| 摘要 |
Apparatus for controlling the operation of individual spindles in a textile yarn-processing machine, such as a twister, spinning frame or the like. The apparatus preferably includes an endless tangential drivebelt engaging whorl portions of respective spindles for rotatably driving same, individually operable brake and positioning means may be used for stopping the rotation of and for positioning desired ones of the spindles in predetermined positions, and individually movable tension rolls for guiding engagement with the drivebelt to individually assume a driving position holding the drivebelt in tight frictional engagement with the respective spindle and to be movable to a substantially nondriving position holding the drivebelt in loose friction engagement with the respective spindle for allowing operation of the brake and positioning means. Preferably, the tension rolls include bowed peripheral surfaces for holding the drivebelt by full engagement therewith when in the driving position and for holding the drivebelt against sagging by engagement with only the outwardly extending center portion of the bowed surface when in the nondriving position.
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