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:
May. 29, 2012
Filed:
Feb. 08, 2011
Hideo Izawa, Narashino, JP;
Yasushi Katagiri, Narashino, JP;
Osamu Ebuchi, Narashino, JP;
Miyakoshi Printing Machinery Co., Ltd., Narashino-shi, JP;
Abstract
A method of correcting print images in an electrophotographic printer wherein an image formed by a print head () on a peripheral surface of a photoconductor drum () is transferred and printed on a sheet of paper. The method comprises: furnishing the print head with a standard tacho signal in the form of pulses and thereby printing on a sheet of paper a check mark () for each given number of pulses of the standard tacho signal while the photoconductor drum makes one rotation; by means of a camera (), detecting a periodic deviation in each spacing between successive such check marks; in response to the deviation in each spacing between the successive check marks, varying the pulse width of pulses of the standard tacho signal for each spacing between the successive check marks, thereby to provide a modified tacho signal; and effecting printing thereafter based on the modified tacho signal.