JPS60155754A - Wefting aid apparatus of shuttleless 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 (Technical Field) The present invention connects the rearmost end of the weft of one yarn supplying body and the front end of the other yarn supplying body during weft withdrawal, and In a shuttleless loom where the loom continues to operate even when the weft is being drawn from one yarn body to the other yarn feeder, weft insertion assistance that prevents the weft from running out of secondary length when the yarn feeder moves from one yarn body to the other yarn feeder. It is related to the device.

(Prior art) Among shuttleless looms, especially in air-jet looms, after the weft fed from the yarn feeder is guided by a guide, a length measuring device (e.g. drum type, roller nip type, four-line type) is used. and a winding-type length measuring device between the guide body), and as the length is measured, it is stored.
After that, the weft is inserted using an air injection nozzle.

By the way, the length of the weft yarn is measured by the aforementioned length measuring device, which uses the frictional force between the drum or roller and the weft yarn, so if the progress resistance of the weft yarn from the yarn supply body to the length measuring device changes, the length of the weft yarn will change. There is a problem in that the amount of sub-length also changes as the resistance changes.

Therefore, it is desirable that there is no major change in the progress resistance of the weft yarn,
If the last end of the weft of one yarn feeder and the frontmost end of the weft of the other yarn feeder are tied and connected while the weft is being pulled out, the knot is used to insert the weft. In this case, the progress resistance of the weft becomes large due to the knot, resulting in increased slip between the weft and the drum or roller, resulting in a decrease in length measurement.

For this reason, in the conventional apparatus, the length measurement amount at this time is set as the length measurement amount necessary during operation, taking into consideration that the length measurement amount temporarily decreases when the yarn supply body is transferred. However, when doing this, there is a drawback that the slip of the weft yarn is small except when the yarn feeder is transferred, so that the measured length of the weft yarn becomes extra long, and as a result, the weft yarn is wasted.

(Purpose) The present invention has been made to solve the above-mentioned drawbacks of the conventional cloth, and its purpose is to eliminate waste of weft yarns.

(Structure) In order to achieve the above-mentioned object, the present invention has at least two yarn supplying bodies, and among these yarn supplying bodies, one of the yarn supplying bodies is connected to the rearmost end of the weft during weft withdrawal. , in a shuttleless loom that is connected to the front end of the other yarn feeder so that the loom continues to operate even when the weft is being pulled out from one yarn feeder to the other. A detection device that directly or indirectly detects the transition of the weft pull-out portion from one yarn supplying body to the other yarn supplying body is provided, and a weft traction device that is activated by a signal from this detection device is connected to the yarn supplying body. A weft insertion auxiliary device is provided between the length measuring device and the weft to pull the weft toward the length measuring device.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

In the figure, 1 is the frame of the loom, 2 is the pack roller, 3 is the heddle, 5 is the reed, 5 is the pressed beam, 6 warp threads, 7 is the weft thread,
8 is woven fabric, 9 is woven fabric. In addition, 10゛ is a running yarn feeder holder protruding from the side of the frame 1, 11A and IIB are two weft yarn feeders held by this holder 10, and 7a
A knot connecting the rearmost end of the weft yarn 7 of one yarn supplying body 11A and the frontmost end of the weft yarn 7 of the other yarn supplying body 11B, 12
This is a pipe-shaped weft tension applying device fixed to the frame 1 by stays 12a and 12b, and the weft 7 is moved from the length measuring device side to the yarn supplying body side by blowing pressurized air from the open end on the length measuring device side, which will be described later. This applies tension to the weft yarn 7 by pulling it. This is a length measurement storage device for 18 thread wefts 7, which is similar to the device disclosed in, for example, Japanese Unexamined Patent Publication No. 57-16946, and is fixed to the frame 1 via brackets 1ΦA and 14B. 15 is a guide roller provided on the entrance side of the length measuring storage device 18; 16 is a weft guide protruding from the frame 1; and 17 is a weft insertion nozzle provided inside the frame 1.

In this embodiment, as shown in detail in FIGS. 2 and 8, a bracket 18 is provided protruding from the holder 10 between the yarn supplying body 11A and the yarn supplying body 11B.
A weft detection needle 20 is rotatably supported at the end of the weft thread 8 via a pin 19, and this detection needle 20e is supported by the weft thread 7 that connects the yarn supplying body 11A and IIB, and this connection When the weft yarn 7 is exhausted, the detection needle 20 is rotated downward by its own weight, and when the detection needle 20 rotates downward, a proximity switch detects the approach of the detection needle 20 and issues a proximity signal. 21 is fixed to the holder 10 via a stay 22 to constitute a detection device 28.

In addition, the weft pulling device operated by the output signal from the detection device 28 is connected to the yarn supplying bodies 11A and IIB as shown in FIG.
and the length measuring device 18.
Configure using 2.

Figure 4 shows the details. In the figure, 24 is a transparent synthetic resin pipe, and the end of the pipe on the length measuring device 18 side is equipped with an air injection nozzle 25 for the weft tension applying device. .

In the present invention, the yarn supply body 11A of the pipe 24.

An air injection nozzle 26 for the weft pulling device is installed at the end on the 11B side.
be equipped with.

Since these air injection nozzles 25 and 26 have the same configuration, the nozzle 25 will be explained as a representative, and the nozzles 25 and 26 will be explained as a representative.
The distinction is made by adding the symbols A, B, and K.

In other words, this case 27A is a case of a 27A nozzle. This case 27A has a large-diameter hollow cylindrical part and a small-diameter inner-walled cylindrical part. The small-diameter cylindrical part fits into the pipe 24 and is tightened by a band 28. There is. The outer open end of the case 27A is the lid 29
A thread guide tube 30A is integrally formed in the center of the lid 29A and protrudes inward from the case 27. A ring-shaped nozzle port 81A is formed between the hole and the hole.

The large diameter portion of the case 27A is connected to an air supply pipe 88A via a connecting pipe 82A.
8A is connected to a pressure air supply source 86 via a flow rate regulating valve +]4A and a manual pulp 85.

Note that the air supply pipe 88B is connected to a pressurized air supply source 86 via a flow rate regulating valve 84B and a solenoid pulp 87.

FIG. 5 shows the control circuit of the apparatus of the present invention, which includes 21 proximity switches, 89 amplifiers, 40 a memory circuit, and 87a a solenoid for the solenoid pulp 87.

Fig. 6 shows a control circuit using another detection device that indirectly detects the presence or absence of weft yarn.
1A, a light projector 42 receives the reflected light, 48 an amplifier, 44 a comparator, 45 a threshold value setter, 46 a memory, and 37aij solenoid pulp 37 solenoid.

(Operation) Next, the operation of the apparatus of the present invention configured as described above will be explained. When the loom is in operation, the weft yarn 7 is pulled out from the yarn feeder 11A by the length measurement storage device 13. At this time, since the manual pulp 35 in FIG. 4 is opened before the continuous rotation of the loom starts, pressurized air is blown out from the nozzle opening 8]A of the nozzle 25 in the direction opposite to the direction in which the weft yarn 7 moves. Therefore, a predetermined tension is applied to the weft yarn 7 due to the airflow generated within the pipe 24. This is the action of the weft tension applying device 12.

When the weft yarn 7 of the yarn supplying body 11A is consumed and disappears, the weft yarn 7
Since the drawing of IIB moves to the yarn supplying body 11B, the weft yarn 7 connecting the yarn supplying body 11A and IIB disappears, and as a result, the detection needle 20 rotates downward in the direction of arrow O as shown in FIG. Therefore, the proximity switch 21 outputs a pulse signal during that time. The nox signal is amplified by the amplifier 89 shown in FIG.
By energizing and opening the solenoid pulp 87, pressurized air is injected from the nozzle port 81B of the nozzle 26 to pull the weft yarn 7 from the yarn supplying body 11B to the length measuring device 18 side. This is the effect of the weft traction device 12 according to the invention. Therefore, by making this traction force commensurate with the increase in the advancing resistance due to the knot 7a of the weft yarn 7, it is possible to solve the problem of insufficient length measurement during transfer of the yarn supply body. Therefore, according to the present invention, there is no need to set the measurement amount of the weft yarn 7 by the sub-length device 18 to be extra long, and the waste of the segment yarn 7 is reduced, which makes it economical.

In the case of the embodiment shown in FIG. 6, when the weft yarn 7 of the yarn feeder 11A is consumed, the amount of light received by the light receiver 42 that receives the reflected light from the light projector 41 changes, and this change causes the amplifier 4
8, and this amplified output is compared with the output of the threshold setting device 46 by a comparator 44, and a signal is output when the yarn feeder moves. When the memory 46 receives this output signal, it excites the solenoid 87a for a predetermined period of time and opens the solenoid pulse 7787, so that the same effect as in the embodiment described above can be achieved.

As described above, when the single weft pulling device 12 is of the pneumatic type, air is constantly injected from the nozzle port 81B, and the flow rate or pressure of the injected air is increased only when the yarn supplying body is transferred. Also good.

Further, the weft yarn pulling device 12 may be of a roller type, in which case the weft yarn 7 can be sent out slightly faster than its length measurement speed by contact between the roller and the weft yarn when the yarn feeder is transferred. Bye.

(Effects) As mentioned above, the device of the present invention uses the weft pulling device to pull the weft yarn toward the length measuring device when the yarn supplying body is transferred. The increase in resistance can be offset. Therefore, according to the present invention, it is no longer necessary to set the sub-length of the length measuring device to a long value, so that there is no need to waste weft yarns, which is an economically excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a loom equipped with the device of the present invention, Fig. 2 is a perspective view of its detection device, Fig. 3 is a side view thereof, and Fig. 4 is a cross-section of a weft traction device that also serves as a weft tension applying device. 5 is a control circuit diagram thereof, and FIG. 6 is a control circuit diagram showing another embodiment. l... Frame of the loom 6... Warp 7... Weft
7a... Knots - IIA, IIB... Yarn feeder 12... Weft tension adding device and weft pulling device 18...
Length measurement storage device (length measurement device) 28.--Detection device. Patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Claims] 1. It has at least two thread supply bodies 11A and IIB,
Among these yarn supply bodies, one of the yarn supply bodies 1 during weft withdrawal
The loom is operated even when the rearmost end of the weft yarn 7 of 1A is connected to the frontmost end of the other yarn supplier 11B, and the weft 7 is transferred from one yarn supplier 11A to the other yarn supplier 11B. In a shuttleless loom designed to continue, the yarn feeder 11 in use
A detection device 28 that directly or indirectly detects the transfer of the drawn-out portion of the weft yarn 7 from A to the other yarn feeder 11B is provided, and the weft traction device 12, which is activated by a signal from the detection device 28, is connected to the yarn feeding body 11B. A weft insertion auxiliary device for a shuttleless loom, characterized in that it is provided between bodies 11A, IIB and a length measuring device 18 to pull the weft 7 to the length measuring device 18fM.