PRECOLLATION DOCUMENT HANDLER
Original Publication Date: 1982-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Two embodiments of document handlers are shown in the drawings for recirculating either simplex or duplex original document sheets for precollation copying in an electrophotographic printing machine. Referring to Figure 1, a stack of simplex originals are placed face down in document tray 10. Duplex originals are placed in document tray 10 with side one down. Document feeder 12 advances the bottommost document from tray 10, in the direction of arrow 18, under roller 16 between guides 20 and 22. Roller 24 advances the leading edge of the document exiting guides 20 and 22 into the nip defined by rollers 30 and 32. As the document exits roller 24, a fixed optical system directs light rays, indicated by arrow 28, 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 radiates the charged region of a photoconductive surface to form an electostatic latent image thereon. When the leading marginal region of a simplex document exits by rollers 26 and 28, it enters the nip defined by rollers 46 and 42. Roller 42 rotates in the direction of arrow 44 to advance the simplex document into IJ-shaped member 48. When the leading marginal region of a duplex document exits the nip defined by rollers 30 and 32, the leading marginal region of the document is secured to document drum 36. While rotating on document drum 36, the optical system directs light rays, as indicated by arrow 40, onto the other side of the document. The light rays reflected from the document are transmitted through a lens onto the charged photoconductive surface to form a latent image thereon. After being illuminated, the leading edge of the document is released and enters the nip between rollers 46 and 42. The duplex document, like the simplex document, enters U-shaped member 48.