Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Sorting paper money
Patent
1986-06-09
1988-06-07
Cherry, Johnny D.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Sorting paper money
209567, 324232, 382 7, B07C 5344, G06K 500
Patent
active
047490870
ABSTRACT:
A method for determining whether a test sheet, such as a banknote, is a genuine reproduction of a reference sheet having a magnetic characteristic such as being printed with a ferromagnetic ink. The method comprises sensing for a magnetic effect, such as a magnetic field, with a suitable detector (14) from a plurality of areas (A-D) of the test sheet. The sensed magnetic effects are compared from two different groups (B, D) of one or more of the areas; and the test sheet is classified as unacceptable if the relationship between the magnetic effects of the compared groups is not within limits previously determined as acceptable for the relationship between the magnetic effects of the same pair of groups of areas of the reference sheet.
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Cherry Johnny D.
De La Rue Systems Limited
Wacyra Edward M.
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