| 摘要 |
In a rotary drum mixing machine of the kind in which the drum is rotated in opposite directions to mix and eject its contents respectively by a prime-mover operating through driving and driven means on a prime-mover driven shaft and the closed end of the drum respectively, reversal of the direction of rotation of the drum can be effected without reversing the prime-mover by a pivotally mounted pair of gear wheels which are continuously driven in opposite directions by the prime-mover and are alternately movable into operative engagement with the driving means for the drum.
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