Machine for manufacturing zig zag wire binders

Details Machine for manufacturing zig zag wire binders Machine for manufacturing zig zag wire binders

1978-08-14

1979-12-18

Larson, Lowell A.

Wireworking

Crimping

140 71R, 72187, B21F 4516

Patent

active

041789725

ABSTRACT:
A pair of die rolls of novel construction are disclosed which act upon a continuous wire having a preliminary zig zag formation in order to impact the bends in the wire and thus narrow the formation, preparatory to use of the wire as a ring binder. Each roll has a continuous spiral groove with a first section of progressively narrowing width which is substantially wider than the wire bend which it accommodates, and a second section of constant width. A knob or projection is formed on at least one side wall of the groove in each roll at the juncture of the first and second sections, which impacts the wire bend as it passes, giving it a set.

REFERENCES:
patent: 2737212 (1956-03-01), Huszar
patent: 2868236 (1959-01-01), Smith
patent: 3566927 (1971-03-01), Adams

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