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. 30, 1991
Filed:
Apr. 25, 1989
Keiji Tsuji, Tokyo, JP;
Laurel Bank Machines Co., Ltd., Tokyo, JP;
Abstract
An apparatus for detecting the thickness of sheets by detecting displacement of one of a pair of rollers disposed so as to face each other across a transporting path of the sheets, the pair of the rollers being driven by a driving motor and including a reference roller rotatable about a fixed shaft and a movable roller abuttable against the reference roller and rotatably mounted on a movable shaft displaceable with respect to the reference roller, the apparatus further including a timing signal generator for generating timing signals synchronized with rotation of the reference roller and the movable roller, a displacement detector for detecting an amount of displacement of the movable roller by detecting an amount of displacement of the movable shaft in synchronism with the timing signals, a sheet detector for detecting whether or not the sheets are present at a portion where the reference roller and the movable roller face each other, a sheet thickness calculator for calculating the thickness of the sheet by deducting, in accordance with the timing signals, the amount of displacement of the movable roller detected by the displacement detector when the sheet detector does not detect any sheet at the portion where the reference roller and the movable roller face each other from the amount of displacement of the movable roller detected by the displacement detector when the sheet detector detects the sheet at the portion where the reference roller and the movable roller face each other. According to this apparatus for detecting the thickness of sheets, it is possible to detect the thickness of sheets with high accuracy and this apparatus is particularly suitable for detecting double feed of bills and bills counterfeited by use of adhesive tape.