| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a music box for suitably suppressing the occurrence of an off performance tempo.SOLUTION: The music box controls the output torque of a motor when a pawl part 36 plays a vibration valve 18 in accordance with the type of the sound issued by playing of at least one vibration valve 18 by the pawl part 36 of a star wheel 14. Therefore, the music box previously predicts a load of a motor when the pawl part 36 plays the vibration valve 18 in consideration of respective characteristics of a plurality of vibration valves 18, and controls the output torque of the motor. Thus, the rotational speed of the motor can be kept constant regardless of the vibration valve 18 played by the pawl part 36.</p> |
