Browse Prior Art Database

GREEN COPIER WITH TWO DEVELOPERS

IP.com Disclosure Number: IPCOM000027696D
Original Publication Date: 1998-Oct-31
Included in the Prior Art Database: 2004-Apr-08
Document File: 4 page(s) / 223K

Publishing Venue

Xerox Disclosure Journal

Abstract

Referring to the figure, a xerographic copier incorporating a second black developer housing for utilizing waste toner as shown. The electrophotographic printing machine shown employs a photoconductive drum 16, although photoreceptors in the form of a belt are also known, and may be substituted therefor. The drum 16 has a photoconductive

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XEROX DISCLOSURE JOURNAL

GREEN COPIER WITH TWO DEVELOPERS

Edward P. Imes James G. Stenzel

Proposed Classification
U. S. CL 399/252 Int. C1. G03g 15/08

Referring to the figure, a xerographic copier incorporating a second black developer housing for utilizing waste toner as shown. The electrophotographic printing machine shown employs a photoconductive drum 16, although photoreceptors in the form of a belt are also known, and may be substituted therefor. The drum 16 has a photoconductive

XEROX DISCLOSURE JOURNAL - Vol. 23, No. 5 September/October 1998 259

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GREEN COPIER WITH TWO DEVELOPERS (CONT'D)

photoconductive surface deposited on a conductive substrate. Drum 16 moves in the direction of arrow 18 to advance successive portions thereof sequentially through the various processing stations disposed about the path of movement thereof. Motor 20 rotates drum 16 to advance drum 16 in the direction of arrow 18. Drum 16 is coupled to motor 20 by suitable means such as a drive.

Initially successive portions of drum 16 pass through charging station A. At charging station A, a corona generating device, indicated generally by the reference numeral 30, charges the drum 16 to a selectively high uniform electrical potential, preferably negative. Any suitable control, well known in the art, may be employed for controlling the corona generating device 30.

A document 34 to be reproduced is placed on a platen 22, located at imaging station B, where it is illuminated in known manner by a light source such as a tungsten halogen lamp
24. The document thus exposed is imaged onto the drum 16 by a system of mirrors 25 and lens 27, as shown. The optical image selectively discharges the surface 28 of the drum 16 in an image configuration whereby an electrostatic latent image 32 of the original document is recorded on the drum 16 at the imaging station B.

It should be appreciated that the printing machine may be a digital printing machine. In a digital printing machine a Remote Optical Scanner (ROS) may lay out the image in a series of horizontal scan lines with each line having a specific number of pixels per inch. The ROS may include a laser (not shown) having a rotating polygon mirror block associated therewith. The ROS exposes the photoconductive surface of the printer.

At development station C, a magnetic development system or unit, indicated generally by the reference numeral 36 advances developer materials into contact with the electrostatic latent images. Preferably, the magnetic developer unit includes a magnetic developer roller mounted in a housing. Thus, developer unit 36 contains a magnetic roller 40. The roller 40 advances toner particles into contact with the latent image. Appropriate developer biasing is may be accomplished via power supply 42, electrically connected to developer unit 36.

The developer unit 36 develops the charged image areas of the photoconductive surface. Th...