| 摘要 |
A robotic height sensor employs the defocussing of a spot of light to detect the motion of a probe contacting a reference object. The defocussing changes the electrical output of a photodetector which output is used to control a height drive mechanism. In a preferred embodiment of the invention, an intentional weakened portion of a shaft is provided for permitting limited lateral freedom of the shaft to accommodate minor irregularities in a workpiece.
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