The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 06, 2015
Filed:
Sep. 30, 2014
Lexmark International, Inc., Lexington, KY (US);
Gary Allen Denton, Lexington, KY (US);
Katherine Marie Gilliam, Lexington, KY (US);
Matthew Lee Rogers, Lexington, KY (US);
Dominique Renee Rowe, Lexington, KY (US);
Lexmark International, Inc., Lexington, KY (US);
Abstract
A developer unit according to one example embodiment includes a housing having a reservoir for storing a developer mix that includes toner and magnetic carrier beads. A magnetic roll includes a stationary core and a sleeve positioned around the core that is rotatable relative to the core. The stationary core includes at least one permanent magnet having circumferentially spaced magnetic poles. At least one external shunt is composed of a magnetically permeable metal and is positioned at each axial end of the magnetic roll axially outboard of the core and in close proximity to the outer surface of the sleeve along a first circumferential portion of the core. At least one internal shunt is positioned at each axial end of the core inside of the sleeve. Each internal shunt has a shunt portion composed of a magnetically permeable metal and positioned along a second circumferential portion of the core.