| 摘要 |
<p>The present invention provides a single coin acceptor or rejector for use with coin-operated machines, which has an oscillator circuit and a sensing coil, wherein the oscillator oscillates at a constant amplitude, and has sufficient gain that it will continue to oscillate at such constant amplitude when a coin is placed within the sensing coil. A field effect transistor (F.E.T.) which is utilized in the circuit becomes in effect a variable resistor, the value of which is controllable by materials passing through the sensing coil. Such effective resistance changes are detected by a resistor connected in series with the F.E.T. and which functions as a current to voltage converter. By two pairs of comparators and associated circuitry an opto isolator is activated if the output of one comparator of the second pair goes high while the output of the other comparator of the same pair remains low; and when activated the opto isolator triggers a triac which, in turn, activates the accept armature of an accept solenoid. Non-genuine coins do not activate the opto isolator and, in turn, the triac, and such coins are rejected. The coin acceptor or rejector apparatus has a flapper with a flange at its lower end disposed in a slot in the coin chute, said flapper being movable by a solenoid out of said slot to accept genuine coins, and when in the slot to direct non-genuine coins to rejection.</p> |
