| 摘要 |
A gripper used in, for instance, a bag filling apparatus including a pair of gripper arms provided with chuck holders. Each chuck holder includes first and second tubular portions, first and second tubular members slidably inserted therein, and first and second air cylinders installed within the tubular portions. An inside fixed chuck element is affixed to the tip end of the first tubular member, and an inside movable chuck element is attached to the tip end of the piston rod of the first air cylinder; in addition, an outside fixed chuck element is affixed to the tip end of second tubular member, and an outside movable chuck element is attached to the tip end of the piston rod of the second air cylinder; and the movable chuck elements are opened and closed with respect to the fixed chuck elements by the advance and retreat motions of the respective piston rods. |
