本帖最后由 zhangshuoshi 于 2013-8-22 07:33 编辑 当机针运动到最前往后回5mm~6mm时,钩针尖刚好钩在机针针孔后0.5mm~1mm凹槽位置,此时把钩针向上离开机针0.5mm处时,轻轻拧紧小偏心轮固定夹螺钉,然后观察钩 ...
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