Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1976-05-12
1977-01-11
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
318577, H01J 3912
Patent
active
040029000
ABSTRACT:
The phototracing system for controlling the motion of the work-performing member of a two-coordinate copying machine for pattern-cutting of sheet materials, wherein the tracing photo-head cooperates with a template drawing wherein the line being traced is represented as a "black" to "white" transition, by means of an optical scanning beam. The aperture of the optical beam in the plane of the template drawing has finite dimensions and is driven through a circular scanning motion at a permanent angular speed about the optical line of the tracing head.
The phototracing system includes a train head with a photoelectric transducer connected with two shapers of short pulses of the signal of the prefixed instantaneous change from "white" to "black" and from "black" to "white", respectively. The output of the second shaper of the short pulse of the prefixed instantaneous change from "black" to "white" has connected thereto means for delaying each pulse. The output of the said first pulse shaper and the output of the delay means are connected through a three way switch with the first inputs of two converters of the said signal of the prefixed instantaneous change of "black" and "white" and of the functional sinusoidal and cosinusoidal voltages into signals representative of the required velocity vectors of the motion of the tracing head along the "X and Y" axes. The outputs of these converters are connected with the inputs of two servomotors driving the tracing head along the X-- and Y-- axes and also with the inputs of two other servomotors moving the tool of the copying machine along similar axes.
REFERENCES:
patent: 3742220 (1973-06-01), Okuma
Kogut Andrei Isakovich
Sitnichenko Valentin Mikhailovich
Zamuruev Alexandr Mikhailovich
Grigsby T. N.
Smith Alfred E.
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