| 摘要 |
An indexing mechanism comprising a body ( 10 ) mounted so as to be rotatble about an axis; means ( 3 ) for rotating said body about said axis; first cam means ( 9, 10 ) for displacing said body along said axis away from an axial rest position during rotation of said body in a first direction; biassing means ( 11 ) for restoring the body to its axial rest position on completion of a rotation or a predetermined portion thereof of the body; means ( 8 a) for detecting the axial movement of the body when it is being restored to its axial rest position; and second cam means ( 2, 9 ) permitting said body to be rotated in a second direction opposite the first direction.
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