SU1481283A1 - Apparatus for monitoring the presence of thread - Google Patents

Abstract

The invention relates to control means and can be used on textile machines. The purpose of the invention is to improve the accuracy of control. The device consists of an optocoupler sensor, which includes a light source 1, associated with the electronic key 3, and a photodetector 5, connected to a resistor matrix 7 and a threshold element 14. At the input of the counter 12, output signals are received from the output processing unit 13 photodetector 5. In the period of operation of the device, periodic sensitivity checks are performed by reducing the luminous flux by turning off the electronic key 3, and a short light pulse is generated, mmitiruyuschy the occurrence of the yarn in the control zone. Based on the test results, the gain of the photodetector is adjusted to 5. 5. Il.

Description

(21) 4256284 / 28-12

(22) 06/02/87

(46) 05.23.89. Bul No. 19

(71) All-Union Scientific Research Institute of Light and Textile Engineering

(72) A.K. Kurilin and V.'. Ivanov

(53) 658.652 (088.8)

(56) USSR Author's Certificate & 1208103, CP. D 01 H 13/16, 1984.

(54) DEVICE FOR CONTROL OF AVAILABILITY OF THREAD

(57) The invention relates to control means and can be used on textile machines. The 11th invention of increased control accuracy. The device consists of an optocoupler sensor, including a light source 1, associated with an electronic key 3, and a photodetector 5, connected to a resistor matrix 7 and a threshold element 14. At the input of the counter 12, output signals are received from the output of the information processing unit 13. photodetector 5. In the period of operation of the device, a periodic sensitivity check is performed by reducing the luminous flux by turning off the electronic key 3, and a short light pulse is generated ls simulating the appearance of the yarn in the control zone. Based on the results of the test, the gain of the photodetector is adjusted to 5. 5. Il.

with

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The invention relates to control means and can be used on textile machines.

The purpose of the invention is to improve the accuracy of control.

The drawing shows a block diagram of the device.

The device contains an optocoupler for the presence of a filament consisting of a source of light 1 associated with a resistor 2 and an electronic switch 3 through a resistor 4, and a photodetector 5 connected to a source 10

At the moment, all bits of the counter 12 have a low potential, while the electronic key 3 is closed, and the electronic keys 8-11 are open. The voltage coming from the photodetector 5 to the input of the threshold element 14 exceeds the threshold and its output has a high potential.

When pulses are received from the information processing unit 13 at the input of the counter 12, the electronic switches are closed in such a way that the total resistor load, the connected

a power supply (not shown) through a resistor, resistor 6, increases to those

torus 6. Photodetector 5 is connected to the input of the resistor matrix 7. The control inputs of the electronic switches 8-11 are connected to the corresponding outputs of the counter 12. The information processing unit 13 of the outputs is connected to the inputs of the counter 12 and the electronic switch 3, Threshold the input element 14 is connected to the resistor 6, and the output to the inputs of the information processing unit 13 and the logic element 15, the output of which is connected to an indicator (not shown). i

The other input of the logic element 15 is connected with the output of the information processing unit 13. The resistor matrix 7 is made in the form of a chain of series-connected resistors 16 and output resistors 17, each of which is connected to the output of the corresponding electronic key 8-11.

The device works as follows.

The luminous flux generated by the source of a light pulse that simulates

the appearance of the thread in the control zone. If an output pulse occurs at the output of the threshold element 14 at this time point, the gain of the photocopier 5 remains unchanged. In the opposite case, the gain is adjusted by applying pulses to the input of the counter 12. When checking the sensitivity and also during its adjustment, the output of the threshold element 14 is blocked by the input to the input of the logic element 15 of the inhibit signal from the processing unit 13 information.

Nkkom light emission 1 and received by the photodetector 5, affects the current flowing in the circuit of the photodetector 5, and accordingly the voltage falling on the resistor 6. In the initial 5 state, the gain of the photoreceiver 5 is minimal and is determined by the value of the resistor 6 and divider, consisting of a resistor 6 and a resistance determined by a resistor matrix 7. The inputs of the information processing unit 13 are fed to the input of the counter 12c, which are used to increase the gain of the photodetector 5 by sequencing The change in resistance (increase) in its output circuit.

The increase in resistance is as follows. To the beginning

At the moment, all bits of the counter 12 have a low potential, while the electronic key 3 is closed, and the electronic keys 8-11 are open. The voltage coming from the photodetector 5 to the input of the threshold element 14 exceeds the threshold and its output has a high potential.

When pulses are received from the information processing unit 13 at the input of the counter 12, the electronic switches are closed in such a way that the total resistor load, the connected

then until the input voltage of the threshold element 14 becomes less than ip, i.e. increase in load resistance of the photodetector 5

with as long as

is produced until the constant voltage taken from the output of the photoreceiver 5 reaches the threshold of the threshold element 14, which is fixed by the information processing unit 13, resulting in fixation of the load resistance and, therefore, the gain of the photoreceiver 5. Sensitivity of the photoreceiver 5 at the same time becomes maximum and the circuit goes into standby mode (control).

During the operation of the device, periodic sensitivity checks are performed by reducing the luminous flux. The reduction of the light flux is accomplished by turning off the electronic switch 3 and thereby reducing the current in the circuit of the light source 1. This generates a short light pulse imitating

the appearance of the thread in the control zone. If a pulse occurs at the output of the threshold element 14 at this point in time, the gain of the photodetector 5 remains unchanged. Otherwise, the gain is adjusted by applying pulses to the input of the counter 12. When checking the sensitivity, as well as during its adjustment, the output of the threshold element 14 is blocked by applying an inhibitory signal from the information processing unit 13 to the input of the logic element 15.

Claims (1)

Claims of the device The control of the presence of a filament containing an optocoupler of the presence of a filament, a threshold element, an information processing unit and a logic element I, output connected with an indicator, characterized in that it is equipped with a counter, electronic keys and a resistor matrix made in the form of a chain of series-connected resistors and output resistors, each of which is connected to the common point of the corresponding two series-connected chain resistors by the first terminal, the output of the light source of the optical sensor of the presence of the thread is connected to the output of the first electronic key, the control input of which is connected to the first output of the information processing unit, and the photodetector of the optical sensor of the presence of the thread is connected to the first input of the threshold element and the first output of the resistor matrix, the second output of which is connected to the common bus, and the second terminals of the output resistors of the resistor matrix are connected to the outputs of the corresponding electronic switches, starting with the second, while the output of the threshold element is associated with the input of the information processing unit and the first input of the logic element And, the second input of which is connected to the second output the information processing unit, the third output associated with the input of the counter, the outputs of which are connected to the corresponding control inputs of the electronic keys, starting with the second.