SU1626154A1 - Device for testing fabric density irregularity - Google Patents

Abstract

The invention relates to the textile industry. The purpose of the invention is to expand the technological capabilities by determining the unevenness of the fabric by the density of the weft yarns. The device has a set of sensors (photoelectric) for the presence of weft threads placed across the width of the controlled fabric. Each of the sensors is associated with a counter recording the number of weft threads in the fabric at a certain length thereof. After the fabric has passed a predetermined length, the counters are compared. The measure of unevenness in the density of the weft yarns of a fabric is the difference in meter readings. 1 hp f-ly, 1 ill.

Description

The invention relates to the textile industry.

The purpose of the invention is the expansion of technological capabilities by determining the unevenness of the fabric by the density of the weft yarns.

The drawing shows the block diagram of the device.

The device contains a meter (sensor) 1 position of weft threads (DN), a sensor 2 fabric length (DDT), a block of 3 photo amplifiers (BFU) and an electronic circuit 4 blocks counting the number of threads and the fabric length (ESKN and

DLV device sensor 1 contains a set

mounted at a certain distance from each other, photocells 5-7 mounted in a housing that is equipped with an optical system (not shown). The fabric 8 is located in the measurements between the illuminator 9 and the body with photocells.

Sensor 2 contains a measuring roller (not nt cauldron) with a photoelectric conversion. the hotel moving it into an electrical signal. Two control screen disks 10 and 11 have holes. The discs are kinematically associated with the gauge roller. The photoelectric converter contains two sources 12 and 13 of light and two photocells 14 and 15. At the same time, disk 11 is freely placed on the same axis as disk 10. When adjusting, one screen disk is relative to another disk fixed on axis 16 or on the hub of a measuring roll, can shift by a certain angle and fix in a new position (occupies a fixed position) The axis 16 of the measuring roller is kinematically connected with the generator of 17 pulses, made, for example, in the form of a Hall generator

In the electronic circuit 4 of the counting unit of the number of threads and the length of the fabric, there are shapers 18 and 19 pulses, trigger 20, four logical elements AND-NOT 21-24, for

WITH

oh oh

ate

four

sensor 25 of controlled length of fabric, counter 26 of fabric length, logic element E27, amplifier shaper 28, divider 29 pulse frequency, unit 30 of the pulse frequency division factor, counter 31 (three-channel) and block 32, for example, a computer, calculating weft fabric unevenness threads.

The outputs of the photocells 14 and 15 through the formers 18 and 19 are connected to the mutually inverted inputs of the trigger 20, the outputs of which are connected respectively to the elements AND-NE 21-24 and the logic element AND 27, and another input of the element AND-NOT 21 is connected to the setting unit 25, and output - with a counter 26 controlled length of the fabric. In turn, the second input element AND 27 is connected to the amplifier-driver 28 of the generator 17 (Hall generator), and its output is connected to a frequency divider 29, the other input of which is connected to the divider of the division factor 30. At the same time, the outputs of the AND-22 elements -24 are connected to a three-channel counter 31 for counting the number of filaments, and their second inputs through the amplifiers of block 3 are connected to photocells 5-7.

Information taken from counters 26 and 31, as well as from the divider 29 of the quantization step frequency over the base length of the measured piece of fabric, is fed for further processing to the block 32 for calculating the unevenness of the fabric by the density of the weft threads.

The quantization step along the length of the measured sections and the total measurement interval are determined by the setting relative to the position of the cloth length sensor disks and the tuning to the interval division of the frequency divider 29, as well as by the setting unit 25. which sets the total length of the monitored implementation.

It should be noted that the master of 25 meters is designed, for example, in the form of a coincidence circuit switched with keys located on the dial field and controlled by a manual switch (not shown). In turn, the setting unit 30 of the division factor and the divider 29 are made, for example, according to the counter scheme with a variable conversion factor.

The device works as follows.

When the measuring roller is rotated and the signal from the photocell 14 is energized, the trigger 20 is put into a working state. In this case, the pulses from the output of photocells 5-7 pass through the block 3 photo amplifiers and the elements AND-NOT 22-24 to the inputs of the counter 31 of the counting and averaging number of filaments. With the arrival of the signal from the imaging unit 19 on the trigger 20, the counting of pulses from the generator 17 simultaneously starts. Both signals go to the logic element I 27 and, if there is

both of the outputs of the two signals at the output of the element And 27 appear pulses, the next with the frequency of the signals of the generator 17. The pulses coming from the output of the element And 27 to the dividers 29 are formed in

0 a burst of pulses, the filling of which is set by the setting unit 30 of the division factor.

When a pulse from the photocell 15 appears, trigger 20 is set to its original

5, the non-operating state and counting of the threads is stopped for the period of the passage of the compensating length adjusted at the working length of the metering roller. After this, the signal from the photocell 14 transfers the trigger 20 from the state 1 to O, and a pulse passes through the AND-NE element 21, which is detected by the counter 26 of the length of the measured tissue segment. For one revolution of the measuring roller in the counter 31, it fixes5 with the number of pulses equal to the number of threads on each of its three channels on the controlled length of the fabric. At the next turn of the measuring roller, the measurement process is repeated. During the period

From the arrival of signals from the photocells 14 and 15, the base section of the tissue section is measured. Frequency counting period divider 29 can additionally be divided into any received

5 interval with a corresponding division of the counted number of threads. The coefficient determining the counting period of the threads is dialed on the scale of the setting device 30 and its value is equivalent for operation across all three channels of the counter 31. By dialing the required period period divider, the quantization step size is changed along the implementation length and provides a wide range of variation for identifying the characteristic parameters of density unevenness of weft threads along the length of the product under study. For example, if the length of the base segment is 50 cm and the value of the divider of the counting period of the thread is ten, the step

0 quantization is 5.0 cm, and with a period divider of 50, the quantization step is 1.0 cm. The quantization step is accumulated and induced, for example, on an electronic display board of a device for determining the structural unevenness of woven products. The total length of the implementation is set using the setting device 25 and after measuring it is induced on the electronic display board. As soon as a number proportional to a given controlled length is fixed in the fabric length counter 26 (this number is set using setpoint 25), the output of setpoint 25 is followed by a signal blocking element IS-NE 21 and the measurement process is terminated.

Thus, with the help of the device, the average density values of the weft threads of the moving fabric on the basic controlled area of the fabric are provided with the possibility of quick changeover and recalculation to differently set quantization step length. The whole mathematical calculation of the measurement results for the specified algorithms is performed in computer unit 32 unevenness of fabric according to the density of weft threads.

Claims (1)

Claim 1. Device for monitoring unevenness in tissue density, containing a measuring roller with a photoelectric transducer of its movement into an electrical signal, the outputs of which through a trigger are connected to the first input of the first NAND element, the output of which through a fabric length counter is connected to the input of the length adjuster tissue, the output connected to the second input of the first element AND-NOT, the meter position of the weft threads, the second element AND-NOT and the block count weft threads, characterized in that, with the aim of expanding the technological x features, it is equipped with additional AND-NOT elements, AND element, kinematically connected to the axis of the measuring roller with a pulse generator, a pulse frequency divider and a unit for calculating the unevenness of the fabric according to the density of the weft threads; inputs of the second and additional elements of the NAND, respectively, the second inputs of the trigger connected to the output, and the outputs connected to the corresponding inputs of the counting block of the weft threads, the outputs of the pulse generator and the trigger Erez AND gate coupled to an information input of the frequency divider 0 pulses, and the outputs of the fabric length counter, the pulse frequency divider and the counting block of the weft threads are connected to the corresponding inputs of the unit for calculating the unevenness of the fabric by the density of the weft threads. 52. Device pop. 1, characterized in that it is equipped with a unit for the division of the frequency of pulses, an output connected to the control input of a pulse frequency divider. 0