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:
Jan. 01, 1985
Filed:
Dec. 29, 1981
Tadashi Ikoma, Tokyo, JP;
Syozo Miyawaki, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An apparatus for discriminating a sheet transfer condition has two opposite rollers at least one of which has an axis of rotation which is movable toward and away from that of the other roller. The thickness of a sheet nipped between the two rollers is detected while the rollers are rotated, through a displacement of the movable roller. The thickness is computed utilizing a value provided by integrating, averaging, smoothing or other wise processing on a time series basis the displacement which occurs during a time period for which at least one of the rollers completes an integral number of rotations. The thickness is computed by subtracting a so processed value for a case wherein a sheet is absent between the rollers from a so processed value for a case wherein a sheet is present between the rollers. Where the rollers have a common diameter, the time period which they take to complete an integral number of rotations is employed as the aforesaid time period for an integral number of rotations. Where the diameters of the rollers differ from each other, the time period for a larger diameter roller to complete an integral number of rotations or the time period for both the rollers to complete their integral numbers of rotations is selected as the same time period concerned.