Abstract: Disclosed are various apparatus and methods for discriminating between fake and reject coins. The term ‘coin’ includes any type of monetary token or token that is associated with a value. Various different apparatus and methods are disclosed. These include a method and apparatus of applying multiple input currents of different frequencies to a coin and monitoring the apparent change in impedance of a coil or coils resulting from eddy currents induced in the layers of the coin from the multiple input currents. Other methods and apparatus relate to applying electromagnetic radiation to the coin and measuring various resulting characteristics including the amount of light fluoresced or reflected from the coin, or the absorption characteristic of the coin. Other methods and apparatus relate to measuring vibration of a coin. Other methods and apparatus relate to identifying genuine and bogus coins via particular identifying characteristics of the coins including magnetic codes/serial numbers.

Abstract: A coin cleaning device for separating foreign objects from a mass of coins, comprising first and second shelf portions arranged at first and second heights, vibration means for vibrating both the first and second shelf portions to cause coins on said shelf portions to be conveyed along said shelf portions, said shelf portions each being perforated by apertures of transverse dimensions smaller than a predetermined minimum diameter of coins to be handled by the device, whereby foreign matter of transverse dimensions smaller than the perforations can fall through said perforations, said first shelf portion having an upstream end and a downstream end, said second shelf portion having an upstream end and a downstream end, said shelf portions being arranged in series with one another whereby coins fall from said downstream end of said first shelf portion to tumble downwards to lie on said upstream end of said second shelf portion, and a coin outlet positioned beneath said downstream end of said second shelf portion

Abstract: A coin cleaning device for separating foreign objects from a mass of coins, comprising first and second shelf portions arranged at first and second heights, vibration means for vibrating both the first and second shelf portions to cause coins on said shelf portions to be conveyed along said shelf portions, said shelf portions each being perforated by apertures of transverse dimensions smaller than a predetermined minimum diameter of coins to be handled by the device, whereby foreign matter of transverse dimensions smaller than the perforations can fall through said perforations, said first shelf portion having an upstream end and a downstream end, said second shelf portion having an upstream end and a downstream end, said shelf portions being arranged in series with one another whereby coins fall from said downstream end of said first shelf portion to tumble downwards to lie on said upstream end of said second shelf portion, and a coin outlet positioned beneath said downstream end of said second shelf portion