| 摘要 |
PROBLEM TO BE SOLVED: To easily correspond to a change in dimensions of a board material, by arranging an arm unit slidably while maintaining a confronted position in a guide juxtaposed in parallel, also mounting an arm formed in down facing L shape having a hook at a tip end to be extensible/contractible in an orthogonal direction to the guide on the arm unit. SOLUTION: A frame of a pair of arm units 5 is arranged on a guide 4 formed in parallel to an upper surface of a down-step frame 3, slidably along the guide 4. A down-facing L-shaped arm 10 having a hook 13 at a tip end by each one pair is mounted extensibly/contractibly respectively in an opposite direction, in an upper surface of this frame. A tip end of a horizontal part of each arm 10 is connected to a rod tip end part of a motor cylinder 14, so that the confronted hook 13 can be opened/closed in a position of desired equal distance from a center position by extending/contracting the horizontal part of each arm 10 along a guide 12. By this constitution, a desired position on a bottom surface of a board material of various dimensions can be easily supported by the hook 13.
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