Patent Document

CROSS REFERENCE OF RELATED APPLICATION 
     The present application is the national phase of International Application No. PCT/CN2015/070164, titled “ TEMPORARY BANKNOTE STORAGE DEVICE AND METHOD FOR IMPROVING COILING BLOCK STORAGE CAPACITY”, and filed on Jan. 6, 2015, which claims the priority to Chinese Patent Application No. 201410020452.6, titled “TEMPORARY BANKNOTE STORAGE DEVICE AND METHOD FOR IMPROVING COILING BLOCK STORAGE CAPACITY”, filed on Jan. 16, 2014 with the State Intellectual Property Office of People&#39;s Republic of China, both of which are incorporated herein by reference in their entireties. 
     FIELD 
     The present disclosure relates to a financial self-service device, and in particular to a temporary banknote storage device which stores banknotes with a reel and a tape, and to a control method for improving a reel storage capacity of a temporary banknote storage device. 
     BACKGROUND 
     Presently, a storage device having a reel/tape structure is generally used to store banknotes. The storage device includes a storage reel driven by a first power motor, a spare tape reel driven by a second power motor, and a tape, of which two ends are fixed on the storage reel and the spare tape reel respectively, and is coiled, uncoiled and winded between the storage reel and the spare tape reel. The first power motor and the second power motor are controlled to start or stop by a microcontroller. The storage device stores banknotes through the reel in cooperation with the tape. 
     Presently, banknotes are controlled to enter the storage device as follows. A third power motor drives a channel outside the device to transfer the banknotes, the device is started once the banknote is to enter the device, and a linear speed of a channel inside the device is the same as that of the channel outside the device. The banknotes successively enter the device and are bound on the storage reel by the tape, and the power motor in the device keeps operating during transferring of adjacent banknotes. The control mode has the following disadvantages. 1. A space between adjacent banknotes should not be too small due to the limitation of identifying and reversing the banknotes, and a part of the tape is occupied to meet the space between adjacent banknotes when the banknotes successively enter the device, thereby leading to a low utilization of the tape. 2. In order to meet the storage requirement, the device needs to have a certain space volume to accommodate the tape and the banknotes on the storage reel, thereby leading to a large structural space. 3. For tapes with the same length and structural spaces with the same volume, storage capacities of the devices are limited and can not be improved. 
     SUMMARY 
     In order to address the issue of low utilization of the tape in the temporary banknote storage device, a temporary banknote storage device is provided in the present disclosure. The device improves a reel storage capacity through shortening a space between two adjacent banknotes on the tape. 
     A method for improving a reel storage capacity of a temporary banknote storage device is further provided in the present disclosure. The method improves a utilization of the tape by shortening a space between two adjacent banknotes in the temporary banknote storage device, thereby improving a reel storage capacity. 
     The temporary banknote storage device includes a storage reel driven by a first power motor; a spare tape reel driven by a second power motor; a tape, of which two ends are fixed on the storage reel and the spare tape reel respectively, and is coiled, uncoiled and winded between the storage reel and the spare tape reel; a first sensor, arranged at an entrance of the temporary banknote storage device and configured to detect whether a banknote enters the temporary banknote storage device; a second sensor, arranged between the first sensor and the storage reel, being a certain distance S transfer  from the first sensor, and configured to detect whether the banknote completely enters the temporary banknote storage device; a transfer channel outside the device, arranged between the first sensor and the second sensor; a third motor, configured to drive the transfer channel outside the device, to transfer the banknote from a position of the first sensor to a position of the second sensor at a constant speed; and a microcontroller, configured to control components to operate normally, control the first power motor to start acceleratingly when the first sensor detects a front end of the banknote, and control the first power motor to stop in a deceleration way when the second sensor detects leaving of a tail end of the banknote. 
     Preferably, the microcontroller controls the first power motor to complete an accelerating start before the front end of the banknote arrives at the second sensor, and control the first power motor to transfer, after the first power motor completes the accelerating start, the banknote from the position of the second sensor until the tail end of the banknote leaves the second sensor at a same speed as that of the third power motor. 
     A method for improving a reel storage capacity of a temporary banknote storage device is provided. The method includes: step 1, driving, by a third power motor, a channel outside the device, to transfer successive banknotes from a position of a first sensor to a position of a second sensor sequentially at a constant speed v, where a space between two adjacent banknotes in the channel outside the device is L outside ; step 2, when the first sensor detects arrival of a front end of a banknote, starting acceleratingly a first power motor to drive a storage reel until a linear speed of a tape is equal to the speed v of the channel outside the device, where the first power motor already completes an accelerating start when the front end of the banknote enters the second sensor; step 3, stopping in a deceleration way the first power motor when the second sensor detects arrival of a tail end of the banknote; and step 4, transferring, through performing the step 2 and the step 3 repeatedly, the banknotes to the temporary banknote storage device during a process that the banknotes successively enter the temporary banknote storage device, where in order to control the starting and stopping of the first power motor, i.e., for two adjacent banknotes, a tail end of a first banknote already leaves the second sensor and is in a deceleration way stopped when a front end of a second banknote arrives at the first sensor, it is required L outside &gt;S transfer +2×S decelerating , where S transfer  refers to a distance between the first sensor and the second sensor, and the S decelerating  refers to a distance for the first banknote transferred during decelerating stop of the first power motor after the tail end of the first banknote leaves the second sensor. 
     Preferably, from the step 2 to the step 4, the second power motor is in a braking state during a rotation of the first power motor, and the tape is tightened through a load of the temporary banknote storage device and a braking moment of the second power motor. 
     Preferably, in the step 4, a space between two adjacent banknotes is L spacing  after the banknotes enter the temporary banknote storage device, and a method for calculating the L spacing  includes: a first step, calculating a transfer distance S decelerating  of the first banknote from the time instant when the first banknote leaves the second sensor to the time instant when the first banknote is in a deceleration way stopped, S decelerating ≈v×t decelerating /2, where a period of accelerating start for the first power motor is t accelerating , a period of decelerating stop is t decelerating , and the first banknote is already stored in the device; a second step, calculating a constant rotation speed period t constantspeed  of the first power motor before the front end of the second banknote arrives at the second sensor, t constantspeed =S transfer /v−t accelerating , where the second banknote enters the device immediately following the first banknote, the first power motor is acceleratingly started when the front end of the second banknote arrives at the first sensor, the first banknote is driven by the tape to transfer continuously in the temporary banknote storage device, the second banknote is transferred on the transfer channel outside the device which is driven by the third power motor before the front end of the second banknote arrives at the second sensor, a transfer speed of the second banknote is v, a period from a time instant when the front end of the second banknote arrives at the first sensor to a time instant when the front end of the second banknote arrives at the second sensor is S transfer /v, the first power motor already completes acceleration start and reaches a constant speed v be ore the front end of the second banknote arrives at the second sensor, and t accelerating &lt;S transfer /v; a third step, calculating a transfer distance S accelerating  of the first banknote in the device during the accelerating start of the first power motor, S accelerating ≈v×t accelerating /2, where the front end of the second banknote is transferred from the first sensor to the second sensor; a fourth step, calculating a transfer distance S constantspeed  of the first banknote during a period when the first power motor rotates at a constant speed before the front end of the second banknote arrives at the second sensor, S constantspeed =v×t constantspeed ; and a fifth step, calculating a space between the first banknote and the second banknote in the temporary banknote storage device, 
     
       
         
           
             
               
                 
                   
                     L 
                     spacing 
                   
                   = 
                     
                   ⁢ 
                   
                     
                       S 
                       decelerating 
                     
                     + 
                     
                       S 
                       accelerating 
                     
                     + 
                     
                       S 
                       constantspeed 
                     
                   
                 
               
             
             
               
                 
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                       v 
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                           t 
                           decelerating 
                         
                         / 
                         2 
                       
                     
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                           t 
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                         2 
                       
                     
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                       v 
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                         t 
                         constantspeed 
                       
                     
                   
                 
               
             
             
               
                 
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                       S 
                       transfer 
                     
                     - 
                     
                       v 
                       × 
                       
                         
                           t 
                           accelerating 
                         
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                         2 
                       
                     
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                       v 
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                           t 
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                         2 
                       
                     
                   
                 
               
             
             
               
                 
                   
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                         S 
                         transfer 
                       
                       - 
                       
                         S 
                         accelerating 
                       
                       + 
                       
                         S 
                         decelerating 
                       
                     
                   
                   , 
                 
               
             
           
         
       
     
     where t accelerating &lt;S transfer /v, the second banknote gradually enters the temporary banknote storage device after the front end of the second banknote arrives at the second sensor, and reaches a same transfer speed as the first banknote, and the space between the first banknote and the second banknote remains constant. 
     Preferably, during a process that the banknotes successively enter the temporary banknote storage device and are bound on the storage tape by the tape, an outer diameter of the storage reel increases continuously. In a condition of a constant operation speed v of the tape, a target rotation speed of the first power motor decreases as a radius increases, and different motor starting curves are adopted depending on different outer diameters of the storage reel, so that a starting period t accelerating  of the first power motor for arriving at the target rotation speed is approximately a constant value for each banknote during changes of the outer diameter of the storage reel. 
     Based on the temporary banknote storage device in the present disclosure, a space between two adjacent banknotes in the temporary banknote storage device is less than a space between the two adjacent banknotes outside the device with the method for controlling the starting or stopping, thereby increasing a utilization of the tape and the structural space, and improving a storage capacity of the device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view of a structure of a temporary banknote storage device according to a preferable embodiment of the present disclosure; 
         FIG. 2  is a v-t diagram showing a constant speed operation of a channel outside the device; 
         FIG. 3  is a v-t diagram showing starting or stopping operation of a channel inside the device; 
         FIG. 4  is a v-t diagram showing a constant speed control for banknotes; 
         FIG. 5  is a v-t diagram showing start-stop control for banknotes; and 
         FIG. 6  is a w-t diagram showing start control for a first power motor. 
     
    
    
     DETAILED DESCRIPTION 
     In order to further clarify the temporary banknote storage device of the present disclosure, hereinafter the temporary banknote storage device is described in detail in conjunction with drawings of a preferable embodiment of the present disclosure. 
       FIG. 1  is a side view of a temporary banknote storage device  100  of the present disclosure. The temporary banknote storage device  100  includes a first sensor  102 , a second sensor  103 , a storage reel  104 , a spare tape reel  107 , a tape  105  of which two ends are fixed on the storage reel  104  and the spare tape reel  107  respectively and is coiled, uncoiled and winded between the storage reel  104  and the spare tape reel  107 , a transfer channel  101 , a first power motor  109 , a second power motor  110 , a third power motor  111  and a microcontroller  106 . The transfer channel  101  includes two segments. A first segment is a channel outside the device between the first sensor  102  and the second sensor  103  on the transfer channel  101 , and is driven and controlled by the third power motor  111 . A second segment is between the second sensor  103  and the storage reel  104  on the transfer channel  101 , and is driven and controlled by the first power motor  109  via the tape  105 . The microcontroller  106  controls the first power motor  109 , the second power motor  110  and the third power motor  111 . Specifically, the first power motor  109  drives the storage reel  104 , the second power motor  110  drives the spare tape reel  107  and the third power motor drives the channel outside the device between the first sensor  102  and the second sensor  103 . A banknote  108  enters the temporary banknote storage device  100  through the transfer channel  101  and is stored on the storage reel  104  through the tape  105 . The first sensor  102  detects whether the banknote  108  enters the temporary banknote storage device  100 , based on whether the first sensor  102  detects a front end of the banknote. The second sensor  103  is configured to detect whether the banknote completely enters the temporary banknote storage device  100 , based on whether a tail end of the banknote leaves the second sensor  103 . 
     A principle for controlling a banknote to enter the temporary banknote storage device  100  is illustrated in conjunction with  FIG. 1 ,  FIG. 2  and  FIG. 3 . 
     The banknote  108  enters the temporary banknote storage device  100  along the transfer channel  101 . When entering the temporary banknote storage device  100 , the banknote  108  firstly passes through the channel outside the device, i.e., the first segment of the transfer channel  101 . As shown in  FIG. 2 , in the first segment of the transfer channel  101 , the banknote  108  is transferred at a constant speed V constantspeed . When a front end of the banknote  108  arrives at the first sensor  102 , the first power motor  109  acceleratingly starts; and before the front end of the banknote  108  arrives at the second sensor  103 , the first power motor  109  already completes accelerating start and reaches a speed V constantspeed , such that the banknote  108  is transferred in the second segment of the transfer channel  101  at a same linear speed as that in the first segment, to enter the temporary banknote storage device  100 . In a case that the tail end of the banknote  108  leaves the second sensor  103 , it is indicated that the banknote  108  completely enters the temporary banknote storage device  100 , and at this time the first power motor  109  in a deceleration way stops. In this way, one banknote is controlled to enter the temporary banknote storage device  100 . During a process that banknotes are successively transferred to the temporary banknote storage device  100  through the channel outside the device, the first power motor  109  is controlled by the microcontroller  106  to start and stop repeatedly to transfer the banknotes to the temporary banknote storage device  100  one by one, as shown in  FIG. 3 . 
     A principle for controlling a space between adjacent banknotes in the device is illustrated in conjunction with  FIG. 1 ,  FIG. 4  and  FIG. 5 . 
     Hereinafter the principle for controlling the space between adjacent banknotes in the temporary banknote storage device  100  is described with an example that two successive banknotes enter the temporary banknote storage device  100 . It is assumed that, a space between two banknotes in the channel outside the device is L outside , a space between the first sensor  102  and the second sensor  103  is S transfer , and a space between adjacent banknotes  108  in the device is L spacing . 
     After a first banknote enters the temporary banknote storage device  100  through the channel outside the device, a tail end of the first banknote leaves the second sensor  103  driven by the first power motor  109 , and then the first banknote in a deceleration way stops in the temporary banknote storage device  100 . A period for decelerating stop is t decelerating , and the first banknote is transferred for a distance S decelerating  during the decelerating process. In order to transfer banknotes to the temporary banknote storage device  100  one by one through start-stop control from first power motor  109 , it is required that a front end of a second banknote arrives at the first sensor  102  after the first banknote is in a deceleration way stopped in the temporary banknote storage device  100 . 
     When the front end of the second banknote arrives at the first sensor  102 , the first power motor  109  is acceleratingly started. As shown in  FIG. 5 , a period for accelerating start is t accelerating , and the first banknote is transferred for a distance S accelerating  in the temporary banknote storage device  100  driven by the first power motor during the accelerating start of the first power motor. 
     Subsequently, the second banknote is transferred to the temporary banknote storage device  100  continuously along the transfer channel  101 . From a time instant when the front end of the second banknote arrives at the first sensor  102  to a time instant when the front end of the second banknote arrives at the second sensor  103  driven by the third power motor, the first power motor  109  completes accelerating start, operates for a period t constantspeed  at a constant speed v constantspeed , and drives the first banknote to transfer for a distance S constantspeed  in the temporary banknote storage device  100  at the constant speed. 
     After the front end of the second banknote arrives at the second sensor  103 , a speed of the first power motor  109  reaches the constant speed v constantspeed , and the second banknote enters the temporary banknote storage device  100  at the same speed v constantspeed  as that of the first banknote. When the tail end of the second banknote leaves the second sensor  103 , the second banknote already gets out of power of the channel outside the device and enters the temporary banknote storage device  100  completely, the first power motor  109  is in a deceleration way stopped, a period for decelerating stop is t decelerating , and the second banknote is also transferred for the distance S decelerating  in the temporary banknote storage device  100 . In this way, the second banknote smoothly enters the temporary banknote storage device  100  and the space between the second banknote and the first banknote is determined. That is, after the front end of the second banknote arrives at the second sensor  103 , the second banknote enters the temporary banknote storage device  100  at the same speed as that of the first banknote, including a constant speed phase and a decelerating phase. After the second banknote completely enters the temporary banknote storage device  100  and is in a deceleration way stopped, there is no relative motion between the second banknote and the first banknote regardless of start-stop driving of the first power motor, and hence the space between the two adjacent banknotes is determined. 
     Hereinafter a method for calculating the space L spacing  between adjacent banknotes in the device is illustrated in detail. 
     During a process that the second banknote enters the temporary banknote storage device  100 , the first banknote and the second banknote are transferred at the same speed when the front end of the second banknote arrives at the second sensor  103 , and hence the space L spacing  between two banknotes in the device is equal to a sum of a transfer distance S decelerating  of the first banknote during a process that the tail end of the first banknote leaves the second sensor  103  and is in a deceleration way stopped after the first banknote enters the temporary banknote storage device  100 , a transfer distance S accelerating  of the first banknote in the device during accelerating start of the first power motor, and a constant speed transfer distance S constantspeed  of the first banknote driven by the first power motor before the front end of the second banknote arrives at the second sensor  103 , i.e.,
 
 L   spacing   =S   decelerating   +S   accelerating   +S   constantspeed .
 
     In a case that a period for accelerating start of the first power motor  109  is t accelerating , the transfer distance of the first banknote may be approximately given as:
 
 S   accelerating   ≈v   constantspeed   ×t   accelerating /2
 
(an error is small, and the acceleration motion may be regarded as a uniform acceleration motion approximately).
 
     In a case that the first power motor  109  rotates at a constant speed for a time period t constantspeed  before the front end of the second banknote arrives at the second sensor  103 , the transfer distance S constantspeed  of the first banknote is given as:
 
 S   constantspeed   =v   constantspeed   ×t   constantspeed .
 
     In a case that a period for decelerating stop of the first power motor  109  is t decelerating , the transfer distance S decelerating  of the first banknote during a process that the tail end of the first banknote leaves the second sensor  103  and is in a deceleration way stopped may be approximately given as:
 
 S   decelerating   ≈v   constantspeed   ×t   decelerating /2
 
(an error is small, and the acceleration motion may be regarded as a uniform acceleration motion approximately).
 
     In a design, the period t accelerating  for accelerating start and the period t decelerating  for decelerating stop of the first power motor  109  are known. As shown in  FIG. 4 , during a period from a time instant when the front end of the second banknote arrives at the first sensor  102  to a time instant when the front end of the second banknote arrives at the second sensor  103 , the second banknote is transferred for a distance S transfer . Since the second banknote is driven by the third power motor at a constant speed V constantspeed , a period for the transfer process is t 0 =S transfer /v constantspeed . In addition, the transfer period t 0  for the second banknote during the process is equal to a sum of the period t accelerating  for accelerating start of the first banknote and the constant speed transfer period t constantspeed  for the first banknote in the temporary banknote storage device  100 , therefore, the constant speed transfer period t constantspeed  of the first banknote may be given as:
 
 t   constantspeed   =S   transfer   /v   constantspeed   −t   accelerating .
 
     The constant speed transfer distance S constantspeed  of the first banknote is given as:
 
 S   constantspeed   =v   constantspeed   ×t   constantspeed   =v   constantspeed ×( S   transfer   /v   constantspeed   −t   accelerating )=( S   transfer   −v   constantspeed   ×t   constantspeed .
 
     The space L spacing  between adjacent banknotes in the temporary banknote storage device  100  may be given as: 
     
       
         
           
             
               
                 
                   
                     L 
                     spacing 
                   
                   = 
                     
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                       S 
                       accelerating 
                     
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                       S 
                       decelerating 
                     
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                       S 
                       constantspeed 
                     
                   
                 
               
             
             
               
                 
                   = 
                     
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                       S 
                       transfer 
                     
                     - 
                     
                       
                         v 
                         constantspeed 
                       
                       × 
                       
                         
                           t 
                           accelerating 
                         
                         / 
                         2 
                       
                     
                     + 
                     
                       
                         v 
                         constantspeed 
                       
                       × 
                       
                         
                           t 
                           accelerating 
                         
                         / 
                         2. 
                       
                     
                   
                 
               
             
           
         
       
     
     Therefore, a relation of a design space S transfer  between the first sensor  102  and the second sensor  103 , with the L spacing  between adjacent banknotes in the temporary banknote storage device  100  may be given as:
 
 S   transfer   =L   spacing   +v   constantspeed   ×t   accelerating /2− v   constantspeed   ×t   accelerating /2.
 
     The control process should meet two requirements as follows. 
     A first requirement is that the first power motor  109  completes accelerating start before the front end of the second banknote arrives at the second sensor  103 , i.e.,
 
 t   accelerating   &lt;S   transfer   /v   constantspeed .
 
     A second requirement is that the first banknote leaves the second sensor  103  and is in a deceleration way stopped when the second banknote arrives at the first sensor  102 , i.e., the S transfer  and the L spacing  should meet:
 
 L   outside   &gt;S   transfer   +v   constantspeed   ×t   accelerating .
 
     Based on a relationship between the S transfer  and L spacing , and based on the two requirements, a position of the first sensor  102  can be determined, so as to decrease the space between adjacent banknotes in the temporary banknote storage device  100 . 
     Hereinafter it is illustrated in conjunction with an actual control. 
     For the actual control, a space between adjacent banknotes in the channel outside the device is L outside =90 mm, the space L spacing  between adjacent banknotes in the temporary banknote storage device  100  is controlled to be L spacing =30 mm, and the transfer speed of the channel outside the device is V constantspeed =0.8 mm/ms. For the first power motor  109 , the period for accelerating start is t accelerating =50 ms, and the period for decelerating stop is t decelerating =10 ms.
 
 S   transfer   =L   spacing   +v   constantspeed   ×t   accelerating /2− v   constantspeed   ×t   decelerating /2=46 mm.
 
     A first detection condition is (t accelerating =50 ms)&lt;(S transfer /V constantspeed =57.5 ms). 
     A second detection condition is:
 
( L   outside =90 mm)&gt;( S   transfer   +v   constantspeed   ×t   decelerating =54 mm).
 
     The two conditions are met, hence the distance between the first sensor  102  and the second sensor  103  may be designed as S transfer =46 mm, the space between adjacent banknotes in the temporary banknote storage device  100  may be controlled to be L spacing =30 mm, and the space between adjacent banknotes in the device is 60 mm less than the space between adjacent banknotes in the channel outside the device, thereby greatly reducing the use of the tape and a structural space in the temporary banknote storage device and improving the storage capacity of the device. 
     A design principle of the period t accelerating  for start and the period t decelerating  for decelerating stop of the first power motor  109  is described in conjunction with  FIG. 1  and  FIG. 6 . 
     During a process that banknotes  108  enter the temporary banknote storage device  100  and are stored on the storage reel  104  one by one, an outer diameter of the storage reel  104  increases continuously. In a condition that the constant operation speed of the transfer channel is V constantspeed , a target rotation speed of the first power motor  109  needs to be decreased as a radius increases. 
     In the solution, different motor starting curves are adopted depending on different radiuses of the storage reel  104 , to control the period t accelerating  for accelerating start of the first power motor  109  to be a constant value. As shown in  FIG. 6 , 6 acceleration curves are adopted during the control (more acceleration curves may be adopted as needed). During a process that a rotation speed of the storage reel  104  is changed from w 1  to w 6 , the outer diameter of the storage reel  104  increases accordingly, and periods for accelerating to the constant speed V constantspeed  are t accelerating  for all the 6 curves. During the control, the microprocessor  106  selects different acceleration curves for the first power motor  109  based on the number of banknotes  108  entering the temporary banknote storage device  100 . During the actual control, the microprocessor  106  changes the acceleration curve every 50 banknotes (the number may be set based on the actual case) based on a count in the second sensor  13 . 50 banknotes enter the temporary banknote storage device  100 , the outer diameter of the storage reel  109  changes little, and hence the period for accelerating start for the first power motor  109  during a process that the 50 banknotes enter the temporary banknote storage device  100  may be approximately t decelerating . 
     Since the first power motor  109  is in a deceleration way stopped quickly, the period t decelerating  for decelerating stop changes little during decelerating stop processes for different target rotation speeds and may be approximately a constant value. 
     The period t accelerating  for start and the period t decelerating  for decelerating stop for the first power motor  109  can be determined based on the control method described above. 
     Only the preferable embodiments of the present disclosure are described above. It should be noted that the preferable embodiments are not intended to limit the present disclosure, and the scope of protection of the present disclosure should be based on the claims. Improvements and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and the improvements and modifications are regarded as falling within the scope of protection of the present disclosure.

Technology Category: 7