JPH0464006A - Discriminating apparatus for diameter of circular object - Google Patents

Abstract

PURPOSE:To correctly detect the diameter of a circular object in a simple constitution by providing two detecting means in a direction intersecting the moving direction of the object on the road, and detecting the diameter of the object on the basis of the detecting states of the two detecting means. CONSTITUTION:A circular object 11 moving on a road 12 is detected by a first and a second detecting means 14, 15 provided in a direction intersecting the moving direction of the object. The time while the object 11 is detected by the means 14, 15 is counted by a first and a second timer means 51, 52. The diameter of the object 11 is determined by an operating/controlling means 21 on the basis of the counted values alpha0, beta0 by the means 51, 52.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a diameter determining device for determining the diameter of a circular object such as a coin.

(Prior Art) Conventionally, as a device for determining the diameter of a circular object such as a coin,
For example, Japanese Patent Application Laid-Open No. 58-13288, which was previously proposed by the present applicant.
There is an invention described in Publication No. 4. In this proposal, as shown in FIG. 8, an image sensor 1 in which photoelectric conversion elements are arranged horizontally in a row is arranged on both sides of a passage 3 through which a circular object 2 passes, in a state perpendicular to the transport direction. The sum of the numbers of photoelectric conversion elements of the image sensor 1 that are shielded by 2 is determined by an adding circuit, and a maximum value storage circuit for storing the maximum value of the output of the adding circuit is provided.
While the circular objects 2 are passing through the image sensor 1,
The operation of comparing the output value of the adder circuit with the value of the maximum value storage circuit and storing the larger one in the maximum value storage circuit is repeated. Therefore, after the circular object 2 finishes passing, the diameter of the circular object 2 can be determined based on the value stored in the maximum value storage circuit and the distance between the pair of image sensors 1.

In this way, as the conventional device for determining the diameter of a circular object, there is no need to restrict the circular object 2 to one side of the passage 3, and
There is known an apparatus that does not require timing for reading the image sensor 1 while the circular object 2 is moving through the passage 3, and can accurately determine the diameter.

(Problem to be Solved by the Invention) However, although a device for determining the diameter of a circular object as described above is known, the conventional device requires the use of a photoelectric converter in which photoelectric conversion elements are arranged in a row as a sensor. Not,
Furthermore, as already mentioned, while detecting a circular object, the photoelectric converter must be scanned many times to extract the maximum value from the detected values. Therefore, the sensor used to determine the diameter must be large-scale, and the signal processing and data processing, such as the scanning operation of the photoelectric converter and the operation of extracting the maximum value from the values detected by the scanning operation, are complicated. The problem was that it became

The present invention has been made in view of these points, and includes two detecting means provided on the path in a direction crossing the direction of movement, and based on the detection status of these two detecting means, the diameter of a circular object is determined. By determining the diameter of a circular object, there is no need to limit the circular object to one side of the passage, there is no need to time the reading of the detection means, and the diameter can be accurately determined with a simple configuration and processing. The purpose is to provide a device.

[Structure of the invention]

(Means for Solving the Problems) The invention according to claim 1 provides a path 12 in which the circular object 11 moves, and a pair of paths 12 provided in a direction intersecting the direction of movement of the circular object 11, so that the circular object 11 moves on the path I2. A first detection means 14 and a second detection means 15 that detect a circular object 11;
A first clock means 51 measures the period during which the first detecting means 14 detects the moving circular object 11, and a first clock means 51 measures the period during which the second detecting means 15 detects the moving circular object 11. A calculation control that determines the diameter of the circular object 11 based on a second time measurement means 52 that measures time, a first time value measured by the first time measurement means 5I, and a second time value measured by the second time measurement means 52. This is an apparatus for determining the diameter of a circular object, comprising means 21.

The invention of claim 2 provides a passage 12 through which the circular object 11 moves, and a pair of first passages provided on the passage 12 in a direction intersecting the direction of movement to detect the circular object 11 moving on the passage 12. a detection means 14 and a second detection means 15;
a signal generating means 27 for generating a signal in response to the circular object 11 moving a predetermined distance on the passage 12;
a first counting means 32 for counting the number of signals generated by the signal generating means 27 while the detecting means 14 detects the moving circular object 11; a second counting means 33 for counting the number of signals generated by the signal generating means 27 while detecting II; and a count value by the first counting means 32 and a count value by the second counting means 33. This is an apparatus for determining the diameter of a circular object, comprising arithmetic control means 21 for determining the diameter of the circular object 11 based on the following.

(Function) In the invention of claim 1, the circular object 1 moving on the passage 12
1 by a pair of first detection means 14 and second detection means 15 provided in a direction intersecting the direction of movement thereof,
The period during which the first detection means 14 and the second detection means 15 are detecting the circular object 11 is measured by the first time measurement means 51 and the second time measurement means 52, respectively, and the first time measurement means 5I The first time measurement value and the second time measurement means 52
In the invention of claim 2, the arithmetic control means 21 characterizes the diameter of the circular object 11 based on the second time value measured by
1 by a pair of first detection means 14 and second detection means I5 provided in a direction intersecting the direction of movement thereof,
At this time, the signal generating means 27 generates a signal in response to the circular object 11 moving a predetermined distance on the passage 12, and the first detecting means 14 and the second detecting means 15 detect the circular object 11. The number of signals generated by the signal generating means 27 during detection is counted by the first counting means 32 and the second counting means 33, and the counted value by the first counting means 32 and the second counting means are calculated. 33, the arithmetic control means 21 determines the diameter of the circular object 11.

(Embodiment) Hereinafter, the configuration of an embodiment of the present invention (corresponding to M requirement 2) will be described with reference to FIGS. 1 to 4.

1 and 2 show a passage structure through which a circular object moves. A conveyor belt 13 is stretched over a passage 12 through which a circular object 11 such as a coin is moved. The circular object 11 is gripped by the conveyor belt I3 and is held in the passage 12 by the conveyor belt 13.
Convey by sliding on the top. In this passage 12, a first detection sensor 14 as a first detection means and a second A second detection sensor I5 is provided as a detection means for each detection sensor 14. Is has light receivers 16 above and below the passage 12.
It consists of a light emitting/receiving type detection sensor equipped with a light emitter +6b and a light emitter +6b, and detects the circular object 11 by blocking the detection light by the circular object 11 moving in the passage 12.

FIG. 3 shows a block configuration diagram of the diameter discrimination device, which has a CPU 21 as an arithmetic control means for diameter discrimination control, and this CPU 2+ has a ROM 22 and data that stores programs, diameter reference values for each denomination, etc. A RAM 23 is connected thereto, and an input/output port 24 is connected thereto, through which data for determining the diameter can be obtained.

Next, the configuration and operation for the CPU 2+ to obtain data for diameter determination through the input/output port 24 will be explained.

When a drive command is output from the input/output port 24 to the motor control circuit 25, the motor 26 is driven and the conveyor belt 13 is rotationally driven. The rotation of the motor 26 is detected by a rotary encoder 27 as a signal generating means, and the rotary encoder 27 conveys the circular object 11 in the passage 12 by 0.11 as shown in FIG. 4(b). A signal P of one pulse is generated every time.

In addition, each detection sensor 14. 15, each time the circular object 11 moving in the passage 12 is detected, the circular object 11 is converted into a detection signal S1 corresponding to the detection width through each waveform shaping circuit 28, 29, as shown in FIG. 4(b). ° S2 is generated respectively.

The pulse signal P from the rotary encoder 27 is input to one input terminal of each AND circuit 30.31 of the pair, and the detection signals Sl, S2 from each waveform shaping circuit 28.29 are input to the other input terminal. From the AND circuits 30, 31, pulse signals S3, . Output S4 respectively.

Furthermore, signals S3°S4 from each AND circuit 30.31
is the first counting circuit 32 and the second counting circuit 32 as the first counting means.
The pulse numbers are input to the second counting circuit 33 as a counting means, and each counting circuit 32 and 33 counts the number of pulses to obtain each counted value α. , β0 are output to the input/output port 24, respectively. Note that a clear signal for clearing the counted value is input to the CLR terminal of each counting circuit 32, 33, respectively.

In this way, the CPU 2+ receives the count value α from each counting circuit 32 and 33 as data for determining the diameter through the input/output port 24. ,β. is input. Then, the CPU 21 calculates the count value α. ,β. is stored in the RAM 23, and αo xQ
, 1 mm, βoxo, and 1 m1u, distance values α and β of the circular object 11 detected by each detection sensor 14.15 are calculated and stored in the RAM 23.

Next, the circular object 11 is determined by the CPU 21 from the values of α and β.
The process of determining the diameter of the diameter will be explained. In this example, we will perform calculations (Equations (1) to (14)) to find the numerical value to be entered into the formula (15) for a circle, which will be described later, and the diameter formula (
22) Calculation to find the numerical value to be put in (f15) ~ (2+)
) can be broadly divided into

As shown in FIG. 4(a), each detection sensor 14
．． Detection starting point A (xo.

yo), C(X2. yl) and detection end point B (x+
.

yo) and D(X3.yl) in the coordinate system,
The following equations (1), (2), and (3) hold true.

x, -Xo=α...(1)x3
−X,=β...(2)Y+
To = γ...(3) In addition, α
is the count value α of the first counting circuit 32. Point AB obtained from
and β is the count value β of the second counting circuit 33. The distance between points CD, γ, obtained from the detection sensor 14. 15 distance.

Here, to simplify calculation, (xo, yo) = (0
, 0), the following equations (4), (5), and (6) hold true.

xl −α ・・・・・・(
4) x3-X2=β ・・・・・・
(5) V+=γ・・・・・・
・(6) Also, since it is a circle, the following equation (7) holds true.

X2-X, -x3...(7
) Substitute the above equation (4) into this equation (7).

X 2 − α −X3 ,', x2+x3=α ・・・・・・(
8) Also, calculate equation (5) + equation (8).

2x, =α+β 1'-X3=(α+β)/2 ・・・・・・(
9) Also, calculate equation (8) - equation (5).

2x2=α-β,'-X2=(α-β)/2 ・・・・・・(
10) The above can be summarized by the following formulas (11) to (14).

XI = α ・・・・・・(
11)X2=(α-β)/2...
・(12)X3=(α+β)/2 ・−・・
・(13)y,=γ...
(14) Next, since it is a circle, the following equation (15) holds true.

(x-a) + Cy-b) =c" =
-115) Note that a and b are the center coordinates (a, b) of the circle, and C is the radius of the circle.

Then, in equation (15), point A(0,0), point B(x,,O
) and point C (x2.yl), the following f
16) (17) Equations [18] are obtained.

a2+b'=c"...1
16) (x+-a)'+b' =c2 --=(I
T) (X2-8) 2+ (yl -b) = (2・
...(18) Then, calculations of equations (17) to (16) are performed.

X H' 2 a X H= 0,', a = x, / 2
------- f19) Also, formula (18) -
Calculate equation (16).

X2 2ax2+'/I 2by+ =0,',
b= I/2y+ (X2 -2ax2+y+ 2)
1/2y+ (X2 XI X2 + + '
)...(2G) Also, substitute ()1) to (14) into equation (20).

As a result, the center of the circle (a, b) is found, and the following (19
) f21) is shown by the formula.

a=α/2 (1
9) b=γ/2-(α2-β2)/8γ・・・・・・(
21) Therefore, the radius C of the circle can be found as follows: C=f1Tk7-, and the diameter can be found using the following equation (22).

D=2v'-7T lower 7 ・・・・・・(
22) As described above, the CPU 2+ calculates the diameter from the values of α and β, and compares this diameter value with the reference value for each denomination stored in the ROM 22 to determine the authenticity and denomination. be able to.

Next, another embodiment of the present invention (corresponding to claim 2)
will be explained with reference to FIGS. 5 and 6.

In this embodiment, the detection signal S II+ 312 (FIG. 6(b)) from each waveform shaping circuit 28, 29 is input to the exclusive OR circuit 41, and from this exclusive OR circuit 41, the signal 513 (the 6 (C)) is output.

Then, the detection signal 3+1 from the waveform shaping circuit 28 is inputted to one AND circuit 30, and from this AND circuit 30, the signal S, 4 (FIG. 6(d)) is inputted to the first counting circuit 32. Count value α from the first counting circuit 32. is input to the CPU 21 through the input/output port 24.

On the other hand, the signal SI3 from the exclusive OR circuit 41 is input to the other AND circuit 31, and the signal S1. (FIG. 6(d)) is input to the second counting circuit 33, and from this second counting circuit 33, the count value β is input. ' is input to the CPU 2+ through the input/output port 24.

Then, the CPU 21 calculates the count value α. ,β.

Distance conversion (α.' ×0, l mm, β. ×0.1
+nm) for each detection sensor 14. The distance values α' and β' of the circular object 11 detected in step 15 are calculated.

Next, a process for determining the diameter of the circular object 11 by the CPU 21 from the values of α and β' will be described.

In this example, the formula (37) for being a circle, which will be described later, is used.
Since the numerical value to be inserted into the diameter formula (44) can be directly obtained, the calculations for that purpose (formulas (1) to (14) in the above embodiment) can be omitted, and the calculation to calculate the numerical value to be inserted into the diameter formula (44) ((
The diameter of the circular object 11 can be determined by performing only steps 3g) to (43)).

As shown in FIG. 6, each detection sensor 14, 15
The detection starting point A of the circular object 11 by (xo.

To), C(X21Ml) and the detection end point B(x,.

yo) and D (X3.y+) in a coordinate system, the following equations (31), (32), and (331) hold true.

xI−xo=α (31
) x2−Xo=β′ ・・・・・・(
32) VI3'o = γ...
・(33) Note that α′ is the count value α of the first counting circuit 32
. The distance between points AB obtained from , β' is the count value β of the second counting circuit 33. The distance between points CD obtained from γ
is the detection sensor 14. The distance is +5.

Here, to simplify calculation, (xo, yo) = (0
, 0), the following equations (34), (35), and (36) hold true.

x, = α′ ・・・・・・(3
4) x2=β' ・・・・・・
(35)VI=γ・・・・・・
-(36) Also, since it is a circle, the following equation (37) holds true.

(x-a) 2+ (y-b) =c2---(3
7) Note that a, b are the center coordinates (a, b) of the circle, and C
is the radius of the circle.

Then, in equation (37), point A(0,0), point B(x,,0
) and point C(X2.y+), the following equations (38), (39), and (40) are obtained.

a' ten b2=c2 ・=-138)(
x, -a) +b2=c' -・-139) (
X2 a) + (y+ b) = c2...
... (40) Then, calculate +39) - (38).

x, -2ax+ = 0 pa・a = x + / 2 = α /2 ... (41) Also,
(401-(38) is calculated.

x2 −2ax2 +y+ 2bY+ =0,'
, b= l/2y+ (X2 2ax2+y l
” )=1/2γ(β′ −α′ β′+72)...
...(42) Also, by equations (38) (41) (42), the following (
43) Equation is shown.

c=f] 17 Cor 7 ・・・・・・(43) Therefore, the diameter can be determined using the following equation (44).

(44) In the above embodiment, the case of α≧β was shown, but α<<
In the case of β, X2-Xn = -β' in equation (32), so in equation (35), X2 = -β'.As described above, CPU2+ is The authenticity and denomination can be determined by comparing this diameter value with a reference value for each denomination stored in the ROM 22.

In the embodiment described above, the conveyance distance of the circular object 11 is detected by the pair of detection sensors 14 and 15 to determine the diameter, but the circular object 11 is conveyed at a constant speed,
The period during which the detection sensors 14 and 15 detect the circular object 11 may be counted, and the diameter may be determined based on this timed value. That is, the embodiment in this case (Claim 1
As shown in FIG. 51 and a second clocking means 51, the first
The first time value α by the time measurement means 51. and a second time value β by the second time measurement means 52. Circular object 11 based on
The calculation control means 21 determines the diameter of the circular object 1 by determining the diameter of the circular object 1.
The distance value (α, β) is obtained from the transport speed of 1, and the diameter can be determined by performing calculations as described above.

In the above embodiment, the signals of the signal generating means are simply counted, but the number of signals is counted separately for each of the forward and reverse rotations of the motor, and the number of signals for the forward rotation is calculated from the number of signals for the reverse rotation. By configuring the first and second counting means using the count value obtained by subtracting the number of signals, the diameter can be reliably determined even when the motor is temporarily reversed.

〔Effect of the invention〕

According to the invention of claim 1, a circular object moving on a passage is detected by a pair of first detection means and second detection means provided in a direction intersecting the direction of movement of the circular object, and the first detection means The period during which the means and the second detecting means are detecting the circular object is measured by the first time measuring means and the second time measuring means, respectively, and the first time value by the first time measuring means and the second time value are
The diameter of the circular object can be determined by the arithmetic control means based on the second time value measured by the time measuring means, and there is no need to restrict the circular object to one side of the passage, and it is not necessary to time the reading of the detection means. Therefore, the diameter can be determined accurately with a simple configuration and processing.

According to the invention of claim 2, a circular object moving on a passage is detected by a pair of first detecting means and second detecting means provided in a direction intersecting the direction of movement of the circular object, and at this time, the circular object The signal generating means generates a signal in response to the object moving a predetermined distance on the path, and the signal generating means generates a signal while the first detecting means and the second detecting means are detecting the circular object. The first counting means and the second counting means each count the number of signals to be detected, and the arithmetic control means determines the diameter of the circular object based on the counted value by the first counting means and the counted value by the second counting means. It is not necessary to restrict the circular object to one side of the passage, and there is no need to time the reading of the detection means, and the diameter can be accurately determined with a simple configuration and processing.

[Brief explanation of drawings]

FIG. 1 is a plan view of a passage showing an embodiment of the device for determining the diameter of a circular object according to the present invention (corresponding to claim 2), FIG. 2 is a side view thereof, and FIG. 3 is a configuration diagram. Figure 4 (a) is an explanatory diagram showing the coordinate system of a circular object on the passage, and (b)
(c) is a waveform diagram, FIG. 5 is a configuration diagram showing another embodiment of the present invention (corresponding to claim 2), and FIG. 6 (1) is a coordinate system of a circular object on the passage. (b) (c) (d) are waveform diagrams, FIG. 7 is a configuration diagram showing still another embodiment of the present invention (corresponding to claim 1), and FIG. FIG. 2 is a plan view of a conventional device. 11...Circular object, 12...Pathway, 14...Detection sensor as first detection means, 15...Detection sensor as second detection means, 21...CPU as calculation control means
, 27... rotary encoder as signal generating means, 32... counting circuit as first counting means, 33...
A counting circuit as a second counting means, 51...first timekeeping means, 52...second timekeeping means. Σ-J IU”

Claims (2)

[Claims] (1) A path through which a circular object moves; and a pair of first and second detection means provided on this path in a direction intersecting the direction of movement, and which detect the circular object moving on the path. , a first timer for timing a period during which the first detection means is detecting a moving circular object; and a second timer for timing a period during which the second detection means is detecting a moving circular object. a clocking means; and the first clocking means.
A device for determining the diameter of a circular object, comprising: arithmetic control means for determining the diameter of the circular object based on a first time value measured by the time measurement means and a second time value measured by the second time measurement means. . (2) A path through which the circular object moves; and a pair of first and second detection means provided on the path in a direction intersecting the direction of movement, and which detect the circular object moving on the path. , a signal generating means for generating a signal in response to the circular object moving a predetermined distance on the path; and a signal generating means generating the signal while the first detecting means is detecting the moving circular object. a first counting means for counting the number of signals generated by the signal generating means while the second detecting means is detecting a moving circular object;
A diameter of a circular object, characterized in that it comprises a counting means, and an arithmetic control means for determining the diameter of the circular object based on the counted value by the first counting means and the counted value by the second counting means. Discrimination device.