Patent ID: 7942895

Claim:
A working mechanical device comprising: a first drive rotor rotatable about a pivot axis extending in a direction perpendicular to a reference axis; a first intermediary rotor including an axial proximal end surface held in contact with said first drive rotor, and rotatable about said reference axis to change the direction of rotation of said first drive rotor; a first gear held in contact with an axially distal end surface of said first intermediary rotor at one side of the center thereof, and rotatable about an opening and closing axis perpendicular to said reference axis by rotation of the first intermediary rotor to change the direction of rotation of said first intermediary rotor; a first working unit connected to the first gear and rotatable about the opening and closing axis integrally with the first gear; a second gear held in contact with an axially distal end surface of said first intermediary rotor at an opposite side of the center thereof, and rotatable in a direction opposite to the direction in which said first gear rotates, about the opening and closing axis perpendicular to said reference axis by rotation of the first intermediary rotor to change the direction of rotation of said first intermediary rotor; a second working unit connected to the second gear and rotatable about the opening and closing axis integrally with the second gear; an end effector rotor rotatable about the pivot axis; and an end effector main shaft connected to the end effector rotor and rotatable about the pivot axis integrally with the end effector rotor; wherein, of the first drive rotor and the end effector rotor, only the first intermediate rotor is held in engagement with the first drive rotor, and wherein in accordance with the end effector rotor and the end effector main shaft rotating about the pivot axis, an end effector including the first working unit and the second working unit moves about the pivot axis.