Patent ID: 7125059

Claim:
A hand device for working robot comprising: a grip capable of gripping or releasing a workpiece; a movable body provided on a driving base so as to extend or retract by a driving means; a link means for linking an extending or retracting movement of the movable body with a gripping or releasing movement of the grip; and a workpiece drop prevention means for preventing a workpiece from dropping by attaching to the movable body to stop the releasing movement of the grip when the driving means is stopped, wherein the workpiece drop prevention means further comprises a protrusion stick with a tapered tip, a support rail supporting the protrusion stick so as to slide the protrusion stick between a protrusion position wherein the protrusion stick abuts the movable body and a retracted position wherein the protrusion stick is free from contacting the moveable body, a momentum means for pushing the protrusion stick supported by the support rail at the protrusion position, and a holding means for holding the protrusion stick at the retracted position resisting against the pushing of the momentum means in a normal state and for releasing the protrusion stick when the driving means is stopped operating.