Extended development zone apparatus with rotating magnets

A magnetic brush development station for developing latent image charge patterns, supported on a moving image support member of an electrostatographic reproduction apparatus, with developer material including toner particles and carrier particles, said magnetic brush development station comprising:

• a housing located in operative association with an extended run of said image support member, said housing having a first portion constituting a sump for said developer material, and a second portion defining an opening facing said image support member;
• and
• an applicator for applying developer material to a latent image charge pattern on said image support member to develop such latent image charge pattern, said applicator including a fixed sleeve located in said second portion of said housing, above said developer material sump, said fixed sleeve having a development surface operatively associated with said image support member through said opening and configured to complementarily conform to said run of said image support member, even when said image support member is non-planar, to define an extended uniform development zone, and a plurality of rotatable magnets adjacent to the underside of said development surface of said fixed sleeve for forming elongated chains of developer material, and a motor for rotating said magnets so as to move said developer material chains through said development zone by causing said developer material chains to repeatably flip in the development zone.