SU792139A1 - Filament flaw analyzer - Google Patents

Description

I

The invention relates to a control and measuring technique of the textile industry, more specifically to devices for monitoring yarn and yarn defects.

The known thread defect analyzer, containing the thread thickness sensor, through the first input of the voltage converter is the frequency connected to the integrator, the threshold element, through the first input of the thread defects discriminator connected to the thread defects counter, the thread pulling mechanism and the thread meter counter, the output of which connected to the second input of the discriminator of defects along the length of the thread lj.

The main disadvantage of the known device is the low control accuracy, caused by the instability of the speed of the controlled filament pulling.

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

The goal is achieved due to the fact that the analyzer has an attenuator;

The thread and the master oscillator, while the master oscillator output is connected to the first inputs of the thread speed control unit and the thread metric counter, the output of the thread metric meter is electrically connected to the second inputs of the voltage-frequency converter and the variable speed control unit. thread and with the first input of the attenuator, the output of the control unit for moving the thread is connected to the thread pulling mechanism, to the second input of the thread meter and to the first input of the threshold element, and the second input of the threshold element to the second and third the inputs of which are connected respectively to the outputs of the thread thickness sensor and the integrator, where the output of the thread drawing mechanism is connected to the third input of the control unit for the speed of movement of the thread.

Claims (1)

The drawing shows the block of the analyzer chip. 3 The analyzer consists of a yarn thickness sensor 1, a voltage-frequency converter 2, an integrator 3, a controlled attenuator 4, a thread stretch mecanism 5, a threshold element 6, a discriminator 7 thread yarns in length, a thread flaw counter 8, block 9 controlling the speed of movement of the thread, the counter 10 of the footage, the master oscillator 11, the output of the sensor 1 of the thread thickness is connected to the inputs of the controlled attenuator 4 and the converter 2 voltage - frequency, the code of which is connected to the integrator 3, the inputs of the controlled attenuator 4 and the converter2 voltage - the frequency is connected to the output of counter 1O footage, the output of integrator 3 is connected to the input of a controlled attenuator 4, the code of which is connected to the input of threshold element 6, the output of which is connected to the input of the discriminator 7 thread defects, which is connected to the output counter 10 meter, the output of the discriminator 7 thread defects along the length Connected to the input of the counter 8 defects, the input of the counter 1O footage connected to the input of the threshold element 6 and the output of the unit 9 controlling the speed of the thread, which input is connected to the output mech An anism 5 of the thread, the input of which is connected to the output of the thread speed control unit 9, the input of which is connected to the output of the lO meter counter, the input of which is connected to the output of the master oscillator 11 and the input of the thread speed control unit 9. The analyzer works as follows. The process of measuring thread flaws consists of two cycles. In the first cycle, the average value of the thickness of the filament in a given segment is measured. In the second cycle, the number of flaws (thickenings and thinning) in the next segment of the thread is calculated relative to the average value of the previous segment. In the first cycle, the device operates as follows. The controlled thread with the help of the mechanism 5 of the thread moves through the sensor 1 of the thickness of the thread. The signal from the sensor, which characterizes the current thickness loss of the yarn, is fed to voltage converter 2 — frequencies that convert the analog signal to variable frequency pulses, which are fixed by integrator 3. The content of integrator 3 (counter) increases until 10 meters from the meter. voltage does not arrive at the voltage converter 2 — a prohibiting impulse will not go on, fixing the moment when a specified number of tonnes of filament yarn passes through the thread thickness sensor 1. This ends the first cycle. The signal from the meter counter 10, characterizing the passage through the sensor 1 of the thickness of the thread of a given number of meters, also goes to the controlled attenuator 4, allowing the signal from the sensor 1 of the thickness of the thread to pass through it. This signal starts the second cycle of the device. From the integrator 3, the controlled attenuator 4 receives the code of the number characterizing the average thickness of the monitored thread. In the controlled attenuator 4, the current thickness of the filament from the sensor 1 of the thread thickness is divided by the average thickness from the integrator 3, the normalized signal from the controlled Attenuator 4 is fed to threshold element 6, where it is discriminated by amplitude. From threshold element 6, the signal is fed to the discriminator 7 thread defects along the length. From discriminator 7 the signal goes to counter 8 defects; in which the number of defects of a controlled amplitude and length on a given piece of thread is calculated. Pulses are taken from the sensor of rotational speed of the rotor of the electric motor of the thread pulling mechanism 5, which are fed to the thread speed control unit 9. When the rotor frequency of the electric motor is turned off from the frequency of the master oscillator 11, block 9 generates a signal that stops meter counting in the meter unit and prohibits the signal from the controlled attenuator 4 through the threshold element 6 until the rotation frequency is equal to the specified one. From block 9, a control signal is also output to the motor core winding. The meter counter 10 counts the pulses from the master oscillator 11, which characterize length segments. After the end of the second cycle, the meter counter 10 issues a signal to the thread speed control unit 9, through which a signal is received from the stop of the electric motor of the pulling mechanism 5. 5 The claims of the thread blemish analyzer containing the thread thickness gauge through the first input of the voltage converter - frequency connected with the integrators, the threshold element, connected to the thread blemish counter, the thread pulling mechanism and the thread metric meter, output through the first thread bleed discriminator. which is connected to the second input of the discriminator of defects along the length of the thread, characterized in that, in order to increase the accuracy of the control, it has an attenuator, a control unit for the speed of movement of the thread and a master generator, In this case, the output of the master oscillator is connected to the first inputs of the thread speed control unit and the thread meter counter, the output of the thread meter counter 96 is electrically connected to the second inputs of the voltage – frequency converter and the thread speed control unit and the first input of the attenuator, the speed control unit output the thread is connected to the thread pulling mechanism, to the second input of the thread meter counter and to the first input of the threshold element, and the second input of the threshold element is connected with the attenuator output, second second and third inputs connected respectively to the yarn thickness of the sensor output and the integrator, the output mechanism of transport of the yarn is bonded to the third input of the speed control block movement of the yarn. Sources of information taken into account with the expert 1. US patent N 3887814, cl. 250 - 562, 1975 (prototype).