Advancement of stuck phonograph needles

Details Advancement of stuck phonograph needles Advancement of stuck phonograph needles

1976-10-13

1978-02-14

Haroian, Harry N.

Undertaking

G11B 300

Patent

active

040734951

ABSTRACT:
To advance a "stuck" phonograph needle, a solenoid is mounted in or on the tone arm so that movement of the plunger causes an impact on the arm tending to move the arm upwardly and forwardly (i.e. toward the center of the record). The turntable underside has a magnetic recording track which is tracked by a record and playback head. The record head records vibrations from the record grooves, via the stylus onto the magnetic track, one track at a time. On the next revolution of the turntable the playback head and this information is reversed in phase, and compared with the information currently received from the stylus. If the needle is "stuck", the recorded and current information should null out and this null is detected, causing the solenoid to be energized to create the impact to advance the stylus one groove of the record.

REFERENCES:
patent: 2079515 (1937-05-01), Ligh

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