Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A coin checking device for use in a coin handling machine for discriminating whether passing coins are genuine or counterfeit, said coin checking device comprising: detection coil means for detecting an initial voltage and sequentially issuing a detection signal in accordance with the material properties of each of the passing coins, receiving and generating means for receiving each detection signal from the detection coils and generating a variation value representing a maximum quantity of variation from said initial voltage for each detection signal,
Claim 2
Dependent Claim
83 words
A coin checking device for use in a coin handling machine for discriminating whether passing coins are genuine or counterfeit, said coin checking device comprising: detection coil means for detecting an initial voltage and sequentially issuing a detection signal in accordance with the material properties of each of the passing coins, receiving and generating means for receiving each detection signal from the detection coils and generating a variation value representing a maximum quantity of variation from said initial voltage for each detection signal,
Claim 3
Dependent Claim
103 words
storing means for storing each variation value, reading means for reading from the storing means at least two immediately preceding variation values and averaging said at least two immediately preceding variation values to obtain a renewable reference value prior to reading a new variation value from said storing means, first comparing means for comparing said renewable reference value with said new variation value to obtain a first difference therebetween, and second comparing means for comparing said first difference with an acceptable value to obtain a second difference and issue a different kind coin mixture signal when the second difference exceeds the first difference.
Claim 4
Dependent Claim
103 words
storing means for storing each variation value, reading means for reading from the storing means at least two immediately preceding variation values and averaging said at least two immediately preceding variation values to obtain a renewable reference value prior to reading a new variation value from said storing means, first comparing means for comparing said renewable reference value with said new variation value to obtain a first difference therebetween, and second comparing means for comparing said first difference with an acceptable value to obtain a second difference and issue a different kind coin mixture signal when the second difference exceeds the first difference.
Claim 5
Dependent Claim
51 words
A device as set forth in claim 1 wherein the detection coils comprise a transmitting coil for generating a voltage and a receiving coil for generating an induced voltage, these coils being mounted opposite to each other so that said coils are arranged on the opposite sides of the coin path.
Claim 6
Dependent Claim
45 words
A device as set forth in claim 1 wherein the detection signals issued from the detection coils are converted into d.c. voltages by a d.c. converter, converted from analog to digital form by an analog/digital converter and then transferred to the receiving and generating means.
Claim 7
Dependent Claim
33 words
A device as set forth in claim 1, further comprising a coin kind setting switch associated with the second comparing means for varying the acceptable value in accordance with the kinds of coins.