Original Publication Date: 1982-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Optoelectronic sensors are preferred over switches to detect documents in the paper paths of copiers and duplicators. The main advantage of these sensors is that they can detect documents without contacting them. Switches are especially a problem with lightweight papers because the paper can be misregistered, slowed down, and even damaged. Another advantage of opt0 sensors is their fast speed of response which allows a document's position to be more precisely known.