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:
Mar. 21, 1989
Filed:
Sep. 10, 1987
Douglas L Milne, Dundee, GB;
NCR Corporation, Dayton, OH (US);
Abstract
An apparatus for detecting the passage of superposed sheets along a feed path includes first and second cooperating rollers (12, 14), the second roller (14) being movable away from the first roller (12) in response to the passage of a single or multiple sheet between the rollers (12, 14). The first roller (12) has a diameter twice that of the second roller (14). Voltage generating means (42) produces an output voltage which varies linearly with movement of the axis of the second roller relative to the axis of the first roller (12). This voltage is integrated over one complete revolution of the first roller (12) first with no sheet present and then with a single or multiple sheet passing between the rollers (12, 14) to produce first and second values respectively. The first value is subtracted from the second value to produce a third value on the basis of which the number of sheets corresponding to the second value is determined.