JPS6017740B2 - Yarn running detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a yarn running detection device in a textile machine, and more particularly to a device that detects yarn running based on fluctuations in the charged potential of a running yarn.

In the textile process, yarn breaks that occur during the operation of various textile machines can cause the machine to stop, reducing operational efficiency, and can also wrap around rotating parts, leading to accidents, so it is important to prevent this problem as soon as possible. It needs to be discovered and reported.

By the way, these thread breaks have conventionally been detected by mechanical means using lever movements, by microswitches with electrical contacts, and electronically by piezo effect, piezo effect, etc.
There was a means of detection using electromagnetic effects, and a means of optical detection.

However, all of these detection means have advantages and disadvantages; for example, mechanical means have a slow response speed, electronic means are expensive, and other than optical means, there is no mechanical contact with the thread. There were drawbacks such as the need to detect the current state. Therefore, in order to solve this problem, it was considered to detect yarn breakage by detecting fluctuations in the charged potential of the yarn, but the fluctuation signal was extremely weak, whereas the noise signal in the factory was relatively large. This method was not put into practical use due to the high temperature of the factory atmosphere during the textile process.
The present invention was made in view of the current situation, and its purpose is to provide a yarn running detection device that has an accurate detection function, a long response speed, and is less affected by temperature and humidity. It is in.

Another object of the present invention is to provide a device capable of detecting yarn running without contacting the yarn.
Still another object of the present invention is to provide a yarn running detection device that has a simple structure, can be miniaturized, and is inexpensive to manufacture.

In order to achieve the above object, the present invention provides a method of attaching a sensitive electrode having a high power supply property to the ground near the running yarn, and integrally connecting this sensitive electrode with a high input impedance intensifier. In addition, it is characterized by a configuration in which the sensitive electrode and the ground are covered with a stream-like insulator, and due to this configuration, the weak signal of the fluctuating electric potential of the thread can be detected by a high input impedance intensifier. As well as being increased in intensity,
Noisy electrical signals drifting within the factory are restricted to large areas,
It is a practical device that can obtain an output signal with a high signal-to-noise ratio, and can also eliminate the effects of humidity by covering the gap between the sensitive electrode and the ground with a water-repellent insulator. be.

Hereinafter, the present invention will be explained based on illustrated embodiments.

In the figure, the thread 1 is held by guides 2, 2' and runs opposite the sensitive electrode 3.

The sensitive electrode 3 is printed on the same printed circuit board 5 as the other printed wiring 4, and is directly connected and soldered to the input terminal 7 of the high input impedance multiplier S. The signal is connected to a power supply section 9 and a display device Q via a lead wire 8.The printed circuit board 5 is fixed to a metal outer box 11';
11 The structure is such that a surface 12 facing the thread 1, that is, a portion corresponding to the sensitive electrode 3, is hollowed out, and the other portion electrostatically shields the printed circuit board 5. In addition, the insulating parts 3 between the sensitive electrodes 3 of the printed circuit board 5 and other printed wiring 4 are coated with a water-based paint such as fluorine resin or silicone resin to reduce the amount of paint applied. is formed, and when the surface of the water vapor coating surface 14 is covered with a water vapor layer, water molecules are separated into small water droplets 16 due to the water vapor properties, and a ground potential is present on the opposing surface 2. It is designed to prevent

That is, if a water droplet layer with a ground potential exists on the facing surface 12, the charged potential of the thread 1 is absorbed by the ground surface of the water droplet layer, and the amount of dielectricity with respect to the sensitive electrode 3 is greatly reduced. 1
The water vapor adhering to 4 is separated into small water droplets 6, and therefore, each small water droplet 6 separated from the grounding point of the outer box Fuki etc. becomes a mere medium care electric body and transmits the charged potential of the thread turtle to the sensitive electrode 3. It is not an obstacle to do so. Further, the hair water-coated wings 5 of the insulating section 3 are provided to maintain the highly insulating layer of the sensitive electrode 3, thereby maintaining the ability to detect yarn running.

In other words, ``The charged potential of a thread turtle is a high potential that sometimes reaches several thousand volts, but the amount of charge is minute.''Therefore, the sensitive electrode 3 has an extremely high insulation resistance and a function that increases this potential fluctuation. The intermediate unit 6 also needs to have a high input impedance, and in experiments, it has been put into practical use with a high input impedance of more than a few megohms and a multiplication factor of about 500 tones. Even if factories such as the above are operated in a high temperature atmosphere, deterioration of insulation due to the adhesion of water droplets will significantly reduce the detection ability. is formed, the highly insulated electrode of the sensitive electrode 3 is maintained and the detection ability does not deteriorate. The sensitive electrode 3 printed on the printed circuit board 5 is connected to the gate of the field effect transistor 17, and also connected to the bias leakage resistor 18 of the field effect transistor turtle 7.
0, 20', and an output terminal 21 are provided, and these three terminals are connected to a lead wire 8.

Then, a yarn running signal is obtained from the emitter terminal of the field effect transistor 17, and is added to the input of the oven amplifier IC 9 to increase the output, and the output signal operates the indicator turtle 8 to display yarn breakage.

In any of the above embodiments, if the printed circuit board 5 itself is made of a water-based resin such as Teflon, the formation of the Aoi water-painted wings 4 and turtle 5 is not necessary, and the manufacturing cost can be further reduced. It is.

However, according to the present invention, a sensitive electrode having high insulation properties with respect to the ground is provided in close proximity to the running thread, and this sensitive electrode and a high input impedance intensifier are integrally connected. It detects fluctuations in the charging potential of the running yarn and uses the output signal of the high input impedance intensifier to detect yarn running, so even if the fluctuation signal of the charging potential of the running yarn is weak, Even if the noisy electrical signals in the factory are limited to a high degree, an output signal with a high signal-to-noise ratio can be obtained. ``and can be detected quickly.''

In addition, according to the present invention, ``Since the area between the sensitive electrode and the ground is covered with a mineral water-based insulator, there is almost no effect of fishing humidity,'' and ``even if the factory atmosphere is high temperature, It is possible to accurately detect yarn running without being affected by the

Further, the yarn running detection device according to the present invention has advantages such as having a simple structure, being able to be miniaturized, and being able to be provided at low cost, and the industrial value obtained by the present invention is remarkable.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is an overall sectional view;
FIG. 2 is a plan view showing another example. 1... Thread, 3... Crying 6, Electrode, 5.
...Printed circuit board, 6...High input impedance intensifier 14, 15...Twill water painted surface. Figure 1 Figure 2

Claims (1)

[Claims] 1. A sensitive electrode having high insulation properties with respect to the ground is provided adjacent to the running thread, and this sensitive electrode and a high input impedance amplifier are integrally connected, and the above-mentioned A yarn running detection device characterized by a structure in which a sensing electrode and a ground are covered with a water-repellent insulator. 2. The yarn running detection device according to claim 1, wherein the sensing electrode is printed and wired on a printed circuit board made of water-repellent resin.