Abstract:
In a media storing and feeding device for winding up or rewinding the tapes between reels attached to reel shafts and a drum  120  by torque limiters to feed or store the medium, at the time of feeding the medium, the reel shafts are rotated at a speed faster than a speed at which the drum rewinds the tapes, and at the time of storing the medium, the reel shafts are rotated at a speed slower than a speed at which the drum winds up the tapes. A difference between the rotational speeds of the reel shafts and the reels is absorbed by the torque limiters. The media storing and feeding device is thus implemented by inexpensive torque limiters which operate at low speed in place of expensive torque limiters supporting high speed.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a media storing and feeding device, and more specifically to a device that stores and feeds leaf-like media such as bank bills, checks, deeds or instruments by winding up and rewinding a tape or tapes between a drum and reels for use in a bill depositing and withdrawing machine, a check/deed collecting and issuing machine, a bank bill/check/deed delivery system, or the like. 
         [0003]    2. Description of the Background Art 
         [0004]    Conventionally, as devices that store and feed leaf-like media by winding up and rewinding a tape or tapes between a drum and reels, there are a type of system using two tapes, as disclosed by, for example, U.S. Pat. No. 5,064,074 to Edin et al., and another type of system using a single tape as disclosed by, for example, Japanese Patent Laid-Open Publication No. 12558/1983. Further, as for a system to drive a tape or tapes, Edin et al., uses a plurality of motors, and, for example, Japanese Patent Laid-Open Publication No. 67382/1996 uses a single motor to drive the tape. 
         [0005]    The system in which two tapes are used and are driven by one motor will be described hereinafter with reference to  FIGS. 30 and 31 , which explanatorily show the main part of the system in a side and a plan view, respectively. In the figures, reference numeral  100  denotes a storing and feeding device. Reference numerals  110  and  115  denote tapes, which have the same shape and length as each other. The tapes  110  and  115  have one end wound around a drum  120  and the other end wound around reels  130  and  135 . 
         [0006]    The drum  120  is adapted to wind up a medium  300  pinched between the tapes  110  and  115  along with the tapes  110  and  115 , and is fixed on a drum shaft  121 . Further, the reels  130  and  135  are adapted to wind up only the tapes  110  and  115 , and both reels  130  and  135  have the same shape. Both reels  130  and  135  are attached to respective reel shafts  131  and  136  via torque limiters  132  and  137 . 
         [0007]    Reference numeral  185  denotes a media infeed-and-outfeed opening, which is located outside a media storing and feeding device  100 . A medium conveyed from a conveyance unit, not shown, is taken into the media storing and feeding device  100  from the media infeed-and-outfeed opening  185 . Idle pulleys  190  and  195  for the tapes  110  and  115  are mounted in the media infeed-and-outfeed opening  185 , and the tapes  110  and  115  are wound around the reels  130  and  135  via the idle pulleys  190  and  195  from the drum  120 . 
         [0008]    Reference numeral  105  denotes a frame for the media storing and feeding device  100 , and the drum shaft  121  is attached to the frame  105  via a bearing  106 . The drum shaft  121  is configured to freely rotate with respect to the frame  105  by the bearing  106 . Reference numeral  140  is directed to a driving motor that transmits a drive force to a drum gear  142 . The drum gear  142  is fixed to the drum shaft  121 , so that, when the driving motor  140  rotates, the drum shaft  121  and the drum  120  are rotated. 
         [0009]    With respect to the drum shaft  121  and the reel shafts  131  and  136 , the following drive transmission means is provided. A drum gear  150  is attached to the drum shaft  121 , and engaged with reel gears  155  and  160 . The reel gears  155  and  160  have the same number of teeth as each other, and are attached to the reel shafts  131  and  136  via one-way clutches  165  and  170 . 
         [0010]    Further, the reel shafts  131  and  136  are attached to the frame  105  via one-way clutches  175  and  180 . With respect to the one-way clutches  165  and  170 , when the reel gears  155  and  160  rotate the reels  130  and  135  in the wind-up direction thereof, the one-way clutches  165  and  170  are locked, and the rotations of the reel gears  155  and  160  are transmitted to the reel shafts  131  and  136 . 
         [0011]    By contrast, when the drum gear  150  rotates the reels  130  and  135  in the rewinding direction thereof, the one-way clutches  165  and  170  are rotated in the idling direction thereof, so that the rotations of the reel gears  155  and  160  are not transmitted to the reel shafts  131  and  136 . Further, with respect to the one-way clutches  175  and  180 , when the reel shafts  131  and  136  are rotated in a direction in which the tapes  110  and  115  are wound up by the reels  130  and  135 , the one-way clutches  175  and  180  are idled. When the reel shafts  131  and  136  make an attempt to rotate in a direction in which the tapes  110  and  115  are rewound by the reels  130  and  135 , the one-way clutches  175  and  180  are locked, and are not rotated in the rewinding direction. 
         [0012]    The gear ratio of the drum gear  150  and the reel gears  155  and  160  is set such that, when the drum  120  rewinds the tapes  110  and  115 , a speed at which the reels  130  and  135  wind up the tapes  110  and  115  is always faster than a speed at which the drum  120  rewinds the tapes  110  and  115 . The details thereof will follow. 
         [0013]      FIG. 32  explanatorily shows how the drum rewinds the tapes. Given that the tape wound-up radius of the reels  130  and  135  is RA 1 , the tape wound-up radius of the drum  120  side is RA 2 , the number of gear teeth and the angular speed of the drum gear  150  are ZA 2  and WA 2 , respectively, the number of gear teeth and the angular speed of the reel gears  155  and  160  are ZA 1  and WA 1 , respectively, a tape winding-up speed by the reel shafts  131  and  136  is VA 1 , and the tape rewinding speed of the drum shaft  121  is VA 2 , then the expression 
         [0000]        VA 1 =RA 1 ×WA 1,  VA 2 =RA 2 ×WA 2   (1) 
         [0000]    is formed. 
         [0014]    In order to set the gear ratio such that a speed at which the reel shafts  131  and  130  wind up the tapes is faster than a speed at which the drum  120  rewinds the tapes  110  and  115 , the relationship between the speeds of VA 1  and VA 2  always secures 
         [0000]      VA1&gt;VA2.   (2) 
         [0000]    According to the expressions (1) and (2), 
         [0000]        RA 1 ×WA 1 &gt;RA 2 ×WA 2 →RA 1 /RA 2 &gt;WA 2 /WA 1.   (3) 
         [0000]    Because the ratio between angular speeds is determined by a gear ratio, 
         [0000]        WA 2/ WA 1 =ZA 1 /ZA 2.   (4) 
         [0000]    According to the expressions (3) and (4), 
         [0000]        RA 1 /RA 2 &gt;ZA 1 /ZA 2.   (5) 
         [0000]    Note that, the more the media are fed out, the larger the reel radius RA 1  is and the smaller the drum radius RA 2  is. With respect to RA 1  and RA 2  according to changes in radii, the following relational expressions hold as follows. 
         [0000]        RA 1 =ra 1 ×ka 1,   (6) 
         [0000]        RA 2 =ra 2 ×ka 2,   (7) 
         [0000]    where ra 1  is a reel radius on which there are no tapes wound, and ka 1  is a coefficient in which a reel radius is increased by winding up a tape. 
         [0015]    Given that ka 1  is equal to unity when there is no tape wound on the reel, i.e. when the media is stored fully in the storage capacity of the drum  120 , and ka 1  is equal to T 1  when the tapes are fully wound on the reels, i.e. when there are no tapes on the drum  120 , then with respect to ka 1 , 
         [0000]      1 ≦ka 1 ≦T 1(1 &lt;T 1)   (8) 
         [0000]    is formed, where ra 2  is the -radius of the drum on which there are no tapes wound, and ka 2  is a coefficient in which the radius of the drum is increased by winding up the tapes. 
         [0016]    Given that ka 2  is equal to unity when there are no tapes on the drum  120 , and ka 2  is equal to T 2  when the media are fully stored in the storage capacity of the drum  120 , with respect to ka  2 , 
         [0000]      1 ≦ka 2 ≦T 2(1 &lt;T 2)   (9) 
         [0000]    is formed. 
         [0017]    Because the minimum value of RA 1 /RA 2  is attained when RA 1  is of its minimum value and RA 2  is of its maximum value, according to expressions (6), (7), (8) and (9), the minimum value of RA 1 /RA 2  equal to (ra 1 ×1)/(ra 2 ×T 2 ). In order to always secure expression (5), it is necessary to satisfy expression (5) with the minimum value of RA 1 /RA 2 . Therefore, 
         [0000]        ra 1/( ra 2 ×T 2)&gt; ZA 1 /ZA 2.   (10) 
         [0000]    By setting the above-described gear ratio, it is secured that the relationship between the speeds of VA 1  and VA 2  always holds the relationship of VA 1 &gt;VA 2  even when the drum radius and the reel radii are changed by winding-up and rewinding the tapes. 
         [0018]    In this way, the gear ratio is set such that a speed at which the reels wind up the tapes is always faster than a speed at which the drum rewinds the tapes. A feeding operation of the media storing and feeding device  100  will be described hereinafter with reference to  FIG. 33 . The driving motor  140  rotates the drum  120  in the direction of arrow a 1 . At this time, because the reel gears  155  and  160  are rotated in the direction of arrow a 2  which is a reel winding-up direction via the drum gear  150 , the one-way clutches  165  and  170  are locked, and the rotations of the reel gears  155  and  160  are transmitted to the reel shafts  131  and  136 . 
         [0019]    Therefore, the reel shafts  131  and  136  are rotated in the direction of arrow a 3 , and the one-way clutches  175  and  180  are idled. It is thus possible for the reel shafts  131  and  136  to be rotated. Further, at this time, because the gear ratio is set such that a speed at which the reel shafts  131  and  136  wind up the tapes  110  and  115  is always faster than a speed at which the drum  120  rewinds the tapes  110  and  115  in order to satisfy the above-described expression (10), a difference between the speeds is absorbed by the rotations of the torque limiters  132  and  137  between the reels  130  and  135  and reel shafts  131  and  136 . Therefore, tensions are always applied to the tapes  110  and  115  by the torque limiters  132  and  137 . 
         [0020]    In accordance therewith, because the drum  120  is rotated in the direction of arrow al while rewinding the tapes  110  and  115  in a state in which tensions are always applied to the tapes  110  and  115 , a medium  310  pinched between the tapes  110  and  115  is fed out of the drum  120  by the rewinding of the drum  120 , and the medium  310  runs between the tapes  110  and  115  to be discharged from the media infeed-and-outfeed opening  185 . 
         [0021]    A storing operation of the media storing and feeding device  100  will be described with reference to  FIG. 34 . When a medium  320  is conveyed into the media storing and feeding device  100  from media infeed-and-outfeed opening  185 , the driving motor  140  rotates the drum  120  in the direction of arrow b 1 . At this time, because the reel gears  155  and  160  are rotated in the direction of arrow b 2  which is a reel rewinding direction, the one-way clutches  165  and  170  are idled, and the rotations of the reel gears  155  and  160  are not transmitted to the reel shafts  131  and  136 . 
         [0022]    Therefore, the drive is transmitted to only the drum  120 , and the drum  120  is rotated in the direction of arrow b 1 . At this time, because the tapes  110  and  115  are wound up on the drum  120  by the rotation of the drum  120 , force to rotate those in the rewinding direction is applied to the reels  130  and  135  by the tapes. At this time, the force is applied to the reel shafts  131  and  136  so as to rewind the tapes. However, because those are locked by the one-way clutches  175  and  180 , the reel shafts  131  and  136  are not rotated in the rewinding direction. 
         [0023]    Thus, the force is applied to the reels  130  and  135  in the rotational direction by the tapes. However, because the reel shafts  131  and  136  are not rotated, the torque limiters  132  and  137  between the reels  130  and  135  and the reel shafts  131  and  136  are rotated, which rotates the reels  130  and  135 , and the tapes  110  and  115  are wound up on the drum  120  from the reels  130  and  135 . Therefore, the tapes  110  and  115  are in a state in which tensions are always applied thereto by the torque from the torque limiters  132  and  137 . 
         [0024]    In this way, the medium  320  coming from the media infeed-and-outfeed opening  185  is wound up on the drum  120  while being pinched between the tapes  110  and  115 , and the medium is stored. Thus, in storing and feeding operations, when the tapes  110  and  115  are loosened, there is a problem such that the tapes  110  and  115  come free from the idle pulleys  190  and  195  or the reels  130  and  135 , or the force pinching a medium at the time of rewinding disappears. However, in the above-described storing and feeding operations, the tensions are always applied to the tapes, which do not allow the tapes to be loosened. 
         [0025]    However, under the prior art described above, because the reel shafts  131  and  136  always rotate slower than the reels  130  and  135  in the feeding operation, the torque limiters  132  and  137  are always rotated. Further, in the storing operation, because the reels  130  and  135  are rotated with respect to the reel shafts  131  and  136  which are not rotated, the torque limiters  132  and  137  are always rotated. 
         [0026]    Given that the angular speed of the torque limiters in the feeding operation is TA 1 , and the angular speed of the torque limiters in the storing operation is TA 2 , then 
         [0000]        TA 1=(angular speed of the reel shafts)/(angular speed of the reels),   (11) 
         [0000]        TA 2=(angular speed of the reels).   (12) 
         [0000]    In the torque limiters, there is the problem that the greater the angular speed the shorter the lifetime. Further, the torque limiters supporting high rotational speed are expensive, so that torque limiters making an attempt to satisfy the quality and the cost are required to be used at low rotational speed. 
         [0027]    Therefore, in the rotation in feeding operation, it is necessary to loose an angular speed by setting a ratio between the number of teeth ZA 2  of the drum gear  150  and the number of teeth ZA 1  of the reel gears  155  and  160  so as to decrease the angular speed, or rate, of TA 1  as low as practical within the range of the relationship of (angular speed of the reel shafts)&gt;(angular speed of the reels). Namely, it is necessary to increase the ratio of ZA 1 /ZA 2  within a range in which expression (10) is satisfied. In the rotation in storing operation, because the angular speed of the reel shafts is stopped, the calculation is made by the tape speed VA 1  and the reel radius RA 1 , thus 
         [0000]        TA 2 =VA 1 /RA 1.   (13) 
         [0028]    Because the reel shafts are not rotated as in feeding operation, there is no factor to decrease the angular speed of the torque limiters with respect to the angular speed of the reels, and the angular speed of the torque limiters is increased in some cases. 
         [0029]    A specific example N 1  will be shown below. Given that 
         [0030]    a reel radius on which there are no tapes is ra 1 =50 mm, 
         [0031]    a coefficient in which a reel radius is increased when the tapes are fully wound thereon is T 1 =1.3, 
         [0032]    a drum radius on which there are no tapes is ra 2 =80 mm, 
         [0033]    a coefficient in which a drum radius is increased when the tapes are fully wound thereon is T 2 =1.5, and 
         [0034]    a speed of storing and feeding the tapes is VA=1200 mm/s, then the angular speed TA 1  of the torque limiters in feeding operation is determined. 
         [0035]    Given that a drum shaft angular speed WA 2 =VA 1 /RA 2 , 
         [0000]      a reel shaft angular speed  WA 1=( ZA 2 /ZA 1)× WA 2=( ZA 2 /ZA 1)× VA 1/ RA 2, 
         [0000]      a reel angular speed  WA 3= VA 1/ RA 1, 
         [0000]    then according to expression (11), 
         [0000]        TA 1=( ZA 2 /ZA 1)× VA 1 /RA 2 −VA 1 /RA 1.   (14) 
         [0000]    Because it is necessary to always satisfy expression (10) as the ratio of ZA 2 /ZA 1 , according to expression (10), 
         [0000]        ra 1/( ra 2 ×T 2)&gt; ZA 1 /ZA 2, 
         [0000]      50/(80×1.5)&gt; ZA 1 /ZA 2, 
         [0000]      0.4167 &gt;ZA 1 /ZA 2, and 
         [0000]        ZA 1 /ZA 2=0.41. 
         [0036]    According to expression (14), 
         [0000]    
       
         
           
             
               
                 
                   
                     TA 
                      
                     
                         
                     
                      
                     1 
                   
                   = 
                     
                    
                   
                     
                       
                         ( 
                         
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                           0.41 
                         
                         ) 
                       
                       × 
                       VA 
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                        
                       
                         1 
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                         RA 
                       
                        
                       
                           
                       
                        
                       2 
                     
                     - 
                     
                       VA 
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                         1 
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                         RA 
                       
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                       [ 
                       
                         
                           
                             
                               ( 
                               
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                               ) 
                             
                             / 
                             RA 
                           
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                     VA 
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                     1. 
                   
                 
               
             
           
         
       
     
         [0000]    According to expressions (6) and (7), 
         [0000]        TA 1=[(1/0.41)/( ra 1 ×ka 2)−1/( ra 1 ×ka 1)]× VA 1. 
         [0000]    The maximum value as TA 1  is established when (ra 2 ×ka 2 ) takes its the minimum value and (ra 1 ×ka 1 ) its maximum value, i.e. when there are no tapes on the drum  120 , and the tapes are fully wound on the reels. 
         [0037]    At that time, 
         [0000]    
       
         
           
             
               
                 
                   
                     TA 
                      
                     
                         
                     
                      
                     1 
                      
                     
                       ( 
                       
                         maximum 
                          
                         
                             
                         
                          
                         value 
                       
                       ) 
                     
                   
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                       [ 
                       
                         
                           
                             ( 
                             
                               1 
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                             ) 
                           
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                             ( 
                             
                               ra 
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                               1 
                             
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                             ( 
                             
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                       ] 
                     
                     × 
                     VA 
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                      
                     1 
                   
                 
               
             
             
               
                 
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                       [ 
                       
                         
                           
                             1 
                             / 
                             
                               ( 
                               0.41 
                               ) 
                             
                           
                           / 
                           80 
                         
                         - 
                         
                           1 
                           / 
                           
                             ( 
                             
                               50 
                               × 
                               1.3 
                             
                             ) 
                           
                         
                       
                       ] 
                     
                     × 
                     1200 
                   
                 
               
             
             
               
                 
                   = 
                     
                    
                   
                     18.12 
                     . 
                   
                 
               
             
           
         
       
     
         [0000]    On the other hand, to determine the angular speed of the torque limiters in storing operation, according to expression (13), 
         [0000]        TA 2 =VA 1 /RA 1, and 
         [0000]        TA 2 =VA 1/( ra 1 ×ka 1). 
         [0000]    The maximum value as TA 2  is established when (ra 1 ×ka 1 ) takes its minimum value, i.e. when there are no tapes on the reels. Then, 
         [0000]        TA 2(maximum value)= VA 1/( ra 1×1)]=1200/(50×1)=24.   (15) 
         [0038]    In this way, in storing operation, because the reel shafts are not rotated as in feeding operation, the angular speed is increased in some cases. Further, in the prior art, in addition to the problem that the angular speed of the torque limiters is increased, there is a problem that it is necessary to use four one-way clutches which are expensive and are a factor to increase the cost. 
       SUMMARY OF THE INVENTION 
       [0039]    It is an object of the present invention to provide an improved media storing and feeding device. 
         [0040]    In accordance with the present invention, a media storing and feeding device includes a reel that winds up a tape, a reel shaft that rotates the reel, a torque limiter that attaches the reel to the reel shaft, and a drum that winds up the tape and a medium together, and is configured to wind up or rewind the tape between the reel and the drum to feed or store the medium. In the media storing and feeding device, at the time of feeding the medium, the reel shaft is rotated at a speed faster than a speed at which the drum rewinds the tape, and at the time of storing the medium, the reel shaft is rotated at a speed slower than a speed at which the drum winds up the tape, and a difference in rotational speed between the reel shaft and the reel is absorbed by the torque limiter. 
         [0041]    In accordance with the present invention configured in this way, the reel shaft is rotated not only at the time of feeding the medium, but also at the time of storing the medium. It is therefore possible to greatly slow down the maximum angular speed in both of the storing and feeding operations, and the torque limiters can be used at low rotational speed, which makes it possible to obtain an advantageous effect that the lifetime of the torque limiters can be elongated. Moreover, it is possible to reduce the number of one-way clutches to be used. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0042]    The objects and features of the present invention will become more apparent from consideration of the following detailed description taken in conjunction with the accompanying drawings in which: 
           [0043]      FIG. 1  explanatorily shows in a side view the main part of an embodiment of a media storing and feeding device in accordance with the present invention; 
           [0044]      FIG. 2  explanatorily shows in a plan view the main part view of the embodiment shown in  FIG. 1 ; 
           [0045]      FIGS. 3A through 3D  explanatorily show the rotational directions of the one-way clutch included in the embodiment; 
           [0046]      FIGS. 4 and 5  are explanatory views useful for understanding the rotational directions of the drum gear and reel gears included in the embodiment; 
           [0047]      FIGS. 6 and 7  are explanatory views useful for understanding the rotational directions of the one-way clutch included in the embodiment; 
           [0048]      FIG. 8  is an explanatory view useful for understanding the rotational directions of the drum and reels included in the embodiment in storing operation; 
           [0049]      FIG. 9  is an explanatory view useful for understanding the rotational directions of the reel gears included in the embodiment in storing operation; 
           [0050]      FIGS. 10 and 11  are explanatory views useful for understanding the rotational directions of the one-way clutch included in the embodiment; 
           [0051]      FIGS. 12 and 13  are explanatory views useful for understanding the angular speed of the one-way clutch included in the embodiment; 
           [0052]      FIG. 14  is an explanatory view useful for understanding the rotational directions of the drum gear and the reel gears included in the embodiment; 
           [0053]      FIGS. 15 and 16  are explanatory views useful for understanding the angular speed of the one-way clutch included in the embodiment; 
           [0054]      FIG. 17  explanatorily shows in a side view, like  FIG. 1 , the main part of an alternative embodiment; 
           [0055]      FIG. 18  explanatorily shows in a plan view, like  FIG. 2 , the main part of the alternative embodiment shown in  FIG. 17 ; 
           [0056]      FIGS. 19 and 20  are explanatory views useful for understanding the rotational directions of the drum gear and reel gears included in the alternative embodiment in feeding operation; 
           [0057]      FIGS. 21 through 24  are explanatory views useful for understanding the angular speed of the one-way clutch included in the alternative embodiment; 
           [0058]      FIG. 25  is an explanatory view useful for understanding the rotational directions of the drum gear and the reel gears included in the alternative embodiment in storing operation; 
           [0059]      FIGS. 26 through 29  are explanatory views useful for understanding the angular speed of the one-way clutch included in the alternative embodiment; 
           [0060]      FIG. 30  explanatorily shows in a side view the main part of a prior art example of media storing and feeding device; 
           [0061]      FIG. 31  explanatorily shows in a plan view the main part of the prior art device shown in  FIG. 30 ; 
           [0062]      FIG. 32  explanatorily shows how the drum rewinds the tapes in the prior art device shown in  FIG. 30 ; 
           [0063]      FIG. 33  is an explanatory view useful for understanding the operation of feeding a medium of the prior art device; and 
           [0064]      FIG. 34  is an explanatory view useful for understanding the operation of storing a medium of the prior art device. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0065]    Preferred embodiments according to the present invention will be described with reference to the drawings. Reference is first made to  FIGS. 1 and 2 , which explanatorily show in a side and a plan view, respectively, the main part of an illustrative embodiment of a media storing and feeding device  100 A in accordance with the present invention. In the following description, like portions and components will be designated with the same reference numerals even as to those of the prior art devices described above. 
         [0066]    The media storing and feeding device  100 A shown in the figures includes a drum gear  405 , which is connected to a drum shaft  121  via a one-way clutch  420 . The drum gear  405  has teeth ZA 2  which are the same in number as the drum gear  150 ,  FIG. 30 . The device  100 A also included reel gears  410  and  415  which are engaged with the drum gear  405 , and are respectively fixed to the reel shafts  131  and  136 . The reel gears  410  and  415  have respective teeth, of which the number ZA 1  is the same as the reel gears  155  and  160 . 
         [0067]    The reel shafts  131  and  136  are attached to the frame  105  of the device  100 A via bearings  430  and  431 . The reel shafts  131  and  136  are configured to freely rotate with respect to the frame  105 . The device  100 A further includes a reel gear  411 , which is fixed on the reel shaft  131 , and has teeth of which the number is represented by ZA 3 . 
         [0068]    Further, the media storing and feeding device  100 A includes a drum gear  416 , which is connected to the drum shaft  121  via a one-way clutch  425 . The drum gear  416  has teeth, of which the number is equal to ZA 4 . With respect to the rotational directions of the one-way clutches  420  and  425 , the one-way clutches  420  and  425  with the embodiment shown in  FIG. 1  are locked and idled in the directions described in the following. 
         [0069]    On the side of the one-way clutch  420 , description will be made in detail with reference to  FIGS. 3A-3D . As shown by the solid arrow in  FIG. 3A , when the drum shaft  121  is rotated clockwise in the figure, the one-way clutch  420  is locked, and the one-way clutch  420  is rotated clockwise as shown by the dashed line arrow. 
         [0070]    As shown by the solid arrow in  FIG. 3B , when the drum shaft  121  is rotated counterclockwise, the one-way clutch  420  is not locked, and therefore the one-way clutch  420  is not rotated. As seen from the solid arrow in  FIG. 3C , when the drum gear  405  is rotated clockwise, the one-way clutch  420  is idled, and therefore the drum shaft  121  is not rotated. As depicted by the solid arrow in  FIG. 3D , when the drum gear  405  is rotated counterclockwise, the one-way clutch  420  is locked, and thus the drum shaft  121  is rotated counterclockwise. 
         [0071]    Therefore, when the drum gear  416  is rotated in a direction in which the drum  120  winds up the tapes, i.e. counterclockwise, by the reel gear  411 , the one-way cutch  425  is locked. At this time, given that the angular speed, or rate, of the reel shaft  131  is WA 3 , a tape rewinding speed is VA 3 , the angular speed of the drum is WA 4 , and a tape winding-up speed is VA 4 , a gear ratio is set such that ZA 3  and ZA 4  always hold the relationship of VA 4 &gt;VA 3 . 
         [0072]    More specifically, given that 
         [0000]        VA 3 =RA 1 ×WA 3 and  VA 4= RA 2× WA 4, 
         [0000]      VA3&lt;VA4, and 
         [0000]        RA 1 ×WA 3 &lt;RA 2 ×WA 1 →RA 1 /RA 2 &lt;WA 4 /WA 3, 
         [0000]    then, a ratio between the angular speeds is determined in accordance with a gear ratio, and therefore 
         [0000]        WA 4 /WA 3 =ZA 3 /ZA 4, and 
         [0000]        RA 1 /RA 2 &lt;ZA 3 /ZA 4.   (21) 
         [0000]    According to expressions (6) and (7), 
         [0000]        ZA 3 /ZA 4 &gt;RA 1 /RA 2=( ra 1 ×ka 1)/( ra 2 ×ka 2).   (22) 
         [0000]    Since expression (21) has to always be satisfied, it has necessarily be satisfied with the maximum value of (ra 1 ×ka 1 )/(ra 2 ×ka 2 ). 
         [0073]    Because the maximum value of (ra 1 ×ka 1 )/(ra 2 ×ka 2 ) is established when (ra 1 ×ka 1 ) is equal to its maximum value and (ra 2 ×ka 2 ) is to its minimum value, according to expressions (8) and (9), 
         [0000]      ( ra 1 ×ka 1)/( ra 2 ×ka 2)≦( ra 1 ×T 1)/( ra 2×1).   (23) 
         [0000]      Therefore, 
         [0000]        ZA 3 /ZA 4&gt;( ra 1 ×T 1)/( ra 2).   (24) 
         [0000]    By setting the above-described gear ratio, it is secured that the relationship between the speeds of VA 1  and VA 2  always holds the relationship of VA 4 &gt;VA 3  even when the drum radius and the reel radii are changed by winding-up and rewinding the tapes. 
         [0074]    In that way, the reel gear  411  and the drive gear  416  are set to have a gear ratio such that a speed at which the drum  120  winds up the tapes is faster than a speed at which the reels rewind the tapes. 
         [0075]    A feeding operation according to the above-described structure will be described hereinafter with reference to  FIGS. 2 and 4 . The driving motor  140  rotates in a direction in which the drum  120  rewinds the tapes, and the rotation is transmitted to the drum shaft  121  via the drum gear  142 . 
         [0076]    At this time, in the relationship between the drum shaft  121  and the one-way clutch  420 , as shown in  FIG. 3A , because the drum shaft  12  is rotated clockwise, the one-way clutch  420  is locked, and the one-way clutch  420  is rotated clockwise as shown by the dashed line arrow. Therefore, as shown in  FIG. 4 , the drum gear  405  is rotated in the direction of arrow c 1 , and the reel gears  410  and  415  are rotated in the direction of arrow c 2 . 
         [0077]    The reel gears  410  and  415  are fixed to the reel shafts  131  and  136 , and therefore the reel shafts  131  and  136  are rotated in the direction of arrow c 2  which is the winding direction. 
         [0078]    With respect to the rotational speed of the reel shafts  131  and  136 , the number of teeth ZA 2  of the drum gear  405  and the number of teeth ZA 1  of the reel gears  410  and  415  satisfy expression (10), and therefore, when the drum  120  rewinds the tapes, due to the drum  120  rewinding the tapes, the rotation is faster than an amount of rotation of the reels  130  and  135  which are connected to the drum  120  through the tapes. A difference between the rotational speeds is absorbed by the torque limiters  132  and  137  connected between the reels  130  and  135  and the reel shafts  131  and  136 . 
         [0079]    Further, as shown in  FIG. 5 , when the reel shaft  131  is rotated in the direction of arrow c 2 , the reel gear  411  is rotated in the direction of arrow c 3 . In accordance therewith, the drum gear  416  is rotated in the direction of arrow c 4 . 
         [0080]    Since the angular speed WX 2  of the drum gear  416  when the angular speed of the drum shaft  121  is WX 1  is determined in accordance with the numbers of teeth of the drum gear  405 , from which to the reel gear  410 , from which to the reel gear  411 , from which to the drum gear  416 , 
         [0000]        WX 2=(number of teeth of the drum gear 405/number of teeth of the reel gear 410)×(number of teeth of the reel gear 411/number of teeth of the drum gear 416)× WX 1, and 
         [0000]        WX 2=( ZA 2 /ZA 1)×( ZA 3 /ZA 4)× WX 1   (31) 
         [0081]    According to expression (10), 
         [0000]        ra 1/( ra 2 ×T 2)&gt; ZA 1 /ZA 2, and 
         [0000]        ZA 2 /ZA 1&gt;( ra 2 ×T 2)/ ra 1.   (32) 
         [0000]    According to expressions (24) and (32), expression (31) is formed as 
         [0000]    
       
         
           
             
               
                 
                   
                     
                       WX 
                        
                       
                           
                       
                        
                       2 
                     
                     &gt; 
                     
                       
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                       WX 
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                       ( 
                       
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                     1. 
                   
                 
               
             
           
         
       
     
         [0000]    According to expressions (8) and (9), because of the relationship 1&lt;T 1  and 1&lt;T 2 , the relationship (T 1 ×T 2 )&gt;1 is formed, and 
         [0000]      WX2&gt;WX1.   (33) 
         [0082]    Therefore, as shown in  FIG. 6 , as for the rotation of the one-way clutch  420  with respect to the drum shaft  121 , the drum shaft  121  is rotated at the angular speed of WX 1  clockwise as depicted by an arrow c 5 , and the one-way clutch  420  is rotated at the angular speed of WX 2  clockwise as depicted by an arrow c 6 . 
         [0083]    According to expression (33), because of the relationship WX 2 &gt;WX 1 , as for the relative angular speed of the one-way clutch  420  with respect to the drum shaft  121 , as shown in  FIG. 7 , the one-way clutch  420  is rotated clockwise as indicated by an arrow c 7 . In this case, as shown in  FIG. 3B , the one-way clutch  420  is idled, and the rotation of the drum gear  416  is not transmitted to the drum shaft  121 . 
         [0084]    Next, a storing operation will be described with reference to  FIGS. 2 and 8 . The drum  120  is rotated in a direction of winding up the tapes by the driving motor  140 , and the rotation is transmitted to the drum shaft  121  via the drum gear  142 . At this time, due to the drum  120  being rotated in the direction of arrow d 1  which is the winding direction, the tapes  110  and  115  are wound up, and the reels  130  and  135  around which the other ends of the tapes are wound are rotated in the direction of arrow d 2 . 
         [0085]    In accordance therewith, as shown in  FIG. 9 , the reel shaft  131  connected to the reel  130  via the torque limiter  132  is rotated in the direction of arrow d 3 , and the rotation of the drum gear  416  is transmitted in the direction of arrow d 4  through the reel gear  411 . With respect to the one-way clutch  425  at this time, because the one-way clutch  425  is rotated in the d 4  direction and the drum shaft  121  is rotated in the d 1  direction, both are rotated counterclockwise. 
         [0086]    As shown in  FIG. 10 , when the angular speed d 5  of the one-way clutch  425  is slower than the angular speed d 6  of the drum shaft  121 , the relative angular speed of the one-way clutch  425  with respect to the drum shaft  121  is, as shown by an arrow d 7  of  FIG. 11 , of a clockwise direction, and therefore, the one-way clutch  425  is idled as shown in  FIG. 3C . 
         [0087]    As shown in  FIG. 12 , when the angular speed d 8  of the one-way clutch  425  is faster than the angular speed d 9  of the drum shaft  121 , the relative angular speed of the one-way clutch  425  with respect to the drum shaft  121  is, as shown by an arrow d 10  of  FIG. 13 , of a counterclockwise direction. Therefore, as shown in  FIG. 3D , the one-way clutch  425  is locked, and the drum shaft  121  as well starts rotating at a speed which is the same as the one-way clutch  425  as shown by an arrow d 11 . 
         [0088]    Therefore, the reel shaft  131  is driven to rotate by the rotation of the reel  130 . However, a rotational speed of the reel shaft  131  is up to an angular speed at which the angular speed of the one-way clutch  425  is made the same as the angular speed of the drum shaft  121 . Further, because the reel shaft  136  is transmitted at a gear ratio of 1:1 with the reel shaft  131  via the drum gear  405 , the reel shaft  136  is rotated at the same angular speed as the reel shaft  131 . 
         [0089]    Given that the angular speed of the drum  120  is WY 1 , the angular speed of the reels  130  and  135  rotated by the tapes wound around the drum is XY 2 , and the maximum driven-rotational speed of the reel shafts  131  and  136  driven to rotate by the torque limiters  132  and  137  connected to the reels is WY 3 , because the opposite ends of the tapes are respectively wound up, the angular speeds are determined in accordance with a tape speed and a tape wound radius. Given that a tape speed is VT, then 
         [0000]        VT=WY 2 ×RA 1 and  VT=WY 1 ×RA 2, 
         [0000]        WY 2 ×RA 1 =WY 1 ×RA 2, and 
         [0000]        WY 2=( RA 2 /RA 1)× WY 1 
         [0000]      According to expressions (6) and (7), 
         [0000]        WY 2=[( ra 2 ×ka 2)/( ra 1 ×ka 1)]× WY 1.   (41) 
         [0000]    According to expressions (8) and (9), 
         [0000]        WY 2=[( ra 2 ×ka 2)/( ra 1 ×ka 1)]× WY 1&gt;[( ra 2×1)/( ra 1 ×T 1)]× WY 1, and 
         [0000]        WY 2 &gt;[ra 2/( ra 1 ×T 1)]× WY 1.   (42) 
         [0000]    Because WY 3  is determined in accordance with the angular speed WY 1  of the drum  120  and the numbers of teeth of the drum gear  416  and the reel gear  411 , 
         [0000]        WY 3=( ZA 4 /ZA 3)× WY 1.   (43) 
         [0000]    According to expression (24), because of the relationship ZA 4 /ZA 3 &lt;ra 2 /(ra 1 ×T 1 ), 
         [0000]        WY 3 &lt;[ra 2/( ra 1 ×T 1)]× WY 1.   (44) 
         [0000]    According to expressions (42) and (44), 
         [0000]        WY 3 &lt;[ra 2/( ra 1 ×T 1)]× WY 1 &lt;WY 2.   (45) 
         [0000]    The device  101 A is configured such that the reel speed WY 2  is always faster than the reel shaft speed WY 3 . 
         [0090]    Thus, the reel shafts  131  and  136  are always rotated slower in angular speed than the reels  130  and  135 , and a difference between the rotational speeds is absorbed by the torque limiters  132  and  137 . Further, at this time, as shown in  FIG. 14 , when the reel shaft  131  is rotated in the direction of arrow e 1 , the reel gear  410  is rotated, and the drum gear  405  is rotated counterclockwise which is an arrow e 2  direction. Therefore, with respect to the one-way clutch  420 , both of the drum shaft  121  and the one-way clutch  420  are rotated counterclockwise. 
         [0091]    The conditions when the one-way clutch  420  is idled and locked are the same as the one-way clutch  425  described above. Given that the rotational speed of the drum gear  405  is WY 4 , because WY 4  is determined in accordance with the angular speed WY 3  of the reel shaft  131  and the number of teeth of the drum gear  405 , 
         [0000]        WY 4=( ZA 1 /ZA 2)× WY 3.   (46) 
         [0000]    According to expression (10), 
         [0000]        ZA 1 /ZA 2 &lt;ra 1/( ra 2 ×T 2), and 
         [0000]        WY 4 &lt;[ra 1/( ra 2 ×T 2)]× WY 3.   (47) 
         [0000]    According to expression (44), a speed as WY 3  is 
         [0000]        WY 3 &lt;[ra 2/( ra 1 ×T 1)]× WY 1   (48) 
         [0000]        WY 4 &lt;[ra 1/( ra 2 ×T 2)]×[ ra 2/( ra 1 ×T 1)]× WY 1, 
         [0000]        WY 4&lt;[( ra 1 ×ra 2)]/( ra 2 ×T 2 ×ra 1 ×T 1)]× WY 1, and 
         [0000]        WY 4&lt;[1/( T 2 ×T 1)]× WY 1.   (49) 
         [0000]    According to expressions (8) and (9), because of the relationship 1&lt;T 1  and 1&lt;T 2 , the relationship (T 2 ×T 1 )&gt;1 is established. Therefore, 
         [0000]      WY4&lt;WY1.   (50) 
         [0092]    As shown in  FIG. 15 , because the angular speed e 3  of the one-way clutch  420  fixed to the drum gear  405  is slower than the angular speed e 4  of the drum shaft  121 , the relative angular speed of the one-way clutch  420  with respect to the drum shaft  121  is of the clockwise direction as shown by an arrow e 5  of  FIG. 16 , and the one-way clutch  420  is idled. 
         [0093]    Therefore, the drum gear  405  is rotated by the transmission from the reel gear  410 . However, because the drive is not transmitted to the drum shaft  121 , there is no effect on the drum  120  in storing operation. In this way, the reel shafts are rotated even in storing operation, and thus, given that the angular speed of the torque limiters in storing operation is TB 2 , then 
         [0000]        TB 2   =(angular speed of the reels)−(angular speed of the reel shafts)   (51) 
         [0000]    is formed. It is thus possible to slow down the angular speed by the amount corresponding to the rotation of the reel shafts as compared with expression (12) for the angular speed in accordance with the prior art. 
         [0094]    A comparison with the prior art will be made with reference to the specific example N 1  described earlier. Given that the angular speed of the torque limiter in feeding operation is TB 1 , and the angular speed of the torque limiter in storing operation is TB 2 , then the angular speed TB 1  of the torque limiter in feeding operation will be determined. Because the numbers of teeth ZA 1  and ZA 2  in feeding operation are the same as the prior art, 
         [0000]        TB 1(maximum value)=18.12 
         [0000]    is formed. 
         [0095]    On the other hand, to determine the angular speed TB 2  of the torque limiter in storing operation, with respect to the reels  130  and  135 , 
         [0000]      reel angular speed= VA 1 /RA 1 =VA 1/( ra 1 ×ka 1).   (52) 
         [0000]    According to expression (43), the angular speed WY 3  of the reel shafts  131  and  136  is 
         [0000]        WY 3=( ZA 4 /ZA 3)× WY 1.   (53) 
         [0000]    According to expression (24), 
         [0000]        ZA 3 /ZA 4&gt;( ra 1 ×T 1)/( ra 2×1)=(50×1.3)/80=0.813. 
         [0000]    Because of  Z A 3 /ZA 4 &gt;0.813, the gear ratio is ZA 3 /ZA 4 =0.82. 
         [0096]    According to the expression 53, 
         [0000]        WY 3=(1/0.82)× WY 1=(1/0.82)× VA 1/( ra 2 ×ka 2).   (54) 
         [0000]    According to expressions (51), (52) and (54), 
         [0000]        TB 2 =VA 1/( ra 1 ×ka 1)−[(1/0.82)× VA 1/( ra 2 ×ka 2)]= VA 1×[1/( ra 1 ×ka 1)−1/[0.82×( ra 2 ×ka 2)]]. 
         [0000]    The maximum value as TB 2  is established when (ra 1 ×ka 1 ) takes its minimum value, and (ra 2 ×ka 2 ) does its maximum value, i.e. when there are no tapes on the reels, and the tapes are fully wound on the drum. 
         [0000]    
       
         
           
             
               
                 
                   
                     TB 
                      
                     
                         
                     
                      
                     2 
                      
                     
                       ( 
                       
                         maximum 
                          
                         
                             
                         
                          
                         value 
                       
                       ) 
                     
                   
                   = 
                     
                    
                   
                     VA 
                      
                     
                         
                     
                      
                     1 
                     × 
                     
                       [ 
                       
                         
                           1 
                           / 
                           
                             ( 
                             
                               ra 
                                
                               
                                   
                               
                                
                               1 
                               × 
                               1 
                             
                             ) 
                           
                         
                         - 
                         
                           1 
                           / 
                           
                             [ 
                             
                               0.82 
                               × 
                               
                                 ( 
                                 
                                   ra 
                                    
                                   
                                       
                                   
                                    
                                   2 
                                   × 
                                   T 
                                    
                                   
                                       
                                   
                                    
                                   2 
                                 
                                 ) 
                               
                             
                             ] 
                           
                         
                       
                       ] 
                     
                   
                 
               
             
             
               
                 
                   = 
                     
                    
                   
                     1200 
                     × 
                     
                       [ 
                       
                         
                           1 
                           / 
                           50 
                         
                         - 
                         
                           1 
                            
                           
                             ( 
                             
                               0.82 
                               × 
                               80 
                               × 
                               1.5 
                             
                             ) 
                           
                         
                       
                       ] 
                     
                   
                 
               
             
             
               
                 
                   = 
                     
                    
                   11.8 
                 
               
             
           
         
       
     
         [0097]    In this way, because of the relationship TB 2 =11.8 with respect to the angular speed TA 2 =24 in the prior art represented by expression (15), it is possible to greatly slow down the angular speed in storing operation. 
         [0098]    Further, with respect to the maximum values in both storing and feeding operations, because the maximum value in the present embodiment is equal to 18.12 in feeding operation as compared with the maximum value 24 in storing operation in the prior art, it is possible to greatly slow down the maximum angular speed of the torque limiters. Moreover, in addition to the angular speed of the torque limiters, it is possible to reduce the expensive one-way clutches into two in the present embodiment, which leads to a reduction in the cost. 
         [0099]    In the illustrative embodiment described above, the power of the driving motor  140  is transmitted to the drum shaft  121  to operate the device  100 A. It is however possible to operate the media storing and feeding device by transmitting the power of the driving motor  140  to the reel sides. An alternative embodiment will be described hereinafter in which the driving force is transmitted to the reel sides. 
         [0100]      FIGS. 17 and 18  explanatorily show in a side and a plan view, respectively, the main part of a media storing and feeding device  100 B in accordance with the alternative embodiment, which may substantially be the same as the illustrative embodiment shown in and described with reference to  FIGS. 1 and 2 , except that the power of the driving motor  140  is directly transmitted to the reel gear  411 . 
         [0101]    A feeding operation of the device  100 B will be described with reference to  FIG. 19 . The reel shaft  131  is rotated in the direction of winding up the tapes, i.e. in the direction of arrow f 1  by the driving motor  140 , and the rotation is transmitted to the reel shaft  131  via the reel gear  411 . At this time, the drum gear  405  is rotated in the direction of arrow f 2  via the reel gear  410  fixed to the reel shaft  131 , and the drum gear  416  that makes drive transmission with the reel gear  141  as well is rotated in the direction of arrow f 2 . 
         [0102]    On the other hand, the reel gear  415  that makes drive transmission with the drum gear  405  is rotated in the direction of arrow f 3 . At this time, as shown in  FIG. 20 , when the reels  130  and  135  connected to the reel shafts  131  and  136  via the torque limiters  132  and  137  are rotated in the direction of arrows f 4  and f 5  which is the winding direction, the tapes  110  and  115  are wound up, and due to the tapes being wound up in the direction of arrows f 6  and f 7 , the drum  120  around which the other ends of the tapes are wound is rotated in the direction of arrow f 8 . 
         [0103]    At this time, with respect to the one-way clutch  420 , both of the one-way clutch  420  and the drum shaft  121  are rotated clockwise. As shown in  FIG. 21 , when the angular speed g 1  of the drum shaft  121  is slower than the angular speed g 2  of the one-way clutch  420 , the relative angular speed of the one-way clutch  420  with respect to the drum shaft  121  is of the clockwise rotation as shown by an arrow g 3  in  FIG. 22 , and therefore, the one-way clutch  420  is idled as shown in  FIG. 3C . 
         [0104]    As shown in  FIG. 23 , when the angular speed g 4  of the drum shaft  121  is faster than the angular speed g 5  of the one-way clutch  420 , the relative angular speed of the one-way clutch  420  with respect to the drum shaft  121  is of the counterclockwise rotation as shown by an arrow g 6  of  FIG. 24 . Therefore, the one-way clutch  420  is locked as shown in  FIG. 3D . Because of that, the drum shaft  121  is thus configured to be rotated at a speed slower than the one-way clutch  420 . 
         [0105]    Further, because the one-way clutch  425  as well has the same locking and idling directions as the one-way clutch  420 , when the angular speed of the drum shaft  121  is slower than the angular speed of the one-way clutch  425 , the one-way clutch  425  is idled. When the angular speed of the drum shaft  121  is faster than the angular speed of the one-way clutch  425 , the one-way clutch  425  is locked. Therefore, the drum shaft  121  is configured to be rotated at a speed slower than the one-way clutch  425 . 
         [0106]    Therefore, the drum shaft  121  is driven to rotate by the rotation of the reel  130 , and the rotational speed thereof is up to an angular speed at which the angular speed of the one-way clutch  420  or the one-way clutch  425  is made substantially the same as the angular speed of the drum shaft  121 . Because the drum gear  405  and the reel gears  410  and  415  satisfy expression (10), a gear ratio is set such that a speed at which the reel shafts  131  and  136  wind up the tapes is always faster than a speed at which the drum  120  rewinds the tapes even when the drum radius and the reel radii are changed by winding-up and rewinding the tapes. 
         [0107]    Further, because the drum gear  416  and the reel gear  411  satisfy the relationship represented by expression (24), a gear ratio is set such that a speed at which the reel shaft  131  winds up the tapes is always slower than a speed at which the drum  120  rewinds the tapes even when the drum radius and the reel radii are changed by winding-up and rewinding the tapes. Therefore, with respect to the driven-rotation of the drum shaft  121 , when the one-way clutch  420  is locked earlier, the speed is thereby regulated, and at that time, a speed at which the reels wind up the tapes is faster than a speed at which the drum  120  rewinds the tapes. A difference between the rotational speeds is absorbed by the torque limiters  132  and  137 . 
         [0108]    Next, a storing operation of the device  100 B will be described hereinafter with reference to  FIG. 25 . The driving motor  140  rotates the reel shaft  131  in its rewinding direction, i.e. in the direction of arrow g 7 , and the reel gear  410  and the reel gear  411  which are fixed to the reel shaft  131  are rotated clockwise, i.e. in the direction of arrow g 7 , and the drum gears  405  and  416  are rotated counterclockwise, i.e. in the direction of arrow g 8 . 
         [0109]    Further, the rotation of the reel shaft  136  is transmitted at a gear ratio of 1:1 with the reel shaft  131  via the drum gear  405 . Thus, the reel shaft  136  is rotated in the direction of arrow g 9  at an angular speed which is the same as that of the reel shaft  131 . 
         [0110]    At that time, the relationship between the drum shaft  121  and the one-way clutches  420  and  425  is as follows. As shown in  FIG. 26 , when the angular speed h 1  of the drum shaft  121  is slower than the angular speed h 2  of the one-way clutches  420  and  425 , the relative angular speed of the one-way clutches with respect to the drum shaft  121  is, as shown by an arrow h 3  of  FIG. 27 , of the counterclockwise direction. Therefore, the one-way clutch  420  is locked as shown in  FIG. 3D . 
         [0111]    As shown in  FIG. 28 , when the angular speed h 4  of the drum shaft  121  is faster than the angular speed h 5  of the one-way clutches  420  and  425 , the relative angular speed of the one-way clutches with respect to the drum shaft  121  is, as shown by an arrow h 6  of  FIG. 29 , of the clockwise direction. Therefore, the one-way clutch  420  is idled as shown in  FIG. 3C . Thus, the drum shaft  121  follows one of the one-way clutches  420  and  425  which is rotated faster, and the other one one-way clutch is idled because the drum shaft  121  is rotated faster. 
         [0112]    The driving system of the one-way clutch  420  is set to have its gear ratio such that a speed at which the drum  120  winds up the tapes is always slower than a speed at which the reel shafts  131  and  136  rewind the tapes according to expression (10), and the driving system of the one-way clutch  425  is set to have its gear ratio such that a speed at which the drum  120  winds up the tapes is always faster than a speed at which the reel shaft  131  rewinds the tapes according to expression (24). 
         [0113]    Therefore, because the one-way clutch  425  is rotated faster than the one-way clutch  420 , the drum shaft  121  follows the one one-way clutch  425 . At this time, because a speed at which the drum  120  winds up the tapes is faster than a speed at which the reels rewind the tapes, a difference between the rotational speeds is absorbed by the torque limiters  132  and  137 . 
         [0114]    The above description is directed to the drum gear  142  being rotated by the driving motor  140 . However, the invention is not limited to the specific embodiments, but it goes without saying that the drum shaft  121  and the reel shafts  131  and  136  may be directly rotated. 
         [0115]    The entire disclosure of Japanese patent application No. 2007-284264 filed on Oct. 31, 2007, including the specification, claims, accompanying drawings and abstract of the disclosure, is incorporated herein by reference in its entirety. 
         [0116]    While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.