JP2012146225A - Paper sheet discrimination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain actualization of variation of detection sensitivity due to a security thread while suppressing conveyance jams.SOLUTION: Permanent magnets 212 are arranged with reverse magnetic poles meeting each other and, since the ties of magnetic fluxes are strong on the magnetic boundaries of adjoining permanent magnets 212 and therefore easily causing a drop in sensitivity, conveyance roller bodies are so arranged as for the loops of the rollers are positioned on the magnetic boundaries; magnetic resistance elements 214 are arranged in the central areas of the permanent magnets 212 where the detection sensitivity is higher so as for the high sensitivity areas of the elements 214 to be positioned in the central areas, and the conveyance roller bodies are arranged adjacent, with the high sensitivity areas of the magnetic resistance elements 214 placed in-between.

Description

  The present invention relates to a paper sheet identification device for identifying paper sheets such as banknotes and securities.

  This kind of paper sheet discriminating device is mounted on an automatic teller machine for depositing / withdrawing banknotes, for example, in order to identify the denomination, authenticity, and presence / absence of banknotes, and various identification methods have been proposed. Yes. As one of the methods, an identification method using the magnetic characteristics of banknotes is known (for example, Patent Document 1), which has an advantage of using the magnetic characteristics.

  In order to improve the effectiveness of avoiding counterfeit bills, security threads such as symbols and diagrams are often printed on bills with magnetic ink. And since this security thread is a magnetic ink printing part, it exhibits magnetic unique characteristics. Therefore, if a magnetic change is detected by a magnetic sensor while a bill is being conveyed, the identification accuracy based on such a magnetic change is detected. Will increase. On the other hand, various technologies for magnetic sensors have been proposed (for example, Patent Document 2). In these technologies, the performance can be improved by devising the arrangement of magnetoresistive elements as an example of a magnetic sensor. It has been.

JP 2006-221219 A JP 2003-107142 A Utility Model Registration No. 3105238

  By the way, in the conveyance of banknotes, for the purpose of suppressing the conveyance jam that hinders the conveyance, the entire banknote cannot be pressed against the sensor detection surface side over the entire area in the conveyance path width direction. Can only be intermittently performed in the width direction of the conveyance path. For this reason, it is difficult to make the interval between the bill and the sensor detection surface of the magnetic sensor (hereinafter referred to as the detection interval) constant in the conveyance path width direction.

  On the other hand, even if the performance is improved by devising the arrangement of the magnetic sensors, it is difficult to make the detection sensitivity constant in the conveyance path width direction. For example, when magnetic materials such as a plurality of permanent magnets are arranged along the conveyance path width direction in order to effectively form a magnetic flux, the magnetic material is conveyed at an adjacent location of the magnet and, for example, a central location of one magnet. Magnetic flux density is different regardless of banknotes. For this reason, the magnetic sensor that detects the magnetism at the location adjacent to the magnet and the magnetic sensor that detects the magnetism at the magnet central location have different magnetic flux densities as the detection reference and the same detection interval as described above. Therefore, there is a possibility that the detection sensitivity is lowered and the detection sensitivity is varied due to the banknote conveyance.

  In addition, the security thread as described above is often printed on the banknote, and the position and shape of the security thread in the banknote are uniform for each banknote type. However, since the banknote position during the banknote transport is not always uniform in the transport path width direction, the position in the transport path width direction through which the security thread passes changes each time the banknotes are transported, and the security thread has the above-described variation in detection sensitivity. A banknote is conveyed so that it may correspond to a generating location, or it is conveyed without matching. As a result, in the case where the detection sensitivity variation occurs and in the case where the detection sensitivity variation does not coincide with each other, the variation in the detection sensitivity becomes more obvious due to the magnetic characteristics of the security thread, so that the noise of the detection result increases. This situation is the same for paper sheets such as securities as well as banknotes.

  The present invention has been made to solve at least a part of the above-described conventional problems, and is intended to suppress the manifestation of variation in detection sensitivity due to the security thread after suppressing the conveyance jam. Objective.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the following configuration is adopted.

[Application 1: Paper identification device]
A paper sheet identification device that forms a magnetic flux in a conveyance path of a paper sheet to be identified, and identifies the paper sheet based on a change in magnetic flux accompanying the conveyance of the paper sheet,
A magnetic detection unit that is provided along a conveyance path width direction intersecting a conveyance direction of the paper sheet, and that detects the magnetic flux change while forming the magnetic flux;
A plurality of conveyance adjustment units acting on the paper sheets in the conveyance process so as to adjust the distance between the paper sheets passing through the magnetic detection unit and the magnetic detection unit;
At least one of the plurality of transport adjustment units is arranged along the transport path width direction in response to variations in detection sensitivity appearing along the transport path width direction in the magnetic detection unit. To do.

  The paper sheet identification device having the above-described configuration is configured to adjust the distance between the paper sheet and the magnetic detection unit in the transport process by the plurality of transport adjustment units. It is arranged along the conveyance path width direction that intersects with. Therefore, the paper sheet spacing adjustment location by the transport adjustment unit becomes intermittent in the transport path width direction, and transport jams during transport of paper sheets can be suppressed. Thus, when arranging the plurality of conveyance adjusting units along the conveyance path width direction, the arrangement position corresponds to the variation in detection sensitivity that appears along the conveyance path width direction in the magnetic detection unit. And the conveyance adjustment part which takes such an arrangement position acts on the paper sheets for the adjustment of the distance so that the distance adjustment between the paper sheets and the magnetic detection part is performed on the side to suppress the variation in the detection sensitivity, and is adjacent. It is possible to prevent such a gap adjustment between the conveyance adjustment units. For this reason, even if the security thread of the banknote, which is one of the paper sheets, is located at a position where the variation in the detection sensitivity of the magnetic detection unit is manifested by the magnetic characteristics of the security thread, the banknote part of the security thread By adjusting the distance from the magnetic detection part to the variation suppressing side, it is possible to prevent the influence of the magnetic characteristics of the security sled from changing significantly. Further, since such a distance adjustment is not performed between adjacent conveyance adjustment units, the bill portion of the security sled can be moved away from the magnetic detection unit, and the influence of the magnetic characteristics of the security sled can be weakened. As a result, according to the paper sheet identification apparatus having the above-described configuration, it is possible to suppress the manifestation of variation in detection sensitivity of the magnetic detection unit by the security thread, while suppressing the conveyance jam during the conveyance of the paper sheet.

  The paper sheet identification apparatus having the above-described configuration can be configured as follows. For example, the conveyance adjustment unit can be arranged to face the magnetic detection unit in a low-sensitivity region where the detection sensitivity of the magnetic detection unit is lower than other regions. In this way, the security sled of the paper sheet is not moved away from the magnetic detection unit in the low-sensitivity part, and the distance from the magnetic detection part can be adjusted to the variation suppressing side. Sensitivity degradation can be suppressed by increasing the magnetic characteristics.

  In this case, the conveyance adjusting units adjacent to each other in the high-sensitivity portion where the detection sensitivity of the magnetic detection unit is higher than that of other portions are arranged with a space therebetween, and are adjacent to each other with the high-sensitivity portion interposed therebetween. it can. In this way, the security sled of the paper sheet can be moved away from the magnetic detection unit in the high-sensitivity part, so that the influence of the magnetic property of the security sled on the magnetic flux change is weakened and the magnetic flux change in the high-sensitive part is reduced. , Excessive sensitivity can be suppressed.

  Thus, when arranging the conveyance adjustment unit corresponding to the high and low sensitivity parts, the magnetic detection unit is configured such that a plurality of magnetic bodies forming the magnetic flux are arranged in the direction of the magnetic pole for each adjacent magnetic body. It is arranged adjacent to each other along the width direction of the conveyance path, and a plurality of magnetic sensors having a magnetic effect as a sensor detection principle are provided to be opposed to each of the magnetic bodies, and for the plurality of conveyance adjustment units, With the boundary of the adjacent magnetic bodies as the low-sensitivity part, the transport adjustment unit including the boundary is opposed to the magnetic body, and the adjacent transport adjustment units are separated from the magnetic body by an interval between the transport adjustment units. It can be arranged side by side to face each other.

  If a plurality of magnetic bodies are arranged adjacent to each other along the transport path width direction by changing the direction of the magnetic pole for each adjacent magnetic body, magnetic flux can be efficiently formed. The magnetic flux between them is strong and the magnetic flux change is difficult to occur, so that the detection sensitivity of the magnetic sensor having the magnetic effect as a sensor detection principle is likely to be lowered. On the other hand, in the case of a magnetic body, when the magnetic material is separated from the boundary with the adjacent magnetic body, the connection of the magnetic flux becomes weak, so that the magnetic flux easily changes and the detection sensitivity of the magnetic sensor tends to be excessive. That is, when the magnetic material arrangement described above is taken from the viewpoint of magnetic flux formation, the detection sensitivity of the magnetic sensor varies from the top to the bottom. However, at the boundary of the magnetic material where the detection sensitivity is likely to decrease, the conveyance adjustment unit faces the magnetic material including that boundary, so the change in magnetic flux due to the security sled can be increased by keeping the security sled away from the magnetic sensor. As a result, a decrease in sensitivity can be suppressed. On the other hand, although the detection sensitivity tends to be excessive at the part of the magnetic material that is far from the boundary with the adjacent magnetic material, the security sled is moved away from the magnetic sled to reduce the effect of the magnetic property on the magnetic flux change. It is possible to reduce the change in magnetic flux at the sensitivity part and to suppress excessive sensitivity.

  And about a conveyance adjustment part, each can be made into the conveyance roller which carries out drive rotation so that conveyance of the said paper sheets along the said conveyance direction may be brought about, and carrying out the paper sheets by a conveyance roller in this way In addition, it is possible to achieve both suppression of conveyance jam and suppression of manifestation of variation in detection sensitivity due to security sled.

  In addition to such a transport roller, the transport adjustment unit is engaged with the opposing member facing the magnetic detection unit across the paper sheet transported along the transport direction, and the magnetic detection unit engaged with the opposing member. An elastic holding member that causes the movement of the facing member toward the head, or the adjacent opposing members can be engaged with the common elastic holding member. Even in this case, it is possible to achieve both suppression of the conveyance jam and suppression of manifestation of variation in detection sensitivity due to the security thread. If the magnetic detection unit is located on the lower side in the vertical direction and the conveyance adjustment unit is located on the upper side in the vertical direction, the opposing member is suspended and held by the elastic holding member, so that the opposing member is moved by its own weight. The paper sheet is pressed against the magnetic detection unit so that the distance from the magnetic detection unit is within the specified range. If this is the opposite, the elastic holding member applies the elastic force to the opposing member, thereby pressing the paper sheet against the magnetic detection unit so that the distance from the magnetic detection unit is within the specified range.

  In addition, the plurality of conveyance adjustment units have a wide and narrow difference in the width along the conveyance path width direction, and the wide conveyance adjustment unit has a detection sensitivity of the magnetic detection unit as compared with other parts. It can arrange | position so that it may face the said magnetic detection part in a low low sensitivity site | part. In this way, it is simple and reliable that the security thread is kept away from the magnetoresistive element in the low sensitivity portion.

It is a perspective view which shows the external appearance of the automatic teller machine 100 which mounts the banknote handling apparatus 101 concerning a present Example. 1 is a side sectional view showing a schematic configuration of a bill handling apparatus 101. FIG. It is explanatory drawing explaining the upper unit 101a. It is a block diagram which shows the control unit 80 of the banknote handling apparatus 101. FIG. It is explanatory drawing which shows the banknote S conveyed in the conveyance path 40P for discrimination in the banknote identification part 40, and the detection part opposing conveyance roller 202 which is concerned in the conveyance in the side view roughly. It is explanatory drawing which shows schematically the relationship between the magnetic detection part 210 and the detection part opposing conveyance roller 202 seeing from the conveyance direction upstream of the banknote S. FIG. It is explanatory drawing which shows schematically the mode of the magnetic field which the structure of the magnetic detection part 210 and the detection part itself generate | occur | produce. It is explanatory drawing explaining the mode of the output from the magnetoresistive element 214. FIG. It is explanatory drawing which shows roughly an example of the characteristic of the magnetoresistive element 214, and a magnetic circuit pattern which brings about this characteristic. It is explanatory drawing which shows the mode of conveyance of the banknote S to the magnetism detection part 210 as a bird's-eye view from the conveyance path upper direction. It is explanatory drawing explaining the influence of the security thread | sled SS on the sensor output at the time of arrange | positioning the magnetoresistive element 214h of a comparative example like the magnetoresistive element 214 of a present Example. It is explanatory drawing which shows the mode of the sensor output at the time of arrange | positioning conveyance roller body 202_1-202_2 in the boundary of the adjacent permanent magnet 212, and making the center area | region of the permanent magnet 212 between adjacent conveyance roller bodies. It is explanatory drawing which shows the mode of a sensor output at the time of arrange | positioning the magnetoresistive element 214 of a present Example which is equivalent to FIG. It is explanatory drawing which shows the mode of arrangement | positioning of the magnetoresistive element 214 which gave the high and low characteristic to the detection sensitivity, and the mode of arrangement | positioning with each conveyance roller body of the detection part opposing conveyance roller 202. It is explanatory drawing which shows the mode of arrangement | positioning of each opposing roller body 302 of the detection part opposing roller 300 of the 1st modification instead of the detection part opposing conveyance roller 202 equivalent to FIG. It is explanatory drawing which shows the mode of arrangement | positioning of each opposing body 352 of the detection part opposing body 350 replaced with the detection part opposing conveyance roller 202. FIG. It is explanatory drawing which shows the structure of the magnetoresistive element 214 in another modification. FIG. 15 is an explanatory diagram showing a state of arrangement when the magnetoresistive element 214 of this modification is used, corresponding to FIG. 14.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an appearance of an automatic teller machine 100 equipped with a bill handling apparatus according to the present embodiment. The automatic cash transaction apparatus 100 is an apparatus that is managed by a financial institution such as a bank and performs various transactions according to the operation of a user (customer). The automatic teller machine 100 includes a bill handling device 101, a coin handling device 102, a passbook handling device 103, a card statement handling device 104, and a customer operation unit 105. Moreover, although illustration is abbreviate | omitted, the automatic teller machine 100 is provided with the main body control unit for controlling the power supply unit and the automatic teller machine 100 whole.

  The banknote handling apparatus 101 is an apparatus for sending and receiving banknotes with a user. The coin handling device 102 exchanges coins with users. The bankbook handling device 103 handles the bankbook and performs reading of marks and the like printed on the bankbook and printing processing according to transactions. The card statement handling apparatus 104 reads information recorded on a magnetic stripe card (so-called cash card), or issues a transaction statement slip in which the contents are recorded according to the transaction. The customer operation unit 105 is an interface with a user for displaying information for deposit / withdrawal transactions and inputting operations for deposit / withdrawal transactions.

  FIG. 2 is a side sectional view showing a schematic configuration of the bill handling apparatus 101. The banknote handling apparatus 101 includes an upper unit 101a arranged at the upper part, a safe unit 101b arranged at the lower part, and a control unit 80 for controlling both units, and the banknote transport path is limited to a limited interior. Arranged in a space, the safe unit 101b can be used for multiple purposes. Hereinafter, the structure of each part of the banknote handling apparatus 101 will be described.

  FIG. 3 is an explanatory diagram for explaining the upper unit 101a. The upper unit 101a generally includes a mechanism necessary for sending and receiving banknotes with a user, and includes a banknote deposit / withdrawal unit 30, a banknote identification unit 40 (paper sheet discrimination unit), a temporary storage 50, and a storage unit. It includes a forgotten banknote storage 60 and a transport mechanism for transporting banknotes between the sections.

  The banknote depositing / withdrawing unit 30 includes a depositing unit 30a in which a user deposits banknotes, and a dispensing unit 30b (stacking unit) in which banknotes are dispensed, and these are partitioned by a partition plate 31 and a withdrawal unit. A pressing plate 32 is provided for moving banknotes accumulated in 30b to the depositing unit 30a side. The banknote identification part 40 is a mechanism which discriminate | determines whether it is a money type of a banknote, authenticity, and a rejection banknote, and outputs the discrimination result to the control unit 80 (FIG. 2), for example, scans a banknote. The image data obtained in this way, the unevenness of the surface of the banknote, the magnetic characteristics, and the optical characteristics for ultraviolet rays can be used for various information. Among these, the matter regarding the detection of magnetic characteristics is related to the gist of the present invention and will be described later. Rejected banknotes are banknotes that are incompatible due to the authenticity of the banknotes, or banknotes whose authenticity is unknown due to overlapping or folding. The temporary storage 50 is a mechanism for temporarily storing banknotes in the process of transporting banknotes between the banknote deposit / withdrawal unit 30 and the safe unit 101b. The forgotten banknote storage 60 is a mechanism for accumulating banknotes forgotten by the user.

  The transport mechanism includes a deposit transport path 30Pa for collecting banknotes from the deposit section 30a of the banknote deposit / withdrawal section 30, a withdrawal transport path 30Pb for feeding banknotes to the withdrawal section 30b, a differential transport path 40P, and temporary storage. A transport path 50Pa for rejection and a transport path 60P for rejection are provided. The conveyance paths such as the identification conveyance path 40P and the temporary storage conveyance path 50Pa are configured to be bidirectionally conveyable, and the identification conveyance path 40P is related to the gist of the present invention. It will be described later. Gates 31G, 32G, 50G, and the like are arranged at branch points of the transport path, and are configured to switch the banknote transport direction in the transport path described above. Further, the bill handling apparatus 101 is provided with a sensor for detecting a bill. In other words, the passage sensor 40S is disposed in the banknote recognition unit 40, and the empty detection sensor 50Sa and the full detection sensor 50Sb are disposed in the temporary storage 50. The detection signals of these sensors are sent to the control unit 80, and are used for the passage of banknotes and the determination of the presence or absence of banknotes.

  In FIG. 2, a safe unit 101b includes a bill storage 70 (paper sheet storage), a transport mechanism, a sensor, and a gate, and is a mechanism that transports bills to and from the upper unit 101a in both directions. The banknote storage 70 includes four cassettes 71 to 74 for banknotes, which have almost the same configuration and different types of banknotes to be handled. For example, 10,000 yen, 5,000 yen, 1,000 yen, 2,000 It is used as a banknote storage for storing yen. The four bill cassettes 71 to 74 have the same configuration. In addition, since it is not directly related to the summary of this invention about the conveyance path 70P for storage between these cassettes for banknotes and the banknote between cassettes, this is abbreviate | omitted about the description.

  FIG. 4 is a block diagram showing the control unit 80 of the bill handling apparatus 101. The control unit 80 is configured with the main control unit 81 as the center, and passes commands from a host device HC such as a host computer of an automatic transaction apparatus installed in a financial institution via the line control unit 90, and the above-described sensor. Each unit is controlled based on the signal from

  The main control unit 81 is configured with the central control unit 82 as a center, and includes a storage unit 83 that stores programs and various types of information, and control units that are controlled by the central control unit 82. As each control unit, a deposit / withdrawal control unit 84 that controls separation and accumulation of banknotes with respect to the banknote deposit / withdrawal unit 30, an identification control unit 85 that outputs a banknote identification result of the banknote recognition unit 40, and a temporary storage unit A temporary holding unit control unit 86 that controls separation and stacking of banknotes with respect to the control unit 86 and a storage control unit 87 that controls separation and stacking of banknotes with respect to the banknote storage 70 are provided. Among these, the identification control unit 85 includes a data processing unit 85a and a true / false identification unit 85b, and inputs sensor outputs from the magnetoresistive element 214 in the optical sensor 154 and the magnetic detection unit 210, which will be described later, included in the bill identification unit 40. To do. The data processing unit 85a adjusts these sensor inputs and performs various conversions, and the authenticity identification unit 85b identifies the authenticity and denomination of the banknote based on the data from the data processing unit 85a.

  The control unit 80 includes a drive unit and a sensor driven by the main control unit 81. The drive unit includes a sensor drive unit 91 that controls sensors such as a passage sensor that detects passage of banknotes and a fullness detection sensor, a gate drive unit 92 that switches gates so as to transport banknotes to a predetermined stacking destination, and a conveyance path A conveyance path motor drive unit 93 that controls the drive motor, a conveyance path movement amount counting unit 94 that counts the movement amount of the conveyance path, and a bill conveyance monitoring unit 95 that detects conveyance abnormality are provided. The banknote conveyance monitoring unit 95 is based on the identification result from the identification control unit 85 and the banknote on the conveyance path from the feeding to the accumulation based on the information on the accumulation destination determined by the main control unit 81 and the sensor information from the sensor driving unit 91. Has a function of monitoring that the paper is being conveyed correctly. The main control unit 81 executes various banknote handling processes such as a withdrawal process and a deposit process by controlling each drive unit based on the signal from the sensor described above.

  Next, the banknote identification part 40 is explained in full detail. FIG. 5 is an explanatory diagram schematically showing a side view of the banknote S transported in the transport path 40P for discrimination in the banknote recognition section 40 and the detecting section opposing transport roller 202 involved in the transport, and FIG. 6 shows magnetic detection. It is explanatory drawing which shows schematically the relationship between the part 210 and the detection part opposing conveyance roller 202 seeing from the conveyance direction upstream of the banknote S. FIG.

  As shown in the figure, the discrimination conveyance path 40P is a conveyance path that passes through the magnetic identification unit 200, and the guide plates 142 that are positioned above and below the conveyance path prevent the conveyance locus of the banknote S from being greatly displaced vertically. . An upstream conveyance roller pair 150 and a downstream roller pair 152 are positioned upstream and downstream of the magnetic identification unit 200 in the identification conveyance path 40P, and are detected facing the magnetic detection unit 210 of the magnetic identification unit 200. The part opposing transport roller 202 is located. The upstream transport roller pair 150 and the downstream roller pair 152 are transported and rotated so that one roller brings the banknote S along the transport path for discrimination 40P, and the other roller is rotated by following it. The banknote S is conveyed along the conveyance path 40P for discrimination. The detection unit opposing conveyance roller 202 is conveyed and rotated so as to convey the banknote S along the identification conveyance path 40 </ b> P, and is involved in the banknote conveyance, and biases the conveyed banknote S toward the magnetic detection unit 210. To do.

  As shown in FIG. 6, the detection unit facing transport roller 202 is configured as a set of cylindrical transport roller bodies 202_1 to 202_i that are mounted on a common rotating shaft 204 with a space therebetween. Each conveyance roller body is arrange | positioned along the conveyance path width direction which cross | intersects the conveyance direction of the banknote S in the conveyance path 40P for discrimination, and each conveys rotation as mentioned above. That is, the transport roller bodies 202_1 to 202_i of the detection unit facing transport roller 202 act on the banknote S passing through the magnetic detection unit 210, and the separation between the banknote S and the magnetic detection unit 210 in the transport process is within a specified range. Adjust to fit. In this case, the interval between the adjacent conveyance roller bodies in the arrangement of the conveyance roller bodies 202_1 to 202_i, that is, the state of the arrangement of the respective conveyance roller bodies, is determined according to variations in detection sensitivity described later. Further, the number of the transport roller bodies 202_1 to 202_i is determined according to the size of the transport path width of the discrimination transport path 40P after adopting the transport roller body arrangement as described later.

  Even in each roller of the upstream conveyance roller pair 150 and the downstream roller pair 152, similarly to the detection unit facing conveyance roller 202, it is configured as a collection of cylindrical roller bodies, and each roller body is arranged along the conveyance path width direction. Arrange. In this case, in the above-described two roller pairs, a plurality of cylindrical roller bodies can be arranged at the same pitch as the detection unit facing conveyance roller 202, but the roller pair is not opposed to the magnetic detection unit 210. Unlike the part-conveying roller 202, they can be arranged at a predetermined pitch. The upper and lower guide plates 142 are disposed so as not to interfere with each of the roller bodies described above, and are formed of a nonmagnetic material that does not affect the magnetic flux of the magnetic detection unit 210.

  In addition, as shown in FIG. 5, an optical sensor 154 is disposed above the identification conveyance path 40 </ b> P on the upstream side of the upstream conveyance roller pair 150. The guide plate 142 on the side of the optical sensor 154 serves as a detection window in which a translucent material such as glass is incorporated at a portion facing the sensor. The optical sensor 154 is arranged in a line over the conveyance path width direction of the identification conveyance path 40P, and scans the pattern of the banknote S being conveyed through the detection window described above, and acquires image data of the banknote S. . This image data is sent as detection data to a data processing unit 85a (see FIG. 4), and is used for authenticating a banknote in the authenticity identifying unit 85b together with a magnetic detection result by the magnetic detecting unit 210.

  Next, the magnetic detection unit 210 will be described. FIG. 7 is an explanatory diagram schematically showing the configuration of the magnetic detection unit 210 and the state of the magnetic field generated by the detection unit itself. As shown in the drawing, the magnetic detection unit 210 includes a permanent magnet 212 and a magnetoresistive element 214 arranged to face each other. The permanent magnet 212 is disposed adjacently along the conveyance path width direction of the identification conveyance path 40P by changing the direction of the magnetic pole for each adjacent permanent magnet. For this reason, the magnetic detection part 210 forms the loop-shaped magnetic flux M with the permanent magnet 212 as shown with the dotted line in a figure. This magnetic flux M is formed on the basis of the magnetic force of the permanent magnet 212, and its connection is strong across the boundary between adjacent permanent magnets 212, and the connection of the magnetic flux M weakens toward the center of the permanent magnet 212 and rises. In FIG. 7, the direction from the rear side to the front side of the paper or vice versa is the conveyance direction of the bills S, so that the magnetic flux M penetrates the bills S to be conveyed.

  The magnetoresistive element 214 detects a change in magnetic flux formed by the permanent magnet 212. That is, the magnetoresistive element 214 has a pair of magnetic circuit patterns on the surface thereof, and the circuit pattern is opposed to the magnetic pole surface of the permanent magnet 212. Therefore, a magnetic flux that penetrates the magnetic circuit pattern vertically (specifically, the magnetic flux density). ) Changes, the resistance value of the magnetic circuit pattern changes and the flowing current changes. Since the change in current corresponds to the change in magnetic flux, the magnetoresistive element 214 generates an output corresponding to the change in magnetic flux. FIG. 8 is an explanatory diagram for explaining the state of output from the magnetoresistive element 214. As shown in the figure, the magnetoresistive element 214 receives application of a predetermined voltage from the power source 216 to a pair of magnetic circuit patterns, and outputs a potential between the patterns to the comparator 222. The voltage of the power source 216 is also applied to the resistors 218 and 220 included in the resistor circuit parallel to the magnetoresistive element 214, and the potential (constant potential) between both resistors is also output to the comparator 222. The result is output to the amplifier 224, and the output is converted by the AD converter 226 to become the output of the magnetoresistive element 214. If there is no change in the magnetic flux M vertically penetrating the magnetoresistive element 214, the output of the magnetoresistive element 214 from the AD converter 226 is constant. However, if the magnetic flux vertically penetrating the magnetoresistive element 214 changes, the output from the magnetoresistive element 214 to the comparator 222 changes according to the change in the magnetic flux, and this change in output causes the magnetoresistive from the AD converter 226 to change. The output of the element 214 will change, and this output will reflect the change in magnetic flux.

  FIG. 9 is an explanatory diagram schematically showing an example of the characteristic of the magnetoresistive element 214 and an example of a magnetic circuit pattern that brings about this characteristic. As shown in FIG. 9, the magnetoresistive element 214 has high sensitivity in the central region and low sensitivity on both sides. Such high and low sensitivity characteristics can be obtained by forming the paired magnetic circuit pattern MP so that the pattern is sparse in the low sensitivity region and the pattern is dense in the high sensitivity region. A plurality of the magnetoresistive elements 214 are prepared for each permanent magnet 212. In this embodiment, the three magnetoresistive elements 214 correspond to the magnetic pole surfaces of one permanent magnet 212, and the adjacent permanent magnets 212 are adjacent to each other. Is bordered by the magnetoresistive element 214, and a central region with high detection sensitivity of the magnetic flux change is located at this boundary.

  Here, how the magnetic detection unit 210 detects magnetic characteristics will be described. FIG. 10 is an explanatory diagram showing the state of transport of the banknote S to the magnetic detection unit 210 as seen from above the transport path. As shown in the drawing, the banknote S is transported toward the magnetic detection unit 210, but the transport position of the banknote S with respect to the magnetic detection unit 210 is not uniform. This is because the size of the banknote S is different for each denomination and how the user inserts the banknote S into the banknote insertion hole of the banknote handling apparatus 101 is not determined. And since the security thread SS formed with the magnetic ink on the banknote S is formed at a different position for each denomination or the transport position of the banknote S is not uniform, the security thread SS is also positioned relative to the magnetic detection unit 210. Are rarely uniform. For example, since the user rarely inserts the banknote S into the banknote insertion hole in consideration of the front, back, left and right, the security thread SS can take a symmetrical position in the position shown in FIG. Depending on the loading position, the position shown in FIG. In addition, although the banknote conveyance path position can be defined to some extent by defining one end of the banknote S, the conveyance path position of the banknote S or the security thread SS is not always a fixed position.

  Next, the state of the sensor output when the magnetoresistive element 214 is given sensitivity characteristics as shown in FIG. 9 will be described. For comparison, the magnetoresistive element 214h of the comparative example that does not give high and low sensitivity characteristics. The sensor output when using is described first. FIG. 11 is an explanatory diagram for explaining the influence of the security thread SS on the sensor output when the magnetoresistive element 214h of the comparative example is arranged like the magnetoresistive element 214 of the present embodiment. For example, when the banknote S is conveyed as shown in FIG. 10, as shown in FIG. 11, the security thread SS can take various pass positions in the left side range in the figure. In FIG. 11, the direction of the banknote S is the direction from the back side of the paper to the front side or vice versa. Moreover, since the banknote S is conveyed while being urged by the conveyance roller body 202_1 of the detection unit opposite conveyance roller 202 shown in FIG. 6, the gap is adjusted so as to be close to the regulation in the vicinity of the magnetoresistive element 214h. Is done. The surface of the magnetoresistive element 214h is covered with a cover (not shown) in order to avoid element damage associated with bill conveyance. Since this cover is made of a non-magnetic material, it does not affect the magnetic flux of the magnetic detection unit 210. The same applies to a magnetoresistive element 214 described later.

  On the other hand, between the adjacent transport roller bodies 202_1 and the like, the banknote S is not biased by the transport roller body, and thus may be bent and separated from the magnetoresistive element 214h. For this reason, as shown in FIG. 11, the vertical position of the security thread SS with respect to the magnetoresistive element 214h differs depending on the path position, and the security thread SS moves away from the magnetic detection unit 210 between adjacent transport roller bodies 202_1 and the like. Such a situation is the same when the magnetoresistive element 214 of this embodiment described later is used.

  Since the security thread SS is formed of magnetic ink, the security thread SS affects the magnetic flux M formed by the permanent magnet 212, and the closer to the permanent magnet 212, that is, when the path position is closer to the magnetoresistive element 214h. However, the magnetic flux M is changed more greatly than when the path position away from the magnetoresistive element 214h is taken. This state is shown in the sensor output voltage in FIG. 11, where the dotted line output reflects the influence of the security thread SS at the path position away from the magnetoresistive element 214h, and the solid line output approaches the magnetoresistive element 214h. This reflects the influence of the security thread SS at the pass position. Since the output waveform portion Pa shown in the figure is in the vicinity of the central region of the permanent magnet 212, as described with reference to FIG. 7, the connection of the magnetic flux M weakens and the magnetic flux M rises, and the magnetoresistive element facing the portion At 214h, since there is no difference in sensitivity, the sensor output from the magnetoresistive element 214h shows little variation in sensitivity, and as described above, the output by the security thread SS becomes high and low. In this case, since the magnetic flux M rises most at the center of the permanent magnet 212, it is easily affected by the security thread SS and the detection sensitivity is increased.

  On the other hand, in the output waveform portion Pb, since the portion is a magnet boundary between adjacent permanent magnets 212, the magnetic flux M is strongly connected as described with reference to FIG. Even if they are close to each other, the magnetic flux M cannot be greatly changed. Moreover, since the magnetoresistive element 214h does not have high or low sensitivity, as shown in FIG. 11, the detection sensitivity based on the change of the magnetic flux M greatly varies at the output waveform portion Pb corresponding to the magnet boundary, and the sensitivity Also decreases.

  Next, the sensor output by the magnetoresistive element 214h described above will be described in consideration of the relationship with the banknote biasing by the transport roller body 202_1 of the detection unit facing transport roller 202 and the like. FIG. 12 is an explanatory diagram showing the sensor output when the transport roller bodies 202_1 to 202_2 are arranged at the boundary between the adjacent permanent magnets 212 and the central region of the permanent magnet 212 is between the adjacent transport roller bodies. In FIG. 12, the direction from the back side to the near side of the paper surface or the reverse is the conveyance direction of the bills S, and the horizontal direction on the paper surface is the conveyance path width direction. The same applies to a diagram equivalent to FIG.

  In the arrangement of the conveying roller bodies as shown in FIG. 12, the conveying roller bodies 202_1 to 202_2 face each other at the boundary (magnet boundary) between the adjacent permanent magnets 212, and these conveying roller bodies use the antinodes of the rollers as magnet boundaries. To be located. Since the banknotes S are transported under the energization of these transport roller bodies, the security sled SS is adjusted to be close to the magnetoresistive element 214h and within a specified range within the range where the banknotes hit the belly of the transport roller bodies. The However, each of the magnetoresistive elements 214h arranged as shown in FIG. 12 does not have a difference in detection sensitivity between the elements, so the magnetoresistive element 214h that opposes the magnet boundary although the above-mentioned distance is within the specified range. The sensor output (output waveform portion Pb) from is a low-sensitivity portion where the variation in detection sensitivity is larger than that of the adjacent magnetoresistive element 214h, and the sensitivity is significantly reduced.

  Further, between the adjacent transport roller bodies 202_1 to 202_2, there is a case where the banknotes S are bent and are bent and separated from the magnetoresistive element 214h because they are not urged by the transport roller bodies. The magnetoresistive element 214h positioned between the transport roller bodies has no difference in detection sensitivity as described above, and the security thread SS is moved from the magnetoresistive element 214h as the banknote S is curved. Move away. Therefore, the sensor output of the magnetoresistive element 214h in the output waveform portion Pc between the transport roller bodies is a sensor when the security thread SS is close to the magnetoresistive element 214h and the distance is within the specified range. Compared with the output (solid line output in the figure), as shown by the dotted line in the figure, there is a large variation in detection sensitivity and a significant decrease in sensitivity. Although the sensitivity variation and the sensitivity decrease at the output waveform portion Pc are improved by, for example, making the two transport roller bodies 202_1 to 202_2 shown in the figure one continuous roller body, the bill S May contact the belly of the roller over a wide range, which may cause a paper jam to be conveyed. Therefore, the sensor output in the area (output waveform portion Pc) between the transport roller bodies obtained in actual banknote transport is from the magnetoresistive element 214h when the banknote S is curved. The sensor output indicated by the dotted line in the figure affected by the security thread SS that has moved away.

  In order to cope with such a situation, the automatic teller machine 100 according to the present embodiment, more specifically, the banknote recognition unit 40 mounted on the automatic transaction device 100 according to the present embodiment has a magnetic sensitivity according to the present embodiment having high and low detection sensitivity as described with reference to FIG. A resistance element 214 was used. First, the variation in sensor detection sensitivity at the magnet boundary between adjacent permanent magnets 212 and improvement of the decrease will be described. FIG. 13 corresponds to FIG. 12, and is an explanatory view showing the state of sensor output when the magnetoresistive element 214 of this embodiment having a high and low detection sensitivity characteristic is arranged.

  As shown in the figure, a magnetoresistive element 214 having high sensitivity in the central region as shown in FIG. 9 is arranged at the magnet boundary between adjacent permanent magnets 212. Facing the border. Then, the transport roller bodies 202_1 to 202_2 faced each other with respect to the magnet boundary, and the antinodes of the rollers of the transport roller bodies were positioned at the magnet boundary. Therefore, as already described, in the range corresponding to the antinode of the transport roller body (output waveform portion Pb), the security thread SS is close to the magnetoresistive element 214h and the distance is within the regulation, and at the portion facing the magnet boundary, Since the magnetoresistive element 214 is highly sensitive, the sensor output at the output waveform portion Pb improves in terms of variation in detection sensitivity and sensitivity reduction, as indicated by the white arrow in the figure.

  In the banknote recognition part 40 of a present Example, in addition to the arrangement | positioning of the high sensitivity area | region of the magnetoresistive element 214 in the above-mentioned magnet boundary, and arrangement | positioning facing conveyance roller bodies 202_1-202_2, between adjacent conveyance roller bodies, It was as follows. FIG. 14 is an explanatory diagram showing the arrangement of the magnetoresistive element 214 with high and low detection sensitivity and the arrangement of the conveyance roller bodies of the detection unit facing conveyance roller 202. As shown in the drawing, in the banknote recognition unit 40 of the present embodiment, the high sensitivity region of the magnetoresistive element 214 faces the magnet boundary of the adjacent permanent magnet 212, and the transport roller body 202_2 and the like face the magnet boundary. In addition to the alignment, the high sensitivity region of the magnetoresistive element 214 is positioned between the adjacent transport roller bodies. That is, the transport roller body is arranged so that the high sensitivity region of the magnetoresistive element 214 facing the permanent magnet 212 without facing the magnet boundary is sandwiched between the adjacent transport roller bodies. With this arrangement, the conveyance roller body 202_1 and the conveyance roller body 202_2 are arranged adjacent to each other with the high sensitivity region of the magnetoresistive element 214 interposed therebetween, and this arrangement relationship is such that the adjacent conveyance roller body 202_2 and the conveyance roller body 202_3, The same applies to the transport roller body 202_3 and the transport roller body 202_4, the transport roller body 202_4 and the transport roller body 202_5, the transport roller body 202_5 and the transport roller body 202_6, and the transport roller body 202_6 and the transport roller body 202_7. In addition, with respect to the transport roller body 202_3 and the transport roller body 202_5 facing the magnet boundary of the adjacent permanent magnet 212, these are used as roller bodies that are long in the transport path width direction, and the magnet boundary of the permanent magnet 212 serving as a low sensitivity portion. To face each other.

  As described above, since the roller body arrangement is adopted so that the high sensitivity area of the magnetoresistive element 214 is sandwiched between the adjacent transport roller bodies, the area of the permanent magnet 212 other than the boundary of the adjacent permanent magnet 212 (output waveform part Pa) The sensor output at is as follows. The adjacent conveyance roller body 202_1 and the conveyance roller body 202_2 will be described as an example. Since the magnetoresistive element 214 is positioned in the high sensitivity region between the two roller bodies, The sensor detection sensitivity at is high. Therefore, if the security thread SS is close to the magnetoresistive element 214, the sensor output greatly increases as shown by the solid line in the figure.

  On the other hand, in the present embodiment, the banknote S is adjusted with respect to the banknote S by adjusting the distance from the magnetic detection unit 210 as described above on the rollers of the transport roller body 202_1 and the transport roller body 202_2. 214, the adjustment is released between the two roller bodies. Therefore, as shown in the figure, the bill S is curved between the two roller bodies, and the security thread SS moves away from the magnetoresistive element 214 along with this. Then, although the sensitivity is increased by arranging the high sensitivity region of the magnetoresistive element 214, the security thread SS is moved away from the magnetoresistive element 214 in the highly sensitive part (output waveform part Pb). The detection sensitivity is suppressed as indicated by the black arrows in the figure. Even if such sensitivity suppression is attempted, the sensitivity after suppression can be as high as the detection sensitivity in the low sensitivity region adjacent to the high sensitivity region of the magnetoresistive element 214.

  As described above, in the automatic teller machine 100 according to the present embodiment, when the banknote identification unit 40 mounted thereon performs magnetic detection of the banknote S, a plurality of permanent magnets 212 that form a magnetic flux are arranged for each adjacent magnet. A plurality of magnetoresistive elements 214 are arranged opposite to each other for each permanent magnet 212 by changing the direction of the magnetic poles to be adjacent along the conveyance path width direction of the identification conveyance path 40P. In this opposing arrangement, the high sensitivity region of the magnetoresistive element 214 was faced to the magnet boundary between the adjacent permanent magnets 212. Moreover, about the some conveyance roller body 202_1-202_7 which comprises the detection part opposing conveyance roller 202, the one boundary of the permanent magnet 212 of the conveyance roller body (conveyance roller body 202_3 and conveyance roller body 202_5) is adjoined. Including the adjacent transport roller bodies, for example, the transport roller bodies 202_1 to 202_2 as shown in FIG. 14, and the distance between the transport roller bodies is the permanent magnet 212 and the magnetoresistive element 214 facing the permanent magnet 212. They were placed side by side to face the high sensitivity range.

  According to the automatic teller machine 100 of a present Example, a magnetic flux can be efficiently formed by changing the direction of a magnetic pole for every adjacent magnet, and arrange | positioning adjacently along a conveyance path width direction. . Thus, at the magnet boundary between adjacent permanent magnets 212, magnetic flux changes are less likely to occur due to the strong coupling of magnetic flux, as described above, and the detection sensitivity of the magnetoresistive element 214 tends to decrease. In this way, at the magnet boundary where the sensitivity is likely to decrease, the transport roller body 202_3 and the transport roller body 202_5 face the permanent magnet 212 including the magnet boundary, so that the bill S and the security thread SS are close to the magnetoresistive element 214. As a result, the security thread SS is kept away from the magnetoresistive element 214. For this reason, coupled with the fact that the high sensitivity region of the magnetoresistive element 214 is positioned at the magnet boundary, it is possible to suppress a decrease in sensitivity at the magnet boundary (see FIG. 13) and not to cause a variation in detection sensitivity due to the security thread SS. .

  On the other hand, in the part of the permanent magnet 212 far from the magnet boundary with the adjacent permanent magnet 212, the coupling of the magnetic flux is weakened, and the magnetic flux change is liable to occur, and the detection sensitivity of the magnetoresistive element 214 tends to be excessive. That is, if the above-described permanent magnet 212 is arranged from the top of the magnetic flux formation, the detection sensitivity varies from the top of the configuration. In addition, in the present embodiment, in the low-sensitivity portion of the magnet boundary described above, the sensitivity reduction is suppressed and the detection sensitivity by the security thread SS is determined by the arrangement of the transport roller body and the high-sensitivity area of the magnetoresistive element 214. In the part of the permanent magnet 212 corresponding to the high detection sensitivity part, the sensitivity is increased by the arrangement of the high sensitivity region of the magnetoresistive element 214 and the security thread SS of the adjacent transport roller body is arranged. Excessive sensitivity can be suppressed by diluting the influence on the magnetic flux change (see FIG. 14).

  Further, in this embodiment, since each of the transport roller bodies 202_1 to 202_7 constituting the detection unit facing transport roller 202 is driven to rotate so as to transport the banknote S, the banknote by the detection unit facing transport roller 202 is rotated. While trying to convey S, it is possible to suppress both conveyance jam and suppression of manifestation of variation in detection sensitivity due to security thread SS. Since it is frequently used to configure the detection unit opposite conveying roller 202 with a plurality of conveying roller bodies 202_1 to 202_7, a simple treatment of changing the arrangement position of each conveying roller body contributes to obtaining the above-described effect. To do.

  Next, a modified example will be described. FIG. 15 corresponds to FIG. 14, and is an explanatory view showing the arrangement of the opposing roller bodies 302 of the detection unit counter roller 300 of the first modified example instead of the detection unit counter transfer roller 202, and FIG. 16 shows the detection unit counter transfer roller 202. It is explanatory drawing which shows the mode of arrangement | positioning of each opposing body 352 of the detection part opposing body 350 instead of.

  In the modification shown in FIG. 15, the arrangement of the permanent magnet 212 and the magnetoresistive element 214 is the same as that of the above-described embodiment, and the size of the opposed roller bodies 302_1 to 302_7 of the detecting unit facing roller 300 is determined by the detecting unit. It is the same as the conveyance roller bodies 202_1 to 202_7 of the opposite conveyance roller 202. In this modification, the counter roller bodies 302_1 to 302_7 of the detection unit counter roller 300 are connected to the adjacent counter roller by the shaft 304, and each counter roller connected by the shaft 304 is weight balanced. And suspended by a spring 306. Each of the opposing roller bodies 302_1 to 302_7 suspended and held by the spring 306 can move up and down from the balance between its own weight and the elastic force of the spring 306, and rotates by contacting the bill S to be conveyed. It is configured to And even if it exists in each of this counter roller body 302_1-302_7, it acts on the banknote S of a conveyance process so that the separation of the banknote S which passes the magnetic detection part 210, and the magnetic detection part 210 may be adjusted.

  In the modification shown in FIG. 16, the arrangement of the permanent magnet 212 and the magnetoresistive element 214 is the same as that of the above-described embodiment, that is, the left-right direction on the paper surface of the opposed bodies 352_1 to 352_7 of the detecting section opposed body 350, that is, The size in the conveyance path width direction is the same as the roller height of the conveyance roller bodies 202_1 to 202_7 of the detection unit facing conveyance roller 202. In this modified example, each of the opposing bodies 352_1 to 352_7 of the detecting section opposing body 350 is held suspended by a spring 306. Thus, each of the opposing bodies 352_1 to 352_7 suspended and held by the spring 306 can move up and down due to the balance between its own weight and the elastic force of the spring 306, and the banknote S and the magnetic detection unit passing through the magnetic detection unit 210. It acts on the banknote S in a conveyance process so that the gap with 210 may be adjusted. Even in these modified examples, the same effects as those of the above-described embodiments can be obtained.

  FIG. 17 is an explanatory view showing the configuration of the magnetoresistive element 214 in another modified example, and FIG. 18 is an equivalent view of FIG. 14 and an explanatory view showing the arrangement when the magnetoresistive element 214 of this modified example is used. It is.

  As shown in FIG. 17, in this modification, the magnetoresistive element 214 is separated into a low-sensitivity magnetoresistive element 214L and a high-sensitivity magnetoresistive element 214H. Arranging the elements 214L corresponds to the single magnetoresistive element 214 shown in FIG. The high-sensitivity magnetoresistive element 214H and the low-sensitivity magnetoresistive element 214L are different in circuit forming material used for forming the magnetic circuit pattern, and the high-sensitivity magnetoresistive element 214H is a high-sensitivity material that is highly sensitive to magnetic changes and is magnetic. An element on which a circuit pattern is formed. The low-sensitivity magnetoresistive element 214L is an element in which a magnetic circuit pattern is formed of a low-sensitivity material with low sensitivity to magnetic changes. Then, when arranging the resistance elements having high and low sensitivities, as shown in FIG. 18, the low-sensitivity magnetoresistive element 214L and the high-sensitivity magnetoresistive element 214H may be arranged individually. The effects described above can be achieved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and can be implemented in various modes without departing from the scope of the present invention. For example, in FIGS. 14 to 15, the permanent magnet 212 and the magnetoresistive element 214 are positioned on the lower side in the vertical direction in the discrimination conveyance path 40 </ b> P, and the detection unit facing roller 300 or the detection unit facing body 350 is positioned on the upper side in the vertical direction. However, it can also be arranged in reverse. In this case, the detection unit facing roller 300 and the detection unit counter body 350 are supported by the spring 306 so that the detection unit counter roller 300 and the detection unit counter body 350 move up and down, and the elastic force of the spring 306 opposes the detection unit counter roller 300 and the detection unit. The body 350 may be biased upward toward the magnetoresistive element 214 so that the distance from the magnetoresistive element 214 is within a specified range. In place of the spring 306, the detecting unit facing roller 300 and the detecting unit facing body 350 may be engaged and held by other members that exhibit elasticity or elasticity.

  In the above-described embodiment and its modification, the magnetoresistive element 214 is opposed to the permanent magnet 212. However, the magnetoresistive element 214 is a magnetic sensor having a magnetic effect as a sensor detection principle, for example, a current magnetic field effect. A magnetic sensor having a sensor detection principle such as a magnetostriction effect, an inverse effect of magnetostriction, and a magneto-impedance effect can be used.

DESCRIPTION OF SYMBOLS 30 ... Banknote depositing / withdrawing part 30a ... Depositing part 30b ... Withdrawing part 30Pa ... Depositing conveyance path 30Pb ... Withdrawing conveyance path 31 ... Partition plate 31G ... Gate 32 ... Pressing plate 40 ... Bill discriminating part 40P ... Differentiation conveying path 40S ... Passing sensor 50 ... Temporary storage 50Pa ... Temporary storage conveyance path 50Sa ... Empty detection sensor 50Sb ... Full detection sensor 60 ... Banknote storage 60P ... Rejection conveyance path 70 ... Banknote storage 70P ... Storage conveyance path 71 ... Banknote cassette 80 ... Control unit 81 ... Main control unit 82 ... Central control unit 83 ... Storage unit 84 ... Deposit / withdrawal control unit 85 ... Identification control unit 85a ... Data processing unit 85b ... Authentication identification unit 86 ... Temporary storage unit control unit 87: Storage control unit 90 ... Line control unit 91 ... Sensor drive unit 92 ... Gate drive unit 93 ... Conveyance path motor drive unit 94 ... Conveyance path movement meter Several parts 95 ... Bill conveyance monitoring part 100 ... Automatic cash transaction apparatus 101 ... Bill handling apparatus 101a ... Upper unit 101b ... Safe unit 102 ... Coin handling apparatus 103 ... Passbook handling apparatus 104 ... Card statement handling apparatus 105 ... Customer operation part 142 ... Guide plate 150 ... Upstream conveying roller pair 152 ... Downstream roller pair 154 ... Optical sensor 200 ... Magnetic identification unit 202 ... Detecting unit opposite conveying roller 202_1 to 202_i ... Conveying roller body 204 ... Rotating shaft 210 ... Magnetic detecting unit 212 ... Permanent Magnet 214 ... Magnetoresistive element 214H ... High sensitivity magnetoresistive element 214L ... Low sensitivity magnetoresistive element 214h ... Magnetoresistive element 216 ... Power source 218 ... Resistor 220 ... Resistor 222 ... Comparator 224 ... Amplifier 226 ... AD converter 300 ... Detector Opposing rollers 302_1-302 _7 ... Opposing roller body 304 ... Shaft 306 ... Spring 350 ... Sensing unit opposing body 352_1 to 352_7 ... Opposing body S ... Banknote M ... Magnetic flux MP ... Magnetic circuit pattern SS ... Security thread

Claims (8)

A paper sheet identification device that forms a magnetic flux in a conveyance path of a paper sheet to be identified, and identifies the paper sheet based on a change in magnetic flux accompanying the conveyance of the paper sheet,
A magnetic detection unit that is provided along a conveyance path width direction intersecting a conveyance direction of the paper sheet, and that detects the magnetic flux change while forming the magnetic flux;
A plurality of conveyance adjustment units acting on the paper sheets in the conveyance process so as to adjust the distance between the paper sheets passing through the magnetic detection unit and the magnetic detection unit;
At least one of the plurality of conveyance adjustment units is arranged along the conveyance path width direction in response to a variation in detection sensitivity that appears along the conveyance path width direction in the magnetic detection unit. apparatus.   The paper sheet discriminating apparatus according to claim 1, wherein the conveyance adjustment unit is disposed to face the magnetic detection unit in a low-sensitivity region where the detection sensitivity of the magnetic detection unit is lower than other regions.   The said conveyance adjustment part adjacent in the highly sensitive area | region where the detection sensitivity of the said magnetic detection part is high compared with another part is arrange | positioned at intervals, and it adjoins on both sides of this highly sensitive area | region. Paper sheet discrimination device. The paper sheet discriminating device according to claim 3,
The magnetic detection unit is configured to arrange a plurality of magnetic bodies forming the magnetic flux adjacent to each other along the conveyance path width direction by changing a magnetic pole direction for each adjacent magnetic body, and to use a magnetic effect as a sensor detection principle. Provided with a magnetic sensor facing each magnetic body,
With the boundary of the adjacent magnetic body as the low-sensitivity portion, the conveyance adjustment unit is faced with the magnetic body including the boundary,
The paper sheet discriminating apparatus that arranges the adjacent conveyance adjustment units side by side so that the interval between the conveyance adjustment units faces the magnetic body.   5. The paper sheet discrimination according to claim 1, wherein each of the transport adjustment units is a transport roller that is driven and rotated so as to transport the paper sheet along the transport direction. apparatus.   The transport adjustment unit includes a facing member that faces the magnetic detection unit across the paper sheet that is transported along the transport direction, and the facing member that is engaged with the facing member and faces the magnetic detection unit The paper sheet discriminating apparatus according to any one of claims 1 to 4, further comprising an elastic holding member that causes the movement of the paper sheet.   The paper sheet discriminating apparatus according to claim 6, wherein the adjacent facing members are engaged with the common elastic holding member.   The plurality of conveyance adjustment units have a wide and narrow difference in width along the conveyance path width direction, and the wide conveyance adjustment unit is a low-sensitivity region where the detection sensitivity of the magnetic detection unit is lower than other regions. The paper sheet discriminating apparatus according to claim 1, wherein the paper sheet discriminating apparatus is disposed so as to face the magnetic detection unit.

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