JPH0344793A - Sheet paper or the like discriminating device - Google Patents

Abstract

PURPOSE:To easily obtain true width data by executing addition and subtraction processing to width data to be calculated from the measured results of breadthwise direction detecting means which detect the right and left end parts of a sheet paper or the like. CONSTITUTION:Based on detecting signals obtained from breadthwise direction detecting means IL and IR, detection data are obtained concerning the first preceding corner part of a front edge in a sheet paper or the like P to be conveyed and afterwards, detection data are obtained concerning the second following corner part of the front edge. On the other hand, during time corresponding to time difference from the acquisition of the detection data concerning the first corner part to the acquisition of the detection data concerning the second corner part, detection data are obtained by the breadthwise direction detecting means IL or IR concerning the side edge part of the paper sheet P to be extended from the first or second corner part in the back of the conveyance. Based on the detection data concerning the first and second corner parts and detection data concerning the side edge part the true breadthwise dimension of the sheet paper or the like to be conveyed is calculated. Thus, the exact breadthwise dimension can be calculated by simple processing.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a paper sheet discriminating device for discriminating paper sheets such as banknotes. On the other hand, the present invention relates to a paper sheet discriminating device that can accurately determine the widthwise dimension of paper sheets even when the paper sheets are conveyed in an oblique state.

"Conventional technology" Hereinafter, it will be explained as a paper banknote.

As one method for determining the denomination of a banknote, conventionally, the external dimensions of the banknote (the dimension in the direction of movement of the banknote is called the length dimension, and the dimension in the direction perpendicular to the direction of movement of the banknote is called the width dimension) It is then carried out to measure the value of a + a + - (hereinafter referred to as a) and compare it with a reference value.

For example, in Japanese Patent Application Laid-Open No. 54-121761, two charging detectors arranged along the width direction of the banknote are used to determine the distance between the two photoelectric detectors and the distance based on the difference in the detection time of the banknote. On the other hand, from the longitudinal dimension of the banknote in the photoelectric detector (dimension based on the detection time of the banknote) and the obtained diagonal angle, use trigonometric functions to find the true length dimension. I was calculating.

Applying this technology, we use a line-shaped sensor that can detect the position of a banknote in the width direction to detect the distance based on the difference in the detection time of the banknote at two specific positions in the width direction. It has been considered to obtain the angle and calculate the true width dimension using trigonometric functions from the dimension in the width direction of the banknote detected by a linear sensor and the obtained oblique angle.

"Problem to be Solved by the Invention" However, when performing subtraction processing using trigonometric functions, it is necessary to perform multiplication and division of multiple digits including the decimal point in order to obtain a predetermined precision. This requires a certain amount of calculation time, which has been an obstacle to improving the processing speed of banknote discrimination devices, which are usually combined with pattern discrimination.

It is also possible to prepare and refer to a table of correction data in advance and easily make corrections using correction values based on the oblique angle, but this would require storing a large number of correction data for each dimension of the banknote, and the width dimension There is a problem in that it is inefficient to secure an area in the data storage section just for the calculation of .

The present invention has been made in view of the above circumstances, and is a discriminating device that does not require a particularly large data storage area, does not require time for calculation processing, and is capable of determining accurate width dimensions through simple processing. The purpose is to provide the following.

"Means for Solving the Problems" In order to achieve the above object, the inventions recited in each claim of the present application have the following configurations.

The invention according to claim 1 is arranged along one direction perpendicular to the conveying direction of paper sheets,
width direction detection means for detecting the width direction of the paper sheets to be transported; After storing detection data related to the first corner and detection data related to the second corner located on the rear side of the front edge in the conveying direction, and obtaining detection data related to the first corner, During the time corresponding to the time difference between obtaining detection data related to the second corner, a side edge of the paper sheet extending rearward in the conveyance direction from the first corner or the second corner storage means for storing detection data related to the first corner, detection data related to the second corner, and detection data related to the side edge stored in the storage means; and calculation means for calculating the true width direction dimension of the paper sheet to be conveyed based on the information.

The invention according to claim 2 is the invention according to claim 1, in which the first dimension data is calculated in ) based on the detection data related to the first and second corner portions, and the first dimension data is calculated using the detection data related to the side edge portions. The second dimensional data determined by the above is added to the first dimensional data.

According to a third aspect of the present invention, in the second aspect of the present invention, -half of the displacement amount of the side edge portion in the width direction caused by the time difference is used as the second dimension data.

The invention according to claim 4 is the invention according to claim 1, wherein a first
At the same time, the second dimension data obtained from the detection data of the side edge portion is subtracted from the first dimension data.

The invention according to claim 5 is the invention according to claim 4, in which -half of the data regarding the amount of displacement in the width direction of the side edge portion is used as the second dimension data.

"Operation" According to the configuration of the invention as set forth in claim 1, based on the detection signal obtained from the width direction detection means a, detection data related to the leading first corner of the front edge of the paper sheet being conveyed is obtained. is obtained, and subsequently detection data relating to the subsequent second corner of the leading edge of the sheet is obtained, and both detection data are stored in the storage means.

On the other hand, during a time period corresponding to the time difference between obtaining detection data related to the first corner section and obtaining detection data related to the second corner section, from the first corner section or from the second corner section, Detection data relating to the side edges of the paper sheets extending from the corners to the rear of the conveyance are obtained by the width direction detection means a and similarly stored in the storage means.

Then, the calculation means C calculates the true width direction dimension of the paper sheet to be conveyed based on the detection data related to the first corner stored in the storage means.

In addition, in the invention according to claims 2 to 5, the second dimensional data itself related to the side edge portion, which has a characteristic of increasing depending on the time difference in which the first and second corner portions are detected, or By adding or subtracting half from the first dimension data, the first dimension data can be corrected to calculate the true width dimension.

"Example" Hereinafter, the present invention will be described in detail with reference to the drawings.

First, a first embodiment shown in FIGS. 2 to 5 will be described.

Symbols IL and IR are width sensors, and these width sensors IL and IR are used in the width direction of the paper sheet P (a direction perpendicular to the conveying direction in the direction of the arrow in FIG. P
It is composed of a large number of photoelectric conversion elements s1, . . . , so arranged in the direction along the long side of

The width sensors IL and (R are respectively sensor control circuits 2
The control circuits 2L and 2R control each of the optical conversions based on pulses output from a clock generator 3 such as a rotary encoder synchronized with the drive mechanism of the transport system. The elements S, -S□ are sequentially operated at a predetermined period (sufficiently faster than the conveyance speed), the paper sheet P is scanned in the width direction, and each light conversion element S,
~S, is covered by the paper leaf P (is it illuminated by a light)?
Furthermore, time-series data supplied from the left and right width sensors IL-IR, W L + +
WL! ＋・・・・・・wL,.

W R1r W Rt,...wRn [Same subscripts indicate data obtained at the same time (time that can be considered),
Further, each data is a set of data regarding ON or OFF of each photoelectric conversion element S obtained in the scanning of that time] is supplied to the counters 4L and 4R.

In addition, the counters 4L and 4R count the number of light conversion elements S, which have detected the passage of a paper sheet P at a certain time, and supply this count value to the CPU 5 as data on the width dimension of the paper sheet P. ing. The CPU 5 also has a ROM 6
It operates according to a program written in the RAM 7, and while the width data is once written into the RAM 7, it is sequentially read out and predetermined arithmetic processing is performed.

Then, if the width data measured at time X is W'X, this W'x is W'x=wLx+wRx+a--(1)
is given by a constant 1, which is the distance between the left and right width sensors IL and IR. (See FIG. 4) Furthermore, as shown in FIG. 3, when the sheet P enters onto the width sensor IL with its left end leading, the data wL obtained from the width sensor IL monotonically increases. Furthermore, as the paper sheet P advances to a certain extent, the data wR of the right width sensor IR also increases monotonically, and when the right end (right breast) of the paper sheet P enters above the width sensor IR at timing i, the maximum value WRf, aK
(=WR1), and then monotonically decreases. Therefore, it is possible to determine the amount of obliqueness of the sheet P based on changes in these data strings.

Next, the principle of skew correction based on the measurement of the data string will be explained with reference to FIG.

The width data at time j after time i when wR is maximum can be expressed as W'j=wL, 10wR, +a from the above equation (1), and in the section after time i, as time progresses, , wR simply decreases.

Here, if the correction width data W'j is defined as W'j=wL, ++wRJ, +a, then from the above W'j and W'j, the corrected width data Wj can be written as Wj=(Wj'+Wj ')/2 = wL j+(wRJ+wRJ++)/2+a...
...(2) It can be calculated based on the following formula.

In other words, when the amount of obliqueness is large, the difference in the timing at which the left and right sensors detect the presence of banknotes becomes large, so the above i also becomes large. Since a decreased value is used, a smaller value is obtained as Wj as the calculation result of equation (2) above, and as a result, qualitatively, the larger the diagonal equivalence, the more the measured data becomes This means that larger corrections can be made.

Then, wj calculated based on the above formula (2) is the true width value W calculated from the oblique angle θ using trigonometric functions.
This is a value that can be approximated with a degree of accuracy that poses no practical problem. The basis for this will be explained below with reference to FIG.

That is, the above W' and W'' are respectively W'=W/c
o sθ ・・・・・・(3) W'=WX c o
It can be expressed as sθ...(4), and these (
3) From formula (4), W = 88tsu 5har'...
(5) W'= W'Xcos 'θ・=-(6)
is obtained. That is, W can be calculated by equation (5) using W' and W' as variables without using a trigonometric function of the oblique angle θ.

Furthermore, for the purpose of simplifying the arithmetic processing, if an approximate equation (W' + W'')/2 (the equation before transformation of the above two equations) is used in place of the above equation (5), the error Dir in this case is
r is DIrr= (W' + W')/2- He17V'=
It can be expressed as (αl'-fV')'/2, and when the above equation (6) is applied to this equation, Difr=W'x(1-Cos θ)''/2.

Therefore, for example θ=l Oo, W'-200mm
The error Diff that occurs in the case of ``Diff'' is 0.023 mm, and it is possible to obtain a practically sufficient accuracy.

That is, in the present invention, the width data is obtained using the following formula: w=(w'-W')/2 (7).

Then, the width data wj obtained by the above calculation is used as a reference width data (for example, width data for each banknote of each denomination).
By comparing this with the CPU, it is possible to determine the denomination, authenticity, etc. of the paper sheet.

It goes without saying that the specific configuration of the hardware necessary to implement the present application is not limited to the above embodiment. For example, instead of using a large number of photoelectric conversion element groups as in the embodiment as a width sensor, a photoelectric conversion means covering the entire predetermined inspection width is used, and the output of this photoelectric conversion means is converted into the amount of light received (light reception width). It is also possible to use this change as width data for paper sheets.

In addition, by repeating the width calculation process described above based on the data sequentially detected after time i when the right edge of the paper sheet is detected, and taking the arithmetic average of the results, it is possible to reduce the disturbance at the edge of the paper sheet. Of course, it is also possible to eliminate the influence of the resulting error.

Furthermore, in the first embodiment, time-series data w supplied from the left and right width sensors IL-IR, respectively.
Ln-wRn is ON or OF of each photoelectric conversion element Sm
Although the explanation has been given as to a set of data regarding F, that is, a count value, it is not necessarily a count value, but it is also possible to store the data as coordinate data and then perform the above calculation as width data.

Next, a second embodiment will be described with reference to FIG.

This second embodiment differs from the first embodiment in that the left and right width sensors IL-IR are composed of one width sensor 10.

Therefore, in this second embodiment, the width data of the paper IP can be obtained based on the coordinate data of the shaded position supplied from the width sensor IO, and for example, the 't' end position data ZL of the paper P and the right end position data ZR, the width data W' and W'' are obtained, and the true width data is calculated.

Therefore, this second embodiment is better than the second embodiment of the first embodiment.
The object of the present application can be achieved with a circuit configuration that is even simpler than the circuit configuration shown in the figure.

Next, a third embodiment will be described with reference to FIG.

This third embodiment can be achieved with the circuit configuration of either the first embodiment or the second embodiment, and either can be implemented with further simplified control.

That is, in the first embodiment or the second embodiment, after obtaining the width data W', it was necessary to provide a time lag, obtain the width data W'', and perform the arithmetic processing of the above equation (7). However, in this third method, the width data corresponding to the width data W' can be obtained at the timing when the width data W' can be obtained, and the true width data can be obtained at an early timing. It is something.

That is, in this third embodiment, attention is paid to the above equation (7).

First, the above equation (7) is transformed as follows.

W= (W'+W')/2 -(2W'-W'+W')/2 =W'-(W'-W')/2 ・・・・・・(
8) Or, W-(W'+W')/2 -(2W'+W'-W')/2 =W'+ (W'-W')/2 ・・・・・・(
9) Furthermore, from the above equations (3) and (4), if the width data W' and W'' are rewritten as shown in FIG. 7, the following becomes clear.

The width data W' corresponds to the width data when a second corner of the leading edge of the transported paper IP is detected, following the first corner of the leading edge of the transported paper IP. Width data W'
corresponds to the sum of the width data M and N shown in FIG.

Further, the width data W# corresponds to the width data from the selected first corner of the leading edge of the sheet P to the second corner following the leading edge, and the width data W' also corresponds to the width data M shown in FIG.

Further, the width data N shown in FIG. 7 is determined by the width data N shown in FIG. Detection data related to the side edge of the sheet P extending from the first corner or the second corner toward the rear of conveyance, that is, corresponds to the amount of displacement in the width direction of the side edge of the sheet P. It is clear that this is width data.

The above equation (8) is based on the maximum width data detected from the paper sheet P conveyed in an oblique state, that is, the seat [ZLi and the coordinate ZR
From the width data M+N between i, half of the displacement 11N in the width direction of the side edge of the paper sheet P, that is, the coordinate ZLo and the coordinate ZLi
It is clear that this corresponds to the subtraction process of half of the width data N between them.

In addition, the above equation (9) is calculated from the first corner of the front end detected from the sheet P conveyed in an oblique state to the second
Width data to the corner of
It is clear that this corresponds to the addition of half of the widthwise displacement amount N of the side edge of the paper sheet P, that is, half of the width data N between the coordinates ZLo and ZLi, to the width data M between Li. be.

From these facts, at least the detection data related to the preceding first corner of the leading edge of the sheet P to be conveyed, the detection data related to the succeeding second corner of the leading edge, and the sensing data related to the first corner During the time corresponding to the time difference between obtaining detection data related to the corner and obtaining detection data related to the second corner, the transport rearward from the first corner or from the second corner It becomes clear that the true width data can be calculated by storing detection data relating to the side edges of the sheet P extending over the width of the sheet P.

From the above description, it will be understood that each of these detection data can be more conveniently obtained by using coordinate data.

"Effects of the Invention" As is clear from the above explanation, since the present invention uses a width direction detection means that detects at least the left and right edges of paper sheets, the width data calculated from the measurement results are Since true width data can be obtained through addition and subtraction processing, trigonometric function calculations, which place a large load on the arithmetic elements, and correction data tables, which place a large load on the storage means, can be stored. This has the effect that the true width data can be easily obtained without having to worry about it.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram showing the configuration of the present invention, Figs. 2 to 5 show a first embodiment of the invention, Fig. 2 is a professional diagram of the entire discrimination device, and Fig. 3 4 is an explanatory diagram of the sampling timing of width data, FIG. 5 is an explanatory diagram of the principle of skew correction, and FIG. 6 is a diagram illustrating the principle of skew correction. This shows the second embodiment, and is a plan view showing the arrangement of the width sensor. FIG. 7 shows the third embodiment of the present invention, and is an explanatory diagram showing the principle of simpler tilt correction. a... Width direction detection means, b... Memory means, C... Calculation means.

Claims (5)

[Claims] (1) A width direction detection means arranged along a direction perpendicular to the conveyance direction of paper sheets and detecting the width direction of the paper sheets being conveyed; and a detection signal obtained from the width direction detection means. Based on the detection data related to the first corner located on the front side in the transport direction of the front edge of the paper sheet to be transported, and the detection data related to the second corner located on the rear side in the transport direction of the front edge In addition to storing the data, during a time corresponding to a time difference between obtaining detection data related to the first corner and obtaining detection data related to the second corner, the first corner or the storage means for storing detection data related to the side edge of the paper sheet extending rearward in the conveyance direction from the second corner; and detection data related to the first corner stored in the storage means; 2, and a calculation means for calculating the true width dimension of the paper sheet to be conveyed based on the detection data related to the corner portion and the detection data related to the side edge portion. Paper sheet discrimination device. (2) The calculation means calculates first dimension data obtained from the detection data related to the first corner and detection data related to the second corner from the detection data related to the side edge. 2. The paper sheet discriminating device according to claim 1, wherein the true width direction dimension of the paper sheet to be conveyed is calculated by adding the second dimension data. (3) The second dimension data added to the first dimension data is dimension data corresponding to half of the widthwise displacement amount of the side edge portion. Paper sheet discrimination device. (4) The calculation means calculates first dimension data obtained from the detection data related to the second corner and detection data related to the side edge from first dimension data obtained from the detection data related to the side edge. 2. The paper sheet discriminating device according to claim 1, wherein the true width direction dimension of the paper sheet to be conveyed is calculated by subtracting the size data of No. 2. (5) The second dimension data subtracted from the first dimension data is dimension data corresponding to half of the widthwise displacement amount of the side edge portion. Paper sheet discrimination device.