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. 11, 2011
Filed:
Sep. 29, 2008
Robert Reed Booth, Lexington, KY (US);
Ryan David Brockman, Lexington, KY (US);
Kerry Leland Embry, Midway, KY (US);
Paul Wesley Etter, Lexington, KY (US);
Claudia Alexandra Marin, Lexington, KY (US);
Travis Alan Riggs, Shelbyville, KY (US);
Robert Reed Booth, Lexington, KY (US);
Ryan David Brockman, Lexington, KY (US);
Kerry Leland Embry, Midway, KY (US);
Paul Wesley Etter, Lexington, KY (US);
Claudia Alexandra Marin, Lexington, KY (US);
Travis Alan Riggs, Shelbyville, KY (US);
Lexmark International, Inc., Lexington, KY (US);
Abstract
The present application is directed to methods of controlling the transfer voltage in a transfer nip formed between the photoconductive member and the transfer member. The methods offset the effects of large transfer current spikes caused when a media sheet enters and exits the transfer nip and account for temperature and humidity operating parameters using wet-bulb temperature measurements to adjust the transfer voltage. The control may include either ramping up or ramping down the transfer voltage. The ramped transfer voltage may include a series of alternating positive and negative steps that generally trend to ramp up or down. The size of the steps may further be adjusted to provide a smooth transition.