Optical Paper Sensing System
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-15
This article, describing circuitry, hardware, and application, eliminates a design problem which, to date, has had no practical solution. Various copiers have collators of the "moving bin" type. That is, the output tray moves up and down during normal operation. In order for the machine to sense when the trays are full or empty (and thus prevent paper jams) these moving bins need "paper-present" sensors. Implementation of these sensors causes design problems to occur in three areas: cabling to a moving platform, sensitivity to ambient light, and overall cost effectiveness. Because of these reasons, none of these copiers have output sensing devices.