A 3-shaft agitation method is adopted in this machine.
With three transport augers [D] [F] [G], toner that is transferred from the sub-hopper to the development unit is mixed into the developer, and then the mixed toner is transferred to the development sleeve [C]. The amount of mixed toner and developer on the development sleeve is regulated by the doctor blade, and the mixed toner and developer attaches to the surface of the drum.
If too much developer is supplied, excess developer is discharged by the developer collection coil [A].
The TD sensor [E] under the left transport auger [F] detects toner density.