Producing disc records

Details Producing disc records Producing disc records

1977-04-12

1979-02-20

Hinson, Harrison L.

Turning

Severing or cut-off

Processes

82 58, 82 702, B23B 100, B23B 306

Patent

active

041400356

ABSTRACT:
When trimming a pressed disc record it is desirable that the central hole is concentric with the trimmed edge. Hitherto the central hole or marker produced at the pressing stage has been engaged on transfer while the record is still held in a transfer means to force the record into position for trimming. The invention provides that the record is first transferred and then centralized at the trimming position, while freely movable, e.g. by inserting a taper through the central hole to move the record to the center of the trimmer. Damage to the central hole is thus reduced.

REFERENCES:
patent: 1821611 (1931-09-01), Bonisieur
patent: 2134171 (1938-10-01), Brown
patent: 2584479 (1952-02-01), MacDonald
patent: 2839306 (1958-06-01), Bayless
patent: 3186029 (1965-06-01), Joseph

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