Automatic piano tuner

Details Automatic piano tuner Automatic piano tuner

1996-09-30

1998-05-26

Gellner, Michael L.

Music

Accessories

Tuning devices

84458, G10G 702

Patent

active

057569134

ABSTRACT:
A piano tuning system having an electronic control circuit which receives sound through a microphone for a piano key. Based upon a comparison of this sound with stored piano fundamental frequencies, signals are sent to a drive unit. An electrically driven drive unit has a push/pull solenoid with an actuator which can move an internal drive shaft along a spline shaft. Movement of the drive shaft with respect to associated clutches moves any of three worm gears, each having dependent tuning head wrenches which turn the piano's tuning pins. Adjustments may be made to the spacing between worm gears to squeeze or expand their relative positions with respect to each other by an external housing thumb wheel. A method for implementing the tuning of piano notes is also set forth.

REFERENCES:
patent: 4481857 (1984-11-01), Havener
patent: 4958550 (1990-09-01), Kugimoto
patent: 5016515 (1991-05-01), Scott
patent: 5065660 (1991-11-01), Buda
patent: 5396827 (1995-03-01), Miller et al.

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