Patent ID: 6751430
Filing Date: 2004-06-15
Classification: G03G

Abstract:
A color toner purging development apparatus for enabling clean and efficient accomplishment of custom color on demand imaging in a xerographic color machine using two component developer material, the toner purging development apparatus comprising:a. a development housing defining a sump holding two component developer material including carrier particles, and a first quantity of toner particles having a first color; b. first means mounted within said sump for triboelectrically charging said first quantity of toner particles to adhere to and laden said carrier particles, and for transporting said charged toner laden carrier particles within said sump; and c. second means mounted partially within said sump for receiving a layer of said charged toner laden carrier particles from said first means and for transporting the same through a development nip of a color reproduction machine, said second means including a movable donor member for forming the development nip with a latent image bearing member of the color reproduction machine; d. toner purging means for enabling clean and efficient custom color on demand from said sump by removing said first quantity of toner particles having a first color and allowing loading into said sump of a second quantity of toner particles having a second and different color, said toner purging means including a pick off roller mounted adjacent said movable donor member, a corona generating device for detoning said charged toner laden carrier particles to form a first layer of only toner particles on the surface of the donor member, and an auger device for removing only skived off toner particles out of said development housing; and e. a controller connected to said toner purging means and having a first control mode for controlling said toner purging development apparatus in a development mode, and a second control mode for controlling said toner purging development apparatus in a toner purging mode.