| 摘要 |
PURPOSE:To shorten the time by controlling a rotating speed of a motor by a motor control circuit and restoring a movable member at high speed after processing a data. CONSTITUTION:There are provided a driving shaft 5 for rotating a magnetic disk 16 and a movable member 8 reciprocating radially of a magnetic disk 16 by holding a magnetic disk 7 and an output side of a reduction mechanism 31 including plural gears 24-30 is connected to a movable member 8. An input side of the reduction mechanism 31 and the driving shaft 5 are connected to a motor 2 a rotation direction of which is selectively controlled in a normal or a reverse direction and a motor control circuit 48 operating by a signal of a microcomputer 47 is provided. By the motor control circuit 48, a rotating speed of the motor 2 is controlled and after a data processing, the movable member 8 is restored to a home position at high speed.
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