JPS5892086A - Coin material selector - 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 material sorting device that electromagnetically sorts the material of coins.

For example, in a device such as a public telephone that can perform a certain operation by inserting a coin, it is necessary to determine whether or not the inserted coin is a specified genuine coin. Various sorting devices have been proposed.

One such method is to install a detection coil consisting of a pair of transmitting coils and a receiving coil that are placed opposite each other across a coin passage, and to select the material of the coin based on the output of the receiving coil when there is a coin between the two coils. There is a coin material sorting device that does this.

However, it is not desirable in terms of power consumption to always keep such a coin material sorting device in a standby state for coins that do not know when they will be input.
This is extremely inconvenient for public telephones using a central power supply system, where it is desired to suppress power consumption as much as possible.

To solve this problem, a coin passage detection means is provided above the detection coil, and when the coin passage detection means detects passage of a coin, the power switch of the material selection circuit is turned on. There are ways to reduce the power consumed by the sorting circuit.

However, if this method is adopted, the selection signal can be sent while the operation of the material selection circuit is not necessarily stable, which may cause malfunction. In particular, when sorting coins while passing them between detection coils without keeping them stationary,
Because judgments are made based on very short-term phenomena, the risk of making incorrect judgments increases.

Misfire F! AFi was created in response to this situation, and its purpose is to provide a coin material sorting device that can significantly reduce power consumption and accurately sort coins without having to keep them stationary. There is a K.

In order to achieve such an object, the present invention includes a circuit that superimposes the output of the selection signal of the coin material selection circuit while the coin passage detection means detects passage of a coin and sends out a detection output. It was established.

That is, at the time when the coin passage detection means starts detecting the passage of a coin, the material selection circuit is turned on, and the material selection circuit is turned on until the coin completely passes through the monitoring area by the detection means. This is a time for stabilization, and no sorting operation is performed during this time.

Hereinafter, the present invention will be explained in detail using Examples.

FIG. 1 is a block diagram showing a dormitory embodiment of the present invention.

This embodiment is an example of a Kubacha system applied to a public telephone set, and uses a local power source as a power source.

That is, in the figure, 10 is a congregation telephone circuit, and 11 is a congregation telephone circuit.
12 is a diode bridge circuit, 12 is a power supply circuit, 13a is a dial contact, 13b is a short-circuit contact of Vi, and 14 is a communication circuit. The power supply circuit 12t-j is connected to the material selection circuit via a power switch 15, and when the power switch 15 is turned on in response to a power signal 1, a power supply voltage V is supplied to the material selection circuit. This power signal amount is
It is generated in response to a coin passage detection signal sent from a coin passage detection section, which will be described later.

Note that the power supply circuit 12 is specifically configured as shown in FIG. 2, for example. That is, in FIG. 2, 41 is a hook switch, and in the on-hook state (the handset is placed, i.e., when there is no call), it is in the position shown in the figure, so the diode is connected from the exchange side connected to terminals Ll + Ll. The voltage supplied through the bridge circuit 11 causes a small current to flow through the high resistance 42 and the diode 43 to the capacitor 44, charging it. In this case, the Zener diode 45 is supplied to the capacitor 44 and stabilizes the voltage. On the other hand, in the off-hook state II (the state in which the handset is lifted up, that is, the use state 111), the hook switch 41 is connected in the opposite direction as shown, so it must be replaced! !
The voltage supplied from the side charges capacitor 44 via diode 46 and charges capacitor 48 via diode 47. In this case, Zener diode 49 stabilizes the voltage supplied to both capacitors 44 and 48. In this way, the capacitor 48 has
Since a voltage is generated when off-hook, this voltage can be used for the material selection circuit.
On-hook and off-hook, a voltage is constantly generated, and is used as a power source for devices that require a constant voltage supply, such as RAM.In addition, in the striped diagram 1, the diode bridge circuit 11 is connected to a switchboard. The purpose is to always keep the polarity of the voltage sent to the power W circuit 12 constant regardless of the polarity of the DC voltage from A 0-short contact 13b opens and closes as many times as the number corresponds to the number to send and notify the exchange of a dial signal indicating the other party's number.
is closed at this time to short-circuit the communication circuit 14 to prevent the dial signal from affecting the communication circuit 14. In FIG. 1, 16 is a stabilizing circuit that stabilizes the power supply voltage V, and 1T is The oscillation circuit includes a detection coil 18.

The detection coil 18 consists of a pair of transmitter coil 18a and receiver coil 18b, which are arranged opposite to each other across the coin path and are electromagnetically coupled to each other. The receiving coil 18b includes an amplifier circuit 19. Rectifier circuit 20. A comparison circuit 21 is connected to detect the output voltage of the receiving coil 18b, which changes depending on the magnetic permeability of the coin passing between both coils, and compares it with a reference value to send out a comparison output e. The transmitting coil 18a includes an amplifier circuit 22. Rectifier circuit '23.
A comparison circuit 24 is connected, which detects the eddy current product generated by the coin, compares it with a reference value, and sends out a soft output f. Both comparison outputs @ and f are sent to the gate circuit 25. The gate circuit 25 determines its logic and sends an output signal to the monostable circuit 26. As a result, a discrimination signal is obtained as the Q output of the monostable circuit 26.

In this case, if the inserted coin is ferromagnetic, there will be almost no signal induced in the receiving coil 18b, but the eddy current loss on the transmitting coil 18m side is also used as a detection element, and the logical outputs of both are detected. By using the discrimination signal, it is possible to distinguish the materials of coins made of ferromagnetic materials such as iron and nickel.

There is a coin passage detecting section 27 that supplies the power supply voltage V to such a material sorting circuit and controls the timing of outputting a discrimination signal. This coin passage detection section 27 is
As shown in FIG. 3, the detection coil 1 of the coin passage 50
A pair of light-emitting elements 28a and light-receiving elements 28b are arranged facing each other across the coin passage 50 above KS 8.
When a coin 51 passes between the light emitting element 28& and the light receiving element 28b, a coin passage detection signal j is outputted as the Q output of the monostable circuit 29. Further, a drive pulse generation circuit 30 is provided to drive the light emitting element 28m. This drive pulse generation circuit 30 includes an oscillation circuit 31 that generates clock pulses, a binary counter 32, and a gate circuit 3.
As will be described later, a drive pulse signal a having a predetermined period and a short width is sent to the light emitting element 28m and is also input to the flip 70 knob 35 via the inverter 34. The flip-flop 35 inputs the inverted output of the drive pulse signal a and the detection output of the light receiving element 28b, and connects the monostable circuit 29, the gate circuit 25, and the KQ
Sends output signal C. In response to this, monostable circuit 29
sends the Q output signal d to the gate circuit 25 and gate circuit 311. The gate circuit 36 receives this Q output signal d and the above-mentioned discrimination signal, and both inputs are set to KL.
In the case of the KL level, the output signal of the KL level is sent to the power switch 15 as the power signal l.

Next, when there are two types of coins to be sorted, iron and nickel, both of which are made of ferromagnetic material, 1 the operation of the coin material sorting device having the above configuration will be performed to determine the authenticity and type of the coins. will be explained using the time chart of FIG.

In FIG. 1, the drive pulse generation circuit 30 divides the clock pulse generated by the oscillation circuit 31 as described above using the binary counter 32 and the gate circuit 33, and divides the clock pulse into a fourth clock pulse.
A drive pulse signal a as shown in Figure (a) is generated and sent to the light emitting element 28&.

The driving pulse signal of , the period Tsa of a, FIG. 4(b)K
As shown in FIG. 3, when an inserted coin rolls and passes between the light emitting element 211a and the light receiving element 28b, it travels along the optical path between the pixel elements, that is, the coin 5 in FIG.
The time T required for 1 to move from the solid line position to the broken line position is also set short.

Further, the pulse width τ is extremely small, that is, it is set to 0.1 ms for the period ↑l of − in order to make the duty ratio sufficiently small. Therefore, the Q output signal CFi of the flip-flop 35 emits light after the coin starts passing, as shown in FIG. 4(e).

The monostable circuit 29 is triggered when the first drive pulse is sent out after the device 28a and the light receiving element 28b are interrupted. As a result, the Q output d of the monostable circuit 29 becomes L level as shown in FIG. 4(d). At this time, the output signal of the gate circuit 25 is at the FF1H level.
Since the discrimination signal as the Q output of the monostable circuit 26 remains at the L level, both inputs of the gate circuit 36 are at the L level, resulting in a power supply signal as shown in Figure 4 (0). l becomes L level and the power switch 15 is turned on,
Supply of power supply voltage to the material selection circuit is started.

At the same time, the coin passage detection signal j, which is the Q output of the monostable circuit 29, becomes H level, confirming that the coin has passed.

When a coin 51 is inserted, it is detected and detected by the coin passage detection section 27 before the coin reaches the detection coil 1B that constitutes the material selection circuit, and the coin is detected and detected by the coin passage detection section 27. As a result of the output, the power switch 1s□ is turned on and power voltage is supplied to the material selection circuit, so it is necessary to keep the material selection circuit in the normal/special condition. Since the light emitting element 28m is driven by a pulse with an extremely small duty ratio, power consumption can be significantly reduced. In this case, the period Tstf of the drive pulse signal a is set to be smaller than the time T for the coin rolling in the coin path to wrap between the light emitting element 28a and the light receiving element 211b as described above. There is no possibility that a coin will pass between the pixel elements without even sending out pulses of m.
The passage of the coin is reliably detected.

That is, even though the power consumption is significantly reduced by intermittent driving, the detection accuracy is completely reduced compared to the case where the device is always in a standby state.

Next, at the time when the first driving pulse is sent out after the coin has passed between the light emitting element 28m and the light receiving element 21b, the Q output of the knob 70 and the knob 35 (No. 1 C returns to the L level. During this time, the operation of the material sorting circuit, which was powered on earlier, stabilizes and becomes capable of highly accurate sorting.Then, the coin s1 transmits; the coil 1-a and the receiving coil 1llb. In other words, when a coin passes between both coils, the receiving coil 1
11bK induced voltage changes. Therefore, this voltage output is amplified by the amplifier circuit 19, and the amplified output is rectified by the rectifier circuit 20. The DC voltage level obtained by
The voltage is compared with a predetermined base ring voltage level band. In this case, if the coin is made of a material with low magnetic permeability, such as steel or lead molten, a relatively large induced voltage can be obtained in the receiving coil 18b, but if the wrinkle material is made of a ferromagnetic material such as iron or nickel, a relatively large induced voltage can be obtained. In this case, there is almost no induced voltage. As a result,
In the former case, the comparison output e remains at H level, whereas in the latter case, it becomes L level as shown in FIG. 4(e). Therefore, by using this comparative output, counterfeit coins made of non-ferromagnetic materials can be eliminated.

On the other hand, the output taken out from the transmitting coil H1m changes depending on the eddy current product. Therefore, this voltage output is amplified by an amplifier circuit 22, this amplified output is rectified by a rectifier circuit 23, and the obtained DC voltage level is compared with a predetermined reference voltage level band by a comparison circuit 24. In this case, if the material of the inserted coin is iron, the transmitting coil 18aKa can provide a relatively large output when the coin has a large eddy current product, whereas if the coin is made of nickel, only a small output can be obtained. As a result, in the former case, the comparison output fFiH
In the latter case, the 4th E(f
) becomes L level as shown in K. Note that the comparison output f is also at the H level when the coin is made of copper, lead, or the like.

Therefore, the comparative output
and comparison output fa both go to L level.

During this time, since the flip-fultub 350Q output signal C and the monostable circuit 2sOQ output signal d are both at the L level, all four inputs of the gate circuit 2s are at the L level, and as a result, the output signal t becomes the 411th (P). As shown, it becomes L level. As a result, the discrimination signal as the Q output of the monostable circuit 26 becomes H level as shown in Fig. 4).
It can be determined that the inserted coin is a genuine coin made of nickel.0 At the same time, this H level discrimination signal is input to the gate circuit 36, and as a result, the power signal 1 becomes H level and the power switch 15 is cut off. The supply of power supply voltage to the material sorting circuit is stopped, and the sorting operation ends.The Q output and the Q output signal d as the coin/currency detection signal j of the monostable circuit 29 are automatically stopped after a certain period of time has passed. The state will be restored.

The reference level bands of the comparison circuits 21.24 are all set to the level bands with the best resolution, and when a predetermined coin is inserted, each of the comparison circuits 21.2
In particular, the gain of the amplifier circuit 1-922 is adjusted so that the input level of 4 falls within the reference level band.
In the case of the amplifier circuit 22, it mainly functions only as a matching circuit, and its gain is usually less than 1. In this way, the Q output signal d of the monostable circuit 29 becomes L level, and the material selection circuit After the power switch 15 is turned on, the coin passes through the light emitting element 28a and the light receiving element -P28b.
The level of the comparison output of the material sorting circuit, f, from the time when the first drive pulse is sent out until the Q output signal C of the flip full tube 3S becomes L level is Regardless of the output signal V of the gate circuit 25
In this case, the L level, black, and H level discrimination signals are not output. Therefore, the pressure of the material sorting circuit is sufficiently stabilized during this prohibition time, and as a result, after the first drive pulse is sent out and this prohibition is canceled, the coin is transferred to the transmitting coil 18.
1 and the receiving coil tab is accurately performed. That is, in this case, from the viewpoint of reducing power consumption, it is preferable not to turn on the power until just before the coins reach the position of the detection coil and the sorting operation is performed, but after turning on the power, the It takes a certain amount of time for the operation of each component of the sorting circuit to reach a steady state, and accurate operation cannot necessarily be expected during this transitional period.For this reason, the above power supply is required to stabilize the material sorting circuit. The input is made earlier by a certain amount of time, and no discrimination operation is performed during this time.

Further, the power switch 15 is automatically turned off when the output of the discrimination signal starts, cutting off the supply of power supply voltage to the material selection circuit, so that power consumption can be suppressed to the necessary minimum.

As explained above, according to the present invention, the power supply voltage is automatically supplied to the coin material sorting circuit only when necessary, and the sorting signal is not output until the coin material sorting circuit is sufficiently stabilized, thereby reducing power consumption. It has the excellent effect of being able to accurately sort coins using electricity and without having to keep the coins stationary, and is particularly useful for public telephones and the like that are powered by a central office.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific configuration example of a power supply circuit, FIG. 3 is an explanatory diagram showing the arrangement of a detection coil and a photoelectric detector, and FIG. Fig. 4 is a time chart of each output pulse of the coin material sorting device shown in Fig. 1; 12 Working...Power supply circuit, 15...Power switch, 1
7... Oscillation circuit, 18... Detection coil, 21.
24... Comparison circuit, 25.36... Gate circuit, 26.28... Monostable circuit, 21... Red currency excess/excess detection section, 28... Photoelectric detector, 30... Drive pulse generation circuit, 35@1... Flip 7o knob, 50
... Coin aisle, 51... Coins. Patent applicant Masaki Yamakawa (and one other person) on behalf of Tamura Electric Manufacturing Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] nine coin passage detection means disposed in the coin passage; a coin material selection circuit having a detection coil disposed below the detection means; a power switch circuit that is turned on to supply a power supply voltage to the coin material selection circuit; and a circuit that prohibits output from the coin material selection circuit while the detection means detects passage of a coin. A coin material sorting device that is characterized by ◇