JPH0435976Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Technical field of invention) This invention is suitable for coin processing machines, especially coin sorting machines, coin deposit machines, etc. that can be applied immediately to coins of various countries by just changing the software, and can reliably identify the denomination and authenticity of coins. The present invention relates to a material sensor in a coin processing machine having such a structure. (Technical background of the invention and its problems) Conventionally, there are various types of coin sorting machines (coin deposit machines, coin deposit and withdrawal machines, etc.). For example, the coin sorting machine (patent application filed in 1983) filed by the present applicant.
No. 271962) is designed to identify coins being moved by a conveyor belt on a horizontal passage surface based on the output of a material sensor provided between the upper and lower sides of the passage. This material sensor inputs an alternating current signal to the primary coil wound around the primary core provided below, and has a structure in which the central part of the primary coil is cut off facing the primary core for maintenance reasons. , the denomination and authenticity of a coin can be determined by comparing the induced output values of two secondary coils wound around two secondary cores with a pre-stored reference value for each coin. I have to. A conveyor belt passes between the secondary cores that are split in the center, transporting coins at high speed. In countries where the difference between the largest and smallest diameter coins in circulation is small, such as Japan, it is possible to reliably identify coins of various denominations even if they are not along one side of the aisle and are shifted to the left or right. I'm starting to be able to do it. This is because even if the coin with the smallest diameter deviates from side to side, it will always pass through the partner part of the secondary coil, so it can be detected. However, in countries where the difference between the largest diameter coin and the smallest diameter coin is large, such as West Germany and the United States, the diameter of the small diameter coin is smaller than the interval between the divided secondary cores, so the small diameter coin passes through the center part. When doing so, since it does not pass through either of the two secondary coils, a correct detection output cannot be obtained, making it impossible to identify small diameter coins. (Purpose of the invention) This invention was made due to the above-mentioned circumstances, and the purpose of this invention was to determine the width of the primary coil wound around the primary core and the width of the secondary coil wound around the secondary core. By making the width of the next coil wider than the width of the path through which the coins to be identified are conveyed, it is possible to ensure the authenticity and type of coins even in countries where various coins with large differences in diameter are in circulation. It is an object of the present invention to provide a material sensor for a coin processing machine that can identify coin jams and facilitate maintenance for coin jams. (Means for Solving the Problem) This invention relates to a material sensor in a coin processing machine, which forcibly transports coins on a passage surface using a conveyor belt, and detects the denomination and authenticity of the transported coins using a material sensor. In the processing machine, the material sensor is embedded in a primary core and a primary coil that is wound around the primary core and excited, and is bent in a U-shape from the passage surface to the inside. parts and
A secondary core and a secondary coil that is wound around the secondary core and detects the denomination and authenticity of the coin by the output induced when the coin passes through the passage surface are embedded, and the secondary coil is embedded in the primary member. 2 plate-shaped plates that can be attached and detached to
and a secondary member, and the conveyor belt is passed through an empty space between the primary member and the secondary member. (Function) First, the principle of the material sensor of this invention will be explained. FIG. 1 shows the principle system of the material sensor of this invention. The material sensor consists of a primary coil 102 wound around a primary core 100 and a secondary coil 103 wound around a secondary core 101. It is configured. When an alternating current I having a frequency ω is applied to the primary coil 102, a magnetic field H (broken line arrow) is generated as shown in the following equation (1). H=Ho・e ^j 〓 ^t ……(1) According to (1) above, the magnetic flux density B can be expressed as B=Bo・e ^j( 〓 ^t- 〓 ⁾ ……(2) In this case, A phase delay θ occurs due to energy loss. next,
The uniform magnetic field generated from the end face of the primary core 100 is
According to the law of magnetic flux continuity, the magnetic flux converges at the other end of the primary core 100. Here, the cross-sectional area of the secondary coil 103 is S
If the magnetic flux density at this position is Bs, then
The arriving magnetic flux Φ is Φ＝∫sBsds ……(3). Therefore, the electromotive force V generated in the secondary coil 103 is expressed by the following formula according to the law of electromagnetic induction. V=-NdΦ/dt (4) where N is the number of turns of the secondary coil 103. Next, when a coin is inserted between the primary coil 102 and the secondary coil 103, a loss of magnetic flux occurs.
This is because coins are metal, and the alternating current magnetization frequency
This is because when considering frequencies below 1 MHz, eddy current loss is a possibility. Also, the relationship between current density i→, electric field E→, magnetic flux density B→, and magnetic field H→ in a uniform medium is i→=1/ρE→ ……(5) B→=μH→ ……(6 ) i→=rotH→ ...(7) However, ρ is resistivity and μ is magnetic permeability. From Maxwell's electromagnetic equation, rotE→=−〓B/→/〓t...(8) is given. Considering a plane electromagnetic wave propagating in this medium, and taking the direction of propagation to the Z axis, the magnetic flux B becomes a function of Z, and from the above equations (5) to (8), the magnetic flux density B (Z) is However, μ _i is the initial magnetic permeability of the conductor, and Ho is the magnetic field at Z=0. Figure 2 shows how the magnetic flux density B attenuates.
The direction indicates the air layer, and the right (+) direction indicates the conductor layer. As shown in the figure, the magnetic flux B decreases exponentially as the depth from the boundary surface Z=0 (rightward) increases, and the phase lags as the depth increases. Here, the distance at which the attenuation of the magnetic flux B becomes 1/e is called the skin thickness δ, and is evaluated as a value through which the magnetic flux is effectively transmitted as shown in the following formula. Moreover, the electromotive voltage V generated in the secondary coil 103 is
As shown in equation (4), it is proportional to the magnetic flux B, but this magnetic flux B attenuates the next time a coin is inserted. Therefore, if we transform equation (9) by assuming the amount of change as ΔΦ and consider it in terms of amplitude, we get is given. However, S ₁ is the area where the magnetic flux B is blocked by the coin, and S ₁ = K・D・l (coin diameter D
x length l in the core width direction, K is a proportionality constant), and the magnetic permeability μo is μ _p =μ _i =4π×10 ^-7 [H/m] since the coin is a non-ferrous metal. , A=
If μ _p・H _p・K・l=constant, the above equation (11) becomes However, T is the thickness of the coin. It can be rewritten as Here, the material equivalent to the coin and the skin thickness δ corresponding to the frequency (thickness when the amplitude is 1/e)
shows.

[Table] Next, based on the above equation (12), the value ΔΦ ₁ proportional to the amount of change in magnetic flux B caused by the insertion of a coin is expressed as:
About frequency F, resistivity P, and coin thickness T An example will be described in which the calculation is performed as follows and a simulation is performed using a computer. Figure 3 shows simulation results showing changes depending on the material and coin thickness T when the frequency F is kept constant. Frequency F = 4KHz, resistivity P (copper:
1.7×10 ^-8 , aluminum: 2.6×10 ^-8 , cupronickel: 4.0
×10 ^-7 ), coin thickness T = 0 to 4 mm, coin diameter D = 33
mm condition, the vertical axis shows the electromotive force (V) of the secondary coil 101, and the horizontal axis shows the coin thickness Tmm. Here, 201 in the figure is copper, 202 is aluminum,
203 shows the characteristics of cupronickel. Fourth
The figure is a simulation result showing the change when the frequency is set to F=340KHz under the same material and coin thickness T conditions as in FIG. 3. On the other hand, Fig. 5 shows the simulation results when the coin thickness T is changed when the frequency F is made variable.
1MHz), resistivity P = (cupronickel: 4.0 × 10 ^-7 ), coin thickness T = 0 to 4 mm, and coin diameter (D) = 33 mm.
The vertical axis represents the electromotive force (V) of the secondary coil 103, and the horizontal axis represents the coin thickness Tmm. Here, 2 in the diagram
04 is 1KHz, 205 is 4KHz, 206 is 10KHz,
207 is 100KHz, 208 is 340KHz, 209 is
1MHz is shown respectively. Furthermore, Fig. 6 shows the simulation results when the coin diameter D is changed when the frequency F is made variable, and the frequency F=
(4KHz, 340KHz), resistivity P (1.7× for copper
10 ^-8 ), under the conditions of coin thickness T = 2.6 mm and coin diameter D = 33 mm, the vertical axis is the electromotive force (V) of the secondary coil 103,
The horizontal axis indicates the coin diameter D (mm). Here,
In the figure, 210 indicates 4KHz, and 211 indicates 340KHz. As described above, the simulation results shown in Table 1 and FIGS. 3 to 6 show that as the thickness of the coin increases, the amount of magnetic flux attenuation increases, and the smaller the resistivity ρ, the greater the change. Furthermore, it can be seen that as the angular frequency ω and the coin thickness T increase, the resistivity, that is, the influence of the hard material becomes smaller, and the output of the electromotive voltage is proportional to the coin diameter D. Therefore, the change in magnetic flux due to the coin can be expressed by the following function. ΔΦ=(ω, ρ, μ _i , T, D) ...(14) Figure 7 shows the relationship between the calculated values obtained by simulation and the actually measured values, and the figure shows the relationship between the calculated values obtained by simulation and the actually measured values.
In the case of 4KHz, the coin material is copper (characteristic ○ mark), brass (characteristic × mark), cupronickel (characteristic △ mark), coin size (point 300 is diameter D = 33 mm, thickness t = 2.6 mm, point 30
1 is diameter D = 26.5 mm, thickness t = 1.8 mm, point 302
is the diameter D = 20 mm, thickness t = 1.5 mm, point 303 is the diameter D = 15 mm, thickness t = 1 mm), the vertical axis is the measured electromotive force (V) of the secondary coil 103, and the horizontal axis is the actual electromotive force (V) of the secondary coil 103. 2
The calculated electromotive voltage (V) of the secondary coil 103 is shown. Also, Fig. 8 is for the case of frequency F = 340KHz,
The coin material and size are the same as in FIG. 7, the vertical axis shows the actually measured electromotive force (V) of the secondary coil 103, and the horizontal axis shows the coin diameter nominal value D (mm). Figures 7 and 8 show that the calculated values are close to the measured values and are in a proportional relationship, so even if the coin has not been measured, if its material, diameter, thickness, etc. are known, the theoretical value can be calculated. Becomes predictable. (Example of the invention) An example of the invention will be described below. FIG. 9 shows a schematic structure of a material sensor 33 used in this invention, and the material sensor 33 is created based on the principle of the material sensor described above. The material sensor 33 is composed of a U-shaped primary member 331 and a plate-shaped secondary member 332, and the sensor case is made of ceramic, polyphenylene sulfide (PPS) resin, etc., which has little change in shape due to temperature. . Primary member 331 and secondary member 332
Alternatively, a permalloy sheet may be attached to the entire periphery except for the hollow portion 334 provided for the coin passage so as not to be affected by the magnetic field from surrounding magnetic materials. Mounting protrusion members 333A and 333B provided on the protrusion of the primary member 331
Accordingly, the secondary member 332 can be coupled to the primary member 331, and by coming off and separating from the protruding members 333A and 333B, manufacturing, assembly,
This makes it easy to perform maintenance work to prevent coins from getting jammed in the sensor section. A rectangular hollow part 334 is provided in the center of the primary member 331, and two transfer belts 32 are mounted along with a conveyance path in the direction A in the figure within this hollow part 334.
The coin 400 is conveyed while being held between the conveyance belt 32 and the conveyance path, and the material, shape, and diameter of the coin 400 are detected as it passes through the empty space 334. FIG. 10 shows the internal structure of the material sensor 33, in which a primary core 60 is embedded in the primary member 331, and a primary coil 61 for excitation and a cancel coil 62 are wound around the primary core 60. By supplying a constant current AC excitation signal OS4 (described later) to the primary coil 61, an AC magnetic field KG is generated in the primary core 60, and based on this, an AC signal KS1 is sent to the cancel coil 62. is induced output. Further, a secondary core 63 is included in the secondary member 332.
is buried, and a secondary coil 64 is wound around the secondary core 63. The secondary core 63 is excited by the AC magnetic field KG generated in the primary core 60, and the secondary coil 64 has an AC magnetic field KG generated in the primary core 60. A signal NS1 is induced. FIG. 11 shows the block configuration of the circuit system of the coin identification device connected to the material sensor 33, in which a composite signal obtained by superimposing a low frequency signal (for example, 4 KHz) and a high frequency signal (for example, 340 KHz) is sent to the primary coil 61. The change in magnetic flux when the coin passes through the alternating current magnetic field KG in the empty space 334 is read, and the read alternating current signal is filtered to generate a low frequency signal and a high frequency signal. Detects the amount of change in the components, detects the material and shape of the coin with a low frequency signal, and detects the coin diameter with a high frequency signal,
Coins are identified by comparing them with pre-stored data on various coins. That is, the low frequency signal OS1 is output from the low frequency oscillation circuit 70, the high frequency signal OS2 is output from the high frequency oscillation circuit 71, the low frequency signal OS1 and the high frequency signal OS2 are each input to the amplifier circuit 72, and are amplified by the amplifier circuit 72. The superimposed composite signal OS3 is input to the constant current driver circuit 73. The composite signal OS3 is made into a constant current by the constant current driver circuit 73, and the constant current AC excitation signal OS4 is
is supplied to the primary coil 61 in the primary member 331,
An alternating current electric field KG is generated from the primary core 60. The alternating current magnetic field KG excites the secondary core 64 in the secondary member 332 and the cancel coil 62 in the primary member 331, and the alternating current signal NS induced in the secondary coil 64
1 is input to the amplifier circuit 74, and the AC signal NS2 amplified by the amplifier circuit 74 is passed through the bandpass filter 7.
5 and a low-pass filter 79. The bandpass filter 75 receives the input AC signal NS2.
to a certain range of frequencies (e.g. 330KHz to 350K
Hz), the extracted filtered signal NS3 is input to the amplifier circuit 76 and amplified, the amplified filtered signal NS4 is input to the half-wave rectifier circuit 77, and the half-wave rectified rectified signal NS5 is sent to the smoothing circuit. It is smoothed at step 78 and output. Also, the AC signal NS2 output from the amplifier circuit 74 is input to a low-pass filter 79, which filters the low frequency range of the AC signal NS2 (for example, 5KHz).
The passed filtered signal NS7 (below) is half-wave rectified by a half-wave rectifier circuit 80 and then smoothed, resulting in a smoothed signal
Output as NS9. On the other hand, the AC signal KS1 induced in the cancel coil 62 is transmitted to the amplifier circuit 82.
The signal KS input to the amplifier circuit 82 and amplified by the amplifier circuit 82
2 is input to a band pass filter 83 and a low pass filter 86, and a smoothed signal KS5 is outputted through a half wave rectifier circuit 84 and a smoothing circuit 85 similar to the output of the secondary coil 64, and a half wave rectifier circuit 87,
A smoothed signal KS8 is outputted via a smoothing circuit 88. The smoothed signals NS6 and KS5 output as described above are each input to an amplifier circuit 89, where they are differentially amplified and an identification signal SB1 for coin diameter identification is output. Also smooth signal SN9 and
The signals KS8 are each input to an amplifier circuit 90, where they are differentially amplified and an identification signal SB2 for identifying the material and shape of the coin is output. Identification signal SB1
and SB2 are input to the A/D converter 91,
The signals are converted into digital signals D1 and D2 by a predetermined timing clock TC controlled by the CPU 92. The digital signal D1 is sampled by the CPU 92 and sequentially stored in the RAM 94, and when the peak value of the digital signal D1 is detected by the CPU 92, the value of the digital signal D2 is also sampled in the RAM 94.
4 is stored. The ROM 93 stores digital signal values of coin denomination standard values (material, shape, coin diameter) as described later, and the CPU 92 compares the values stored in the RAM 94 with the denomination standard data. The denomination is determined. Figures 12 and 13 show denomination standard data for identifying the denominations of various coins in the United States and West Germany, respectively, and the data in the rectangular area in the figure is stored in advance in the ROM 93 as digital values. . Also, in the figure, the vertical axis is the secondary coil 6
Identification signal corresponding to low frequency signal induced by 4.
The output voltage (V) of SB2, the horizontal axis is the identification signal SB1 corresponding to the high frequency signal induced in the secondary coil 64
The output voltage (V) is shown. Number 12 shows an example of data for American coins, and area 21 in the figure
0 is 1 dollar coin (Material: 3 layers, cupronickel/copper/cupronickel,
Coin diameter: 26.5 mm, thickness 2 mm), area 211 is a 50 cent coin (Material: 3 layers, cupronickel/copper/cupronickel, coin diameter
30.61mm, thickness 2.18mm), area 212 is a 25 cent coin (Material: 3 layers, cupronickel/copper/cupronickel, coin diameter 24.26
mm, thickness 1.7 mm), area 213 is a dime coin (material: 3 layers, cupronickel/copper/cupronickel, coin diameter: 17.91 mm,
area 214 is a 5 cent coin (material: cupronickel, coin diameter 21.21 mm, thickness 1.98 mm), area 2
15 is a 1 cent coin (Material: Brass, Coin diameter:
19.05mm, thickness: 1.57mm).
Further, Fig. 13 shows an example of a West German coin, and the area 220 is a 5 mark coin (material: 3 layers, cupronickel/nickel/cupronickel, coin diameter: 29 mm, thickness: 2.07 mm).
mm), area 221 is a 2 mark coin (material: cupronickel,
Coin diameter 26.75mm, thickness: 1.79mm), area 222 is 1
Mark coin (material: cupronickel, coin diameter 23.5mm, thickness
1.75 mm), area 223 is 50 pfennig (material: cupronickel,
Coin diameter: 20mm, thickness 1.58mm), area 224 is 10 Pfennig (Material: 3 layers, brass/iron/brass, coin diameter 21.5
mm, thickness 1.7 mm), area 225 is 5 pfennig (material:
3 layers, brass/iron/brass, coin diameter 18.5mm, thickness 1.7
mm), area 226 is 2 pfennig (material: 3 layers, copper/
Iron/brass, coin diameter 19.25mm, thickness 1.52mm), area 2
27 indicates 1 pfennig (material: 3 layers, copper/iron/copper, coin diameter 16.5 mm, thickness 1.38 mm). Next, the operation of the coin identification device having such a configuration will be explained with reference to the flowchart of FIG. 14 and the waveform diagrams of FIGS. 15A to 15K. In the coin identification device, a low frequency signal (=4KHz) as shown in FIG. 15A is output from the low frequency oscillation circuit 70.
The OS1 is oscillated, and the high-frequency oscillation circuit 71 outputs a high-frequency signal (=340KHz) as shown in FIG.
2 are oscillated, input to the amplifier circuit 72 and synthesized, and input to the constant current driver circuit 73 as a superimposed composite signal OS3 as shown in FIG. 61 and is input from the primary core 60 to the secondary core 6
An alternating magnetic field KG is generated in the direction of 3. here,
When the coin 400 is conveyed on the coin path by the transfer belt 32 and passes through the hollow part 334 of the primary member 331, an alternating current input to the secondary core 63 is generated based on the material, shape, and diameter of the coin 400. The magnetic field KG changes. Note that FIG. 16 shows the change in strength of the cross section along the y-axis with the alternating magnetic field (magnetic flux B) input to the secondary core 63 (the strength also changes depending on the y-axis direction, but it is not uniform). The horizontal axis indicates the position of the secondary core 63, and the range MK indicates the length of the hollow portion 334 of the primary member 331. As shown in the figure, the alternating current magnetic field KG is uniformly distributed throughout the empty space 334, so the coin 400
The alternating current magnetic field KG changes uniformly no matter which part of the air space 334 it passes through. The alternating current signal NS1 induced in the secondary core 64 is amplitude-modulated by this change in the alternating magnetic field KG, and the amplitude-modulated alternating current signal NS1 is filtered as a high-frequency signal separated through the amplifier circuit 74 and the bandpass filter 75. It is input to the amplifier circuit 76 as a signal NS3,
The filtered signal NS shown in FIG. 15D is output from the amplifier circuit 76.
4 and is input to the half-wave rectifier circuit 77, where the rectified signal NS5 as shown in FIG.
The signal is then input to the smoothing circuit 78, smoothed, and output as a smoothed signal NS6 shown in FIG. or,
The amplitude-modulated AC signal NS2 is input to the low-pass filter 79, becomes the low-frequency filtered signal NS7 shown in FIG. After that, the signal is inputted to a smoothing circuit 81, smoothed as shown in J of the same figure, and output. By the way, the cancel coil 62
is wound around the primary core 60, and changes in the alternating current magnetic field KG due to coin passage have no effect. For this reason,
A signal KS1 corresponding to the AC signal OS4 as shown in FIG. 15C is directly induced into the cancel coil 62. Here, the cancel coil 6
The reason why 2 is used is to cancel changes in the DC bias component and to reduce common-mode noise components between the secondary coil output and the cancel output. Cancellation of the DC bias component here means that the output of the cancel coil 62 is set to the same level as the output of the secondary coil 64, and the level during standby when no coins are passing is brought close to 0V. The key is to take a large dynamic cleanse. Here, only the amplitude information is extracted and used, but if the secondary coil 64 and the cancel coil 62 are connected to cancel the DC bias component, normal amplitude information will be output due to the phase difference between the two. is not obtained. In addition, the reduction of common mode noise explained here refers to the reduction of induced noise in the low frequency signal band, induced noise caused by carrier waves and commercial power sources, etc. that cannot be filtered by the band pass filter 75 and low pass filter 79. It is. The AC signal KS1 from the cancel coil 62 is amplified by the amplifier circuit 82, and processed as the AC signal KS2 by the bandpass filter 83, half-wave rectifier circuit 84, and smoothing circuit 85 in the same manner as described above, and is converted into a smooth signal.
Output as KS5. This smoothed signal KS5 is
While the corresponding smoothed signal NS6 mentioned above has a minimum value PL1 as shown in FIG. 15F,
This smoothed signal KS5 does not have the minimum value PL1 because no change in the alternating current magnetic field KS is detected, and is at a flat constant voltage level throughout. Also, the AC signal KS2 is passed through the low-pass filter 86, the half-plate rectifier circuit 87, and the smoothing circuit 8 as described above.
8 and output as a smooth signal KS8.
This smoothed signal KS8 is also the corresponding smoothed signal
While NS9 has a minimum value PL3 as shown in FIG. 15J, it has a flat constant voltage level. The smoothed signals NS6 and KS5 are sent to the amplifier circuit 8.
9 and is differentially amplified and output as an identification signal SB1 having a peak value PL2 as shown in FIG. 15G. Further, the smoothed signals NS9 and KS8 are input to the amplifier circuit 90 and differentially amplified.
It is output as an identification signal SB2 having a peak value PL4 as shown in FIG. Identification signal SB1 and
SB2 is converted into digital signals D1 and D2 by the A/D converter 91, processed by the CPU 92, and stored in the RAM 94. Determination of the coin denomination by the CPU 92 is executed as shown in the flowchart of FIG. Peak values of characteristic values of identification signals SB1 and SB2
Since PL2 and PL4 are synchronized with the passage of the coin, the peak value of the identification signal SB2 can be read at the timing when the peak value of the identification signal SB1 is detected. First, the digital signal D1 of the identification signal SB1 is sampled at predetermined intervals by the CPU 92 (step S1), and it is checked whether there is a change of more than a predetermined level value (step S2). If it is a value (step S3), this sampling value is stored in RAM94.
The information is stored in sequence (step S4). and,
When a decrease in the sampling value is detected, this sampling value is determined as the peak value PL2 of the identification signal SB1 (steps S3, S5), the digital signal D1 is stored in the RAM 94, and at the same time the identification signal SB1 is
The digital signal D2, which is the peak value PL4 of 2, is also
The data is stored in the RAM 94 (step S6). and,
The CPU 92 reads coin denomination data as shown in FIG. 12 or 13 from the ROM 93,
Digital signal D1 stored in RAM94
The peak values of D2 and D2 are compared, the denomination is discriminated, and a discrimination signal HS is output (step S8). The discrimination signal KH is input to the coin sorting means, and the coins are sorted by denomination and stored separately. Also, ROM9
If the coin is not matched with the data stored in step 3, a signal is output as a discrimination signal KH to exclude the coin as not being genuine (step S8). Note that in the above embodiment, the excitation signal is low enough to affect the material and shape of the coin.
4KHz, and the high frequency excitation signal for detecting the diameter of the coin is 340KHz, but it is possible to change both frequencies as appropriate depending on the type of coin in the country where it is used and the characteristics shown in Figure 5. Furthermore, even without a detection system using the cancel coil 62, it is possible in principle to determine the denomination and authenticity of a coin. Fig. 17 shows the external appearance of an example of a coin dispensing device that can be applied to the material sensor described above, Fig. 17 shows the main part thereof, Fig. 19 shows the same plane, and Fig. 20 shows the same longitudinal section. The rotating disk 1 has a gentle conical shape at the center of its upper surface, and the center portion of the disk 1 is fixed to a central shaft 3 rotatably supported on the machine stand 2 side. On the periphery of this rotating disk 1 is a machine stand 2.
An annular fixed wall 4 supported by is disposed.
As shown in FIG. 18, the fixed wall 4 is approximately 1/2
A thickness regulating wall portion 6 in which the three-circumferential region
The regions Y and Z extending from the entrance of the coin passage 7 arranged in the tangential direction of the rotary disk 1 to the downstream side in the rotational direction of the rotary disk 1 are defined as notches 8 and 9. Especially notch part 8A of notch part 8 of area Y
The fixed wall portion where the coin passage 7 is formed extends from the upper surface of the rotating disk 1 to the passage bottom plate 7A that forms the passage bottom of the coin passage 7.
When the starting end portion of the passage bottom plate 7A is positioned on the upper surface of the notch portion 8A,
The upper surface of the passage bottom plate 7A is substantially flush with the upper surface of the rotary disk 1. Further, the fixed wall portion where the notch portion 8B is formed is flush with or slightly lower than the upper surface of the rotary disk 1 and the upper surface of the passage bottom plate 7A,
Coins that have not been fed into the entrance of the coin passage 1 are discharged outward. fixed wall 4
The portion where the notch 9 is formed in the remaining region Z is an inclined surface that slopes upward from the outside to the inside, as shown in FIG. A discharge notch 7C is formed between the terminal end 6B of the thickness regulating wall 6, which is the starting end of the notch portion 8A, and the starting end of the passage side plate 7B on the coin feeding direction side by the rotating disk 1 of the coin passage 7. When coins trying to enter the entrance section of the coin passage 7 are stagnated at the entrance section, some of the coins are ejected outward from the ejection notch 7C in front of the entrance section of the coin passage 7, and the coins are Coin jams due to stagnation of coins at the entrance of the passageway 7 are prevented from occurring. An outer disk 10 is provided on the outer circumference of the fixed wall 4 and constitutes a coin circulation means for circulating the coins C onto the rotating disk 1. This outer wheel disc 10
is placed in an inclined position so that the starting end 6A side of the regulating wall portion 6 of the fixed wall 4 is high and the ending end 6B side thereof is low, and the low part of the outer ring disc 10 (the part on the ending end 6B side) is located below the coin passage 7. Furthermore, a support member 1 is supported on the outer periphery of the boss portion 4B of the fixed wall 4 via bearings 11, 11.
The supporting member 12 and the outer ring plate 10 are combined. The outer circumferential edge of the outer ring disc 10 is supported by a plurality of support plates 15, 15... installed upright on the machine stand 2 side, respectively, and guide rollers 16, 16... (in this embodiment) are arranged annularly on the outer circumferential edge. In the example, it is installed at four locations every 90 degrees) and can be rotated. Therefore, after adjusting the degree of inclination of the outer race disc 10 with respect to the support member 12, the periphery of the outer race disc 10 is held by the guide rollers 16, 16, . . . to determine the inclination of the outer race disc 10. Further, with reference to FIGS. 18 and 19, a peripheral wall 17 having a constant radius supported by a support plate 15 (not shown) is provided around the outer race disc 10, and following this peripheral wall 17, the notch Starting end 9A of area Z of 9
A guide wall 18 is formed extending in an arc from the vicinity toward the terminal end 9B to approximately the center in the radial direction on the outer ring disc 10, and the thinnest coin C is placed at the tip of the guide wall 18.
The guide member 19 has a height that allows it to climb over the third layer and above.
are connected. The other end of this guiding member 19 is
The guide wall 18 and the guide member 19 constitute a guide guide 20, which is fixed near the end 9B of the notch 9 forming portion of the fixed wall 4. The guidance guide 20 extends in an arc from the vicinity of the lower end 9A of the notch 9 toward the terminal end 9B on the outer ring wall 10 inward in the radial direction.
The distance between the guide member 8 and the notch 9 forming portion of the fixed wall 4 becomes narrower toward the direction of rotation of the outer race disk 10. As a result, it is assumed that the coins on the outer circumferential side on the outer ring disk 10 and the coins on the inner side thereof will cause jamming between the guide wall 18 or the guide member 19 and the notch 9 forming part of the fixed wall 4. . Therefore, by making the portion of the fixed wall 4 where the notch 9 is formed an inclined surface, coin jamming can be eliminated and coins can be smoothly fed into the rotating disk 1. In the transmission system of the driving force to the rotating disc 1 and the outer ring disc 10, rotation is transmitted from a motor (not shown) through a pulley. Through the above mechanism, the circumferential speed of the outer circumferential edge of the rotating disk 1 is made to rotate at a circumferential speed that is equal to or faster than the circumferential speed of the inner circumferential edge of the outer disk 10 (near the fixed wall 4), and The coin is designed to be smoothly transferred onto the rotating disk 1. The coin passage 7, as schematically shown in FIG. 17,
A passage bottom plate 7A provided almost identically to the top surface of the rotating disk 1, and a coin gripping roller 31 provided above the entrance of the passage bottom plate 7A (on the boundary between the passage bottom plate 7A and each top surface of the rotating disk 1). , and a transfer belt 32 disposed on the downstream side of this gripping roller 31, and a material sensor 33 as described above is provided at a suitable position on this coin passage 7. The shaft 34 of the gripping roller 31 is supported by a bracket 36B fixed to the side of a support structure 36A that can be opened around a support shaft (not shown), and is connected to the pulleys 35A, 35A, . . . of the transfer belt 32, and each pulley 35A. , 35A between each presser roller 35
B, 35B are pivotally supported between two frames 36D, 36D fixed to the side of the support structure 36A on the passage 7 side by a plurality of fixing bars 36C, 36C, etc. Each pulley 35A, 35
Both ends of each shaft of A... and each presser roller 35B, 35B... are connected to a spring 3 inserted into each frame body 36D, 36D.
7, 37... are biased downward (toward the passage bottom plate 7A side), and can be moved up and down individually. The lower end of the circumferential surface of the grip roller 31, each pulley 35A, 35A..., each presser roller 35B, 35B.
...However, the lower surface of the transfer belt 32, whose height position is determined, is located at a height smaller than the thickness of the thinnest coin with respect to the upper surface of the rotating disk 1 and the upper surface of the passage bottom plate 7A, and the height position is determined according to the thickness of the coin. It is designed to rise to the thickness height. The above gripping roller 31
is the transfer belt 3 regardless of the difference in the diameter of the coin C.
In order to maintain an appropriate feeding interval between coins when delivering them to the coin C, an automatic transmission mechanism 38 is provided in which the rotational speed is automatically changed according to the thickness of the coin C held in the mouth. That is, when the coin C is thick, it is regarded as a large-diameter coin and the number of revolutions is increased, and when the coin C is thin, the number of revolutions is reduced and sent out. Support structure 36
On the shaft support piece 36E to which A is fixed, another shaft 42 is provided so that a piece 43 inserted therein is swingably supported by a horizontal shaft 44 in a direction perpendicular to the shaft 42. A tapered roller 45 having a taper in a direction opposite to that of the speed change roller 41 is fixed to the speed change roller 41 so that a part thereof comes into contact with the circumferential surface of the speed change roller 41, and a pulley 46 to which rotation is transmitted is attached to the other end of the shaft 42. is fixed. An elastic ring 47 made of a spring, rubber, or the like is wound around one end of the speed change roller 41 and the tapered roller 45 so that the two rollers 41 and 45 are always in contact with each other. Due to the elastic force of the elastic ring 47 and the maintenance of the contact state between the rollers 41 and 45, a counterclockwise rotational force is applied to the gripper roller 31 around the shaft 40, but it is fixed to the piece 39. Due to the contact with the stoppers 39a and 39b, the gripping roller 31 is positioned at a height lower than the thickness of the thinnest coin. Therefore, if the coin C that enters under the gripping roller 31 is thick, the gripping roller 31 will be pushed up significantly, so the contact point between the speed change roller 41 and the taper roller 45 will shift to the left in the figure, and the taper roller The large diameter side of the speed change roller 45 contacts the small diameter side of the speed change roller 41 to increase the speed and transmit rotation to the gripping roller 31. In the case of thin coins, on the other hand, the amount of push up by the gripping roller 31 is small, and the small diameter side of the tapered roller 45 and the speed change roller 4
1 comes into contact with the large diameter side of the gripping roller 31, and the rotation is transmitted to the gripping roller 31 at a reduced speed. In the above embodiment, the circumferential speed near the outer peripheral edge of the rotating disk 1 is V1, and the gripping roller 31 is
When the circumferential speed of the moving belt 32 is V2x (the value of V2x changes depending on the thickness of the coin) and the circumferential speed of the moving belt 32 is V3, the speed relationship is V3>V1>V2x. As a result, the coin about to be sent out from the rotating disk 1 is gated by this gripping roller 31, and the peripheral speed of the gripping roller 31 is V2.
It is sent to the transfer belt 32 side at x. When subsequent coins are stagnated at the entrance of the coin passage 7 due to the gating action of the gripping roller 31, some of the coins are ejected from the ejection notch 7C and the notch portion 8B, and are not deposited at the entrance. Coin stagnation will be resolved. The distance between the gripping roller 31 and the pulley 35A at the starting end of the transfer belt 32 is approximately 20 mm in this embodiment, and for coins with a diameter of 20 mm or more, the leading edge of the coin is at the position of the pulley 35A at the starting end. While the coin is gripped under the transfer belt 32, the trailing edge of the coin is gripped by the gripping roller 31. In this state, the coin is transported at the peripheral speed V2x of the gripping roller 31, and only when the trailing edge of the coin comes off from the gripping roller 31 is the coin transported at the peripheral speed V3 of the transport belt 32. In other words, while the coin is being held by the gripping roller 31, even if a part of the coin is in contact with the rotating disk 1 or the transfer belt 32, the coin is fed by the circumferential speed V2 of the gripping roller 31 x the coin diameter. Since the circumferential speed V2x of this gripping roller 31 is changed according to the coin thickness, which is proportional to the coin diameter, the distance between the centers of the coins fed between the transfer belts 32 is constant regardless of the coin diameter. The above is guaranteed. This center-to-center distance dimension is larger than the pitch dimension of the coin receiving recesses 30a, 30a... formed in the sorting disk 30 that continuously rotates at the same speed as the transfer belt 32. Two coins are prevented from entering one section 30a at the same time. However, the recessed portions 30a, 3 of the sorting disk 30
It is not necessary to always insert coins one by one into 0a..., and even if there is a depression 30a into which no coins are inserted, there is no problem with the coin sorting operation. Next, the operation of the coin sending device will be explained. The coins C supplied onto the outer wheel disk 10 through the supply disk 50 are sent by the rotation of the outer wheel disk 10 in the direction of the arrow, and are brought toward the rotating disk 1 side along the guide wall 18. At this time, the thinnest coins within the second layer are fed onto the rotating disk 1 from the inclined surface 9 of the fixed wall 4 along the guide member 19. Further, the thinnest coins in the third layer and above are returned to the outer wheel disk 10 by passing over the guiding member 19. The coins C that have entered the rotating disk 1 move along the inner circumference of the fixed wall 4 due to centrifugal force, and the coins in the second and higher layers in the region X of the regulating wall 6 are sent out onto the outer disk 10 again. Only the first layer coins enter the coin passage 7 through the cutout portion 8A corresponding to the entrance of the coin passage 7. When several coins are stuck at the entrance of the coin passage 7, some of the coins are discharged from the discharge notch 7C to the outer wheel disc 10, and also pass through without entering the entrance of the coin passage 7. The coins are sent to the outer disc 10 from the notch part 8B or the notch part 9, the amount of coins present at the entrance of the coin passage 7 is reduced, and the coins are smoothly fed into the coin passage 7. The coin entering the coin passage 7 is pressed by the upper surface of the gripping roller 31, and as described above, the coin is transferred to the transfer belt 32 by rotation of the gripping roller 31.
Coins that are sent to the side and enter the lower surface of the transfer belt 32 are sent downstream due to friction with the belt 32. On the other hand, from the regulating wall part 6 of the rotating disc 1 to the outer disc 1
The coins from the second layer or higher that overflowed onto the top layer 0 and the coins ejected from the ejection notch 7C, the notch part 8B, and the notch part 9 reach the guide wall 18 again by the rotation of the outer wheel disc 10, and are removed by the guide member 19. It is fed onto the rotating disk 1 again. As a result, rotating disk 1
Approximately equal amounts of coins are always dispersed on the upper and outer wheel discs 10 to ensure more reliable delivery to the coin passage. When the amount of coins on the outer wheel disk 10 increases and the coin amount detection switch 48 is activated, the supply disk 50 is stopped and the supply of coins is cut off, so that a certain amount of coins remains on the rotating disk 1 and the outer wheel disk 10. done to. The authenticity and denomination of the coins on the coin path 7 are determined by a coin identification device based on the output of the material sensor 33. And the discrimination signal KH is RAM94
The coin is stored in sequence in the material sensor 33.
Based on the discrimination result of the coin in the RAM 94 from the time the coin passes through the coin receiving recess 30a, the coin is stored in the corresponding storage section 100A, 100B, 1
It is controlled to be stored in one of 00C, . . . . FIG. 17 shows two storage parts 100A and 100B.
Although only one coin is shown, there are multiple storage compartments (this will be determined as appropriate based on the number of denominations in each country. A fixed number common to each country will be provided. Also, it will be used to store one counterfeit coin.) For example, when the coin is a coin to be stored in the storage section 100B, the amount of rotation of the sorting disk 30 is detected, and when the coin reaches the hole 101B, a solenoid or the like is activated from below the hole 101B. A protruding piece (not shown) is then protruded to sort and store the coins in the storage section 100B. With just a slight protrusion, the coin will fly out due to centrifugal force and be stored. The current position of the coins entering the recessed portion 30a one after another is determined by the amount of rotation of the sorting disk 30, and the coins are surely sorted when they reach a place to be sorted and stored. The amount of money (counterfeit money) stored in each storage section 100A, 100B, . . . can be freely changed by simply changing the software. (Modification of the invention) In the above embodiment, the primary member and the secondary member of the material sensor are
Attachment and detachment with the next member was made using the mounting protrusion provided on the primary member, but the 21st member
As shown in the figure, a primary member 331 and a secondary member 33
2 may be fixed at one end with a hinge 335 so that it can be opened and closed in the R direction in the figure. Further, as shown in FIG. 22, a projection member 337A is provided on the secondary member 332.
and 337B are fixedly provided, and spring members 336A and 336B are inserted, and a plate-shaped presser member 338 is provided above and this presser member 338
are the protruding members 337A and 337B, and the spring member 33.
6A and 336B, and by pressing and holding the presser member 338 with a fixing member (not shown) provided in the coin identification device, the presser member 338 is constantly pressurized in the direction Q shown in the figure. , the primary member 331 and the secondary member 332 may be prevented from shifting due to vibration or the like. (Effect of the invention) As described above, according to the material sensor in the coin processing machine of this invention, since the width of the primary coil and the secondary coil is wider than the coin passage, it is difficult to determine which position in the coin passage the coin passes through. can also be determined reliably. Also 1
Since the next member and the secondary member are removable, the coin passage can be easily inspected. In addition, by simply changing the standard settings for coins stored in the storage means of the coin identification device connected to the material sensor by changing the software, it is possible to easily detect coins from each country with a single material sensor. Play coins.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the principle of a material sensor which is an embodiment of this invention, Fig. 2 is a diagram showing the state of magnetic flux density attenuation, and Figs. 3 to 5 are simulation diagrams of the material sensor and a coin. Figures 6 to 8 are diagrams showing the relationship between the measured values and simulation values, Figure 9 is a schematic diagram of the material sensor, Figure 10 is a diagram showing its internal structure, and Figure 11 is the circuit of the coin identification device. Figure 12 shows the denomination standard data of American coins, Figure 13 shows the denomination standard data of West German coins, and Figure 14 shows the coin discrimination operation of the coin identification device. The flowchart to be explained is as follows: Figures 15A to 15K are waveform diagrams of each circuit in the coin identification device, Figure 16 is a diagram showing the strength of the alternating current magnetic field input to the secondary core, and Figure 17 is a diagram showing the strength of the alternating current magnetic field input to the secondary core. An external view, FIG. 18 is a diagram showing the main parts, FIG. 19 is a plan view, FIG. 20 is a vertical cross-sectional view, and FIGS. 21 and 22 are other examples of the material sensor. FIG. DESCRIPTION OF SYMBOLS 1...Rotating disk, 4...Fixed wall, 6...Regulating wall part, 7...Coin passage, 8...Notch part, 9...Notch part, 10...Outer wheel disc, 16...Guide roller, 1
7... Peripheral wall, 20... Guidance guide, 31... Gripping roller, 17... Surrounding wall, 20... Guidance guide, 31... Gripping roller, 32... Transfer belt, 33... Material sensor, 38... ... automatic transmission mechanism, 41 ... speed change roller, 45 ... cone roller, 60 ... primary core, 61 ... primary coil, 6
2...Cancel coil, 63...Secondary core, 6
4...Secondary coil, 70...Low frequency oscillation circuit, 7
1...High frequency oscillation circuit, 72, 74, 76, 8
2, 89, 90... Amplifier circuit, 73... Constant current driver circuit, 75, 83... Band pass filter, 77, 80, 84, 87... Half wave rectifier circuit,
78, 81, 85, 88...smoothing circuit, 91...
A/D converter, 92...CPU, 93...
ROM, 94...RAM.

Claims (1)

[Scope of utility model registration request] In a coin processing machine that forcibly transports coins on a passage surface using a transport belt and detects the denomination and authenticity of the transported coins using a material sensor, the material sensor is wound around a primary core and the primary core. a primary member bent in a U-shape from the passage surface to the inner surface thereof;
A secondary coil is embedded in the primary member and is wound around the secondary core and detects the denomination and authenticity of the coin by the output induced when the coin passes through the passage surface. 2 removable plate shapes
1. A material sensor for a coin processing machine, characterized in that the conveyor belt is passed through an empty space between the primary member and the secondary member.