JPS6248879B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a coin sorting device, and in particular is aimed at improving the sorting performance of a coin sorting device that sorts multiple types of coins.

[Prior Art] A conventional coin sorting device for sorting multiple types of coins includes a device installed in a coin passageway to mechanically sort coin types based on the size, shape, etc. of the coins. (See Japanese Unexamined Patent Application Publication No. 1985-8594).

However, in such a coin sorting device, since a bridge circuit for sorting is provided for each coin,
The configuration is complicated, especially when adjusting the balance point in the bridge circuit, the voltage and phase cannot be adjusted independently, and the adjustment work is not easy for each coin, and furthermore, the accuracy of sorting is difficult. There are problems in terms of machine life.

[Problems to be Solved by the Invention] The purpose of the present invention is to eliminate the above-mentioned drawbacks, utilize the selection accuracy using a bridge circuit, and provide an advanced selection function in which voltage and phase adjustment can be performed independently. An object of the present invention is to provide an electronic coin sorting device having the following features.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a coin sorting device that sorts input coins of a plurality of types, and a sorting coil for sorting a plurality of types of coins. The bridge circuit that incorporates the above and the reference voltage range are set for each type of coin, and the output voltage obtained from the bridge circuit when a coin is inserted is compared with the reference voltage range, and the output voltage is set only when the output voltage is within the reference voltage range. A plurality of voltage comparison circuits each output a voltage discrimination signal, and a reference phase range is set for each of the plurality of coin types, and the phase of the bridge circuit drive signal obtained from the bridge circuit when a coin is inserted is compared with the reference phase range. A plurality of phase comparison circuits each output a phase discrimination signal only when the voltage is within a reference phase range, and a voltage discrimination signal and a phase discrimination signal are output from both the voltage comparison circuit and the phase comparison circuit for each of the plurality of types of coins. The present invention is characterized in that it includes a determining means that determines that the coin is a genuine coin only when the coin is obtained.

[Function] According to the coin sorting device of the present invention, the output voltage and its phase obtained from the bridge circuit when a coin is inserted are supplied to the voltage comparator circuit and the phase comparator circuit provided for each coin. It is determined whether the phase is within a reference voltage range and a reference phase range, and a determination signal is output when it is determined that the phase is within the range. The coin is determined to be a genuine coin only when a determination signal is output from the voltage comparison circuit and the phase comparison circuit corresponding to the coin.

[Example] The present invention will be described in detail below based on the drawings.

FIG. 1 shows an outline of the structure of the coin sorting device of the present invention, where 1 is a coil sensor provided in a coin passage 2 for sorting coins. This coil sensor 1 has a sorting coil 1A as a discrimination section, and when a coin 4 inserted from the coin input port 3 rolls in the coin passage 2 and passes the side of the coil sensor 1, a phenomenon occurs in the sorting coil 1A. Based on the change in impedance, it is determined whether the coin 4 is genuine or false, and the type is sorted. Reference numeral 5 indicates a counterfeit currency passageway that guides only selected counterfeit coins, and reference numeral 5 indicates a genuine currency passageway that guides genuine coins. The coins 4 guided into the genuine coin passage 5 are simultaneously sorted by type based on a sorting signal from the coil sensor 1, and are guided to predetermined positions.

Figure 2 shows the change in impedance generated in the sorting coil 1A of the coil sensor 1 that sorts coin types in this way for three different types of coins (in this example,
10 yen, 50 yen, and 100 yen), and the impedance is shown at the position of each point relative to the zero point 0.

That is, a relationship as shown in the figure is established between impedance resistance R and inductance ωL, and point P indicates the impedance in a general standby state in which the coin 4 is not located opposite the sensor 1. Now, when the 10 yen coin begins to pass through the opposite part of the sensor 1, the impedance changes from the position of point P to the position of point A, and returns to the position of point P once it has finished passing. The path of such change in impedance is shown by a dashed line.

Similarly, in the case of a 50 yen coin, the impedance changes from the position of point P to the position of point B, and then returns to the position of point P (the change path is shown by a broken line), and in the case of a 100 yen coin, the impedance changes from the position of point P to the position of point C, and then returns to the position of point P (the change path is shown by a solid line).

FIG. 3 shows an example of a signal detection circuit that detects the change in impedance in the sorting coil 1A to sort out the type of coin. Here, the sorting coil 1A has resistors r ₁ , R _{1 , R 1} as shown in the figure. ₂ and an inductance L ₁ constitute a bridge circuit 7. A sine wave oscillator OSC with an angular frequency ω ₀ is connected to the bridge circuit 7 to supply an AC output of a predetermined voltage and frequency to the bridge circuit 7 .

In addition, each element of the bridge circuit 7 is adjusted appropriately so that equilibrium (zero voltage) is obtained between terminals T ₁ and T ₂ only when the selection coil 1A exhibits a preselected impedance. . 8 is the terminal
A differential amplifier connected to T ₁ and T ₂ to detect the balanced state. The differential amplifier 8 provides waveforms with different output voltages and phases depending on the type of coin 4 passing through the opposing portion of the coil sensor 1.

In the case of a 10 yen coin, the output voltage obtained from the differential amplifier 8 and its phase are shown in FIG. 4A and B, respectively, where V _OA , V _UA and φ
_OA and φ _UA indicate the upper and lower limits of the output voltage and phase, respectively, when a balanced state is obtained in the bridge circuit 7.

In this way, the output voltage and phase (phase difference with respect to the output phase of the oscillator OSC) obtained from the differential amplifier 8 are calculated for each coin (10 yen, 50 yen, and 100 yen).
Figure 5 shows the radial direction (circle), where the radial direction shows the voltage and the phase is Q (position of OV).
It is shown in the circumferential direction around .

In addition, points A, B, C, and P shown in the same positions as in FIG. 2 in FIG. represents. In other words, as shown in Figure 5, in the case of a 10 yen coin,
The output voltage shown at point A is its upper limit V _OA and lower limit V
It lies in the shaded range bounded by _UA and its phase upper limit φ _OA and lower limit φ _UA .

Similarly, for a 50 yen coin, the output voltage can be obtained within the range limited by V _OB and V _UB and φ _OB and φ _UB . Also, for a 100 yen coin, V _OC and V _UC
The output voltage can be obtained within the range limited by φ _OC and φ _UC .

Returning again to FIG. 3, we will continue to explain the apparatus for sorting coins by detecting the range of the output voltage and its phase difference. In FIG. 3, reference numerals 9, 10, and 11 are voltage comparison circuits designed to detect respective output voltages when the coin 3 is 10 yen, 50 yen, and 100 yen. For example, the voltage comparator circuit 9 that detects the output voltage in the case of a 10 yen coin outputs an output signal of "1" only when the output voltage from the differential amplifier 8 is in the range from V _OA to V _UA . occurs,
This signal is supplied to an AND gate 12 for determining 10 yen genuine coins.

Similarly, voltage comparison circuits 10 and 11 generate output signals "1" only when the output voltage from differential amplifier 8 is in the range from V _OB to V _UB and from V _OC to V _UC , respectively. These signals are then supplied to AND gates 13 and 14 for determining genuine coins for 50 yen and 100 yen, respectively.

A square wave converter 15 converts the sine wave output obtained from the differential amplifier 8 into a square wave output. In addition, 16, 17 and 18 have the phase of the square wave output for the inserted coin 3 of 10 yen, 50 yen and
This is a phase comparator circuit configured to detect whether or not each phase range exists within each of the above-mentioned phase ranges corresponding to the case of 100 yen. For example, if the phase of the square wave output from the square wave converter 15 is between φ _OA and φ _UA , the output signal “1” from the phase comparison circuit 16 is supplied to the AND gate 12, and the phase of the output is between φ _{OB and} φ UA. and φ _UB , the phase comparator circuit 17
An output signal "1" is supplied from the phase comparison circuit 18 to the AND gate 13, and if the output phase is between φ _OC and φ _UC , an output signal “1” is supplied from the phase comparison circuit 18 to the AND gate 14 .

The AND gate 12 outputs "1" to the judgment circuit 19 only when the output signal "1" from both the voltage comparison circuit 9 and the phase comparison circuit 16 is obtained. ” is determined to be a genuine 10 yen coin only when the output occurs once. Similarly, AND gate 13 outputs "1" to determination circuit 19 only when output signals "1" from both comparison circuits 10 and 17 are obtained, and AND gate 14 outputs "1" to determination circuit 19 only when output signals "1" are obtained from both comparison circuits 10 and 17 "1" is output to the determination circuit 19 only when the output signal "1" is obtained from both. Thus, the determination circuit 19 determines that the coin is 50 yen when the AND gate 13 outputs "1" only once, and determines that the coin is 100 yen when the AND gate 14 outputs "1" only once. It is judged to be genuine coin.

FIGS. 4C to 4E show the process from the output signal obtained in this manner to the decision circuit 19 deriving a decision, together with each signal waveform.

As mentioned above, when using a 10 yen coin, the differential amplifier 8
of the output voltage and phase obtained from the fourth
Corresponding to the waveforms shown in Figures A and B, Figure 4C
shows a signal output from the voltage comparator circuit 9 supplied with the output voltage shown in FIG. 4A from the differential amplifier 8. Here, when the output voltage is between V _OA and V _UA , which is the 10 yen specie sorting range voltage, it occurs three times, and therefore three output signals "1" are shown.

FIG. 4D shows an output signal from the phase comparator circuit 16 supplied with the phase output shown in _FIG . There is only one time between _UA and therefore one output signal "1" is shown.

The AND gate 12 to which the output signals shown in FIG. 4C and D are supplied generates an AND output "1" as shown in FIG. The determination circuit 19 determines that the coin is a 10 yen genuine coin.

Regarding 50 yen coins and 100 yen coins,
It follows the same determination process as the 10 yen coin,
Explanation using waveform diagrams such as those shown in FIGS. 4A to 4E will be omitted here.

[Effects of the Invention] As explained above, according to the present invention, in a coin sorting device that sorts multiple types of coins,
Coins are sorted by a sorting coil built into the bridge circuit, and the output voltage and phase obtained from the bridge circuit when coins are inserted are supplied to the comparator circuit. Since the discrimination signal is output only when the coin is within the reference phase range, and only when both the reference voltage discrimination signal and the reference phase discrimination signal are obtained, it is determined that the coin is a genuine coin of that type. By simply incorporating one sorting coil into the bridge circuit, multiple types of coins can be sorted with high precision. Moreover, according to the present invention, while taking advantage of the good selection accuracy of the bridge circuit,
Voltage and phase adjustments can be made independently, making it possible to achieve advanced sorting functions.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the outline of the configuration of the coin sorting device of the present invention, Fig. 2 is an explanatory diagram showing the change in impedance when a coin passes through the sorting coil, and Fig. 3 is a diagram showing the discrimination circuit in the coin sorting device of the present invention. A circuit diagram showing an example, Figures 4A, B, C, D, and E shows the output voltage and phase from the differential amplifier, the output signal from the voltage comparison circuit, the output signal from the phase comparison circuit, and the AND gate. FIG. 5 is an explanatory diagram showing the relationship between the reference voltage and reference phase respectively obtained from the differential amplifier for three types of coins. 1...Coil sensor, 1A...Selection coil, 2
...Coin passageway, 3...Coin slot, 4...Coin,
5... Counterfeit currency passage, 6... Genuine currency passage, 7... Bridge circuit, 8... Differential amplifier, 9, 10, 11...
Voltage comparison circuit, 12, 13, 14...AND gate, 15...Square converter, 16, 17, 18...
Phase comparator, 19...determination circuit.

Claims (1)

[Scope of Claims] 1. A coin sorting device that sorts input coins of a plurality of types, comprising: a bridge circuit incorporating a sorting coil for sorting the plurality of types of coins; A plurality of reference voltage ranges are each set, and the output voltage obtained from the bridge circuit when the coin is inserted is compared with the reference voltage range, and each outputs a voltage discrimination signal only when the output voltage is within the reference voltage range. a voltage comparison circuit, and a reference phase range is set for each of the plurality of types of coins, and the phase of the drive signal for the bridge circuit obtained from the bridge circuit when the coin is inserted is compared with the reference phase range to determine the reference phase. a plurality of phase comparison circuits each outputting a phase discrimination signal only when the coins are within the range; and for each of the plurality of types of coins, the voltage discrimination signal and the phase discrimination signal are output from both the voltage comparison circuit and the phase comparison circuit. 1. A coin sorting device comprising: determination means for determining a coin as a genuine coin only when a signal is obtained.