| 摘要 |
PROBLEM TO BE SOLVED: To make the size of a jig selectable corresponding to the size of a workpiece, to improve use efficiency of a table, to save labor of operation by enabling operation equivalent to one pitch of a screw pitch by rotating a belt half (1/2 rotation) and to reduce a manufacturing cort with a simple construction. SOLUTION: Workpiece fixing blocks B1, B2 forming a pair by having mutually engaging abutting surfaces are provided with large/small diameter screw parts respectively screwed to a bolt forming an external thread of stepped structure comprising large/small diametric screw parts 1, 2 of mutually reverse screw. Here, a supporting or holding function of a workpiece is provided by abutting/separating the paired workpiece fixing blocks B1, B2 to be freely tightened/loosened.
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