Automatic coin checking system - uses capacitive and/or inductive sensors generating signals compared with reference values relating to size, denomination and material

摘要

Automatic checking of coins of various denominations is made by a collector or sensors, and the basis of size, form and material. The coins are fed past a number of electronic, capacitive and/or inductive sensors. The sensors respond to cause changes in phase, amplitude or frequency of signals. The signals are compared with predetermined reference values. The generated signals are checked in a logic circuit to indicate either acceptance or reflection. The coins to be checked are also passed through the light beams directed at opto-electronic sensors which are arranged to give accurate measurements of size and surface condition.