| 摘要 |
PURPOSE: To prevent electric wires from bending or twisting when an arm rotates, winding around the arm, and being broken due to fatigue, and to enable the arm to endlessly rotate. CONSTITUTION: A slip ring 12 slides and rotates between a rotating side and a fixing side therein with keeping electric connection. Electric wires 22a, 23a, 24a are connected to the fixing side of the slip ring 12, and electric wires 22b, 23b, 24b are connected from an upper part of a first arm 4 to the rotating side through the inside of a hollow output shaft 11a of a motor 11. When a first arm 4 is rotated by the motor 11, connecting points of the electric wires 22b, 23b, 24b to the rotating side of the slip ring 12 are rotated with the rotating side of the slip ring 12 by the same amount as the first arm 4. Therefore, the electric wires 22b, 23b, 24b do not twist and wind around the arm 4.
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