| 摘要 |
A chuck rotatable about an axis has an actuator system with a housing rotatable about the axis and connected to the chuck, a threaded rod in the housing, extending along the axis, connected to the jaws, and axially displceable to radially shift the jaws, an electric motor, a drive wheel rotatable about the axis on the housing and driven by the motor, and a harmonic drive. This drive has a wave generator rotationally fixed to the drive wheel, a flexspline surrounding the wave generator and having external teeth, and a ring gear fixed on the housing meshing with the ring gear, and normally rotating jointly with the threaded shaft, a threaded connection between the flexspline and the threaded rod. A sensor on the chuck detects an instantaneous rotation speed of the chuck, and a controller connected between the sensor means and the electric motor axially shifts the chuck in accordance with the sensed rotation speed.
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