JP2553526Y2 - Photoelectric weft detector for air jet loom - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric type weft detecting device for an air jet loom, and more particularly, to an air jet loom having a deformed reed having a weft guide groove. The present invention relates to a technique for detecting the success or failure of weft insertion by interrupting an optical path formed by a light emitter and a light receiver as a weft passes.

[0002]

2. Description of the Related Art Conventionally, as a photoelectric type weft detecting device in a loom, there are a reflective type and a transmissive type. The reflection type weft detection device is a device in which a projection and a light receiver are fixed in a sley in a parallel state, and the light projected from the light emitter and reflected on the weft is received by the light receiver to detect the weft. The one disclosed in Kaikai 61-252344 is known. However, in the case of such a reflection type weft detecting device, it is suitable for a yarn that easily reflects light, such as a white yarn, but cannot properly cope with a yarn that easily absorbs light, such as black. There is a problem.

On the other hand, in a transmission type weft detecting device, the light emitting and receiving devices are spaced apart from each other, and the light path formed between the light emitting and receiving devices is interrupted as the weft passes, thereby detecting the weft. For example, there is one disclosed in Japanese Utility Model Laid-Open No. 1-125382. In the case of this type of weft detector,
Unlike the case of the reflection type, the detection is appropriately performed regardless of the yarn type. However, in the case of this prior art, since the weft detecting device is configured to be fixed to the sley, there is a possibility that the optical axis of the light receiving device is shifted due to the vibration caused by the beating motion, causing a detection error. In addition, since the throwing and light receiving devices always face the weft running path, fly waste easily accumulates on the throwing and light receiving surfaces, which may obstruct the detection of the weft and cause a detection error.

In consideration of the above-mentioned problems, the construction of the weft detecting device is of a transmission type and is fixed to the frame of the loom, and the weft is guided between the light receiving device and the light emitting device along with the beating motion. Such a configuration is desirable.

As one of the prior arts having such a configuration,
A weft detecting device disclosed in Japanese Patent Publication No. 57-13653 is known. This prior art is applied to a water jet loom and has a very small distance between the projector and the light receiver. That is, the distance between the light-receiving and light-receiving devices is set to 2 mm or less, and the weft is thrown by the guide surface expanding toward the reed of the main body of the detection device fixed in front of the reed, and guided to the detection space between the light-receiving devices. This is to detect the success or failure of the insertion.

[0006] As another conventional technique, Japanese Patent Publication No.
No. 46189 discloses a weft detecting device.
This prior art is also applied to a water jet loom similarly to the above-mentioned one. However, contrary to the above, the distance between the light projecting device and the light receiving device is considerably increased.

[0007]

However, in the case of the former prior art, a guide surface is required to guide the weft to a narrow detection space between the light emitting and receiving devices. There is a problem that the contact slides and escapes, and the projection is not properly performed and the detection is not performed without being guided between the light receivers. Further, in the case of the latter conventional technique, it is desirable in that the weft does not slide on the detection device, but the distance between the projection and the light receiver is too large, so that the level of the weft detection signal itself becomes low, and the vibration of the loom causes There is a problem that the deviation amount of the optical axis becomes large, which causes a detection error.
In any case, the conventional weft detecting device lacks reliability.

An object of the present invention is to detect the success or failure of weft insertion by a transmission type weft detecting device in an air jet loom, smoothly projecting the weft without contacting and sliding with the main body of the detecting device, and detecting between the light receiving devices. An object of the present invention is to increase the level of a weft detection signal that is guided into a space and that is obtained sufficiently, thereby improving the reliability of a weft insertion detection operation.

[0009]

According to the present invention, an air jet loom having a weft guide groove defined by a deformed reed wing on the front surface of a reed is fixed to a frame of a loom and has a warp. A support member having a pair of support portions vertically spaced apart from each other so as to extend in the direction, and a light emitter and a light receiver accommodated in each of the support portions, the weft of the weft accompanying the beating movement A weft detector for detecting the passage of the weft between the light-receiving device and the light-receiving device during the movement in the cloth fell direction, and a pair of support portions and a light-receiving device for the weft device in the beating process. The gist is that the guide groove is larger than the vertical width of the motion trajectory area and is opposed to the motion trajectory area at an approximate distance.

The approximate distance in the above description is a distance set in consideration of the influence of vibration of the loom and mounting errors.

[0011]

At the end of the weft insertion, the leading end of the weft reaching the non-feeding side moves in the cloth fell direction by a beating movement. At this time, the weft that moves while being regulated by the weft guide groove of the reed does not slide into contact with any of the main bodies of the weft detecting device, and is reliably projected and guided between the light receivers. Moreover, since the throwing and receiving devices are spaced apart from each other at a distance that sandwiches the motion locus region of the weft guiding groove, the weft detecting signal obtained by traversing the optical path formed by the throwing and receiving devices is also obtained. It is a sufficiently high level.

[0012]

1 and 2 show an embodiment of a weft detecting device according to the present invention, in which a U-shaped arm 3 constituting a support member is fixed at one end to a frame 5 of a loom. It is provided so as to extend in the warp direction. An upper limb 31, which is one support portion of the arm 3, has a projector 1
However, the lower support 32, which is the other support,
Are accommodated and arranged to face each other. A weft detector is constituted by the support member, the projection and the light receiver.

Further, notches 33 are formed in the arm 3 everywhere in order to prevent collision with the jetting fluid for weft conveyance. In addition, in order to form a jet stream for removing fly dust and dust on the front surface of the light projector 1 or the light receiver 2, the inner wall of each hole formed in the arm 3 for accommodating the light projector 1 or the light receiver 2 is provided. , And the projector 1 or the receiver 2
An injection port is formed at a position opening to the front surface of the nozzle. Note that a pipe for supplying air to the injection port is desirably formed in the arm 3 so as not to interfere with the warp and the weft.

In the beating process, the reed 4 provided with the weft guide groove 41 on the front surface moves from the last retreat position shown in A in the drawing to the most advanced position shown in C through the position shown in B, where the reed is moved. Make a beating. G in the figure shows the motion locus area of the weft guide groove 41 during this time. Therefore, the throw, the light receivers 1 and 2 and the upper and lower limbs 3
Reference numerals 1 and 32 are larger than the vertical width of the motion trajectory region G and are vertically separated by an approximate distance.

In the illustrated example, the vertical width of the motion trajectory area G is 1
At this time, the distance between the projection and the light receivers 1 and 2 is set to about 18 mm (the distance between the upper and lower limbs 31 and 32 is slightly smaller than this). In the present embodiment, the distance between the light emitting and receiving devices 1 and 2 is set to about 1.7 times the vertical width of the motion trajectory region G, but this is set in consideration of the influence of vibration of the loom and mounting errors. In this case, the distance between the projector and the light receivers 1 and 2 may be smaller than this. That is, it is desirable that the distance between the light emitting and receiving devices is set to be larger than the vertical width of the motion locus area of the weft guide groove, and to be as small as possible so that the upper and lower supporting portions for housing the light emitting and receiving devices do not slide on the weft. .

[0016]

According to the invention, the weft is restrained by the weft guide groove without contacting and sliding on the detecting device, and is reliably projected and guided between the light receivers. In addition, by projecting and positioning the light receiver based on the motion trajectory area of the weft guide groove,
Since the distance between the light emitter and the light receiver is not so large, the level of the obtained weft detection signal is also sufficient. Therefore, stable weft detection without a detection error becomes possible.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing an embodiment of a weft detecting device of the present invention.

FIG. 2 is a perspective view thereof.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light emitter 2 light receiver 3 arm 31 upper limb 32 lower limb 4 reed 5 frame of loom G motion locus area of weft guide groove

Claims (1)

(57) [Scope of request for utility model registration] 1. A weft guide groove defined formed by lamellae variations in air jet loom equipped in front of the reed, weaving machine
To the frame and extend in the warp direction.
Having a pair of support parts spaced apart in the vertical direction
A member, a projector housed in each of the support portions, and
With a light receiver, the weft in the cloth fell direction
Detects the passage of weft between the thrower and receiver during movement
A weft detection device is provided, and a pair of the weft detection devices is provided.
Supporting portion of and projecting light receiver is a large and close than the vertical width of the movement locus zone of the weft guide groove in beating process
A photoelectric weft detecting device for an air jet loom, wherein the photoelectric weft detecting device is disposed opposite to the moving locus region at a distance.