Patent ID: 8708131

Claim:
A stopper cylinder for stopping a workpiece at a predetermined position by bringing the workpiece, which is transported in a predetermined direction, into abutment against a roller, and by maintaining a lever on which the roller is axially supported at a predetermined position, comprising: a body; a piston mechanism provided in an interior of the body and disposed for displacement along an axial direction of the body; the lever disposed rotatably on an end of the piston mechanism; a biasing member for urging the piston mechanism in the axial direction; and a lock mechanism disposed on the body, which restricts displacement of the piston mechanism along the axial direction upon supply of electric power to the lock mechanism, wherein, upon suspension of electric power to the lock mechanism, a displacement restricted state of the piston mechanism by the lock mechanism is released, whereby the piston mechanism is displaced a predetermined direction along the axial direction under an urging action of the biasing member.