| 摘要 |
PURPOSE:To simplify a circuit configuration and to reduce in cost and size a driving circuit for a plurality of stepping motors by providing a selector for selectively supplying a power source voltage to the motors commonly connected to the driving circuit for driving the plurality of the motors. CONSTITUTION:When a plurality of stepping motors 10 (10a-10c) provided for sheet feeders for sheet cassettes provided corresponding to sizes and types of sheets for a printer such as a copying machine, etc., are controlled to be driven, the motors 10 are commonly connected to a driving circuit 2. Further, the circuit comprises selecting circuits 11 (11a-11c) for selectively supplying driving voltages corresponding to the motors 10 in response to selection signals. Reverse blocking diodes D1-D3 are provided between the motors 10 and the circuit 2, and other ends of flywheel diodes D4-D6 connected at one ends to the ground are connected between the diodes D1-D3 and the phases of the motors 10. |
