| 摘要 |
A musical movement in which a drum has a series of pins that engage the reeds of a vibration plate to play a tune has an improved design which, among other things, provides three separate rotational outputs to engage and move objects such as toy figurines and the like. Two of these outputs are the opposite ends of a primary shaft. The third output is at the end of a secondary shaft which has an axis that is perpendicular to the axis of the primary shaft. To provide movement with minimum vibration and optimum dimensional stability, a first end plate of the drum is composed of a double gear having an interior set of teeth that are part of a ratchet mechanism for driving the double gear from a hand crank. The outer teeth of this double gear are a first bevel gear that engages a second bevel gear that in turn causes the secondary shaft to rotate. Two support tubes extend from either end of this double gear to surround and support the primary shaft. One end of the drum is firmly fixed to this end plate. The other end of the drum is firmly fixed to a second end plate. The second end plate has interior grooves which engage corresponding grooves on the primary drive shaft causing the primary drive shaft to rotate when the double gear end plate drives the drum which in turn drives the second end plate. This shaft extends through central openings on both of the end plates and extends out of the frame to form two drive shaft ends. The support tubes that extend out of each end of the double gear end plate are equal to each other and support a substantial portion of the primary drive shaft.
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