Browse Prior Art Database

Original Publication Date: 1982-Dec-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


As shown in the drawing, the document handler recirculates either simplex or duplex original document sheets for precollation copying in an electrophotographic printing machine. Considering initially the handling of simplex originals, a stack of simplex originals are placed face down in document tray 10. Document feeder 14 advances the bottommost document from tray 10, in the direction of arrow 65, to the nip defined by rollers 18 and 20. Roller 18 rotates in the direction indicated by arrow 16 to advance the document to rollers 26 and 23. Roller 26 rotates in the direction of arrow 24. As the document passes between the two sets of rollers, i.e., set 13-20 and set 26-28, a fixed optical system directs light rays, indicated by arrow 22, onto successive incremental portions of the moving document. Light rays reflected from the document are directed through a lens to form a light image thereof which irradiates the charged region of a photoconductive surface to form an electrostatic latent image thereon. When the leading marginal region of the document exits rollers 26 and 28, it passes between guides 30 and 46 and over document drum 32 rotating in a direction of arrow 34. The leading marginal region of the document then advances into the nip defined by rollers 33 and 40. Roller 38 rotates in the direction indicated by arrow 36 to advance the document into U-shaped member 42. When the leading edge of the simplex document engages the back end of the U-shaped member 42, the trailing edge is lifted in an upwardly direction by roller 40 so as to be positioned in the nip of rollers 40 and 44. The document then passes over guide 46, between rollers 28 and 48, between rollers 20 and 50, between stop 54 and roller 52 returning the top of the stack of documents in tray 10, face down.