Electrographic development apparatus having a mixing device with a ribbon blender.

摘要

An electrographic development apparatus has a sump (26; 68) for receiving developer material (28) including carrier particles and toner particles. A magnetic brush (16; 100) receives development material (28) from the sump (26; 68) and moves the material into a positon relative to an electrostatic image carried on an insulating surface so that toner particles can be transferred to the electrostatic image to develop such image. A ribbon blender (30; 70) in the sump (26; 68) mixes the toner and carrier particles of the developer material (28), circulates developer material axially within the sump (26; 68), agitates and shears the developer material, promotes tribochanging, and feeds developer out of the sump (26; 68) along the path leading to the magnetic brush (16; 100).