A drive control unit of the present invention includes: a first external force detecting section for detecting that an external force is applied to a first moving object body movable back and forth in a single direction; and a second initialization processing section which when it is detected that the external force is applied to the first moving object body by the first external force detecting section, moves at least one of second moving object bodies movable back and forth in the single direction to a predetermined second initial position and when it is not detected that the external force is applied to the first moving object body, does not move the second moving object body.