Optical paper sensing method and apparatus

Details Optical paper sensing method and apparatus Optical paper sensing method and apparatus

B - Operations, Transporting

41

J

B41J 11/44 (2006.01) B41J 13/32 (2006.01) B65H 7/14 (2006.01)

Patent

CA 2053813

A method and apparatus for sensing the presence of a document moved to a printing station in a printer and for detecting skewness (if any) of the document at the printing station. A first light-detector pair arid a second light-detector pair are used, with the sensitivity of each of the detectors in the light-detector pairs being adjusted each time the printer is turned on. A controller and a stored program are used to adjust the sensitivity of the detector along with a resistor network providing steps of resistance. The particular resistance step to which a detector is adjusted also gives a measure of the useful life left for the detector.

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