| 摘要 |
PROBLEM TO BE SOLVED: To prevent an elastic member for key returning from falling in case of a shock without increasing the number or cost of components by molding an elastic member fall prevention part such as a rib integrally with a key opposite the elastic member when a key is provided on a keyboard frame in a freely swinging state. SOLUTION: As a hammer 4 swings, a switch 15 for musical sound generation operates. While a white key 1 is pressed down, a leaf spring 6 curves through elastic deformation to approach the rib 10 of the white key 1. When the white key 1 is pressed down strongly by, for example, hitting, the hammer 4 quickly swings counterclockwise. At this time, the hammer 4 is to further swing counterclockwise from its originally stop position with its inertial force. When the hammer 4 further moves, the leaf spring 6 is to curve large. When the leaf spring 6 curves large, the leaf spring 6 possibly comes out of an engagement projection or recessed part 8, but the leaf spring 6 abuts against the rib 10, thereby suppressing excessive elastic deformation, i.e., the large curvature. |
