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:
Nov. 17, 2015
Filed:
Nov. 10, 2014
Lexmark International, Inc., Lexington, KY (US);
Robert Dan Bennett, III, Paris, KY (US);
Gary Allen Denton, Lexington, KY (US);
Katherine Marie Gilliam, Lexington, KY (US);
Elliott Vincent Jernigan, Lexington, KY (US);
Matthew Lee Rogers, Lexington, KY (US);
Dominique Renee Rowe, Lexington, KY (US);
Daniel Enrique Alonzo, Manvel, TX (US);
Royden Thomas Kern, 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. An upper and a lower magnetically permeable metal shunt are positioned at each axial end of the magnetic roll. Each upper shunt and each lower shunt is positioned axially outboard of the core and in close proximity to the outer surface of the sleeve. A combination of the upper shunt and the lower shunt at each axial end of the magnetic roll surrounds greater than 180 degrees of the outer surface of the sleeve.