| 摘要 |
PROBLEM TO BE SOLVED: To provide a reciprocation switching device capable of reliably preventing operation failure during switching a reciprocating motion.SOLUTION: The reciprocating switching device comprises: a switching spring 17 compressed by a reciprocating motion body 14 from a position immediately before a stroke end in a reciprocation motion of the reciprocating motion body 14; a switching rod 18 provided movably by a repulsion force during compressing the switching spring 17; a pilot valve 19 switched and actuated by the switching rod 18; and switching valves 21, 22 for alternately switching working fluid acting on both faces of the reciprocating motion body 14 by switching pilot pressure outputted from the pilot valve 19. The pilot valve 19 fits a movable valve body 32 moving integrally with the switching rod 18 in a valve main body 31, and integrally fits a seal member 33 having elasticity with the movable valve body 32. The valve main body 31 has a function for moving the movable valve body 32 in a direction for releasing the repulsion force of the compressed switching spring 17 from a condition that the switching spring 17 is compressed by a predetermined amount according to a shape for gradually changing a contacting condition with the seal member 33. |
