JPS5894085A - Coin type discriminator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coin type discrimination device that discriminates the type of coin based on the material of the coin.

Conventional coin type discrimination devices make use of the fact that the material of each coin differs depending on the type of coin, as well as its magnetic permeability.The device resonates with the oscillation pulse output from the oscillation circuit and changes depending on the material of the coin that passes through the discrimination section. The type of coin is determined by integrating the resonance pulse and comparing the obtained DC level signal with a predetermined reference level.

However, since the 5K system detects the passing of a coin through the discrimination section and compares the coin at that point, a sensor is required to detect the longest diameter part of the moving coin, and it also requires sensitivity when passing at high speed. The drawback is that a sharp and expensive sensor must be used. In addition, to detect the longest diameter part of a passing coin, the waveform of the DC level signal is detected, the time from the rise of the signal to the time corresponding to the peak value is measured, and the levels are compared when the peak passes. You may do so. However, even if a predetermined time is measured from the rise of the DC level signal, the voltage at the time of peak passage changes depending on the speed at which the coin passes and the diameter of the coin, so there is a drawback that the type of coin cannot be accurately determined.

Therefore, this invention was made to eliminate the above-mentioned drawbacks, and provides a coin that can accurately determine the type of coin with a simpler structure without the need for a sensor to detect passage of coins or time measurement. The purpose is to provide a type discrimination device.

This invention, which will be explained below, relates to a coin detection and discrimination device, and as shown in FIG.
When the pulse signal PS is converted in response to the material of the coin passing through the discrimination section 21, the material detection signal M obtained from K is obtained.
A material discrimination device 2 that outputs the signal D, an integration circuit 3 that integrates the material detection signal MD and outputs a direct current level integral signal INF, and an integral signal INF that is output to the comparators CMI and CM2.
a comparison circuit 4 that outputs comparison signals CM81 and 0M82 by comparing them with reference signals RFI and RF2, respectively; a logic circuit 5 that outputs a discrimination signal DT from the AND of comparison signals CM81 and CMS2; and a pulse width of the discrimination signal DT. , and a comparison circuit 7 which compares the integrated signal ISS with a reference signal RF3 by a comparator CM3 and outputs a denomination signal MS. Therefore, the oscillation circuit 1 includes an operational amplifier Ql,
It is controlled by a capacitor C1 and others, and an amplifying transistor Q2 is connected to its output section. In addition, the discrimination section 21 of the material discrimination device 2 includes a material sensor ρ, which is equipped with a pair of windings, through which a coin passes.
is provided, and the output of the material sensors is connected to an operational amplifier Q.
It is amplified by an amplifier consisting of 3 and others, and is output as a material detection signal MD.

Furthermore, the integrator circuits 3 and 6 each have a resistor R11°R1
3 and capacitors C4 and C5, the logic circuit 5
is composed of an operational amplifier Q4 and a resistor KR12, and the reference signals RFI to RF3 of the comparators CMI to Q8 are provided by adjustment of the variable resistors V)t2 to V, respectively.

In such a configuration, the oscillation circuit 1 oscillates a pulse at a predetermined frequency, which is amplified by the transistor Q2 and then applied as a pulse signal PS to one winding of the material sensor n, and the other winding facing the material is inductively excited. The AC level signal generated by this is amplified by an amplifier and output as a material detection signal MD. However, when a coin does not pass between the material sensors n, the material detection signal MD is an alternating current signal as shown in Figure 2 I (at a constant level, but when a coin passes, it changes depending on the material. As the magnetic flux density changes, the material detection signal MD is an alternating current signal and changes in level as shown in ■ to V in the figure.The degree of this level change corresponds to the magnetic permeability of the coin material (for example, Fe, Cu). Therefore, by detecting this level difference when coins pass, it is possible to determine the type of coin.In addition, the characteristic (2) in FIG. 2 is CuN.

Characteristic (2) shows the response of Pb (lead), characteristic (2) shows the response of Ai (aluminum), and characteristic V shows the response of Fe (iron). It is clear that the level changes depending on the material.

Therefore, the material detection signal MD obtained by the level change of the current change signal is integrated by the integrating circuit (filter) 3,
When that AC component is removed, only the envelope line remains,
The integral signal ISF has, for example, characteristics A and H in FIG. The integral signal ISF obtained in this way is input to the comparators CMt and CM2 of the comparison circuit 4 in the next stage, and is compared with the reference signal ζ and RF2, and the comparison signal (J, 8
In this case, characteristics A and B can be determined by setting the reference signals LFI and mS as shown in FIG. That is, the reference signal 1 (
Fl is made smaller than the peak value of characteristic A, and the reference signal) t
F2 is set between the peak values of characteristics A and B.

Therefore, if a coin of 2ai@ is detected by the material sensor and an integral signal I8F as shown in FIG. 4 (5) is output, the comparison time w! comparator CM in r4
The output CM81 of I is the reference signal RJ as shown in the same figure (B).
The output CM82 of the comparator CM2 is converted into a binary value based on the magnitude of the level relative to 1, and the output CM82 of the comparator CM2 is the reference signal RF as shown in q.
It is binarized based on the level relative to 2.

Comparison signals CM81 and 0M82 obtained in this way
is input to operational amplifier Q41c in logic circuit 5 and becomes D'
l' = 0M81・CM82 ・・・・・・
...(1) is output according to the logical product operation, so
The output DT is as shown in FIG. 4 (to). The discrimination signal DT from the logic circuit 5 is input to the next-stage integration circuit 6, where it is integrated at a level corresponding to the pulse width of the discrimination signal DT, as shown in FIG. Therefore, if the reference signal RF3 of the comparator circuit 7 is set as shown in FIG. F') can be obtained. Based on this, the type of coin can be determined.

tc Oh, here we have described an example of discrimination for 2fil type coins, but it is also possible to similarly discriminate many types of coins in a balanced manner. In this case, the comparison circuit 4. Logic circuit 5. The coin type discriminating device of the present invention has a plurality of rows of integrating circuits 6 and comparing circuits 7 corresponding to the coin types, and sets the levels of the reference signals of the comparing circuits 4 and 7 according to the above-mentioned principle. It is possible to accurately determine the type of coin with a simple configuration, without requiring a sensor to detect passage or time measurement.

In addition, in the above, the logic circuit 5 is replaced by the arithmetic amplifier Q4 and the resistor R.
12, but an AND gate with negative entry may also be used. Further, the other circuits are not limited to the configuration shown in FIG. 1, and can be modified in various ways according to the above-described discrimination principle.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention, FIGS. 2 and 3 are diagrams for explaining the detection principle of the present invention,
FIGS. 4(5) to 4(F') are time charts showing an example of the detection operation of the present invention. 1... Oscillation circuit, 2... Material discrimination device, 3, 6...
・Integrator circuit, 4, 7... Comparison circuit, 5... Logic circuit diagram l Figure) 4 mouths

Claims (1)

[Claims] an oscillation circuit that outputs a pulse signal of a predetermined frequency; a material discrimination device that outputs a material detection signal obtained by converting the pulse signal in response to the material of the passing coin; and a material discrimination device that integrates the material detection signal. a first integrating circuit that outputs a first integrated signal at a DC level; and a first integrating circuit that compares the first integrated signal with first and second reference signals, respectively, and outputs first and second comparison signals. 1 comparison circuit; and the first comparison circuit.
and a logic circuit that outputs a discrimination signal from the AND of the second ratio II2 signal; a second integration circuit that obtains a second integral signal having a level corresponding to the pulse width of the discrimination signal;
a second comparison circuit that compares the integral signal of the above signal with a third reference signal and outputs a denomination signal.