Trim bar entry geometry for a dual component development electrophotographic image forming device

US9280094B1 · kind B1 · utility

Assignee

• Lexmark International, Inc. · US

Inventors

• Michael Brian Bacelieri · Lexington, US
• Robert Dan Bennett, III · Paris, US
• Gary Allen Denton · Lexington, US
• Katherine Marie Gilliam · Lexington, US
• Elliott Vincent Jernigan · Indian Trail, US
• Matthew Lee Rogers · Los Gatos, US
• Dominique Renee Rowe · Lexington, US
• Courtney Harrison Soale · Lexington, US

Key dates

• Filing date: Feb 10, 2015
• Grant date: Mar 8, 2016
• Expiry date: Feb 10, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G15/0891
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A developer unit for a dual component development electrophotographic image forming device according to one example embodiment includes a housing having a reservoir for storing a developer mix that includes toner and magnetic carrier beads. An auger is positioned to convey developer mix in the reservoir toward the outer surface of a magnetic roll on a front of the housing. A ledge on an inner surface of the housing extends axially with respect to the magnetic roll along a front of the reservoir. The ledge is positioned upstream from a trim bar and downstream from a pickup pole of the magnetic roll with respect to the operative rotational direction of the magnetic roll. The ledge has a concave curved inner surface that is open to the reservoir and extends from near the trim bar to near a front side of the auger.