| 摘要 |
A variable speed drive comprising a drive motor mounted in a frame for pivotal movement by means of a reversible motor and screw drive unit operatively connected to the drive motor. A shaft to be driven is mounted parallel to the shaft of the drive motor and power is transmitted from the drive motor to the shaft to be driven through a belt and variable speed pulley, preferably of the type in which the diameter of the pulley decreases as the motor shaft is moved away from the shaft to be driven, and vice versa.
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