Key actuating device of an automatic playing keyboard instrument

Details Key actuating device of an automatic playing keyboard instrument Key actuating device of an automatic playing keyboard instrument

1990-11-26

1992-04-28

Hix, L. T.

Music

Instruments

Automatic

G10F 102

Patent

active

051077396

ABSTRACT:
A key actuating device of an automatic playing keyboard instrument has a plurality of key actuator units each of which is provided for each of keys arranged above a key bed of a keyboard instrument, preferably between a balance rail and a front rail, and includes a coil or coils provided above the upper surface of the key bed for producing a magnetic field corresponding to a current supplied from outside and passing therethrough in a direction substantially normal to a rocking direction of the key, a plunger fixedly provided on the lower surface of the key, and a yoke or yokes provided fixedly on the coil or coils and opposing the plunger. A relative area of portions of the yoke and the plunger opposing each other or an interval between these portions is variable in the rocking direction of the key and the plunger is not in contact with the coil or or the yoke at any position of the plunger in the rocking movement of the key. Since there is no mechanical contact between the plunger and the coil or yoke, noise is hardly generated in key actuating operation and damage or wear of the plunger and key can be prevented.

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