JP2020160578A - Paper sheet thickness detection device and paper sheet thickness detection method - Google Patents

Abstract

To provide a paper sheet thickness detection device and a paper sheet thickness detection method that prevents the detection accuracy from decreasing due to transport speed of the paper sheet when detecting paper sheet thickness.SOLUTION: A paper sheet thickness detection device for detecting the thickness of a paper sheet to be transported includes: a reference roller and a displacement roller arranged facing each other; a thickness detection unit that detects the thickness data of the paper sheet by detecting the displacement amount of the displacement roller when the paper sheet passes between the reference roller and the displacement roller; a storage unit that stores reference thickness data of genuine paper sheet and correction information according to the transport speed of the paper sheet; and a thickness determination unit that determines the thickness of the paper sheet by comparing the detected thickness data with the reference thickness data by using the correction information according to the transport speed of the paper sheet.SELECTED DRAWING: Figure 6

Description

The present invention relates to a paper leaf thickness detecting device and a paper leaf thickness detecting method. More specifically, the present invention relates to a paper leaf thickness detecting device and a paper leaf thickness detecting method for collecting thickness data of paper sheets such as banknotes and comparing them with a reference thickness data.

In a banknote processing device such as an automated teller machine (ATM), damage to banknotes such as torn banknotes, missing holes, folds, wrinkles, and tape sticking can be detected, and multiple banknotes can be stacked and transported. A banknote thickness detecting device is generally provided in order to detect the banknotes that have been printed. In such a bill thickness detection device, the thickness detection accuracy may decrease depending on the transport state of the bill.

On the other hand, in Patent Document 1, the thickness distribution data obtained from the thickness data of the banknotes detected by the thickness detection mechanism is used as the banknotes such as the transport direction, the shift amount of the transport position of the bills, and the skew amount. It is described that the banknotes are discriminated after being corrected based on the transport posture of.

Patent Document 2 describes a method of detecting a transport position of paper sheets to be transported and, based on the detected transport position, switching a determination threshold value for performing thickness determination to an optimum value, and actually detecting the method. It is described that by using a method of determining the thickness after correcting the thickness information, it is possible to prevent erroneous determination due to a change in the transport position of paper sheets.

Japanese Patent No. 4387176 Japanese Unexamined Patent Publication No. 6-329299

The bill thickness detecting device is required to improve the thickness detection accuracy. On the other hand, in order to improve the performance of the banknote processing device, it is being studied to provide a function that enables selection of the transport speed of banknotes in the banknote processing device. According to the studies by the present inventors, it has been found that in the bill thickness detection device provided with the mechanical detection means, the thickness detection value fluctuates by changing the transport speed of the bill, and the detection accuracy is lowered. Therefore, when the bill processing device is provided with a function that enables the selection of the transport speed of bills, it has been required to prevent the thickness detection accuracy of the bill thickness detecting device from being lowered.

The present invention has been made in view of the above-mentioned current situation, and is a paper leaf thickness detecting device and a paper leaf that prevent the detection accuracy from being lowered by the transport speed of the paper leaves in the detection of the thickness of the paper leaves. It is an object of the present invention to provide a thickness detection method.

The present invention is a paper leaf thickness detecting device for detecting the thickness of paper sheets to be conveyed, comprising a reference roller and a displacement roller arranged to face each other, and the paper leaves between the reference roller and the displacement roller. A thickness detection unit that detects the thickness data of paper sheets by detecting the amount of displacement of the displacement roller when the paper leaves pass, and correction according to the reference thickness data of genuine paper sheets and the transport speed of the paper sheets. Thickness for determining the thickness of paper leaves by comparing the detected thickness data with the reference thickness data using the storage unit for storing information and the correction information according to the transport speed of the paper leaves. It is characterized by including a determination unit.

Further, the present invention is characterized in that, in the above invention, the thickness determination unit corrects the detected thickness data by the correction information.

Further, the present invention is characterized in that, in the above invention, the thickness determination unit corrects the reference thickness data by the correction information.

Further, in the present invention, in the above invention, the thickness determination unit compares the comparison result of the detected thickness data with the reference thickness data with the threshold value corrected by the correction information to determine the thickness of the paper leaves. It is characterized in that it is a judgment.

Further, in the above invention, in the above invention, the correction information corrects a detection abnormality of the thickness data immediately after the entry, which is detected when the conveyed paper sheets enter between the reference roller and the displacement roller. It is characterized by being something to do.

Further, in the present invention, the correction information is characterized in that a larger correction amount is set as the transport speed of paper sheets is faster.

Further, the present invention is a paper leaf thickness detecting device for detecting the thickness of paper leaves to be conveyed, which includes a reference roller and a displacement roller arranged to face each other, and has a paper between the reference roller and the displacement roller. A thickness detection unit that detects the thickness data of paper leaves by detecting the amount of displacement of the displacement roller when the leaves pass, and a plurality of reference thickness data that differ depending on the transport speed of genuine paper leaves are stored. A specific reference thickness data is selected from the plurality of reference thickness data according to the storage speed of the paper leaf and the selected specific reference thickness data is compared with the detected thickness data. It is characterized by comprising a thickness determination unit for determining the thickness of paper sheets by performing the process.

Further, the present invention is a method for detecting the thickness of paper sheets to be conveyed, wherein the displacement roller when the paper leaves pass between a reference roller and a displacement roller arranged so as to face each other. Using the thickness detection step that detects the thickness data of paper sheets by detecting the amount of displacement of the paper sheets and the correction information according to the transport speed of the paper sheets, the detected thickness data and the reference of the genuine paper sheets. It is characterized by including a thickness determination step of determining the thickness of paper sheets by comparing with the thickness data.

Further, the present invention is a method for detecting the thickness of paper leaves to be conveyed, wherein the displacement roller when the paper leaves pass between a reference roller and a displacement roller arranged so as to face each other. A thickness detection step that detects the thickness data of paper leaves by detecting the amount of displacement of the paper leaves, and a specific reference thickness data is selected from a plurality of reference thickness data according to the transport speed of the paper leaves and selected. It is characterized by including a thickness determination step of determining the thickness of paper leaves by comparing the specific reference thickness data with the detected thickness data.

According to the paper leaf thickness detecting device and the paper leaf thickness detecting method of the present invention, it is possible to prevent the detection accuracy from being lowered depending on the transport speed of the paper sheets in the detection of the thickness of the paper sheets.

It is sectional drawing when the thickness detection sensor which concerns on embodiment is seen from the side. It is a perspective schematic diagram which shows the appearance on the detection block side of the thickness detection sensor which concerns on embodiment. It is a figure which showed schematic the whole structure of the paper leaf thickness detection apparatus which concerns on embodiment. It is a graph which showed an example of the output waveform of the displacement sensor when the thickness of the banknote carried at low speed is measured. It is a graph which showed an example of the output waveform of the displacement sensor when the thickness of the banknote transported at high speed is measured. It is a functional block diagram which showed the structure of the control part and the storage part connected with the thickness detection sensor which concerns on embodiment. It is a figure explaining the determination method of the thickness abnormality of the banknote when the detected thickness data is corrected by the correction information. It is a figure explaining the determination method of the thickness abnormality of the banknote when the reference thickness data is corrected by the correction information. It is a figure explaining the determination method of the thickness abnormality of the banknote when the threshold value is corrected by the correction information. (A) is a schematic perspective view showing the appearance of the banknote processing device according to the embodiment, and (b) is a schematic cross-sectional view showing the outline of the structure inside the banknote processing device according to the embodiment.

Hereinafter, embodiments of the paper leaf thickness detecting device according to the present invention will be described.

The paper leaf thickness detecting device detects the thickness of the conveyed paper leaves. The paper leaf thickness detection device is preferably installed in a paper leaf processing device provided with a mechanism for transporting the paper leaves, and is more often used together with the paper leaf identification device in the paper leaf processing device. preferable. By using the information on the type and orientation of paper sheets acquired by the paper leaf identification device in addition to the transport speed of paper sheets, the detection accuracy can be improved when detecting abnormal thickness of multiple types of paper sheets. Can be improved.

The types of paper leaves are not particularly limited, and examples thereof include banknotes (banknotes), gift certificates, payment slips, checks, securities, and card-like media. The present invention can be applied to the detection of the thickness of paper sheets, but the case where the paper leaves are banknotes will be described below as an example.

The paper sheet thickness detection device (banknote thickness detection device) includes a thickness detection unit (thickness detection sensor). An example of the configuration of the thickness detection sensor will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic cross-sectional view of the thickness detection sensor according to the embodiment when viewed from the side. The thickness detection sensor 10 includes a reference roller 11 and a displacement roller 12 arranged to face each other, and detects the amount of displacement of the displacement roller 12 when the bill P passes between the reference roller 11 and the displacement roller 12. Detect the thickness data of.

As shown in FIG. 1, the thickness detection sensor 10 includes a reference roller 11 to which the rotating shaft 11a is fixed and used as a thickness determination reference, a displacement roller 12 provided in contact with the reference roller 11, and one end thereof. Is provided with a displacement roller 12, the other end of which is rotatably fixed around the fulcrum shaft 14, and is rotationally displaced in the arrow direction according to the thickness of the bill P passing between the reference roller 11 and the displacement roller 12. The detection block 13 and the holding block 15 that holds at least the fulcrum axis 14 of the detection block 13 and the holding block 15 are fixed, and a part of the detection block 13 is pressed to adhere the displacement roller 12 and the reference roller 11. The leaf spring 16 and the leaf spring 16 are displaced by being pushed upward in response to the rotational displacement of the detection block 13 when the bill P passes between the reference roller 11 and the displacement roller 12. It is equipped with a displacement sensor 17 that detects the amount in a non-contact manner.

The principle of thickness detection will be briefly explained. When the bill P is conveyed and enters between the reference roller 11 and the displacement roller 12, the rotation shaft of the reference roller 11 is fixed, so that the displacement roller 12 is pushed upward by the thickness of the bill P. Since the detection block 13 to which the displacement roller 12 is fixed is rotatably fixed by the fulcrum shaft 14, when the displacement roller 12 moves upward, the detection block 13 also moves upward. The leaf spring 16 that is constantly in contact with the detection block 13 and pushes the detection block 13 downward by an elastic force is displaced upward according to the movement of the detection block 13. The displacement sensor 17 outputs a change in the distance (d) between the leaf spring 16 and the displacement sensor 17 (displacement amount of the displacement roller 12) as an electric signal. The leaf spring 16 is not limited to the metal one, but may be made of a resin. When the leaf spring 16 is made of resin, the displacement sensor 17 may use a distance sensor using a laser or the like.

Further, when the bill P finishes passing between the reference roller 11 and the displacement roller 12, the detection block 13 is pushed down by the elastic force of the leaf spring 16, and the reference roller 11 and the displacement roller 12 are brought into close contact with each other again.

As shown in FIGS. 1 and 2, the thickness detection sensor 10 further includes a thin plate-shaped scraper 19. The scraper 19 is screwed to the detection block 13 and is in contact with the displacement roller 12 substantially vertically. Foreign matter adhering to the bill P may be transferred to the displacement roller 12, but by providing the scraper 19, the foreign matter adhering to the displacement roller 12 can be removed as the displacement roller 12 rotates.

FIG. 3 is a diagram schematically showing the overall configuration of the paper leaf thickness detecting device according to the embodiment. As shown in FIG. 3, the paper sheet thickness detection device includes a plurality of thickness detection sensors 10 arranged side by side in a direction (main scanning direction) orthogonal to the transport direction of the banknote P shown in FIG. .. The number of the thickness detection sensors 10 is not particularly limited, and for example, 12 are arranged. Each of the displacement sensors 17 included in the plurality of thickness detection sensors 10 is connected to the control unit 30, and the electric signal output by the displacement sensor 17 is processed by the control unit 30 to generate the thickness data of the bill P. .. By comparing the detected thickness data with the reference thickness data stored in the storage unit 50, it is possible to detect damage to the banknote P such as tearing of the banknote P, missing holes, folds, wrinkles, and sticking of tape. , It is possible to detect a banknote P in which a plurality of banknotes are stacked and transported.

In addition to the reference thickness data, the storage unit 50 stores correction information according to the transport speed of the bill P. By using the correction information, the detection accuracy of the paper sheet thickness detecting device can be maintained even if the paper sheet processing device changes the transport speed of the bill P.

The relationship between the transport speed of the banknote P and the thickness detection accuracy of the paper sheet thickness detecting device will be briefly described. FIG. 4 is a graph showing an example of the output waveform of the displacement sensor when measuring the thickness of the bill transported at low speed, and FIG. 5 is a displacement sensor when measuring the thickness of the bill transported at high speed. It is a graph which showed an example of the output waveform of. The banknote to be measured in FIG. 4 and the banknote to be measured in FIG. 5 are the same as the banknote to which the tape is attached.

As shown in FIG. 1, when the conveyed bill P passes between the reference roller 11 and the displacement roller 12, the displacement roller 12 moves upward, and the displacement sensor 17 detects the displacement amount of the displacement roller 12 for a certain period of time. By doing so, the output waveform of the displacement sensor 17 is created. The output waveform of the displacement sensor 17 is the thickness data of the bill P, and includes a component derived from the thickness of the bill P and a component derived from the vibration of the displacement roller 12 generated by the impact when the bill P enters.

The component derived from the thickness of the bill P is an object originally intended to be detected by the paper sheet thickness detecting device, and includes the height of the unevenness existing on the bill P and the thickness T of the tape attached to the bill P. On the other hand, the component derived from the vibration of the displacement roller 12 corresponds to the detection abnormality of the thickness data that occurs immediately after the bill P enters, and is unnecessary information (noise) that should be ignored in order to detect the thickness of the bill P. is there. From the comparison of FIGS. 4 and 5 in which the same banknote P is measured, it can be seen that the higher the transport speed of the banknote P, the larger the component derived from the vibration of the displacement roller 12. Therefore, in the present embodiment, the component derived from the thickness of the banknote P is extracted with high accuracy by removing the component derived from the vibration of the displacement roller 12 while taking into consideration the transport speed of the banknote P.

Next, a method for removing components derived from the vibration of the displacement roller 12 will be specifically described. FIG. 6 is a functional block diagram showing a configuration of a control unit 30 and a storage unit 50 connected to the thickness detection sensor according to the embodiment. FIG. 6 shows the parts related to the control of the paper leaf thickness detecting device with respect to the control unit and the storage unit included in the paper leaf processing device. That is, the control unit 30 and the storage unit 50 of the paper leaf thickness detection device may be a part of the control unit and the storage unit of the paper leaf processing device.

The control unit 30 includes a thickness data generation unit 31, a thickness determination unit 33, an identification processing unit 35, and a transfer control unit 37.

The thickness data generation unit 31 performs processing such as amplification and A / D conversion (digitization) on the electric signal output by the displacement sensor 17, and generates thickness data representing the thickness of the banknote. In addition, a process of storing the thickness data in the storage unit 50 is performed.

The thickness determination unit 33 determines the thickness of the banknote by comparing the thickness data generated by the thickness data generation unit 31 with the reference thickness data 51 stored in the storage unit 50. The reference thickness data 51 is selected based on the information on the type (denomination) and orientation of the banknotes obtained by the identification processing unit 35. At the time of comparison, in addition to the reference thickness data 51, correction information 53 and a threshold value 55 according to the transport speed of banknotes are used. The correction information 53 is set based on information on the type (hereinafter, also referred to as “denomination”) and orientation of the banknotes obtained by the identification processing unit 35, and the transport speed data 57.

The identification processing unit 35 collates the image data of the banknotes generated by the image sensor, the magnetic sensor, etc. with the determination data including the banknote template, the threshold value, etc. stored in the storage unit 50, and the denomination of the imaged banknotes. , Authenticity, correctness, etc. are judged.

The transport control unit 37 controls the transport mechanism 20, the branch mechanism, and the like. The transport mechanism 20 is a mechanism for controlling the transport of banknotes, and specifically includes a transport means such as a roller and a belt, and a drive device such as a motor. Banknotes move in the transport path when the rollers, belts, etc. are rotationally driven by the drive device. The transport control unit 37 controls the drive of the drive device according to the set transport speed of the banknotes. The branching mechanism is provided in the transport path to switch the transport destination of banknotes. The transport control unit 37 drives the branching mechanism according to the determination results of the thickness determination unit 33, the identification processing unit 35, and the like, and selects the transfer destination of the banknotes.

Reference thickness data 51, correction information 53, threshold value 55, transport speed data 57, and the like are stored in the storage unit 50. The reference thickness data 51 is data corresponding to the thickness of a genuine banknote. The correction information 53 is information for correcting the detected thickness data, the reference thickness data 51, the threshold value 55, and the like in order to prevent the detection accuracy of the thickness of the banknote from being lowered due to the transport speed of the banknote. The threshold value 55 is a reference value used for determining the presence or absence of an abnormality in the thickness of the banknote based on the degree of agreement between the reference thickness data 51 and the detected thickness data.

In the present embodiment, first, the thickness detection step of detecting the thickness data of the banknote by detecting the displacement amount of the displacement roller when the banknote (paper sheets) passes between the reference roller and the displacement roller arranged so as to face each other. Is done. Subsequently, a thickness determination step of determining the thickness of the banknote is performed by comparing the detected thickness data with the reference thickness data 51 of the genuine banknote using the correction information 53 according to the transport speed of the banknote. .. That is, by using the correction information 53, the component derived from the vibration of the displacement roller can be removed. The correction information 53 corrects the detection abnormality of the thickness data immediately after the entry, which is detected when the conveyed banknote enters between the reference roller and the displacement roller. Specifically, when the thickness determination unit 33 compares the reference thickness data 51 with the detected thickness data, the detected thickness data, the reference thickness data 51, or the threshold value 55 is corrected by using the correction information 53. Will be done.

The thickness determination unit 33 may correct the detected thickness data by the correction information 53. FIG. 7 is a diagram illustrating a method of determining a thickness abnormality of a banknote when the detected thickness data is corrected by correction information. The detected thickness data (A) shown in the upper part of FIG. 7 includes a thickness increasing portion 31a derived from the vibration of the displacement roller, a thickness increasing portion 31b derived from the unevenness existing on the surface of the bill, and a tape attached to the bill. There is a thickness increasing portion 31c derived from the above. Here, based on the correction information 53, (A) correction is performed by subtracting the thickness increasing portion 31a from the detected thickness data. In the reference thickness data (B) shown in the center of FIG. 7, a thickness increasing portion 51b derived from the unevenness existing on the surface of the bill is present. The thickness of the thickness increasing portion 51b is the same as the thickness of the thickness increasing portion 31b. That is, it can be said that the thickness increasing portion 31b reflects the unevenness existing on the surface of the genuine banknote, and does not reflect the thickness of the banknote. The (C) comparison result shown in the lower part of FIG. 7 is the data obtained by subtracting (B) the reference thickness data from the corrected (A) detected thickness data. As shown in the figure, the thickness increasing portion 31a is removed by (A) correction of the detected thickness data, and the thickness increasing portion 31b is removed by (B) the reference thickness data. Therefore, (C) the comparison result is affixed to the banknote. Only the thickness increasing portion 31c derived from the tape is present. Therefore, the thickness of the thickness increasing portion 31c and the threshold value 55 are compared, and it is determined that the thickness of the bill is abnormal.

The thickness determination unit 33 may correct the reference thickness data 51 with the correction information 53. FIG. 8 is a diagram illustrating a method of determining a thickness abnormality of a banknote when the reference thickness data is corrected by correction information. The detected thickness data (A) shown in the upper part of FIG. 8 includes a thickness increasing portion 31a derived from the vibration of the displacement roller, a thickness increasing portion 31b derived from the unevenness existing on the surface of the bill, and a tape attached to the bill. There is a thickness increasing portion 31c derived from the above. In the reference thickness data (B) shown in the center of FIG. 8, there is a thickness increasing portion 51b derived from the unevenness existing on the surface of the banknote. Here, based on the correction information 53, (B) correction is performed by adding the thickness increasing portion 53a to the reference thickness data. The (C) comparison result shown in the lower part of FIG. 8 is the data obtained by subtracting the corrected (B) reference thickness data from the (A) detected thickness data. As shown in the figure, the thickness-increasing portions 31a and 31b are removed by the corrected (B) reference thickness data. Therefore, in the comparison result (C), only the thickness-increasing portion 31c derived from the tape attached to the banknote is shown. Existing. Therefore, the thickness of the thickness increasing portion 31c and the threshold value 55 are compared, and it is determined that the thickness of the bill is abnormal.

The thickness determination unit 33 may determine the thickness of the banknote by comparing the comparison result of the detected thickness data and the reference thickness data 51 with the threshold value corrected by the correction information 53. FIG. 9 is a diagram illustrating a method of determining an abnormality in the thickness of banknotes when the threshold value is corrected by the correction information. The detected thickness data (A) shown in the upper part of FIG. 9 includes a thickness increasing portion 31a derived from the vibration of the displacement roller, a thickness increasing portion 31b derived from the unevenness existing on the surface of the bill, and a tape attached to the bill. There is a thickness increasing portion 31c derived from the above. In the reference thickness data (B) shown in the center of FIG. 9, there is a thickness increasing portion 51b derived from the unevenness existing on the surface of the banknote. The (C) comparison result shown in the lower part of FIG. 9 is the data obtained by subtracting (B) the reference thickness data from the (A) detected thickness data. As shown in the figure, the thickness increasing portion 31b is removed according to (B) the reference thickness data. Therefore, (C) the comparison result shows that the thickness increasing portion 31a derived from the vibration of the displacement roller and the tape attached to the banknote. There is a thickness-increasing portion 31c from which it is derived. Here, based on the correction information 53, only the portion corresponding to the thickness data acquired immediately after the bill is inserted is corrected by adding the increase in thickness by the thickness increasing portion 31a to the threshold value 55 of the thickness data. As a result, since the thickness of the thickness increasing portion 31a is lower than the corrected threshold value 55, it is not determined that the thickness of the bill is abnormal, and only the thickness of the thickness increasing portion 31c exceeds the threshold 55, resulting in an abnormal thickness of the bill. It will be determined that there is.

As described above, by using the correction information 53, even when the component derived from the vibration of the displacement roller becomes large due to the high-speed transport of the bill, the thickness increasing portion 31a derived from the vibration of the displacement roller of the bill It is possible to prevent the thickness from being determined to be abnormal. Further, since it is possible to prevent confusion between the thickness increasing portion 31a caused by the vibration of the displacement roller and the thickness increasing portion 31c derived from the tape attached to the banknote, the setting of the threshold value 55 is tightened and the detection accuracy of the tape defect is improved. It is also possible to do.

It is preferable that a plurality of different correction amounts are set for the correction information 53 according to the transport conditions such as the type (denomination) of the bill, the orientation of the front and back sides, the traveling direction, and the transport speed. For example, in consideration of the orientation of the front and back sides of the bill, the correction amount may be different depending on whether the surface of the bill to be transported is on the reference roller side or the displacement roller side. Further, in consideration of the traveling direction of the banknote, the correction amount may be different depending on whether one end of the banknote to be transported enters first or the other end enters first. Further, the specific method of changing the correction amount in consideration of the banknote transport speed is not particularly limited, but the correction information 53 is set to a larger correction amount as the banknote transport speed is higher. Is preferable. The vibration of the displacement roller increases as the transport speed of the bills increases. Therefore, by setting a larger correction amount as the transport speed of the bills increases, the components derived from the vibration of the displacement roller can be accurately determined. Can be removed. The transport speed of banknotes is appropriately set in order to obtain desired performance. For example, there are a low-speed mode in which an image sensor performs high-precision image recognition and a high-speed mode in which high-speed processing is prioritized. In this case, the correction amount in the high-speed mode may be larger than the correction amount in the low-speed mode.

Further, the correction information 53 is set for at least a part of the banknotes, and for example, the position affected by the transport speed is confirmed for each banknote as follows, and the correction information 53 is determined based on the result. The correction portion and the correction amount are stored in the storage unit.
(1) Prepare a plurality of thickness data of the entire bill for each transport condition such as denomination, front / back orientation, traveling direction, and transport speed.
(2) Principal component analysis is performed on the thickness data of the entire banknote, and the position where the thickness varies greatly depending on the transport speed is calculated. For example, a position of a certain value or more of the first principal component, the second principal component, the third principal component, and the fourth principal component may be a position where the thickness varies greatly depending on the transport speed.

[Modification example]
In the above embodiment, the correction information according to the transport speed is stored in the storage unit, and the correction information is used when comparing the detected thickness data with the reference thickness data. However, the correction information according to the transport speed is stored. Instead of storing in the storage unit, a plurality of reference thickness data different for each transport speed may be stored in the storage unit. The plurality of reference thickness data different for each transport speed correspond to the reference thickness data corrected by the correction information of the above embodiment.

That is, it is a paper leaf thickness detecting device that detects the thickness of the paper leaves to be conveyed, and includes a reference roller and a displacement roller arranged to face each other, and the paper leaves pass between the reference roller and the displacement roller. A thickness detection unit that detects the thickness data of paper sheets by detecting the displacement amount of the displacement roller when the displacement roller is used, and a storage unit that stores a plurality of reference thickness data that differ depending on the transport speed of genuine paper sheets. , Specific reference thickness data is selected from the plurality of reference thickness data according to the transport speed of paper sheets, and the selected specific reference thickness data is compared with the detected thickness data to make paper. A paper leaf thickness detecting device including a thickness determining unit for determining the thickness of leaves is also an aspect of the present invention.

Further, it is a method for detecting the thickness of paper sheets to be conveyed, and the amount of displacement of the displacement roller when the paper sheets pass between the reference roller and the displacement roller arranged so as to face each other. A thickness detection step that detects the thickness data of paper leaves by detecting, and a specific reference thickness data selected from a plurality of reference thickness data according to the transport speed of the paper leaves, and the selected specific reference A method for detecting the thickness of paper leaves, which includes a thickness determination step for determining the thickness of paper leaves by comparing the thickness data with the detected thickness data, is also an aspect of the present invention.

The paper leaf thickness detecting device according to the above embodiment and the modified example can be mounted on the paper leaf processing device. Examples of the paper leaf processing device include a banknote processing device and a banknote inspection device.

(Configuration of banknote processing device)
An example of the configuration of the banknote processing apparatus will be described with reference to FIG. The banknote processing device 100 shown in FIG. 10 includes a hopper 110 capable of placing a plurality of banknotes, a transport path 111 for transporting the banknotes placed on the hopper 110, and a banknote identification device 112 for performing banknote identification processing. It includes an accumulating unit 113 for accumulating banknotes identified by the banknote identification device 112, and a reject unit 114 for separately accumulating banknotes satisfying predetermined conditions from other banknotes.

The bill identification device 112 includes a thickness detection sensor. By using the banknote identification device 112 built into the banknote processing device, it is possible to continuously process a plurality of banknotes and separate banknotes determined to be fake, non-defective or uncertain. The bill identification device 112 has, for example, a configuration in which a first photo sensor, an image sensor, a thickness detection sensor, a magnetic sensor, and a second photo sensor are arranged side by side along a bill transport path 111.

The first photo sensor detects the banknotes that are sequentially conveyed to the banknote identification device, and generates a banknote detection signal for determining the timing of starting detection of the banknotes in the banknote identification device. On the other hand, the second photo sensor detects that the bill has passed. When the banknotes are conveyed in the opposite directions, the second photosensor detects the arrival of the banknotes and the first photosensor detects the passage of the banknotes. As the first and second photosensors, light reflection type or light transmission type optical sensors are used. Instead of the first and second photo sensors, a sensor that mechanically detects the passage of banknotes may be provided. The bill detection signal can be used as a starting point for controlling the lighting of the light source in the image sensor.

The image sensor includes, for example, a light source such as an LED, an image sensor such as a CCD image sensor or a CMOS image sensor, and a rod lens array (an array of transparent tubular condensing lenses) for guiding light to the light source or the image sensor. And those including a light guide body. The type of image data captured by the image sensor is not particularly limited, and for example, a transmitted image with infrared light (transmitted infrared image data), a transmitted image with green light, a reflected image with infrared light, and a green image. Examples thereof include a reflected image with light, a reflected image with purple light, and a reflected image with far infrared light.

The magnetic sensor is used to detect magnetic information contained in banknotes. The magnetic sensor preferably has a plurality of magnetic detection elements (magnetic heads) arranged in a line. As the magnetic detection element, an element that outputs a change in magnetic flux density as a signal fluctuation (differential magnetic detection element) is preferably used, and specifically, a magnetoresistive element (MR element), a coil, and a fluxgate (FG). Element), magnetic impedance (MI element) and the like. The type of magnetoresistive element (MR element) may be an anisotropic magnetoresistive element (AMR element), a giant magnetoresistive element (GMR element), a tunnel magnetoresistive element (TMR element), or the like. Further, the magnetic detection element may output the strength (absolute value) of the magnetic flux density, and for example, a Hall element or the like may be used.

Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to the contents described in the above embodiments and modifications. Each configuration described in the embodiments and modifications may be appropriately deleted, added, modified, or combined as long as it does not deviate from the gist of the present invention.

As described above, the present invention relates to a paper leaf thickness detecting device and a paper leaf thickness detecting method having a function of collecting thickness data of paper sheets such as banknotes, and the thickness data used for identifying paper sheets. This is a useful technique in that it can accurately collect paper.

10 Thickness detection sensor 11 Reference roller 11a Rotating shaft 12 Displacement roller 13 Detection block 14 Supporting shaft 15 Holding block 16 Leaf spring 17 Displacement sensor 19 Scraper 20 Conveying mechanism 30 Control unit 31 Thickness data generating unit 31a, 31b, 31c Thickness increasing unit 33 Thickness determination unit 35 Identification processing unit 37 Transport control unit 50 Storage unit 51 Reference thickness data 51b Thickness increase unit 53 Correction information 53a Thickness increase unit 55 Threshold 57 Transport speed data 100 Bill processing device 110 Hopper 111 Transport path 112 Bill identification device 113 Accumulation Part 114 Reject part P Bill

Claims (9)

It is a paper leaf thickness detection device that detects the thickness of the paper leaves to be transported.
A reference roller and a displacement roller arranged to face each other are provided, and the thickness data of the paper leaves is detected by detecting the displacement amount of the displacement roller when the paper leaves pass between the reference roller and the displacement roller. Thickness detector and
A storage unit that stores reference thickness data for genuine paper sheets and correction information according to the transport speed of paper sheets,
A thickness determination unit that determines the thickness of paper leaves by comparing the detected thickness data with the reference thickness data using the correction information according to the transport speed of the paper leaves.
A paper leaf thickness detecting device characterized by being provided with. The paper leaf thickness detecting device according to claim 1, wherein the thickness determining unit corrects the detected thickness data based on the correction information. The paper leaf thickness detecting device according to claim 1, wherein the thickness determining unit corrects the reference thickness data based on the correction information. The thickness determination unit is characterized in that it determines the thickness of paper sheets by comparing the comparison result of the detected thickness data with the reference thickness data with the threshold value corrected by the correction information. The paper leaf thickness detecting device according to claim 1. The claim is characterized in that the correction information corrects a detection abnormality of thickness data immediately after the approach, which is detected when the conveyed paper sheets enter between the reference roller and the displacement roller. Item 4. The paper leaf thickness detecting device according to any one of Items 1 to 4. The paper leaf thickness detecting device according to any one of claims 1 to 5, wherein the correction information is set to a larger correction amount as the transport speed of the paper leaves is faster. It is a paper leaf thickness detection device that detects the thickness of the paper leaves to be transported.
A reference roller and a displacement roller arranged to face each other are provided, and the thickness data of the paper leaves is detected by detecting the displacement amount of the displacement roller when the paper leaves pass between the reference roller and the displacement roller. Thickness detector and
A storage unit that stores multiple reference thickness data that differs depending on the transport speed of genuine paper sheets,
A specific reference thickness data is selected from the plurality of reference thickness data according to the transport speed of the paper leaf, and the selected specific reference thickness data is compared with the detected thickness data. A thickness determination unit that determines the thickness of the type,
A paper leaf thickness detecting device characterized by being provided with. It is a method for detecting the thickness of paper sheets to be transported, and is a method for detecting the thickness of paper sheets.
A thickness detection step that detects the thickness data of the paper leaves by detecting the displacement amount of the displacement rollers when the paper leaves pass between the reference rollers and the displacement rollers arranged so as to face each other.
A thickness determination step for determining the thickness of paper sheets by comparing the detected thickness data with the reference thickness data of genuine paper sheets using correction information according to the transport speed of the paper sheets.
A method for detecting the thickness of paper leaves, which comprises. It is a method for detecting the thickness of paper sheets to be transported, and is a method for detecting the thickness of paper sheets.
A thickness detection step that detects the thickness data of the paper leaves by detecting the displacement amount of the displacement rollers when the paper leaves pass between the reference rollers and the displacement rollers arranged so as to face each other.
Paper leaves are selected from a plurality of reference thickness data according to the transport speed of the paper sheets, and the selected specific reference thickness data is compared with the detected thickness data. Thickness determination step to determine the thickness of
A method for detecting the thickness of paper leaves, which comprises.

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