| 摘要 |
<p>PURPOSE:To reduce the size and weight of an actuator by providing a supply valve mechanism which is opened when the fluid pressure in a retreating operation chamber is less than a second set value at the time of retreating operation of the piston, and connects the retreating operation chamber to a fluid pressure supplying port. CONSTITUTION:In a reciprocating actuator AC, pressurized air is supplied to and discharged from an advancing operating chamber 25 by means of a changeover valve mechanism 30 and a control valve mechanism 60 synchronously to the reciprocating motion of a piston 22, while pressurized air having pressure between first and second set values is constantly kept in a retreating operation chamber 26 by means of a relief valve mechanism 80 and a supply valve mechanism 81. The piston 22 continuously repeats, accordingly, the reciprocating motion and a plunger 24 on an end of an output rod 23 also repeats its reciprocating motion in a plunger hole 15. A hydraulic pump HP is so constructed as to retreatingly drive the piston 22, thereby a spring for resetting the piston 22 is disused and the speed of reciprocating cycle and output of the actuator AC are increased.</p> |
