JPH06200452A - Weft yarn detector - Google Patents

Abstract

PURPOSE:To provide a detector capable of detecting a weft yarn more accurately by preventing a malfunction or a trouble, in relation to a weft yarn detector for detecting the presence of a weft yarn by allowing the end part of the weft yarn to pass so as to momentarily intercept the light pass of a sensor in beating. CONSTITUTION:In a weft yarn detector equipped with a detection unit 2 in which the edge surface 21a of a projector faces the edge surface 22a of a receptor, the edge surface 21a of the projector and the edge surface 22a of the receptor are each formed at the top part of an optical fiber 21 or 22 or on the extension thereof. A yarn guide moving together with a reed may be set so as to form a space where jet water is allowed to pass forward from the reed and between the reed and the side of a sensor holder 8 involving that detection unit 2. In case this yarn guide is set, the detection unit 2 can be set at a position behind of the cloth are retreated in the opposite direction to the reed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft detecting device in a loom, particularly in a water jet loom, which temporarily cuts off the optical path formed between the light emitter and the light receiver at the tip of the weft during beating. The present invention relates to a device for detecting the presence or absence of wefts by passing the wefts through.

[0002]

2. Description of the Related Art As a weft detecting device for a water jet loom, a pair of electrodes provided on the front face of a lure contact the tip of a weft yarn wetted with water when the beating is made to conduct the pair of electrodes. A detection device utilizing this, or a structure for detecting a weft by changing a swinging motion of the contact needle by contacting the weft with a swingably provided contact needle has been used. There is a drawback that the loom becomes high-speed and malfunction is likely to occur when the weft yarn is fine denier.

Therefore, the inventor of the present invention is the Japanese Patent Publication No.
Japanese Patent No. 13653 discloses a weft detecting device, that is, a locus surface on which a weft yarn moves when a detection portion formed between an end surface of a light emitting portion and an end surface of a light receiving portion is beaten outside the selvage on the non-nozzle side of a woven cloth. The position of the weft is detected by using a photoelectric sensor to electrically detect that the tip of the weft cuts off the optical path formed between the end surface of the light emitter and the end surface of the light receiver at the time of beating. We proposed a photoelectric weft detection device that detects the presence or absence of In this device, the gap between the light emitting part end face and the light receiving part end face is set to 2 mm or less so that a water layer can be held in this gap, and the water layer held when the weft passes through the detection part is destroyed. By utilizing this, a large detection signal can be obtained even when the weft yarn is fine denier.

[0004]

In the above conventional apparatus, LE is used.
A light-emitter such as D and a light-receiver such as a phototransistor are arranged on both sides of the detector to form a light-emitter end face and a light-receiver end face. Further, in order to prevent the detection signal from being output from the photodetector even when the water layer held between the end face of the light emitting unit and the end face of the light receiving unit is disturbed by the water jetted from the nozzle and the weft is not present, A shield plate is provided on the nozzle side of the gap between the end surface of the light portion and the end surface of the light receiving portion to prevent the jet water from flowing into this gap.

The detection portion of the weft detection device must be arranged at a position where the weft passes at the time of beating, and the faster the loom, the earlier the beating, that is, the closer the weft is to the weft insertion position. It is difficult to avoid exposing the detector to the jetted water because of the demand for detection. Therefore, in the conventional photoelectric weft detection device, the weft thread becomes finer denier, and malfunction increases as the loom rotation speed further increases.In addition, water is applied to the projector and the receiver, which causes malfunction or failure of the electric device. There was a problem of being.

The present invention solves the problems of the conventional photoelectric type weft detecting device, provides a weft detecting device capable of preventing malfunction and failure and detecting the weft with higher accuracy. Is an issue.

[0007]

In the weft detecting apparatus according to the present invention, a detection unit 2 having a light emitting portion end face 21a and a light receiving portion end face 22a opposed to each other is provided outside the selvage on the non-nozzle side of the woven fabric. In a weft detection device arranged at a position including a locus surface on which a weft moves at the time of beating, a light projecting end face 21a and a light receiving end face 22a are formed at the tips of the optical fibers 21 or 22 or an extension thereof. 22 is guided from the position on the counter-oscillation side of the detection unit 2 to the detection unit 2 located on the reed 7 side from the cloth fell 6.

In the above structure, an opening 9 through which the tip of the sensor holder 8 passes is provided in the facing portion of the sensor holder 8 that supports the optical fibers 21 and 22 of the fish 7, and the opposite sides of the sensor holder 8 are provided with the teeth 9. Weave 6 from 7
Space 1 located on the side and through which the fountain flows between
Thread guide 1 that moves with the back 7 in the state of forming 0
1 can be provided. Further, when the yarn guide 11 is provided, the detection unit 2 can be provided at a position retracted from the cloth fell to the opposite side.

[0009]

According to the above structure, the light emitting portion end surface 21a and the light receiving portion end surface 22a forming the detecting portion 2 are connected to the optical fiber 2
Formed at the tips of 1, 22 or an extension thereof, the projector 29
Further, since the light receiver 30 can be installed at a position separated from the weft insertion position on the side opposite to the back side, it is possible to avoid malfunction or failure caused by splashing water on the light projector 29 or the light receiver 30. Further, since the areas of the light emitting part end face 21a and the light receiving part end face 22a can be made smaller than those of the conventional device, the S / N ratio when the weft 12 passes through the detecting part 2 becomes large, and therefore a thin weft can be detected more reliably. can do.

Further, in the structure in which the yarn guide 11 is provided, the tip of the weft is held by the yarn guide 11 in front of the reel 7 at the time of beating, and the detecting portion 2 is earlier than the jet water 32.
Since a signal that is generated when the weft 12 passes and a signal that is generated when the jet water 32 collides with the detection unit 2 due to the passage of the weft yarn 12, a normal signal and a noise signal are generated depending on the output timing of the signal. Can be screened, and erroneous detection due to collision of jet water when there is no weft can be avoided.

When the yarn guide 11 is further provided and the detecting portion 2 is retracted to the opposite side of the cloth fell 6, the sensor holder 8 and the feathers do not interfere with each other at the time of beating, so that the leaf 7 is formed. An opening 9 for inserting the tip of the sensor holder 8
Since it is not necessary to provide the above, and since the detection unit 2 is further retracted from the passage of the jet water, the noise signal generated by the jet water can be further reduced.

[0012]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a sectional view of a sensor holder, FIG. 2 is a perspective view of a weft detecting portion, and FIG. 3 is a timing for detecting a weft. FIG. 2 and 3, the detection unit 2 of the weft detection device 1 of this embodiment is provided between the weaving selvage 4 and the catch cord 5 of the woven cloth 3 on the side opposite to the weft insertion nozzle, and between the cloth fell 6 and the hare 7.
It is located between the retracted position and. Weave 6 for Osa 7
When the blade is driven into the wing, the holder 8 of the feather and the weft detection device
An opening 9 is provided to avoid interference with the front surface of the lure, and a thread guide 11 formed of a wire material is provided on both sides of the opening 9 so as to separate the space 10 from the front surface of the lure. It is provided upright on a bracket 35 whose base end is fixed to the fish 7. The weft 12 is driven into a position between the yarn guide 11 and the weft detection device 1 when the recess 7 is in the retracted position.

In FIG. 1, a holder 8 of the weft detection device.
Is provided with a slit 13 that serves as a passage for the weft yarn tip at the center in the height direction on the side facing the recess 7, and a trumpet-shaped inlet 14 for guiding the weft yarn tip is formed in the slit 13. On the opposite side of the slit 13, there is formed a cavity 15 through which the tip of the weft after being driven is inserted, and the cutter is placed at a predetermined position while the tip of the weft is passing through this cavity 15. The tip of the weft thread is separated from the selvage selvage 4 by 16 and is wound around the catch cord 5. Slit 13
An optical path hole 17 penetrating vertically is provided at a substantially central portion of the optical fiber 2 and the optical path 2 is connected to the optical path hole 17.
Guide holes 18 and 19 for accommodating the distal end portions 1 and 22 are provided.

The tip end portions are inserted into the guide holes 18 and 19 and the tip end surfaces 21a and 22a are opposed to each other with the optical path hole 17 interposed therebetween.
The optical fibers 21 and 22 of the book pass through the grooves 23 and 24 provided at the upper and lower edges of the holder 8 and further through the vertical drawing holes 25 provided at the base end side of the holder 8 to be located above the base end portion of the holder 8. After being clamped by the clamp pipe 26 that is set up above the drawing hole 25, it is further drawn rearward, and its base end faces 21b and 22b are led 29a.
And is opposed to the phototransistor 30. The holder 8 is fixed to the loom with a screw inserted through a mounting hole 31 provided at the base end thereof.

The holder 8 used by the inventor of the present invention for the test
Is made of ceramic and has a vertical size of 25 mm, a thickness of 4 mm, and a front-back direction length of 53 mm. The slit 13 has a gap of 0.5 mm so that a water layer is retained in the slit 13. I have to.

Referring again to FIGS. 2 and 3, at the weft insertion timing, the front end of the weft 12 inserted between the yarn guide 11 and the weft detecting device 1 is moved forward by the forward movement of the reed 7 to form the reed 7. First, the yarn guide 11 moving forward together with the yarn guide 11 is moved forward while being stretched between the two yarn guides 11, 11 and guided by the inlet 14 of the holder 8 to be guided to the slit 13. Pass 2 Detector 2
The light of the LED 29 passes through the optical fiber 21, is projected from the front end surface 21a of the LED 29 to the front end surface 22a of the opposing optical fiber 22 through the optical path hole 17, and is guided to the phototransistor 30 through the receiving optical fiber 22. ing.

The weft thread passing through the slit 13 is detected by the detecting section 2.
The light beam from the LED 29 is momentarily blocked when the light beam passes through, and the light beam is blocked or scattered due to the disturbance of the water layer of the slit 13 accompanying the passage of the weft, and the output level of the phototransistor 30 is changed. fluctuate. Therefore, the presence or absence of the weft 12 can be detected by detecting the output fluctuation of the phototransistor 30 at the timing when the yarn guide 11 passes the position of the detection unit 2 of the weft detection device.

Water jet 32 used for weft insertion
Is flowing along the front surface of the tooth 7 after the weft insertion is completed, and therefore, the timing at which the jet water 32 passes the detection unit 2 of the weft detection device is delayed from the timing at which the weft tip passes the detection unit 2. Therefore, even if the output level of the phototransistor 30 fluctuates due to the water layer in the slit 13 being disturbed by the jet water 32 and the light beam from the LED 29 being shielded or scattered by the jet water 32, when the weft yarn passes and the jet water passes. It is possible to cancel the noise signal due to the jet water by utilizing the timing difference of 1.
It is possible to avoid erroneous detection due to a noise signal caused by the collision of the jet water 32 with the.

In the second embodiment shown in FIG. 4, the sensor holder 8 is provided at a position retracted from the cloth fell to the side opposite to the hook, and when the hook 7 reaches the most forward end, the front surface of the hook wing The position shown by the imaginary line 7 in the figure is reached, and the feather is the sensor holder 8
Has not reached the position. At this time, the thread guide 11 on the front side of the beast wing has advanced to the position of the void 15 of the sensor holder 8. That is, the feather and the sensor holder 8
Even if the positional relationship is such that does not interfere with, the tip of the weft yarn held by the yarn guide 11 on the front side of the beast wing passes through the detection portion 2 of the weft detection device and is guided to the void 15 of the sensor holder 8.

In the embodiment shown in FIG. 4, the slit 13 of the sensor holder through which the weft thread passes is provided obliquely to form the jaw 36 in the cavity 15, and the weft thread leading to the cavity 15 is When the thread guide 11 retracts, the slit 13
It has a structure that prevents it from coming off the empty space 15 through it.

[0021]

As described above, according to the weft detection device of the present invention, it is possible to prevent the electronic component used for detecting the weft from being exposed to the jet water for weft insertion. It is possible to prevent malfunction of the weft detection device and failure of the electric device. Also, because the detector can be made smaller,
Even when the weft is thin, it is possible to detect the weft with a high S / N ratio. And by adopting a structure in which the tip of the weft is guided to the detection part of the weft detection device by the yarn guide provided on the weave front side of the lure, the noise signal due to the collision of the jet water can be effectively cut, and the weft It is possible to prevent the weft presence signal from being output due to the collision of the jet water even if the weft does not exist, and it is possible to more accurately detect the presence or absence of the weft.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a first embodiment.

FIG. 2 is a perspective view of a portion where the weft detection device is mounted.

FIG. 3 is a plan view of the portion where the weft detection device is mounted when the weft is detected.

FIG. 4 is a sectional view showing an essential part of a second embodiment.

[Explanation of symbols]

 2 Detecting section 6 Weaving cloth 7 Oscillator 8 Holder 9 Opening 11 Thread guide 12 Weft 21 Optical fiber 21a Tip surface 22 Optical fiber 22a Tip surface 29 LED 30 Phototransistor 32 Jet water

Claims (3)

[Claims] 1. A weft yarn is moved when a detector (2), which has an end face (21a) of a light emitting part and an end face (22a) of a light receiving part facing each other, is beaten outside the selvage on the non-nozzle side of the woven cloth. In the weft detecting device arranged at a position including the trajectory surface, the light-transmitting end face (21a) and the light-receiving end face (22a) are formed at the tips of the optical fibers (21) and (22) or their extensions. 21), (2
2) is a weft detecting device characterized in that it is guided from the position on the anti-oscillation side of the detection part (2) to the detection part (2) located on the side of the back (7) from the cloth fell (6). 2. The optical fibers (21), (22) of the bag (7)
An opening (9) through which the tip of the sensor holder (8) passes is provided in the opposing portion of the sensor holder (8) that supports the sensor holder (8), and the weaving (7) 6) A thread guide (11) is provided which moves to the side (7) and moves together with the lure (7) in a state where a space (10) through which the jet water passes is formed between the yarn guide (11) and the lure (7). 1. The weft detection device described in 1. 3. A weft yarn detecting device in which a detecting portion (2), which is arranged so that an end surface (21a) of a light emitting portion and an end surface (22a) of a light receiving portion face each other, is arranged outside the selvage on the side opposite to the nozzle of the woven fabric. The detection part (2) is arranged on the extension surface on the cloth fell side of the locus surface on which the weft moves during beating, and the end surface of the light emitting part (21a) and the end surface of the light receiving part are
(22a) is formed on the tip of the optical fiber (21), (22) or on the extension thereof, and the optical fiber (21), (22) is
A sensor that guides the optical fiber (21), (22) from the position on the anti-oscillator side of (2) to the detection section (2) located on the anti-oscient (7) side of the cloth fell (6). When the holder (8) is located on the cloth fell (6) side of the hook (7) on both sides,
A weft detection device, characterized in that it is provided with a yarn guide (11) which moves with it.