| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an automatic playing piano which uses driving means facilitating string striking adjustment. <P>SOLUTION: The automatic playing piano uses a driving device including a stator 50 composed of a coil 52 and a needle 54 composed of a permanent magnet as a driving device 5 which swings a key. The driving devices 5 for the respective keys are arranged zigzag, and a shield member which reduces influence of magnetic flux of the needles 54 of the adjacent driving devices 5 is arranged between the adjacent driving devices 5. When the permanent magnet is used as the needle 54 like this automatic playing piano, driving force of the stator 50 to a stroke quantity of the needle 54 (quantity of energization to the stator) shows linear relation, so that keystroke adjustment can be easily made. Further, the needle 54 never moves erroneously under influence of magnetic flux of the adjacent driving devices 5 because of the shield members. <P>COPYRIGHT: (C)2013,JPO&INPIT |
