Patent ID: 7502580

Claim:
A two component development system for developing an electrostatic latent image on an imaging surface of an electrophotographic machine, comprising: a housing containing a supply of uncharged toner, said housing having an opening with two parallel opposing lips; a first rotatable dispensing roll positioned in said housing opening and in contact with said supply of toner, the first dispensing roll being parallel to said housing lips; a metering blade mounted on one of said housing lips and in contact with said first dispensing roll, said metering blade being arranged for metering a layer of uncharged toner onto said first dispensing roll; a rotatable magnetic brush having magnetic, conductive or semi-conductive carrier beads thereon, said carrier beads being in contact with said layer of toner on said first dispensing roll, and said magnetic brush having a length substantially equal to the width of said imaging surface; a first ion or electron charging device confronting said first dispensing roll and being positioned between said housing and said magnetic brush and downstream from said metering blade for placing an ion or electron charge on said layer of toner on said first dispensing roll prior to contact of said layer of toner with said magnetic brush; a voltage source being connected to said magnetic brush for assisting in the transfer of the ion or electron charged toner from said first dispensing roll onto the carrier beads of said magnetic brush to form a layer of two component developer on said magnetic brush; and said magnetic brush being rotated toward a development zone where an electrostatic latent image recorded on a moving imaging surface is developed.