Coin acceptor with device to test the hardness

摘要

A coin checking system tests on the basis of material hardness to detect if the coil is authentic. A piezo electric sensor [5] is mounted on a steel block at the end of a leaf spring supported as a cantilever [10]. A contact element [4] is formed on the tip of the sensor and this is positioned to project through an aperture in a coin guide track. Coins are rolled along the inclined track and in doing so strike the contact element. The signal from the sensor is amplified and is in the form of a transient with the amplitude being indicative of the material.