Patent ID: 7249555

Claim:
An actuator having the function of control of operation displacement, which comprises of a cylinder in which a working flow is supplied, one or more piston reciprocally movable in the cylinder to divide the inner space of cylinder into the first space and the second space, a shaft rotatably mounted through the wall of the cylinder, a power transmission unit connected between the piston and the shaft to transfer the reciprocating force of piston to the shaft and the flow pathways connecting the first and the second space to the exterior solenoid valve, and the shaft could be rotated according to the action of solenoid valve, characterized in that the actuator further comprises of a magnet provided on one side of the piston, a guide 211 provided on one side of the cylinder perpendicularly to reciprocal direction of the piston, a slider being guided by the guide and moving perpendicularly to the reciprocal direction of the piston, a sliding plate provided outside of the cylinder and being movable along the reciprocating piston and having an inclined slot by which the slider is engaged, a magnetic sensor provided on one side of the sliding plate and being adjacent to the wall of the cylinder, the magnetic sensor being capable of sending a signal to the solenoid valve if the magnet is sensed, and an action range setting means having the scale representing displacement of the magnetic sensor, and the sliding plate is slid along the reciprocal direction of the piston as the slider moves.