Limpness detector for documents and the like
US4365508A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 1, 1980 |
| Grant date | Dec 28, 1982 |
| Priority date | — |
| Expiry date | Aug 1, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N3/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A limpness detector for examining documents at high speed. A pair of rollers having star-like cross-sectional configurations comprised of substantially V-shaped projections and interspaced V-shaped grooves are cooperatively arranged so that the projections of one of said rollers at least partially enter into the grooves of the other. The rollers are rotated in a synchronous manner. One swingably mounted roller is preferably yieldably urged toward the other. Documents to be examined are fed between the rollers and, depending upon their relative limpness or stiffness, serve to "lift" the swingable roller such that the amount of displacement between the rollers is a function of document limpness. Sensor means is utilized to detect the amount of displacement. Threshold detection circuitry is provided to facilitate calssification of the documents into limp, moderately stiff and stiff documents, for example. The apparatus may also be utilized to detect the presence of overlapping and/or multiply-fed documents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.