Apparatus for discriminating sheets
US4352988A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1980 |
| Grant date | Oct 5, 1982 |
| Priority date | — |
| Expiry date | Nov 14, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sheet discriminating apparatus comprises, in addition to a first detecting system for detecting light transmitted through a sheet and a second detecting system for detecting light reflected by the front surface of the sheet, a third detecting system for detecting light reflected by the rear surface of the sheet. The light doses sensed by these detecting systems are integrated by respective integrators for a predetermined period of time, and the outputs obtained from the integrators are coupled to an adder and added together therein. The sum output of the adder and a reference signal generator are compared with each other in a comparator, and the determination as to whether the sheet in question is adequate for re-use or not is effected on the basis of the result of the comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.