Browse Prior Art Database

METHOD OF CONTROLLING TONER CONCENTRATION IN DEVELOPER

IP.com Disclosure Number: IPCOM000023005D
Original Publication Date: 1976-Jun-30
Included in the Prior Art Database: 2004-Mar-27

Publishing Venue

Xerox Disclosure Journal

Abstract

It is possible to regulate the toner concentration of a developer in response to shear strength measurement, It has been found that as toner concentration increases the shear strength of the developer also increases; while in the presence of a magnetic field the developer shear strength decreases as the toner concentration increases, By monitor~ ing the change in shear strength, the toner concentration may be estimated, This may be accomplished in a magnetic brush development system by adding a torque transducer to the magnetic brush rolls, The output of the transducer may be fed into circuitry to control the toner dispensing rate in response to the torque, This method has an advantage over toner concentration measurement systems requiring a light source as it is not susceptible to contamination by dirt,