| 摘要 |
PROBLEM TO BE SOLVED: To provide a robot arm free to revolve an electric tool on a horizontal surface and move in the longitudinal and vertical directions, favourable in workability and low at device cost. SOLUTION: Lower end parts of a pair of support side parallel arms 16a, 16b are pivotally installed free to revolve within a surface in the vertical direction with an interval from each other on a support bracket provided free to revolve within a horizontal surface on a support. Upper end parts of the support side parallel arms 16a, 16b are respectively pivotally installed on a joint bracket 18, and upper end parts of a pair of tool side parallel arms 26a, 26b are pivotally installed free to revolve within a surface in the vertical direction with an interval from each other in the same way on the joint bracket 18. Thereafter, lower end parts of the tool side parallel arms 26a, 26b are respectively pivotally installed on a tool side bracket 24 furnished with an installation part of an electric tool, and a spring to tensionally energize the support side parallel arms 16a, 16b to each other is suspended between a pair of the support side parallel arms 16a, 16b.
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