Importance

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Abstract

A method of manufacturing sewing machine needles from a cylindrical length of wire by compression molding, comprising the steps of selecting the length of the wire substantially corresponding to two of the needles to be manufactured and a diameter of the wire corresponding to the thickness of a butt of the needles to be manufactured, the length being equal substantially to two coaxial connected needle blanks of one-piece for the needles to be manufactured, simultaneously working the two needle blanks to form the two needles, with the two needle blanks being worked such that the butts respectively face each other, by the steps of forming the blanks approximately to a final cross-sectional dimension of the two needles to be manufactured over their shanks and sections between the butts and shanks while leaving the butts of the two needles facing each other back to back and pressing grooves in the wire from transversely convexly curved outer surfaces of the wire within a region of the shanks, while simultaneously effecting the cross-sectional reduction by pressing opposite portions of the blanks at the shanks so as to form laterally projecting flat fins which leave therebetween the transversely convexly curved outer surfaces of reduced diameter substantially with the final diameter, and removing the flat fins in a subsequent step.

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First Claim