Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1977-12-05
1979-03-27
Kominski, John
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
242 571, 226 20, B65H 2526
Patent
active
041467973
ABSTRACT:
A device for detecting the position of the side edge of a web comprising a light emitting source, and a lens for condensing light emitted from said light emitting source and forming a beam of light in the vicinity of a reference datum point set at the side edge of said web. An optical fiber transmits light corresponding to the brightness of three predetermined areas of the beam. A first area is located toward web side of the datum point; the second area is located on the opposite side of the datum point and at a position where the side edge of the web does not cross, and the third area is located at a position between the first two areas. A photoelectric converter circuit converts the light introduced by the optical fiber from each of the three areas into respective electric signals. A comparison circuit connected to the output of said photoelectric conversion circuit compares a first voltage level corresponding to the brightness at the first area with a second voltage level corresponding to the brightness of the second area, and simultaneously compares a third voltage level corresponding to the brightness of the third area with the first or said second voltage levels. The position of side edge of said web is corrected based on the result of these comparisons.
REFERENCES:
patent: 3232547 (1966-02-01), Thiede et al.
patent: 3368726 (1968-02-01), Funk et al.
patent: 3570735 (1971-03-01), Kurz
patent: 3833816 (1974-09-01), Emura et al.
patent: 3912193 (1975-10-01), Calvaer
patent: 4021031 (1977-05-01), Meihofer
patent: 4049213 (1977-09-01), Hank et al.
patent: 4077579 (1978-03-01), Seleski et al.
Kominski John
Tokyo Kikai Seisakusho Ltd.
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