Method and apparatus for forming a row of zigzag coupling elemen

Details Method and apparatus for forming a row of zigzag coupling elemen Method and apparatus for forming a row of zigzag coupling elemen

1986-03-28

1987-05-19

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Of a slide fastener

29769, 29 332, 425814, B21D 5352, A41H 3706, B29D 500

Patent

active

046656030

ABSTRACT:
In a method and apparatus for forming a row of zigzag coupling elements, the entire rotating die wheel is heated by a built-in interior heater so as to remain at a temperature slightly lower than the temperature at which a monofilament of thermoplastic synthetic resin is deformable, the monofilament being folded in an annular peripheral groove of the die wheel into a row of U-shaped coupling element blanks. Then, immediately before coupling heads are shaped, the monofilament in the form of U-shaped coupling element blanks received in the annular peripheral groove is additionally heated locally by an exterior heater outside of the die wheel such that its temperature rises to a heat setting temperature.

REFERENCES:
patent: 3054149 (1962-09-01), Streicher
patent: 3594865 (1971-07-01), Erb
patent: 3672805 (1972-06-01), Perepp
patent: 3688805 (1972-09-01), Moertel
patent: 3770361 (1973-11-01), Heimberger
patent: 4182600 (1980-01-01), Moertell
patent: 4251912 (1981-02-01), Yoshida

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