Browse Prior Art Database

DOCTORING OF LIQUID DEVELOPER DISPENSING MEMBER IN XEROGRAPHIC APPARATUS

IP.com Disclosure Number: IPCOM000023862D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 400K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates to the doctoring of liquid developer dispensing members used in xerographic apparatus and methods of the type described in detail in U.S. Patent 3,084,043. In this type of system referred to as polar liquid development, an

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XEROX DISCLOSURE JOURNAL

DOCTORING OF LIQUID DEVELOPER Proposed Classification DISPENSING MEMBE~JNXEROG1~~HIC U~S~CL 353/10

APP~~TUS mt CI. G03g 13/10 3ohn B. Wells

This disclosure relates to the doctoring of liquid developer dispensing members used in xerographic apparatus and methods of the type described in detail in U.S. Patent 3,084,043. In this type of system referred to as polar liquid development, an

electrostatic latent image is developed or made visible by presenting to the imaging surface a liquid developer on the surface of a liquid developer dispensing

member having a plurality of raised portions defining a substantially regular patterned surface and a plurality of portions depressed below the raised portions.

The depressed portions contain a layer of conductive liquid developer which is maintained out of contact with the electrostatographic imaging surface. When the raised areas of the developer applicator are brought into contact with an

electrostatic latent image-bearing surface, the developer creeps up the sides of the raised areas in contact only with the charged area of the imaging surface and is

deposited thereon in image configuration. The outer surface of the dispensing member generally has a pattern of closely spaced grooves, embossments, recesses

or pockets which are similar to the gravure members used in the printing industry, The conductive liquid developers used in this system are well known in the art.

In most instances, doctoring of the patterned liquid developer dispensing member is critical for the achievement of a delicate balance between the dispensing of too much or too little liquid developer. In accordance with the present disclosure, the doctoring of the conductive liquid developer may be improved by placing an electrical field across the doctor blade so the blade performs a dual function of mechanical doctoring of the liquid developer dispensing member and the

electrophoretic migration of particles in the liquid developer in those embodiments where the particular conductive liquid developer being used can resp...