A developer system for developing an image in an electrophotographic
printing machine, including: a developer housing having a toner sump
containing developer material; a magnetic development member rotatably
mounted in the housing for transferring toner particles to a latent image
on the photoreceptive member in a development zone; a transport system
for transporting developer material from the toner sump to the magnetic
development member, the transport system includes: a mix/pump auger,
disposed in a first auger channel, for mixing and circulating developer
material along a first path within the first auger channel; a transport
auger, adjacent to the mix/pump auger and disposed in a second auger
channel, for circulating developer material along a second path within
the second auger channel; a wall member disposed in between the mix/pump
auger and the transport auger, the wall member having a first opening
disposed near an inboard end of the housing and a second opening disposed
near an outboard end of the housing, the first and second opening
providing a recirculating path between the first and second paths; a pick
up area define in the first path, the pick up area having a predefined
developer material volume; and a third opening in the wall member,
disposed adjacent to the pumping section associated with a pumping
section of the mix/pump auger, for providing a spillway from the first
path to the second path to allow excess developer material to be
recirculated when the developer material volume of the pick up area is
substantially full.