JPS6180491A - Coin inspector - 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 Field of the Invention The present invention relates to a coin inspection device used in a coin sorting device such as a vending machine or a money changer.

Prior art Conventionally, lI! using an oscillating coil and a receiving coil. I! For example, the cargo inspection device is disclosed in Japanese Patent Publication No. 57-35510,
Special Publication No. 57-35511, Special Publication No. 55-1799
Publication No. 8, Special Publication No. 54-262008, Special Publication No. 55
-15756, Japanese Patent Publication No. 57-557, Japanese Utility Model Publication No. 55-17257, etc. are already known. However, in these conventional techniques, even if it is possible to detect differences in the material and diameter of the coin, it is very difficult to detect the difference in the uneven pattern between the center of the coin and its periphery. Figures 2-a and 2-b show an example of such a conventionally known coin inspection device, and Figure 2-a shows a coin inspection device 2 for detecting the material of a coin. Two receiving coils 2b and 2c are arranged facing each other between the coin passages formed between the side plates P+ and P2, and the center point of the oscillating coil 2a is placed at a position through which the center of the coin to be inspected passes. The center point of the coil 2a is the center point of the two receiving coils 2.
b.

It was arranged to coincide with the center point between 20.

Fig. 2-b shows a coin inspection device 3 for detecting the diameter of a coin, in which an oscillating coil 3a and two receiving coils 3b, 3c are arranged facing each other on both sides of the coin passage 1, and two receiving coils 3b and 3c are arranged facing each other. The middle four points of the receiving coils 3b and 3c were aligned with the center point of the oscillating coil 3a, and the receiving coils were arranged at a position through which the periphery of the coin to be inspected passed. And Figures 2-a and 2-b
Coin inspection devices 2.3 shown in the figure are arranged upstream and downstream of the coin passage 1, and the oscillation coil 2a of the coin inspection device 2 for inspecting the material is supplied with a low frequency of about 25KH7, and the coin inspection device for inspecting the diameter A high frequency of about 100 KHz is applied to the oscillating coil 3a of No. 3, and when a coin passes through, the material and diameter of the coin are inspected and determined based on the peak value of the voltage waveform obtained from each receiving coil 2t+, 2c, 3b, and 3c. They used these methods to determine nine types of coins: genuine and false. However, it is very difficult to sort out two or more coins that have almost the same diameter, are made of almost the same material, and differ only by the uneven pattern on the surface of the coin or the presence or absence of holes. , 2c
, 3b, and 3c, the voltage waveforms were almost the same and could not be separated.

Problems to be Solved by the Invention The present invention improves the above-mentioned drawbacks of the prior art, and improves the uneven pattern even for two or more coins where the only difference is the uneven pattern on the surface of the coin or the presence or absence of holes. This allows coins to be sorted by whether they have holes or not.

Means for solving the problem: An oscillating coil is placed on one side of the coin passage, and a receiving coil is placed opposite the oscillating coil on the other side, and the coins passing through the coin passage are inspected to determine whether they are genuine or fake. In order to detect and distinguish coins that differ only by the uneven pattern on the coin surface or the presence or absence of holes, we conducted various experiments using a coin inspection device that detects the material of conventional coins. 2-a
It was discovered that if the center point of the oscillating coil and the midpoint of the two receiving coils are offset from each other in the case shown in Fig.), even this type of coin inspection device can determine whether there are uneven patterns or holes, and the present invention is based on this. Initially, ′f passes through the oscillation coil.
7f! The center point of the oscillating coil and the middle point between the two receiving coils are placed at a position where the center of the coin passes through, and two receiving coils connected in series with opposite phases are placed opposite the oscillating coil across the coin passage. The above problem was solved by slightly shifting the arrangement.

Effect: When a low frequency is applied to the oscillation coil and a coin is caused to flow down the coin path, voltage waveforms with different peak voltages are generated in the two receiving coils, depending on the coin's material, uneven pattern, and presence or absence of holes. From this voltage waveform, it is possible to determine the type of coin and whether it is genuine or false.

Embodiment FIG. 1 is a cross-sectional view showing an embodiment of the present invention. Reference numeral 1 indicates a coin passage, and the coin passage 1 is formed by side plates P+, P2, and a bottom plate P3. The bottom plate P3 is made of a non-permeable material, and the coin passage 1 is inclined so that coins fall down the coin passage according to the inclined bottom plate P3.

Reference numeral 4a denotes an oscillation coil arranged on one side of the inclined coin passage 1, and is arranged in accordance with the coin to be inspected so that the magnetic flux density is maximum at the center of the passing coin to be inspected. 4
b and 4c are receiving coils disposed on the other side of the coin passage 1; the receiving coil 4b;

40 and the center point of the oscillating coil 4a are offset from each other, and one of the receiving coils 4b (4c)
is arranged so as to be located within approximately the radius of the coin to be inspected from the other receiving coil 4c (4b), and the position of the coil 4b (4C) is approximately within the radius of the coin to be inspected from the coil 4c (4b). If it is within the range of , coil 4c (4b
) may be in any direction within 360 degrees.

The receiving coils 4b and 4c are formed by connecting substantially the same coils in series with opposite phases.

Receiving coil 4b of oscillating coil 4 as described above.

As shown in FIG. 3, the oscillating coil 4a is connected to an oscillator, and the receiving coils 4b and 4c are connected to a discrimination circuit 7 via an amplifier circuit 6, as in the conventional example. The discrimination circuit 7 also uses the receiving coils 4b, 4 as in the conventional example.
The test coil is determined by detecting the voltage level of the waveform detected in step c.

When the oscillator 5 is caused to oscillate at a frequency of about 25 Kl-1z and the oscillating coil 4a is excited, the receiving coil 4b is activated.

4C has almost the same coils connected in series, so the output from the receiving coils 4b and 4c is normally balanced and the output from the receiving coils 4b and 4c is r.
This is O.J. However, the coin that fell down coin passage 1 was inspected! When passing through position A, this equilibrium state collapses and the voltage generated at the output terminals of the receiving coils 4b, 4c is amplified by the amplifier circuit 6 and input to the discrimination circuit 7, but this receiving coil 4b.

The measured voltage generated at the output terminal of 4C varies depending on the magnetic permeability, shape, and pattern of the material of the passing coin, and this is discriminated by the discrimination circuit 7 to discriminate whether it is a genuine coin, a counterfeit coin, or the type of coin. Compared to conventional coin inspection devices of this type, the coin inspection device of the present invention not only measures voltage levels that vary depending on the material of the coin, but also detects irregularities on the coin surface that are difficult to detect with conventional coin inspection devices. It has become easier to detect differences in patterns and the presence or absence of holes. In particular, it has become very easy to detect the difference between the presence and absence of holes. Figure 4 shows the measured voltage waveforms (
output of the amplifier circuit 6), and the waveform W1 represents a coin with a hole,
The waveform W2 is the waveform of a coin without a hole. In a coin inspection device made of conventional materials, both waveforms W+ and W2 are almost the same, and the discrimination is different.However, by shifting the center point of the excavation coil 4a and the midpoint of the receiving coils 4b, 4c, it is possible to detect holes like this. It became possible to noticeably detect differences between the two. In addition, Figure 5 shows the measured waveforms W of two coins with approximately the same material and outer diameter, but different uneven patterns on the coin surface.
3. In this case, almost the same waveform was obtained using the conventional coin inspection device, but as shown in FIG. 5, the peak voltage of the waveform was different, making it easier to distinguish. If the coin inspection device of the present invention is used in place of the conventional coin inspection device shown in Fig. 2-a and used together with the coin inspection device for inspecting the outer diameter of the coin shown in Fig. 2-a, the coin It is possible to distinguish and detect the material, outer diameter, uneven pattern on the coin surface, presence or absence of holes, etc.

Effects of the Invention The present invention inspects the material of coins by simply arranging an oscillating coil and a receiving coil for inspecting the material of a coin by shifting the center point of the oscillating coil and the midpoint between the two receiving coils. It is possible to construct an extremely large number of coins, which is the same, and can also distinguish the uneven pattern on the surface of the coin and the presence or absence of holes, and with a simple structure, it is possible to easily distinguish distinctions that were previously impossible.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the arrangement of an excavation coil and a receiving coil of a coin inspection device according to an embodiment of the present invention, and Figs. ! Fig. 3 is a block diagram of an embodiment of the present invention, and Fig. 4 is a block diagram of an embodiment of the present invention, with almost the same material and outer diameter, but differences in the presence or absence of holes. A diagram showing the detection waveforms of two coins, Figure 5, shows that the materials and outer diameters are almost the same and &I! The figure which shows the detection waveform of two coins with different uneven|corrugated patterns on the surface of a coin. 1... Coin passage, 4a... Oscillation coil, 4b,
4c... Receiving coil, Pl, 'P2... Side plate, P3
···Bottom plate. Figure 2-a Figure 2b Figure 3 Figure 5 Procedures Amendment February 6, 1985

Claims (1)

[Claims] In a coin inspection device comprising an oscillating coil on one side of a coin passage and a receiving coil facing the oscillating coil on the other side, a position where the center of a coin to be inspected passing through the coin passage passes. The oscillation coil is arranged in
A coin inspection device characterized in that the middle point of the two coils and the center point of the oscillation coil are shifted from each other.