JPH05179537A - Weft-measuring device - Google Patents

Abstract

PURPOSE:To furnish weft length-measuring unit which can omit the adjusting operation for the yarn feed drum, stop the yarn without trouble such as yarn breakage and measure the weft length with increased accuracy. CONSTITUTION:Reeling arm 2 which can rotatably follow the unwound yarn, and is equipped with a rotation angle sensor 3 and a microclutch brake 4 on its rotary shaft, is set between the yarn-feeding drum 1 where the yarn is unwound from the front end and the weft inserter for the yarn fed and the distance of weft flying is accurately calculated from the rotating angle of the reeling arm so that yarn feed may be stopped for staying.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft measuring device suitable for use in a shuttleless loom such as a rapier loom or an air jet room device.

[0002]

2. Description of the Related Art Generally, a weft yarn supplied to a shuttleless loom of this type is provided at the front end portion of a bobbin winding drum at the moment when the weft yarn unwound from the front end portion of the bobbin winding drum of a feeder device reaches a predetermined length. It was designed to stop the thread by operating a stopper such as a solenoid pin.

The winding drum of such a feeder device is
As shown in FIG. 5, the weft yarn Y supplied to the loom is fed to the drum 10
1 is wound around the rear part by a fryer 102 that circulates in the vicinity of the peripheral surface of No. 1, and protrudes, moves forward,
The weft Y that has been wound is sequentially conveyed forward by the carrier 104 that performs a square motion of immersion / retraction, and is wound around the entire drum surface. Here, when the winding of the weft Y is completed, the flyer 102 is quickly decelerated and stopped, and waits until the start of the next winding. On the other hand, the wound weft Y advances and is unwound from the front end of the drum, and is supplied to the shuttleless loom (not shown) by the weft inserting means 109 through the yarn hole 108. Then, when the remaining amount of the wound weft Y becomes equal to or less than a predetermined amount, the flyer 102 starts to rotate again, the weft Y is wound around the rear portion of the drum 101, and the above operation is repeated.

Here, the carrier 104 is rotatable (drum 10) on a bush whose base is inclined and eccentric with respect to the rotary shaft 106 of the fryer 102 and is fitted and fixed.
1 and carrier 104 are mounted non-rotatably).
Therefore, when the bush is rotated together with the rotating shaft 106, the carrier 104 that is rotatable with respect to the bush is, as indicated by a broken line, in accordance with the inclination and the eccentricity of the bush.
It is configured so that it can be swung back and forth while appearing and retracting from the peripheral surface of the drum, and the wound yarn 103 wound around the rear part of the drum can be advanced on the drum.

Further, the feed pitch of the carrier 104 is
The drum 101 is configured to be changeable by using an adjustment dial (not shown) at the front end portion of the drum 101, and can be adjusted appropriately according to the length and type of yarn of the yarn. And drum 1
The yarn unwound from the front end of 01 is fed to the weft insertion means 109 through a thread hole 108 coaxial with the central axis of the drum 101, and further, by the weft insertion means 109, a loom (not shown). It was supposed to be inserted to the side.

In the conventional weft length measuring device having such a structure, which one of the number of turns of the yarn counted by the optical sensor and the plurality of stoppers arranged at regular intervals around the front end of the winding drum is actuated? The weft length was measured by the remaining wrap angle determined by.

[0007]

In the above-described conventional weft length measuring device, the drum diameter must be changed and adjusted each time the weaving width changes, which is troublesome and the length measuring accuracy is insufficient. It is necessary to detect the number of turns by catching the yarn flying at high speed on the drum with an optical sensor, which requires advanced sensing technology. The yarn is unwound at high speed from the drum and the balloon state (unwound yarn is unwound) Since the stopper is operated for the yarn that is flying while swelling due to the centrifugal force, the yarn may be stepped on or thread breakage may occur. There is a large measurement error such as the installation interval of the stopper. In order to reduce the error, a large number of stoppers had to be installed densely, and there were many problems such as complexity and cost. A stopper (Japanese Patent Laid-Open No. 63-28946) that moves the stopper along the outer circumference of the bobbin drum to improve the length measurement accuracy has been proposed, but it has not been put into practical use at this time because the structure becomes complicated. ..

In view of the above points, the present invention provides a weft yarn length measuring device that does not require drum adjustment work, can stop yarn without fear of trouble such as yarn breakage, and can perform high precision length measurement. It is intended to be provided.

[0009]

To achieve the above object, the first structure of the present invention comprises a yarn feeding drum capable of unwinding from the front end, and a weft inserting means for wefting the fed yarn. The unwinding arm provided with a rotation angle detection sensor and a micro clutch brake is provided on the rotation axis of the unwinding yarn that can follow the unwound yarn, and the weft flying distance is determined from the rotation angle of the unwinding arm. Is calculated so that the yarn supply can be stopped and stored.

Further, in the first construction, the unwinding arm is provided with an impeller on its rotation shaft so that it can be rotated by air injection, and the unwinding arm is provided for the unwound yarn. It does not become a load resistance.
In the second configuration, between the yarn supplying drum that can be unwound from the front end and the weft inserting means for wefting the supplied yarn,
An unwinding arm that rotates following the unwound yarn is provided by an electric motor so that the unwinding arm does not become a load resistance.

In the second configuration, the electric motor is a stepping motor so that the rotation angle can be detected without using a rotary encoder. In the second configuration, the electric motor is a high frequency motor so that the release arm can be directly driven.

[0012]

The yarn unwound from the drum is sent out to the weft inserting means side through the yarn hole. At this time, the unwinding arm is pushed by the yarn rotating in the balloon state and rotates following it. However,
When the unwinding arm is configured so as to be synchronously driven by the air jet or the electric motor, the yarn is rotated at the same speed without applying a load to the yarn.

At this time, the rotation angle of the unwinding arm can be detected by the rotation angle detecting sensor attached to the unwinding arm, and the length of the unwound yarn can be accurately calculated from this angle. When the length of the delivered weft reaches a predetermined weaving width, the micro clutch brake is activated to stop the unwinding arm, so that the weft that has been accurately measured is delivered and stored. You can

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially sectional front view showing the overall configuration of the weft measuring device of the present application, FIG. 2 is a partially sectional front view showing an unwinding arm rotated by an electric motor, and FIG. 3 is a drive system of the unwinding arm and length measurement. A timing diagram for the system, FIG. 4 is a block diagram of the fryer drive system.

In the figure, 1 is a yarn feeding drum (barrel)
The yarn feeding drum 1 is rotatably supported by a driving portion 12 provided laterally on a base portion 11a of a fixed base 11 provided in an inverted L shape with respect to a drum shaft 13 extending parallel to an upper portion 11b of the base 11. It is pivotally supported. A flyer 14 is provided integrally with the drum shaft 13 on the rear side of the yarn feeding drum 1. The fryer 14 rotates together with the drum shaft 13 and feeds the weft Y passing through the yarn hole 15 of the fryer 14 into the yarn feeding drum 1. It is for winding around the circumference of.

The drive unit 12 is an inverter driver 1
A three-phase induction motor M capable of speed control by 2a is provided with a drive source, a main power supply 12b and a sub-power supply 12c which are two kinds of power supply means for the inverter driver 12a, and a control circuit 12d for these drive systems. I have it. Also,
The control circuit 12d receives signals from the full-winding sensor 41a and the thread breakage sensor 41b for notifying the winding state of the yarn supplying drum 1, and is connected to a control signal line for the inverter driver 12a (FIG. 5). ).

The main power source 12b is for supplying a main current required for the normal driving of the motor M, and is composed of a rectifier for converting a three-phase AC power source (200 V in this embodiment) into a direct current. That is, the rectifier output (270V) of the main power supply 12b is connected to the inverter driver 12a via the power element P and the fuse F.
Although a transistor is used as the power element P here, a relay circuit or a thyristor may of course be used as long as it can cut a direct current.

The sub power source 12c is connected to the motor M.
Is weakly urged in the normal rotation direction, and is composed of a low voltage circuit (12 V in this embodiment). The output of the sub power supply 12c is supplied via a backflow prevention diode D,
It is connected to the inverter driver 12a in parallel with the output of the rectifier of the main power source 12b. Here, the power element P of the inverter driver 12a and the main power source 12b
Is controlled by the control circuit 12d by the sensors 41a and 41b.
It is configured so that on / off control can be performed according to the output of.

That is, when the full winding sensor 41a detects the full winding, the control circuit 12d turns off the power element P of the main power source 12b to cut off the normal drive current, and the flyer 1
4 is decelerated and stopped. At this time, the low-voltage current of the sub power supply 12c is continuously supplied to the driver 12a, but since this current is weak, only a driving force which substantially opposes the reverse rotation of the flyer 14 due to the untwisting force of the weft Y is generated. I can't. Therefore, in this case, the fryer 14 will continue to stop without reversing.

The motor M is accelerated and decelerated by an inverter driver 12a within a predetermined frequency range so that the winding speed of the weft Y by the flyer 14 can be controlled to be constant. Reference numeral 2 denotes an unwinding arm, and the unwinding arm 2 is arranged at the front end portion of the yarn feeding drum 1 and is configured to be able to rotate following the weft Y to be unwound. That is, the unwinding arm 2 is made up of a rod-shaped member having a rotary shaft 21 coaxial with the drum shaft 13, and is constructed to be extremely lightweight as a whole, so that the unwound yarn is hardly loaded. , Can follow rotation. As shown in FIG. 1, the unwinding arm 2 may be provided with a hole 2a for inserting the weft Y, or may be a simple rod-shaped body.

Reference numeral 3 denotes an angle detection sensor (rotary encoder or the like) provided on the rotary shaft 21 of the unwinding arm 2.
Then, the length of the weft yarn Y sent out can be detected from the output of the sensor 3 (that is, the rotation angle of the unwinding arm 2). Here, if a high-resolution rotary encoder is used as the angle detection sensor 3, it is easy to measure the length of the weft Y with an accuracy of about 1 mm. Further, as an output of the sensor 3, a digital signal that can be easily processed can be obtained in almost real time, so that the control relating to the stopping and storing of the yarn can be performed quickly and accurately.

Similarly, a high frequency motor or a direct current motor may be used as the rotation urging means of the rotary shaft 21. In this case, the angle detection sensor should be attached to the rotary shaft 21 or the motor. If the motor used has excellent high-speed response, the motor can be directly coupled to the rotary shaft 21 to realize a simple structure. Reference numeral 4 denotes a micro clutch brake, which is also provided on the rotary shaft 21 of the unwinding arm 2. The brake 4 is for stopping the unwinding arm 2 according to the output of the sensor 3, and the length of the weft yarn Y fed from the yarn feeding drum 1 has reached a length corresponding to the weaving width. The weft yarn Y is configured to be activated at a time point and to be able to instantaneously stop the delivery of the weft yarn Y. As described above, the unwinding arm 2 has a light weight, and the mechanical brake can respond very quickly.

The unwinding arm 2 is constructed so that it can be easily followed and rotated by the tension of the weft Y, but it may be constructed so that it can be rotated more positively by providing a rotation urging means. Good. For example, in the embodiment shown in FIG. 1, air jet is used as the rotation urging means, and the blade 2 is attached to the rotary shaft 21.
1a is provided, and air is jetted toward the blades 21a by the air jet nozzles A and B, so that the rotary shaft 21 is rotationally biased.

In the embodiment shown in FIG. 2, a stepping motor is used as the rotation urging means. The stepping motor 21b is arranged such that its main shaft is parallel to the rotary shaft 21, and the timing pulley 22a, It is linked to the rotary shaft 21 at a speed increasing ratio of 1:10 via a timing belt 22b and a timing pulley 22c. In this case, since the rotation angle of the rotary shaft 21 can be easily calculated from the drive command pulse sent to the stepping motor 21b, it is not necessary to provide the rotary shaft 21 with an angle detection sensor.

Further, a high frequency motor may be used as the rotation urging means of the rotary shaft 21. In this case, utilizing the high-speed response, the rotary shaft 21 can be coupled by the direct drive method, and there is an advantage that the drive system can be simplified. However, it is necessary to provide the rotation angle detection sensor at an appropriate place in the rotation system. Reference numeral 5 denotes a gripper, which is used to hold the weft yarn immediately before the flight, and is arranged behind the unwinding arm 2 and in front of the weft inserting means 6.

The weft-inserting means 6 is for weft-inserting the weft without a shuttle. In this embodiment, an air jet loom is used. (Timing diagram) Below, the unwinding arm 2
With respect to the drive system and the length measurement system, the operation timings of the encoder 3, the clutch brake 4, the gripper 5, the air jet nozzles A and B, and the weft insertion means 6 will be described with reference to the timing diagram of FIG.

First, at the position of "loom rotation angle = 0 °", only the clutch brake 4 and the gripper 5 are in operation, and all other elements are inoperative. That is, the weft yarn Y to fly to the loom is on standby, and unwinding from the yarn feeding drum is not performed. Naturally, the unwinding arm 2 is also stopped. Next, at the position of “loom rotation angle = 90 °”, at the moment when the clutch brake 4 and the gripper 5 are turned off, the weft insertion means 6 is operated and the weft Y is caused to fly / weft. At the same time, the air jet nozzle A injects air toward the blades 21a of the rotary shaft 21, the unwinding arm 2 rotates, and the angle counting by the encoder (angle detection sensor) 3 is started.

At the position of "loom rotation angle = 180 °", the clutch brake 4 and the gripper 5 are simultaneously operated to hold and stop the weft yarn Y. However, at this time, in order to prevent the looseness of the weft yarn Y, the injection of the weft insertion means 6 is continued for a while. At this moment, the jet of the air jet nozzle A is stopped, and the counting by the encoder (angle detection sensor) 3 is finished.

Then, at the position of "loom rotation angle = 450 °", the same state as the above "loom rotation angle = 0 °" is reproduced, and the next weft flight is started in the same manner.

[0030]

As described above, according to the first structure of the present invention, the unwinding device is provided between the yarn feeding drum capable of unwinding from the front end portion and the weft inserting means for wefting the fed yarn. The unwinding arm that can rotate following the twisted yarn and that has a rotation angle detection sensor and a micro clutch brake is provided on the rotation axis, and the flight distance of the weft is accurately calculated from the rotation angle of the unwinding arm. It is possible to stop and store the yarn supply.

Further, in the first construction, the unwinding arm is provided with an impeller on its rotating shaft so that it can be rotated by air injection, and the unwinding arm is provided for the unwound yarn. It is possible to prevent it from becoming a load resistance. The second structure of the present invention follows the yarn unwound by the electric motor between the yarn feeding drum capable of unwinding from the front end and the weft insertion means for wefting the fed yarn. It is possible to provide a rotating unwinding arm so that the unwinding arm does not become a load resistance.

In the second configuration, the electric motor may be a stepping motor so that the rotation angle can be detected without using a rotary encoder. In the second configuration, the electric motor may be a high frequency motor so that the release arm can be directly driven.

As a result, no mechanical adjustment is required even if the flying length of the weft is changed, and the weft is measured with high accuracy.
Further, it has an excellent effect that a weft length measuring device capable of storing at a correct timing can be realized.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing the overall configuration of a weft measuring device of the present application.

FIG. 2 is a partial cross-sectional front view showing an unwinding arm rotated by a stepping motor.

FIG. 3 is a timing diagram regarding the drive system and the length measurement system of the unwinding arm.

FIG. 4 is a block diagram of a fryer drive system.

FIG. 5 is a principle configuration diagram of a conventional device.

[Explanation of symbols]

 1 yarn feeding drum 2 unwinding arm 2a yarn hole 3 rotation angle sensor (rotary encoder) 4 micro clutch brake 5 gripper 6, 109 weft insertion means (air jet loom) 11 substrate 12 drive unit 12a inverter driver 12b main power supply (rectifier) 12c Sub power supply (low voltage circuit) 12d Control circuit 13 Drum shaft 14 Flyer 15 Thread hole 21 Rotating shaft 21b Stepping motor 22a, 22c Timing pulley 22b Timing belt A, B Air jet nozzle Y Weft M 3-phase motor F Fuse P Power element D Backflow prevention diode 101 Yarn supply drum 102 Flyer 104 Carrier 106 Rotating shaft 108 Thread hole

Claims (5)

[Claims] 1. A yarn feeding drum capable of being unwound from the front end and a weft inserting means for wefting the fed yarn can follow the unwound yarn and rotate about its rotation axis. A weft length measuring device comprising an unwinding arm provided with an angle detection sensor and a micro clutch brake. 2. The weft yarn length measuring apparatus according to claim 1, wherein the unwinding arm is provided with an impeller on its rotation shaft so as to be rotated by air jet. 3. An unwinding arm, which is rotated by an electric motor so as to follow the unwound yarn, is provided between a yarn feeding drum that can be unwound from the front end portion and a weft insertion means that wefts the fed yarn. A weft measuring device characterized by being provided. 4. The weft yarn length measuring apparatus according to claim 3, wherein the electric motor is a stepping motor. 5. The weft yarn length measuring apparatus according to claim 3, wherein the electric motor is a high frequency motor having a rotation angle detection sensor.