| 摘要 |
A couple of coupling portions 7 are provided on an outer peripheral side of a rotational shaft 6, a stationary ring 13 is mounted on a fore end portion of an air motor 5, a rotatable ring 14 is rotatably attached to a stationary ring 13, and a couple of slide plates 16 are provided between the stationary ring 13 and the rotatable ring 14 movably in radially inward and outward directions of the rotational shaft 6. Further, a slider shift mechanism 17 is provided on the stationary ring 13 and the rotatable ring 14 to bring each slide plate 16 into and out of engagement with the coupling portions 7 in step with a rotational movement of the rotatable ring 14. Thus, for locking the rotational shaft 6 in a fixed state, what is required for an operator is simply to grip and turn the rotatable ring 14 with one hand to engage the slide plates 16 with the coupling portions 7 by the slider shift mechanism 17. In this state, a rotary atomizing head 8 can be mounted on or dismantled from the rotational shaft 6.
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