Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1973-10-31
1976-01-13
Lawrence, James W.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
318577, G06K 1102
Patent
active
039327434
ABSTRACT:
A photo-copying device for controlling displacement of the working member of a metal gas-cutting machine following the line of the contour being copied, comprising a photoelectric transducer which provides circular scanning of the line of the contour being copied by means of an optical scanning beam for detecting the points of intersection of said beam with said contour line, the path of said beam in the contour plane being a circumference with its center lying approximately on said contour line, the optical scanning beam moves along said path at a constant angular speed and intersects said contour line at two points; a source of reference signals in the form of sine and cosine voltages; a first and a second drives for moving said photoelectric transducer along the X and Y axes, respectively; a third and a fourth drives for displacing said working member of the gas-cutting machine along its guides which are taken to be X and Y axes; a first and a second converters for converting instantaneous values of a cosine and a sine voltage of the reference signal, respectively, generated at the instants when the scanning optical beam intersects said contour line, into pulses that follow during each circular scanning period and that determine the number of equal steps of said first and second drives within each circular scanning period; said first and second converters also producing a logic symbol defining the direction of displacement of said photoelectric transducer along the X and Y axes.
REFERENCES:
patent: 2521946 (1950-09-01), Rathje
patent: 2853626 (1958-09-01), Wetzel
patent: 2988643 (1961-06-01), Inaba
patent: 3423589 (1969-01-01), Bardwell et al.
patent: 3502882 (1970-03-01), Von Voros
patent: 3515877 (1970-06-01), Baxter et al.
Kogut Andrei Isakovich
Sitnichenko Valentin Mikhailovich
Zamuruev Alexandr Mikhailovich
Grigsby T. N.
Lawrence James W.
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