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This is a paper towel dispenser that can operate in two ways. You can pull a towel out yourself, or it can automatically feed a new towel for you using a motor. The dispenser uses a motor to drive a feed roller, working with a pressure roller, to dispense measured sheets, and a control circuit automatically switches between the manual pull mode and the automatic feed mode.
Why it matters: Filed before modern microcontrollers and motor drivers made sophisticated electronic control systems inexpensive and energy-efficient. The core electronic control for measured dispensing and mode switching is now far more accessible and reliable.
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