JPS5892087A - 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 performs a certain operation by inserting a coin, it is necessary to determine whether or not the inserted coin is a specified genuine coin. Proposed.

For example, a detection coil consisting of a pair of transmitting coils and a receiving coil placed oppositely across a coin passage is provided, and when a coin is present between the two coils, the output of the receiving coil detects the material of the coin. There is a coin material sorting device for sorting.

However, it is not desirable in terms of power consumption to keep such a coin material sorting device in a standby mode for coins that do not know when they will be input. This is extremely inconvenient for public telephones using this system.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a coin material sorting device that significantly reduces power consumption.

In order to achieve such an object, the present invention provides a coin passage detection means in the coin passage above the detection coil, and when the detection means detects the passage of a coin, the material of the coin is sorted based on the way the limb is detected. A power switch for supplying power to the circuit is turned on, and the power switch is opened by the selection output of the coin material selection circuit.
This is what I did.

In other words, by supplying the power supply voltage to the coin material sorting circuit only when the sorting operation is actually performed, the power consumption in the coin material sorting circuit is kept to the necessary minimum. be. Hereinafter, the present invention will be described in detail using an embodiment. FIG. 1 is a block diagram showing an embodiment of the present invention.

This embodiment is an example in which the present invention is applied to a public telephone set, and a central office power supply is used as the power supply.

That is, in the figure, 10 is a public telephone circuit, and 11 is a public telephone circuit.
12 is a diode bridge circuit, 12 is a power supply circuit, 13m is a dial contact, 13b is a short-circuit contact, and 14 is a communication circuit. The power supply circuit 12 is connected to the material selection circuit via a power switch 15, and when the power switch 15 receives the power signal 1 and is turned on, it supplies the power supply voltage V to the material selection circuit. Such a power signal image 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#
The voltage supplied via the on-hook W14 (when the handset is placed, i.e., when there is no call) flows through the capacitor 44 through the high resistance 42 and the diode 43. , charge this. In this case, the Zener diode 45 is for stabilizing the voltage supplied to the capacitor 44. On the other hand, in off-hook state II (the state in which the handset is picked up, that is, the state in which it is used), the hook switch 41 is connected in the opposite direction as shown, so that the NFCX pressure supplied from the exchange side charges the capacitor 44 via the diode 46. and 1 diode 4
7 to charge the capacitor 4B. In this case, Zener diode 49 stabilizes the voltage supplied to both capacitors 44 and 48. In this way, capacitor 4
Since a voltage is generated at 8 when off-hook, this voltage can be used for the material selection circuit. Note that a voltage is generated in the capacitor 44 regardless of whether it is on-hook or off-hook, and is used as a power source for something that requires a constant voltage supply, such as a RAM, for example.

Further, in FIG. 1, a diode bridge circuit 11 is used to keep the polarity of the voltage sent to the voltage circuit 12 constant regardless of the polarity of the DC voltage from the exchange. Also, when the dial is turned, the dial contact 13m opens and closes the number of times corresponding to the number on the dial to indicate the number of the other subscriber. □ Sends a dial signal to the exchange and notifies the exchange.The short-circuit contact 13b closes at this time to make a call. The circuit 14 is short-circuited 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, 17 is an oscillation circuit, and 18 is a detection coil.

The detection coil 18 consists of a pair of transmitting coils 18 and receiving coils 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 the two coils, and compares it with a reference value to send out a comparison output. On the other hand, the transmitter coil 18m has an amplifier circuit 22. Rectifier circuit 23. Comparison circuit 2
4 is connected to detect the eddy current loss caused by the coin, compare it with a reference value, and send out a comparison output f. These comparison outputs.

f are both input to the gate circuit 25, and the gate circuit 25
determines the logic and sends an output signal t 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 a ferromagnetic material, there will be almost no signal induced in the receiving coil 18b, but the eddy current product on the transmitting coil 11a side is also used as a detection element, and the logical output of both is used as a detection element. By using the discrimination signal, it is possible to distinguish the materials of coins made of ferromagnetic materials such as iron and nickel.

Coin passage detection s27 is used to control the timing of supplying the power supply voltage V to such a material selection circuit and outputting a discrimination signal. This coin passage detection section 27ti
As shown in FIG. 3, a pair of light emitting elements 28& and a light receiving element 28b are arranged above the detection coil 18 in the coin passage 50 and facing each other with the coin passage 50 in between.
It has a photoelectric detector 28 consisting of a light emitting element 2.
When the coin 51 passes between 8m and the light receiving element 21b, a coin passing detection signal j is output as the Q output of the monostable circuit 29.
Output. Further, a drive pulse generation circuit 30 is provided to drive the light emitting element 28m. The drive pulse generation circuit 30 includes an oscillation circuit 31, a binary counter, 32, and a gate circuit 33 that generate clock pulses, and generates a drive pulse signal a having a predetermined period and a short width as described later. The light is sent to the light emitting element 28m and is also input to the flip-flop 35 via the inverter 34. The clip 70 tube 35 receives the inverted output of the drive pulse signal a and the detection output of the light receiving element 28b, and sends out a Q output signal C to the monostable circuit 29 and the gate circuit 25. In response to this, the monostable circuit 29 sends the Q output signal d to the gate circuit 25 and the gate circuit 36. The gate circuit 36 receives this Q output signal d and the discrimination signal 1 as input, and sends an output signal of the KL level to the power switch 15 as the power signal 1 when both internal inputs are at the L level.

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

In FIG. 1, the drive pulse generation circuit 30 divides the clock pulse generated by the oscillation circuit 31 as described above by the binary divider 32 and the gate circuit 33, and divides the clock pulse into a fourth clock pulse.
A drive pulse signal a as shown in Fig.
is the time during which the inserted nine coins block the optical path between the pixel elements when they roll and pass between the light emitting element 281 and the light receiving element 28b, as shown in FIG. 4(b); In Figure 3, the time T for the coin 51 to move from the solid line position to the broken line position is KIP! Also, set it shorter than 0, which is
The pulse width τ is extremely small, that is, 31? in this example, so that the duty ratio is sufficiently small. +1 period T! It is set to 0.1 m-. Therefore, as shown in FIG. 4(c), the Q output signal C of the flip-flop 35 becomes H when the first driving pulse is sent after the coin starts passing, that is, after it starts passing between the light emitting element 28m and the light receiving element 28b. level and triggers the monostable circuit 29. As a result, the output dFi of the monostable circuit 290Q becomes L level as shown in FIG. 4(d). At this time, the output signal t of the gate circuit 25 is at the H level, and the discrimination signal as the Q output of the monostable circuit 26 remains at the L level, so all inputs of the gate circuit 36 are at the L level. As a result, as shown in FIG. 4(1), the power supply signal i becomes L level, the power switch 15 is turned on, and supply of power supply voltage to the material selection circuit is started. At the same time, the "coin passage detection signal" as the Q output of the monostable circuit 29 becomes H level, confirming the passage of the coin.

In this way, when a coin 51 is inserted, it is detected by the coin passage detection section 27 before the coin reaches the detection coil 18 constituting the material selection circuit, and the power switch 15 is turned on based on the detection output. Since the power supply voltage is supplied to the material sorting circuit, the material sorting circuit does not need to be in a standby state all the time.Furthermore, the light emitting element 28& as a coin passage detection means is driven by a pulse with an extremely small duty ratio. Therefore, power consumption can be significantly reduced. In this case, the period T1 of the mosquito driving pulse signal a is set to be smaller than the time TI during which a coin rolling in the coin path interrupts the space between the light emitting element 28m and the light receiving element 2@b, as described above. , the coin does not pass between the pixel elements while not a single pulse is sent out, and the passing of the coin is reliably detected. That is, even though the power consumption is significantly reduced by the interlocking drive, the detection accuracy does not decrease at all compared to the case where the device is always in the standby state.

Next, after the coin has passed between the light emitting element 28m and the light receiving element 28b, the first driving pulse is sent out, and at the 9th point,
The Q output signal C of the flip-flop 35 returns to L level. During this time, the operation of the material sorting circuit that was powered on first becomes stable, and a highly accurate sorting operation becomes possible. Therefore, the material is sorted while the coin 51 rolls and passes between the transmitting coil 18m and the receiving coil 11b. That is, when a coin passes between both coils,
The voltage induced in the receiving coil 18b changes depending on its magnetic permeability. Therefore, the voltage output of the amplifier circuit 1B
The DC voltage level obtained by rectifying the amplified output in a rectifier circuit 20 is compared with a predetermined reference voltage level band in a comparator circuit 21.

In this case, if the coin is made of a material with low magnetic permeability, such as iron or lead, a relatively large induced voltage can be obtained in the receiving coil 18bKFi, but if the material is made of a ferromagnetic material such as iron or nickel, There is almost no induced voltage mentioned above. As a result, in the former case, the comparison output e maintains the h level, whereas in the latter case, it becomes L as shown in Figure 4 (-).
level. Therefore, by using this comparison output e, counterfeit coins made of non-ferromagnetic materials can be eliminated.

On the other hand, the output taken from the transmitting coil 18 & varies 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, a relatively large output will be obtained from the transmitter coil 1B due to the large eddy current product, whereas if the coin is made of nickel, only a small output will be obtained. do not have. As a result, in the former case, the comparison output f remains at H level, whereas in the latter case, it becomes L level as shown in FIG. 4(f). Note that the comparison output f is also at the H level when the coin is copper or copper.

Therefore, the comparative output e
and the comparison output f both go to L level. During this period, the Q output signal C of the flip-flop 35 and the monostable circuit 29
Since both of the Q output signals d are at the L level, all four inputs of the gate circuit 25 are at the L level, and as a result, the output signal t is at the L level as shown in FIG. As a result, the discrimination signal as the Q output of the monostable circuit 26 becomes H level as shown in FIG. 4(h), and it can be determined that the inserted coin is a genuine coin made of nickel. at the same time,
As a result of this H level discrimination signal being input to the gate circuit 36, the power supply signal 1 becomes H level and the power switch 1 is turned off.
Five companies are disconnected, the supply of power voltage to the material sorting circuit is stopped, and the sorting operation ends.

The Q output as the coin passage detection signal j and the silkworm output signal d of the monostable circuit 29 automatically return to their original states after a certain period of time has elapsed.

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
The gain of the amplifier circuit 19°22 is adjusted to v4 so that the input level of 4 falls within the reference level band. In particular, the amplifier circuit 22 mainly functions only as a matching circuit, and its gain is usually less than 1.

In this way, 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 power consumption can be kept to the minimum necessary. .

Further, after the Q output signal d of the monostable circuit 29 becomes L level and the power switch 15 of the material selection circuit is turned on, after the coin has passed between the light emitting element 28m and the light receiving element 28b, Until the Q output signal C of the flip-flop 35 becomes L level after the first drive pulse is sent, the output signal f of the gate circuit 25 is L level regardless of the level of the comparison output elf of the material selection circuit. Level Tona 5
, an H level discrimination signal is never output. The reason why a fixed time interval is set between the power-on and the transmission of the H level discrimination signal is to take into consideration the transient state immediately after the power is turned on. That is, the operation of the material selection circuit is sufficiently stabilized during this prohibition time, so that after the first drive pulse is sent out and the prohibition is canceled, the coin passes between the transmitting coil 181L and the receiving coil 18b. The sorting operation during passing is performed accurately.

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 supply of the power supply voltage is automatically cut off after the sorting operation is completed. There is no need to keep the material sorting circuit always on standby for coins that do not know when they will be inserted. Therefore, it has the excellent effect of significantly reducing power consumption, and is particularly useful in equal voltage public telephones using a local power supply system in which it is desired to suppress power consumption as much as possible.

[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. Figure 4 is the first
It is a time chart of each output pulse of the coin material sorting device shown in the figure. 12...Power supply circuit, 15...Power switch, 1
7... Oscillation circuit, 18... Detection coil, 21.
24・Meeting Φ・Comparison circuit, 25.36・φφ・Gate circuit, 26.290... Monostable circuit, 27... Coin passage detection section, 28... Photoelectric detector, 30...・Drive pulse generation circuit, 35...7 lips, 70 lips, 5o
・ψ・・Coin aisle, 51・・・Coin. Patent applicant Tamura Electric Manufacturing Co., Ltd. Agent Masaki Yamakawa (and 1 other person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) a coin passage detecting means disposed in a coin passage; a coin material sorting circuit having a detection coil disposed below the detecting means; a power switch connecting the coin material sorting circuit and a power supply; A coin material sorting device characterized by comprising a circuit for turning on the power switch in response to the output of the cough detection means when the detection means detects passage of a coin. a coin passage detecting means; a coin material sorting circuit having a detection coil disposed below the detecting means; a power switch connecting the coin material sorting circuit to a power source; a coin passing detecting means detecting passage of a coin; Km when the circuit for turning on the power switch in response to the output of the detection means and the coin material selection circuit have selected the material of the coin! A coin material sorting device comprising: a circuit that turns off the power switch in response to a sorting output.