Browse Prior Art Database

DOCTOR BLADE CONTROL

IP.com Disclosure Number: IPCOM000024445D
Original Publication Date: 1980-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 1 page(s) / 72K

Publishing Venue

Xerox Disclosure Journal

Abstract

To reduce microstreaking and fiber contamination in xerographic copying machines employing a retractable doctor blade to remove leftover toner fibers and other debris from the photoconductive surface prior to reuse, it is important to assure that the blade interface (i.e., the point at which the doctor blade contacts the photoconductive surface when extended) be kept in a relatively localized, if not constant, area.

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XEROX DISCLOSURE JOURNAL

DOCTOR BLADE CONTROL Edward de Jong
Daniel Mac Donald

Proposed Classification
U.S. Cl. 355/15
Int. Cl. G03g 21/00

To reduce microstreaking and fiber contamination in xerographic copying machines employing a retractable doctor blade to remove leftover toner fibers and other debris from the photoconductive surface prior to reuse, it is important to assure that the blade interface (i.e., the point at which the doctor blade contacts the photoconductive surface when extended) be kept in a relatively localized, if not constant, area.

In cases where the blade retraction system allows the pivoting doctor blade 10

engage the photoconductive surface of a xerographic drum as the drum is beginning to accelerate, rapid changes in edge loading-occur, promoting the formation of microstreaks on the photoconductive surface. When the machine drives are de- energized and power removed from the blade loading solenoid allowing the doctor blade to pivot away from the rotating drum surface, the inertia of the machine drives may allow the drum and the blade interface line to coast past the retracted blade. In this circumstance, as the blade lifts, the mound of toner, fibers and contaminants collected behind the blade tends to be carried underneath the blade by the coasting drum and past the blade into the normally clean area of the drum beyond the blade. As a result, fibers and contaminants may be left on the photoconductive surface opposite the blade so that on...