Xerox Corporation

Julie A Perez

Timothy R Jaskowiak

Daniel R Gilmore, Iii

Heiko Rommelmann

Kevin H Taft

Ann M Kazakos

Jay Lee Schneider

Thomas L DiGravio

Daniel L Coughlin, Jr

An electroded donor roll for mounting partially within a mixing chamber of a development unit for forming a development zone with an image bearing member and moving charged toner particles from the mixing chamber to the development zone. The donor roll includes a conductive shaft core and a dielectric material layer that is injection molded over the shaft core. The donor roll also includes axially extending electrodes formed in the surface of the dielectric layer, and robust commutator contact pads that are formed from a conductive commutator washer device which has been overmolded into the dielectric layer. The commutator pads each are in line with, and contact an axially extending electrode.

Electroded donor roll having robust commutator contacts

A development apparatus includes a housing defining a chamber holding a supply of two-component developer material including toner, and magnetizable carrier beads. The development apparatus also includes an increased reliability roller assembly within the housing for repeatably transporting a desired quantity of attracted developer material through a development zone. The roller assembly includes a first and a second preformed end cap sections each having a stub shaft portion and a cylindrical capping portion connected to the stub shaft portion and having an outer surface and assembly recesses formed into the outer surface. The roller assembly also includes a sleeve section connecting the first and the second preformed end cap sections, the sleeve section being spincast as a layer over each of the cylindrical capping portions, and into the assembly recesses of the end cap sections, so as to precisely and reliably assemble each capping portion, to the sleeve section.

Development apparatus having a spincast roll assembly

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Pittsford, NY, United States of America

Julie A Perez