| 摘要 |
PURPOSE: A guide block is provided to exchange the whole front block by detachably combining a front guide block which is fixed to a rear surface of a front block to a spring rod. CONSTITUTION: A front guide block(51) is fixed to a rear side of a front block(30). A frame guide block(52) is fixed to an inner side of a frame(10). The front guide block has a hanging raod(55) to other side of a spring rod(53). The frame guide block has a signal fixing groove(522) on upper part of a second guide body(521).
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