JPS59130347A - Apparatus for buffering tension force of weft yarn in fluid jet type loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft tension relaxation device for a fluid jet loom, which is adapted to alleviate an increase in weft tension during beating.

First, the increase in weft tension during beating in a conventional fluid jet loom will be explained with reference to FIG.

In the figure, 1' is supplied from package 2, length measuring drum 3. Pass through the presser foot roller 4 and press the pool nozzle 5.
．． The weft yarn is linearly inserted into the opening width of the warp yarn 8/ through the weft gripper 6/ and the nozzle 7/, where 'Ll is the length from the nozzle 7/ to the warp yarn. Here, the weft gripper 61
is opened only while the weft thread 1' is flying, and at other times acts to grip the weft thread.

#9/ #10I is a cutter.

Further, 1t indicates the weft that was bent from the nozzle 7/ and driven into the front part of the bag due to beating, and J2 is the length of the weft at that time.

That is, during the beating process, the weft path becomes longer by llm-11 as shown in the figure. In this process, the weft yarn is gripped by the weft gripper 6, and since the warp yarn is closing at a high speed, the weft yarn inserted into the warp yarn is also gripped over substantially the entire width of the fabric. The tension in the weft threads on the path leading to the side weave selvedges increased rapidly, often resulting in weft sinks, single fiber breaks, and thread breaks.

In order to solve this conventional drawback, a bending means is provided in the weft path from the gripper to the nozzle side selvedge, and after weft insertion is completed, the weft is pulled back from the warp iF port and bent, and the weft is not bent during the beating process. Devices are known that reduce the amount of tension in the warp threads to prevent excessive tension.

However, when this device is applied, there are inconveniences such as making mistakes in cutting and not being able to properly remove the ear tissue. This is because the weft bending means in this device uses a pull-back lever, and its interlocking amount is always constant using a cam, etc. On the other hand, the posture of the weft thread inserted during warp shedding is not necessarily uniform each time, and the pull-back lever When bending the weft and pulling it out from the warp opening, there is a difference in the pull-out resistance each time, and the length of the pull-out is not constant. If the weft is pulled out a lot, the interlocking amount of the pull-back lever is constant, so the next time the weft is bent less, the length of the weft is not constant. This is because the tension becomes too weak, resulting in miscuts or improper ear tissue formation, resulting in ear collapse.

Furthermore, in this device, the weft section of the separate lever is always in contact with the weft, so if the weft section becomes abraded, the resistance will increase, and the weft conveyance force is small, such as in air injection looms. There was also the drawback that the 171st weft was not completely inserted in the loom, resulting in so-called short-buck.

The present invention eliminates these conventional drawbacks, and an object of the present invention is to eliminate the above-mentioned drawbacks in alleviating the increase in tension in the weft yarns that occurs during beating.

For this reason, the present invention provides a weft inserting device for a fluid jet loom comprising a weft length measuring section, a weft gripper, and a fluid jet nozzle, in which a tension buffering means is provided between the weft gripper and the fluid jet nozzle to reduce the tension. The tension buffering means is placed on the weft fabric while the tension buffering means is open and does not actually touch the cotton yarn, and after the insertion is completed, it comes into contact with the weft, pulls the weft back and bends it, and then holds the weft in the beating process. A weft thread tension buffering device for a fluid injection type loom, characterized by having means for Rtuffing the degree of bending of the weft thread in accordance with a change in the tension of the weft thread along the path from the container to the nozzle side edge end via the fluid injection nozzle. A tension buffer means is provided which adjusts the degree of curvature of the tension buffer means and has the function of mitigating a sudden increase in weft tension.

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

In FIG. 2, the weft yarn 1 is sent out from a weft length measuring section (not shown), passes through a weft yarn gripper 6, and is cut by a cutter 10 at the selvage section during opening of the warp yarn 8 together with fluid from a fluid jet nozzle.

Here, there are 6 weft grippers, which are conventionally installed on fluid injection looms, and are opened while the weft is flying, and after weft insertion is completed,
It grips the weft yarn l and releases it again immediately after fluid is jetted from the nozzle 7 for the next insertion, and its main function is to determine the timing to start weft insertion.

In the present invention, a tension buffering means A of a set of gate tensors is provided between the weft gripping thread 6 and the fluid injection nozzle 7.

Here, the tension buffering means of the gate tensor set is composed of a gate tensor 20.1141, the gate tensor 20 is fixed, and the gate tensor 21 is rotatably supported by a shaft 19, and is used to bend or open the weft thread 1. It operates in such a way as to This gate tensor 2
1 movement is performed by a spring 11 and a rotating cam 12. That is, the connecting rod 14 has a spring 11 acting on the transition end of the gate tensor 21 to lift the rear end, and a stopper 13 fixed only to the upper surface of the rear end. A cam ball 1'7 that engages with the rotary cam 12 at the button end of the lever tip 16 via the lever 15,16.
In addition, a spring 18 is provided to press the cam ball 17 against the rotating cam 12. Here rotating cam 1
2 rotates at the same rotation speed as the loom main shaft. The operation of the gate tensor 21 by the rotary cam 1B and the spring 11 and the action on the weft yarn I are as follows when the rotary cam 12 has a shape as shown in FIG.

(1) After the assembly is completed, the rotary cam moves from A to B at approximately the same timing as the gripper 6 is closed. According to the structure shown in FIG. 2, the χ end of the gate tensor 21 is lowered, and the weft l is bent while being pulled back from inside the opening.

(2) Next, the rotary cam moves to B-0 with the reed stroke.

Since the cam is at rest angle, the catch 13 is in a resting state. In this process, as mentioned above, the weft path from the nozzle 7 to the nozzle side selvedge-S becomes longer, and the weft tension is about to increase rapidly, but the degree of bending of the gate tensor 20 and 21 is adjusted by balancing with the spring 11. and alleviate the increase in tension.

(8) After beating the reed and cutting the weft at the selvedge part, the rotary cam moves to O-D at the timing when the reed starts to retreat. The cam ball 17 is raised, the connecting slot 14 and the catch 13 are lowered, and the gate tensioner 20.21 is opened.

(4) A fluid jet is generated from the nozzle 7, the weft gripping passage 6 is opened, and the rotating cam moves to D-A while the next weft insertion is performed. Since the cam is at a static angle, the gate tensor is in an open state and weft insertion is completely performed without substantially contacting the weft.

The gate tensors 20, 21, rotating cam 12, and spring 11 are a type of tension buffering means, and the tension buffering means are not limited to those shown in the drawings, and any tension buffering means may be employed as long as it achieves the purpose of the present invention. obtain.

As described above, the present invention does not contact the weft during running, and the
This system uses a tension buffer to alleviate the sudden increase in weft tension during the weft thread wefting process, allowing accurate weft insertion without any resistance while the weft runs smoothly, and in addition, it is always uniform and under the appropriate tension. Since the weft yarn is driven in, there is no single fiber breakage or thread breakage, and it also has the effect of preventing cutting errors and loose ends.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional fluid jet loom, FIG. 2 is a schematic perspective view showing an embodiment of a weft tension buffer device in a fluid jet loom according to the present invention, and FIG. This is an example of a rotating cam used in the device of the present invention. A...Tension loosening of gate tensor set @tf means 1...Weft thread 6...Gripper 7...Fluid injection nozzle 8...Red thread 9...Fake 20, 21...Gate tenser 111...Spring 12...Rotation Cam 13...Latch 14...Connecting slots 15, 16...Shipping bar 17...Cam ball 18...Spring 19...Shaft patent applicant Tei Toyobo Co., Ltd. 1 Figure

Claims (1)

[Claims] In a weft inserting device for a fluid jet loom, which is composed of a weft length measuring section, a weft gripper, and a fluid jet nozzle, a tension buffer means is provided behind the weft gripper and the fluid jet nozzle, and the tension buffer means The inside is open and does not substantially contact the weft, and after finishing, the weft is brought into contact with the weft, and the weft is pulled back and bent. Then, during the beating process, it passes from the weft gripper to the fluid injection nozzle, and then passes through the nozzle side edge end. 1. A weft tension buffering device for a fluid jet loom, comprising means for adjusting the degree of bending of the weft yarn in accordance with a change in tension of the weft yarn on a path leading to the weft.