Invention Grant
US4037641A Method of fabricating sewing machine needles 失效
缝纫机针的制作方法

Method of fabricating sewing machine needles
Abstract:
The steps in the manufacture of a sewing machine needle are disclosed in which the needle blade is shaped by first being subjected to a flow-pressing operation to form a groove with raised side flanges and thereafter the eye portion is subjected to a die pressing operation which can further raise the side flanges. The needle is then completed by eye punching, pointing, and fin removal.
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