JPH02118795A - Detergent liquid injection inspecting device to coin inputting port - Google Patents

Abstract

PURPOSE:To correctly detect that the detergent liquid is injected and to prevent the coin robbery of a vending machine by utilizing lowering of resistance value which is lowered when a voltage is applied by the detergent liquid between electrodes. CONSTITUTION:When a detergent liquid exists at a detergent liquid sensor 13, the resistance value between both electrodes of the sensor 13 is reduced after a prescribed time, the detecting voltage of a sensor circuit 16 rises, a detection reference voltage is exceeded, and therefore, a ripple compensation type detecting circuit 19 continuously generates the output in inverse proportion to the resistance value of the detergent liquid sensor. As the result, since the decision output is also continuously generated from a detergent liquid deciding circuit 25, it is found that the detergent is injected. Thus, the robbery accident that the household detergent liquid for a kitchen is injected to the coin inputting port of the vending machine, flown from a coin passage into a coin mechanism, the electric circuit in the coin mechanism is made to malfunction, the changes are caused to flow out and these are stolen can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for detecting the injection of detergent into a coin slot of a vending machine, which detects when detergent is injected into the coin slot of a vending machine. .

(Prior art) Recently, a household detergent liquid was injected into the coin slot of a vending machine and poured into the coin mechanism from the coin passage, causing the electric circuit in the coin mechanism to malfunction and causing the change to flow out. There have been incidents of theft.

On the other hand, in conventional vending machines, a rainwater outlet is provided in the middle of the coin passage to prevent rainwater from flowing into the inside, and 7k flows out from this rainwater outlet, and rainwater flows into the coin passage after that. I try not to let it flow.

(Problem to be solved by the invention) However, with these measures, if the detergent liquid or spray is injected with force, the rainwater will jump over the outlet and pass through, which cannot be solved. There was a point.

An object of the present invention is to provide a detergent liquid injection detection device for a coin insertion ROM that can detect detergent liquid being injected into a coin insertion slot in any state.

(Means for Solving the Problems) To explain in detail the present invention for achieving the object 1, the device for detecting the injection of detergent liquid into the coin slot of the present invention comprises opposing electrodes arranged in the coin passage. a sensor circuit comprising a detergent liquid sensor installed, a voltage dividing circuit with a resistor connected in series with the detergent liquid sensor, a detection reference voltage forming circuit comprising a plurality of resistors or a voltage dividing circuit connected in series, and the sensor circuit. The detection voltage from the sensor is used as one input, and the detection reference voltage from the detection base voltage forming circuit is used as the other input for comparison. Ripple compensation type detection that operates to output an output voltage inversely proportional to the resistance value of the detergent I liquid sensor and to relatively lower the detection reference voltage by a ripple compensation voltage when the voltage rises above the detection reference voltage. circuit, and a detergent liquid determination circuit that measures the duration of the output of the ripple compensation type detection circuit and determines that the detergent liquid has been injected when the output continues for a predetermined time or more, When the detergent liquid sensor comprising the counter electrode is immersed in natural water such as rainwater and energized, it is made of a conductive material that does not dissolve into the natural water.

(Function) In this invention, when water exists between the opposing electrodes to which direct voltage is applied, the resistance value between the two electrodes increases due to electrolysis of the water between the two electrodes, whereas the detergent liquid This was done by paying attention to the fact that, if it exists, there is a phenomenon in which the resistance value between both electrodes decreases.

Therefore, when detergent liquid is present in this detergent liquid sensor, the resistance value between both electrodes of the sensor decreases after a predetermined period of time, and the detection voltage of the sensor circuit increases and exceeds the detection reference voltage, so ripple compensation type detection is performed. The circuit continuously outputs an output that is inversely proportional to the resistance value of the detergent liquid sensor.As a result, the detergent liquid determination circuit also continuously outputs a judgment output, so it can be determined that detergent has been injected.

On the other hand, if water is present in the detergent liquid sensor, the resistance value between both S poles of the sensor increases after a predetermined time due to water electrolysis, and the detection voltage of the sensor circuit decreases, and after 1 to 2 seconds, the detection reference voltage is not reached, so the ripple compensated detection circuit does not output any output. Therefore, even if the ripple compensation type detection circuit initially outputs an output, the detergent night determination circuit does not output a determination output because it stops outputting after 1 to 2 seconds.

In the ripple compensation type detection circuit, when the detection voltage exceeds the detection reference voltage and outputs an output, the detection reference voltage is lowered by the ripple compensation voltage in a t↑ manner, so immediately after that, the detection voltage becomes higher than the detection voltage. Even if a ripple occurs in which the reference voltage value decreases or increases, the output is not stopped or output, but continues to be output, which prevents chattering and stabilizes the operation.

In addition, if the detergent solution center is made of a material such as copper, gold, or silver, and the counter electrode is immersed in water for a long time, the water becomes an electrolyte and the electrode material is forced out, causing the resistance value to rise again. By using a conductive material such as stainless steel, zirconium, or other ceramic for the counter electrode, which will not be eluted even when immersed in water and energized, the counter electrode may be immersed in water for a long time. Even if the voltage is set, the detection voltage does not reach the reference voltage.

<Embodiment> Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. As shown in FIG.
A coin slot 2 is provided.

On the rear side of this coin slot 2, there is a first coin slot. A coin passage 5 is formed by the second jutes 3 and 4, and coins passing through the coin passage 5 are thrown into a coin mechanism 6. A prevention plate 7 is suspended immediately after the coin slot 2 to prevent rainwater from entering the coin passage 5, falling from the drop opening 8 below into the drainage passage 9, and being drained. There is.・Also, 1st. A kite plate 10 is provided at the lower end of the first chute 3 at the border of the second sheet 3.4 to guide the liquid toward the drain passage 9 side.

Note that 11 is a signboard, and 12 is an illumination light that does not illuminate the signboard 11.

Detergent liquid sensors 1 are installed at multiple locations at the bottom of the coin passage 5.
3 are arranged. As shown in FIG. 3, the detergent liquid sensor 13 is held on an insulating substrate 40 and includes a pair of opposing electrodes 13A and 13B that are placed opposite each other at a predetermined interval. These two cores 138 and 13B are both formed of stainless steel plates, and lead wires 42 and 42 are passed through their lead wire connection terminal portions 41A and 41B, and are fixed with solder 43 and 43. The outer surface of the solder portion is coated with an insulating paint 44.

The materials used for both types of INl 3A and 13B are conductive, so that when the picture electrode is immersed in natural water such as rainwater and energized, the water becomes electrolytic, and the I material is not exposed to the water. Use materials. Specific examples thereof include the above-mentioned stainless steel pond, zirconium, and conductive ceramic.

Electrode 1.3 of detergent liquid sensor 13 configured in this way
A, 13 F3 is incorporated in a sensor circuit 16 consisting of a voltage dividing circuit connected in series with a resistor 14 and a variable resistor 15.The end of the resistor 14 at one end of the four-sensor circuit 16 is connected to a DC power supply (not shown). It is connected to the glass side, and the other end of the variable resistor 15 is grounded. A capacitor 17 is connected in parallel to the variable resistor 15. Sensor circuit 1
The detected voltage of 6 appears across the variable resistor 15 as a divided voltage, and this detected voltage passes through the resistor 18 and is applied to C.M03-
Ripple compensation type detection circuit 1 consisting of an IC comparator
It is applied to the plus input terminal of 9. A resistor 20 is further connected to the input side of the ripple compensation type detection circuit 19.
．． A detection reference voltage forming circuit 22 is provided, which is a voltage dividing circuit in which 21 are connected in series. The end of the resistor 20 at one end of the detection reference voltage forming circuit 22 is connected to the positive side of the aforementioned DC power supply (not shown), and the curved end of the resistor 21 is grounded. The detection reference voltage of the detection reference voltage forming circuit 22 appears at both ends of the resistor 21 as a divided voltage,
This detection reference voltage is applied to the negative input terminal of the ripple compensation type detection circuit 19. This detection reference voltage is determined to have a value equal to the detection voltage for the resistance value of the detergent liquid.

A ripple compensation resistor 23 is connected between the output terminal and the positive input terminal of the J-pull compensation type detection circuit (input terminal 19), which performs an operation 3 of relatively lowering the detection voltage by the Ringer compensation voltage immediately after detecting the detergent liquid. Moreover, between the output terminal and the negative input terminal of the ripple compensation type detection circuit 19,
A sensitivity adjustment resistor 24 is connected.

The output terminal of Resogle 1 (11RA type detection circuit FI?! 19) measures the connection time of the output, and when the output is connected for a predetermined time or more, an output voltage that is inversely proportional to the resistance value of the detergent liquid is continuously applied. A first detergent solution determination circuit 25 is connected to the detergent solution determination circuit 25, which determines that detergent solution has been injected. ing.

This is the first detergent liquid judgment episode! The output voltage of l@25 is input via a resistor 28 to the positive input terminals of two ripple-compensated second detergent liquid determination circuits comprising C and MOS/IC comparators. A resistor 30.3 is connected to the two input terminals of the ripple compensation type second detergent liquid determination circuit.
1 is connected in series to form a voltage dividing circuit. The judgment reference voltage forming circuit 3
An end of the resistor 30 at one end of the resistor 30 is connected to the positive side of a DC power source (not described above), and an end of the resistor 31 at the curved end is grounded. The judgment reference voltage of the judgment reference voltage forming circuit 32 appears as a divided voltage at both ends of the resistor 31, and this judgment reference voltage is applied to the two negative input terminals of the second detergent liquid judgment circuit of Riggleura RD type. It looks like this. This determination reference voltage is determined to have a value equal to the detection voltage for the resistance value of the detergent liquid.

Between the output terminal and the positive input terminal of the ripple compensation type second detergent liquid determination circuit 29, there is an operation for relatively lowering the determination reference voltage by the ripple compensation voltage immediately after the determination of the detergent liquid in this circuit. A ripple compensation resistor 33 is connected to perform this. Further, a sensitivity adjustment resistor 34 is connected between the two output terminals and the negative input terminal of the second detergent liquid determination circuit of the ripple compensation type.

A switching transistor 37 is connected to the output terminal of the ripple compensation type second detergent liquid determination circuit 29 via a resistor 35, 36, and the switching transistor 37 is connected to the collector side of the switching 1 to transistor 37. A buzzer 38 controlled by is connected.

In such a detergent liquid injection detection device, when detergent liquid is injected into the coin slot 2 and passes through the coin passage 5 and reaches the detergent/a sensor 13, the electrode 13A of the detergent liquid sensor 13,
The resistance value between 13B and 13B was 10KΩ when the detergent solution was added, but after 1 to 2 seconds, it decreased to about 5Ω. Therefore, the detection voltage at the input of the nozzle compensation type detection circuit 19 is initially smaller than the detection reference voltage, and the output of the ripple compensation type detection circuit 22 is 0. Next, when the resistance value of the detergent liquid sensor 13 decreases after a predetermined period of time, the voltage division ratio changes and the detection voltage becomes larger than the detection reference voltage, and an output corresponding to the increase appears from the ripple compensation type detection circuit 19. This output increases in inverse proportion to the decrease in the resistance value of the detergent liquid sensor 13. When an output is output from one ripple compensation type detection circuit in this way, the detection reference voltage is relatively lowered by the ripple compensation voltage determined by the resistance value due to the presence of the ripple compensation resistor 23.

Therefore, even if the detection voltage drops and rises to L immediately after that, the detection reference voltage is still lower than that, so one ripple compensation type detection circuit continues to output and prevents chattering in the subsequent circuit. To prevent.

The output of the ripple compensation type determination circuit 19 is given to a first detergent liquid determination circuit 25, and the duration of the output is measured using a capacitor 27. When detergent liquid is present in the detergent liquid sensor 13, input continues to be given to the first detergent liquid determination circuit 25, so that the charging voltage of the capacitor 27 increases and the first level is determined to be at a predetermined level indicating that detergent liquid is being introduced. The judgment output will be output. This first judgment output is applied to the plus input terminal of the second detergent liquid judgment circuit 29 of the ripple compensation type, and the judgment reference voltage is applied from the judgment reference voltage forming circuit 32 to the minus input terminal. In this case, since the first judgment output exceeds the judgment reference voltage, a second judgment output appears from the ripple compensation type second detergent liquid judgment circuit 29 corresponding to the excess. This second judgment output is
It increases in inverse proportion to the decrease in the resistance value of the detergent liquid sensor 13. This second stable output turns on the switching transistor 37 and causes the buzzer 38 to sound, indicating that the detergent liquid has been injected. In addition, the switching transistor 37 operates a relay to stop the coins from flowing out6. Note that such an operation also occurs when saline is injected into the coin slot 2, and the buzzer 38 sounds. Can be done.

On the other hand, when water is injected into the coin slot 2, the resistance value of the detergent liquid sensor 13 initially changes to IOK due to the water injection.
The electrode 13A was about Ω due to water electrolysis.
, 5 OKΩ~ 1-2 seconds after the surface of 13B is insulated
It rises to 150Ω.

Therefore, even if the ripple compensation type detection circuit 19 momentarily outputs an output at first, it immediately stops outputting. This instantaneous output is absorbed by the first detergent liquid determination circuit 25, and the buzzer 38 does not sound.

Even if an erroneous determination output is output from the first detergent liquid determination circuit 25 for some reason, the second detergent liquid determination circuit performs the image output determination, so that erroneous determination can be prevented.

An experiment was conducted to determine the resistance change when a stainless steel plate was attached to the electrode of the detergent liquid sensor and when solder plating was used, and the graph shown in FIG. 4 was obtained. In the graph, ■ indicates detergent, ■ indicates cola, ■, ■ indicate tap water, ■ indicates well water, and ■ indicates rainwater.
uses solder metal for the electrode material, and stainless steel plates are used for the rest. In addition, the circuit shown in Figure 5 was used in the experiment.

(Effects of the Invention) As explained above, in the present invention, the detergent liquid has the characteristic that the resistance value decreases when a voltage is applied between the electrodes, and this is detected by the ripple compensation type determination circuit. Since the detergent liquid determining circuit uses the duration of the output to determine whether the detection is correct or not, it is possible to correctly detect that the detergent liquid has been injected. Therefore, it is possible to prevent coin theft from the vending machine.

In addition, the device of the present invention uses a ripple compensation detection circuit to relatively lower the detection reference voltage by the amount of the ripple compensation voltage after detection, so even if the detection voltage drops or increases immediately after detection, this is ignored. This can stabilize the output and prevent chattering in subsequent circuits.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of a detergent liquid injection detection device according to the present invention, Fig. 2 is a vertical cross-sectional view of a main part of an example of a vending machine to which the present invention is applied, and Fig. 3 is a detergent liquid sensor. A perspective view of
FIG. 4 is a graph showing the experimental results, and FIG. 5 is a circuit used in the experiment. 1... Vending machine, 2... Coin slot, 5... Coin passage, 13... Detergent liquid sensor, 13A. 13B...Electrode, 14...Resistance, 15
...Variable resistor, 16...Sensor circuit, one...Ripple compensation detection circuit, 20.21.
...Resistor, 22...Detection part quasi-voltage forming circuit,
23... Ripple compensation resistor, 25... First detergent liquid determination circuit, 26... Resistor, 27...
... Capacitor, two ... Second detergent liquid judgment circuit, 32 ... Judgment reference voltage forming circuit, 37.
...Switching transistor, 38...
・Buzzer patent applicant Meiwa Screen Co., Ltd.

Claims (1)

[Claims] A sensor circuit consisting of a voltage dividing circuit consisting of a detergent liquid sensor arranged in a coin passageway and a resistor connected in series with the detergent liquid sensor, and a detection circuit consisting of a voltage dividing circuit in which a plurality of resistors are connected in series. The detection voltage from the reference voltage forming circuit and the sensor circuit is used as one input, and the detection reference voltage from the detection reference voltage forming circuit is used as the other input for comparison. An operation of outputting an output voltage that is inversely proportional to the resistance value of the detergent liquid sensor and relatively lowering the detection reference voltage by a ripple compensation voltage when a liquid is present and the detection voltage rises above the detection reference voltage. a ripple compensation type detection circuit that measures the duration of the output of the ripple compensation type detection circuit, and determines that the detergent liquid has been injected when the output continues for a predetermined time or more. and a detergent solution to the coin slot, which is made of a conductive material that does not dissolve into the natural water when the detergent solution sensor consisting of the counter electrode is immersed in natural water such as rainwater and is energized. Injection detection device.