SU1183898A1 - Device for monitoring twisting of textile fibers - Google Patents

Description

The invention relates to the field of research properties of textile materials, namely to determine the crimpiness of textile fibers.

The purpose of the invention is to increase the accuracy of the curvature of the fibers.

The drawing shows a block diagram of the proposed device.

The device contains a means of loading, consisting of a vertically located and coaxially mounted electric drive 1 of a straight-forward translational motion and a tension spring 2, as well as a movable clamp 3 rigidly connected to the stretch spring 2, a fixed clamp 4, a curtain 5 rigidly connected with the movable clamp 3, the illuminator 6 with the photocell 7 and the stop 8, providing the initial position of the movable 20 clip 3. The electrical circuit includes a photoelectric converter 9 and a block 10 for monitoring the fiber extension increment, consisting, for example, from a capacitor and an analog-to-digital-25 converter (ADC), connected in series.

Moving the movable clamp 3 is fixed by the recorder 11. The differentiation unit 12 through the amplifier 30 connects to the Schmitt trigger 14, which limits the output signal from the amplifier 13 to the level corresponding to the output pulse of the differentiation unit 12 (ie, 0 or 1). 35

Next, a pulse arrives at a pulse shaper 15 connected to one of the inputs of the inhibit logic 16, the other input of which is connected to a shaper .40 17 pulses connected to a pulsed rotor position sensor 18 of the drive rotor mechanically connected to the drive 1.

The output of the element 16 is connected to the forwarder 19 pulses, which through the switching element 20 is connected to the stop relay 21 of the drive control unit 1

The device works as follows 50 times.

The test specimen 22 is charged in the movable 3 and fixed 4 clamps with a given pre-tension, while the movable clamp 55 rests against the abutment 8.

Include drive 1 straight motion, which

starts. lowering the spring 2 stretching with a rigidly connected with the movable clamp 3, after which straightening of the sample 22 begins. When this photoelectric converter 9 produces an analog signal, the value of which is proportional to the absolute elongation of the fiber

The extension is fixed by the recorder 11. The analog signal from the converter 9 is supplied to the extension increment control unit 10, consisting of an ADC that allows converting the analog signal into pulses, the duration and period of which are set by a pulse rotor position sensor 18 and a storage capacitor that is discretely charged to values corresponding to the values of the analog signal from the transducer 9 in these periods of time (respectively pulses). Next, the signal enters the block 12 of differentiation.

The processes occurring in this block are as follows.

When applying a signal from the converter 9 through the ADC to the storage capacitor, the original voltage value U is saved at the latter if the second value of the analog signal from the converter

(1 _{2 is} greater than U on AN, due to transients in block 12 of differentiation, the value of a1! Goes to amplifier 13. If the value is U, then & 11 = 0, this means that the straightening of the fiber has ended and the voltage value at the output of converter 9 changed, and therefore, transients in block 12 differentiation can not occur, and the input of the amplifier 13 will be served IP = 0.

Next, the pulses arrive at the amplifier 13 and the Schmitt trigger 14. When the extension increases, the signals arriving at the Schmitt trigger 14, which ceases to generate the signal, “From the Schmitt trigger 14, the pulses arrive at the driver 15 along the front, which expands (in time) the pulse to

12 ms Then the pulses arrive at element 16, which implements the function y = x, x ₂ . The same element 16 receives pulses from a pulse sensor.

1183898

18 positions of the rotor of the drive (is the synchronizer of the breaker operation) through the shaper 17 (in decay) with с = 0.2 ms. As a result, pulses that are a function of the extension increment y = x, x ₂ , prohibit the passage of pulses to the output of element 16 in the presence of an extension increment.

When the extension increment stops, the inhibiting pulses from the transducer 9 disappear and the pulses from the shaper 17 pass to the output of the element 16. After the pulses expand from the element 16 to 20 ms, they come through the shaper 19 pulses (along the front), which serves to eliminate possible " the chattering of the contact of the pulse sensor 18 of the rotor position of the drive, to the switching element 20 and further to the relay 21 of the drive stop;

Claims (2)

1. A DEVICE FOR CONTROLLING THE IZVITOSTY OF TEXTILE FIBERS, containing movable and fixed yarn clamps, the movable clamp is mounted for movement by means of a spring and actuator. control of the fiber extension increment, the output of which through the differentiation unit and the amplifier is connected with the trigger input, and the drive control unit, characterized in that, in order to Improving the accuracy of control, it is equipped with a pulse position sensor rotor drive, a prohibition logic element and pulse shapers, and the trigger is made in the form of a Schmitt trigger, and the Schmitt trigger output through the first pulse shaper is connected to the prohibitory input of the prohibition logic element, which information input through the second driver pulses are connected to the output of the pulse position sensor of the rotor of the drive, and the output of the inhibit logic element through the third pulse shaper is connected to the input Lok drive control, the drive pulse of the rotor position sensor output is connected to the clock input fiber elongation increment control unit. 2. The device according to claim 1, characterized in that the drive is made linear, and the spring is tensioned, while the drive rotor and the axis of the spring are coaxially mounted. eo with thirty eo 1 1183898 2