A pinion gear is fixed on a rotating shaft of a motor for supplying a driving
force
of a plurality of driving mechanisms. A speed reducing gear is engaged with the
pinion gear, and a sun gear is engaged with a speed reducing gear. A planet worm
includes a spur gear portion and a worm gear portion. The spur gear portion is
engaged with the sun gear. The planet worm is supported so as to be rotatable around
the shaft of the sun gear. When the planet worm is rotated to be positioned adjacent
to the cartridge room, the worm gear portion is engaged with a rewind spur gear
of a gear train. The rotational force of the motor is transmitted to a rewinding
fork through the gear train, and then the rewind fork is rotated.