用不同面料试机子, 不论薄料厚料面线,压力怎么调,都会看到底线露出来,后来调紧了下底线张力,厚布料好些了,露出一点点,可是薄料还是不行, 用4423走窗帘布也是针角看的到底线, 视频里也是实实在在看到线迹 ...
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