Method of forming end stops molded on a slide fastener chain and

Details Method of forming end stops molded on a slide fastener chain and Method of forming end stops molded on a slide fastener chain and

1994-09-30

1996-07-16

Davis, Robert

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Flash or sprue removal type

29408, 29767, 264252, 264275, 425545, 425553, 425814, 425DIG51, B29C 3700, B29C 4514

Patent

active

055364608

ABSTRACT:
A method of forming end stops to a continuous slide fastener chain including element-free space portions at longitudinally spaced intervals, wherein as the chain is fed in the backward direction, a pair of rows of interengaged coupling elements extending on the downstream side of an element-free space portion is spread open by a chain splitting apparatus for subsequent molding of a separable end stop whereas a pair of rows of coupling elements on the upstream side of the element-free space portion is kept in engaged condition. After the separable end stop is molded, the chain is fed in the forward direction during which time a sprue portion and gate portions formed integrally with the separable end stop are caught by a chain splitting member of the chain splitting apparatus. The chain splitting member is then lowered to automatically remove the sprue portion and gate portions from the separable end stop.

REFERENCES:
patent: 4368570 (1983-01-01), Morita
patent: 4462154 (1984-07-01), Morita
patent: 4627807 (1986-12-01), Kuse
patent: 4640008 (1987-02-01), Kuse
patent: 4787140 (1988-11-01), Watanabe et al.
patent: 5054183 (1991-10-01), Mayerhofer

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