Extended development zone apparatus with rotating magnets

摘要

A magnetic brush development station for developing latent image charge patterns supported on a moving image support member of an electrostatographic reproduction apparatus. The magnetic brush development station includes a housing located in operative association with an extended run of the image support member. The housing has a portion constituting a sump for developer material, and a portion defining an opening facing the image support member. Further, the magnetic brush development station includes an applicator for applying developer material to a latent image charge pattern on the image support member to develop such latent image charge pattern. The applicator includes a sleeve located in the last mentioned portion of the housing, above the developer material sump, the sleeve having a development surface operatively associated with the image support member through the opening and configured to complementarily conform to the run of the image support member to define an extended uniform development zone. A plurality of rotatable magnets are located adjacent to the underside of the development surface of the sleeve to move developer material through the development zone.