JPH081669B2 - Coin discriminator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention arranges a measuring sensor that forms an oscillating magnetic field in the rolling path of a coin, measures the degree of influence of the passage of the coin on the oscillating magnetic field, and The present invention relates to a coin discriminating method for discriminating suitability.

(B) Conventional technology As such a coin discriminating method, there is a technology disclosed in Japanese Patent Laid-Open No. 57-27387, which uses the material of the coin (electric conductivity) depending on the influence of the passage of the coin on the oscillating magnetic field. ) ・ Providing a sensor for measuring physical characteristics such as plate thickness and outer diameter, verifying whether the value of the influence of the measuring sensor for each characteristic is within a predetermined allowable range by passing the coin, It is to determine. Further explaining with FIG. 2, A of the same figure shows the arrangement of the measurement sensors (S ₁ ) (S ₂ ) (S ₃ ), and the coin rail (6) communicating with the coin slot (4).
The coins are sequentially arranged on the top along the rolling direction of the coins. When a coin passes through the measuring sensors (S ₁ ) (S ₂ ) (S ₃ ),
The oscillating frequency changes under the influence of the physical characteristics of the coin through which the oscillating magnetic field passes, and the symbols (16) in FIG. 2B respectively.
(18) The measured signal shown in (20) is obtained and its maximum value P ₁
・ P ₂ and P ₃ are detected as the value of the measurement signal. In the following description, the maximum value P ₁ , P ₂ ,
Inspection coin the P ₃ is stated that the degree of influence on the measurement sensor.
And these influences P ₁ , P ₂ , P ₃ are the measurement sensor (S ₁ )
The permissible range l ₁ · shown in FIG. 2C set for each of (S ₂ ) and (S ₃ ).
by matching either included in the l ₂ · l _5, is to determine the proper coins.

(C) Problems to be Solved by the Invention In the above-mentioned conventional technique, the measurement sensor is selected in terms of oscillation frequency and shape or the mounting position from the coin rail (5) so as to be adapted only to the characteristic to be measured. , The measured value inevitably contains other characteristic elements. For example, when trying to measure the material of a coin, the influence of the plate thickness is included. Therefore, when a fake coin made of a material with a smaller electrical conductivity than a true coin and having a thick plate is inserted, each degree of influence obtained by the measurement sensors (S ₁ ) (S ₂ ) is represented by a circle symbol. It may show a value within the allowable range l ₁ · l ₂ .
In addition, when a counterfeit coin made of a material with a higher electrical conductivity than a genuine coin and having a thin plate is inserted, a measurement sensor (S ₁ )
Each degree of influence obtained in (S ₂ ) may show a value within the allowable range l ₁ · l ₂ as indicated by a triangle symbol. Furthermore, if the plate thickness of a coin made of a different alloy or foreign coins of the same material, etc., is thicker than the true coin, it is indicated by the cross symbol.
As indicated by the symbols, the values may fall within the permissible ranges l ₁ and l ₂ , respectively.

From the above point, the present invention is a coin discriminating apparatus for measuring the material and the plate thickness of a coin by changing the oscillation frequency,
(EN) A coin discriminating apparatus capable of preventing erroneous discrimination due to the influence of a plate thickness that is measured as an error regardless of the measurement of a material and erroneous discrimination due to the influence of a material that is measured as an error despite a thickness measurement. is there.

(D) Means for Solving the Problems To solve the above problems, the coin discriminating apparatus according to the present invention is arranged so as to sequentially apply an oscillating magnetic field to the coin passage and the inspection coin passing through the coin passage. Based on the change of the oscillation frequency that changes mainly due to the plate thickness of the inspection coin and the first measurement sensor that outputs the measurement signal based on the change of the oscillation frequency that changes mainly due to the material of the inspection coin A second measurement sensor that outputs a measurement signal, a first collation data storage unit that stores first collation data including upper limit values and lower limit values preset for each of the measurement sensors, and each of the measurement sensors. The second collation data stored in the second collation data, which includes a second upper limit value that is a value less than the sum of the upper limit values for each of the measurement sensors and a second lower limit value that is a value that exceeds the sum of the lower limit values for each of the measurement sensors. Data storage And a value obtained by subtracting a lower limit value of the other measurement sensor from an upper limit value of one of the measurement sensors and a value obtained by subtracting an upper limit value of the other measurement sensor from a lower limit value of the one measurement sensor. Third verification data storage means for storing third verification data composed of a third upper limit value that is a value less than the value and a third lower limit value that is a value greater than the smaller value, and the inspection coin is the coin passage. And the values of the measurement signals by the respective measurement sensors are all within the range of the upper limit value and the lower limit value of the corresponding first verification data, and the sum of the values of the respective measurement signals is the second verification data. The upper limit of the third collation data is a value that is within the range of the second upper limit value and the second lower limit value and that is obtained by subtracting the value of the measurement signal of the other measurement sensor from the value of the measurement signal of the one measurement sensor. Value and lower limit When it is within the range, it is a configuration including a discriminating means for discriminating the inspection coin as proper.

(E) Action When the inspection coin passes through the coin passage and passes through each measurement sensor to obtain a measurement signal, the discriminating means determines the upper limit value and the lower limit value of the first collation data to which the respective measurement signal values correspond. Matches within the range of. Then, the sum of the values of the respective measurement signals is the second upper limit value and the second upper limit value of the second collation data.
Check if it is within the lower limit. Further, it is verified whether the difference value between the value of the measurement signal of one measurement sensor and the value of the measurement signal of the other measurement sensor is within the range of the upper limit value and the lower limit value of the third verification data. Then, if all the collations match within the range, the inspection coin is determined to be proper. At this time, when the values of the measurement signals of the respective measurement sensors are added up, the measurement errors of the respective measurement sensors are summed up and emphasized, so that the values of the respective measurement values are within the range of the first collation data. Even so, the value of the sum of the values of the measurement signals deviates from the second collation data, and the discrimination accuracy improves. Further, when the difference between the values of the measurement signals of the respective measurement sensors is calculated, the measurement error of each is canceled out. Therefore, even if the value of each measurement value is within the range of the first collation data, The value of the difference deviates from the third collation data, and the discrimination accuracy improves.

(F) Example As shown in FIG. _1, each measuring sensor (S ₁ ) (S ₂ ) (S ₃ ) shown in FIG. ₂ inserts a coin passage (5) formed by a coin rail (6). It consists of oscillation coils (15) (17) (19) connected in series and measures the degree of influence of a coin passing through an oscillating magnetic field on the oscillating magnetic field. Oscillators affected by current (11) (12)
The signal indicating the change in the oscillation frequency of (13) is captured as a measurement signal, and the value of the maximum frequency, which is the value of the measurement signal, is detected as the degree of influence of the inspection coin on the measurement sensor.

Further, in this example, the lower limit value data A and the upper limit value data B of the allowable range l ₁ shown in FIG. 2 are set as the first reference data for the measurement sensor (S ₁ ) related to the material, and the allowable range l ₂
The lower limit data C and the upper limit data D of are set as the first collation data for the measurement sensor (S ₂ ) relating to the plate thickness. Further, according to the present invention, the second collation data is further set and the allowable ranges l ₃ and l ₄ are provided. The second matching data is a value based on the sum or difference of the first matching data,
The upper limit data H and the lower limit data G of the second collation data in the case of the sum have the following relationship with the upper limit data B and D and the lower limit data A and C of the first collation data. That is, H <B + D and G> A + C.

The upper limit data F of the second collation data in the case of difference
And the lower limit data E have the following relationship with the above data. That is, F <B-C and E> A-D. And the degree of influence on each measurement sensor (S ₁ ) (S ₂ ) (S ₃ ) by inserting coins
Upon detection of the P ₁ · P ₂ · P _3, with impact P ₁ · P ₂ · P ₃ is to determine whether each tolerance l ₁ · l ₂ · l within _5, impact P ₂
· The difference between P ₁ (P ₁ -P ₂₎ and sum (P ₁ + P ₂₎ is to determine whether each tolerance l _3-l within _4, when it is found to be within the acceptable range in all judgment this coin Is determined to be appropriate.

Since the judgment based on the sum of the influence degrees is to comprehensively see the material thickness and the plate thickness, the error data indicating the characteristics other than the material that is noise in the material measurement and the noise in the plate thickness measurement are used. The error data is added to the error data showing a feature other than a certain plate thickness to increase the error data, so that the coins showing a large error data in the measurement can be reliably separated. In addition, since the judgment based on the difference in the degree of influence is to see the correlation between the material and the plate thickness, each error data in the material measurement and the plate thickness measurement is canceled and based on the characteristics of only the material and the plate thickness. Accurate discrimination can be performed. By taking the difference between the degree of influence P ₂ and P _{1 in} such a discrimination process, the counterfeit coin with reduced electrical conductivity and thicker plate or the counterfeit coin with increased electrical conductivity and thinner plate thickness For example, since the error data of the plate thickness is removed, the degree of influence by the electrical conductivity is directly displayed, and the values can be distinguished by indicating the values of the O symbol and the Δ symbol, respectively. Also, by taking the sum of the influence levels P ₁ and P ₂ , the thickness and size of the modified coins with thick or thin thickness are emphasized and the values of × and □ are shown respectively. Can be sorted.

In Figure 1, the control device (2) is measuring sensor (S ₁₎ (S ₂₎ (S ₃₎ measuring in connection with the control signal a · b · a
c is sequentially and repeatedly output, but the oscillation output of the oscillator (11) is introduced into the counter (1) through the AND gate (21) and the OR gate (24) by the generation of the control signal a, and the control signal b
The oscillation output of the oscillator (12) causes AND gate (2
2) and is introduced into the counter (1) through the OR gate (24), and the oscillation output of the oscillator (13) is introduced into the counter (1) through the AND gate (23) and the OR gate (24) by the generation of the control signal c. To be done. The counter (1) detects the oscillation frequency of the oscillator (11) by counting the oscillation output output from the AND gate (21) during the generation period of the control signal a, and the AND gate (22 during the generation period of the control signal b). ), The oscillation frequency of the oscillator (12) is detected by counting the oscillation output, and the oscillation output output from the AND gate (23) is counted during the generation period of the control signal c. The oscillation frequency of is detected. Then, the control device (2) introduces the oscillation frequency data counted by the counter (1) in a predetermined sampling period by outputting the control signals a, b, and c, and outputs the reset signal (14) after the introduction. Coin is inserted and each measurement sensor (S ₁ ) (S ₂ )
As (S ₃ ) is approached, each oscillator (11) (1
2) The oscillating frequency of (13) rises as shown in FIG. 2B, and falls when passing away after passing. Therefore, the control device (2) successively compares the oscillation frequency data introduced every time the control signal a is output, and determines the maximum value of the oscillator (11) which is the degree of influence on the measurement sensor (S ₁ ) by the coin insertion. frequency
The maximum frequency P ₂ of the oscillator (12), which is the degree of influence on the measurement sensor (S ₂ ), is detected by sequentially comparing the oscillation frequency data that is introduced each time P ₁ is detected and the control signal b is output. Also, the oscillation frequency data introduced each time the control signal c is output is successively compared to detect the maximum frequency P ₃ of the oscillator (13) which is the degree of influence on the measurement sensor (S ₃ ). In the memory (3), the first collation data for each characteristic of material, plate thickness, and outer diameter with respect to the degree of influence detected by each measurement sensor (S ₁ ) (S ₂ ) (S ₃ ), that is, the second Each allowable range l ₁
Upper limit data B, D, J and lower limit data A, C, I for l ₂ and l ₅
Is set. Further, in the memory (3), the second collation data based on the sum and difference of the first collation data regarding the material and the plate thickness, that is, the upper limit data F, H for each allowable range l ₃ · l ₄ shown in FIG. 2C and Lower limit data E and G are set.

Therefore, when the control device (2) detects the influence degree P ₁ on the measurement sensor (S ₁ ) by inserting a coin, the upper limit data B
And the lower limit data A are sequentially collated to determine whether it is within the allowable range l ₁ . When the degree of influence P ₂ on the measurement sensor (S ₂ ) is detected, it is sequentially compared with the upper limit data D and the lower limit data C to determine whether it is within the allowable range l ₂ . And control device (2)
Calculates the difference between the influence levels P ₂ and P ₁ and sequentially compares the difference value with the upper limit data F and the lower limit data E to determine whether the difference is within the allowable range l ₃ . Next, the control device (2) controls the influence levels P ₁ and P ₂
And the upper limit data H and the lower limit data E are sequentially collated to determine whether the value is within the allowable range l ₄ . When the control device (2) detects the degree of influence P ₃ on the measurement sensor (S ₃ ), the control device (2) sequentially checks the upper limit data J and the lower limit data I to determine whether or not it is within the allowable range l ₅ . The control device (2) has an allowable range of l ₁ , l ₂ , l ₃ , l ₄ ,
When it is determined that it is a l within ₅ outputs the proper signal R to determine the deposited coin and proper coins.

(G) Effect of the Invention According to the present invention, the measurement signal based on the change of the oscillation frequency, which is arranged so as to sequentially apply the oscillating magnetic field to the inspection coin passing through the coin passage and changes mainly due to the material of the inspection coin. To the sum and difference values of the respective measurement signals of the first measurement sensor and the second measurement sensor that outputs the measurement signal based on the change of the oscillation frequency that mainly changes due to the plate thickness of the inspection coin. However, in order to make a distinction, the influence of the plate thickness, which is measured as an error when measuring the material, and the influence of the material, which is measured as an error when measuring the plate thickness, are increased in the case of sum and exceed the allowable range. In the case of a difference, the coins are canceled out, so that highly accurate coin discrimination can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating an embodiment of the present invention, and FIG. 2 is an explanatory diagram of coin discrimination processing. (S ₁ ) (S ₂ ) (S ₃ ) …… Measurement sensor, (1) …… Counter, (2) …… Control device, (11) (12) (13) …… Oscillator.

Claims (1)

[Claims] 1. A coin passage and a test signal passing through the coin passage are arranged so as to sequentially apply an oscillating magnetic field to a test signal, and a measurement signal based on a change in oscillation frequency mainly caused by a material of the test coin is transmitted. A first measurement sensor that outputs and a second measurement sensor that outputs a measurement signal based on a change in the oscillation frequency that changes mainly due to the plate thickness of the inspection coin, and an upper limit that is preset for each measurement sensor A first collation data storage unit that stores first collation data composed of a value and a lower limit value, a second upper limit value that is a value less than the sum of the upper limit values of the respective measurement sensors, and each of the measurement sensors. A second collation data storage means for storing second collation data composed of a second lower limit value which is a value exceeding the sum of the lower limit values, and an upper limit value of one of the measuring sensors to a lower limit value of the other measuring sensor. Subtraction The upper limit value of the other measurement sensor and the lower limit value of one of the measurement sensors, the third upper limit value that is less than the larger value and the value that exceeds the smaller value. Third collation data storage means for storing third collation data consisting of three lower limit values, and the first collation data in which inspection coins pass through the coin passage and the values of the measurement signals by the respective measurement sensors all correspond to each other. Within the range of the upper limit value and the lower limit value, the sum of the measurement signals is within the range of the second upper limit value and the second lower limit value of the second collation data, and the measurement of the one measurement sensor is performed. And a discriminating means for discriminating the inspection coin as proper when the value obtained by subtracting the value of the measurement signal of the other measurement sensor from the value of the signal is within the range of the upper limit value and the lower limit value of the third collation data. Coin discriminating device.