| 摘要 |
PURPOSE:To reduce an operating radius made by a connecting rod, by pivotally connecting each second link to space between an arm and each first link and thereby constituting its four-bar linkage, while connecting the space between frontward projecting parts of a symmetrical pair of second links. CONSTITUTION:A pair of first links 16 are supported with pivots 17 at both side of the rear of a setup table 3 free of longitudinal rotation like an arm 8. A tip of the first link 16 is rotatably supported with a pivot 20 on an almost central part of each second link 19 whose base end is supported with a pivot 20 on the front side of the arm 8 free of turning motion whereby its four-bar linkage is made up of the arm 8, the first link 16 and the second link 19. An interval between frontward projecting parts of the paired second link 19 is connected with a connecting rod 21 through which rigidity in the arm 8 is raised up. |
