| 摘要 |
A movable member supporting mechanism includes a support ring; first and second rotatable members provided inside the support ring and supported thereby to be integrally rotatable and to be movable relative to each other in an axial direction thereof; a linearly moving member provided inside the support ring and coupled thereto to be integrally movable with the first rotatable member in the axial direction; a biasing device biasing the first and second rotatable members in opposite directions; and first and second position limiting surfaces formed on an inner peripheral surface of the support ring and are provided apart from each other in the axial direction. The linearly moving member is biased by the biasing device via the first rotatable member. The first and second position limiting surfaces limit positions of the linearly moving member and the second rotatable member in the axial direction, respectively.
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