Coin discriminating apparatus
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United States of America Patent
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Sep 14, 1982
Issued Date -
N/A
app pub date -
Sep 12, 1979
filing date -
Feb 23, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A coin discriminating apparatus comprises two coils on opposite sides of a path for coins, one coil being connected to a signal generator so as to give repetitive abrupt flux changes and a gating device being provided for short circuiting the other coil but removing the short circuit a predetermined time delay after each flux change. A circuit is responsive to the amplitude of a voltage pulse which is produced across said other coil in response to each removal of the short circuit to discriminate between coins. This apparatus may form the second test of a two-test coin discriminating apparatus, wherein the first test measures a phase displacement caused by the coin passing between another pair of coils and this measurement is used to set the time delay to one of selected values, according to the expected coin, so that the voltage pulse will be of a constant amplitude for valid coins.
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