Browse Prior Art Database

CASSETTE PAPER QUANTITY INDICATOR

IP.com Disclosure Number: IPCOM000025793D
Original Publication Date: 1988-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 83K

Publishing Venue

Xerox Disclosure Journal

Abstract

A desirable feature for a copying machine would provide a high reliability and reasonably accurate cassette paper quantity indicator. A system to monitor paper quantity includes a cassette holding a paper elevator of length r, and extending height h above the cassette when empty, a potentiometer and several contacts. An offset connecting arm is located between the cassette and the elevator, having a first end fixed with respect to the cassette, and a second end slidable through a channel on the underside of the elevator, as the elevator varies with height h in accordance with the paper supply thereon. As the paper supply in the cassette varies. the offset connecting arm angle 0, i.e., the angle between the offset connecting arm and the cassette, or some other reference, changes as the offset connecting arm slides through the channel. The changing angle is measured with a potentiometer at the end of the arm adjacent the cassette. The key design criteria is to pick the correct length of arm offset to give a full span of 0-90" for e. Using an ideal model. the offset arm length can be calculated for any given r (paper elevator length) and h (maximum elevator height) when the cassette is empty. The percent of paper in the cassette is then defined by the following:

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XEROX DISCLOSURE JOURNAL

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CASSETTE PAPER QUANTITY Proposed Classification INDICATOR U.S. C1.355/14SH Gerald L. Coy Int. Cl.GO3g 15/00

A desirable feature for a copying machine would provide a high reliability and reasonably accurate cassette paper quantity indicator. A system to monitor paper quantity includes a cassette holding a paper elevator of length r, and extending height h above the cassette when empty, a potentiometer and several contacts. An offset connecting arm is located between the cassette and the elevator, having a first end fixed with respect to the cassette, and a second end slidable through a channel on the underside of the elevator, as the elevator varies with height h in accordance with the paper supply thereon. As the paper supply in the cassette varies. the offset connecting arm angle 0, i.e., the angle between the offset connecting arm and the cassette, or some other reference, changes as the offset connecting arm slides through the channel. The changing angle is measured with a potentiometer at the end of the arm adjacent the cassette. The key design criteria is to pick the correct length of arm offset to give a full span of 0-90" for e. Using an ideal model. the offset arm length can be calculated for any given r (paper elevator length) and h (maximum elevator height) when the cassette is empty. The percent of paper in the cassette is then defined by the following:

The output of the potentiometer may be amplified as appropriate and conv...