JPH09158008A - Weft tension-imparting device of loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weft tension-imparting device of a loom for holding the counter-supply side end of a picked weft and imparting a tension to the weft, capable of imparting a proper tension in response to the kind of the weft to stabilize the quality of a woven fabric to be produced. SOLUTION: In a fluid jet loom 1, the end of a picked weft 7 is held with a holding mechanism 3 on the counter-supply side of the weft. In order to bend the weft 7 with a tension-imparting mechanism 4 between the holding mechanism 3 and warps 9 to impart a proper tension to the weft, the tension-imparting mechanism 4 is driven with a controller 5 in response to the kind of the picked weft 7 to change the bending degree of the weft 7, thus enabling to impart a proper tension to the weft 7 in response to the kind of the weft 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for applying an appropriate tension to a weft yarn in a fluid injection type loom on the side opposite to the weft yarn side according to the type of yarn.

[0002]

2. Description of the Related Art Generally, in a fluid jet loom, the front end portion of the weft thread inserted into the warp thread opening is in an unrestrained state at the time when the weft insertion is completed, so that the weft thread is engaged on the yarn supplying side. When stopped, a rebound phenomenon occurs due to the inertial force of the weft thread, and the weft thread is in a low tension state. If the weft thread is beaten in this state, weaving defects such as looseness of the weft thread in the woven cloth or loosening of the selvages in the selvages occur due to the low tension. In addition, the tension of the wefted yarn is not uniform over the entire length, which causes a problem that the texture of the woven fabric is deteriorated.

As a method for solving these problems, generally, a catch cord is used, and the weft yarn that has been wefted is supplemented by the catch cord on the anti-feeding side by the catch cord and entangled so that an appropriate tension is applied to the weft yarn. Granting is done. However, in the case of weaving a woven fabric using the strongly twisted yarn, the above-mentioned problem still occurs because the weft yarn is less likely to be entangled with the catch cord due to the elasticity of the yarn and the irregularity at the time of weft insertion. Also, the catch cord must be disposed of as a waste ear after use, which is very uneconomical. In addition, there is also a problem in that a large amount of waste disposal is required for the disposal process for discarding waste ear, which is a very complicated work. As means for solving such a problem, the "weft end catching device in a shuttleless loom" of Japanese Utility Model Laid-Open No. 61-20584 drives a weft catching plate by an actuator (pulse motor),
The weft thread is bent by the cooperation of the capture plate and the reed wing to give an appropriate tension.

[0004]

2. Description of the Related Art According to the above-mentioned "weft yarn end catching device in a shuttleless loom", it is only proposed to apply a constant tension to all weft yarns. Therefore, when weaving a fabric using multicolored weft threads, it is not possible to apply an appropriate tension to all the weft threads. Therefore, some yarns are woven into the woven fabric with an inappropriate tension, which causes quality problems such as poor texture of the woven fabric.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a weft thread tension applying device for holding the end of the weft thread on the side opposite to the feed side and applying tension to the weft thread. It is to stabilize the quality of the woven fabric by applying various tensions.

[0006]

According to the present invention, in a fluid jet loom, the present invention holds an end portion of a weft thread wefted in by a holding mechanism on the anti-feeding side, and In order to bend the weft thread by the tension applying mechanism and apply an appropriate tension, the controller controls the tension applying mechanism according to the type of the weft thread that has been put in to change the degree of bending of the weft thread. The appropriate tension is applied to the weft thread according to the type of weft thread.

[0007]

1 and 2 show the arrangement of a main part of a fluid jet loom 1 and a holding mechanism 3, a tension applying mechanism 4 and a controller 5 as constituent parts of a weft thread tension applying device 2 of the present invention. Is shown. In this embodiment, the weft insertion nozzle 8 and the feeler 14 are fixed to a loom frame (not shown), and the holding mechanism 3 and the tension applying mechanism 4 are also fixed to the loom frame.

The weft yarn 7 is put into the opening 10 of the warp yarn 9 by the weft insertion nozzle 8, beaten by the reed 11 before weaving, and cut by the cutter 13 on the non-feeding side to obtain the woven fabric 12. Become. The weft-inserted weft yarn 7 is detected by the feeler 14 on the non-feeding side and is sent to the weft yarn detector control device 15 as an electric weft yarn arrival signal.

When the weft yarn 7 is loaded, the weft yarn tension applying device 2 of the present invention applies an appropriate tension to the weft yarn 7 in accordance with the yarn type. That is, the holding mechanism 3 is constituted by, for example, a clamper that can be opened or closed electrically or mechanically, and holds the end portion of the weft yarn 7 that has been wefted in on the anti-feeding side. The end of the weft yarn 7 on the anti-feeding side is drawn into the inside of a suction pipe 16 for the selvage treatment provided at the outermost position on the anti-feeding side by the suction air flow and cut by the cutter 13. After that, the yarn is discharged to the yarn waste disposal position.

Further, the tension applying mechanism 4 is a portion for applying an appropriate tension to the weft thread 7 by pulling the weft thread 7 in the weft insertion direction while bending the weft thread 7 between the holding mechanism 3 and the warp thread 9. Depending on the type of weft thread 7 wefted in,
It is adapted to be driven by a controller 5 which changes the bending degree of the weft thread 7.

FIGS. 3, 4 and 5 show an example in which the tension applying mechanism 4 is constituted by a pair of fixed guides 17 and a rotary guide 18 rotatable inside the fixed guides 17.
The pair of fixed guides 17 are wedge-shaped when viewed from the direction of FIG. 3 and are semi-circular when viewed from the directions of FIGS. 4 and 5, and face each other while forming a guide slit 19 that guides the weft thread 7. . Further, the rotation guide 18 is connected to the rotor shaft of the motor 6 in a concentric position of the pair of fixed guides 17 and with a holding slit 20 which is slightly larger than the guide slit 19 formed, in any direction. Is also rotatable.

Then, the controller 5 controls the weft thread arrival signal from the weft thread detector controller 15 and the weft thread selector 21.
By picking up the weft yarn selection signal from the machine, the motor 6 is rotated, and the end of the weft yarn 7 wefted in by the tension applying mechanism 4 is bent while being bent on the anti-feeding side to pull the weft yarn 7 at an appropriate tension. Is given.

The weft yarn 7 that has been wefted is carried to the cloth fell side by the beating motion of the reed 11. At this time, the end portion of the weft yarn 7 on the non-feeding side is guided to the tension applying mechanism 4, and enters the holding slit 20 of the rotation guide 18 through the guide slit 19 between the pair of fixed guides 17. When the weft yarn feeler 14 detects the weft yarn 7, the weft yarn detector control device 15 gives a tension applying operation command to the controller 5 or the like by a weft yarn arrival signal. In addition,
This tension application command is replaced with the weft thread arrival signal,
In order to carry out at a predetermined crank angle, an angle signal may be used as a command to start the tension applying operation.

First, the suction pipe 16 and the holding mechanism 3 operate, and the suction pipe 16 sucks the end portion of the weft thread 7 by the suction air flow, and the holding mechanism 3 is arranged between the suction pipe 16 and the tension applying mechanism 4. Then, the weft thread 7 is held and clamped.

Next, the controller 5 controls the weft thread selecting device 21.
The weft thread selection signal is fetched, the motor 6 of the tension applying mechanism 4 is driven according to the selected thread type, and the rotation guide 1
By rotating 8 by a predetermined rotation angle or by applying a predetermined torque to the rotation guide 18, the weft yarn 7 is pulled while being bent, and the weft yarn 7 is given an appropriate tension according to the yarn type. As a result, when the weft yarn 7 is beaten by the reed 11, the weft yarn 7 is woven into the woven fabric 12 with an appropriate tension. After that, the end of the weft yarn 7 is cut by the cutter 13, and then the clamper of the holding mechanism 3 is opened, so that the weft yarn 7 at the separated end is discharged by the suction pipe 16 as waste yarn.

[0016]

[Specific Example of Controller] FIG. 6 shows a specific example of the controller 5 of the rotation amount (position) control system. Controller 5 of this specific example
Is an example in which the motor 6 of the tension applying mechanism 4 is rotated by a preset amount of rotation to apply a tension to the weft thread 7 in accordance with the thread type. The target rotation amount is set by the target rotation amount setting device 22 according to the yarn type, and a pulse signal indicating the target rotation amount is sent from the target rotation amount generator 23 to the polarity reversing device 24 in accordance with the weft yarn selection signal. After that, it is given to the deviation counter 27. The polarity inverter 24 sets the deviation counter 27 in the forward rotation direction when receiving the weft thread arrival signal from the OR circuit 26, and sets the deviation counter 27 in the reverse rotation direction when receiving the timing signal from the timing signal generation circuit 25. Set to.

The pulse as the deviation output of the deviation counter 27 is converted into an analog signal by the D / A converter 28 and drives the motor 6 via the driver 29. Motor 6
The rotation of is detected by the encoder 30 and fed back as a subtraction signal of the deviation counter 27. The current detector 31 detects the current of the motor 6 when the tension is applied. The determiner 32 determines whether the tension of the weft thread 7 at this time is good or bad, and outputs a stop signal to the loom to stop the loom when an abnormality occurs. The timing signal generation circuit 25 is provided at a predetermined timing after the tension is applied and after the beating.
Outputs a timing signal. As a result, the target rotation amount generator 23 again outputs a pulse signal indicating the same rotation amount, and the polarity inverter 24 inverts the polarity. As a result, the motor 6 is driven in the reverse rotation direction and returns to the initial position.

The specific example of FIG. 7 is an example of controlling the torque of the motor 6. An appropriate torque is preset by the torque setting device 33 according to the type of the weft yarn 7 and is sent to the torque command device 34. When the weft thread arrival signal is generated, the torque command device 34 starts its operation and outputs the torque command according to the weft thread selection signal to the driver 35.
And drives the motor 6 with a torque according to the yarn type.

In this specific example, a stopper (not shown) is provided near the motor shaft so that the tension applying mechanism 4 is stopped at the origin position. The stopper is released by the generation of the weft thread arrival signal, and the tension applying operation is started. After cutting the weft thread 7, the stopper is returned so that the rotation guide 18 of the tension applying mechanism 4 stops at the original position again. The stopper controls to release and return at a predetermined loom crank angle.

[0020]

[Other Embodiments] In the above-described embodiment, the weft insertion nozzle 8 is fixed to the loom, but separately from this, the wed insertion nozzle 8 is fixed to the sley and swings together with the reed 11. The model may be used. In this case, the tension applying mechanism 4 and the holding mechanism 3 are also of a type that is fixed to the sley and swings together with the reed 11.

Further, as a construction for giving a bending to the weft thread 7, instead of a configuration in which the weft thread 7 is bent by rotation, as in the above-mentioned prior art, the weft thread 7 is bent by a catching plate and a reed or other member. It may be configured to allow it. In this case, the amount of movement of the catch plate is changed to change the degree of bending of the weft thread and the tension thereof is controlled.

[0022]

According to the present invention, in the weft insertion process, an appropriate tension can be applied on the non-feeding side according to the type of weft yarn,
The texture of the woven fabric becomes uniform, and it becomes possible to weave a woven fabric of excellent quality.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a weft tension applying device of a fluid jet loom.

FIG. 2 is an enlarged plan view of a weft thread tension applying device.

FIG. 3 is an enlarged side view of a tension applying mechanism.

FIG. 4 is an enlarged front view of the tension applying mechanism before applying tension to the weft thread inserted therein.

FIG. 5 is an enlarged front view of the tension applying mechanism in a state after applying tension to the weft thread that has been wefted.

FIG. 6 is a block diagram of a controller of a rotation amount control system.

FIG. 7 is a block diagram of a torque control type controller.

[Explanation of symbols]

 1 Fluid injection type loom 2 Weft thread tensioning device 3 Holding mechanism 4 Tensioning mechanism 5 Controller 6 Motor 7 Weft thread 8 Weft insertion nozzle 9 Warp thread

Claims (1)

[Claims] 1. In a fluid jet loom, a holding mechanism for holding an end portion of a weft thread, which has been wefted, on the anti-feeding side, and bending the weft thread between the holding mechanism and the warp thread to give tension to the weft thread. And a controller for changing the degree of bending of the weft yarn according to the type of the weft yarn that has been wefted therein.