订扣机订两眼扣时,靠近身边偏右一点会有一个针眼,导致扣子经常裂开,用手摇机针每次又能对准扣眼中心。检查了一上午,后来无意中发现订扣结束时扣夹抬起时会往上弹,我觉得是扣夹弹起时扣子撞上机针了,就用手把扣 ...
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