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:
Apr. 21, 1998
Filed:
Feb. 10, 1997
Gregory V Bogoshian, Rochester, NY (US);
Raphael F Bov, Jr, Pittsford, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
In a xerographic development unit, particularly a unit for applying single-component magnetic toner such as used in MICR printing, the end of a donor roll which applies toner to the surface of a charge receptor is provided with a magnetic seal. The magnetic seal extends around at least a portion of the circumference of the roll, and defines a set of alternating magnetic poles arranged in bands which alternate along the length of the roll. The magnetic seal forms a uniform gap relative to the surface of the roll, the gap being sufficiently large to allow a turnover of toner particles therethrough. The design minimizes mechanical stresses on the toner, which in turn avoids the generation of frictional heat in the toner. A member defining magnetic poles can also be used as a shim for mounting a charge/metering blade within the development unit.