SU1647252A1 - Device for instantaneously measuring fibrous material diameter - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to increase accuracy, information content and reliability by reducing the error from fluctuations by obtaining information in a pulse-digital form, obtaining an average diameter and eliminating mechanical transmissions. The device has a line of LEDs and a pulse distributor, which controls the line when the signals from the generator are applied, which allows using the logic circuit of signal processing to obtain the necessary parameters in digital form. 1 hp ff, 1 ill.

Description

The invention relates to a measurement technique and can be used in light industry to determine the linear magnitude of the projection of the instantaneous diameter of fibrous materials in various technological processes without stopping equipment, for example in the textile industry.

The aim of the invention is to improve the accuracy, information content and reliability by reducing the error from fluctuations by obtaining information in a pulse-digital form, obtaining an average diameter value and eliminating mechanical transmissions.

The drawing shows a block diagram of the device.

The device contains a generator of 1 pulses, a distributor of 2 pulses, an illuminator in the form of a line of 3 LEDs, four RS-flip-flops 4, 5, 6, 7, four I-NE elements 8, 9, 10, 11, three groups of decimal

counters 12,13,14, two elements NOT 15.16, two elements AND 17,18 and a series-connected photodetector 19, an amplifier 20, a driver of 21 pulses. The output of the trigger 4 is connected to the first inputs of the elements AND-NOT 8.9, the second inputs of which are connected respectively to the output of the element And 17 connected to the counting input of the counter 13, and to the output of the trigger 5. The third input of the element AND-NOT 9 is connected to the output of the ram 21 pulses connected to the first input of the element 18 and the input of the element 16, the output of which is connected to the S-input of the trigger 4 and the input of the element 17. The other input of the element 17 is combined with the counting input of the distributor 2 pulses, the counter 12 and the output of the generator 1 pulses. The outputs of the elements AND-NOT 8.9 are connected to the S-inputs of the flip-flops 5 and 6, respectively. The direct output of the flip-flop 6 is connected to the counting input of the counter 14, and the inverse is connected to the first input of the elementfe

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That AND-NOT 10, the second input of which is through the element NOT 15 is connected to the transfer output of the counter 14. The transfer output of the counter 12 is connected to the second input of the element AND 18, the output of which is connected to the first input of the element AND-NOT 11, the second input of which is combined with the output the element AND-NOT 10 and the S-input of the trigger 7. The output of the element-NE 11 is connected to the R-input of the trigger 7, the direct output of which is connected to the R-inputs of the triggers 4,5,6 and the stop input of the pulse generator 1, and the inverse - with inputs of zeroing the distributor 2 pulses and the counter 12. The outputs of the distributor 2 IMPULE OM connected in series with similar line 3 inputs LED oriented perpendicular to the movement of the fibrous material 22 This line 3 LEDs and the photodetector 19 are located on opposite sides of the material movement plane and in front of the photodetector 19 is the lens 23, the photodetector 19 is in a rear focus lens 23.

Fixing the start of measurements is provided in the device by introducing the zero setting button 24, when pressed, the inverse output of trigger 7 is connected to the zeroing inputs of counters 13 and 14. Switch 25 converts the device from measuring the average diameter to measuring its instantaneous value after pressing button 24.

A device for measuring the diameter of fibrous materials works as follows.

The switched on device with the aid of the button 24 is brought to the initial state, at which the counters 12, 13, 14 and the distributor 2 of the pulses are zeroed. Distributor 2 addresses the pulses of the generator 1 to the inputs of a line of 3 LEDs, starting with the first number. When this occurs alternate radiation of LEDs. These light pulses of the lens 23 are focused on the photodetector 19, the signals from which are amplified by the amplifier 20 and normalized by the shaper 21. Thus, the standardized signal is fed to the inverting element HE 16 and then to one input of the element 17. 17. The other input receives a pulse from the generator 1 stimulated radiation. When the pulses coincide at the input of the element And 17, a logical signal O is generated, which does not increase the content of the counter 13 by one. The situation is different when the fibrous material 22 overlaps part of the LEDs. As a result, a negative polarity pulse does not appear at the output of the element 16 in tact with the generator, which results in the output of the element 17 of the signal logical 1 for each pulse of the generator 1, while the LEDs of the ruler 3, covered with a fiber, appear material 22. These pulses, carrying information about the instantaneous diameter of the fibrous product, are recorded by the counter 13.

0 At the same time, the very first negative pulse of the output of the element HE 16 triggers the trigger 4 into a single state when a high level of voltage is established at its forward output. From to left

5, the first impulse at the output of the element AND 17 at the output of the element IS-HE 8 forms a pulse of negative polchrngst, which translates the trigger 5 also into a single state.

0 After measuring the instantaneous diameter, the first pulse from the imaging unit 21 triggers a negative pulse at the output of the NAND 9 element, which translates the trigger L into a single state. As a result, the element AND-NE 10 at the input from trigger 6 receives a low potential (0-state) and at its output sets a high potential (single state). The 100th pulse of generator 1 causes the appearance of a pulse at the transfer output of the counter 12 and at the output of the former 21 simultaneously. This leads to the fact that at the output of the element And 18 a pulse of positive polarity is formed, and at the output

5 elements AND-NOT 11 - impulse of negative polarity. The latter sets the trigger 7 to the initial state when its potential is low at its direct output. In this case, the generator 1 is turned off and the flip-flops 4, 5, 6 return to the initial state. As a result, a pulse is generated at the output of the flip-flop 6, which increases the content of the counter 14 per unit. When the flip-flop 7 goes

5, the initial state, the differential voltage at its inverse output, zeroes the counter 12 and the distributor 2 pulses. The transition of the trigger 6 to the initial state leads to the restoration of a high potential at the corresponding input of the NAND element 10, which forms a negative voltage drop at its output and, as a result, the trigger 7 is transferred again to the single state. With

5 this starts the generator 1 and starts the next measurement cycle. Such cyclical operation continues until the counter 14 is filled. Then the high potential is formed at the transfer output of the counter 14, and the element

NOT 15 - low. As a result, a high (single) potential will be detected at the output of the NAND 10 element. The trigger 7 remains in its initial state, the generator 1 is blocked, and the measurement process is terminated. According to the information taken from the digital indicators associated with the counters 13 and 14, the average thread diameter (yarn) is calculated. If further averaging measurements are necessary, the device is switched to the working state by pressing the button 24.

The device measures the instantaneous diameter when the switch 25 is set to an open circuit state, when the transition of the trigger 7 to the initial state does not lead to the initialization of the triggers 4,5,6. In this case, the digital indication from the counter 13 carries information about the instantaneous value of the thread diameter (). The next measurement of the instantaneous diameter is made after pressing the button 24.

Claims (2)

1. An apparatus for measuring the instantaneous diameter of fibrous materials, comprising an illuminator and a photodetector located on different sides of the plane of movement of the material, and a scanning unit, characterized in that, in order to increase accuracy, informativeness and reliability by reducing errors from fluctuations by obtaining information signal in the pulse-digital representation and obtaining the average value of the diameter and exclusion of mechanical transmissions; three groups of decimal counters were introduced into it, four RS-triggers oh, the four elements are NOT, the element is NOT, two elements are AND connected in series to the amplifier, pulse shaper, and the second element is NOT, while the illuminator is made in the form of a line of LEDs installed perpendicular to the direction of movement of the fibrous material, the scanning unit is made generator and a pulse distributor, whose outputs are connected in series with the like inputs of the LED array, the output of the photodetector connected to the amplifier, the output of the pulse generator is connected to the counting inputs of the decimal counter of the first group and the pulse distributor and to the input of the first element I, the second input of which is combined with the output The second element is NOT and with the S-input of the first RS-flip-flop, the output connected to the first inputs of the first and second elements AND-NOT, the second inputs of which are respectively connected to the output of the first A of the element I, combined with the counting input of the decimal counter of the second group, and with the output of the second RS flip-flop, whose S input is connected to the output of the first AND-NO element, the third input of the second I-NOT element is combined with the output of the pulse former and the first input The second element is And, and the output is connected to the S-input of the third RS-flip-flop, the direct and inverse outputs of which are connected respectively to the counting input of the decimal counter of the third group and the first input of the third NAND element, the transfer outputs of the counters of the first and third groups These elements are respectively to the second inputs of the second element AND through the first element of the NOT element of the third NAND, while the output of the second element AND is connected to the first input of the fourth element NAND, and the output of the third element IS NOT the connected to the S input of the fourth RS- trigger and the second input of the fourth element IS-NOT, the output connected to the R-input of the fourth RS-flip-flop, mutually inverted outputs of which are respectively connected to the stop input of the pulse generator, R-inputs of the first, second, third RS-flip-flops and inputs of zero zero tichny Meters withstand the first group and the distribution divider pulses. 2. The device pop. 1, characterized in that it is equipped with a lens placed in front of the photodetector, located in its back focus. z: P tfffl one 12 L w „I Jtfl li.J .