A rotation motor 7 is fixed to a movement body M in such a manner that the rotational axis Ar of a rotor 7a passes through the center of gravity G of the combined movement body MU and intersects a plane P including the center of gravity G and the trajectory path S of movement of the linear motor 53. 回転型モータ7を、回転子7aの回転軸Arが移動合体MUの重心Gを通り、且つ重心Gとリニアモータ53の移動軌跡Sとを含む平面Pと交差するように移動体Mに固定する。 - 特許庁