SU924528A2 - Device for measuring tension of moving threads - Google Patents

Description

(54) DEVICE FOR MEASURING THE TENSION OF MOVING THREADS

The invention relates to measuring equipment used in the textile industry, and is intended to determine the tension of the yarns, which is used in primary converters of information from the automated process control system.

According to the main auth. No. 455256, a device for measuring the tension of moving filaments is known, comprising two photosensors, two sources of light energy, two amplifiers, a delay line, an adder, a multiplication unit and a recording instrument. The device makes it possible to measure the tension of moving threads of constant velocity with their movements tl.

The technological process in the textile industry, as a rule, is characterized by the instability of the speed of movement of textile yarns. Therefore, due to the fact that the delay line in the main device is made with a constant lag time C const, the device adder will not have the simultaneous appearance of two signals from the single sections of the thread thickness monitored by photosensors. The signals are shifted in time r + l, where 1 const, and

The t4i var, and this in turn, leads to incorrect results of the measured tension of the moving threads.

The purpose of the invention is to expand the functional capabilities of the device, namely, measuring the tension of the threads at the pulsating speed of their movement.

This cer is achieved by

10 that a coincidence circuit and an integrator were introduced into the device for measuring the tension of moving threads, and the delay line is made in the form of a block with an adjustable pin, and the output

15 of the second amplifier in the direction of movement of the thread is connected to one of the inputs of the coincidence circuit, the output of the adjustable delay unit is connected to another input of the coincidence circuit, the output of which is connected through the integrator; control input of an adjustable delay unit.

The drawing shows a block diagram of a device according to the present invention.

The device comprises a photosensor 1 connected via an amplifier 2 to one of the inputs of the adder 3 and a scheglle of 4 matches, a photosensor 5 connected

30 through amplifier 6 and block 7 of adjustable delay with a different input of the adder 3 and circuit 4 matches. The output of the adder 3 is connected to the input of the multiplication unit 8, the output of which is connected to the input of the registering device 9. The output 4 of the coincidence circuit is connected via the integrator 10 to the control input of the adjustable delay unit 7.

The device works as follows.

During the movement of the filament, the light fluxes of photosensors 1 and 5 overlap. Their signals are amplified by amplifiers 2 and b and fed to the inputs of the adder 3 and the coincidence circuit 4 / and the signal from the output of amplifier b is delayed in the adjustable delay unit 7. From the adder 3, the signal enters the multiplication unit 8, where it is multiplied by the modulus of elasticity and the thickness of the thread. The change in the tension of the thread is recorded by the registering device 9. With the help of the adjustable delay unit 7 and the adder 3, the error of the uneven thickness of the thread is eliminated. From the output of the coincidence circuit 4, the voltage is integrated in the integrator 10, after which it is fed to the control input of the unit 7 of the adjustable delay. In case of equal running time between the sensors 1 and 5 of the thread section of the same name, the value of the delay time in the adjustable delay block 7, a certain voltage is present at the output of the coincidence circuit 4. In the case of a change in the speed of movement of the filament (increase or decrease), the time is also changed accordingly; the distance between the sensors 1 and 5 of its homogeneous sections of thickness changes, which causes a mismatch in the matching of the signal in the scheme 4 of coincidence, and this in turn leads to a change the voltage at the output of the last, and accordingly, the integrator 10, which affects the control input of the adjustable delay unit 7, thereby changing the delay time of the signal from the output of the sensor 5. Therefore, it is automatically regulated and the delay time of the signal coming from Sensor 5 creates the possibility of measuring the tension of a moving thread during its pulsation of the speed of its movement.

0 The use of the proposed device allows you to quickly obtain information about the tension of the threads moving with both constant and variable speeds of motion.

5 And this makes it possible to use it not only in the laboratory, but also under production conditions for the current control of the technological processes of spinning and weaving.

0

Claims (1)

1. Copyright, USSR certificate 455256, cl. From 01 L 5/10, 1975. A thread /