Browse Prior Art Database

Original Publication Date: 1993-Jun-30
Included in the Prior Art Database: 2004-Apr-06

Publishing Venue

Xerox Disclosure Journal


Proposed is a bottom active retard paper feeder consisting of a nudger roll, a retard roll, a bail bar, and a slip clutch. As shown in the illustration, paper is driven from the bottom of a stack of paper 34, by virtue of the nudger roll 20 rotating in the direction of arrow 21, into the nip formed by feed roll 26 and retard roll 22. The normal force applied to the nudger roll 20 is provided by a bail bar 24. The feed roll 26 is driven in the paper feed direction indicated by arrow 27, while the retard roll 22 is driven actively in the reverse direction indicated by arrow 23, through a slip clutch (not shown) with a specified torque. The feedhetard mechanism drives multiple sheets 28 and 29 backward when more than one sheet of paper enters the nip allowing only the bottom most sheet 30 to pass through the nip. The ability of this device to perform this function lies in the frictional interface difference between paper to paper and paper to elastomer or retard roll 22.