JPS5930822B2 - Manual weft insertion device for air jet looms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manual weft insertion device for an air injection loom, in which the airflow from a main nozzle is augmented by airflow from a plurality of auxiliary nozzles arranged in series in the weft insertion direction.

In this type of air injection loom, on-off valves that open and close in conjunction with the rotation of the loom are provided in the air path from the air supply source to the main nozzle and a plurality of auxiliary nozzles. A plurality of auxiliary nozzles are configured to eject in a predetermined order.

When weft insertion is performed manually while the loom is stopped, open the manual on-off valve provided in the bypass path that bypasses the on-off valve between the air supply source and the main nozzle and the plurality of auxiliary nozzles. , weft insertion is performed.

However, manual weft insertion takes a long time compared to normal weft insertion that is performed while the loom is in operation, so unlike conventional manual weft insertion devices, air is ejected from all nozzles at once during manual weft insertion, making it very difficult to insert the weft into the weft. When a strong air flow is generated, a weak weft yarn, for example, a single yarn of No. 40 cotton, is occasionally blown off.

The present invention has been made with the aim of solving such problems, and it focuses on the fact that during manual weft insertion, the jetting time is long, so the distance that can be conveyed by each auxiliary nozzle becomes longer. Rather than using all of them, only a portion of them are used.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below based on an illustrated embodiment of the present invention.

In Fig. 1, 1a and 1b are the frames of the loom, 2 is a sled, and sled swords 3 a and t are fixed to both ends of the sled.
3b is pivotally attached to fixed shafts 4a and 4b protruding from the frame 1a and 1b, and swings in the front-rear direction of the loom by a drive mechanism (not shown).

5 is a main nozzle, 6 is a guide having a substantially circular guide hole opposite to the main nozzle 5 and a weft escape gap, and is connected in the weft insertion direction; 7a to 7h are provided between rows of guides 6; These auxiliary nozzles are arranged in series at intervals of , and are fixed to the upper surface of the sleigh 2 in front of a reed (not shown).

On-off valves 9a to 91 as shown in FIG. 2 are fixed to the stay 8 stretched between the frames Ia and Ib, and their outlets are connected to the main nozzle via flexible connecting pipes 10a to 10i. 5 and auxiliary nozzles 1a to 7h, respectively.

The inlet of the on-off valve 9a for the main nozzle 5 is connected to the tank 11a via a connecting pipe 12a.

The inlets of the on-off valves 9b7-9e for the auxiliary nozzles 7a-Id are connected to the tank 11b via connecting pipes 12b-12e.

The inlets of the on-off valves 9f to 910 for the auxiliary nozzles 70 to Th are connected to the tank 11c via connecting pipes 12f to 12i.

These tanks 11a to 11c each have a pressure regulating valve 13a.
~ 13c, and a solenoid valve 14 that is opened during operation of the loom.
via a compressed air supply (e.g. near compressor) 1
It is connected to 5.

The opening/closing valves 9a to 91 are opened and closed by cams 17a to 17i fixed to a rotating shaft 16 that rotates once per rotation of the loom.

That is, when the high portion A of the cam comes into contact with the cam roller 18, the swinging rod 19 pushes up the valve stem 20 to open the valve.

During operation of the loom, when it is time to insert the weft, the high part A of the cam 17a contacts the cam roller 18 of the on-off valve 9a, and the on-off valve 9a opens, blowing out pressurized air from the main nozzle 5 and inserting the weft. The W is carried on this airflow and transported into the guide hole of the guide element 60.

When the tip of the weft yarn W flies close to the auxiliary nozzle 7a, the high part A of the cam 17b comes into contact with the cam roller 18 of the on-off valve 9b, so the on-off valve 9b opens and the ejection starts from the auxiliary nozzle 7a, and the main The weft W is conveyed by adding airflow from the nozzle 5.

This ejection continues until the tip of the weft W reaches near the next auxiliary nozzle 7b.

Then, just before this ejection ends, the high part A of the cam 17c comes into contact with the cam roller 18 of the on-off valve 9c, and the auxiliary nozzle 7b
It starts gushing out.

After this, pressurized air is similarly ejected to the relay set up to the auxiliary nozzle 7h, and the ejection from the main nozzle 5 is stopped at the same time as the auxiliary nozzle 7h, thereby completing the weft insertion.

After that, the cloth is beaten with a reed and woven into cloth.

When the loom stops due to a weft insertion error, etc., the loom stops at the weft insertion phase, but at this time the solenoid valve automatically closes to prevent pressure air from continuously blowing out. Ru.

The manual weft inserting device according to the present invention is provided with a tank 11d that communicates with the pressure air supply source 15 via a pressure regulating valve 13d, and branches off from the tank 11d via a foot-operated on-off valve 21 as a manual on-off valve. Connecting pipe 2 for bypass
2 to the main nozzle 5, and every other selected auxiliary nozzle 7b, 7d, 7f, 7h to the connecting pipe 10c, 10e, 10g y 10.
It is connected in the middle of 1.

Therefore, if the foot-operated on-off valve 21 is opened by stepping on the pedal of the foot-operated on-off valve 21 when the loom is stopped, the connecting pipe le
Since pressurized air is sent to a, 10c, 10e, and 10i, the main nozzle 5 and every other selected auxiliary nozzle 7b, 7
Pressure air is ejected all at once from d, 7f, and 7h, and the weft W is pulled and conveyed by the airflow from the main nozzle 5, which is further assisted by the airflow from the auxiliary nozzles 7b, 7d, 7f, and 7h. Weft insertion is carried out by blowing the weft out.

The reason why a sufficient weft conveying force can be obtained even if only every other auxiliary nozzle is used in this example during manual weft insertion is as follows.

That is, although the auxiliary nozzle normally has a weft conveyance force over a certain distance, the conveyance speed is only high over a short distance.

Therefore, in order to increase the weft insertion speed in relation to the weft insertion time, a large number of auxiliary nozzles are provided.

However, manual weft insertion takes a very long time compared to manual weft insertion while the loom is in operation.

Therefore, there is no time constraint (it is sufficient to fly to the next auxiliary nozzle, so every other auxiliary nozzle is sufficient).

Note that a separate bypass path may be provided for the main nozzle, and a manual opening/closing valve may be separately provided in this path to be linked.

In addition to the above-mentioned foot-operated valve, the manual opening/closing valve may of course be operated by hand.

As explained above, according to the present invention, only a selected number of auxiliary nozzles from the auxiliary nozzle group are used during manual weft insertion, thereby reducing the traction force applied to the weft yarn and eliminating yarn breakage. It is also economical because the amount of air used is reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing one embodiment of the present invention, and FIG. 2 is a view taken along arrows -■ in FIG. 5...Main nozzle 1, 1a-7h...Auxiliary nozzle, 9a-91...Open/close valve, 15...
... Pressure air supply source, 21 ... Foot-operated on-off valve, 22 ... Connection vibe for bypass.

Claims (1)

[Claims] 1. By providing an on-off valve that opens and closes in synchronization with the rotation of the loom between the air supply source, the main nozzle, and a plurality of auxiliary nozzles connected in the weft insertion direction, the airflow emitted from the main nozzle is transferred to the auxiliary nozzle. In an air-injection type loom that is assisted by the airflow ejected from the main nozzle, a bypass path is provided that bypasses the on-off valve of the main nozzle and the on-off valve of some selected auxiliary nozzles. A manual weft insertion device equipped with an operable on-off valve.