Device for monitoring of fabric feed availability at textile machine inlet

FIELD: textile industry.

SUBSTANCE: device for monitoring of fabric feed availability at textile machine inlet comprises capacitance sensors, self-contained generators, mixer, narrowband resonant amplifier, detector, low-pass filter, DC amplifier, count trigger, high-frequency amplifier, frequency detector, comparator, amplifier of control signals, high-frequency amplifier, frequency detector, comparator and control signal amplifier. Inlet of high-frequency amplifier is connected to outlet of one of self-contained generators, and outlet of high-frequency amplifier is connected to inlet of frequency detector, outlet of which is connected to inlet of comparator, which is connected to inlet of control signal amplifier.

EFFECT: device provides for control of fabric feed continuity at machine inlet, automatic shutdown of machine in case fabric feed is interrupted and actuation of control alarm.

2 dwg

 

The invention relates to control the continuity of the technological process of processing the tissue for multiple, for example, strygalnya finishing machines textile industry.

The violation of the continuity of the process is called the cut tissue at the entrance of the machine as the result of delays in receipt of another party for processing, delays in the connection of the canvas next piece of fabric with the fabric of the preceding piece of cloth tucked into the machine, no machine operator, maintenance at the end of the feed fabric similar machine. In the result of the delay in joining the next piece of fabric inside the machine the fabric through the loop, comes fully at its output, and the machine continues to run at idle. To resume loop fabric you want to re-fill the machine with a cloth that is associated with an additional cost of working time.

A device that controls the fabric during processing strigolniki machine according to U.S. Pat. 2186892, Russian Federation, D06 13/02. Device for the detection of the seam fabric and definitions of unacceptable bias. / Rastorguev, A., Petrov A.V.; applicant and patentee - Ivanovo state textile Academy. No. 2000111600/12; Appl. 10.05.2000; publ. 10.08.2002, bull. No. 22. However, this device is creation, contains conditioners pulses, the trigger elements OR, AND, and gauge the amount of fabric does not respond to the presence of refills tissue at the entrance of the machine.

For the prototype accepted device for the detection of the seam fabric and define the width of the skew containing capacitive sensors, oscillators, mixers, resonant amplifier with a narrow bandwidth, detector, low pass filter, a DC amplifier, a counting trigger (U.S. Pat. 2181806, Russian Federation, D06 13/02. Device for the detection of the seam fabric and define the width of the warp. / Petrov A.V., Rastorguev, A.; applicant and patentee - Ivanovo state textile Academy. No. 2000122824/12; Appl. 01.09.2000; publ. 27.04.2002, bull. No. 12).

The shortcoming of the above device is that the sensors detect the seam of the fabric used in the device does not react to the presence of refills fabric at the entrance of the machine, which eliminates the possibility of preventing full release fabric from the machine, and as a result requires refilling machine, followed by the launch.

These prototype disadvantages limit its scope and cause loss of working time and reduce the efficiency of the machine.

The technical result of the invention are to provide continuity control the feed of the fabric on the od of the machine; automatic stopping of the machine at the termination of its filing, and including a control signaling.

This technical result is achieved in that the control device having a filling of tissue at the entrance of the textile machine that contains the capacitive sensing oscillator, a mixer, a resonant amplifier with a narrow bandwidth, detector, low pass filter, a DC amplifier and a counting trigger, according to the invention in the device additionally introduced a high-frequency amplifier, a frequency detector, a comparator and an amplifier control signal, and the input high-frequency amplifier connected to the output of one oscillator, and the output of high frequency amplifier connected to the input of the frequency detector, the output of which is connected to the input of the comparator is connected to the input of the amplifier control signal.

Figure 1 presents the block diagram of the inventive device. Figure 2-detection feature.

The ability to determine whether the tissue at the entrance of the machine is achieved for the following reasons: when the output of the tissue from the working area of the capacitive sensor, its capacity decreases in ε, where ε is the dielectric constant of the tissue, and the oscillation frequency of the oscillator increasestime. As a result, the sign of the voltage at the output of the frequency detector is changed n the opposite (see 2).

The graph indicated: ƒTCthe oscillation frequency of the oscillator in the presence of tissue in the working zone of the capacitive sensor; ƒBTKTC·the oscillation frequency of the oscillator when the output of the tissue from the working area of the sensor; ƒ0the frequency of the frequency detector; UTCthe voltage at the output of the frequency detector in the presence of tissue in the sensor; UBTKthe voltage at the output of the frequency detector in the absence of tissue in the sensor.

The output signal of the frequency detector to the input of the comparator is triggered only if a signal of a certain level, thus ensuring protection from false alarms due to random fluctuations in the oscillator frequency.

The output signal from the comparator is fed to the amplifier, the output of which the signal is sent to the control unit stopping the machine and on the signal indicating the termination of supply of tissue at the entrance of the machine and it stopped.

The device comprises capacitive sensors 1 and 2, the oscillators 3 and 4, a mixer 5, a resonant narrow-band amplifier 6, a detector 7, the low pass filter 8, a DC amplifier 9, and the audit trigger 10, a high-frequency amplifier 11, a frequency detector 12, a comparator 13, the amplifier control signal 14.

Capacitive sensors 1 and 2 are connected with autogenerate the Rami 3 and 4, the outputs are connected to the input of the mixer 5, which is a resonant narrow-band amplifier 6 is connected to the detector 7, the output of which is connected to the input of the lowpass filter 8 connected to the DC amplifier 9. The output of the DC amplifier is connected to the counting input of the trigger 10, connected to the control unit by skipping fabric and an indicator of the width of the warp.

The oscillator 4 is also connected to the high-frequency amplifier 11, which is connected to the frequency detector 12. The output of frequency detector 12 is connected to the input of the comparator 13 is connected to the amplifier control signal 14 that is connected to the control unit stopping the machine and signal device.

In continuous receipt of tissue at the entrance of the machine, the device operates as follows. In the absence of a seam of fabric in the field of sensors 1, 2 at the output of the mixer 5 applies the signal to an intermediate frequency ƒP12. Resonance amplifier 6 passes only the signal of the intermediate frequency, which then passes through the detector 7, to the input of the low pass filter 8, and then converted by the DC amplifier 9 and the output of the counting trigger 10 is a high voltage level. When you hit a seam in the field only one sensor (1 or 2) change the capacitance sensor that causes a change in frequency according to the respective oscillator (3 or 4), that helps to change the intermediate frequency at the output of the mixer 5. Narrowband resonant amplifier 6 will not miss this signal and the output of the counting trigger 10 will drop the voltage from high level to low. At this point, will change the state of the trigger 10. As a result of passage of the suture through the other sensor is the state of the trigger 10 will change again. The signal from the trigger output is fed to the control unit, skipping the seam of the fabric and to the indicator of the width of the warp.

When you cut the fabric on the input of the machine and its exit from the working area sensors capacitance sensors decreases sharply, and the frequency of oscillation of the oscillator increases and exceeds the frequency ƒ0frequency detector 12. As a result, the output of the frequency detector 10 is formed by a voltage of opposite polarity (figure 2), which after amplification by a high-frequency amplifier 11 triggers the comparator 13, the output signal which after amplification by the amplifier 14 is fed to the control unit stopping the machine and a device for signaling indicating the cut tissue into the car and stop.

The device control charging of the tissue at the entrance of the textile machine, containing capacitive sensors, oscillators, mixer, narrowband resonant amplifier, detector, filter lower frequent the t, the DC amplifier, and the audit trigger connected to the control unit by skipping fabric and an indicator of the width of the warp, characterized in that the device additionally introduced a high-frequency amplifier, a frequency detector, a comparator and an amplifier control signal, and the input high-frequency amplifier connected to the output of one oscillator, and the output of high frequency amplifier connected to the input of frequency detector, the output of which is connected to the input of the comparator is connected to the input of the amplifier control signal, and the amplifier control signal is connected to the control unit of the machine stops and an alarm device.



 

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2 dwg

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