| 摘要 |
A centering axis (2) that can be moved freely is located between upper and lower supporting axes (4,4'), which have fixing bolts (10') and notch marks (12). A lever (16) and pinion (13), which agrees with the rack gear of the centering axis, are located on a moving board (17). Front-part builders (18,18'), rear-part builders (18", 18"') and a vice-builder (21) are equipped rotatably on the rear of the moving board.
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