To well transmit driving force of a motor provided on a fixed table to a rotary shaft supported on a movable moving table.

A rotary shaft 14 is supported on a movable moving table 3, a rubber roller 18 is provided coaxially with the rotary shaft 14, a motor 30 is attached to a base table 2 so fixed and installed as to face the moving table 3, a rotational driving table 31 is fixed to a shaft 30a of the motor 30, and a pair of rubber rollers 33A, 33B respectively set at such a distance as to be brought into contact with the rubber roller 18 symmetrically with respect the shaft 30a of the motor on the rotational driving table 31 so that the rotational directions may be different from each other, and in which a pair of one-way clutches 32A, 32B are mounted are provided. The rubber roller 18 provided on the rotary shaft 14 is made to be approached to and separated from a pair of rubber rollers 33A, 33B provided on the rotational driving table 31 with the movement of the moving table 3, and driving force is applied from a pair of rubber rollers 33A, 33B to the rubber roller 18 provided on the rotary shaft 14 in the stop of the moving table 3.