| 摘要 |
Preselected teeth of a gear tooth are truncated by removing their radially outermost ends. Thus, whenever teeth that should mesh become misaligned, the truncation allows the teeth to quickly return to their proper meshing. This reduces the sound generated by nonmeshing teeth. In a tape player using gears having preselected truncated teeth, an idler arm carries an idler gear at its free end and is pivotal into first, neutral, and second positions. At low speed operation, when a cassette is in the player, a pair of driving gears are not intermeshed, and the first position of the idler gear causes recording or playing back and the second position causes rewinding. At high speed operation, when no cassette is in the tape player, the driving gears are intermeshed, and the first and second positions of the idler arm cause fast forwarding and rewinding, respectively.
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