| 摘要 |
PURPOSE:To simplify structure and to reduce troubles by opening and closing tool holding pawls through a link mechanism in an arm. CONSTITUTION:A push-rod 28 given impetus toward its outer end by a spring 32 is incorporated in an arm shaft 21, and a tool 60 is held by giving outward impetus through a link mechanism 34 in an arm 23 to the opening and closing pawl 27 of tool holding pawls composed of a fixing pawl 25 and an opening and closing pawl 27. When the arm shaft 21 is retreated into a fitting hole 51 of the machine body, the tool 60 is released in such a way that the link mechanism 34 is bent and the opening and closing pawl 27 is retracted, because the tip of a release-rod 47 hits a flange 57 of a contact member 56 and pushed in. |
