| 摘要 |
A level control device is disclosed comprising a paddle on a rotary shaft projecting from a housing, a carrier disc coupled to the shaft and supporting a plurality of torque-transmitting levers having first arms engageable by drive pins or an apertured drive disc on an output shaft of an electric motor, an axially movable control plate biased toward the carrier by spring means which also cause the control plate to rotate with the carrier, the levers having second arms disposed between the carrier and the control plate for moving the control plate away from the carrier when the driving torque transmitted by the first arms increases due to increasing drag on the paddle caused by rising granular material coming into contact with the paddle, and a control switch operable by the movement of the control plate away from the carrier. The position of the switch is adjustable to provide a sensitivity adjustment. A slip clutch may be provided between the carrier and the paddle shaft.
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