Banknote dispensing machine

Abstract

To provide a banknote dispensing device that can detect double feeds more accurately. [Solution] A banknote dispensing device 1 comprises a dispensing banknote storage section 2, a banknote transport passage 3, a banknote dispensing outlet 4, a double-feed detection sensor 6, and a control unit 9. The double-feed detection sensor 6 outputs an output value corresponding to the amount of light shielding of the banknote 100 for each reading address N. The control unit 9 determines that a double-feed has occurred when the accumulated value obtained by sequentially accumulating the portion of the output value of the double-feed detection sensor 6 that exceeds the reference value of the reference data from the first reading address N0 exceeds a predetermined first threshold. The reference data is a combination of the reading address N of the double-feed detection sensor 6 and the reference value, and is created based on measurement data of the output value of the double-feed detection sensor 6 when there is no double-feed.

Description

[Technical Field] 【0001】 This invention relates to a banknote dispensing device. [Background technology] 【0002】 A banknote dispensing device is a device that dispenses banknotes, and in most cases, it is connected to or installed in vending machines, payment machines, POS registers, ticket machines, coin lockers, service equipment, etc. (hereinafter referred to as "vending machines, etc."). 【0003】 Some banknote dispensing devices transport and dispense banknotes one by one from the banknote storage area to the banknote dispensing opening. Furthermore, some of these banknote dispensing devices have a function to detect whether two or more banknotes are being transported stacked on top of each other (Patent Documents 1 and 2). 【0004】 Hereafter, the act of transporting two or more banknotes stacked on top of each other will be referred to as "double feeding," and the act of detecting whether or not such double feeding is occurring will be referred to as "double feeding detection." [Prior art documents] [Patent Documents] 【0005】 [Patent Document 1] Japanese Patent Publication No. 188252 / 1983 [Patent Document 2] Japanese Patent Publication No. 2000-172897 [Overview of the Initiative] [Problems that the invention aims to solve] 【0006】 The present invention aims to provide a banknote dispensing device that has a function to detect double feeding of banknotes, and that can detect double feeding more accurately. [Means for solving the problem] 【0007】 To solve the above problems, the present invention provides a banknote dispensing device comprising: a dispensing banknote storage unit for storing banknotes used for dispensing; a banknote transport passage which is a passage through which the dispensed banknotes are transported; a banknote dispensing outlet which is an outlet for the dispensed banknotes; a double-feed detection sensor for detecting whether or not the banknotes being transported in the banknote transport passage are double-feeded; and a control unit. The double-feed detection sensor outputs an output value corresponding to the amount of light shielding of the banknote for each read address in a first address section which is an address section from the first read address to the last read address. The control unit determines that a double-feed has occurred when the accumulated value obtained by sequentially accumulating the portion of the output value of the double-feed detection sensor that exceeds the reference value of the reference data from the first read address exceeds a predetermined first threshold. The reference data is data of a combination of the read address of the double-feed detection sensor and the reference value, and is created based on measurement data of the output value of the double-feed detection sensor when there is no double-feed. 【0008】 The banknote dispensing device further comprises a rejected banknote storage unit for storing rejected banknotes, a banknote sorting unit for sorting the banknotes dispensed from the banknote dispensing port from the banknotes to be stored in the rejected banknote storage unit, and a banknote passage detection sensor for detecting whether or not the banknotes being transported in the banknote transport passage have passed. The banknote passage detection sensor is positioned between the double-feed detection sensor and the banknote sorting unit. When the control unit determines that a double-feed has occurred, if the banknote passage detection sensor has not detected the passage of the banknotes, it performs a rejection process to sort the banknotes into the rejected banknote storage unit using the banknote sorting unit. If the banknote passage detection sensor has detected the passage of the banknotes, it performs an operation stop process to stop the banknote transport operation. Furthermore, the control unit may determine that a double feed has occurred when the cumulative value in a second address section, which is the address section from the first read address to the intermediate read address of the double feed detection sensor, exceeds a predetermined second threshold value that is smaller than the first threshold value. 【0009】 The banknote dispensing device may also be configured such that the control unit determines that a double feed has occurred when the average value of the output of the double feed detection sensor in a third address section, which is a predetermined address section of the double feed detection sensor, exceeds a predetermined third threshold. 【0010】 The banknote dispensing device may be configured such that the banknotes have a hologram portion, and the control unit determines that the hologram portion exists in the fourth address section when the minimum value of the output of the double-feed detection sensor in the fourth address section, which is a predetermined address section of the double-feed detection sensor, exceeds a predetermined fourth threshold. 【0011】 The banknote dispensing device may also determine that a double feed has occurred when the control unit determines that a double feed has occurred when the sum of adjacent differences in the output values ​​of the double feed detection sensor in a fifth address section, which is a predetermined address section of the double feed detection sensor, falls below a predetermined fifth threshold. 【0012】 The banknote dispensing device may determine that a double feed has occurred when the control unit determines that the average value of the output values ​​of the double feed detection sensor in a third address section, which is a predetermined address section of the double feed detection sensor, exceeds a predetermined third threshold, and the adjacent difference accumulated value of the output values ​​of the double feed detection sensor in a fifth address section, which is a predetermined address section of the double feed detection sensor, falls below a predetermined fifth threshold. [Effects of the Invention] 【0013】 According to the banknote dispensing device of the present invention, it is possible to detect double feeds more accurately. [Brief explanation of the drawing] 【0014】 [Figure 1] This is a longitudinal cross-sectional view showing the configuration of the banknote dispensing device of this embodiment. [Figure 2] This is an enlarged vertical cross-sectional view showing the configuration of the double-feed detection sensor, and shows the Ra region in Figure 1. [Figure 3]It is a diagram showing an example of an output value according to the amount of light shielding of a banknote by a double-feed detection sensor. [Figure 4] It is a diagram showing an example of an output value of a double-feed detection sensor when a banknote is double-fed. [Figure 5] It is a diagram for explaining a conventional double-feed detection algorithm. [Figure 6A] It is a diagram for explaining the double-feed detection algorithm of the present embodiment, and shows an example of an output value of the double-feed detection sensor when the banknote is facing the first direction. [Figure 6B] It is a diagram for explaining the double-feed detection algorithm of the present embodiment, and shows an example of an output value of the double-feed detection sensor when the banknote is facing the second direction. [Figure 7A] It is a diagram for explaining the double-feed detection algorithm of the present embodiment, and shows a comparison between the output value of the double-feed detection sensor during non-double-feed and the reference data in the first direction. [Figure 7B] It is a diagram for explaining the double-feed detection algorithm of the present embodiment, and shows a comparison between the output value of the double-feed detection sensor during non-double-feed and the reference data in the second direction. [Figure 7C] It is a diagram for explaining the double-feed detection algorithm of the present embodiment, and shows a comparison between the output value of the double-feed detection sensor during double-feed and the reference data in the first direction. [Figure 7D] It is a diagram for explaining the double-feed detection algorithm of the present embodiment, and shows a comparison between the output value of the double-feed detection sensor during double-feed and the reference data in the second direction. [Figure 8] It is a flowchart showing an example of the flow of processing related to double-feed detection of a banknote payout device. [Figure 9] It is a diagram for explaining the method of interval average value determination. [Figure 10] It is a front view showing an example of a banknote having a hologram portion. [Figure 11] It is a diagram for explaining the method of hologram determination. [Figure 12] It is a diagram for explaining the method of adjacent difference determination. 【Embodiments for Carrying Out the Invention】 【0015】 Hereinafter, with reference to the drawings, one embodiment of the present invention (hereinafter referred to as "this embodiment") will be described. 【0016】 Figure 1 is a longitudinal cross-sectional view showing the configuration of the banknote dispensing device 1 of this embodiment. 【0017】 The banknote dispensing device 1 comprises a dispensing banknote storage section 2, a banknote transport passage 3, a banknote dispensing outlet 4, a rejected banknote storage section 5, a double-feed detection sensor 6, a banknote passage detection sensor 7, a storage unit 8, and a control unit 9. 【0018】 The dispensing banknote storage section 2 stores the banknotes 100 to be dispensed. When dispensing banknotes 100, the banknote dispensing device 1 dispenses the banknotes 100 one by one from the dispensing banknote storage section 2. 【0019】 Banknote dispensing slot 4 is the exit for the banknotes 100 that are dispensed. 【0020】 The rejected banknote storage section 5 stores the rejected banknotes 100. 【0021】 The banknote transport passage 3 is a passage through which banknotes 100 are transported. Banknotes 100 dispensed from the dispensing banknote storage section 2 are transported through the banknote transport passage 3 to the banknote dispensing outlet 4 or the rejected banknote storage section 5. The transport of banknotes 100 is performed by a transport mechanism having a drive means and a transport belt. The banknote transport passage 3 has a banknote sorting section 31 that separates the banknotes 100 to be dispensed from the banknotes 100 to be rejected. 【0022】 The double-feed detection sensor 6 is a sensor for detecting whether or not banknotes 100 being transported in the banknote transport passage 3 are being double-feeded. The double-feed detection sensor 6 is located near the banknote transport passage 3. The specific configuration of this double-feed detection sensor 6 will be described later. 【0023】 The banknote passage detection sensor 7 is a sensor for detecting whether or not banknotes 100 being transported in the banknote transport passage 3 have passed through. The banknote passage detection sensor 7 is positioned along the banknote transport passage 3, between the double-feed detection sensor 6 and the banknote sorting unit 31, and detects the presence or absence of banknotes 100 at that position. The banknote passage detection sensor 7 is composed of, for example, an optical sensor having a light-emitting element and a light-receiving element. 【0024】 The control unit 9 controls the processing in the banknote dispensing device 1. The control unit 9 is composed of, for example, a CPU (Central Processing Unit). In this specification, the processing described as being performed by the banknote dispensing device 1 can be said to be performed by this control unit 9. 【0025】 The memory unit 8 stores programs and calculation parameters used by the control unit 9. The memory unit 8 also stores reference data used in the double-feed detection algorithm of this embodiment, which will be described later. The memory unit 8 is composed of, for example, RAM (Random Access Memory) and ROM (Read Only Memory). 【0026】 Next, we will describe the specific configuration of the double-feed detection sensor 6. 【0027】 Figure 2 is an enlarged vertical cross-sectional view showing the configuration of the double-feed detection sensor 6, and shows the Ra region in Figure 1. 【0028】 The double-feed detection sensor 6 has a light-emitting element 61 and a light-receiving element 62. The light-emitting element 61 and the light-receiving element 62 are arranged opposite each other across the banknote transport passage 3. 【0029】 The double-feed detection sensor 6 illuminates one side of a banknote 100 in the banknote transport passage 3 with light emitted from the light-emitting element 61, and the light that passes through the banknote 100 and is emitted from the other side is received by the light-receiving element 62. With this configuration, the double-feed detection sensor 6 outputs an output value corresponding to the amount of light blocked when the banknote passes through the optical path between the light-emitting element 61 and the light-receiving element 62. Here, the output value corresponding to the amount of light blocked means that the output value becomes larger as the amount of light blocked increases. 【0030】 Figure 3 shows an example of the output value of the double-feed detection sensor 6 according to the amount of light shielding on the banknotes 100. 【0031】 After the leading edge of the banknote 100 being transported in the banknote transport passage 3 reaches the double-feed detection sensor 6, an output value corresponding to the amount of light blocking on the double-feed detection sensor 6 is acquired at predetermined intervals. As a result, the banknote dispensing device 1 acquires the output values ​​of the double-feed detection sensor 6 at multiple reading addresses N along the sensor reading line L set on the surface of the banknote 100. 【0032】 The sensor reading line L is a line that indicates the area on the banknote 100 where the output value of the double-feed detection sensor 6 is read. The position of the sensor reading line L on the banknote 100 can be arbitrarily set by adjusting the positional relationship between the light-emitting element 61 and the light-receiving element 62 of the double-feed detection sensor 6 and the banknote transport passage 3. 【0033】 The reading address N is an address that corresponds one-to-one with the position on the banknote 100 where the output value of the double-feed detection sensor 6 is read. In the banknote dispensing device 1 of this embodiment, the reading address N is an integer value, and 1 is added each time the device moves to the next reading address N. Here, the first reading address N is N0, and the final reading address N is N max Therefore, the read address N is from N0 to N max It is set as an integer value within the range. In this specification, the interval between two read addresses N is referred to as the address interval. 【0034】 Furthermore, the banknote dispensing device 1 of this embodiment uses a stepping motor as the driving means for the banknote transport mechanism, and controls the transport speed of the banknotes 100 by the pulse signal input to the stepping motor. In the banknote dispensing device 1 of this embodiment, the output value of the double-feed detection sensor 6 is acquired at the timing of the input of this pulse signal. In other words, each reading address N of the banknote dispensing device 1 of this embodiment corresponds one-to-one with each pulse signal input to the driving means of the transport mechanism. 【0035】 Furthermore, the banknote dispensing device 1 of the present invention is not limited to using a stepping motor as the driving means for the banknote transport mechanism 100. For example, the banknote dispensing device 1 of the present invention may use a DC motor as the driving means for the banknote transport mechanism 100. In this case, the transport of the banknotes 100 is controlled by feedback control using an encoder sensor that generates a pulse signal corresponding to the rotation amount of the DC motor. In this case, each reading address N of the banknote dispensing device 1 can be made to correspond one-to-one with each pulse signal emitted by the encoder sensor. 【0036】 Figure 4 shows an example of the output value of the double-feed detection sensor 6 when 100 banknotes are double-feeded. 【0037】 The amount of light blocked by two or more banknotes 100 during a double feed is greater than the amount of light blocked by one banknote 100 during a non-double feed. Therefore, the output value of the double feed detection sensor 6 corresponding to the amount of light blocked by the banknotes 100 during a double feed is greater than the output value of the double feed detection sensor 6 corresponding to the amount of light blocked by the banknotes 100 during a non-double feed. 【0038】 Next, we will explain the double-feed detection algorithm performed by the control unit 9 of the banknote dispensing device 1. 【0039】 First, let's explain the conventional double-feed detection algorithm. 【0040】 Figure 5 is a diagram illustrating a conventional double-feed detection algorithm. 【0041】 Conventional double-feed detection algorithms determine whether a double feed has occurred by comparing the output value of the double-feed detection sensor 6 with a certain reference level. Specifically, conventional double-feed detection algorithms use the portion of the output value of the double-feed detection sensor 6 at each reading address N that exceeds a certain reference level (the portion shown by the shaded area in Figure 5) within a predetermined section N0 to N of the reading address N. max The calculation is performed over a certain period. When the resulting cumulative value exceeds a predetermined threshold, it is determined that a double feed has occurred. 【0042】 The inventors of this invention have found, through their research, that the conventional double-feed detection algorithm described above has the following two problems. 【0043】 The first problem is that when the light-blocking properties of banknotes are low, the sensitivity of the double-feed detection system decreases. This problem arises because, when the light-blocking properties of banknotes are low, the light-blocking properties remain relatively low even when a double-feed occurs. 【0044】 The second problem is that if a banknote has a hologram (see Figure 10), it may be mistakenly identified as a double-feed even if it is not. This problem arises because the amount of light obscured by the hologram increases. 【0045】 The double-feed detection algorithm of this embodiment overcomes the problems of the conventional double-feed detection algorithm described above. 【0046】 The algorithm for detecting duplicate feeds in this embodiment will be described below. 【0047】 Figures 6A and 6B, and Figures 7A to 7D are diagrams illustrating the double-feed detection algorithm of this embodiment. 【0048】 Figure 6A shows an example of the output value of the double-feed detection sensor 6 when the banknote is facing the first direction, and Figure 6B shows an example of the output value of the double-feed detection sensor when the banknote 100 is facing the second direction. 【0049】 Figure 7A shows a comparison between the output value of the double feed detection sensor 6 during non-double feed and the reference data for the first direction; Figure 7B shows a comparison between the output value of the double feed detection sensor 6 during non-double feed and the reference data for the second direction; Figure 7C shows a comparison between the output value of the double feed detection sensor 6 during double feed and the reference data for the first direction; and Figure 7D shows a comparison between the output value of the double feed detection sensor 6 during double feed and the reference data for the second direction. 【0050】 The double feed detection algorithm of this embodiment determines whether a double feed has occurred by comparing the output value of the double feed detection sensor 6 with reference data. Specifically, the double feed detection algorithm of this embodiment sequentially accumulates the portion of the output value of the double feed detection sensor 6 at each reading address N that exceeds the reference value of the reference data (the portion shown by the shaded area in Figures 7B to 7C), starting from the first reading address N0. When the accumulated value obtained from this accumulation exceeds a predetermined threshold, it is determined that a double feed has occurred. 【0051】 The reference data is a combination of the reading address N of the double-feed detection sensor 6 and a reference value. Unlike the reference level of conventional double-feed detection algorithms, the reference value of the reference data takes a different value for each reading address N of the double-feed detection sensor 6. The reference data is stored in the storage unit 8 of the banknote dispensing device 1. 【0052】 Reference data is created based on measurement data of the output value of the double-feed detection sensor 6 during non-double-feed operation. Specifically, the output value of the double-feed detection sensor 6 is measured for each reading address N for a large number of banknotes 100. The maximum value of the output value of the double-feed detection sensor 6 at each reading address N is then set as the reference value corresponding to that reading address N in the reference data. In addition, abnormal values ​​may be excluded when extracting the maximum value of the output value of the double-feed detection sensor 6. Furthermore, the characteristics of the light-emitting element 61 and the light-receiving element 62 of the double-feed detection sensor 6 are affected by ambient temperature. Therefore, it is preferable that the measurement of the output value of the double-feed detection sensor 6 described above be performed under multiple temperature conditions. 【0053】 Reference data is created for each direction in which the banknotes 100 are facing within the banknote transport passage 3. There are four directions in which the banknotes 100 are facing within the banknote transport passage 3: the 1st direction to the 4th direction. 【0054】 The first direction is when the front surface of the banknote 100 faces the light-emitting element 61 of the double-feed detection sensor 6, and the left side of the front surface of the banknote 100 is the leading side of the transport (see Figure 6A). The second direction is when the front surface of the banknote 100 faces the light-emitting element 61 of the double-feed detection sensor 6, and the right side of the front surface of the banknote 100 is the leading side of the transport (see Figure 6B). The third direction is when the back surface of the banknote 100 faces the light-emitting element 61 of the double-feed detection sensor 6, and the right side of the back surface of the banknote 100 is the leading side of the transport. The fourth direction, which is the direction in the fourth pattern, is when the back surface of the banknote 100 faces the light-emitting element 61 of the double-feed detection sensor 6, and the left side of the back surface of the banknote 100 is the leading side. 【0055】 In the banknote dispensing device 1 of this embodiment, the sensor reading line L is set to be located in the center of the short side of the banknote 100. As a result, the output values ​​of each reading address N of the double-feed detection sensor 6 are substantially the same in the first direction and the third direction. Similarly, the output values ​​of each reading address N of the double-feed detection sensor 6 are substantially the same in the second direction and the fourth direction. Therefore, the banknote dispensing device 1 of this embodiment uses only two reference data sets, one for the first direction and one for the second direction. 【0056】 Unlike the banknote dispensing device 1 of this embodiment, if the sensor reading line L is set to a position offset from the center of the banknote 100 in the short-side direction, four reference data sets corresponding to the first, second, third, and fourth directions of the banknote 100 are required. Furthermore, if new and old banknotes are used together, reference data for both new and old banknotes are required. 【0057】 As described above, the double-feed detection algorithm of this embodiment determines that a double-feed has occurred when the cumulative value of the portion of the output value of the double-feed detection sensor 6 at each reading address N that exceeds the reference value of the reference data (the portion shown by the shaded lines in Figures 7B to 7C) exceeds a predetermined threshold. In the banknote dispensing device 1 of this embodiment, this cumulative value is calculated for the reference data of the first direction and the second direction respectively (see Figures 7A to 7D). Then, in the banknote dispensing device 1 of this embodiment, a double-feed has occurred when both the cumulative value related to the reference data of the first direction and the cumulative value related to the reference data of the second direction exceed a predetermined threshold. 【0058】 Furthermore, when using three or more reference data sets, a double feed is determined when the cumulative values ​​related to all of those reference data sets exceed a predetermined threshold. 【0059】 The calculation of the cumulative value for each reading address N of the double-feed detection sensor 6 and the determination of a double-feed are performed sequentially while the banknote 100 is passing between the light-emitting element 61 and the light-receiving element 62 of the double-feed detection sensor 6. When the banknote dispensing device 1 detects a double-feed, it performs a process to prevent the banknote 100 from being dispensed from the banknote dispensing port 4. 【0060】 Furthermore, the banknote dispensing device 1 of this embodiment performs different processing depending on the timing of the detection of a double feed. Specifically, when a double feed is detected, the banknote dispensing device 1 of this embodiment performs rejection processing if it is possible to do so, and performs operation stop processing if it is not possible to perform rejection processing. Rejection processing is the process of the banknote sorting unit 31 sorting the banknotes 100 into the rejected banknote storage unit 5 instead of the banknote dispensing port 4. Operation stop processing is the process of stopping the transport operation of the banknotes 100. 【0061】 Whether or not it is the right time to perform a rejection is determined by whether or not the passage of the banknote 100 is detected by the banknote passage detection sensor 7, which is located between the double-feed detection sensor 6 and the banknote sorting unit 31. Specifically, if the passage of the banknote 100 is not detected by the banknote passage detection sensor 7 (i.e., the leading edge of the banknote 100 has not reached the position of the banknote passage detection sensor 7), it is determined that it is the right time to perform a rejection. Conversely, if the passage of the banknote 100 is detected by the banknote passage detection sensor 7 (i.e., the leading edge of the banknote 100 has reached the position of the banknote passage detection sensor 7), it is determined that it is not the right time to perform a rejection. 【0062】 Furthermore, in the banknote dispensing device 1 of this embodiment, the threshold value for the cumulative value used for double-feed detection is set in two stages. Specifically, in the banknote dispensing device 1 of this embodiment, in addition to the first threshold value set in accordance with the first address section I1, a second threshold value is set in accordance with the second address section I2. The first address section I1 ranges from the first read address N0 to the final read address N max The first address interval is up to the first read address, and the second address interval I2 is the address interval from the first read address N0 to the intermediate read address N2 (see Figures 6A and 6B). The value of the second threshold is set to be smaller than that of the first threshold. 【0063】 In other words, the banknote dispensing device 1 of this embodiment determines that a banknote has been double-fed when the cumulative value for double-fed determination in the first address section I1 exceeds the first threshold, and also determines that a banknote has been double-fed when the cumulative value for double-fed determination in the second address section I2 exceeds the second threshold. 【0064】 Furthermore, the second address section I2 is configured so that when the cumulative value for determining the double transmission in the second address section I2 exceeds the second threshold and it is determined that a double transmission has occurred, the aforementioned rejection process can be performed. 【0065】 With this configuration, the banknote dispensing device 1 of this embodiment is capable of detecting double feeding early and performing appropriate rejection processing. 【0066】 Figure 8 is a flowchart showing an example of the processing flow related to double-feed detection in the banknote dispensing device 1. 【0067】 When the double-feed detection sensor 6 detects the passage of banknotes 100, the banknote dispensing device 1 starts processing related to double-feed detection. 【0068】 When the banknote dispensing device 1 starts processing related to double-feed detection, it sets the reading address N of the double-feed detection sensor 6 to the initial reading address N0 (S1). 【0069】 Next, the banknote dispensing device 1 calculates the cumulative value for the double-feed determination mentioned above (S2). 【0070】 Next, the banknote dispensing device 1 determines whether the reading address N exceeds the upper limit of the second address section I2, namely reading address N2 (S3). 【0071】 In determining whether the read address N exceeds the upper limit read address N2 of the second address section I2 (S3), if the read address N does not exceed the upper limit read address N2 of the address section I2, the banknote dispenser 1 determines whether the accumulated value for double-feed determination exceeds the second threshold (S4). If the accumulated value for double-feed determination does not exceed the second threshold, the banknote dispenser 1 advances the read address N by one (S5), then returns to the process of calculating the accumulated value for double-feed determination (S2), and repeats the same process. 【0072】 In the determination (S3) of whether the reading address N exceeds the upper limit reading address N2 of the second address section I2, if the reading address N exceeds the upper limit reading address N2 of the address section I2, the bill paying device 1 determines whether the integrated value for duplicate transmission determination exceeds the first threshold value (S6). Here, if the integrated value for duplicate transmission determination does not exceed the first threshold value, the bill paying device 1 determines whether the reading address N exceeds the upper limit reading address N max of the first address section I1 (S7). 【0073】 In the determination (S7) of whether the reading address N exceeds the upper limit reading address N max of the first address section I1, if the reading address N does not exceed the upper limit reading address N max of the first address section I1, after the bill paying device 1 performs the process of advancing the reading address N by one (S5), it returns to the process of calculating the integrated value for duplicate transmission determination (S2) again and repeats the same process. 【0074】 In the determination (S7) of whether the reading address N exceeds the upper limit reading address N max of the first address section I1, if the reading address N exceeds the upper limit reading address N max of the first address section I1, the bill paying device 1 continues the process for paying out the bill 100 (S8) and ends the process related to duplicate transmission detection. 【0075】 In the determination of whether the cumulative value for double-feed determination exceeds the second threshold (S4) and the determination of whether the cumulative value for double-feed detection exceeds the first threshold (S6), if the cumulative value for double-feed determination exceeds the first threshold or the second threshold, the banknote dispensing device 1 determines whether the banknote passage detection sensor 7 has detected the passage of banknotes 100 (S9). Here, if the banknote dispensing device 1 has not detected the passage of banknotes 100, it performs the rejection process described above (S10) to terminate the double-feed detection process, and if the banknote passage detection sensor 7 has not detected the passage of banknotes 100, it performs the operation stop process described above (S11) to terminate the double-feed detection process. 【0076】 In summary, the banknote dispensing device 1 of this embodiment comprises a banknote storage section 2, a banknote transport passage 3, a banknote dispensing outlet 4, a double-feed detection sensor 6, and a control unit 9. The double-feed detection sensor 6 reads from the first reading address N0 to the final reading address N max In the first address section I1, which is the address section up to N, an output value corresponding to the light-shielding amount of the banknote is output for each read address N. The control unit 9 determines that a double feed has occurred when the accumulated value obtained by sequentially accumulating the portion of the output value of the double feed detection sensor 6 that exceeds the reference value of the reference data from the first read address N0 exceeds a predetermined first threshold. The reference data is data of the combination of the read address N of the double feed detection sensor 6 and the reference value, and is created based on measurement data of the output value of the double feed detection sensor 6 when there is no double feed. 【0077】 Such a banknote dispensing device 1 can perform more accurate double-feed detection. 【0078】 Furthermore, the banknote dispensing device 1 of this embodiment further comprises a rejected banknote storage unit 5, a banknote sorting unit 31, and a banknote passage detection sensor 7. The banknote passage detection sensor 7 is positioned between the double-feed detection sensor 6 and the banknote sorting unit 31. When the control unit 9 determines that a double-feed has occurred, if the banknote passage detection sensor 7 has not detected the passage of the banknote 100, it performs a rejection process to sort the banknote 100 into the rejected banknote storage unit 5 using the banknote sorting unit 31. If the banknote passage detection sensor 7 has detected the passage of the banknote 100, it performs an operation stop process to stop the transport operation of the banknote 100. In addition, the control unit 9 determines that a double-feed has occurred when the cumulative value for the double-feed determination described above exceeds a predetermined second threshold, which is smaller than the first threshold, in the second address section I2, which is the address section from the first reading address N0 to the intermediate reading address N2 of the double-feed detection sensor 6. 【0079】 This type of banknote dispensing device 1 is capable of detecting double feeding early and performing appropriate rejection processing. 【0080】 Furthermore, the inventors of this application have found through their research that, in addition to the determination by the double-feed detection algorithm described above, more accurate double-feed detection is possible by performing interval average determination, adjacent difference accumulation determination, or hologram determination as described below. 【0081】 First, let's explain how to determine the average value of an interval. 【0082】 Figure 9 is a diagram illustrating the method for determining the average value of an interval. 【0083】 The interval average value determination determines whether or not a double feed occurs based on the interval average value, which is the average value of the output values ​​of the double feed detection sensor 6 in the third address interval I3, which is a predetermined address interval. In the example shown in Figure 9, the read address N included in the second address interval I2 is 31 From N 32 The address range up to that point is set as the third address range I3. 【0084】 As described above, the interval average value used for interval averaging is the average value of the output values ​​of the double-feed detection sensor 6 in the third address interval I3. For example, read address N belonging to a specific address interval I3. 31 ~N 32 If the output values ​​in the equation are x1, x2, x3, x4, and x5, the interval mean is calculated using the formula (interval mean) = (x1 + x2 + x3 + x4 + x5) / 5. 【0085】 In interval average value determination, a double feed is determined when the interval average value exceeds a predetermined third threshold. 【0086】 It is preferable that the address section has small variation in the amount of light shielding during non-double feeding and a large difference in the amount of light shielding between non-double feeding and double feeding. In particular, the third address section I3 for interval average determination is preferably an address section with a large difference in the amount of light shielding between non-double feeding and double feeding in the first to fourth directions of the banknote 100, in directions where it is difficult to determine double feeding using the double feeding detection algorithm described above. 【0087】 Furthermore, it is preferable that the third address interval I3 for interval average determination is included within the aforementioned second address interval I2, so that rejection processing can be performed when a double transmission is determined by interval average determination. 【0088】 Thus, by adding the above-mentioned interval average value determination process to the double-feed detection algorithm, more accurate double-feed detection becomes possible. 【0089】 Next, I will explain hologram detection. 【0090】 Figure 10 is a front view showing an example of a banknote 100 having a hologram portion 101. Figure 11 is a diagram illustrating a method for determining the hologram. 【0091】 The hologram determination determines whether a banknote 100 having a hologram portion 101 as shown in Figure 10 has a hologram portion 101 in a predetermined address interval, which is a fourth address interval I4. 【0092】 The fourth address interval I4 for hologram detection is set to correspond to the region where the hologram portion 101 exists in any of the first to fourth directions of the banknote 100. 【0093】 In the example shown in Figure 11, the reading address N corresponds to the region where the hologram portion 101 exists in the banknote 100 in the first direction. 41 From N 42 The address range up to that point is set as the fourth address range I4. 【0094】 The presence or absence of the hologram portion 101 in the fourth address section I4 is determined using the hologram determination value, which is the minimum output value of the double-feed detection sensor 6 in that fourth address section I4. For example, read address N belonging to the address section I4 for hologram determination. 41 ~N 42 If the output values ​​are x1, x2, x3, x4, and x5, the hologram determination value is calculated using the formula (hologram determination value) = min(x1, x2, x3, x4, x5). 【0095】 In hologram detection, if the hologram detection value exceeds a predetermined fourth threshold, it is determined that the hologram portion 101 exists in the fourth address interval I4. Conversely, if the hologram detection value does not exceed the fourth threshold, it is determined that the hologram portion 101 does not exist in the fourth address interval I4. 【0096】 This hologram detection allows us to narrow down the direction in which the banknote 100 is facing within the banknote transport passage 3. In the example shown in Figure 11, if it is determined that the hologram portion 101 is present in the fourth address section I4, the banknote 100 can be identified as facing either the first or third direction. If it is determined that the hologram portion 101 is not present in the fourth address section I4, the banknote 100 can be identified as facing either the second or fourth direction. 【0097】 Furthermore, if it is determined that banknote 100 is facing the first or third direction, more accurate double-feed detection is possible by using only the reference data for the first and third directions as reference data to compare with the output value of the double-feed detection sensor 6. Similarly, if it is determined that banknote 100 is facing the second or fourth direction, more accurate double-feed detection is possible by using only the reference data for the second and fourth directions as reference data to compare with the output value of the double-feed detection sensor 6. 【0098】 Thus, by adding the hologram detection process and the limitation of reference data based on the detection result to the aforementioned double-feed detection algorithm, more accurate double-feed detection becomes possible. 【0099】 Next, we will explain how to determine the value of the adjacent difference accumulation. 【0100】 Figure 12 is a diagram illustrating the method for determining the adjacent difference cumulative value. 【0101】 The adjacent difference accumulation value determination determines whether or not a double feed occurs based on the adjacent difference accumulation value of the output value of the double feed detection sensor 6 in the fifth address section I5, which is a predetermined address section. In the example shown in Figure 12, the read address N included in the second address section I2 is 51 From N 52 The address range up to that point is set as the fifth address range, I5. 【0102】 As described above, the adjacent difference integrated value used for adjacent difference integrated value determination is the adjacent difference integrated value of the output values ​​of the double-feed detection sensor 6 in the fifth address interval I5. For example, if there are five output values ​​x1, x2, x3, x4, and x5 at the read addresses belonging to a specific address interval I5, the adjacent difference integrated value is calculated by the formula (adjacent difference integrated value) = |x2-x1| + |x3-x2| + |x4-x3| + |x5-x4|. 【0103】 In the adjacent difference accumulation value determination, a double feed is determined when the adjacent difference accumulation value falls below a predetermined threshold, which is a fifth threshold. 【0104】 The value of the adjacent difference accumulation tends to be larger in areas where printed characters or patterns exist, and smaller in blank areas. Furthermore, the value of the adjacent difference accumulation tends to be smaller during double feeding than during non-double feeding. 【0105】 The fifth address interval I5 for determining the adjacent difference cumulative value is preferably an address interval where the difference between the adjacent difference cumulative value in the case of non-double feeding and the case of double feeding is large, among the combinations of two directions from the first to fourth directions of the banknote 100, in which it is difficult to determine double feeding using the double feeding detection algorithm described above. 【0106】 Furthermore, this adjacent difference accumulation determination can be combined with the interval average determination described above. Specifically, a double feed may be determined when the adjacent difference accumulation value in the adjacent difference accumulation determination falls below the fifth threshold, and the interval average value in the interval average determination exceeds the third threshold. This enables more accurate double feed detection according to the properties of various banknotes 100. 【0107】 As described above, in addition to the double-feed detection algorithm mentioned earlier, performing the interval average value determination, adjacent difference accumulation value determination, or hologram determination will enable more accurate double-feed detection. 【0108】 Although one embodiment of the present invention has been described above, the electronic payment terminal device of the present invention is not limited to the above-described embodiment. The electronic payment terminal device of the present invention can be implemented in various other forms, and various omissions, substitutions, modifications, and additions can be made without departing from the spirit of the invention. 【0109】 Furthermore, the present invention can also take the following configuration. [Item 1] A banknote dispensing device comprising: a dispensing banknote storage section for storing banknotes to be dispensed; a banknote transport passage which is a passage through which the dispensed banknotes are transported; a banknote dispensing outlet which is an exit for the dispensed banknotes; a double-feed detection sensor for detecting whether or not the banknotes being transported in the banknote transport passage are double-feeded; and a control unit, The double-feed detection sensor outputs an output value corresponding to the amount of light shielding on the banknote for each read address in a first address section, which is the address section from the first read address to the last read address. The control unit determines that a double feed has occurred when the accumulated value obtained by sequentially accumulating the portion of the output value of the double feed detection sensor that exceeds the reference value of the reference data, starting from the first read address, exceeds a predetermined first threshold. The aforementioned reference data is a combination of the read address of the double-feed detection sensor and the reference value, and is created based on measurement data of the output value of the double-feed detection sensor during non-double-feed situations. Banknote dispensing machine. [Item 2] The banknote dispensing device described in item 1, The system further includes a rejected banknote storage section for storing rejected banknotes, a banknote sorting section for sorting the banknotes dispensed from the banknote dispensing outlet from the banknotes to be stored in the rejected banknote storage section, and a banknote passage detection sensor for detecting whether or not banknotes being transported in the banknote transport passage are passing through. The banknote passage detection sensor is positioned between the double-feed detection sensor and the banknote sorting unit. When the control unit determines that a double feed has occurred, if the banknote passage detection sensor has not detected the passage of the banknotes, it performs a rejection process to sort the banknotes into the reject banknote storage section using the banknote sorting unit. If the banknote passage detection sensor has detected the passage of the banknotes, it performs an operation stop process to stop the banknote transport operation. Banknote dispensing machine. [Item 3] A banknote dispensing device as described in item 1 or 2, The control unit determines that a double feed has occurred when the cumulative value in a second address section, which is the address section from the first read address to the intermediate read address of the double feed detection sensor, exceeds a predetermined second threshold that is smaller than the first threshold. [Item 4] A banknote dispensing device described in any one of items 1 to 3, The control unit determines that a double feed has occurred when the average value of the output of the double feed detection sensor in a third address section, which is a predetermined address section of the double feed detection sensor, exceeds a predetermined third threshold. [Item 5] A banknote dispensing device described in any one of items 1 to 4, The aforementioned banknote has a hologram portion, The control unit determines that the hologram portion exists in the fourth address section when the minimum value of the output of the double feed detection sensor in the fourth address section, which is a predetermined address section of the double feed detection sensor, exceeds a predetermined fourth threshold. Banknote dispensing machine. [Item 6] A banknote dispensing device described in any one of items 1 to 5, The control unit determines that a double feed has occurred when the cumulative adjacent difference value of the output value of the double feed detection sensor in a fifth address section, which is a predetermined address section of the double feed detection sensor, falls below a predetermined fifth threshold. [Item 7] A banknote dispensing device described in any one of items 1 to 5, The control unit determines that a double feed has occurred when the average value of the output values ​​of the double feed detection sensor in a third address section, which is a predetermined address section of the double feed detection sensor, exceeds a predetermined third threshold, and the adjacent difference accumulated value of the output values ​​of the double feed detection sensor in a fifth address section, which is a predetermined address section of the double feed detection sensor, falls below a predetermined fifth threshold. [Explanation of Symbols] 【0110】 1. Banknote dispensing device 2. Dispensing banknote storage section 3. Banknote transport passage 31 Banknote Sorting Department 4. Banknote dispensing slot 5. Rejected banknote storage compartment 6. Double feed detection sensor 61 Light-emitting element 62 Photodetector 7. Banknote passage detection sensor 8 Memory section 9. Control Unit 100 banknote 101 Hologram section L Sensor reading line N Read Address

Claims

[Claim 1] A banknote dispensing device comprising: a dispensing banknote storage section for storing banknotes to be dispensed; a banknote transport passage which is a passage through which the dispensed banknotes are transported; a banknote dispensing outlet which is an exit for the dispensed banknotes; a double-feed detection sensor for detecting whether or not the banknotes being transported in the banknote transport passage are double-feeded; and a control unit, The double-feed detection sensor outputs an output value corresponding to the amount of light shielding on the banknote for each read address in a first address section, which is the address section from the first read address to the last read address. The control unit determines that a double feed has occurred when the accumulated value obtained by sequentially accumulating the portion of the output value of the double feed detection sensor that exceeds the reference value of the reference data, starting from the first read address, exceeds a predetermined first threshold. The aforementioned reference data is a combination of the read address of the double-feed detection sensor and the reference value, and is created based on measurement data of the output value of the double-feed detection sensor during non-double-feed situations. Banknote dispensing machine. [Claim 2] A banknote dispensing device according to claim 1, The system further includes a rejected banknote storage section for storing rejected banknotes, a banknote sorting section for sorting the banknotes dispensed from the banknote dispensing outlet from the banknotes to be stored in the rejected banknote storage section, and a banknote passage detection sensor for detecting whether or not banknotes being transported in the banknote transport passage are passing through. The banknote passage detection sensor is positioned between the double-feed detection sensor and the banknote sorting unit. When the control unit determines that a double feed has occurred, if the banknote passage detection sensor has not detected the passage of the banknotes, it performs a rejection process to sort the banknotes into the reject banknote storage section using the banknote sorting unit. If the banknote passage detection sensor has detected the passage of the banknotes, it performs an operation stop process to stop the banknote transport operation. Banknote dispensing machine. [Claim 3] A banknote dispensing device according to claim 2, The control unit determines that a double feed has occurred when the cumulative value in a second address section, which is the address section from the first read address to the intermediate read address of the double feed detection sensor, exceeds a predetermined second threshold that is smaller than the first threshold. [Claim 4] A banknote dispensing device according to claim 1, The control unit determines that a double feed has occurred when the average value of the output of the double feed detection sensor in a third address section, which is a predetermined address section of the double feed detection sensor, exceeds a predetermined third threshold. [Claim 5] A banknote dispensing device according to claim 1, The aforementioned banknote has a hologram portion, The control unit determines that the hologram portion exists in the fourth address section when the minimum value of the output of the double feed detection sensor in the fourth address section, which is a predetermined address section of the double feed detection sensor, exceeds a predetermined fourth threshold. Banknote dispensing machine. [Claim 6] A banknote dispensing device according to claim 1, The control unit determines that a double feed has occurred when the cumulative adjacent difference value of the output value of the double feed detection sensor in a fifth address section, which is a predetermined address section of the double feed detection sensor, falls below a predetermined fifth threshold. [Claim 7] A banknote dispensing device according to claim 1, The control unit determines that a double feed has occurred when the average value of the output values ​​of the double feed detection sensor in a third address section, which is a predetermined address section of the double feed detection sensor, exceeds a predetermined third threshold, and the adjacent difference accumulated value of the output values ​​of the double feed detection sensor in a fifth address section, which is a predetermined address section of the double feed detection sensor, falls below a predetermined fifth threshold.

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