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. 21, 2013
Filed:
Nov. 03, 2011
Applicant:
Marehiko Hirajima, Chigasaki, JP;
Inventor:
Marehiko Hirajima, Chigasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B65H 1/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a sheet feeding cassette which lifts up and lifts down a bottom plate each time when a paper is fed, a recording material sensor detects that no recording materials exist when the bottom plate rises over a predetermined position. Accordingly, by measuring a period of time when it is detected that no recording materials exist during a sheet feeding operation, a stacking amount of the recording materials in a sheet feeding cassette can be detected.