Metal working – Method of mechanical manufacture – Of a slide fastener
Patent
1987-03-02
1988-04-19
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Of a slide fastener
29 332, 29770, B21D 5350, A41H 3706
Patent
active
047380160
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. Filament coil fragments remaining near one or both ends of the gap are removed by projections on each end of the punch.
REFERENCES:
patent: 2987809 (1961-06-01), Burbanke
patent: 3812573 (1974-05-01), Fukuroi
patent: 4307499 (1981-12-01), Isalla
patent: 4490899 (1985-01-01), Schelling
patent: 4510662 (1985-04-01), Matsumoto et al.
patent: 4573383 (1986-03-01), Matsumoto et al.
patent: 4589182 (1986-05-01), Imae
Eley Timothy V.
O'Brien Anthony A.
Talon, Inc.
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