JP5997018B2 - Paper sheet thickness detection device and paper sheet identification device - Google Patents

Description

  The present invention relates to a paper sheet thickness detection device that detects the thickness of paper sheets such as banknotes, and a paper sheet identification device including the same.

In automatic teller machines (ATMs) and cash dispensers (CDs), the number of banknotes to be deposited or banknotes to be paid is determined, the banknote denomination and authenticity are determined, and the presence or absence of foreign matter on the banknotes is detected. Etc. are performed. Therefore, by detecting the displacement of the displacement roller the sheets conveyed sandwiched between the reference roller and the displacement roller, it varies according to the thickness of the nipped sheet, the thickness of the sheet Has been proposed (see Patent Documents 1 and 2).

  FIG. 9 is an explanatory diagram illustrating an example of a method for detecting the thickness of a paper sheet. FIG. 9 shows a part of the schematic front as viewed from the direction in which the paper sheet is conveyed, taking the thickness detection device described in Patent Document 1 as an example. This thickness detection device has a rotating shaft that is vertically opposed to each other along a horizontal direction (hereinafter, also simply referred to as “transport width direction”) corresponding to the width direction of the paper sheet perpendicular to the paper sheet transport direction. 38R, 37R, a plurality of (two in the illustrated example) fixed rollers 36R inserted through a lower rotation shaft (also called “fixed roller shaft”) 37R, and an upper rotation shaft (“displacement roller shaft”). A plurality of displacement rollers 34R that are inserted through 38R and are arranged to face each of the fixed rollers 36R, and a plurality of displacement sensors 33R. The figure shows a state in which two fixed rollers 36R and two displacement rollers 34R are arranged. Further, two displacement sensors 33R are arranged for each displacement roller 34R, at two positions at positions corresponding to both ends of the roller at spaced positions above it.

  The displacement roller 34R includes a metal outer ring (also referred to as “displacement roller outer ring”) 32R, and an elastic member 39R that is fixedly connected to the displacement roller shaft 38R and filled inside the displacement roller outer ring 32R. It is structured to rotate integrally with the roller shaft 38R. As shown in FIG. 9A, normally, the displacement roller 34R and the reference roller 36R face each other and are in a state of being pressed and contacted by the elastic member 39R inside the displacement roller outer ring 32R of the displacement roller 34. As shown in FIG. 9B, when the paper sheet 30 is sandwiched between the displacement roller 34R and the reference roller 36R, the elastic member 39R filled inside the displacement roller outer ring 32R is deformed and displaced. The roller outer ring 32R is lifted by the thickness of the paper sheet 30. At this time, the distance between the displacement sensor 33R installed above the displacement roller 34R and the displacement roller outer ring 32R changes. The thickness of the paper sheet 30 is detected by detecting this change with the displacement sensor 33R.

  Although illustration is omitted, the thickness detection in Patent Document 2 is not a plurality of fixed rollers described above, but a plurality of displacement rollers with respect to one fixed roller having a large width (referred to as “reference roller” in Patent Document 2). In the same manner as the thickness detection in Patent Document 1, the displacement of the detection roller is detected by a displacement sensor.

JP 2006-84274 A JP2011-237851A

  FIG. 10 is an explanatory diagram showing the problem of thickness detection shown in FIG. In the configuration of the thickness detection device shown in FIG. 9, the displacement roller 34R and the fixed roller (hereinafter referred to as “reference roller”) are caused by various variations such as dimensional errors of parts used in the device and assembly errors during manufacture of the device. There is a possibility that a positional deviation along the rotation axis direction may occur with the 36R. The detectable portion DP where the thickness of the paper sheet can be detected by the displacement roller 34R is limited to only the portion sandwiched between the reference roller 36R and the displacement roller 34R. Therefore, as shown in FIG. There is a problem that the detectable part DPd (see the right side of the figure) when it occurs is smaller than the detectable part DPt (see the left side of the figure) when there is no positional deviation. Further, in the portion where the displacement roller 34R is present but the reference roller 36R is not present, even if the paper sheet 30 as a detection target exists, the displacement roller 34R is not displaced, and the detection is insensitive. Partial NDP. In this insensitive portion NDP, even if the foreign matter (for example, tape) TA attached to the paper sheet 30 exists, the paper sheet 30 is sandwiched even though the displacement roller 34R is on the foreign material TA. Therefore, the paper sheet 30 can be freely deformed, and the displacement roller 34R cannot be displaced according to the thickness of the paper sheet 30 and the foreign object TA. In addition, since the size of the insensitive portion NDP is indefinite due to manufacturing variations such as the above-described component dimensional error and assembly error, the size of the insensitive portion NDP causes variation in the thickness detection output.

  10B, when only a part of the paper sheet 30 is caught on the displacement roller 34, the displacement roller 34R is in a single floating state, and the actual state of the paper sheet 30 is It is known that it appears to be displaced more than the thickness. As shown in the right side of FIG. 10B, when the position of the reference roller 36 is displaced in the rotation axis direction by the amount of deviation Vpa with respect to the displacement roller 34R, the displacement on the left side of the reference roller 36R. The end of the roller 34R cannot contact the reference roller 36R and falls, and the angle θd of the one-side lift of the displacement roller 34R becomes larger than the angle θt when the left side of FIG. End up. If the angle of the single float increases, the amount of single float increases accordingly, and the displacement error Dg increases. Therefore, it is more difficult to accurately detect the thickness of the paper sheet 30 by the displacement sensor 33R. Become. The displacement error Dg increases as the position of the end point when the displacement roller 34R floats away from the contact point with the reference roller, that is, as the displacement amount Vpa of the reference roller in the rotation axis direction with respect to the displacement roller 34R increases. Become.

  Moreover, in order to detect the thickness distribution of paper sheets in detail, it is desirable to reduce the width of the displacement roller and provide a large number of displacement rollers. However, providing a large number of displacement rollers simultaneously complicates the structure and tends to cause manufacturing variations. Further, if the component size of the displacement roller is reduced, it becomes more difficult to devise the shape of the elastic member filled in the inside. Further, since the displacement is obtained in accordance with the thickness by deformation of the mechanical structure, a simple and robust configuration is desirable as much as possible in order to avoid failure for many years.

  In view of the above, the object of the present invention is to provide a position along the rotational axis direction of the displacement roller and the reference roller in a paper sheet thickness detection device including a plurality of displacement rollers and a plurality of reference rollers with a simple configuration. By suppressing the insensitive part of the displacement roller due to misalignment, and further suppressing the displacement error of the displacement roller due to one-sided floating, it is possible to suppress variations in detection due to component dimensional variations and manufacturing variations that occur during mass production. An object of the present invention is to provide a technique for detecting the thickness of paper sheets with high accuracy.

  In order to solve the above-mentioned problems, a sheet thickness detecting device for detecting the thickness of a sheet according to the present invention includes a reference roller axis; a displacement roller axis facing the reference roller axis; and a reference roller axis. A plurality of reference rollers that are inserted and arranged to rotate about the reference roller axis; and are arranged to be inserted into the displacement roller axis so as to face each of the reference rollers, and the center rotates so as to be displaceable with respect to the displacement roller axis A plurality of displacement rollers; a displacement in which the displacement roller is displaced according to the thickness of the paper sheet with respect to the reference roller when the conveyed paper sheet is sandwiched between the reference roller and the displacement roller A plurality of displacement sensors for detecting amounts respectively. And in the state where the reference roller and the displacement roller are arranged to face each other, both end positions in the direction along the displacement roller axis of the displacement roller are more than both end positions in the direction along the reference roller axis of the reference roller. The reference roller width in the direction along the reference roller axis of the reference roller is set to be longer than the displacement roller width so as to be on the inner side.

  According to the present invention, even when a positional deviation occurs between the displacement roller and the reference roller, the occurrence of the insensitive part of the displacement roller and the displacement error due to the floating of the displacement roller described in the problem are suppressed. Therefore, it is possible to reduce the variation in detection by the displacement sensor and to detect the thickness of the paper sheet with high accuracy.

It is a schematic block diagram which shows the banknote conveying apparatus comprised in ATM as Example 1. FIG. It is a schematic block diagram which shows the main structures of the identification part of FIG. It is a schematic block diagram which shows the internal structure of the thickness detection part of FIG. It is explanatory drawing shown about the basic operation | movement of a thickness detection part. It is explanatory drawing shown about the detection operation | movement when the displacement roller and reference | standard roller of a thickness detection part have shifted position. It is explanatory drawing which compares the thickness detection dispersion | variation in the structure of an Example with the thickness detection dispersion | variation in a conventional structure. It is a schematic block diagram which shows the internal structure of the thickness detection part in Example 2. FIG. It is explanatory drawing shown about the function of a paper sheet conveyance guide part. It is explanatory drawing which shows an example of the method of thickness detection of paper sheets. It is explanatory drawing shown about the problem of the thickness detection shown in FIG.

(1) Outline of bill transport device FIG. 1 is a schematic configuration diagram showing a bill transport device configured in an ATM as a first embodiment. This banknote transport apparatus 1000 accumulates the counted banknotes temporarily, the banknote denomination, authenticity, orientation, and identification part 2 for identifying the degree of damage, and banknotes by type. Storage units 3a to 3d, a collection unit 4 for storing banknotes rejected by the identification unit 2, a deposit port 20, a withdrawal port 21 with a shutter, and a return port 22. Moreover, the banknote transport apparatus loops the deposit port 20, the identification unit 2, the temporary holding unit 1, the withdrawal port with shutter 21, and the return port 22 to transport the banknotes, and the upper transport path 5 And a lower transport path 6 that transports the bills again to the upper transport path 5 via the storage sections 3a to 3d and the collection section 4.

  Between the deposit port 20 and the upper transport path 5 is provided a deposit port transport path 7 for transporting banknotes from the deposit port 20 to the upper transport path 5, and between the withdrawal port with shutter 21 and the upper transport path 5. Is provided with a withdrawal port conveyance path 8 for conveying banknotes from the upper conveyance path 5 to the withdrawal port 21 with a shutter. Between the return port 22 and the upper transport path 5, a return port transport path 9 for transporting banknotes from the upper transport path 5 to the return port 22 is provided. Between the temporary holding unit 1 and the upper conveying path 5, a temporary holding unit storage conveying path 10 that conveys banknotes from the upper conveying path 5 to the temporary holding unit 1, and a temporary holding unit 1 to the upper conveying path 5. There is provided a temporary holding unit feeding conveyance path 11 for conveying bills. Between the storage units 3a to 3d and the lower transport path 6, the storage unit storage transport paths 12a to 12d for transporting banknotes from the lower transport path 6 to the storage units 3a to 3d, and the lower transport from the storage units 3a to 3d. Storage section feeding and conveying paths 13a to 13d for conveying bills to the path 6 are provided. Between the collection unit 4 and the lower conveyance path 6, a collection unit conveyance path 14 that conveys banknotes from the lower conveyance path 6 to the collection unit 4 is provided.

  The branch of the conveyance path 8, 9, 10 provided between the upper conveyance path 5 and each part 21, 22, and 1 is a passage sensor 15 provided at each branch portion for detecting passage of a bill, And it is performed by the gate 16 which switches the conveyance path which conveys a banknote according to the detection by the passage sensor 15. FIG. The same applies to the branch of the transport paths 12a to 12d provided between the lower transport path 6 and the parts 3a to 3d and 4 and the branch between the upper transport path 5 and the lower transport path 6.

  A deposit port bill detection sensor 17 is provided at the deposit port 20, a withdrawal port bill detection sensor 18 is disposed at the withdrawal port 21 with a shutter, and a return port bill detection sensor 19 is disposed at the return port 22. These sensors detect whether or not there is a bill in each mouth, and processing according to the detection result is executed.

(2) Configuration of Identification Unit FIG. 2 is a schematic configuration diagram showing a main configuration of the identification unit in FIG. The identification unit 2 is provided with a paper sheet transport mechanism 31 for performing identification while transporting paper sheets 30 such as banknotes guided here. In the paper sheet transport mechanism 31, a transport roller unit 23, an optical sensor 24, a magnetic sensor 25, and a thickness detection unit 26 are provided in this order.

  The transport roller unit 23 is constructed along the width direction of the transport path (the vertical direction in the drawing, which is the horizontal direction of the apparatus), and the upper transport roller 23a and the lower transport roller 23b that are vertically opposed to each other, It has. These upper and lower transport rollers 23a and 23b receive a rotational driving force from a transport motor (not shown), and sandwich the paper sheets 30 from the top and bottom to transport them one by one. The upper and lower transport rollers 23a and 23b are formed of an elastic member such as rubber so that they can be smoothly transported to paper sheets such as broken banknotes or broken banknotes such as broken banknotes. Therefore, it has a structure with high conveyance tolerance.

  The optical sensor 24 assumes that the conveyed paper sheet 30 is a banknote, and checks its design and color. The magnetic sensor 25 also identifies the magnetism of the magnetic ink applied to the conveyed paper sheet 30 assuming that it is a banknote. The thickness detector 26 detects the thickness of the paper sheet 30 and the presence or absence of a tape. Then, the control unit 28 determines the denomination, the number of sheets, and the authenticity based on data obtained by the optical sensor 24, the magnetic sensor 25, and the thickness detection unit 26. The identification unit 2 corresponds to the “paper sheet identification device” of the present invention. Further, the thickness detection unit 26, or the thickness detection unit 26 and the control unit 28 correspond to the “paper sheet thickness detection device” of the present invention.

  As described above, the identification unit 2 identifies which denomination is the paper sheet 30 conveyed here as a banknote, and identifies whether it is a genuine note or a fake note. Furthermore, the banknotes used for transactions are managed by identifying whether or not two or more sheets overlap. Note that the paper sheet transport mechanism 31 is configured to be able to identify whether the paper sheet 30 is transported from either direction.

(3) Configuration of Thickness Detection Unit FIG. 3 is a schematic configuration diagram showing an internal configuration of the thickness detection unit of FIG. 3A is a front view seen from the direction side along the conveyance direction, for example, the magnetic sensor 25 side of FIG. 2, and FIG. 3B is an enlarged view of a part of FIG. FIG. The thickness detection unit 26 has a width direction of the conveyance path (left and right direction in the drawing as a rotation axis) to which a rotational driving force is transmitted from a conveyance drive system (not shown) of the paper sheet conveyance mechanism 31. A reference roller shaft 37 installed along the horizontal direction) and a displacement roller shaft 38 installed opposite to the upper side of the reference roller shaft 37 are disposed.

  A plurality (six in the illustrated example) of reference rollers 36a to 36f are inserted and arranged on the lower reference roller shaft 37 at a constant narrow interval. The plurality of reference rollers 36a to 36f are collectively referred to as a “reference roller group 36G”. Further, when the plurality of reference rollers 36a to 36f are not particularly distinguished, they are also referred to as “reference rollers 36”.

  In addition, a plurality (six in the illustrated example) of displacement rollers 34a to 34f are inserted into the upper displacement roller shaft 38 so as to face the reference rollers 36a to 36f. The plurality of displacement rollers 34a to 34f are collectively referred to as a “displacement roller group 34G”. Further, when the plurality of displacement rollers 34a to 34f are not particularly distinguished, they are also referred to as “displacement rollers 34”.

  Each of the displacement rollers 34a to 34f is elastically deformable filled between an outer ring (displacement roller outer ring) 32a to 32f made of a cylindrical member such as metal and a displacement roller shaft 38 serving as a central axis thereof. And elastic members 39a to 39f such as rubber. Note that when the displacement rollers 34a to 34f are not particularly distinguished as described above, the displacement roller outer rings 32a to 32f are also not particularly distinguished and are also referred to as “displacement roller outer rings 32”. The displacement roller outer ring 32 can be formed, for example, by applying hard chrome plating to SUS304 (stainless steel). In addition to this, an inelastic material can be used as the material of the displacement roller outer ring 32. The reference rollers 36 to 36f are made of metal, and are provided as reference surfaces whose outer peripheral surfaces are not displaced, to which the displacement rollers 34a and 34b are in contact. And each displacement roller 34a-34f is pressed by corresponding reference | standard roller 36a-36f, respectively, and rotates. Further, when the paper sheet 30 is sandwiched between the displacement roller 34 and the reference roller 36, the displacement roller outer ring 32 of the displacement roller 34 that faces the outer peripheral surface of the reference roller 36, which is the reference surface, becomes the paper sheet 30. Is displaced upward (in the direction from the reference roller shaft 37 toward the displacement roller shaft 38) in accordance with the thickness of the roller.

  Above the plurality of displacement rollers 34, a plurality of displacement sensors 33 arranged to face at least one displacement roller for each displacement roller 34, and a sensor processing unit 35 that processes data obtained from the plurality of displacement sensors 33. And are arranged. In this example, two displacement sensors 33 are arranged on both ends of each displacement roller 34. Moreover, the code | symbol of each displacement sensor is attached | subjected like 33a1, 33a2-33f1, 33f2 according to the code | symbol of corresponding displacement roller 34a-34f. The plurality of displacement sensors 33a1, 33a2-33f1, 33f2 are collectively referred to as “displacement sensor group 33G”. In each displacement sensor 33, based on the change of the magnetic field generated by the coil inside the sensor, the displacement roller 34 facing each of the displacement sensors 33 moves in the vertical direction according to the thickness of the paper sheet sandwiched between the reference rollers 36. A sensor capable of detecting a displacement amount that is elastically displaced (also referred to as “roller displacement amount”), for example, an eddy current magnetic field type displacement sensor can be used.

  The width (hereinafter also referred to as “displacement roller width”) Lw along the rotation axis direction of the displacement roller 34 is set based on specifications required for design as a width to be detected by one displacement roller. The width (hereinafter also referred to as “reference roller width”) Lr of the reference roller 36 along the rotation axis direction is such that Lr> Lw with reference to the width Lw of the displacement roller 34 as shown in FIG. Set to Specifically, the end position of the displacement roller 34 is set so as to be inside the end position of the reference roller 36. More specifically, when the displacement roller 34 and the reference roller 36 are arranged so that the center positions of the respective widths coincide with each other, the difference Lm between the end position of the displacement roller 34 and the end position of the reference roller 36 is: It is set to be larger than the deviation amount ΔL generated from the dimensional error of each component and the respective mounting error. The effect of setting the reference roller width Lr larger than the displacement roller width Lw will be described later.

  With the above configuration, when the paper sheet 30 transporting the transport path passes between the displacement roller group 34G and the reference roller group 36G, the portion of the displacement roller 34 through which the paper sheet 30 has passed is lifted and elastic. The displacement and the generated displacement are detected by the displacement sensor 33, and the thickness of the paper sheet 30 can be detected according to the detected displacement. Further, since the displacement due to the passage of the paper sheets can be detected in each of the plurality of displacement rollers 34 (34a to 34f), the in-plane distribution of the thickness of the paper sheets can be detected. In addition, as the number of the displacement rollers 34 increases, the in-plane distribution of the thickness of the paper sheet can be detected in more detail.

  FIG. 4 is an explanatory diagram showing the basic operation of the thickness detector. 4 is similar to FIG. 3B, in the thickness detection unit 26 shown in FIG. 3A, two displacement sensors 33a1, 33a2, a displacement roller 34a, and a reference roller arranged in the vertical direction. 36a, and a right detection portion consisting of two displacement detection sensors 33b1 and 33b2, a displacement roller 34b, and a reference roller 36b arranged in the vertical direction on the right side. It shows. Hereinafter, these two sets of detection parts will be described as examples.

  When the paper sheet 30 is bitten between the two sets of roller surfaces of the left and right reference rollers 36a and 36b and the left and right displacement rollers 34a and 34b, the elastic members 39a and 39b are equal to the thickness of the paper sheet 30. Deformation causes the displacement roller outer rings 32a and 32b to be displaced upward. The amount of displacement is detected by the two displacement sensors 33a1 and 33a2 on the left side and the two displacement sensors 33b1 and 33b2 on the right side, and is output to the sensor processing unit 35.

  The sensor processing unit 35 processes the detection signal corresponding to the obtained displacement amount and sends a signal including data corresponding to the thickness of the paper sheet 30 to the control unit 28 (FIG. 2) of the identification unit 2. Based on the thickness data of the paper sheet 30 included in the transmitted signal, the control unit 28 determines whether or not two or more paper sheets 30 are transported in an overlapping manner, is not a modified ticket with a tape or the like attached, Judge whether it is a ticket or a fake ticket. Further, by disposing two displacement detection sensors 33a1 and 33a2 at both ends with respect to one displacement roller 34a, for example, when a tape is stuck as a foreign object TA on the paper surface (see FIG. 4), Since both end portions are in contact with the left and right displacement rollers 34a and 34b, and the respective displacement rollers 34a and 34b are unilaterally laid on the tape and tilt in opposite directions, displacement is detected in each of the displacement rollers 34a and 34b. can do.

  FIG. 5 is an explanatory diagram illustrating a detection operation when the displacement roller and the reference roller of the thickness detection unit are misaligned. As shown in FIG. 3B, the reference roller width Lr of the reference roller 36 (36a, 36b) is displaced even if a deviation amount ΔL occurs due to a dimensional error or a mounting error of the reference roller 36 and the displacement roller 34. It is longer than the displacement roller width Lw of the displacement roller 34 (34a, 34b) so that both ends of the reference roller 36 are on the outer side than both ends of the roller 34. For this reason, even if the maximum positional deviation occurs between the displacement roller and the reference roller, the both end positions of the displacement roller 34 can be set inside the both end positions of the reference roller 36 as shown in FIG. Therefore, the paper sheet 30 can be held together with the reference roller 36 at any position of the displacement roller 34. As a result, the entire width Lw of the displacement roller 34 can be set as the detectable portion DP. Therefore, the insensitive portion NDP is generated in the displacement roller 34 due to the positional deviation as described in FIG. It is possible to prevent the detectable portion DP from decreasing. Further, it is possible to prevent foreign matter TA such as a tape attached to the paper sheet 30 from being undetectable by the insensitive portion NDP as described with reference to FIG.

  Further, as shown in FIG. 5, also in this embodiment, when only the end of the paper sheet 30 is applied to the displacement roller 34, as described in FIG. Thus, an error occurs between the displacement amount of the displacement roller 34 and the actual thickness of the paper sheet 30. However, by making the reference roller width Lr of the reference roller 36 longer than the displacement roller width Lw of the displacement roller 34 as described above, even if the displacement roller 34 is in a one-sided floating state, one end of the displacement roller 34 falls. Therefore, one end of the displacement roller 34 can be brought into contact with the reference roller 36, so that an error from the actual thickness of the paper sheet 30 can be reduced.

  FIG. 6 is an explanatory diagram showing the thickness detection variation in the structure of the embodiment in comparison with the thickness detection variation in the conventional structure. In order to detect foreign matters such as the type and authenticity of banknotes and tapes attached to banknotes based on slight differences in the thickness of paper sheets, it is easy to detect variations in the thickness of real banknotes. What is necessary is just to construct | assemble an algorithm so that it may determine from the difference in thickness variation of paper sheets. However, since the actual thickness detection results include variations in the detection output of the thickness detection device in addition to the variations in the thickness of the paper sheets, the thickness detection results are wider than the actual thickness of the paper sheets. It will be detected as if it is scattered.

  As described with reference to FIG. 9, in the conventional structure, the insensitive portion NDP is formed under the displacement roller 34 </ b> R due to a positional shift due to manufacturing variations of the displacement roller 34 </ b> R and the reference roller 36 </ b> R. Further, when the end of the paper sheet is hooked, the error between the roller displacement amount and the actual thickness of the paper sheet becomes large due to the displacement roller piece floating. Therefore, due to these problems, the detected thickness varies more widely than the actual thickness variation of the paper sheets.

  However, as shown in FIG. 6, in the structure of this embodiment, since the variation element due to these problems (variation due to roller position deviation) can be removed, the thickness to be detected is more than that of the conventional paper. It is possible to approximate the actual thickness variation of leaves. As a result, the threshold for constructing the algorithm can be tightened, so that the difference between a clever counterfeit ticket and a genuine one can be determined more easily. Further, since no special mechanism or structure is required as compared with the conventional configuration, the same robustness as that of the conventional configuration can be maintained and the cost is not increased.

  As described above, in this embodiment, it is possible to reduce the variation in displacement sensor output due to the displacement of the displacement roller and the reference roller in the rotation axis direction, and to improve the accuracy of detecting the thickness of the paper sheet. As a result, it is possible to reduce identification errors of paper sheets.

  In the above description, an eddy current displacement sensor is used as the displacement sensor 33. This eddy current type displacement sensor applies a high-frequency magnetic field generated by applying a high-frequency current to a coil inside the sensor in advance to the displacement roller, and when the outer ring of the displacement roller is displaced, the displacement roller is displaced according to the amount of displacement. The impedance of the coil generated by the change in the eddy current generated in the surface of the roller outer ring changes, and the amount of displacement is detected from the change in the oscillation state of the high-frequency current of the coil that changes according to the change in the impedance. However, the displacement sensor is not limited to this, and includes a means for generating a high-frequency magnetic field and applying it to the displacement roller, and a means for detecting a change in the magnetic field generated according to the displacement of the displacement roller. You may use what is done. As a means for generating a high-frequency magnetic field, a high-frequency magnetic field generator that generates a high-frequency magnetic field by flowing a high-frequency current through a coil can be used as in the eddy current displacement sensor. As means for detecting a change in the magnetic field, a magnetoresistive (MR) element or a magnetic impedance (MI) element can be used. Further, the displacement sensor is not limited to the one using the above-described magnetic field, and may be any sensor that can read the displacement of the displacement roller outer ring of the displacement roller to be detected. As an example, an ultrasonic sensor or an optical sensor using reflection from an object may be used. In general, a non-contact type displacement sensor is desirable to avoid the influence of friction with the rotating roller, but a contact type sensor may be used as long as the problem of friction with the roller can be solved.

  FIG. 7 is a schematic configuration diagram illustrating an internal configuration of the thickness detection unit according to the second embodiment. In addition, since the structure of the identification part provided with the thickness detection part 26B of a present Example and the banknote conveying apparatus provided with this identification part is the same as the identification part 2 and the banknote conveying apparatus 1000 in Example 1, it is illustrated and demonstrated. Is omitted.

  As can be seen from the thickness detector 26B of the present embodiment when compared with the thickness detector 26 (FIG. 3) of the first embodiment, a displacement roller side guide provided between the displacement rollers 34 (34a to 34f). This paper is provided with a paper sheet transport guide section composed of 100u and a reference roller side guide 100l provided between each reference roller 36 (36a to 36f) to face the displacement roller side guide. The leaf conveyance guide part is provided for the following reason.

  FIG. 8 is an explanatory diagram showing functions of the paper sheet transport guide unit. As shown in FIG. 8 (A), the displacement roller 34 and the reference roller 36 of the thickness detection unit 26 are cylindrical rotating bodies. Therefore, in order to avoid friction, usually other structures such as front and rear, for example, an identification unit 2, a gap is provided between the magnetic sensor 25 and the magnetic sensor 25. This gap causes the paper sheet 30 that has been conveyed to deform within the gap and cause a paper jam (jam). Therefore, in the thickness detection unit 26B of the present embodiment, as shown in FIGS. 7 and 8B, a paper sheet conveyance guide unit configured with a displacement roller side guide 100u and a reference roller side guide 100l between the rollers. Thus, the paper sheets 30 are conveyed without being deformed by bridging between the gaps.

  Also in this embodiment, it is possible to reduce the variation in displacement sensor output due to the displacement of the displacement roller and the reference roller in the rotation axis direction, and to improve the accuracy of detecting the thickness of the paper sheet. It is possible to reduce identification errors. Further, it is possible to prevent a paper jam (jam) that occurs due to a gap between the thickness detection unit and the other front and rear structures.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

DESCRIPTION OF SYMBOLS 1 ... Temporary reservation part 2 ... Identification part 3a-3d ... Storage part 4 ... Collection | recovery part 5 ... Upper conveyance path 6 ... Lower conveyance path 7 ... Deposit port conveyance path 8 ... Withdrawal port conveyance path 9 ... Return port conveyance path 10 ... Temporary holding part storage conveyance path 11 ... Temporary holding part feeding conveyance path 12a-12d ... Storage part storage conveyance path 13a-13d ... Storage part feeding conveyance path 14 ... Collection part conveyance path 15 ... Passing sensor 16 ... Gate 17 ... Deposit banknote Detection sensor 18 ... Withdrawal banknote detection sensor 19 ... Return opening banknote detection sensor 20 ... Deposit opening 21 ... Withdrawal outlet 22 ... Return opening 23 ... Transport roller section 23a ... Upper transport roller 23b ... Lower transport roller 24 ... Optical Type sensor 25 ... Magnetic sensor 26 ... Thickness detection unit 26B ... Thickness detection unit 28 ... Control unit 30 ... Paper sheet 31 ... Paper sheet conveyance mechanism 32 ... Displacement roller outer ring 32a-32f ... Displacement Wheeler outer ring 33 ... Displacement sensor 33G ... Displacement sensor group 33a1-33f1, 33a2-33f2 ... Displacement sensor 34 ... Displacement roller 34G ... Displacement roller group 34R ... Displacement roller 34a-34f ... Displacement roller 35 ... Sensor processing unit 36 ... Reference roller 36G ... reference roller group 36R ... reference rollers 36a-36f ... reference roller 37 ... reference roller shaft 38 ... displacement roller shaft 39a-39f ... elastic member 100l ... reference roller side guide 100u ... displacement roller side guide 1000 ... banknote transport device TA ... foreign matter DP ... Detectable part Lr ... Reference roller width Lw ... Displacement roller width NDP ... Insensitive part

Claims (4)

A sheet thickness detecting device for detecting the thickness of a sheet,
A reference roller shaft,
A displacement roller shaft facing the reference roller shaft;
A plurality of reference rollers that are inserted through the reference roller shaft and rotate about the reference roller shaft;
Opposite the reference rollers, they are inserted through the displacement roller shafts, and a central axis can be inclined with respect to the displacement roller shafts, and the reference roller shafts and the displacement roller shafts are displaced along the facing direction. A plurality of displaceable rollers rotating,
When the transported paper sheet is sandwiched between the reference roller and the displacement roller, a plurality of displacement amounts respectively detected by the displacement roller that is displaced according to the thickness of the paper sheet with respect to the reference roller. A plurality of displacement sensors respectively disposed at both ends of the displacement roller in a direction along the displacement roller axis, for each displacement roller ;
With
In a state where the reference roller and the displacement roller are arranged to face each other, both end positions in the direction along the displacement roller axis of the displacement roller are inside of both end positions in the direction along the reference roller axis of the reference roller. The reference roller width of the reference roller in the direction along the reference roller axis is set to be longer than the displacement roller width of the displacement roller in the direction along the displacement roller axis. Paper sheet thickness detection device. The paper sheet thickness detection device according to claim 1,
The displacement roller side guide provided between the displacement rollers, and the reference roller side guide provided between the reference rollers so as to face the displacement roller side guide, the displacement roller and the reference roller, A paper sheet thickness detecting device comprising a paper sheet conveyance guide unit for guiding the paper sheet between the two. The paper sheet thickness detecting device according to claim 1 or 2,
The reference roller width is equal to both end positions of the reference roller regardless of the dimensional error of the reference roller width, the dimensional error of the displacement roller width, and the mounting error of the reference roller and the displacement roller. A paper sheet thickness detection apparatus, wherein the sheet thickness detection apparatus is set so as to be positioned inside a position. A paper sheet identification device,
A paper sheet identification apparatus including the paper sheet thickness detection apparatus according to any one of claims 1 to 3.

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