PURPOSE: To prevent a motor from being driven erroneously in the film winding direction again after the power supply to the motor is stopped, by inverting a semiconductor switch to stop the power supply to the motor in response to the increment of the motor current accompanied with impossibility of film winding and providing a feedback circuit.

CONSTITUTION: If a motor 1 is forcibly stopped in course of the film winding operation due to the motor 1, a transistor (TR) (semiconductor switch) 27 of a film stretch detecting circuit 24 is inverted to the break state by the increment of the motor current, and a capacitor 31 is charged by a constant current source 30, and the TR 27 is held in the inverted break state, and thus, the power supply to the motor 1 is stopped. Since a feedback circuit 54 using a TR 40 is provided for the TR 27, the power supply to the motor 1 is stopped, and the TR 27 is held in the break state continuously even after the cause which leads the TR 27 to the break state disappears.