Toner purging development apparatus and a method of producing custom color on demand using same

A method of, and a 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 includes (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 and a charge having a first polarity; (b) a first set of devices for charging and transporting toner laden carrier particles within the sump; (c) a second set of devices for transporting the toner laden carrier particles through a development nip of the color reproduction machine, (d) toner purging apparatus for enabling clean and efficient changing of custom color on demand within the sump by removing the first quantity of toner particles having a first color from the sump, and allowing the loading into the sump of a second quantity of toner particles having a second and different color. The toner purging apparatus as shown is mounted adjacent the movable donor member and includes a corona generating device for detoning the charged toner laden carrier particles forming a first layer of toner particles and a second layer of detoned magnetic carrier particles on the surface of the donor member. The toner purging apparatus further is connected to (e) a controller that is connected to the toner purging apparatus and has a first control mode for controlling the toner purging development apparatus in a development mode, and a second control mode for controlling the toner purging development apparatus in a toner purging mode.