Method and apparatus for gapping slide fastener chain

Details Method and apparatus for gapping slide fastener chain Method and apparatus for gapping slide fastener chain

1986-04-04

1987-05-12

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Of a slide fastener

29 332, 29770, B21D 5350, A41H 3706

Patent

active

046638172

ABSTRACT:
Continuous or other lengths of flat back plastic filament coil slide fastener chain is gapped in such a manner that the tape ends produced by the gapping are scrap-free and undamaged. The slide fastener chain to be gapped is held in a laterally taut state in a die and anvil apparatus while the interengaged coil elements are forced upwardly into engagement with blades which cleanly sever the outer leg portions of the coil elements, which leg portions are conveyed upwardly by suction. During the outer leg severing operation, the slide fastener chain is further stretched laterally and caused to spread apart slightly at its center line. The center portion of the chain between the removed coil outer leg portions is received in a control and stabilizing channel between the severing blades while an ascending punch acts on the remaining interior coupling portions of the coil elements and removes them cleanly from the tapes without damaging the tapes. The removed interior coupling portions of the coil elements are also conveyed upwardly by suction away from the gapping zone.

REFERENCES:
patent: 2987809 (1961-06-01), Burbank
patent: 3812573 (1974-05-01), Fukuroi
patent: 4307499 (1981-12-01), Isella
patent: 4490899 (1985-01-01), Schelling
patent: 4510662 (1985-04-01), Matsumoto et al.
patent: 4573383 (1986-03-01), Matsumoto
patent: 4589182 (1986-05-01), Imai

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