Yoshida Kogyo K.k.

Yoshida Koygyo K.k.

Sakae Aimono

Yoshinori Fujisaki

An apparatus for stamping a monofilament to form shaped portions for slide fastener coupling elements, including: a stationary shaft having a mandrel extending from its one end; a pair of stamping rollers comprising a cylindrical roller and an annular roller; and a monofilament supply roller for supplying a monofilament. The apparatus stamps a monofilament so as to provide coupling head portions, leg turnover portions, deformed portions, grooves, etc. of slide fastener coupling elements.

Apparatus for stamping monofilament for slider fastener coupling elements

A method for stamping a monofilament between a pair of mating stamping rollers to form shaped portions for slide fastener coupling elements includes using an annular outer roller and a cylindrical inner roller with pressing projections on a mating stamping surface of at least one of the rollers. The rollers are positioned in such an arrangement that an outer circumferential surface of the cylindrical inner roller mates partially with an inner circumferential surface of the annular outer roller. The rollers are rotated in a common direction, and monofilament is supplied continuously to an area where an inner circumferential surface of the annular outer roller and an outer circumferential surface of the cylindrical inner roller mate. The monofilament is thereby pressed for a longer time in order to form accurately coupling head portions of slide fasteners.

Method of stamping monofilament for slide fastener coupling elements

In a method of forming coupling head portions on a monofilament of thermoplastic synthetic resin for production of a slide fastener coupling element, the monofilament is stamped from one side to form recessed small-thickness portions bulging from the other side of the monofilament, and then the monofilament is bent at opposite ends of each of the recessed small-thickness portions in such a manner that the concave side of each small-thickness portions faces outwardly.

Method of forming coupling head portions in production of slide fastener

Slide fastener elements made of a helically wound synthetic resin monofilament and the method of forming the same. According to a preferred embodiment, each fastener element comprises an interengaging head arranged on one-line in the longitudinal direction of the slide fastener elements, a pair of interengaging head-side widened portions formed at the both sides of the interengaging head, upper and lower legs extending from the both ends of the interengaging head through the pair of interengaging head-side widened portions respectively so as to transverse the longitudinal direction of the slide fastener elements and a turn extending between an upper leg of one slide fastener element and a lower leg of an adjacent slide fastener element through a pair of connecting portions formed at the both sides of the turn. The interengaging head is formed by pressing the monofilament to be sidened at its portion corresponding to the interengaging head. The interengaging head-side widened portions and the connecting portions are formed by pressing the monofilament to be widened adjacent to the head and the turn respectively and used as the bending portions of the monofilament into the slide fastener elements made of the helically wound monofilament.

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Toyama, Japan

Sakae Aimono