Ncr Corporation

George J Eberhardt

Larry D Turvy, Jr

Richard E Loughman

Richard E Rogers

Thomas L Hermann

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 and 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.

Method of determining detector lifetime using a stepped resistor network

Optical paper sensing method and apparatus having light source and

A method of producing a printer so as to effect a low profile for sit/stand operations and to facilitate the removal of a jammed document from a print station in the printer. The printer is formed of a bottom portion and a top portion which are hinged together to enable these portions to be moved from an operative or assembled position and an open position which exposes the print station to facilitate the removal of a jammed document. The bottom portion has an overall height which is small relative to the overall height of the top portion so as to make the printer conducive to sit/stand operations. Latches are used to detachably latch the bottom and the top portions in the assembled and open positions mentioned.

Growing community of inventors

Centerville, OH, United States of America

George J Eberhardt