| 摘要 |
PROBLEM TO BE SOLVED: To reduce a size in a projection/withdrawal direction of an advance/retreat member, for an advance/retreat mechanism.SOLUTION: An advance/retreat mechanism 1 of an advance/retreat member includes: a lifter 3; a coil spring 5; a lock pin 7 that restricts movement of the lifter 3; a case 2 housing the lifter 3 and the coil spring 5; an advance/retreat position controlling mechanism 9 that controls an advance position, a retreat position and reciprocating motion of the lifter 3; and a strike plate 11 on which the coil spring 5 strikes so as to energize the lifter 3. The strike plate 11 is disposed behind the lifter 3. The lifter 3 has an engaging part 27a to be engaged with the lock pin 7. When the lifter 3 moves to the retreat position, the engaging part 27a moves over the strike plate 11 to a rear side, to a position engageable with the lock pin 7.SELECTED DRAWING: Figure 9 |
