JPH0226960A - Method for picking of air jet type loom - Google Patents

Abstract

PURPOSE:To prevent slackness of a weft yarn in a part near a main nozzle and improve quality of a woven fabric by continuing air jetting from any auxiliary nozzle near the main nozzle till completion of the air jetting from the main nozzle. CONSTITUTION:A weft yarn is jetted by jetting from a main nozzle, successively conveyed with jetted air streams from plural auxiliary nozzles arranged side by side at a prescribed interval in the picking direction and picked. In the process, air jetting from any auxiliary nozzle near the above-mentioned main nozzle is continued till completion of air jetting from the afore-mentioned main nozzle. Thereby, pulling of the weft yarn is surely continued till completion of jetting from the above-mentioned main nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a weft insertion method for an air injection loom equipped with a plurality of auxiliary nozzles arranged at predetermined intervals in the weft insertion direction.

BACKGROUND OF THE INVENTION This type of technology is known as a so-called relay injection type, as disclosed in Japanese Patent Publication No. 48-31949, for example. This involves arranging a plurality of auxiliary nozzles at predetermined intervals in the weft insertion direction, and injecting air in order from the auxiliary nozzles closest to the main nozzle to chase the tip of the weft as the weft yarn flies. Air injection is stopped sequentially from the auxiliary nozzle after the weft tip has passed through. According to this method, a supporting airflow is generated throughout the weft insertion path from the start of weft insertion, making it possible to perform stable weft insertion.

Also, JP-A-50-91038 and JP-A-60
As shown in Japanese Patent No. 9946, a plurality of auxiliary nozzles arranged at predetermined intervals in the weft insertion direction are connected to the weft insertion side (
The auxiliary nozzles are grouped one by one starting from the side closest to the main nozzle, and at the start of weft insertion, all the auxiliary nozzle groups start jetting air at once, and the jetting is stopped sequentially from the auxiliary nozzle group after the tip of the weft has passed. Some have done so.

Problems to be Solved by the Invention However, according to the conventional method as described above, even before weft insertion is complete, air injection is stopped in order from the auxiliary nozzle or group of auxiliary nozzles through which the tip of the weft thread has passed. As a result, a portion of the weft yarn, particularly close to the main nozzle, deviates from the weft insertion path and becomes sagging, which is a factor that deteriorates the quality of the woven fabric.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a weft insertion method that improves the quality of woven fabric by preventing slack in the weft near the main nozzle.

Means for Solving the Problems In the weft insertion method of the present invention, as described above, a plurality of auxiliary nozzles are arranged at predetermined intervals in the weft insertion direction, and each auxiliary nozzle is In the weft insertion method for an air injection loom, in which weft insertion is performed by controlling the air injection timing and time of the nozzle and blowing the tip of the weft one after another, the plurality of auxiliary nozzles include:
Air injection from one of the auxiliary nozzles close to the main nozzle is continued at least until the end of air injection from the main nozzle.

The auxiliary nozzles referred to herein include a group of auxiliary nozzles in which several nozzles are grouped as one group, as described above.

Further, the auxiliary nozzle that continues air injection until the end of air injection by the main nozzle may be a single auxiliary nozzle close to the main nozzle or a plurality of auxiliary nozzles.

Effect According to this method, at least until the air injection from the main nozzle ends, air injection continues from one of the auxiliary nozzles close to the main nozzle, so the air injection from the auxiliary nozzle exerts a traction force on the weft yarn. As a result, it is possible to prevent the weft from sagging in the area near the main nozzle.

Embodiment FIGS. 1 and 2 are explanatory views of the configuration of a loom for carrying out the present invention, in which 1 is a frame, 2 is a reed holder, and 3 is a reed, the front of which has a recess 4 for liquid. A weft guide groove G extending in the weft insertion direction is formed by the rows. 5 is a weft, and 6 is a main nozzle fixed to the reed holder 2. Further, 7 is a warp, 8 is a woven fabric, and 9 is a temple.

A block-shaped nozzle holder 10 is fixed to the reed holder 2 together with the lower frame of the reed 3, and this nozzle holder IO has a plurality of (five in this embodiment) auxiliary nozzles 11- at predetermined intervals in the weft insertion direction. 15 is attached.

The auxiliary nozzle 11-15 is pipe-shaped and has a closed tip and has an air injection port (not shown) on the side wall, and the air injection port is oriented toward the weft guide groove G in the diagonal weft insertion direction. Further, the base ends of the auxiliary nozzles 11 to 15 are connected to the reed holder 2.
It protrudes from the lower surface of the pipe, and one end of each of flexible pipes 16 to 20 is connected to the protruding end portion of the pipe.

A support member 21 is provided below the woven fabric 8 and is stretched between the frames 1.1, and five on-off valves 22 to 26 are attached to the support member 21. The other ends of the pipes 16 to 20 are connected to the discharge ports of the on-off valves 22 to 26, while the inlets of the on-off valves 22 to 26 are connected to the pipe 2.
7 to 31 to an air tank 32, and the air tank 32 is further connected to a predetermined pressure air supply source 33. The main nozzle 6 also connects to the pressure air supply source 3 via a pipe 34, 35, an on-off valve 36, and an air tank 37.
Connected to 3.

The on-off valves 22 to 26 are connected to the on-off lever 3 as shown in FIG.
A cam follower 39 is attached to the opening/closing lever 38. The air passage is opened and closed by the stroke of a valve rod (not shown) following the opening/closing lever 38. A plurality of cams 41 to 45 corresponding to the cam followers 39 are fixed to a rotating shaft 40 that rotates in synchronization with the main shaft of the loom.

That is, the profile shape of each cam 41-45 is set according to the injection timing and injection time of each auxiliary nozzle 11-15. 46 is a cam for the main nozzle 6.

In this embodiment, as shown in FIG. 3, pressurized air is injected from the main nozzle 6 after a predetermined time after beating (the rotation angle of the loom main shaft is 0'), and a weft gripper (not shown) is When the weft yarn 5 that has been held until then is released, the weft yarn 5 is pulled by the air jetted by the main nozzle 6 and weft insertion is started. At approximately the same time, the on-off valve 22 opens and pressurized air is injected from the auxiliary nozzle 11. Therefore, the weft yarn 5 flies while its tip is pulled by the traction force caused by the air jet from the main nozzle 6, as well as by the air jet from the auxiliary nozzle 11.

During this flying process of the weft yarn 5, when the tip of the weft yarn 5 reaches the vicinity of the auxiliary nozzle 12, the on-off valve 23 opens, and pressurized air is also injected from the auxiliary nozzle 12. This is the same for the subsequent auxiliary nozzles 13 to 15, and the corresponding on-off valves 24 to 26 open at a predetermined timing so as to substantially follow the tip of the flying weft 5, and each auxiliary nozzle 13 Pressure air is injected from ~15.

As is clear from FIG. 3, the injection periods of the adjacent auxiliary nozzles are in the same line with each other, and when the tip of the weft 5 finishes passing through the auxiliary nozzles 12 to 15, the main nozzle 6 The injection of pressurized air is cut off in order of distance.

On the other hand, the auxiliary nozzle 1 closest to the main nozzle 6
1, the air injection from the main nozzle 6 is continued until the air injection from the main nozzle 6 is finished, and a traction force is applied to the part of the flying weft yarn 5 that is close to the main nozzle 6. As a result, the weft 5 is prevented from coming off the weft guide groove G and sagging in a portion near the main nozzle 6.

FIG. 4 and FIG. 5 are diagrams showing other embodiments of the present invention,
In this embodiment, each of the auxiliary nozzles 51 to 53 has a so-called twin type structure with two nozzle heads 50a and 50b, and the direction m1 of the jet airflow of one nozzle head 50a is set at an angle αl with respect to the weft insertion direction. , the directional direction m2 of the jet airflow of the other nozzle head 50b is set at an angle α2 (αl × α2). As a result, the jet airflows from both nozzle heads 50a and 50b interfere with each other, so that the direction of the jet airflow that finally acts on the weft yarn 5 becomes the directivity direction M, which is a combination of ml and m2.

Here, the air jetted from the auxiliary nozzle as described above applies a traction force to the weft 5 in the weft insertion direction, and at the same time moves the weft 5 into the weft guide groove G so that the weft 5 does not come off the weft guide groove G.
However, it is important to set the direction of the ejected air so that these two functions can be achieved at the same time, and the direction also depends on the properties of the weft yarn 5. It's going to change.

Therefore, according to the embodiment shown in FIGS. 4 and 5, by controlling the injection pressure of either one of the nozzle heads 50a or 50b, the direction M of the injection air that finally acts on the weft 5 is As a result, the optimal orientation direction can be easily adjusted according to the properties of the weft yarns 5, etc. In this embodiment, the auxiliary nozzle 5
1 continues until the main nozzle 6 finishes the injection.

In the embodiment shown in FIG. 6, the auxiliary nozzles 61, 62, and 63 arranged in parallel in the weft insertion direction are offset so as to be retracted every other time, and the direction m3 of the jet air of the auxiliary nozzle 62 is set relative to the weft insertion direction. The angle α3 is set, and the directional direction m4 of the jet air of the offset auxiliary nozzle 61°63 is set at the angle α4 (α3 x α4).

As a result, the air jetted by the auxiliary nozzle 62 is mainly directed to the weft 5.
The jet air from the offset auxiliary nozzles 61 and 63 mainly serves to push the weft 5 deep into the weft guide groove G. Moreover, the length rl of the jetted air of the offset auxiliary nozzles 61 and 63 actually touching the weft yarn 5 is considerably longer than Q2 in the case of no offset, and the weft yarn 5 is moved deep into the weft guide groove G as described above. The effect of pushing into the area is further improved. In this embodiment, the auxiliary nozzle 6
1 continues until the main nozzle 6 finishes the injection.

The embodiment shown in FIG. 7 has two main nozzles 6.6 arranged in parallel.
For example, in a loom in which weft threads 5.55 of different colors are inserted alternately from 6 to 6, by offsetting the weft insertion nozzle 71 closest to the main nozzle 6.66 among the auxiliary nozzles 71 to 73, the embodiment shown in FIG. Similarly, a large length is ensured for the air jetted from the auxiliary nozzle 71 to actually come into contact with the wefts 5, 55. According to this embodiment, the weft yarn 55 inserted from the main nozzle 66 at a position particularly away from the weft insertion path is also affected by the air jetted from the auxiliary nozzle 71, which continues jetting the weft until the end of the air jetting from the main nozzle 66. The weft yarn can be pushed into the weft guide groove G reliably.

Effects of the Invention As described above, according to the present invention, air injection from one of the auxiliary nozzles close to the main nozzle is continued at least until the end of air injection from the main nozzle. The air injection ensures that the weft traction force is applied until the end of the air injection from the main nozzle, and it is possible to prevent the weft from sagging near the main nozzle, thereby improving the quality of the woven fabric.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the main part configuration of a loom showing one embodiment of the present invention, Fig. 2 is the same (front explanatory diagram of the entire loom, Fig. 3 is a timing chart of the injection of the auxiliary nozzle, and Fig. 4 is the main part of the loom). FIG. 5 is an explanatory plan view of FIG. 4, and FIGS. 6 and 7 are explanatory plan views showing still other embodiments of the invention. 5.55...Weft, 6.66...Main nozzle, 1
1-15...Auxiliary nozzle, 22-26...Opening/closing valve,
51.52.53... Auxiliary nozzle, 61.62.63
...Auxiliary nozzle, 71.72.73...Auxiliary nozzle, G...Weft guide groove. Figure 1 G...-m series plan circular groove

Claims (1)

[Claims] (1) A plurality of auxiliary nozzles are arranged at predetermined intervals in the weft insertion direction, and the air injection timing and time of each auxiliary nozzle are controlled in accordance with the flight of the weft from the main nozzle, so that the tip of the weft is successively removed. In the weft insertion method for an air-injection loom, the weft insertion is performed by blowing the air out of the main nozzle. A weft insertion method for an air injection loom, characterized in that weft insertion continues until the end of injection.