JPS5927412B2 - Weft inserting device for fluid jet looms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft insertion device for a fluid jet loom, and more particularly to a weft insertion device that can easily reduce the amount of fluid jetted from a weft insertion nozzle.

Generally, in the weft insertion device of a fluid injection type loom, the weft for the next weft insertion is pulled and stored in the weft storage pipe by the airflow in the pipe, as described in Japanese Utility Model Publication No. 45-19108, or It is necessary to wind the weft yarn around a drum and store it, and at the time of weft insertion, pull out the weft yarn by overcoming the traction force or sliding resistance with the drum.

Therefore, in carrying out this operation, there are several problems as listed below due to the fact that the weft yarn must be pulled excessively.

■ The fluid such as water or air that is injected from the weft insertion nozzle must be at high pressure and must be supplied in large quantities.

■ Regarding "■", air-injection type looms in particular consume a large amount of electricity.

■ In particular, water jet methods that use groundwater are subject to restrictions due to recent regulations on pumping up groundwater, so the use of large amounts of water must be avoided.

■Furthermore, if the pressure of the fluid is too high, weft breakage is likely to occur during the injection period.

Recently, there has been a strong demand for a means to solve these problems associated with conventional weft insertion devices.

SUMMARY OF THE INVENTION An object of the present invention is to meet the above-mentioned needs by reducing the pressure and amount of weft inserting fluid used, and to provide an economical weft inserting device with a simple structure.

In order to achieve this object, the weft insertion device of the present invention includes a fluid injection nozzle that encloses the weft yarn and pulls the weft yarn by a jet action, between the weft gripper that clamps the weft yarn and the weft insertion nozzle. The present invention is further characterized in that it includes a diffuser which is provided in a screen-like manner in front of the weft inlet of the weft insertion nozzle and has a hole through which the weft is conducted.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The weft insertion device of the present invention will be described in detail below based on embodiments.

FIG. 1 is a perspective view showing an embodiment of the weft insertion device of the present invention;
FIG. 2 is also a side sectional view of the main part.

In the figure, reference numeral 1 denotes a length measuring drum which rotates in conjunction with the main shaft of the loom.

2 is a length measuring roller around which the weft thread 3 is wound a plurality of times.

A passive roller 4 is provided integrally with the length measuring roller 2 and is in pressure contact with the length measuring drum 1.

Reference numeral 5 denotes a weft storage pipe, the rear end of which is connected to an intake port 8 of a suction device, ie, a blower 7, by a vibro.

Reference numeral 9 denotes a weft gripper, and as shown in FIG. 2, a fixed piece 10 and a movable piece 11 constitute a holding part 12.

The fixed piece 10 is fixed to a machine frame 13, and the movable piece 11 is fixed to a moving rod 14 passing through the fixed piece 10.

The lower end of the movable rod 14 is in contact with a swing rod 16 rotatably connected to a pin 15.

The other end of the swinging rod 16 is brought into contact by a spring 19 with a cam 18 which is fixed to a rotating shaft 17' having a cam follower 17 pivotally mounted and rotating in synchronization with the loom.

The moving rod 14 is urged downward by a spring 20.

21 and 22 are weft guides provided before and after the gripper 90.

23 is a weft insertion nozzle, which is fixed to the machine frame 13.

This example is for a water jet loom, in which high-pressure water is sent from a pump (not shown) to the weft insertion nozzle 23 through a pipe 24 as shown by an arrow 25 during the weft insertion period.

26 is a guide for preventing wear.

Although the above-described configuration is well known, the weft insertion device of the present invention is provided with a fluid injection nozzle, for example, an air injection nozzle 2γ, between the gripper 9 and the weft insertion nozzle 23.

In this air injection nozzle 2γ, a nozzle body 30 is inserted into a holding hole 29 formed in a bracket 28 fixed to a machine frame 13, and the bracket 28 is held by a nut 32 screwed onto the collar 31 and the nozzle body 30. It is fixed by this.

This nozzle body 30 is provided with a fitting hole 33 formed in a part thereof with a paraboloid of revolution, the hole diameter of which decreases as it goes inward from the weft inlet. A needle 34 whose outer shape is approximated is screwed into the fitting hole 33.

A first passage, that is, a weft passage hole 35, which has the same trajectory as the weft introduction passage of the weft insertion nozzle 23 is bored in the center of the needle 34.

A pipe 37 connected to the exhaust port of the compressor 36 is communicated with a second passage, that is, a through hole 38 bored in the bracket 28 and the nozzle body 30.
4, high pressure air is supplied to the gap 39 formed between the two.

Further, an on-off valve 40 is provided at a predetermined position of the pipe 370.

The valve body 41 of the on-off valve 40 is pivotally mounted on a swinging rod 45 having a cam follower 43 at one end abutted by a spring 44 on a cam 42 fixed to the rotating shaft 17'.

This swinging rod 45 is pivotally attached to a pin 46 so as to be freely rotatable.

47 is a wear-resistant weft guide.

Reference numeral 48 denotes a diffuser provided in front of the weft inlet of the weft insertion nozzle 23 to diffuse fluid such as air, which has a hole in the center for conducting the weft and approaches the weft insertion nozzle 23. It is formed to widen at the end, for example, in the shape of a funnel.

This diffuser 48 is fixed to the machine frame 13 with a bracket 49.

50 is a weft guide fixed to the tip of the diffuser 48.

The weft yarn 3 is inserted into the weft storage tube 5, pulled out from the hole on the same end face, inserted into the guide 21, the gripping part 12 of the gripper 9, and then inserted into the guide 22, and then passed through the air injection nozzle 27, the weft guide 50, and the weft insertion nozzle. They are inserted in the order of 23.

Note that 51 is a warp, 52 is a reed, 53 is a heald, and 54 is a woven fabric.

Hereinafter, the operation of the weft insertion device of the present invention will be explained.

The length of the weft yarn 3 is measured by the rotation of the length measuring roller 2, and the weft yarn 3 is stored in the weft storage tube 5 by air current.

When a predetermined amount of the weft yarn 3 is stored, the lower part of the cam 18 and the cam follower 17 come into contact with each other to push up the moving rod 14, and the gripper 9 releases the weft yarn 3, and high-pressure water is supplied to the weft insertion nozzle 23. The weft is inserted.

On the other hand, at the same time as or slightly before the opening of the gripper 9, the cam follower 43 comes into contact with the lower part of the cam 42, and the opening/closing valve 4
0 opens, high-pressure air is also ejected from the air injection nozzle 27, and the weft yarn 3 is pulled by the jet action.

The ejected air hits the diffuser 48 and is diffused.

The pulling force of the weft yarn 3 by the injection nozzle 27 is preferably such that the advancing resistance of the weft yarn 3 becomes zero.

This traction force can be obtained to a predetermined value by moving the needle 34 forward and backward relative to the nozzle body 30, that is, by adjusting the gap 39 between the needle 34 and the nozzle body 30.

When the weft insertion is completed, the cam follower 17 comes into contact with the high part of the cam 18, the swinging rod 16 rotates clockwise, and the movable rod 14 is lowered by the spring 20 to clamp the weft yarn 3.

When the cam follower 43 comes into contact with the high part of the cam 42 a little later than this, the on-off valve 40 closes, and the weft yarn 3 is no longer pulled.

In the above case, as shown in Fig. 1, the blower 7 is not provided with an on-off valve.
A pipe 37 may be connected to the exhaust port.

At this time, air is continuously ejected from the air injection nozzle 27.

In either case, a blower different from the blower for weft storage can be used.

As described above, according to the weft inserting device of the present invention, since the fluid jet nozzle is provided between the weft gripper and the weft inserting nozzle, the progress resistance of the weft is reduced by the fluid jetted from the fluid jet nozzle. Since it is offset by the jet action, the pulling force of the weft thread by the weft insertion nozzle is only needed for weft insertion, and the pressure of the weft insertion fluid that was required in the past to cancel the progress resistance can be increased. This method is extremely economical because it reduces the amount of fluid used without the need for a fluid, and it also has the effect of reducing power consumption.

Furthermore, if the fluid injection nozzle is connected to the exhaust port of the suction blower connected to the weft storage pipe, there is no need to provide any other special suction device, resulting in even more economical effects.

Since a diffuser is provided between the weft insertion nozzle and the fluid injection nozzle, the fluid ejected from the fluid injection nozzle is hardly conducted to the weft passage hole of the needle of the weft insertion nozzle, so weft insertion is difficult. The operation can be performed stably.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the weft inserting device of the present invention;
FIG. 2 is also a side sectional view of the main part. Explanation of symbols, 3...Weft, 5...Weft storage pipe, 7...Blower (air blower), 9...
... Gripper (weft gripper), 23 ... Weft insertion nozzle, 27 ... Air injection nozzle (fluid injection nozzle), 30 ... Nozzle body, 35 ...・・・
・・・Weft thread hole (first passage), 38...Through hole (
second passage), 48... diffuser.

Claims (1)

[Scope of Claims] 1. A weft storage means for storing the measured weft, a weft insertion nozzle for injecting fluid to insert the stored weft, and a combination of the weft insertion nozzle and the weft storage means. There is a weft gripper in between that is opened at the time of weft insertion, and a weft gripper that is located between the weft gripper and the weft insertion nozzle and holds the weft yarn therein, and pulls the weft yarn by a jet action that acts almost at the same time as the weft insertion nozzle. A weft insertion device for a fluid jet loom, which is equipped with a fluid injection nozzle for weft insertion, includes a fixed diffuser provided in a screen shape in front of a weft inlet of the weft insertion nozzle and having a hole through which the weft is conducted. A weft insertion device characterized by: 2. The weft inserting device according to claim 1, wherein the diffuser is formed to diverge toward the weft inserting nozzle as it approaches the weft inserting nozzle.