| 摘要 |
PROBLEM TO BE SOLVED: To stabilize rotational cyclic time of a rotational body of a rotational driving device. SOLUTION: A rotational body (rotational frame B) is turnably supported onto a rail 14 laid on all circumference of a cylindrical housing bath, while being driven by a roller (driving roller) 23 rotatably supported to an inner end of a column arranged on a center of the housing bath whose upper surface is opened, and rotatably attached to an outer end. The rotational body is rotated around the column inside the housing bath by driving the roller 23 by means of a motor 25. In such a rotationally driving device, the roller 23 is made of material harder than that of the rail 14. A projection 23b2 is formed on an outer peripheral surface of the roller 23, for forming an indentation on the rail 14 by the projection 23b2.
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