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It does not use a tension detector but uses the thickness and the number of revolutions of fabric to increase or decrease the output of powder brake or powder clutch to control the tension.
It is an open loop type semiautomatic tension control device.
The proximity sensor is installed to directly detect the number of revolutions of winders and unwinders.
It uses a variable resistor or ultrasonic distance measuring sensor to check the amount of winding and unwinding to control.

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