| 摘要 |
A precision drive assembly for producing constant accurate angular motion of an instrumentality about an axis and which includes a lead screw and a nut threaded to the lead screw. The lead screw is driven by a motor. A radial (tangent) arm is coupled in one end to the nut and at the other end to the instrumentality so that linear movement of the nut along the lead screw causes the radial arm to turn the instrumentality about its axis. Position-rate errors inherent in the drive assembly are corrected by mechanical cam means, or by electric/electronic drive means motor.
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