Device for detecting properties of sheets of paper or the like.

摘要

A device for detecting the degree of deterioration of bank notes has a driving rotary body (31) and a detection rotary body (33), which are a pair of oppositely disposed rollers each having alternately disposed enlarged diameter portions (31A; 33A) and annular grooves (31B; 33B). These enlarged portions and the grooves of the two rotary bodies are in staggered, opposed relationship so that when a bank note (P) is conveyed between the two rotary bodies, the note is deformed into a wave shape. The rotation of the driving rotary body (31) influences on the rotary movement of the detection rotary body (33) depending on the stiffness of the bank note in the wave shape. When the bank note is new and stiff, the influence is strong, while when the bank note is old and deteriorated with a small stiffness, the influence is small. Such influence is detected from variation in rotary movement of the detection rotary body (33) to which a predetermined rotational characteristic is given by a clutch device (39).