Method for detecting seam of textile material processed in form of tow

FIELD: textiles, paper.

SUBSTANCE: invention relates to textile industry and can be used in control systems of transporting the textile material during technological processing in the form of a tow. The method of detecting a seam of the textile material processed in the form of a tow comprises placing the movable textile material inside the induced coil of the oscillating circuit, amplification and detection of the high frequency voltage at the output of the generator and forming while reducing voltage at the output of the amplifier-detector of the pulse of required duration for safe operation of the actuator. And the seam of the textile material is provided with a conductive label, the amplitude of high frequency voltage is set from the conditions of the required sensitivity at the output of the generator, the voltage is converted at the output of the amplifier-detector and it is compared with the driving voltage, and the resulting difference of voltage is integrated, and the voltage is applied at the output of the integrator to stabilise the amplitude of high frequency voltage at the output of the generator, and the integration process is interrupted for the period of the formed impulse action. The conductive label is used, for example, as a metallised thread, which is used for sewing the textile material pieces in the continuous web.

EFFECT: increase in reliability of detection of the seam of textile material processed in the form of a tow and providing automatic compensation of external disturbing effects.

2 cl, 1 dwg

 

The invention relates to the textile industry and can be used in control systems for the conveyance of the textile material in the process of technological processing in the form of a plait.

Known "Method of detection of metal objects in the tissues" (Copyright certificate of the USSR No. 97710, IPC D06H 3/14, 1954), which consists in generating high frequency oscillations in the resonant circuit, the placement of relocatable textile material inside the coil inductance of the oscillatory circuit, the amplification and detection of high-frequency voltage generator output and the formation when the voltage at the output of the amplifier-detector of a pulse of the required duration for reliable actuation of the actuating mechanism.

The disadvantage of this method is its low reliability and noise immunity environmental uncertainty and parametric perturbations.

The technical result of the proposed method is to increase the reliability of detection of the seam to be processed in the form of a bundle of textile material and in providing automatic compensation for external disturbances.

The technical result is achieved in that in the method of detecting seam processed in the form of a bundle of textile material comprising generating vysokochastotnymi in the resonant circuit, placement roaming textile material inside the coil inductance resonant circuit, the amplification and detection of high-frequency voltage generator output and the formation when the voltage at the output of the amplifier-detector of a pulse of the required duration for reliable actuation of the actuating mechanism, ensure the seam is electrically conductive textile material label, set of conditions required sensitivity of the amplitude of the high frequency voltage output of the generator, converts the voltage output from the amplifier-detector and compare it with the reference voltage and the obtained voltage difference integrates and applies the output voltage of the integrator for the stabilization of the amplitude of the RF voltage at the generator output, and the process of integration is interrupted for the duration of the generated pulse.

As the conductive label is used, for example, metallic thread, which is sewn together pieces of fabric into a continuous sheet.

The drawing shows a block diagram of a device that implements the proposed method of detection of the seam to be processed in the form of a bundle of textile material.

This device has connected in series a high-frequency generator 1 with an oscillatory circuit comprising �atusko inductance 2 and the container 3, the amplifier-detector 4, the pulse shaper 5 and the actuator 6.

To the input of a high frequency generator 1 is connected to the output of the first comparison unit 7, to the respective inputs of which are connected to the output of master unit 8 and the output of the integrator 9.

To respective inputs of the second comparison unit 10 is connected to the output of master unit 8 and the output of the voltage Converter 11, the input of which is connected to the output of the amplifier-detector 4, and the output of the second comparison unit 10 is connected to the first input key 12, to the second input of which is through the logical element "NOT" 13 is connected to the output of the pulse shaper 5. The output of the key 12 is connected with the input of the integrator 9.

The method is as follows.

The seam of the textile material 14 when it is processed in the wiring cannot be detected with traditional contact method on the background of natural thickening (folds) of the loom textile material 14. Therefore, the seam of the textile material 14 can be performed, for example, metallic threads or be provided with a conductive label 15.

With the passage applied to the conductive seam marks 15 through the coil 2 decreases the amplitude of the voltage at the output of the high frequency generator 1 is therefore reduced and the DC component of the output voltage of the amplifier-detector 4, with the achievement�AI which threshold value the pulse shaper 5 generates a pulse, the duration of which is determined by the conditions of reliable inertial actuation of the actuating mechanism 6.

In the initial state, the amplitude of the voltage at the output of the high frequency generator 1 is installed in accordance with the voltage of the job output setting unit 8 for the purpose of reliable detection of specific conductive marks 15 (or of metallized yarn) is applied to the seam of the textile material 14.

When you change the amplitude of the output voltage of the HF generator 1 under the action of external conditions and/or parametric perturbations varies as the voltage at the output of the amplifier-detector 4 and the output voltage of the voltage Converter 11, which provides the amplification and suppression of the variable component of the input signal.

The voltage difference at the outputs of the master unit 8 and the voltage Converter 11 through the switch 12, the supported logical element "NOT" 13 in the open state, is fed to the input of the integrator 9, which provides a static correction of the amplitude of the output voltage of the high-frequency generator 1 and its stabilization at a given level.

For example, when reducing the amplitude of the voltage at the output of the high frequency generator 1 and, as a consequence, when the voltage at the output of the voltage Converter 11 relative to the voltage specified�I output driver unit 8, the voltage at the output of the integrator 9 will be summed with the voltage of the job to fully restore the original settings. In other words, there will be compensation of disturbing external and/or parametric perturbations that affect the amplitude of the output voltage of the HF generator 1.

By analogy with the amplitude of the voltage at the output of the high-frequency generator 1, the voltage at the output of the integrator 9 will be deducted from the stress of the job, which will lead to a decrease in the amplitude of the voltage at the output of the high frequency generator 1 to the specified value.

At the time of detection of conductive marks 15 logical element "NOT" 13 receives the pulse output from the pulse shaper 5 and interrupts the integrator 9, excluding false reconfiguration of the generator 1.

Thus, implementation of the proposed method allows to increase the reliability of detection of the seam to be processed in the form of a bundle of textile material and to provide automatic compensation for external disturbances.

1. Method of detecting seam processed in the form of a bundle of textile material comprising the generation of high frequency oscillations in the resonant circuit, the placement of relocatable textile material inside the coil inductance resonant circuit, the amplification and detection of high-frequency voltage generator output and the formation when the voltage at the output of the amplifier-detector they�pulse of the required duration for reliable actuation of the actuating mechanism, characterized in that provide a seam electrically conductive textile material label, set of conditions required sensitivity of the amplitude of the high frequency voltage output of the generator, converts the voltage output from the amplifier-detector and compare it with the reference voltage and the obtained voltage difference integrates and applies the output voltage of the integrator for the stabilization of the amplitude of the RF voltage at the generator output, and the process of integration is interrupted for the duration of the generated pulse.

2. Method of detecting seam processed in the form of a bundle of textile material according to claim 1, characterized in that is used as a conductive metallized label the thread, which is sewn together pieces of fabric into a continuous sheet.



 

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