| 摘要 |
PROBLEM TO BE SOLVED: To enlarge the maximum rotation angle of an arm while adopting a structure for supporting a working shaft by two tie bars. SOLUTION: A second arm 4 is formed so that a side collar 4a will linearly extend from a rotation end part to a base part side. Tie bars 42 are arranged inside the arm closer to its center than the side collar 4a when looked from the axial direction of a rotation shaft of the second arm 4 (upside).
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