Line-trace read-out method and device for the servo-control of machine tools
OwnerJean Peiffert, Roger S. Barbedienneinventors
Life of this patent
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Abstract
The line-trace to be read-out is illuminated by a light spot scanning radially from, and by rotation around, a center that it set near the line-trace to be read, the radial scan having its own scan frequency and the scan turning around the center at a specific frequency of rotation. A signal is formed corresponding to the contrast modulation between the line-trace and the surrounding background, which is processed to give a signal corresponding to the minimum distance between the scan sweep center and the line-trace, the latter signal being processed further to produce the co-ordinates needed for directing the servo-control means of a machine tool.
Claims8
A method of line-trace read-out with a view to commanding the operation of a machine through appropriate servo-control means by processing a signal from a photo-electric cell, comprising the steps of illuminating a line-trace by a light spot scanning radially from, and by rotation around, a centre that is set near the line-trace to be read, the radial scan having its own scan frequency and said scan turning around said centre at a specific frequency of rotation, receiving a first signal from the modulation of the contrast between the line-trace and the surrounding background, forming a second signal corresponding to the minimum distance between the scan sweep centre and the line-trace, and processing said second signal to produce the co-ordinates needed for directing said servo-control means.
Dependencies are inferred from the claim text.