Method of monitoring matoti and decay of banknotes


B65H29/62 - diverting faulty articles from the main stream (control devices detecting faulty articles B65H0043040000)

 

The invention relates to control of banknotes in a Bank sorting machines. The technical result consists in providing reliable control of matoti and decay of notes. The way to get the profile of the banknote using the triangulation method of measuring the distance of points on the bill with respect to the surface movement of banknotes, calculate the collation of banknotes on the basis of statistical calculations for each type of banknote with output signals: "fit", "doubtful", "unfit", depending on the calculated collation. Oversee matoti and breaks along both sides of the banknote. 3 C.p. f-crystals, 2 Il.

The invention relates to methods of control of banknotes in the Bank automated sorting machines for sorting out creased and old.

Various methods of automatic control of decay of banknotes with the aim of removing them from circulation [1]. In the category include old banknotes or those with defects in the form of gaps, holes, etc., or unable to keep the shape like soft tissue. In a known way bill first passed through capacitive sensor, then through optiy areas and additionally to change the transmission or reflection light from these sites, is determined by the optical sensor. In another additional method, described in [1], using a pneumatic sensor determines the amount of deflection of the free end of banknotes under the pressure of the air jet.

Widespread recently got the machine working with banknotes, such as ATMs, counters, sorters, which led to higher requirements to the quality of banknotes in circulation. From circulation should be removed not only worn (old), but wrinkled banknotes as they can get stuck in these machines. Considered in [1] control methods are insensitive to matoti not worn banknotes, as in this case changes the structure of the material (paper), and the form.

There is also known a method of monitoring matoti sheets [2], based on the determination of the offset of the additional roller relative to the support when getting between them Ismatov sheet with folds. This method is unsuitable for determining matoti banknotes, because it involves quite a lot of pressure on the sheet, and imatest in the form of bumps and hollows, when there are no folds on the banknote, smoothed.

As the near the banknote is transported through the support surface, for example, through the support roller and the surface of the measured laser triangulation method distances to points on the surface of the banknote. Described measuring method and device for its implementation can be used in a certain part to solve the problem of determining matoti and decay of notes.

The aim of the invention is to develop a reliable method of monitoring matoti and decay of banknotes when they are checked in an automated sorting machine.

To achieve this goal States that a method of control of banknotes in the automated sorting machine, which consists in the fact that the banknote is transported through the support surface, for example, through the support roller and the surface of the laser triangulation method to measure the distance hi(where i is the number of points on the surface of the banknote from the roller surface to points on the surface of the banknote as it moves through the support roller will cause the profile of the banknote, which is determined by the number of points N, the data recorded in the memory of the computing device (WU).

In contrast to the known method, in the present method on the basis of the obtained data with which to compare with the threshold values of sorting out the banknotes St1and St2good, doubtful, bad, specified in advance in the VU based on statistical calculations for each type of banknotes and produce a corresponding signal analysis "fit", "doubtful", "fail” depending on which of the specified limits exceeds the parameter analysis S.

To calculate the option of sorting out S perform the following sequence of operations:

a) drop (0.05 to 0.1)NSsamples at the beginning and end of the banknote and get a sample of N samples, i.e. N=...0,95 0,9 NS;

b) calculate the average value of N=hi/N and the deviation from the averagei=hi-N.;

C) calculate the amplitude of the harmonics of the spectrum according to the formula of the discrete Fourier transform:

where k is the number of the harmonic component of the signal; and

i is the number of points on the banknote;

j is the imaginary unit;

N - number of samples hi.

g) calculate the sum S of the squares of modules of A(k) from the first to the d component,

where d=5...10.

In addition, the control matoti and breaks carry out along both sides of the banknote.

Bill pressed against the roller by the belt at two points stand in the range of 10-25 mm, and the position of the laser emitters regulated depending on the width of the banknote so that the rays fell on the bill at least 2 mm from the edge with regard to its possible transverse displacement.

Set a threshold hpabove which deviations from the average, produce additional signal sorting, which indicates that the banknote has any breaks or kinks with a large amplitude.

To clarify the essence of the invention described drawings. In Fig.1 is a diagram of the device in two projections, which implements the inventive method, where:

1 - banknote;

2 - the support roller;

3 - laser triangulation sensor - temperature measuring distances;

4 - laser emitter;

5 - beam laser;

6 - linear matrix photodetectors;

7 - lens;

8 - belt pinch;

9 - the belt support.

In Fig.2 shows examples of entries in the profiles of banknotes: a) mint banknote; b) the old banknotes, with the gap; C) the new banknotes.

The method is implemented as follows. Bill 1 (see Fig.1A) is transported via belt 8 and 9 through the support roller 2, which involves laser triangulation sensor 3. The laser emitter 4 forms a narrow beam 5 is a face in the absence of the banknote or C1on the banknote and using the lens 7 creates an image of the barcode on the linear matrix photodetectors 60' and C1. It is obvious that a segment of C0C1equal to the measured distance hi, a h'i=m hiwhere m is the magnification factor of the lens. For simplicity we assume that m = 1. If you take a typical linear matrix with the number of sensors 250 and step between elements 14 μm, thus we control zone 3.5 mm with increments of 14 μm, which is sufficient for practical use. A survey of all of the elements of the matrix and determine the amount of hiruns for time t. If the speed of movement of the banknote V, and length L, then the number of counts will get N=L/(Vt). For example, if V=2000 mm/s, L=150 mm, t=2,510-4C, then N=300.

Thus with the passage of the banknote by the sensor removed her profile with N samples hi. The implementations shown in Fig.2 shows that the minimum deviation from the average value of Nmgive new banknotes, and the maximum is wrinkled. Old banknotes give a greater deviation than new. Such notes are often bends and/or breaks, which are characterized by sharp emission (see Fig.2B). So the Yan. This is because the free ends of the banknote, as a rule, are lifted above the roller. It follows that such measurements should be excluded from further analysis.

If in the known method the number of measurements of hialong the banknote is not critical and can range 10-50, to implement the proposed method requires a greater number of measurements of hi. So, if you want to control islatest (the roughness of the surface) with the length of the "wave" of 2 mm, the step counts should be not more than 1 mm, Then on the basis of the received data calculated by the WU settings of sorting out creased and old banknotes and when you hit the specified parameters within these limits produce appropriate signals for analysis of banknotes. Calculation of parameters of sorting out S as follows:

a) drop (0.05 to 0.1)N times at the beginning and end of the banknote; because the ends of her approach to the measurement point (and the output from it), as a rule, thibaudia from the roller surface and thereby contribute to distortions in the results of the calculations;

b) calculate the average value of Hm=hi/N and the deviation from the averagei=hi-Hm;

d) producing a signal corresponding to the sorting depending on which of the specified intervals hits obtained for this banknote value of S;

e) set the threshold parameter analysis hpabove which deviations from the average, produce additional signal sorting, which indicates that the banknote has any breaks or kinks with a large amplitude, i.e., high hills and deep "depression" as a result of bending of the banknote.

Because the breaks, usually found on the edges, it is proposed to perform the control in this way on two edges along the banknote pressing banknotes to the roller to run the belt at two points in the transverse direction at a certain distance from its edges, for example 10-25 mm, and the position of the laser emitters to adjust depending on the width of the test banknotes so that the rays fell on the bill at least 2 mm from the edge with regard to its possible transverse displacement.

The method was verified on the sorting machine of the type BARS, designed and manufactured by the firm "data Center", , Ekaterinburg. When tested on the samples of banknotes of different quality were obtained following reach results multiplier 105are discarded.

a) Banknotes in the denomination of 10 roubles fit: S=0,23...0,63;

b) Banknotes in the denomination of 10 roubles worn with creases and/or tears on the edges: S=2,85...9;

in New banknotes 1$: S=0,3...0,4;

g) New, but wrinkled banknotes 1$: S=3...5;

e) Worn-out banknotes 1$ without breaks: S=0,8...3.

The obtained data show that the threshold values for rejection should be set depending on the type of banknotes (Euro, USD, Euro, etc). So, in the example of banknotes in the denomination of 10 roubles threshold value when the rejection of "good - doubtful - bad", you should install the St10,7 - questionable, St22 - defective, i.e. old. Doubtful banknotes from 0.7S2 are sorted separately. For banknotes in denominations of 1$ St20.5 and if it exceeds this limit value of the banknote will be sorted out in this case as worthless. An additional method of analysis is the selection in excess of a predetermined threshold amplitude hiif it is detected a sharp bend notes and/or the gap in this place.

and the gap will exceed the threshold and made the signal for the rejection of this bill. Moreover, it may be that only exceeded the threshold of hpand the threshold of St- no. This can be a good bill with inflection and such a bill could these signs be sorted out separately from the old.

Sources of information

1. U.S. patent No. 5986457, G 07 D 7/00.

2. The Japan Patent No. 5024713, 65 N. 7/12.

3. Patent Of Russia № 2173886, G 07 D 7/06.

Claims

1. The control method of banknotes in the sorting machine, which consists in the fact that the banknote is transported through the support surface, for example through the support roller, and the surface of the laser triangulation method with laser emitters measure the distance hi(where i is the number of points on the bill) from the roller surface to points on the surface of the banknote as it moves through the support roller will cause the profile of the banknote, which is determined by the number of samples N, the data recorded in the memory of the computing device (WS), characterized in that to determine matoti and decay of notes, which on the basis of the obtained data using WU expects parameter analysis S for each banknote, which is compared with the threshold values of sorting out the banknotes Shi/N and the deviation from the averagei=hi- H and define a “crumpled banknotes on the maximum deviation from the average H; C) calculate the amplitude of the harmonics of the spectrum according to the formula of the discrete Fourier transform:

where k is the number of the harmonic component;

i is the number of points on the banknote;

j is the imaginary unit;

N - number of samples hi;

g) calculate the sum S of the squares of modules of A(k) from the first to the d component,

where d=5-10.

2. The method according to p. 1, wherein the monitoring is performed along both sides of the banknote.

3. The method according to p. 1, characterized in that the banknote is pressed by the roller belt at two points in the transverse direction so that the distance of each belt to the corresponding edge of the banknote was in the range of 10-25 mm, and the position of the laser emitters regulated depending on the width banknotes.

4. The method according to p. 2, wherein the set threshold value of hpabove which deviations from the average produce additional signal sorting, which indicates that the banknote has any breaks or kinks with a large amplitude.

 

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