| 摘要 |
<p>The coin testing apparatus includes a first optical device (18, 20) positioned in predetermined spaced relationship with a ramp (16) along which the coin is constrained to roll after it is fed through an infeed slot (11). The first optical device detects a first parameter and produces a first signal of predetermined timed duration. A second optical device (23, 24) is positioned adjacent one side of the track or ramp (16) to measure the reflectivity of the coin and produce an output signal for a coin having the proper first and second parameters. The output signal energizes a device (27) which detains coins having an improper third parameter until expiration of the timed duration of the first signal. A reject mechanism (28) is operative to reject improper coins. A third optical device (31, 32) is positioned in the path of coins leaving the ramp (16) and is connected with a reset (32, 35, 41) to disable the apparatus for a predetermined time when an attempt is made to withdraw a coin back through the apparatus in a reverse direction past the third optical device. A coin detecting device (33, 34) is positioned in the path of a coin passing all of the tests to produce a ''vend'' signal.</p> |
