JP2668560B2 - Weft insertion device for loom - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft inserting device for a loom, and more particularly to, for example, inserting wefts from a plurality of jet nozzles when forming a multicolored woven fabric.

<Prior Art> FIG. 7 shows a conventional example of this type of weft insertion device (see Japanese Patent Application Laid-Open No. 60-252749).

That is, the first and second spray nozzles 2,
3 are juxtaposed. Then, the first injection nozzle 2 and the second
Weft yarns 4 of different colors are alternately inserted into the warp opening portion from the jet nozzle 3 every predetermined rotation. The inserted weft yarn 4 is beaten toward the cloth fell 5 by the reed 1 to form a multicolor woven fabric 6.

Further, the weft yarn 4 in which the weft has been inserted is cut by the cutter device 7 between the first and second injection nozzles 2 and 3 and the cloth fell 5 immediately after the reed beating every time the weft is inserted. .

<Problems to be Solved by the Invention> However, in such a conventional weft inserting device, the weft yarns 4 inserted from the first and second injection nozzles 2 and 3 are provided at substantially the same timing when the main shaft rotation angle of the loom is substantially the same. Since the cutting is performed by the cutter device 7, there are the following problems. That is, since the tension of each weft yarn 4 at the time of cutting is different, the tension of each weft yarn 4 cannot be made appropriate, causing the occurrence of weft yarn breakage and degrading the quality of the woven fabric.

In order to prevent this, if the cut timing is set to the one with the higher weft tension, there is a problem that the weft is less likely to cut with the one with the lower weft tension. On the contrary, if the cut timing is set to the one with the smaller weft tension, the weft will come out of the jet nozzle with the one with the higher latitude. Further, it is conceivable to increase the injection pressure to increase the weft tension, but in this case, there is a problem that weft breakage occurs and air consumption increases.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a weft insertion device capable of setting the tension of a weft inserted from a plurality of injection nozzles substantially in the same manner when cutting.

<Means for Solving the Problems> Therefore, according to the present invention, wefts are inserted into a warp opening portion from a plurality of jet nozzles in a predetermined order, and the wefts that have been wefted are inserted into the jet nozzle and the cloth fell by a cutter device. In which the weft yarns are cut from the tip of each of the jet nozzles to the cutter device so that the respective weft yarns have the optimum tension. The cut timing is set differently for each of the injection nozzles.

<Operation> When the weft lengths at the time of cutting are made substantially the same for the respective ejection nozzles in this manner, the tensions of the wefts at the time of cutting become substantially the same, so the weft tensions can be set optimally and weft breakage, etc. It is possible to cut the weft yarn while preventing the occurrence of the occurrence of the occurrence of the weft, thereby improving the quality of the woven fabric.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

 1 to 5 show a first embodiment of the present invention.

In FIG. 1, first and second injection nozzles 12 and 13 are arranged side by side on the side of the reed 11 so as to move integrally with the reed 11, and from the first and second injection nozzles 12 and 13 to the weft 14 Are alternately inserted into the warp openings. Further, between the first and second injection nozzles 12 and 13 and the cloth fell 15, the weft 14
There is provided a cutter device 16 that cuts off.

The cutter device 16 is provided with a fixed blade 18 attached to the outer wall of the rotary solenoid 17 and a movable blade 19 attached to the output shaft of the rotary solenoid 17. The movable blade 19 is swung by the rotary solenoid 17 so that the weft yarn 14 is cut by the movable blade 19 and the fixed blade 18. The energization of the rotary solenoid 17 is controlled by a controller 20.

A reference timing signal corresponding to a predetermined rotation angle of the main shaft of the loom is input from the rotation angle sensor 21 to the controller 20. A timing presetter 22 for setting the injection timing of the first and second injection nozzles 12 and 13 is provided.
At 20, the delay time from the input of the reference timing to the injection timing is output. Further, a loom control board 23 is provided for instructing the operation of the first and second jet nozzles 12 and 13 at the time of forming the multicolor woven cloth, and the loom control board 23 inputs an instruction signal to the controller 20.

The controller 20 controls the first and second injection nozzles 12 and 13 and the cutter device 16 based on each signal.

 Incidentally, 24 in FIG. 1 is a woven cloth.

Next, the operation will be described with reference to FIG. 4 and FIG.
In this embodiment, the first and second injection nozzles 12, 1
The case where wefts 14 are alternately inserted from 3 will be described.

First, a predetermined injection timing A from the first injection nozzle 12
Weft 14 is wefted into the warp opening with
Is beaten by the reed 11 toward the cloth fell 15. Then, as shown in FIG. 1, one end portion of the beating yarn 14 that has been beaten is cut by the cutter device 16 at a predetermined cut timing A '(main shaft rotation angle is, for example, 5 °) immediately after the beating.

Immediately after the cutting, the weft yarn 14 is weft-inserted into the warp opening portion from the second jet nozzle 13 at a predetermined jet timing B, and the weft-inserted weft yarn 14 is beaten by the reed 11 toward the cloth fell 15. Then, as shown in FIG.
Is a predetermined cut timing B 'immediately after the end of the beating.
(At a spindle rotation angle of, for example, 30 °) and cut by the cutter device 16.

At this time, the weft 14 inserted from the first injection nozzle 12
From the tip of the first jet nozzle 12 to the cutter device 16 at the time of cutting, and from the tip of the second jet nozzle 13 to the cutter device 16 at the time of cutting the weft 14 inserted from the second jet nozzle 13. The weft length is almost the same.

As described above, the first and second injection nozzles 12, 13
The cutter device 16 is attached to each of the jet nozzles 12 and 13 so that the weft lengths from the tip to the cutter device are approximately the same when cutting.
The cutting timing of each injection nozzle was changed
The tensions of the weft yarns 14 at the time of cutting at 2 and 13 can be made substantially the same. Therefore, the tension of the weft yarn 14 in each of the jet nozzles 12 and 13 can be set appropriately, so that each weft yarn can be cut smoothly while preventing the occurrence of weft yarn breakage and the like, so that the quality of the woven fabric can be improved.

FIG. 6 shows a second embodiment of the present invention. In this embodiment, the cutter device 25 is driven by air pressure.
The other parts are the same as in the first embodiment, and the description is omitted.

That is, the movable blade 27 is swingably attached to the fixed blade 26 of the cutter device 25, and the movable blade 27 is caused to swing by the air cylinder 28. The air cylinder 28 is connected to an air supply source 29 via a solenoid valve 30, and the solenoid valve 30 is operated by a controller to supply air to the air cylinder 28.

In such a configuration, the same effect as in the first embodiment is achieved.

The present invention can be applied to a loom having two or more nozzles.

<Effects of the Invention> As described above, the present invention adjusts the cutting timing of the cutter device so that each weft yarn has an optimum tension at the time of cutting from the tip of each injection nozzle to the cutter device. Since the nozzles are set differently, the weft tension at the time of cutting in each injection nozzle can be set substantially in the same manner. For this reason, since the weft tension at the time of cutting in each jet nozzle can be properly set, each weft can be cut smoothly while preventing the occurrence of weft breakage, and thus the quality of the woven fabric can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention, FIG. 2 is an enlarged view of an essential part of the same, FIG. 3 is a control circuit diagram of the cutter device of the same, and FIG. Plan view for fifth
FIG. 6 is a time chart, FIG. 6 is a configuration diagram showing a second embodiment of the present invention, and FIG. 7 is a plan view showing a conventional example of a weft insertion device. 12 ... first injection nozzle, 13 ... second injection nozzle, 14 ...
Weft yarn, 15 ... Woven cloth, 16 ... Cutter device

Claims (1)

(57) [Claims] 1. A weft yarn 14 is inserted into a warp opening portion from a plurality of jet nozzles 12 and 13 in a predetermined order, and the weft yarn 14 put into the weft yarn is fed to a jet device 12 by a cutter device 16. In the weft inserting device of the loom, which is designed to cut between the cutting nozzles 16 and 16 from the tip of each of the injection nozzles 12, 13.
The cutting timing corresponding to the main shaft rotation angle of the cutter device 16 is set to be different for each of the injection nozzles 12 and 13 so that each weft 14 has an optimum tension during cutting. Characteristic weft insertion device for looms.