Abstract:
Provided is a paper-currency transfer device, which prevents paper-currency clogging in a paper-currency transfer unit composed of a plurality of transfer units and which neither has a complicated structure nor needs a dedicated drive source. A medium transfer device transfers a medium from a sending-side paper-currency transfer passage as a first transfer passage to a receiving-side paper-currency transfer passage as a second transfer passage. The medium transfer device comprises a runner mounted coaxially with a transfer roller on a receiving side of the receiving-side paper-currency transfer passage. The runner is rotated at a higher speed than that of the transfer roller on the receiving side. The drive source of the runner is common to that of the transfer roller.

Description:
TECHNICAL FIELD 
     The present invention relates to a medium transfer device of an automatic paper currency deposit/withdrawal machine installed in financial institutions and the like and receiving and paying paper currency. 
     BACKGROUND ART 
     The conventional automatic paper currency deposit/withdrawal machine performs money withdrawal processing of currency, such as paper currency, from an internal safe by customer&#39;s operation and money deposit processing of storing, in the internal safe, paper currency and the like received from a customer. In the money withdrawal processing, paper currency is transferred from the internal safe to a customer section through a paper currency transfer section. In the money deposit processing, paper currency is transferred from the customer section to the internal safe through the paper currency transfer section. 
       FIGS. 8A and 8B  are side views schematically showing a paper currency transfer section of the conventional automatic paper currency deposit/withdrawal machine.  FIG. 8A  is a side view schematically showing a transfer unit of the paper currency transfer section. A paper currency transfer passage  80  includes transfer rollers  82   a ,  82   b ,  83   a , and  83   b  and transfer belts  84   a  and  84   b . The upper transfer belt  84   a  is stretched between the transfer rollers  82   a  and  83   a  and rotated in the arrow direction by a drive source (not shown). As with the upper transfer belt  84   a , the lower transfer belt  84   b  is stretched between the transfer rollers  82   b  and  83   b  and rotated in the arrow direction by a drive source (not shown). The upper and lower transfer belts  84   a  and  84   b  rotate while interposing paper currency P in between to thereby transfer the paper currency P in the arrow direction. 
       FIG. 8B  is a side view showing delivery between transfer units of the paper currency transfer section. A sending-side paper currency transfer passage  81  shown in  FIG. 8B  and a receiving-side paper currency transfer passage  91  having the same constitution as that of the sending-side paper currency transfer passage  81  are provided respectively on the upstream side and the downstream side in the transfer direction of the paper currency P. A delivery section for delivering the paper currency P is constituted between a transfer unit as the sending-side paper currency transfer passage  81  and a transfer unit as the receiving-side paper currency transfer passage  91 . Those transfer units and the delivery section are continuously constituted between constitutive units such as the customer section and the internal safe in the automatic paper currency deposit/withdrawal machine to constitute the paper currency transfer section. In the paper currency transfer section, the paper currency P is sent out from the sending-side paper currency transfer passage  81  to be received in the receiving-side paper currency transfer passage  91 , and, thus, to be transferred between each of the transfer units from the upstream to the downstream in the transfer direction. 
     The transferred paper currency P has no rigidity and is thin and soft. Since, in particular, paper currency to be received is used under various conditions, many of the paper currencies may be deformed.  FIGS. 9A ,  9 B, and  9 C are explanatory view showing a transfer state of paper currency in the conventional paper currency transfer section.  FIG. 9A  is an explanatory view showing the paper currency P with a bent and deformed front end P- 1 .  FIG. 9B  is an explanatory view showing the paper currency P generally curved including the front end P- 1 . As shown in  FIGS. 9A and 9B , when the paper currency P is transferred in the arrow direction, there is the paper currency P with the deformed front end P- 1  in the transfer direction. 
       FIG. 9C  is a side view showing delivery of the deformed paper currency between the transfer units of the paper currency transfer section. When the deformed paper currency P is transferred, and in particular when the paper currency P is sent out from the sending-side transfer belts  84   a  and  84   b , the constraint to the front end P- 1  of the paper currency P disappears between the sending-side paper currency transfer passage  81  and the receiving-side paper currency transfer passage  91 , and therefore, the state of the front end P- 1  becomes unstable. Consequently, as shown in  FIG. 9C , the front end P- 1  of the paper currency P is abutted against the receiving transfer belt  94   a  and  92   a  of the receiving-side paper currency transfer passage  91  to be further deformed or buckled, so that the paper currency P cannot be finally transferred to the receiving-side paper currency transfer passage  91  due to jamming of paper currency. 
     In order to solve the above problem, Japanese Patent Application Laid-Open (JP-A) No. 7-200923 discloses a technique for preventing the paper currency jamming at the paper currency delivery portion. Namely, in JP-A No. 7-200923, a paper currency guide member performing swinging motion is provided at the paper currency delivery portion, and a delivery passage is enlarged or reduced by the swinging motion of the paper currency guide member. 
     SUMMARY OF INVENTION 
     Technical Problem 
     However, in JP-A No. 7-200923, since the paper currency guide member performing swinging motion is required to be provided at the paper currency delivery portion, the structure is complicated. Further, a dedicated drive source for making the paper currency guide member perform the swinging motion is required to be provided. 
     The present invention provides a medium transfer device, which prevents jamming of paper currency in a paper currency transfer section constituted of plural transfer units, and, at the same time, does not complicate the structure, and has a paper currency transfer section requiring no dedicated drive source. 
     Solution to Problem 
     An aspect of the present invention is a medium transfer device, which delivers a medium from a first transfer passage to a second transfer passage, including: a receiving-side transfer roller of the second transfer passage; and a bladed wheel provided coaxially with the receiving-side transfer roller. 
     Advantageous Effects of Invention 
     According to the present invention, there can be obtained a medium transfer device, which prevents jamming of paper currency in a paper currency transfer section constituted of plural transfer units, and, at the same time, does not complicate the structure, and has a paper currency transfer section requiring no dedicated drive source. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a side view showing delivery between transfer units of a paper currency transfer section according to a first exemplary embodiment; 
         FIG. 2  is a configuration diagram showing a schematic configuration of an automatic paper currency deposit/withdrawal machine; 
         FIG. 3  is a front view of a receiving-side paper currency transfer passage as viewed from the upstream side; 
         FIG. 4  is a side view showing a variation of the delivery between the transfer units of the paper currency transfer section according to the first exemplary embodiment; 
         FIG. 5  is a side view showing delivery between the transfer units of a paper currency transfer section according to a second exemplary embodiment; 
         FIG. 6  is a partially omitted front view of the receiving-side paper currency transfer passage as viewed from the upstream side; 
         FIG. 7  is a front view of the receiving-side paper currency transfer passage as viewed from the upstream side; 
         FIG. 8A  is a side view schematically showing a paper currency transfer section of the conventional automatic paper currency deposit/withdrawal machine; 
         FIG. 8B  is a side view schematically showing a paper currency transfer section of the conventional automatic paper currency deposit/withdrawal machine; 
         FIG. 9A  is an explanatory view showing a transfer state of paper currency in the conventional paper currency transfer section; 
         FIG. 9B  is an explanatory view showing a transfer state of paper currency in the conventional paper currency transfer section; and 
         FIG. 9C  is an explanatory view showing a transfer state of paper currency in the conventional paper currency transfer section. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     First Exemplary Embodiment 
     Hereinafter, a first exemplary embodiment is described.  FIG. 2  is a configuration diagram showing a schematic configuration of an automatic paper currency deposit/withdrawal machine  10  according to the first exemplary embodiment. In  FIG. 2 , a customer section  1  stores paper currency P to be given to customers in money withdrawal processing and takes the paper currency P, received from customers, into the device in money deposit processing. A discrimination section  2  determines the authenticity of the deposited or withdrawn paper currency P and, at the same time, determines the number of the paper currencies P. A temporary holding section  3  accumulates the deposited paper currency P and temporarily reserves the paper currency P. A storage section  4  is operated as an internal safe for storing the paper currency P to be withdrawn. 
     A reject cassette section  5  stores the paper currency P unfit for handling by the automatic paper currency deposit/withdrawal machine  10 . A supply/collection section  6  supplies the paper currency P in the storage section  4  and collects the received paper currency P. A paper currency transfer section  7  is disposed to connect the constitutive units each other and transfers the paper currency P between the constitutive units. 
       FIG. 1  is a side view showing delivery between the transfer units of the paper currency transfer section  7  according to the first exemplary embodiment. A sending-side paper currency transfer passage  11  as a first transfer passage includes transfer rollers  12   a ,  12   b ,  13   a , and  13   b  and transfer belts  14   a  and  14   b . The upper transfer belt  14   a  is stretched between the transfer rollers  12   a  and  13   a  and rotated in the arrow direction at a predetermined rotation speed by a drive source (not shown). As with the upper transfer belt  14   a , the lower transfer belt  14   b  is stretched between the transfer rollers  12   b  and  13   b  and rotated in the arrow direction at a predetermined rotation speed by a drive source (not shown). The upper and lower transfer belts  14   a  and  14   b  rotate while interposing the paper currency P in between to thereby transfer the paper currency P in the arrow direction that is the downstream of the paper currency transfer section  7 . The sending-side transfer rollers  13   a  and  13   b  of the transfer rollers  12   a ,  12   b ,  13   a , and  13   b  send and give the paper currency P to a receiving-side paper currency transfer passage  21  next to the sending-side paper currency transfer passage  11 . 
     The receiving-side paper currency transfer passage  21  as a second transfer passage is provided on the downstream side in the transfer direction of the paper currency P. The delivery section of the paper currency P is constituted between the transfer unit as the sending-side paper currency transfer passage  11  and the transfer unit as the receiving-side paper currency transfer passage  21 . Each of the transfer units and the delivery section are continuously constituted between each of the constitutive units such as the customer section  1  and the storage section  4  in the automatic paper currency deposit/withdrawal machine  10  to constitute the paper currency transfer section  7 . The paper currency P is sent out from the sending-side paper currency transfer passage  11  to be received in the receiving-side paper currency transfer passage  21 , and, thus, to be transferred between each of the transfer units from the upstream to the downstream in the transfer direction. 
     The receiving-side paper currency transfer passage  21  includes transfer rollers  22   a ,  22   b ,  23   a , and  23   b , transfer belts  24   a  and  24   b , and a bladed wheel  25 . The upper transfer belt  24   a  is stretched between the transfer rollers  22   a  and  23   a  and rotated in the arrow direction by a drive source (not shown). As with the upper transfer belt  24   a , the lower transfer belt  24   b  is stretched between the transfer rollers  22   b  and  23   b  and rotated in the arrow direction by a drive source (not shown). The upper and lower transfer belts  24   a  and  24   b  rotate while interposing the paper currency P in between to thereby transfer the paper currency P in the arrow direction that is the downstream of the paper currency transfer section  7 . The receiving-side transfer rollers  22   a  and  22   b  of the transfer rollers  22   a ,  22   b ,  23   a , and  23   b  receive the paper currency P sent from the sending-side paper currency transfer passage  11  on the upstream side. 
     In the first exemplary embodiment, the bladed wheel  25  is provided coaxially with the receiving-side transfer roller  22   a . The bladed wheel  25  has plural blades  25 - 1  formed of an elastic body and is rotated in the arrow direction by a drive source to be described later. When the paper currency P sent from the sending-side paper currency transfer passage  11  on the upstream side has the deformed front end P- 1 , the blades  25 - 1  of the rotated bladed wheel  25  force the front end P- 1  downward. According to this constitution, the deformed front end P- 1  of the paper currency P is forced downward by the blades  25 - 1  of the rotated bladed wheel  25  before being abutted against the receiving-side transfer roller  22   a . The front end P- 1  of the paper currency P is then introduced in between the receiving-side transfer rollers  22   a  and  22   b  and, in other words, between the upper and lower transfer belts  24   a  and  24   b , so that the transfer in the receiving-side paper currency transfer passage  21  is facilitated. 
       FIG. 3  is a front view of the receiving-side paper currency transfer passage  21  as viewed from the upstream side. The roller shafts  31   a  and  31   b  and a gear shaft  32  are supported in parallel by right and left support frames  40 . The transfer belts  24   a  and  24   b  are stretched respectively over the transfer roller  22   a  and  22   b , and the transfer roller  22   a  and  22   b  are provided so as to be fixed at two positions of the roller shafts  31   a  and  31   b . The upper transfer roller  22   a  is rotated by the roller shaft  31   a  through a drive gear  30  by a drive source (not shown). 
     The bladed wheel  25  is coaxial with the transfer roller  22   a  and is provided rotatably around the roller shaft  31   a  through a bearing. The bladed wheels  25  and the transfer rollers  22   a  are alternately provided. The bladed wheels  25  are provided at three positions in a direction vertical to the transfer direction of the paper currency P. The bladed wheel  25  is rotated at higher speed than the transfer roller  22   a  by the rotation of the roller shaft  31   a . In order to obtain the rotation of the bladed wheel  25 , the rotation of the roller shaft  31   a  is transmitted to a roller shaft gear  31 - 1  and a gear shaft gear  32 - 1  to the gear shaft  32  to be further transmitted to a gear shaft gear  32 - 2  and a bladed wheel gear  25 - 2 . The bladed wheel gear  25 - 2  is formed integrally with the bladed wheel  25 . The drive source of the bladed wheel  25  is used in common with the drive source of the transfer roller  22   a.    
     According to the above constitution, the bladed wheel  25  starts rotating simultaneously with the rotation of the transfer roller  22   a . The bladed wheel  25  can rotate at higher speed than the transfer roller  22   a  by a gear ratio between the roller shaft gear  31 - 1 , the gear shaft gear  32 - 1 , the gear shaft gear  32 - 2 , and the bladed wheel gear  25 - 2 . Since the bladed wheel  25  rotates at higher speed than the transfer roller  22   a , the blades  25 - 1  of the bladed wheel  25  force downward the front end P- 1  of the paper currency P. 
     The number of rotations of the bladed wheel  25  is experimentally obtained. The bladed wheel  25  is provided rotatably around the roller shaft  31   a  through the bearing. However, since the bladed wheel  25  is regulated by a regulating member (not shown), the bladed wheel  25  does not move in the axial direction of the roller shaft  31   a . A transfer guide (not shown) regulating the paper currency P in a direction vertical to the transfer direction of the paper currency P may be provided according to need. 
       FIG. 4  is a side view showing a variation of the delivery between the transfer units of the paper currency transfer section  7  according to the first exemplary embodiment.  FIG. 4  shows that there is a gap between the roller shafts  33   a  and  33   b  supporting the sending-side transfer rollers  13   a  and  13   b  in the sending-side paper currency transfer passage  11 . Namely, the roller shaft  33   b  of the lower transfer roller  13   b  is located on the more downstream side than the roller shaft  33   a  of the upper transfer roller  13   a  by a gap D 1 . According to this constitution, the front end P- 1  of the paper currency P is slightly twisted upward as shown by the arrow, and the blades  25 - 1  of the bladed wheel  25  exercise the effect of forcing the front end P- 1  of the paper currency P downward. 
     According to the first exemplary embodiment, in the paper currency transfer section  7  constituted of the plural transfer units, the bladed wheel  25  is provided coaxially with the receiving-side transfer roller  22   a  as the second transfer passage. Thus, even if the front end P- 1  of the paper currency P is folded, the front end P- 1  of the paper currency P is not abutted against the transfer roller  22   a  and the transfer belt  24   a , and the front end P- 1  of the paper currency P can be easily introduced in between the transfer belts  24   a  and  24   b  in the second transfer passage. Consequently, there can be obtained a medium transfer device which can prevent jamming of paper currency from occurring in the paper currency delivery section between the units, and, at the same time, does not complicate the structure, and has the paper currency transfer section  7  requiring no dedicated drive source. 
     Second Exemplary Embodiment 
     Next, a second exemplary embodiment is described.  FIG. 5  is a side view showing the delivery between the transfer units of the paper currency transfer section  7  according to the second exemplary embodiment. Since the sending-side paper currency transfer passage  11  as the first transfer passage is similar to that of the first exemplary embodiment, the description of the first exemplary embodiment is incorporated. 
     Further, as in the first exemplary embodiment, also in the second exemplary embodiment, a delivery section of paper currency P is constituted between the transfer unit as the sending-side paper currency transfer passage  11  and the transfer unit as a receiving-side paper currency transfer passage  21 , and each of the transfer units and the delivery section are continuously constituted between each of the constitutive units such as the customer section  1  and the storage section  4  in the automatic paper currency deposit/withdrawal machine  10 . Thus, the description of the first exemplary embodiment is incorporated. 
     The receiving-side paper currency transfer passage  21  includes transfer rollers  22   a ,  22   b ,  23   a , and  23   b , transfer belts  24   a  and  24   b , and bladed wheels  25   a  and  25   b . The upper transfer belt  24   a  is stretched between the transfer rollers  22   a  and  23   a  and rotated in the arrow direction at a predetermined rotation speed by a drive source (not shown). As with the upper transfer belt  24   a , the lower transfer belt  24   b  is stretched between the transfer rollers  22   b  and  23   b  and rotated in the arrow direction at a predetermined rotation speed by a drive source (not shown). The upper and lower transfer belts  24   a  and  24   b  rotate while interposing the paper currency P in between to thereby transfer the paper currency P in the arrow direction that is the downstream of the paper currency transfer section  7 . The receiving-side transfer rollers  22   a  and  22   b  of the transfer rollers  22   a ,  22   b ,  23   a , and  23   b  receive the paper currency P sent from the sending-side paper currency transfer passage  11  on the upstream side. 
     In the second exemplary embodiment, the bladed wheel  25   a  is provided coaxially with the receiving-side transfer roller  22   a  provided on the upper side. The bladed wheel  25   b  is provided coaxially with the receiving-side transfer roller  22   b  provided on the lower side. The bladed wheels  25   a  and  25   b  respectively have plural blades  25   a - 1  and  25   b - 1  formed of an elastic body and are rotated in the arrow direction by a drive source to be described later. When the paper currency P sent from the sending-side paper currency transfer passage  11  on the upstream side has the front end P- 1  deformed upward, the blades  25   a - 1  of the upper bladed wheel  25   a  force the front end P- 1  downward before the front end P- 1  is abutted against the receiving-side transfer roller  22   a . Meanwhile, when the paper currency P has a front end P- 2  deformed downward, the blades  25   b - 1  of the lower bladed wheel  25   b  force the front end P- 2  upward before the front end P- 2  is abutted against the receiving-side transfer roller  22   b . According to this constitution, the deformed front end P- 1  or P- 2  of the paper currency P is introduced in between the receiving-side transfer rollers  22   a  and  22   b  and, in other words, between the upper and lower transfer belts  24   a  and  24   b , so that the transfer in the receiving-side paper currency transfer passage  21  is facilitated. 
     According to the above constitution, when a bundle of the paper currencies P is transferred, even if the front ends P- 1  and P- 2  of the paper currencies P are deformed upward or downward, the paper currencies P can be introduced in between the transfer belts  24   a  and  24   b  by the blades  25   a - 1  and  25   b - 1  of the bladed wheels  25   a  and  25   b.    
       FIG. 6  is a partially omitted front view of the receiving-side paper currency transfer passage  21  as viewed from the upstream side. In  FIG. 6 , a drive system is omitted. The upper roller shaft  31   a  has the two fixed transfer rollers  22   a , and the transfer belts  24   a  are stretched over the transfer rollers  22   a . The roller shaft  31   a  has the three bladed wheels  25   a  rotatably provided through a bearing so as to be coaxial with the transfer rollers  22   a . As with the upper roller shaft  31   a , the lower roller shaft  31   b  also has the two fixed transfer rollers  22   b , and the transfer belts  24   b  are stretched over the transfer rollers  22   b . The roller shaft  31   b  has the three bladed wheels  25   b  rotatably provided through a bearing so as to be coaxial with the transfer rollers  22   b . In order to prevent the blades  25   a - 1  and the blades  25   b - 1  from interfering with each other, a gap D 2  is provided between the positions where the upper and lower bladed wheels  25   a  and  25   b  are provided, as shown in  FIG. 6 . 
       FIG. 7  is a front view of the receiving-side paper currency transfer passage  21  as viewed from the upstream side. The roller shafts  31   a  and  31   b  and gear shafts  32   a  and  32   b  are supported in parallel by support frames  40 . The transfer belts  24   a  and  24   b  are stretched respectively over the transfer roller  22   a  and  22   b , and the transfer roller  22   a  and  22   b  are provided respectively around the roller shafts  31   a  and  31   b . The upper transfer roller  22   a  is rotated by the roller shaft  31   a  through a drive gear  30   a  by a drive source (not shown). Likewise, the lower transfer roller  22   b  is rotated by the roller shaft  31   b  through a drive gear  30   b.    
     The upper bladed wheel  25   a  is coaxial with the transfer roller  22   a  and provided rotatably around the roller shaft  31   a  through a bearing. The upper bladed wheels  25   a  and the transfer rollers  22   a  are alternately provided. The upper bladed wheels  25   a  are provided at three positions of the roller shaft  31   a  in a direction vertical to the transfer direction of the paper currency P. The upper bladed wheels  25   a  are rotated at higher speed than the transfer roller  22   a  by the rotation of the roller shaft  31   a . The rotation of the upper bladed wheels  25   a  is transmitted from a roller shaft gear  31   a - 1  and a gear shaft gear  32   a - 1  to a gear shaft  32   a  by the rotation of the roller shaft  31   a  to be then transmitted to a gear shaft gear  32   a - 2  and a bladed wheel gear  25   a - 2 . The bladed wheel gear  25   a - 2  is formed integrally with the bladed wheel  25   a . The drive source of the upper bladed wheel  25   a  is used in common with the drive source of the transfer roller  22   a . According to this constitution, the bladed wheel  25   a  starts rotating simultaneously with the rotation of the transfer roller  22   a . The bladed wheel  25   a  can rotate at higher speed than the transfer roller  22   a  by a gear ratio between the roller shaft gear  31   a - 1 , the gear shaft gear  32   a - 1 , the gear shaft gear  32   a - 2 , and the bladed wheel gear  25   a - 2 . Since the bladed wheel  25   a  rotates at higher speed than the transfer roller  22   a , the blades  25   a - 1  of the bladed wheel  25   a  force the front end P- 1  of the paper currency P downward. 
     Meanwhile, the lower bladed wheel  25   b  is coaxial with the transfer roller  22   b  and provided rotatably around the roller shaft  31   b . The lower bladed wheels  25   b  and the transfer rollers  22   b  are alternately provided. The lower bladed wheels  25   b  are provided at three positions of the roller shaft  31   b  in a direction vertical to the transfer direction of the paper currency P. The lower bladed wheels  25   b  is rotated at higher speed than the transfer roller  22   b  by the rotation of the roller shaft  31   b . The rotation of the lower bladed wheels  25   b  is transmitted from a roller shaft gear  31   b - 1  and a gear shaft gear  32   b - 1  to a gear shaft  32   b  by the rotation of the roller shaft  31   b  to be then transmitted to a gear shaft gear  32   b - 2  and a bladed wheel gear  25   b - 2 . The bladed wheel gear  25   b - 2  is formed integrally with the bladed wheel  25   b . The drive source of the lower bladed wheel  25   b  is used in common with the drive source of the transfer roller  22   b . According to this constitution, the bladed wheel  25   b  starts rotating simultaneously with the rotation of the transfer roller  22   b . The bladed wheel  25   b  can rotate at higher speed than the transfer roller  22   b  by a gear ratio between the roller shaft gear  31   b - 1 , the gear shaft gear  32   b - 1 , the gear shaft gear  32   b - 2 , and the bladed wheel gear  25   b - 2 . Since the bladed wheel  25   b  rotates at higher speed than the transfer roller  22   b , the blades  25   b - 1  of the bladed wheel  25   b  force the front end P- 1  of the paper currency P upward. 
     The numbers of rotations of the bladed wheels  25   a  and  25   b  are experimentally obtained. The bladed wheels  25   a  and  25   b  are provided rotatably respectively around the roller shafts  31   a  and  31   b . However, since the bladed wheels  25   a  and  25   b  are regulated by a regulating member (not shown), the bladed wheels  25   a  and  25   b  do not move respectively in the axial directions of the roller shafts  31   a  and  31   b.    
     In the second exemplary embodiment, the lower transfer roller  22   b  is fixedly provided around the roller shaft  31   b , and the bladed wheel  25   b  is provided rotatably around the roller shaft  31   b . However, the invention is not limited to this constitution. Namely, the bladed wheel  25   b  may be fixedly provided around the roller shaft  31   b , and the transfer roller  22   b  may be provided rotatably around the roller shaft  31   b . The rotating force of the roller shaft  31   b  (in this case, the shaft of the bladed wheel) is transmitted from another roller shaft through a belt (not shown), and the transfer roller  22   b  is rotatably axially supported through a bearing. The bladed wheel  25   a  may be fixedly provided around the roller shaft  31   a , and the transfer roller  22   a  may be provided rotatably around the roller shaft  31   a.    
     As described above, according to the second exemplary embodiment, the bladed wheels  25   a  and  25   b  are provided coaxially with the receiving-side upper and lower transfer rollers  22   a  and  22   b . According to this constitution, even if the deformed front ends P- 1  and P- 2  of the paper currency P are folded upward or downward, the paper currency P can be introduced in between the transfer belts  24   a  and  24   b . Accordingly, there can be obtained a medium transfer device which prevents the paper currency jamming, and, at the same time, does not complicate the structure, and has a paper currency transfer section requiring no dedicated drive source. 
     The first and second exemplary embodiments have described the example in which the sending-side paper currency transfer passage  11  and the receiving-side paper currency transfer passage  21  are located horizontally. However, the invention is not limited to this example, and the invention is also applicable to an example in which the sending-side paper currency transfer passage  11  and the receiving-side paper currency transfer passage  21  are located vertically. The first and second exemplary embodiments have further described the example in which the sending-side paper currency transfer passage  11  and the receiving-side paper currency transfer passage  21  are disposed linearly. However, the invention is not limited to this example, and the invention is also applicable to an example in which the sending-side paper currency transfer passage  11  and the receiving-side paper currency transfer passage  21  are disposed with a certain angle. 
     As the paper currency transfer section  7 , when the paper currency is transferred from the sending-side paper currency transfer passage  11  to the receiving-side paper currency transfer passage  21  in one direction, the invention is not limited to the constitution in which the bladed wheel  25  is provided coaxially with the receiving-side transfer roller  22 . Namely, when the paper currency is delivered bi-directionally between the sending-side paper currency transfer passage  11  and the receiving-side paper currency transfer passage  21 , the bladed wheels  25  may be provided around both the receiving-side transfer roller  22  and the sending-side transfer roller  23 . 
     As a medium to be transferred, although the paper currency P has been described as an example, the invention is not limited to this example and is applicable to all paper sheets.