| 摘要 |
A power chuck has a stationary housing, a chuck spindle rotatable in the housing about a chuck axis, a plurality of jaws carried on the chuck body movable radially toward and away from one another, an actuator shaft movable axially relative to the body, a jaw actuator connected between the actuator shaft and the jaws for displacing same radially outward on displacement of the element in one axial direction and for displacing the jaws radially inward on opposite axial displacement of the shaft, and a motion converter carried on the spindle. The motion converter has a pair of coaxial input wheels centered on and rotatable about the axis on the spindle, gears connected between the input wheels for synchronously oppositely rotating same, an output element axially displaceable on the spindle and axially coupled to the shaft, and gearing interconnecting the input wheels and output element for axial displacement of the output element in one direction on rotation of one of the input wheels in one sense and for axial displacement of the output element in the opposite direction on rotation of the one input wheel in the opposite sense. Respective brakes between the housing and the input wheels can selectively rotationally retard rotation of the respective wheels relative to the housing.
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