JPH0262620B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a device for detecting a weft thread being flown by a jet of fluid in a weft guide path formed on the front surface of a reed.

(Prior Art) Generally, in a jet room in which the weft is inserted into the warp shedding using a jet of fluid, the insertion state of the weft has a great influence on the quality of the fabric. Therefore,
Conventionally, as shown in FIG. 4, in order to detect whether the tip of the weft yarn Y ejected from the main nozzle 1 for weft insertion has reached a predetermined area, a discarded edge W1 is used.
A weft detector 2 is installed on the outside of the selvedge or between the selvedge W1 and the woven fabric W. Such a conventional device is disclosed, for example, in Japanese Patent Laid-Open No. 57-5947.
In this conventional device, as shown in FIG.
A weft detector 2 with a rod-shaped lens 5 disposed on the front side of the slay 6 is attached to the front side of the slay 6, and the light projected from the light projecting element 3 is focused by the rod-shaped lens 5, then hits the weft Y and is reflected. However, this reflected light is collected by the rod-shaped lens 5 and then received by the light-receiving element 4, whereby the weft yarn Y is detected. That is, the purpose of this conventional device is to improve the weft detection accuracy.

(Problems to be Solved by the Invention) However, when the weft detector 2 designed to improve the weft detection accuracy is provided outside the woven fabric W or the waste selvedge W1 as shown in FIG. In order to perform accurate weft detection, it is necessary to insert extra weft threads, leading to wastage of weft threads. Such wastage of weft threads is not compatible with the current situation where we are trying to eliminate wasted weft threads as much as possible. Moreover, weft Y
Even in the case of a so-called end error, which does not need to be treated as an abnormality, in which the weft fabric is formed normally even though the tip of the weft thread does not reach the installation position of the weft detector 2, it is treated as a weft insertion error and the operation of the loom is stopped. It will be stopped. Such unnecessary operation stoppages not only cause a decrease in the operating efficiency of the loom, but also increase the proportion of weaving steps in the woven fabric when the loom is stopped and started, which adversely affects the quality of the woven fabric.

Further, even when the weft detector 2 is provided outside the woven fabric W, there is a problem in that the weft cannot be detected at an early stage. In other words, the timing of detecting a weft insertion error must match the arrival timing of the weft tip. For example, even if the weft tip reaches only halfway through the woven fabric, the detection of a weft insertion error will occur when the weft tip reaches the weft tip. This must be done at the time when the weft detector is expected to reach the installation position, which delays detection of weft insertion errors and makes it difficult to control the machine afterwards.

In order to detect weft insertion errors early, it is sufficient to install a weft thread detector within the weaving width area of the woven fabric.
Such a measure is not possible with the conventional device because it is not possible to separate the warp threads and enter the warp shedding.

In Japanese Patent Publication No. 54-24501, a light projecting section is installed on the top of the reed in the area above the warp threads, and a light receiving part is installed in the area below the warp threads, so that the projected light is received by the light receiving element in the area below the warp threads. A weft yarn detection device is disclosed, and this conventional device is capable of detecting weft yarns within the weaving width of a woven fabric. However, the method of detecting a single weft using light that passes through a group of closely arranged warp threads has a drawback in that the detection accuracy is unreliable and reliable weft detection cannot be expected.

Structure of the Invention (Means for Solving Problems) Therefore, the present invention includes a reflective light projecting/receiving device for detecting the weft yarn that is flown by the jetting fluid in the weft guide path formed on the front surface of the reed. In a weft detection device for a jet room, a pair of support pieces that can separate the warp threads and enter the warp shedding are arranged side by side in the weaving width area, spaced apart in the direction of the weft guide path, and a The gist is that a light projecting section is provided, a light receiving section is provided at the tip of the other support piece, and the optical axes of these light projecting and receiving sections are directed into the weft guide path.

(Function) That is, when the reed retreats after beating the reed, the pair of support pieces provided with the light emitting/receiving portions separate the warp group forming the opening and enter into the opening, forming the opening on the front surface of the reed. When the tip of the weft thread that has been guided flying through the weft guide path reaches the installation position of both support pieces, the weft thread is detected, and a weft insertion error occurs in which the weft tip does not reach the installation position of both support pieces. The operation of the loom is stopped based on the weft insertion error detection signal from the light emitting/receiving section. Therefore, such machine control can easily detect weft insertion errors at an early stage. At this time, a portion of the warp threads separated by both support pieces enters between the support pieces, thereby preventing the generation of streaks in the warp direction of the woven fabric. Further, since the weft can be detected within the warp opening, the wastage of the weft, which was a problem in the conventional detection method of detecting the weft outside the warp, is eliminated.

(Example) Hereinafter, examples 1 to 3 that embody the present invention will be described.
This will be explained based on the diagram.

A reed 12 is provided on the sleigh 11 and has a function of guiding the weft Y ejected from a main weft insertion nozzle (not shown). That is, concave guide holes 13a are formed in the front surface of a large number of reed blades 13 constituting the reed 12.
is formed, and the weft Y is formed by the row of holes 13a.
A guide passage S is formed.

A mounting groove 11a is formed in the front surface of the sleigh 11 in its longitudinal direction, and a plurality of support blocks 14 (only one is shown in the drawing) correspond to the reed 12, and bolts 15 and 15 are inserted into the mounting groove 11a. It is tightened and fixed by a nut 16 so that its sliding position can be adjusted along the mounting groove 11a. An auxiliary nozzle 17 is inserted and fixed into each block 14 in the vertical direction, and an injection hole 1 at the tip of the nozzle 17 is fixed.
7a is arranged near the weft guide path S, and the auxiliary jetting fluid from the injection hole 17a assists the flight of the weft Y inserted into the weft guide path S.

A weft detector 18 is installed on the front surface of the slay 11 at a position corresponding to the inside of the warp T group forming the woven fabric W (in this embodiment, near the edge of the woven fabric W on the opposite side of weft insertion).
is attached to the mounting groove 11 by the bolt 24 and nut 25.
It is tightened and fixed so that the sliding position can be adjusted along the direction a. The weft detector 18 includes a support plate 19 and a pair of support pieces 20 and 21 that are attached and fixed in parallel to a mounting portion 19a protruding from one side of the support piece 19 at a distance in the direction of the weft guide path S. , one support piece 2
0, and a light receiving element 21 embedded in the tip of the other support piece 21.
and a substrate 22 having a circuit for amplifying the signal from the light receiving element 21a.
A lead wire 23 connected to a light emitting output circuit and a control circuit (not shown) is connected to a terminal portion 22a formed integrally with the terminal portion 22a.

The tips of both support pieces 20 and 21 are arranged near the bottom of the weft guide path S, and the light emitting element 20a and the light receiving element 21 are arranged as shown by arrows in FIG.
The optical axis of a is set to point within the weft guide path S.

Now, at the time of weft insertion, as shown in Figures 1 and 2, the tips of the support pieces 20 and 21 separate the warp threads and enter the warp opening, and light is constantly projected from the light projecting element 20a. There is. When normal weft insertion is performed in which the tip of the weft yarn Y reaches the outer end position of the discarded selvage W1, the projected light is reflected by the same weft yarn Y, and this reflected light is received by the light receiving element 21a, A conversion signal is sent to the control circuit side.
Therefore, it is determined that the weft insertion is normal, and the weaving operation continues. If the tip of the weft yarn Y does not reach the installation position of the weft yarn detector 18 for some reason, the projected light will not be reflected by the weft yarn Y, and no conversion signal will be output from the light receiving element 21a to the control circuit. Therefore, it is determined that a weft insertion error has occurred, and the operation of the loom is stopped.

Normally, in high-speed looms such as jet looms, in order to prevent damage to various parts, the loom is rotated by inertia to a certain extent and then stopped. Therefore, there is a risk that not only the erroneous yarn inserted during the inertial rotation of the machine frame but also the weft yarn following the erroneous weft yarn may be woven into the woven fabric. In order to remove a mis-woven thread from a woven fabric, it is also necessary to remove the weft thread that has been woven into the fabric following the mis-woven thread, and this removal work is very complicated and requires a lot of time from the loom's operation. This causes a decrease in efficiency.
Therefore, as in this embodiment, the earlier a weft insertion error is detected within the weaving width region of the woven fabric, the earlier the machine can be stopped, and the stopping operation becomes easier.
Further, since the weft yarn detection is performed within the weaving width region of the woven fabric, the weft yarn detection can be performed without inserting extra weft yarns, and it is possible to avoid wasting the weft yarns. Moreover, the tip of the weft Y is the discarded edge W1 of the woven fabric W.
Even if a so-called end mistake occurs, which does not need to be considered as an abnormality, in which the fabric is formed normally even though the fabric does not reach the specified position, or if normal tissue is not partially formed at the edge of the fabric, this is not considered a particular problem in terms of quality. Even in the event of an end mistake in the woven fabric, the same weft yarn Y is detected by the weft detector 18 disposed inside the group of warp yarns T forming the woven fabric W, and the operation of the loom is continued. Therefore, it is possible to avoid a decrease in operating efficiency, suppress the ratio of weaving steps of the woven fabric when the loom is stopped and started, and prevent a decrease in the quality of the woven fabric.

In addition, when attaching the light emitting part and the light receiving part to the tip of one support piece in a vertically overlapping manner, the tip of the support piece does not come into contact with the front of the woven fabric during reed beating, and the light does not reach the reed. It is difficult to place the light projector and the light receiver in close proximity to the weft guide path S so that they can hit the weft Y without being obstructed. However, in the present invention, the light emitting/receiving section is separately provided at the tips of the pair of support pieces 20 and 21 arranged apart in the direction of the weft guide path S, so that the weft guide path guides the weft Y in flight. The light projecting section 20a and the light receiving section 21
a can be made as close as possible to the same degree, and the weft detection accuracy is improved. In addition, a portion of the warp threads T that are separated by the pair of support pieces 20 and 21 enters the gap between the two support pieces 20 and 21, so that the degree of separation of the warp threads T is made uniform. Therefore, the woven fabric W does not have streaks in the warp direction, and the woven fabric W
quality deterioration is prevented.

Furthermore, in this embodiment, the mounting position of the weft detector 18 can be adjusted along the mounting groove 11a of the slay 11, so the weft detector 18 can be easily changed to an appropriate position in response to a change in weaving width.

Of course, the present invention is not limited to the above-mentioned embodiments. For example, by arranging a plurality of weft detectors as described above within the weaving width area, a weft detection error by one weft detector can be detected by another weft detector. It is possible to create a system for detecting weft insertion errors between weft thread detectors by correcting errors using a device, or by extracting weft detection signals from these multiple weft thread detectors to, for example, an oscilloscope, it is possible to measure the weft thread speed or detect the weft thread tip. The timing of reaching a predetermined position can be known, and the injection timing of the auxiliary nozzle 17 can be appropriately set according to the change in weaving width, yarn type, yarn count, etc. Moreover, by moving the weft detector closer to the main nozzle for weft insertion, weft insertion errors can be detected even earlier.

Of course, the weft yarn detector of the present invention can also be used outside the weaving width area as in the conventional case.

Effects of the Invention As detailed above, in the weft detection device of the present invention, the light emitting/receiving section is made to be able to enter the warp shedding within the weaving width area, so weft insertion errors can be detected early and subsequent The machine can be easily controlled, and when a weft insertion error (end error) occurs that does not affect the quality of the woven fabric, weaving can continue without stopping the machine, improving operational efficiency. At the same time, the quality of the woven fabric can be improved by suppressing the occurrence of weaving steps that are likely to occur when the machine is stopped, and furthermore, it is possible to avoid waste of weft yarns, which is an excellent effect.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment embodying the present invention. Figure 1 is a perspective view of the main part, Figure 2 is a longitudinal sectional view as seen from the weft insertion direction, and Figure 3 is a plan sectional view of the main part. , FIG. 4 is a schematic plan view showing an installation method of a conventional weft yarn detector, and FIG. 5 is a perspective view showing a conventional weft yarn detector. Reed...12, Weft detector...18, Support piece...20,
21, Light projecting element as a light projecting section...20a, Light receiving element...21a as a light receiving section, Weft guide path...S,
Warp...T, weft...Y.

Claims (1)

[Claims] 1. In the jet room's weft detection device, which is equipped with a reflective light emitting/receiving device to detect the weft threads flying by the jet fluid in the weft guide path formed on the front surface of the reed, the warp threads are separated and entered into the warp opening. A pair of supporting pieces that can be used are arranged side by side in the weaving width area and spaced apart in the direction of the weft guide path, and a light emitting part is provided at the tip of one of the supporting pieces, and a light receiving part is provided at the tip of the other supporting piece. A weft detection device in a jet room, wherein the optical axis of the light emitting/receiving section is directed into the weft guide path.