KEY DRIVING DEVICE OF PLAYER PIANO

摘要

PURPOSE: To simplify the structure of the key driving device used for the player piano. ;CONSTITUTION: A rotatable shaft 11 and an electromagnet 12 mounted on a key 13 are provided and a current is supplied to the electromagnet 12 to drive the key 13 by attracting it to the shaft 11. Thus, the key driving device in simple structure for the player piano is obtained.;COPYRIGHT: (C)1993,JPO&Japio