JPH05156548A - Method for preventing breakage of band of band rapier loom and apparatus therefor - Google Patents

Abstract

PURPOSE:To prevent the breakage of a band of a band rapier loom and prevent the damage of warp. CONSTITUTION:The temperature of a reciprocating band of a band rapier loom is detected and the loom is stopped when the detected temperature reaches a prescribed level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band breaking preventing method and device for a band rapier loom.

[0002]

2. Description of the Related Art In a band rapier loom, the reciprocating back and forth movement of a band is carried out by engaging a tooth portion of a drive wheel with a hole formed in the band and rotating the drive wheel forward and backward. Since a centrifugal force acts on the band when the band wheel rotates, the band tries to separate from the tooth portion.Therefore, a band guide is provided on a part of the outer periphery of the drive wheel to suppress this. ..

[0003]

By the way, the reciprocating band always contacts the drive wheel to generate frictional heat. Usually, the frictional heat and the heat radiation are in equilibrium, so that the temperature of the band is stabilized at a predetermined temperature. However, if the band is used for a long period of time, the teeth of the band and the drive wheel will wear, the band will rise above the bottom of the teeth of the drive wheel, and the contact pressure with the band guide will increase further.
As a result, since the band is usually made of a material such as synthetic resin, when the balance between heat generation and heat dissipation due to an increase in frictional heat cannot be maintained, the temperature of the band rises and the band expands, further The contact pressure with the guide is increased, and the frictional heat is rapidly increased. Due to the increased frictional heat, the band is finally softened, deformed, and thermally deteriorated to break. Then, an accident such as the breaking band coming into contact with the warp and cutting the warp occurs.

This invention focuses on the fact that the surface temperature of the band rises rapidly just before the band breaks, detects the rise in the surface temperature of the band, and stops the loom before it breaks to stop the band. The purpose is to prevent accidents due to breakage.

[0005]

In order to achieve the above object, the method for preventing band breakage of a band rapier loom of the present invention detects the surface temperature of a reciprocating band, and the detected surface temperature reaches a preset value. It is characterized by stopping the loom when it is reached.

An apparatus for carrying out the above method is
It has a temperature sensor for detecting the surface temperature of the reciprocating band, and a detection circuit for comparing the detected band surface temperature with a preset value and outputting a stop signal to the loom controller when the temperature is larger than the set value. It is characterized by

[0007]

According to the present invention, the surface temperature of the reciprocating band is detected by the temperature sensor, and the loom stop signal is output when the surface temperature detected thereby reaches a value preset in the detection circuit.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a drive wheel 1 rotatably supported at a predetermined position of a mounting frame F is engaged with a band 3 to which a rapier head (not shown) is connected. Band guides 5A and 5B are provided on the outer periphery of the drive wheel 1 so as to cover the outer periphery of the drive wheel. One of the band guides 5A has a through hole 51 formed at a predetermined position in one of the band guides 5A, and a detecting portion (for example, a thermocouple) 7 is embedded in the through hole 51. ing. In FIG. 2, reference numeral 8 is a heat-resistant resin material for fixing the detecting portion 7 inside the through hole 51.

The value detected by the detector 7 (temperature Δ
t) is input to the amplifier 11 and amplified to t1, and then output as a temperature signal toward one input terminal of the comparator 13. The other input terminal of the comparator 13 is connected to the output terminal of the setter 15, and the value t1 of the temperature signal sent from the amplifier 11 and the value t preset in the setter 15 are connected.
Compare with 0. Then, when the value t1 of the temperature signal is higher than the set temperature value t0, the loom stop signal is output to the loom controller.

The band guide 5 is provided with the detection unit 7 as described above.
When embedded in A, the temperature inside the band guide is inevitably lower than the band surface temperature, so it is necessary to amplify the detection value by the amplifier 11, but if the detection accuracy of the detection unit is extremely high, the direct comparator is used. To temperature signal t1
As a matter of course, it is possible to input.

In the above description, the detection part 7 is embedded in the band guide 5A, but the invention is not limited to this, and it may be embedded in the drive wheel 1. It goes without saying that the band guide in which the detection unit 7 is embedded may be the side band guide 5B.

Further, the detecting section may be composed of an infrared thermometer instead of the thermocouple as described above.
In this case, if it is near the surface of the band 3 near the drive wheel 1, its installation position does not matter.

[0013]

According to the present invention, when the temperature of the band is suddenly increased, it is detected. Therefore, the breakage of the band due to the thermal change can be predicted, and the loom is stopped in advance based on the detected information. As a result, the band is prevented from breaking and coming into contact with the warp and cutting the warp.

Further, the fact that the detected temperature rise can be detected has the meaning of detecting that the band is worn, so that the replacement time of the band can be easily determined.

[Brief description of drawings]

FIG. 1 is a perspective view showing the vicinity of a band breaking prevention device of a band rapier loom of the present invention.

FIG. 2 is a cross-sectional view showing the periphery of the band breakage preventing device of the band rapier loom of the present invention.

[Explanation of symbols]

 1 Drive Wheel 3 Bands 5A, 5B Band Guide 7 Detector (Thermocouple) 8 Heat Resistant Resin 11 Amplifier 13 Comparator 15 Setting Device

Claims (6)

[Claims] 1. A band rapier loom, wherein the temperature of a reciprocating band is detected and the loom is stopped when the detected band temperature reaches a preset value. Method. 2. In a band rapier loom, a temperature sensor for detecting the temperature of a reciprocating band and a detected band temperature are compared with a preset value, and a stop signal is sent to the loom controller when the temperature is larger than the preset value. A band breaking prevention device for a band rapier loom, comprising: a detection circuit for outputting. 3. The apparatus according to claim 2, wherein the temperature sensor is embedded in a predetermined position of the band guide. 4. The device according to claim 2, wherein the temperature sensor is embedded in a predetermined position of the drive wheel. 5. Device according to claim 2, 3 or 4, characterized in that the temperature sensor is a thermocouple. 6. The apparatus of claim 2, wherein the temperature sensor comprises an infrared thermometer.