Apparatus for injection molding of continuous slide fastener cha

Details Apparatus for injection molding of continuous slide fastener cha Apparatus for injection molding of continuous slide fastener cha

1979-07-03

1980-10-07

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

And means to apply stress to preform and uniting in stressed...

425545, 425814, 425129R, B29D 500, B29F 106

Patent

active

042265770

ABSTRACT:
Disclosed is an injection molding apparatus for the manufacture of continuous slide fastener chain. In the disclosed arrangement a small projection is formed on a portion of a runner molded together with a row of fastener elements at the time the elements are injection molded on a pair of stringer tapes, the small projection being detected as a portion of the as yet unfinished slide fastener chain when the stringer tapes are fed. Upon detection of the projection the introduction of the tapes into the molds is halted and the tapes, which have been intentionally fed to an excessive degree, are retracted by an amount equal to such excess. During the retraction the posterior end of the runner abuts a stopper provided on one of the pair of molds thereby to position the tapes for the next injection molding cycle.

REFERENCES:
patent: 2471258 (1949-05-01), Bolten
patent: 2742670 (1956-04-01), Morin
patent: 3590109 (1971-06-01), Doleman et al.
patent: 3659308 (1972-04-01), Kutik et al.
patent: 4074413 (1978-02-01), Taccani

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