| 摘要 |
A music box comprises a drive shaft for winding a spring, a drum which rotates with transmitted rotation of the drive shaft when a spring is released, a vibrating plate with reeds for playing music when struck by pins on the drum, speed governing device having a speed increasing gear train which transmits the rotation of the drive shaft and a worm shaft which is positioned in the final step of the speed increasing gear train and on which a rotor is fixed, a frame for rotatably supporting the drive shaft and one end of the worm shaft and on which the drum, the vibrating plate and the speed governing device are arranged and a housing unit which rotatably supports the drive shaft and has a spring enclosure for enclosing a spring and a support unit which is formed at an end of the spring enclosure and supports the other end of the worm shaft. The support unit comprises a bearing unit which rotatably supports the other end of the worm shaft at a center thereof, an outer frame formed to enclose the bearing unit and a slit being formed between the bearing unit and the outer frame.
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