The hardened anodic oxidation coating on sewing machine components(2A12)was investigated in different sulfuric acid density solutions with special apparatus.
采用自制脉冲恒流电源，研究了缝纫机零部件（2A12）在低硫酸浓度下的脉冲恒流硬质阳极氧化工艺。
Since the special material feeding parts, the machine can keep the back forward and the forward needle gauge absolutely the same during high speed sewing.
送料机构独特，使高速缝制时的倒顺送料针距能保持完成一致。
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