Process for making cassette spring

Details Process for making cassette spring Process for making cassette spring

1987-05-22

1989-07-11

Echols, P. W.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

53447, 267158, B21F 3500

Patent

active

048458201

ABSTRACT:
A method for making a reel-pressure spring for a magnetic tape cassette begins by feeding a strip of spring material from a traverse-wound coil into a first work station of a punch press. The strip material has a width equal to the width of the finished spring. A die pierces the strip material to form mounting holes. The strip material is then fed into a shaping die of a second work station. A cutoff punch severs a blank from the end of the strip material by cutting across the full width of the strip. A shaping die at the second work station shapes the blank into a finished spring, which is then ejected from the second work station to a discharge chute. Finished springs are stacked in the discharge chute in the order in which they are made in the second work station. The stack is packaged so as to maintain the stack intact until such time as the springs are assembled into a cassette.

REFERENCES:
patent: 3014601 (1961-12-01), Swanson
patent: 3194098 (1965-07-01), Kimball et al.
patent: 3195228 (1965-07-01), Beacham
patent: 3937456 (1976-02-01), Gruodis et al.
patent: 4717091 (1988-01-01), Schoettle et al.

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