Document sensing apparatus

Details Document sensing apparatus Document sensing apparatus

B - Operations, Transporting

65

H

B65H 43/02 (2006.01) B65H 7/04 (2006.01) G06K 13/067 (2006.01) G07D 11/00 (2006.01)

Patent

CA 2045836

DOCUMENT SENSING MEANS Abstract A document sensing apparatus includes a phototransistor (12) for generating a first or second voltage depending on whether or not, respectively, a document is present at a sensing location, and a capacitor (36) for providing a second voltage whose peak value is determined by said second value. A voltage comparator (30, 38, 40) compares said first and second voltages and provides an output signal indicative of the presence of a document at the sensing location if said first voltage is less than a predetermined fraction of said second voltage. A microprocessor (44) controls the operation of a circuit (74-1) which provides, as necessary, a charging current to said capacitor (36) so that, while a document is present at the sensing location, said second voltage is prevented from falling by a significant amount, thereby preventing problems occurring if a document remains at the sensing location for a prolonged period due to a feeding irregularity.

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