| 摘要 |
An improvement in the action for that type of plectrum piano which uses a pneumatic piston to provide a variable pluck loudness. The pneumatic piston is joined by a connecting rod to a crank arm on a rotatable pick body, the latter being driven vertically past a vibratable element when the instrument is played. The plectrum is mounted below the center of rotation of the pick body and describes both a lateral and a vertical motion during the pluck stroke, the pluck loudness being proportional to stroke velocity. The improvement includes the use of a gravity acting ball valve joint between the connecting rod and the piston to provide the repeat function.
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