Patent ID: 8631720

Claim:
An industrial robot, comprising: a tool mounting portion to which a tool is to be mounted; a tool mounting rotation arm for rotatably supporting the tool mounting portion; a swing arm for swingably supporting the tool mounting rotation arm via a swing shaft; a shoulder for rotatably supporting the swing arm via a swing arm rotating shaft; a lower arm for rotatably supporting the shoulder via an upper arm rotating shaft; a rotation frame for rotatably supporting the lower arm via a lower arm rotating shaft; a tube arranged along the lower arm from the rotation frame to the shoulder; and a robot base for rotatably supporting the rotation frame via a rotation frame rotating shaft; wherein the tool mounting rotation arm includes a tool mounting rotating portion in a cylindrical shape, the tool mounting portion being rotatably engaged with a inner periphery of the tool mounting rotating portion, wherein a flow path for supplying driving gas to the tool mounting portion is arranged from the robot base to the tool mounting portion through the interiors of the rotation frame, the tube, the shoulder, the swing arm and the tool mounting rotation arm, wherein the flow path includes a rotational flow path formed along a sliding surface of the tool mounting portion against the tool mounting rotating portion when the tool mounting portion is rotated, and wherein the rotational flow path is formed by a tool mounting rotating portion side groove portion formed over the entire circumference of the inner periphery of the tool mounting rotating portion and a tool mounting portion side groove portion formed over the entire circumference of an outer periphery of the tool mounting portion and facing the tool mounting rotating portion side groove portion at the sliding surface.