JPH09158005A - Woven fabric-detecting device in loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new woven fabric-detecting device capable of simply, inexpensively and accurately judging the presence of a weft instead of a conventional weft-detecting device, especially a weft-detecting device utilizing an optical means. SOLUTION: Web vibration-detecting means 6, 7 comprising a contact pin 13 attached to a plate spring 14 and being in contact with a woven fabric 5, and a strain gauge disposed on the plate spring 14, and a means for judging the presence of the weft of a loom from the output signal wave shape of the vibration-detecting means 6, 7 are disposed near the cloth fell of the loom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a woven cloth detecting device for a loom, and in particular, a vibration detecting means including a strain gauge and an acceleration sensor is provided in the vicinity of the cloth fell, and an output waveform from the vibration detecting means is provided. Accordingly, the present invention relates to a woven fabric detection device that determines the presence or absence of a weft yarn when weft insertion.

[0002]

2. Description of the Related Art Hitherto, a photoelectric weft detecting device has been mainly used in a high-speed loom. This type of weft detection device projects light from a light projector onto a weft, receives reflected light from the weft by a light receiver, detects the weft by the presence or absence or strength of the reflected light, and is shielded by the weft. Depending on the intensity of transmitted light, it is roughly classified into a method of detecting weft.In such a type of weft detection device, it is inevitable that noise is mixed into the feeler signal from the light receiver due to various causes. In particular, in a water jet loom, when a water jet for transporting a weft enters a detection area, the water jet becomes a kind of disturbance, and a detection malfunction is easily caused.

[0003]

SUMMARY OF THE INVENTION The present invention overcomes the deficiencies of conventional devices by providing a novel woven fabric detection device, and in particular, a new detection device that replaces the weft detection device utilizing optical means. At the same time, the present invention provides a woven fabric detection device that is simple, inexpensive, and capable of accurately determining the presence or absence of weft yarns.

[0004]

SUMMARY OF THE INVENTION The present invention provides a woven fabric detecting device that solves the above problems, and a contact pin that is attached to a leaf spring and comes into contact with a woven fabric in the vicinity of the cloth fell portion of a loom. A vibration detecting means for a cloth, which is a strain gauge provided on a leaf spring, and a means for judging the presence or absence of a weft yarn of a loom from the output signal waveform of the vibration detecting means are provided.

Further, the vibration detecting means is provided on a sensor arm which extends from the supporting arm of the temple in the width direction of the woven fabric and whose distance can be adjusted through a sensor guide which can adjust the distance in the height direction. It is a thing. Further, the vibration detecting means is provided on the temple engaging area of the woven fabric in the direction close to the cloth fell portion and in a direction coinciding with the moving direction of the woven fabric.

In addition, a sensor mounting plate having an acceleration sensor attached to a vibration detecting plate having a U-shaped cross section and a cover plate of the sensor mounting plate are provided in the vicinity of the cloth fell portion of the loom. The weft detection means is composed of a sensor that detects the amount of vibration change of the vibration detection plate and generates an output signal, and the determination means that determines the presence or absence of the weft of the loom from the output signal waveform of the detection means.

Further, as the judging means, means for comparing the output signals from the vibration detecting means provided on both sides of the loom to judge normality or abnormality, or a basic output waveform when the weft is normal and the vibration detecting means It is provided with means for comparing output waveforms and determining normality or abnormality.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a strain gauge provided on a leaf spring and a contact pin attached to the leaf spring in the vicinity of the cloth fell portion of the loom. A mechanical operation state monitoring device for a loom, comprising: a vibration detection means for the cloth, and a determination means for determining the presence or absence of the weft of the loom from the output signal waveform of the vibration detection means. A change in the vibration of the woven cloth is detected by a contact pin provided in the vicinity of the cloth fell, and this is output as a vibration signal via a strain gauge, and the presence or absence of the weft is detected by this output signal.

According to a second aspect of the present invention, the vibration detecting means extends from the supporting arm of the temple in the width direction of the woven fabric, and the sensor arm provided so as to be able to adjust the interval has a sensor capable of adjusting the interval in the height direction. The woven fabric detection device for a loom according to claim 1, wherein the vibration detection means is provided via a guide, and the vibration detection means is provided on the temple engagement area of the woven fabric. 2. The woven fabric detecting device for a loom according to claim 1, wherein the woven fabric detecting device is provided in a direction close to the section and in a direction coinciding with a moving direction of the woven fabric. It is provided in the vicinity and detects the presence or absence of the weft by detecting the change in tension immediately after weaving the woven fabric.

According to a fourth aspect of the present invention, there is provided a sensor mounting plate in which an acceleration sensor attached to a vibration detecting plate having a U-shaped cross section is attached in proximity to the cloth fell portion of the loom, and the sensor mounting plate. A weft detection unit, which consists of a cover plate of the plate, detects the amount of change in vibration of the vibration detection plate and generates an output signal, and a determination unit that determines the presence or absence of the weft yarn of the loom from the output signal waveform of this detection unit. A device for detecting a cloth in a loom, which is characterized by being provided, and has a configuration capable of more sensitively detecting a change in cloth tension by using an acceleration sensor.

Further, in the invention described in claim 5, the weft presence / absence judging means compares the output signals from the detecting means provided on both sides of the loom. Is a weaving cloth detection device in a loom according to any one of claims 1 to 3, and the invention according to claim 6 is characterized in that the weft presence / absence determining means is stored in advance. The reference output waveform when the weft is normal and the output waveform from the detection means are compared, and when they match, it is judged to be normal, and when they do not match, it is judged to be abnormal. 4. The woven fabric detection device for a loom according to 4, wherein each of the woven fabric detection devices is characterized by a determination unit that determines the presence or absence of a weft by using an output waveform output from the vibration detection unit.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a plan view showing an example of a loom equipped with the woven cloth detecting means of the present invention, and FIG. 2 is a block diagram showing an example of the woven cloth detecting means. In the drawing, the weft 1 is jetted from a nozzle 2 with a water flow or an air flow, weft-inserted into the opening of the warp 3, and the weft 1 is driven by a reed 4 to form a cloth 5. This operation is performed in synchronism with the rotation of the main shaft of the loom, the weft 3 is sent from the warp delivery device in synchronism with the rotation of the main shaft of the loom, and the cloth 5 is synchronized with the rotation of the main shaft of the loom by the winding device. The warp yarn 3 is wound up by a predetermined tension.

In the present embodiment, the tension on one side or both ends of the cloth 5 near the cloth fell is detected by the vibration detecting means 6 and 7 composed of strain gauges or acceleration sensors, and the vibration detecting means 6 and 7 detect the vibration. The signal is amplified by the preamplifiers 8 and 9, and the history presence / absence determining means 10 including a waveform analysis circuit A
After conversion into digital signals by the / D converters 11 and 12, waveform analysis is performed to determine the presence or absence of weft yarns in the loom.

The cloth 5 detected by the vibration detecting means 6 and 7
The tension on both end portions near the cloth fell changes depending on the tension of the warp threads 3, the weft insertion state of the weft threads 1, and the like. Therefore, the waveform analysis circuit 10 analyzes the waveforms of the vibration detection signals from the vibration detection means 6 and 7 according to the operation of the loom (according to the rotation angle of the main shaft) to determine the presence or absence of wefts when weaving the weaving machine. to decide. When the weft 1 is driven by the reed 4, the vibration propagating on the cloth 5 is detected by the vibration detecting means including strain or acceleration sensors 6 and 7 provided on one side or both sides near the cloth fell. The detected signal is amplified by the preamplifiers 8 and 9,
The A / D converters 11 and 12 of the weft insertion state determination means of the weft 1 made of the waveform analysis circuit 10 convert the signals into digital signals and perform waveform analysis to determine whether the weft insertion is good or bad.

The waveform of the vibration detected by the vibration detecting means including the strain gauge or the acceleration sensors 6 and 7 changes depending on the weft insertion state of the weft 1. Therefore, the waveform analysis circuit 10 analyzes the waveforms of the detection signals from the vibration detection means 6 and 7 according to the operation of the reed (depending on the rotation angle of the main shaft of the loom) to determine the weft insertion state. For example, the waveform analysis circuit 1
0 is the vibration detecting means 6, 7 as shown in FIGS. 3 and 4.
The two vibration detection signals from the above are digitized, stored in the storage means, and subjected to waveform analysis. For example, the two signal waveforms are compared. Is stopped and the contents are displayed on the display means.

Further, the waveform analysis circuit 10 detects the vibration when the weft insertion is normal in accordance with the beating cycle in advance, stores this detection signal in the non-volatile memory, and detects the detection means 7 (nozzle 2).
The vibration waveform detected by the above process is stored in the storage means in the above process and compared with the signal when the weft insertion is normal. If they do not match, weft insertion failure has occurred. It is determined that the loom is stopped, and the loom is stopped and displayed on the display means.

Further details will be described with reference to FIG. FIG. 5 shows an output waveform detected by the vibration detecting means. The output waveform detected by the strain gauge is shown in FIG. 5 (a), and the output (h) when weft insertion is abnormal is smaller than the reference output (H) when weft insertion is normal during beating. By comparing the output values of both output waveforms, it is possible to determine whether weft insertion is normal or abnormal.

The waveform shown in FIG. 5 (b) is a waveform detected by the acceleration sensor. At the time of beading, the reference output waveform when the weft insertion is normal has a continuous small peak at the shoulder of the peak. On the other hand, the output waveform at the time of weft insertion abnormality has only one peak,
Whether the weft insertion is normal or abnormal can be determined by detecting whether or not the output waveform detected by the vibration detecting means has a continuous small peak at the shoulder of the peak.

Next, a specific example of the vibration detecting device of the present invention will be described. As shown in FIGS. 6 and 7, temples 18 are provided at both end portions near the cloth fell of the loom. The temple 18 is a support arm 1 of the temple bracket 25.
It is attached to 7 by a screw 22 via a top 20 so as to be adjustable. A temple ring 19 is rotatably attached to the head portion of the temple 18, and a large number of needles 34 project from the ring 19. Below the temple 18, a temple cover 23 having a U-shaped cross section is arranged. Cloth 1
5 is wound up by the cloth winding device through the upper end of the temple cover 23 and the guide portion of the temple bracket 25 near the cloth fell, but is pressed downward in the temple cover 23 by the temple 18 and the temple cover 23 and the temple cover 23. It is pressed downward by the temple 18 between the guide portion of the bracket 25.

FIG. 8 shows one mode of the vibration detecting device of the present invention. In FIG. 8, 16 is a sensor arm fixed to the support arm 17 by a screw 22, and extends toward the center of the loom. The sensor arm 16
The end part of is bent upward in an L shape, and the bent part is L-shaped.
The character-shaped sensor guide 15 is fixed by screws. A leaf spring 14 having a contact pin 13 at the tip and a strain gauge 6 and 7 fixed to the center is attached to the bent portion of the sensor guide 15. The sensor arm 16 of the vibration detecting means has an elongated hole (not shown) in the center.
Is provided and the attachment position is changed by the screw 22, the position of the contact pin 13 is appropriately selected, and the screw 22 is fastened to the support arm 17 together with the temple. The position of the sensor guide 15 is adjusted with respect to the sensor arm 16 and is fixed by a screw so that the contact pin 13 can detect the vibration of the cloth 5.

As described above, the leaf spring 14 is provided with the cloth contact pin 13 at the tip thereof, and detects the vibration on the cloth 5 to bend the leaf spring 14. Since the strain gauges 6 and 7 are attached to the leaf spring 14, the strain gauges 6 and 7 receive the stress due to the bending of the leaf spring 14 and are distorted, and the vibration of the cloth 5 is detected. (Second Embodiment) FIG. 9 is a side view showing another embodiment of the vibration detecting means. In this embodiment, the sensor arm 16 is provided so as to extend from the support arm 17 in the moving direction of the woven fabric, and the sensor guide 15 is fixed to the sensor arm 16 so as to be vertically adjustable. The lower end of the sensor guide 15 is bent in an L-shape, and a leaf spring 14 having a contact pin 13 at the tip and a strain gauge 6 and 7 fixed to the center is fixed to the bent portion.

In this embodiment, the vibration detecting means is aligned with the moving direction of the cloth 5, the strain gauges 6 and 7 are installed as close as possible to the cloth fell portion of the cloth 5, and the presence or absence of the weft thread is detected. The judgment area of is expanded. FIG.
Reference numeral 0 indicates another embodiment of the vibration detecting means, and (a)
Is a side view, and (b) is a partially enlarged view of a detection portion. In this embodiment, 26 is a lever block, 27 is a temple guide, and 28 is a touch lever. As is apparent from the drawing, in this embodiment, the touch lever having the tip of the cloth contact portion 29 forming the detection portion is provided to extend from the lever block 26 to the front of the temple, and the temple is attached to the temple. The contact portion 29 is provided along the tip of the bent portion. Therefore, the contact portion 29 is located close to the cloth fell along the temple, that is, the cloth 5
Since it can be installed in the region where the vibration propagating to the strongest, the change in the vibration can be detected sensitively.

Further, although the strain gauge is used in the above embodiment, the weft insertion state can be determined by installing the microphone at the same position and performing the same process. (Embodiment 3) FIGS. 11A and 11B show still another embodiment of the vibration detecting means. FIG. 11A is a front sectional view and FIG. 11B is an exploded perspective view. This embodiment is characterized in that an acceleration sensor is used in place of the strain gauge as a sensor. In the figure, 30 is a sensor mounting thin plate, 31 is an acceleration sensor, 32 is a vibration detection plate, and 33 is an upper lid.

The vibration detecting plate 32 is formed in a U-shaped cross section,
A guide portion 34 for mounting is integrally provided on the rear portion. The sensor mounting thin plate 30 to which the acceleration sensor 31 is attached is attached to the vibration detecting plate 32, and the upper surface of the sensor mounting thin plate 30 is covered with the upper lid 33.
The sensor mounting thin plate 30 and the upper lid 33 are integrally fixed with screws to form a vibration detecting means.

In this embodiment, the vibration detecting means is formed compact as a single unit, and the mounting guide portion 34 is provided.
Thus, the loom can be installed at any place, and the vibration of the cloth can be sensitively detected by using the acceleration sensor.

[0026]

As described above, according to the present invention, whether the weft insertion is normal or abnormal at the time of weaving is detected by the vibration of the sensor propagating to the woven cloth, and the output waveform from the sensor is identified. Therefore, it can be performed easily and can be realized at a lower cost than the conventional detection means.

Further, the detecting means can freely change the mounting direction and the position before and after the temple, and can easily change the mounting position according to the type of the loom and the characteristics of the woven cloth. Further, in order to attach the detection device, it is not necessary to remove the lead of the reed as in the conventional device. Further, in the optical weft detecting device used in the conventional water jet loom, erroneous detection may occur due to the influence of water, but according to the present invention, it is not affected by water at all. It is possible to detect weft.

Further, in these conventional devices, there was a problem that the electrodes were damaged by electrolytic corrosion during long-term use, but according to the present invention, such a problem does not occur and long-term use is possible. .

[Brief description of the drawings]

FIG. 1 is a plan view of a loom equipped with a woven fabric detection device of the present invention.

FIG. 2 is a block diagram of a woven fabric detection means.

FIG. 3 is a flowchart showing a processing flow of a waveform analysis circuit.

FIG. 4 is a flowchart showing a processing flow of another waveform analysis circuit.

FIG. 5 is a waveform diagram detected by a sensor.

FIG. 6 is a perspective view showing the vicinity of a temple.

FIG. 7 is a side view showing the vicinity of the temple.

FIG. 8 is a front view of the embodiment of the present invention.

FIG. 9 is a side view of another embodiment of the present invention.

FIG. 10A is a side view of another embodiment of the present invention, and FIG.

FIG. 11A is a front view of another embodiment of the present invention. (B) An exploded perspective view.

[Explanation of symbols]

 1 Weft 2 Nozzle 3 Warp 4 Reed 5 Cloth 6 Strain gauge 7 Strain gauge 8 Preamplifier 9 Preamplifier 10 Waveform analysis circuit 11 A / D conversion 12 A / D conversion 13 Contact pin 14 Leaf spring 15 Sensor guide 16 Sensor arm 17 Support arm 18 Temple 19 Temple ring 20 Top 21 Long hole 22 Screw 23 Temple cover 24 Long hole 25 Temple bracket 26 Lever block 27 Temple guide 28 Touch lever 29 Contact part 30 Sensor mounting guide plate 31 Acceleration sensor 32 Vibration detection plate 33 Upper lid 34 Guide part

Claims (6)

[Claims] 1. A vibration detection device comprising a contact pin that is attached to a leaf spring and comes into contact with a woven fabric in the vicinity of a cloth fell portion of a loom, and a sensor that detects a vibration change amount of the contact pin and generates an output signal. A woven fabric detection device for a loom, comprising: a means and a determination means for determining the presence or absence of a weft when the weft is inserted into the weaving machine from the output waveform of the detection means. 2. The vibration detecting means is provided on a sensor arm which extends from a supporting arm of the temple in the width direction of the woven fabric and whose distance can be adjusted, through a sensor guide which can adjust the distance in the height direction. The woven fabric detection device in a loom according to claim 1, wherein 3. The loom according to claim 1, wherein the vibration detecting means is provided on the temple engaging area of the woven fabric in a direction close to the cloth fell and in a direction coinciding with a moving direction of the woven fabric. Woven fabric detection device. 4. A sensor mounting plate, which is attached to a vibration detecting plate having a U-shaped cross section and is provided with an acceleration sensor, and a cover plate of the sensor mounting plate, the sensor mounting plate being close to the cloth fell portion of the loom.
The loom is provided with a vibration detecting means including a sensor for detecting an amount of change in vibration of the vibration detecting plate and generating an output signal, and a judging means for judging the presence or absence of the weft of the loom from the output waveform of the detecting means. Woven fabric detection device. 5. The weft presence / absence determining means compares the output waveforms from the vibration detecting means provided on both sides of the loom, and determines that the waveforms are normal when they match and abnormal when they do not match. The woven fabric detection device in a loom according to claim 1, 2, 3, or 4. 6. The weft presence / absence determining means compares a pre-stored reference output waveform when the weft is normal with an output waveform from the vibration detecting means, and when both are in agreement, it is normal, and when they are not in agreement, it is abnormal. The judgment is made according to Claims 1, 2, 3
Or the woven fabric detection device in the loom according to 4.