Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-04-29
1994-09-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, G01N 2186
Patent
active
053491998
ABSTRACT:
An apparatus for sensing the presence or an edge of a sheet, including a light emitter, a set of reflectors and at least one light detecting member. A light beam is reflected between the emitter and detector in a repeating wave form so as to intersect a sheet path; interruption of the light beam indicates the presence of a sheet. False indications of the presence, absence or true edge of the sheet such as may be caused by sheet holes or edge irregularities are avoided by the multiple passes of a beam of light across the path of the sheet. A continuous cleaning action of the sensor may be provided by the movement of the sheet over the light emitters, light detectors and/or reflectors. The sheet sensors are useful in detecting and/or correcting sheet skew, misregistration and other potential sheet handling problems. Through the use of optic fibers, wires or other means, the light emitter(s) and light detectors that may service a network of sheet sensors positioned throughout a copying or printing machine which may be centralized and otherwise assembled in efficient modularized configurations.
REFERENCES:
patent: 4743775 (1988-05-01), Edgar
patent: 4793605 (1988-12-01), Tajima
patent: 4805893 (1989-02-01), Kusaka
patent: 4885461 (1989-12-01), Mattila et al.
patent: 4924106 (1990-05-01), Tolmie, Jr.
patent: 5019249 (1991-05-01), Sugai et al.
patent: 5075543 (1991-12-01), Courtney
patent: 5235192 (1993-08-01), Chase et al.
Anderson et al., "Transmissive Document Sensor", IBM Technical Disclosure Bulletin, vol. 22, No. 4, Sep. 1979.
Amarakoon, "Optical Sensor", Xerox Disclosure Journal, vol. 10, No. 5, Oct. 1985.
Rabjohns Douglas T.
Roscoe Gary W.
Nelms David C.
Shami K.
Xerox Corporation
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