FORFARANDE FOR BESTEMNING AV FORSLITNINGSGRADEN HOS SEDLAR OCH ANORDNING FOR GENOMFORANDE AV FORFARANDET

摘要

A method of determining the degree of wear of bank-notes 1, in which testing is carried out along edge 2 with a photodiode row 30 arranged perpendicular to the direction of transport. Depending on the skew of the note, whichever photodiode of the row completely covering the edge of the note is used for testing. The selection of a diode and the testing are independent of each other and are carried out along predetermined sections of the bank-note edge, controlled by a pulse coupled with the movement of the note. The photodiode ascertained during a selection section 4 is maintained during the entire following test section 3, so that testing is not affected by disturbing changes of the measuring diode. Selection sections 4 can be selected so as to be so short that the test sections 3 succeed each other practically continuously.