the loom.

FIG. 7 is an explanatory diagram of operating states of the first nozzle, the second nozzle, and the length measuring device when the loom is stopped.

FIG. 8 is an explanatory diagram of operating states of a nozzle and a length measuring device in an operating state of a loom according to a conventional example.

FIG. 9 is an explanatory diagram of an ejection pattern of a first nozzle and the like.

FIG. 10 is an explanatory diagram of an injection timing and an injection period of a first nozzle and the like.

FIG. 11 is a front view of another example of the length measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weft yarn feeding device 2 Weft insertion device of a loom 3 Weft yarn 4 Length measuring device 5 Balloon breaker 6 Main nozzle 7 1st nozzle 8 2nd nozzle 9 Controller 10 Yarn feeder 11 Warp yarn opening 12 Feed roller 13 Feed roller 14 Drive Servo motor as means 15 Length measuring controller 16 Feed controller 17 Main control unit 18 Spindle 26 Air as fluid

Claims (2)

[Claims] 1. A length measuring device for intermittently towing and feeding out a weft yarn from a yarn feeder, a first nozzle provided near a downstream side of the yarn feeder and ejecting a fluid toward an upstream side, said first nozzle A second nozzle downstream of the first nozzle and near the upstream side of the length measuring device for injecting fluid toward the upstream side; and the first nozzle and the first nozzle depending on the operation of the length measuring device. And a controller for controlling the injection amount or the injection timing and the injection period of the fluid from the second nozzle, and injecting the first nozzle and the second nozzle in accordance with the weft thread pulling state of the length measuring device, A weft supply device for a loom, wherein a force is applied to the weft in a direction opposite to the weft supply direction. 2. The length measuring device is composed of a pair of rotating rollers for sandwiching the weft and a drive means for driving these, and the rotating roller is rotated when the weft is put in to feed out the weft and a predetermined amount of the weft is fed. 2. The weft supply device for a loom according to claim 1, wherein the weft supply device is configured to perform a length measurement operation in which the weft is stopped immediately after being fed.