Low bead impulse donor loading

摘要

A toner delivery method and apparatus for delivering highly charged toner containing a minimum of wrong sign toner to a donor roll structure. The donor roll structure, in turn, delivers the toner to an image receiver or a DEP printhead structure. A magnetic brush is utilized for loading toner particles on the donor roll structure. A magnetic cleaning brush is provided for redistributing unused toner on the donor roll structure. The donor roll and magnetic brushes are positioned to form a cavity which is filled with developer material which prevents the formation of carrier bead chains.