Patent ID: 9086648
Filing Date: 2015-07-21
Classification: G03G

Abstract:
1. A printing apparatus comprising: a container maintaining a toner/developer mixture; a toner concentration sensor operatively connected to said container, said toner concentration sensor outputting a toner concentration sensor response representing a concentration of toner particles within said toner/developer mixture; a donor roll receiving said toner particles from said container; a photoreceptor receiving said toner particles from said donor roll; an optical sensor positioned adjacent said photoreceptor, said optical sensor detecting an amount of said toner particles on said photoreceptor; and a processor operatively connected to said toner concentration sensor and said optical sensor, said processor generating a reload signal comprising an amount of said toner particles being reloaded on said donor roll from said container to replace portions of said toner particles removed from said donor roll in a printing process, said processor calculating said reload signal based on said amount of said toner particles on said photoreceptor detected by said optical sensor, said processor calculating a calibration sensor relationship between said toner concentration sensor response and said reload signal based on changes in said toner concentration sensor response and said reload signal that occur while changing said toner concentration during said printing process, and said processor calibrating said toner concentration sensor based on differences between said calibration sensor relationship and a previously established model relationship.