Patent Publication Number: US-11649126-B2

Title: Paper sheet circulation device and circulation-type paper sheet handling device

Description:
RELATED APPLICATIONS 
     This application is the U.S. National Phase of and claims priority to International Patent Application No. PCT/JP2018/018196, International Filing Date May 10, 2018, entitled Paper Sheet Circulation Device And Circulation-Type Paper Sheet Handling Device; which claims benefit of Japanese Application No. 2017-172862 filed Sep. 8, 2017; both of which are incorporated herein by reference in their entireties. 
     FIELD 
     The present invention relates to a tape-winding type paper sheet circulation device provided in a circulation-type paper sheet processing device that has a function of storing paper sheets therein and discharging paper sheets, and more particularly relates to a tape-winding type paper sheet circulation device that can determine a winding direction of a tape on a drum and a circulation-type paper sheet handling device. 
     BACKGROUND 
     There are known various kinds of vending machines, cash deposit/dispense machines, money changers, and the like (circulation-type banknote handling devices) that have a cash deposit function of receiving an inserted banknote (a paper sheet) by denomination and a cash dispense function of dispensing a banknote as change or money to be returned. 
     Patent Literature 1 discloses a circulation-type banknote storing device that is a tape-winding type, including two tapes in the form of long strips, a drum to which one ends in a longitudinal direction of the two tapes are fixed while being overlapped on each other and which is rotatable in a forward direction and a reverse direction, and two reels to which the other ends in the longitudinal direction of the respective tapes are fixed and which are rotatable in a forward direction and a reverse direction. The circulation-type banknote storing device stores therein a banknote by sandwiching it between the two tapes wound in a multilayer state on an outer circumference of the drum. 
     In the tape-winding type paper sheet circulation device, it is determined which one of the ends in the longitudinal direction a corresponding tape end is, and rotation of the drum and the reels is controlled, in order to prevent damage or the like of the tapes by excessive tension applied on the tapes each having a limited length. 
     In the circulation-type banknote storing device of Patent Literature 1, a light-shielding region indicating a tape end is provided at a leading end and a trailing end of one of the tapes, and a light-shielding region indicating a tape end is provided at a trailing end of the other tape. Further, two tape sensors that detect surface states of the respective tapes are arranged in the circulation-type banknote storing device. In a case where only one of the two tape sensors detects the light-shielding region, it is determined that the corresponding tape end is the leading end of the tape. In a case where both the tape sensors detect the light-shielding regions, it is determined that the corresponding tape ends are the trailing ends of the tapes. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Patent Application Laid-open No. 2013-137619 
     SUMMARY 
     Technical Problem 
     When a banknote jam occurs inside a circulation-type banknote storing device, an operator may manually rotate a drum in a banknote-dispensing direction to remove a jammed banknote. However, when rotating the drum in the dispensing direction in a state where the remaining amount of a tape wound on the drum is low, the operator may continue to rotate the drum in the same direction without noticing that the remaining tape has been all fed from the drum. In this case, the tape is wound on the drum in an opposite direction to a proper winding direction. When the device is operated in this state, a banknote cannot be stored and fed smoothly, which may cause another banknote jam or a failure of the circulation-type banknote storing device. 
     The present invention has been made in view of the above problems and it is an object of the present invention to provide a circulation-type paper sheet storing device that is a tape-winding type and can prevent, in advance, a failure and the like of the device caused by winding of a tape in a direction opposite to a proper winding direction, and a circulation-type paper sheet processing device provided with the circulation-type paper sheet storing device. 
     Solution to Problem 
     In order to solve the above problem, the present invention provides a paper sheet circulation device comprising: a tape in a form of a long strip; a drum that supports one end in a longitudinal direction of the tape and winds and feeds the tape by rotating in a forward direction and a reverse direction; and a bobbin that supports the other end in the longitudinal direction of the tape and feeds and winds the tape by rotating in a forward direction and a reverse direction, the device retaining a paper sheet supplied from outside by sandwiching the paper sheet between the tapes and winding the paper sheet and the tapes in a multilayer state on an outer circumference of the drum, wherein the device comprises: a travelling-direction mark having a pattern that is formed along a travelling-direction of the tape and indicates a difference of a travelling-direction of the tape; a mark detection sensor that detects the travelling-direction mark and outputs a detection signal, a pattern acquisition unit that acquires a pattern signal in accordance with a travelling-direction of the tape on a basis of a temporal change of the detection signal; and a travelling-direction determination unit that determines a travelling-direction of the tape from the pattern signal. 
     Advantageous Effects of Invention 
     According to the present invention, it is possible to prevent, in advance, a failure or the like of a device caused by winding of a tape on a drum in a wrong direction. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view illustrating a schematic configuration of a banknote circulation device according to an embodiment of the present invention. 
         FIG.  2    are respectively a diagram illustrating a schematic configuration of the banknote circulation device according to the embodiment of the present invention, where  FIG.  2 ( a )  is a front view and  FIG.  2 ( b )  is a right side view. 
         FIG.  3    are respectively a schematic diagram illustrating a driving mechanism for a drum and bobbins, where  FIG.  3 ( a )  is a plan view,  FIG.  3 ( b )  is a front view, and  FIG.  3 ( c )  is a left side view. 
         FIG.  4    is a schematic diagram illustrating a state of supporting a tape by a drum and bobbins. 
         FIG.  5    is a schematic diagram illustrating an example of a travelling-direction mark. 
         FIG.  6    are respectively a schematic diagram for explaining a relation between a winding direction of a tape on a drum and a travelling-direction of the tape, where  FIG.  6 ( a )  illustrates a normal state and  FIG.  6 ( b )  illustrates a reverse-winding state. 
         FIG.  7    is a functional block diagram illustrating a schematic configuration of a control unit and its periphery of the banknote circulation device. 
         FIG.  8    is a flowchart for explaining an operation of a control unit. 
         FIGS.  9 ( a ) to  9 ( d )  are schematic diagrams respectively illustrating a modification of a travelling-direction mark. 
         FIG.  10    is an explanatory diagram of a schematic configuration of a circulation-type banknote processing device as an example of a banknote handling device to which the banknote circulation device according to the embodiment of the present invention is applied. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A tape-winding type paper sheet circulation device according to the present invention has features that a mark indicating a travelling-direction of a tape is formed on the tape to enable detection of the travelling-direction of the tape and that it can be determined, from the travelling-direction of the tape and a rotation direction of a drum that winds the tape thereon, whether the state of winding of the tape on the drum is normal. 
     In the following embodiment, there is described a device which stores therein or delivers a banknote as an example of a paper sheet. Constituent elements, types, combinations, shapes, and relative arrangements thereof described in the embodiment are merely explanatory examples, and are not intended to limit the scope of the present invention solely thereto unless otherwise specified. 
     [Basic Configuration of Banknote Circulation Device] 
       FIG.  1    is a perspective view illustrating a schematic configuration of a banknote circulation device according to an embodiment of the present invention.  FIG.  2    are respectively a diagram illustrating a schematic configuration of the banknote circulation device according to the embodiment of the present invention, where  FIG.  2 ( a )  is a front view and  FIG.  2 ( b )  is a right side view. 
     A banknote circulation device  1  includes a first tape  100  ( 100   a ,  100   b ) and a second tape  200  ( 200   a ,  200   b ) in the form of long strips, a drum  11  that winds and feeds the first tape  100  and the second tape  200  by rotating in a forward direction and a reverse direction while supporting (fixing) one ends in a longitudinal direction of the first tape  100  and the second tape  200 , a first bobbin  111  ( 111   a ,  111   b ) that feeds and winds the first tape  100  by rotating in a forward direction and a reverse direction while supporting (fixing) the other end in the longitudinal direction of the first tape  100 , and a second bobbin  211  ( 211   a ,  211   b ) that feeds and winds the second tape  200  by rotating in a forward direction and a reverse direction while supporting (fixing) the other end in the longitudinal direction of the second tape  200 . 
     The drum  11  winds the first tape  100   a  and the second tape  200   a  on its outer circumferential surface close to its one axial end while overlapping the tapes on each other in a multilayer state, and also winds the first tape  100   b  and the second tape  200   b  on the outer circumferential surface close to the other axial end while overlapping the tapes on each other in a multilayer state. 
     The first bobbins  111   a  and  111   b  have a first bobbin shaft  113  as a common rotation shaft. The first bobbins  111   a  and  111   b  are spaced away from each other in an axial direction of the first bobbin shaft  113 , and support (fix) the other ends in the longitudinal direction of the first tapes  100   a  and  100   b , respectively. Most of each of the first tapes  100   a  and  100   b  is wound around the corresponding bobbin  111  in an initial state before the first bobbins  111   a  and  111   b  feed the respective tapes. 
     The second bobbins  211   a  and  211   b  have a second bobbin shaft  213  as a common rotation shaft. The second bobbins  211   a  and  211   b  are spaced away from each other in an axial direction of the second bobbin shaft  213 , and support (fix) the other ends in the longitudinal direction of the second tapes  200   a  and  200   b , respectively. Most of each of the second tapes  200   a  and  200   b  is wound around the corresponding bobbin  211  in an initial state before the second bobbins  211   a  and  211   b  feed the respective tapes. 
     The banknote circulation device  1  includes a first guide roller  121  ( 121   a ,  121   b ) and a second guide roller  221  ( 221   a ,  221   b ) that bend the first tape  100  and the second tape  200  respectively fed from the first bobbin  111  and the second bobbin  211  toward the drum  11  and form a banknote slot  40 . The banknote slot  40  receives a banknote M transported from outside between the first tape  100  and the second tape  200  that have joined together to be overlapped on each other (between opposed surfaces), or delivers the received banknote M to outside. 
     The first guide rollers  121   a  and  121   b  are supported by a first guide shaft  123  that is a common rotation shaft, to be rotatable in a forward direction and in a reverse direction integrally with the first guide shaft  123 , and the second guide rollers  221   a  and  221   b  are supported by a second guide shaft  223  that is a common fixed shaft, to be rotatable in a forward direction and in a reverse direction relative to the second guide shaft  223 . 
     A banknote supplied through the banknote slot  40  to between the first tape  100  and the second tape  200  is wound on the drum  11  together with the first tape  100  and the second tape  200  in a multilayer state and are stored. 
     A first idle roller  131  ( 131   a ,  131   b ) and a second idle roller  231  ( 231   a ,  231   b ) are arranged between the first bobbin  111  and the first guide roller  121  and between the second bobbin  211  and the second guide roller  221 , respectively. The first idle roller  131  and the second idle roller  231  respectively guide the first tape  100  and the second tape  200  toward the first and second bobbins  111  and  211  and the first and second guide rollers  121  and  221 . 
     Further, as illustrated in  FIGS.  1  and  2   ( b ), a first assist roller  125  axially supported by the first guide shaft  123  to be rotatable in a forward direction and a reverse direction integrally with the first guide shaft  123  is arranged between the first guide rollers  121   a  and  121   b , and a second assist roller  225  axially supported by the second guide shaft  223  to be rotatable in a forward direction and a reverse direction relative to the second guide shaft  223  is arranged between the second guide rollers  221   a  and  221   b . The first assist roller  125  and the second assist roller  225  configure the banknote slot  40  together with the first guide roller  121  and the second guide roller  221 , and assist transport of a banknote received through the banknote slot  40  to between the first tape  100  and the second tape  200  or transport of a banknote delivered from between the first tape  100  and the second tape  200 . 
     The drum  11  configures a banknote storing unit that stores therein a banknote supplied from outside while sandwiching it between the first tape  100  and the second tape  200  that are overlapped in a multilayer state and are wound on the outer circumference of the drum  11  (between opposed surfaces). 
     When rotating in a banknote-storing direction (a direction of the arrow A 1  in  FIG.  2 ( a ) ), the drum  11  winds the first tape  100  and the second tape  200 , which have sandwiched the banknote supplied from outside through the banknote slot  40  therebetween, on the outer circumference of the drum  11  while overlapping them in a multilayer state, thereby storing the banknote in an outer circumferential portion of the drum  11 . In this rotation, the first bobbin  111  and the second bobbin  211  rotate in a direction of the arrow B 1  and a direction of the arrow C 1  in  FIG.  2 ( a )  to feed the first tape  100  and the second tape  200 , respectively. 
     When rotating in a banknote-dispensing direction (a direction of the arrow A 2  in  FIG.  2 ( a ) ), the drum  11  feeds the first tape  100  and the second tape  200  and also delivers the banknote stored and sandwiched between the first and second tapes  100  and  200  to outside through the banknote slot  40 . In this rotation, the first bobbin  111  and the second bobbin  211  rotate in a direction of the arrow B 2  and a direction of the arrow C 2  in  FIG.  2 ( a )  to wind the first tape  100  and the second tape  200 , respectively. 
     [Driving Mechanism] 
     A configuration of a driving mechanism that achieves the operations of the drum and the bobbins described above is described. 
       FIG.  3    are respectively a schematic diagram illustrating the driving mechanism for the drum and the bobbins, where  FIG.  3 ( a )  is a plan view,  FIG.  3 ( b )  is a front view, and  FIG.  3 ( c )  is a left side view. 
     A driving mechanism  20  includes a driving source (not illustrated), such as a motor, that is included in the drum  11  and causes forward rotation and reverse rotation of the drum  11  in a storing direction in which a banknote is stored (the direction of the arrow A 1 ) and a dispensing direction in which a banknote is dispensed (the direction of the arrow A 2 ), a drum gear  25  connected to a drum shaft  23  that is a rotation shaft of the drum  11  and rotating integrally with the drum  11 , a first idle gear  27  engaging with the drum gear  25 , a second idle gear  31  connected to an idle shaft  29  that is a rotation shaft of the first idle gear  27  integrally with the idle shaft  29 , a first bobbin gear  33  and a second bobbin gear  35  that engage with the second idle gear  31 , and the first bobbin shaft  113  and the second bobbin shaft  213  that are respectively rotation shafts of the first bobbin gear  33  and the second bobbin gear  35 . 
     The first idle gear  27  has a built-in one-way clutch that limits a rotation direction of the idle shaft  29  and the second idle gear  31  to one direction. When the drum  11  and the drum gear  25  rotate in the dispensing direction (the direction of the arrow A 2  in  FIG.  3   ) and the first idle gear  27  rotates in a direction of the arrow D 2 , the one-way clutch causes the idle shaft  29  and the second idle gear  31  to rotate in the direction of the arrow D 2  integrally with the first idle gear  27 . On the other hand, when the drum  11  and the drum gear  25  rotate in the storing direction (the direction of the arrow A 1  in FIGS.  3 ) and the first idle gear  27  rotates in a direction of the arrow D 1 , the one-way clutch causes the idle shaft  29  and the second idle gear  31  to idle with respect to the first idle gear  27 . 
     The first bobbins  111   a  and  111   b  and the first bobbin shaft  113  rotate integrally with each other because of static friction force acting between them in a case where rotation thereof is not limited. In a case where friction force exceeding the maximum static friction force is generated between the first bobbins  111   a  and  111   b  and the first bobbin shaft  113 , the first bobbins  111   a  and  111   b  slip on the first bobbin shaft  113  and rotate relative to the first bobbin shaft  113 . That is, the first bobbin shaft  113  and the first bobbins  111   a  and  111   b  function as a torque limiter. The relation between the second bobbins  211   a  and  211   b  and the second bobbin shaft  213  is also the same as the relation described above. 
     [Operations of Driving Mechanism] 
     Operations of the driving mechanism are as described below. 
     First, an operation in a case where the drum  11  rotates in a dispensing direction is described. When the drum  11  rotates in a dispensing direction (the direction of the arrow A 2 ), the drum shaft  23  and the drum gear  25  rotate in the same direction integrally with each other. This rotation is transmitted to the first idle gear  27  via the drum gear  25 , so that the first idle gear  27  rotates in the direction of the arrow D 2 . The one-way clutch built in the first idle gear  27  transmits the rotation in the direction of the arrow D 2  to the idle shaft  29  and the second idle gear  31 . 
     Rotation of the second idle gear  31  is transmitted to the first bobbin gear  33 , so that the first bobbin gear  33  rotates in the direction of the arrow B 2 . The first bobbin  111  rotates in the direction of the arrow B 2  because of the rotation of the first bobbin gear  33  and the first bobbin shaft  113 . The rotation of the second idle gear  31  is also transmitted to the second bobbin gear  35 , so that the second bobbin gear  35  rotates in the direction of the arrow C 2 . The second bobbin  211  rotates in the direction of the arrow C 2  because of the rotation of the second bobbin gear  35  and the second bobbin shaft  213 . 
     As described above, when the drum  11  rotates in the dispensing direction (the direction of the arrow A 2 ), the drum  11  feeds the first and second tapes  100  and  200 , and the first bobbin  111  and the second bobbin  211  rotate in the direction of the arrow B 2  and the direction of the arrow C 2  to wind the first tape  100  and the second tape  200  fed from the drum  11 , respectively. 
     Gear ratios of the gears included in the driving mechanism  20  are set in such a manner that the length of a tape wound by each of the first bobbin  111  and the second bobbin  211  in unit time is larger than the length of a tape fed by the drum  11  in unit time. Therefore, a predetermined magnitude of tension always acts on the tapes fed from the drum  11 , so that the tapes are respectively wound on the first bobbin  111  and the second bobbin  211  without being slack. 
     If the tension on the tapes becomes larger during winding of the tapes around the first bobbin  111  and the second bobbin  211  and the friction force acting between the first and second bobbins  111  and  211  and the first and second bobbin shafts  113  and  213  exceeds the maximum static friction force, the first and second bobbins  111  and  211  rotate relative to the first and second bobbin shafts  113  and  213 , respectively. Therefore, it is possible to wind the tapes around the first bobbin  111  and the second bobbin  211  without causing the tapes to be slack, while preventing break of the tapes. 
     Subsequently, an operation in a case where the drum  11  rotates in a storing direction is described. When the drum  11  rotates in a storing direction (the direction of the arrow A 1 ), the drum shaft  23  and the drum gear  25  rotate in the same direction integrally with each other. This rotation is transmitted to the first idle gear  27  via the drum gear  25 , so that the first idle gear  27  rotates in the direction of the arrow D 1 . The one-way clutch built in the first idle gear  27  does not transmit the rotation in the direction of the arrow D 1  to the idle shaft  29 . Therefore, the second idle gear  31 , the first bobbin gear  33 , the second bobbin gear  35 , the first bobbin shaft  113 , and the second bobbin shaft  213  that are located downstream of the idle shaft  29  in a power transmitting direction do not rotate. 
     When the drum  11  rotates in the storing direction, the drum  11  winds the tapes while pulling out the tapes from the first bobbin  111  and the second bobbin  211 . Therefore, a predetermined magnitude of tension always acts on the tapes, and the tapes are wound on the drum  11  without being slack. If the tension on the tapes becomes larger during winding of the tapes on the drum  11  and the friction force acting between the first bobbin  111  and the first bobbin shaft  113  and that acting between the second bobbin  211  and the second bobbin shaft  213  exceed the maximum static friction force, the first and second bobbins  111  and  211  rotate relative to the first and second bobbin shafts  113  and  213 , respectively. Therefore, it is possible to wind the tapes on the drum  11  without causing the tapes to be slack, while preventing break of the tapes. 
     Accordingly, when the drum  11  rotates in the storing direction (the direction of the arrow A 1 ), the first bobbin  111  and the second bobbin  211  rotate in a direction of feeding respective tapes (the direction of the arrow B 1  and the direction of the arrow C 1 ) because of tension acting on the respective tapes during winding of the first tape  100  and the second tape  200  by the drum  11 . 
     As described above, the driving mechanism  20  operates in such a manner that the amount of a tape wound by each of the first and second bobbins  111  and  211  is more than the amount of a tape fed from the drum  11  when the drum  11  rotates in a dispensing direction, and the amount of a tape fed from each of the first and second bobbins  111  and  211  is less than the amount of a tape wound by the drum  11  when the drum  11  rotates in a storing direction, thereby preventing the tapes from being slack. 
     [Basic Configuration of Tape] 
     Returning to  FIGS.  1  and  2   , each of the first and second tapes  100  and  200  is made of a resin film material that is soft and flexible and has low elasticity. The first tape  100   b  and the second tapes  200   a  and  200   b  are formed by a transparent tape that allows visible light, for example, to pass therethrough, over the entire length in the longitudinal direction. The first tape  100   a  is formed by an identical material to the first tape  100   b  and the second tape  200 , but is different from the above tapes  100   b  and  200  in that detection marks (a travelling-direction mark  310  and a trailing end mark  301 ) are formed at both ends in the longitudinal direction. 
     A detailed configuration of the first tape  100   a  as a detection tape provided with detection marks will be described later. 
     [Sensor Module] 
     A sensor module (a mark detection sensor)  50  that detects detection marks added on the first tape  100   a  is arranged at an appropriate position in the banknote circulation device  1 , the position facing the first tape  100   a , as illustrated in  FIGS.  1  and  2   . 
     The sensor module  50  described in the present embodiment is a through-beam type photoelectric sensor module configured to include a light-emitting unit  51  and a light-receiving substrate  57 . The light-emitting unit  51  includes a light-emitting element (for example, an LED or a laser diode) that radiates detecting light to the first tape  100   a . The light-receiving substrate  57  includes, for example, a light-receiving element (a photoelectric conversion element, a light receiving unit  53 ) that receives the detecting light, and a processing circuit including an A/D converter that converts an analog detection signal output from the light-receiving element into a digital detection signal. The light-emitting unit  51  and the light-receiving substrate  57  are arranged to be opposed to each other while sandwiching therebetween the first tape  100   a  that is not overlapped. The sensor module  50  outputs a detection signal having a level (an intensity) corresponding to optical characteristics of the first tape  100   a.    
     [Detection Tape] 
       FIG.  4    is a schematic diagram illustrating a state of supporting a tape by a drum and bobbins. 
     The first tapes  100   a  and  100   b  are supported by the drum  11  at one ends in the longitudinal direction (leading ends) and by the first bobbins  111   a  and  111   b  at the other ends in the longitudinal direction (trailing ends). In the following descriptions, the first tape  100   a  is referred to as “detection tape  300 ”. 
     The detection tape  300  has the travelling-direction mark  310  (a travelling-direction detection region) for indicating a travelling-direction at one end in the longitudinal direction. The detection tape  300  also has the trailing end mark  301  (a trailing-end detection region) for indicating a trailing end at the other end in the longitudinal direction. Further, an intermediate portion in the longitudinal direction of the detection tape  300  is a non-detection region  303  that is not detected by the sensor module  50 , and is a transparent region that allows detecting light of the sensor module  50  to pass therethrough in this example. 
     The travelling-direction mark  310  is formed by a pattern in which a transparent region that allows detecting light to pass therethrough and a light-shielding region that shields the detecting light appear alternately and regularly. The trailing end mark  301  is formed only by a light-shielding region that shields the detecting light. 
     &lt;Travelling-Direction Mark&gt; 
       FIG.  5    is a schematic diagram illustrating an example of a travelling-direction mark. 
     The travelling-direction mark  310  has a plurality of sets of regular patterns  311  that are formed along a travelling-direction of the detection tape  300  and indicate the difference of the travelling-direction of the detection tape  300 . The travelling-direction mark  310  is configured in such a manner that a temporal change of a detection signal output from the sensor module  50  (a pattern signal) is different between when the detection tape  300  travels in a storing direction (a direction of the arrow E 1  in  FIG.  5   ) in which the detection tape  300  is wound on the drum  11  (see  FIG.  4   ) and when the detection tape  300  travels in a dispensing direction (a direction of the arrow E 2  in FIG.  5 ) in which the detection tape  300  is fed from the drum  11 . 
     The travelling-direction mark  310  has a plurality of patterns  311  that are continuously repeated along a longitudinal direction. Each pattern  311  includes at least three types of light-shielding regions  311   a ,  311   b , and  311   c  as constituent elements, which are arranged along the longitudinal direction and are different from one another in the state of the detection signal output from the sensor module  50  (an output pattern of the detection signal). The pattern  311  described in this example is configured to include the three light-shielding regions  311   a ,  311   b , and  311   c  that are different from one another in the length in the longitudinal direction. The relative lengths in the longitudinal direction of the light-spieling regions  311   a ,  311   b , and  311   c  are short, medium, and long. Transparent regions  312  that are the same in the length in the longitudinal direction are arranged between the light-shielding regions  311   a ,  311   b , and  311   c.    
     When the detection tape  300  travels in the storing direction (the direction of the arrow E 1  in  FIG.  5   ), the sensor module  50  detects the travelling-direction mark  310  in the order of the light-shielding regions  311   a ,  311   b ,  311   c ,  311   a ,  311   b ,  311   c , . . . . On the other hand, when the detection tape  300  travels in the dispensing direction from the drum (the direction of the arrow E 2  in  FIG.  5   ), the sensor module  50  detects the travelling-direction mark  310  in the order of the light-shielding regions  311   c ,  311   b ,  311   a ,  311   c ,  311   b ,  311   a, . . . .    
     In this manner, the travelling-direction mark  310  is arranged in such a manner that the arranging order of the lengths of light-shielding regions in a case where the detection tape  300  is wound on the drum  11  and that in a case where the detection tape  300  is fed from the drum  11  are asymmetric. That is, each pattern  311  is formed so that two types of pattern signals that are different are output in accordance with the travelling-direction. 
     [Winding Direction of Tape on Drum] 
     When a banknote jam occurs inside the banknote circulation device  1 , an operator may manually rotate the drum  11  in a banknote-dispensing direction to remove the jammed banknote. However, if the operator excessively rotates the drum  11  in a state where the remaining amount of the tape wound on the drum  11  is low, the remaining tape may be all fed from the drum  11  and rotation in the same direction continued thereafter may cause the tape to be wound on the drum  11  in a direction opposite to a proper winding direction. 
       FIG.  6    are respectively a schematic diagram for explaining a relation between a winding direction of a tape on a drum and a travelling-direction of the tape, where  FIG.  6 ( a )  illustrates a normal state and  FIG.  6 ( b )  illustrates a reverse-winding state. In  FIG.  6   , a case where the drum  11  rotates in a banknote-dispensing direction (the direction of the arrow A 2  in  FIG.  6   ) is described by way of example. 
     In the normal state illustrated in  FIG.  6 ( a ) , the first tape  100  and the second tape  200  are wound on the drum  11  without being largely curved from the banknote slot  40 . When the drum  11  rotates in the direction of the arrow A 2  that is the dispensing direction in the normal state, the detection tape  300  travels in the direction of the arrow E 2 . 
     In the reverse-winding state illustrated in  FIG.  6 ( b ) , the first tape  100  and the second tape  200  are wound on a circumferential surface of the drum  11  after being largely curved in an S-shape from the banknote slot  40 . Because a banknote is sharply curved on the drum  11  side of the banknote slot  40 , the banknote cannot be stored and delivered smoothly, which may cause a banknote jam or a failure of the banknote circulation device  1 . In a case where the winding direction of the tape is a reverse direction, when the drum  11  rotates in the direction of the arrow A 2  that is the dispensing direction, the detection tape  300  travels in the direction of the arrow E 1  opposite to the arrow E 2  that is a transport direction in the normal state. 
     As described above, in the state where reverse winding occurs, despite the rotation of the drum  11  in the dispensing direction, the detection tape  300  travels in the storing direction, that is, a reverse direction to the direction in the normal state. Therefore, if a rotation direction of the drum  11  and a travelling-direction of the detection tape  300  are found, it is possible to determine whether the first tape  100  and the second tape  200  are wound on the drum  11  in a proper direction. 
     [Functional Block Diagram] 
       FIG.  7    is a functional block diagram illustrating a schematic configuration of a control unit and its periphery of a banknote circulation device. 
     The banknote circulation device  1  includes the sensor module  50 , a control unit  60 , a drive circuit  71 , and a motor  73 . 
     The sensor module  50  includes the light-emitting unit  51 , the light-receiving unit  53 , and an A/D converter  55  as described with reference to  FIGS.  1  and  2   , and detects the travelling-direction mark  310  (see  FIGS.  4  to  6   ) and outputs a digital detection signal. The A/D converter may be arranged in the control unit  60  instead of in the sensor module  50 . 
     The control unit  60  determines a winding direction of a tape on the drum  11  on the basis of the digital detection signal input from the sensor module  50 , and generates a driving signal. 
     The control unit  60  includes a pattern acquisition unit (pattern acquisition unit)  61 , a reference-pattern storing unit (reference-pattern storing unit)  63 , a travelling-direction determination unit (travelling-direction determination unit)  65 , a winding-direction determination unit (winding-direction determination unit)  67 , and a drive control unit  69 . 
     The control unit  60  is constituted of a microcomputer or the like including, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an input/output interface. The CPU, the ROM, the RAM, and the input/output interface are connected to each other through a bus. 
     The CPU is a processor that controls each unit of a banknote circulation device. The ROM is a non-volatile memory unit that stores therein a program and data used for processing. The RAM is a volatile memory unit used by the CPU as a working memory area. The CPU loads and executes the program stored in the ROM on the RAM to implement the functions of the control unit  60  illustrated in  FIG.  7   . The input/output interface is a unit that transmits a signal to and receives a signal from an external device, and inputs a digital detection signal from the sensor module  50  and outputs a driving signal to the drive circuit  71 . 
     The pattern acquisition unit  61  acquires (generates) a pattern signal in accordance with a travelling-direction of a detection tape on the basis of a temporal change of the digital detection signal. For example, the pattern acquisition unit  61  acquires a pattern signal corresponding to the pattern  311  illustrated in  FIG.  5   . 
     The reference-pattern storing unit  63  is a unit that stores therein a reference pattern to be compared with the pattern signal. 
     The travelling-direction determination unit  65  compares the reference pattern read from the reference-pattern storing unit  63  and the pattern signal output from the pattern acquisition unit  61  with each other to determine which one of a storing direction and a dispensing direction the detection tape travels in. 
     The winding-direction determination unit  67  is a unit that determines whether the winding direction of a tape on the drum  11  is a forward direction or a reverse direction on the basis of information on the travelling-direction of the tape determined by the travelling-direction determination unit  65  (travelling-direction data) and information on a rotation direction of the motor  73  driven and controlled by the drive control unit  69  (rotation-direction data). 
     The drive control unit  69  is a unit that generates and outputs a driving signal for controlling the drive circuit  71  that causes the motor  73  to rotate. In a case where the winding direction of the tape determined by the winding-direction determination unit  67  is a reverse direction, the drive control unit  69  generates a driving signal that causes the motor  73  to be stopped once and then rotate in an opposite direction. The drive control unit  69  also provides the information on the rotation direction of the motor  73  (the rotation-direction data) to the winding-direction determination unit  67 . 
     The drive circuit  71  drives the motor  73  that causes the drum  11  to rotate in a forward direction and a reverse direction, on the basis of a driving signal from the control unit  60 . 
     [Summary of Processing] 
       FIG.  8    is a flowchart for explaining an operation of a control unit. 
     At step S 1 , the drive control unit  69  generates a driving signal that causes the motor  73  to rotate in a predetermined rotation direction (a storing direction or a dispensing direction) and outputs the driving signal to the drive circuit  71 . The motor  73  is driven to rotate on the basis of the driving signal, so that the detection tape  300  travels. The light-emitting unit  51  of the sensor module  50  radiates detecting light to the detection tape  300 . When the detection tape  300  travels, the travelling-direction mark  310  is detected by the sensor module  50 . The light-receiving unit  53  of the sensor module  50  outputs an analog detection signal having an intensity in accordance with the surface state of the detection tape  300 . The A/D converter  55  converts the analog detection signal to a digital detection signal and outputs the digital detection signal to the control unit  60 . 
     At step S 3 , the pattern acquisition unit  61  inputs the digital detection signal thereto, and acquires a pattern signal corresponding to a pattern of the travelling-direction mark from the digital detection signal that varies with time. For example, the pattern acquisition unit  61  recognizes a series of signals containing one detection signal corresponding to each of the three light-shielding regions  311   a  to  311   c , regarding a detection signal having a level corresponding to any of the light-shielding regions  311   a  to  311   c  that is detected immediately after the transparent region  312  illustrated in  FIG.  5    as a starting point, and generates the recognized series of signals as a pattern signal. 
     At step S 5 , the travelling-direction determination unit  65  compares a reference pattern read from the reference-pattern storing unit  63  and the pattern signal with each other to determine which one of a storing direction and a dispensing direction the detection tape  300  travels in. Here, information indicating travelling-directions of the detection tape  300  is made to correspond to respective reference patterns stored in the reference-pattern storing unit  63 . The travelling-direction determination unit  65  extracts a reference pattern that matches the pattern signal, and determines a travelling-direction made to correspond to this reference pattern as an actual travelling-direction of the detection tape  300 . The travelling-direction determination unit  65  also outputs information on the travelling-direction of the detection tape  300  (the travelling-direction data) to the winding-direction determination unit  67 . 
     At step S 7 , the winding-direction determination unit  67  determines whether the winding direction of the first and second tapes  100  and  200  on the drum  11  is a forward direction or a reverse direction on the basis of the information on the travelling-direction of the detection tape  300  acquired from the travelling-direction determination unit  65  and information on the rotation direction of the drum  11  acquired from the drive control unit  69 . 
     Here, the phrase that the winding direction of the first and second tapes  100  and  200  is the forward direction means that the first and second tapes  100  and  200  travel in the storing direction (or the dispensing direction) and the drum  11  rotates in the storing direction in which a banknote is stored normally (or a dispensing direction in which a banknote is dispensed normally, a proper direction). Further, the phrase that the winding direction of the first and second tapes  100  and  200  is the reverse direction means that the first and second tapes  100  and  200  travel in the storing direction and the drum  11  rotates in the dispensing direction in which a banknote is dispensed normally (a non-normal direction). 
     In a case where the winding direction of the first and second tapes  100  and  200  on the drum  11  is the forward direction (Yes at step S 7 ), the control unit  60  ends processing. In a case where the winding direction of the first and second tapes  100  and  200  on the drum  11  is the reverse direction (No at step S 7 ), processes at step S 9  and thereafter are performed. 
     At step S 9 , the drive control unit  69  controls the drive circuit  71  to stop driving the motor  73 . That is, the drive control unit  69  generates a driving signal that temporarily stops driving the motor  73 , and outputs it to the drive circuit  71 . 
     At step S 11 , the drive control unit  69  performs an operation for correcting the winding direction of the first and second tapes  100  and  200 . First, the drive control unit  69  controls the drive circuit  71  to cause the motor  73  to rotate in an opposite direction. That is, the drive control unit  69  generates a driving signal that causes the motor  73  to rotate in the storing direction, and outputs it to the drive circuit  71 . 
     Further, as described with reference to  FIG.  3   , in the present embodiment in which the driving mechanism  20  is provided which uses gear ratios, a one-way clutch, and a torque limiter function for adjusting tension of the tapes  100  and  200 , the bobbins  111  and  211  do not rotate in the directions of the arrows B 2  and C 2 , respectively, even if the drum  11  is caused to rotate in the direction of the arrow A 1  in  FIG.  6    to eliminate reverse winding of the tapes  100  and  200 . Consequently, the tapes  100  and  200  are slack. Therefore, the drive control unit  69  alternately executes control of causing the drum  11  to rotate in the direction of the arrow A 1  and control of causing the drum  11  to rotate in the direction of the arrow A 2 . In this case, the drive control unit  69  generates a driving signal to satisfy “time in which drum  11  is caused to rotate in direction of arrow A 2 ”&lt;“time in which drum  11  is caused to rotate in direction of arrow A 1 ”, and outputs the driving signal to the drive circuit  71 . 
     After performing the process at step S 11 , the control unit  60  performs the processes at step S 3  and thereafter, confirms that the winding direction of the first and second tapes  100  and  200  on the drum  11  is normal at step S 7 , and ends processing. 
     Advantageous Effects of Present Embodiment 
     As described above, according to the present embodiment, different marks are added at a leading end and a trailing end of the detection tape  300 . Therefore, by causing the detection tape  300  to travel, it is possible to determine a position in the longitudinal direction on the detection tape  300  (the leading end, an intermediate portion, or the trailing end) only by including one sensor module  50  (a detection sensor). According to the present embodiment, it is unnecessary to provide a plurality of sensors unlike Patent Literature 1. Therefore, miniaturization and space saving of the banknote circulation device  1  can be achieved. 
     According to the present embodiment, the travelling-direction mark  310  indicating the difference of the travelling-direction is added on the detection tape  300 . Therefore, it is possible to determine which one of a dispensing direction in which a banknote is dispensed and a storing direction in which a banknote is stored the detection tape  300  travels in. 
     According to the present embodiment, it is possible to determine whether the detection tape  300  is wound on the drum  11  in a proper direction or a reverse direction on the basis of information on a travelling-direction of the detection tape  300  and information on a rotation direction of the drum  11  that winds the detection tape  300  thereon. If the detection tape  300  is wound in the reverse direction, it is possible to automatically rewind the detection tape  300  in the proper direction by stopping rotation of the drum  11  and driving the drum  11  to rotate in the reverse direction, so that a failure or the like of the banknote circulation device  1  can be prevented in advance. 
     Although a through-beam type photoelectric sensor is used as a sensor module in this example, the banknote circulation device  1  uses a sensor that can detect each of the travelling-direction mark  310  and the trailing end mark  301  added on the detection tape  300  in accordance with physical properties of each mark. As the sensor, it is possible to use various sensors, for example, a photoelectric sensor that detects the difference of a transmittance, a reflectance, or a color as an optical property of each mark, an image sensor that captures an image of each mark (a line sensor or an area sensor), and a magnetic sensor that detects the difference of a magnetic property between marks. Each mark may be visible by human eyes or not visible. 
     Further, the information on the rotation direction of the drum  11  may be acquired via a rotary encoder attached to the drum  11 , for example, other than the drive control unit  69 . 
     Furthermore, the banknote circulation device  1  may include a notification unit (such as a speaker, a lamp, or a display device such as a liquid crystal display panel) that notifies, when the winding direction of the detection tape  300  on the drum  11  is determined as a reverse direction, outside of that determination by sound, light, an indication using characters and pictures, and the like. 
     [Modifications of Travelling-Direction Mark] 
       FIGS.  9 ( a ) to  9 ( d )  are schematic diagrams respectively illustrating a modification of a travelling-direction mark. 
     As illustrated in  FIG.  9 ( a ) , the travelling-direction mark  310  includes a plurality of patterns  313  each of which has a regular arrangement of three constituent elements  313   a ,  313   b , and  313   c  that are different from one another in a transmittance of detecting light and are arranged along the longitudinal direction in a predetermined order. For example, the transmittance of detecting light is 0% in the constituent element  313   a,  50% in the constituent element  313   b , and approximately 100% in the constituent element  313   c . The lengths in the longitudinal direction of the constituent elements  313   a ,  313   b , and  313   c  described in this modification are the same as one another, but may be different from one another. 
     The constituent elements  313   a  to  313   c  are detected in the order of the constituent elements  313   a ,  313   b , and  313   c  by the sensor module  50  when the detection tape  300  travels in the storing direction (the direction of the arrow E 1 ), and are detected in the order of the constituent elements  313   c ,  313   b , and  313   a  by the sensor module  50  when the detection tape  300  travels in the dispensing direction (the direction of the arrow E 2 ). 
     Also in this modification, the travelling-direction mark  310  is arranged in such a manner that the detection order of the constituent elements  313   c ,  313   b , and  313   a  is asymmetric in accordance with the travelling-direction of the detection tape  300 . Therefore, the banknote circulation device  1  can detect the travelling-direction of the detection tape  300 . 
     As illustrated in  FIG.  9 ( b ) , the travelling-direction mark  310  includes a plurality of patterns  315  each of which has a configuration in which three different designs (constituent elements)  315   a ,  315   b , and  315   c  are arranged along the longitudinal direction in a predetermined order. The designs  315   a ,  315   b , and  315   c  in this modification can be detected by using the sensor module  50  configured by a line image sensor including a plurality of photoelectric conversion elements arranged along a short-side direction of the detection tape  300 , an area image sensor (a camera) that can capture an image of a predetermined area range in the detection tape  300 , or the like. 
     The designs  315   a  to  315   c  of the travelling-direction mark  310  are detected in the order of the designs  315   a ,  315   b , and  315   c  by the sensor module  50  when the detection tape  300  travels in the storing direction (the direction of the arrow E 1 ), and are detected in the order of the designs  315   c ,  315   b , and  315   a  by the sensor module  50  when the detection tape  300  travels in the dispensing direction (the direction of the arrow E 2 ). 
     Also in this modification, the travelling-direction mark  310  is arranged in such a manner that the detection order of the designs  315   c ,  315   b , and  315   a  is asymmetric in accordance with the travelling-direction of the detection tape  300 . Therefore, the banknote circulation device  1  can detect the travelling-direction of the detection tape  300 . 
     As illustrated in  FIG.  9 ( c ) , the travelling-direction mark  310  is configured by patterns  317 ,  317 , . . . , whose position in the short-side direction (whose appearing position in the short-side direction) continuously changes in accordance with a change of a position in the longitudinal direction on the detection tape  300 . The pattern  317  is a pattern whose position detected by the sensor module  50  changes along the short-side direction. The travelling-direction mark  310  may include only one pattern  317  or a plurality of patterns  317 . 
     The patterns  317  of this modification can be detected by the sensor module  50  configured by a line image sensor including a plurality of photoelectric conversion elements arranged along the short-side direction of the detection tape  300 , an area image sensor (a camera) that can capture an image of a predetermined area range in the detection tape  300 , or the like. 
     The pattern  317  is detected by the sensor module  50  as a design that continuously moves from one end in the short-side direction (a lower side in  FIG.  9 ( c ) ) to the other end (an upper side in  FIG.  9 ( c ) ) when the detection tape  300  travels in the storing direction (the direction of the arrow E 1 ), and is detected by the sensor module  50  as a design that continuously moves from the other end in the short-side direction to the one end when the detection tape  300  travels in the dispensing direction (the direction of the arrow E 2 ). 
     Also in this modification, the travelling-direction mark  310  is arranged in such a manner that the detected position (the appearing position) of the pattern  317  in the short-side direction of the detection tape  300  and the moving direction (the changing direction) of the pattern  317  are asymmetric in accordance with the travelling-direction of the detection tape  300 . Therefore, the banknote circulation device  1  can detect the travelling-direction of the detection tape  300 . 
     As illustrated in  FIG.  9 ( d ) , the travelling-direction mark  310  includes patterns  319 ,  319 , . . . , whose length in the short-side direction (and whose position in the short-side direction or whose appearing position in the short-side direction) continuously changes in accordance with a change of a position in the longitudinal direction on the detection tape  300 . The travelling-direction mark  310  may include only one pattern  319  or a plurality of patterns  319 . 
     The patterns  319  of this modification can be detected by the sensor module  50  configured by a line image sensor including a plurality of photoelectric conversion elements arranged along the short-side direction of the detection tape  300 , an area image sensor (a camera) that can capture an image of a predetermined area range in the detection tape  300 , or the like. 
     The pattern  319  is detected by the sensor module  50  as a design whose length in the short-side direction continuously changes to decrease when the detection tape  300  travels in the storing direction (the direction of the arrow E 1 ), and is detected by the sensor module  50  as a design whose length in the short-side direction continuously changes to increase when the detection tape  300  travels in the dispensing direction (the direction of the arrow E 2 ). 
     Also in this modification, the travelling-direction mark  310  is arranged in such a manner that the changing direction of the length in the short-side direction of the pattern  319  is asymmetric in accordance with the travelling-direction of the detection tape  300 . Therefore, the banknote circulation device  1  can detect the travelling-direction of the detection tape  300 . 
     [Banknote Handling Device] 
       FIG.  10    is an explanatory diagram of a schematic configuration of a circulation-type banknote processing device as an example of a banknote handling device to which the banknote circulation device according to the embodiment of the present invention is applied. 
     A circulation-type banknote processing device (a paper sheet handling device)  400  generally includes, for example, a housing  403  having a banknote depositing/dispensing port  401  in its front side, a depositing/dispensing path  405 , a back transport path  407 , a circulation path  409 , and a non-circulation path  411  that are arranged in the housing  403 , a banknote recognition unit  413  that determines, for example, whether a banknote introduced from the banknote depositing/dispensing port  401  has a missing part, determines the denomination of the introduced banknote, and determines whether the introduced banknote is genuine, the banknote circulation devices  1  and  1  each of which receives a banknote introduced from the circulation path  409  by denomination, a non-circulation banknote repository  415  that stores therein a banknote introduced from the non-circulation path  411 , a transport driving mechanism that is configured by a roller, a belt, a motor, and the like and transports a banknote along the depositing/dispensing path  405 , the back transport path  407 , the circulation path  409 , and the non-circulation path  411 , and the control unit  60  that controls the constituent elements described above. 
     A banknote received from the banknote depositing/dispensing port  401  one by one is transported to the banknote recognition unit  413  via the depositing/dispensing path  405 . If the banknote recognition unit  413  determines that the banknote introduced from the banknote depositing/dispensing port  401  is not acceptable, the control unit  60  controls the transport driving mechanism to return this banknote through the banknote depositing/dispensing port  401 . If the banknote recognition unit  413  determines that the banknote introduced from the banknote depositing/dispensing port  401  is acceptable and genuine, the control unit  60  controls the transport driving mechanism to sort this banknote to any of the banknote circulation devices  1  and  1  or to the non-circulation banknote repository  415  by denomination. When a dispense instruction for a specified denomination is received, the control unit  60  delivers a banknote of that denomination from a corresponding one of the banknote circulation devices  1  and  1  and controls the transport driving mechanism to transport this banknote to the banknote depositing/dispensing port  401  via the back transport path  407  and the depositing/dispensing path  405 . 
     The circulation-type banknote processing device  400  can also operate to perform switch-back transport of a banknote delivered from each of the banknote circulation devices  1  and  1  and to store it in the non-circulation banknote repository  415 . 
     It is possible to apply the banknote circulation device described in the embodiment described above to various types of vending machines, money changers, cash dispensers, and other various types of money handling devices. Further, the banknote circulation device is not limited to a device that handles banknotes, and may be a device that handles securities, tickets, ballots, envelopes, or various types of other paper sheets. 
     Summary of Examples of Modes, Actions, and Advantageous Effects of Present Invention 
     &lt;First Mode&gt; 
     The present mode is a paper sheet circulation device (the banknote circulation device  1 ) that includes a tape in the form of a long strip (the first tape  100 , the second tape  200 ), the drum  11  that supports one end in a longitudinal direction of the tape and winds and feeds the tape by rotating in a forward direction and a reverse direction, and a bobbin (the first bobbin  111 , the second bobbin  211 ) that supports the other end in the longitudinal direction of the tape and feeds and winds the tape by rotating in a forward direction and a reverse direction, the paper sheet circulation device retaining a paper sheet (the banknote M) supplied from outside by sandwiching it between the tapes and winding the paper sheet and the tapes in a multilayer state on an outer circumference of the drum. The paper sheet circulation device is characterized by including the travelling-direction mark  310  that has a pattern  311  formed along a travelling-direction of the tape (the first tape  100   a , the detection tape  300 ) to indicate the difference of the travelling-direction of the tape, a mark detection sensor (the sensor module  50 ) that detects the travelling-direction mark and outputs a detection signal, a pattern acquisition unit (the pattern acquisition unit  61 ) that acquires a pattern signal in accordance with the travelling-direction of the tape on the basis of a temporal change of the detection signal, and a travelling-direction determination unit (the travelling-direction determination unit  65 ) that determines the travelling-direction of the tape from the pattern signal. 
     In the present mode, because the travelling-direction mark having the pattern that indicates the difference of the travelling-direction is added on the tape, it is possible to determine, on the basis of a signal acquired from the travelling-direction mark (the pattern signal), which one of a dispensing direction in which the paper sheet is dispensed and a storing direction in which the paper sheet is stored the tape travels in. 
     By using information on the travelling-direction of the tape, it is possible to determine whether a winding direction of the tape on the drum is normal. More specifically, in a case where the tape travels in a dispensing direction (or a storing direction) and the drum rotates in a direction in which the paper sheet is dispensed (or is stored) normally, the winding direction of the tape on the drum can be determined as being normal. On the other hand, in a case where the drum rotates in a direction in which the paper sheet is dispensed normally although the tape travels in the storing direction, the winding direction of the tape on the drum can be determined as being reverse. 
     As described above, according to the present mode, it is possible to obtain information on the travelling-direction of a tape required for determination of a winding direction of the tape on a drum. Therefore, by using this information, it is possible to prevent, in advance, a failure or the like of a device caused by winding of the tape on the drum in a wrong direction. 
     &lt;Second Mode&gt; 
     A paper sheet circulation device according to the present mode (the banknote circulation device  1 ) is characterized by including a winding-direction determination unit (the winding-direction determination unit  67 ) that determines whether the winding direction of the tape on the drum is normal or abnormal from a travelling-direction of the tape (the detection tape  300 ) and a rotation direction of the drum. 
     From information on the travelling-direction of the tape and information on the rotation direction of the drum, it is possible to determine the winding direction of the tape on the drum by the winding-direction determination unit. If the tape is wound on the drum in a reverse direction, it is possible to perform an operation of preventing a failure of a device in advance, such as an operation of stopping rotation of the drum once and then causing the drum to rotate in the reverse direction to make the winding direction of the tape on the drum normal. 
     &lt;Third Mode&gt; 
     A paper sheet circulation device according to the present mode (the banknote circulation device  1 ) is characterized in that the travelling-direction mark  310  has the pattern  311  that includes at least three types of constituent elements (the light-shielding regions  311   a  to  311   c ) that are arranged along a longitudinal direction of the tape (the detection tape  300 ) and are different from one another in an output pattern of a detection signal. 
     If the travelling-direction mark includes at least three types of constituent elements, the detection order of the constituent elements can be changed in accordance with the travelling-direction of the tape and it is therefore possible to determine the travelling-direction of the tape. 
     &lt;Fourth Mode&gt; 
     A paper sheet circulation device according to the present mode (the banknote circulation device  1 ) is characterized in that the travelling-direction mark  310  includes the pattern  317  whose position detected by the mark detection sensor (the sensor module  50 ) changes in the short-side direction. 
     Also in a case where the detection position of the pattern configuring the travelling-direction mark changes in the short-side direction, the detection position of the pattern in the short-side direction and a changing direction of that detection position can be made asymmetric in accordance with the travelling-direction of the detection tape. Therefore, it is possible to detect the travelling-direction of the detection tape. 
     &lt;Fifth Mode&gt; 
     A paper sheet circulation device according to the present mode (the banknote circulation device  1 ) is characterized in that the travelling-direction mark  310  is added at one end in the longitudinal direction of the tape (the detection tape  300 ). 
     By providing the travelling-direction mark at one end in the longitudinal direction of the tape, that is, at an end supported by the drum  11 , it is possible to determine the winding direction in an initial phase where the tape starts to be wound on the drum, and it is easy to rewind the tape on the drum. 
     &lt;Sixth Mode&gt; 
     A paper sheet handling device according to the present mode (the circulation-type banknote processing device  400 ) is characterized by including the paper sheet circulation device (the banknote circulation device  1 ). 
     The present mode can provide a paper sheet handling device having the effects of the modes described above. 
     REFERENCE SIGNS LIST 
       1  . . . banknote circulation device,  11  . . . drum,  20  . . . driving mechanism,  23  . . . drum shaft,  25  . . . drum gear,  27  . . . first idle gear,  29  . . . idle shaft,  31  . . . second idle gear,  33  . . . first bobbin gear,  35  . . . second bobbin gear,  40  . . . banknote slot,  50  . . . sensor module,  51  . . . light-emitting unit,  53  . . . light-receiving unit,  55  . . . A/D converter,  57  . . . light-receiving substrate,  60  . . . control unit,  61  . . . pattern acquisition unit,  63  . . . reference-pattern storing unit,  65  . . . travelling-direction determination unit,  67  . . . winding-direction determination unit,  69  . . . drive control unit,  71  . . . drive circuit,  73  . . . motor,  100 , 100   a , 100   b  . . . first tape,  111 , 111   a , 111   b  . . . first bobbin,  113  . . . first bobbin shaft,  121 , 121   a , 121   b  . . . first guide roller,  123  . . . first guide shaft,  125  . . . first assist roller,  131  . . . first idle roller,  200 , 200   a , 200   b  . . . second tape,  211 , 211   a , 211   b  . . . second bobbin,  213  . . . second bobbin shaft,  221 , 221   a , 221   b  . . . second guide roller,  223  . . . second guide shaft,  225  . . . second assist roller,  231  . . . second idle roller,  300  . . . detection tape,  301  . . . trailing end mark,  303  . . . non-detection region,  310  . . . travelling-direction mark,  311  . . . pattern,  311   a , 311   b , 311   c  . . . light-shielding region,  312  . . . transparent region,  313  . . . pattern,  313   a ,  313   b ,  313   c  . . . pattern,  315  . . . pattern,  315   a , 315   b , 315   c  . . . pattern,  317  . . . pattern,  319  . . . pattern,  400  . . . circulation-type banknote processing device,  401  . . . banknote depositing/dispensing port,  403  . . . housing,  405  . . . depositing/dispensing path,  407  . . . back transport path,  409  . . . circulation path,  411  . . . non-circulation path,  413  . . . banknote recognition unit,  415  . . . non-circulation banknote repository, M . . . banknote