BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a coin dispensing method and a coin dispensing device for rapidly dispensing coins, one by one, even when only small numbers of coins are retained in a coin hopper and more particularly to a method of driving a rotary disc under certain monitored conditions. Also the present invention relates to a compact coin recycling machine capable of rapidly dispensing coins. 
         [0003]    2. Description of Related Art 
         [0004]    There are known coin dispensing devices for separating and dispensing coins one by one by a rotary disc, wherein a rod-like elastic or spring member is arranged so as to dispense the coins above the rotary disc, see Japanese Publication 2004-70660 A. 
         [0005]    There is also known a coin dispensing device for separating and dispensing coins one by one by a rotary disc, wherein coins are flipped with momentum by a coin runner and caused to stack dispersively in a hopper with this momentum in order to prevent the dropping coins from angularly stacking in the coin retaining hopper as shown in Japanese Publication 9-180020 A. 
         [0006]    A coin dispensing device for separating and dispensing coins one by one by a feeding circular disc, wherein when a specified number of coins are received, the feeding circular disc is reversely rotated for stirring and thereby flattening the retained coins, in order to prevent the dropping coins from angularly stacking in the coin retaining hopper and reducing the retained number of coins is known in Japanese Publication 8-110960 A. 
         [0007]    Finally, Japanese Publication 2000-76507 A discloses a rotary disc for dispensing coins driven by a inner-rotor brushless DC motor, and stopped by application of an electric brake as shown in Japanese Publication 2000-76507 A which merely discloses rotating, reversely rotating, or stopping the rotary disc by driving it with the DC brushless motor, but not discloses any motivation of causing the remaining coins to be mounted in the receiver of the rotary disc. 
         [0008]    If the rotary disc is aslant, a coin will be latched by the rotary disc in a lowermost position. For this reason, a distal end of the rod-like elastic member should be located in that lowermost position. In this case, since the rod-like elastic member is deformed by the rotary disc into a narrower space from a wider space, it cannot recover the original form once it is deformed. Furthermore, since this rod-like elastic member is caused to return by utilizing its own elasticity, it should be longer than a certain length. Therefore, the rod-like elastic member may not be applicable in a small coin dispensing device in which a rotary disc is arranged aslant. 
         [0009]    When a coin runner is used it is difficult to design a miniaturization of the coin dispensing device. 
         [0010]    When the remaining number of coins in the hopper is small (one or two coins are remaining), the rotary disc does not always receive coins quickly in a receiver, for example, due to the coins jumping up randomly by rotation of the rotary disc. In such a case, there arises a problem that a specified number of coins cannot be dispensed quickly. When the rotary disc is rotated reversely for quickly receiving coins in the receiver, the coins may be located in the receiver of the rotary disc without dispensing the same. However, since the stacking number of coins triggers the reverse rotation, too small number of remaining coins cannot trigger the reverse rotation of the rotary disc as described above. 
       SUMMARY OF THE INVENTION 
       [0011]    A first object of the present invention is to provide a coin dispensing method and device capable of quickly dispensing a coin when the remaining amount of coins in a storing bowl is small. 
         [0012]    A second object of the present invention is to provide a coin dispensing method and device capable of effectively using a full retaining capacity of a coin storing bowl. 
         [0013]    A third object of the present invention is to provide a coin recycling machine capable of quickly dispensing a specified number of specified coins. 
         [0014]    In order to achieve these objects, the present invention is configured as follows. 
         [0015]    A coin dispensing method is carried out in a coin dispensing device, which can separate and dispense coins one by one by rotation of a rotary disc in a first or forward direction. The rotary disc can be stopped after dispensing a specified number of coins, and rotated in a second or reverse direction opposite to the forward direction by at least one rotation after the rotary disc stops. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]    The objects and features of the present invention, which are believed to be novel, are set forth with particularity in the appended claims. The present invention, both as to its organization and manner of operation, together with further objects and advantages, may best be understood by reference to the following description, taken in connection with the accompanying drawings. 
           [0017]      FIG. 1  is a schematic view of a coin dispensing device for carrying out a coin dispensing method of the first embodiment of the present invention. 
           [0018]      FIG. 2  are a perspective view, a plan view, a left side view, a section view along the line X-X, a front view in which a storing bowl is removed, and a section view along the line Y-Y of a coin dispensing device suited for carrying out the coin dispensing method of the first embodiment of the present invention. 
           [0019]      FIG. 3  is a flowchart of a coin dispensing method of the first embodiment of the present invention. 
           [0020]      FIG. 4  is a schematic view of a coin dispensing device for carrying out a coin dispensing method of a second embodiment of the present invention. 
           [0021]      FIG. 5  is a flowchart of a coin dispensing method. 
           [0022]      FIG. 6  is a block diagram and a flowchart for carrying out a coin dispensing method of the third embodiment of the present invention. 
           [0023]      FIG. 7  is a schematic view of a coin recycling device for carrying out a coin dispensing method of a forth embodiment of the present invention. 
           [0024]      FIG. 8  is a block diagram of a coin recycling device for carrying out the coin dispensing method of a forth embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0025]    Reference will now be made in detail to the preferred embodiments of the invention which set forth the best modes contemplated to carry out the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the preferred embodiments, it will be understood that they are not intended to limit the invention to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be obvious to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present invention. 
         [0026]    The terminology “coin” as used in the present invention includes medallions, tokens, and other articles in addition to monetary coins that can be stored in bulk and dispensed through a guide passageway. 
         [0027]    The rotary disc can rotate in the forward direction and dispense coins one by one. When a specified number of coins are dispensed, the rotary disc is stopped, and immediately after completion of the dispensing, the rotary disc is rotated by at least one rotation in the reverse direction. When the rotary disc is reversely rotated by at least one rotation, the coins are stirred by the receiver or the like of the rotary disc, but not dispensed. When the coins are stirred, the coins are changed into various positions, so that they are more likely to be received to the receiver of the rotary disc. At least one reverse rotation of the rotary disc is conducted whenever a dispense of coins is completed. Therefore, the coins are more likely to be positioned in the receiver by the at least one reverse rotation after completion of a coin dispense, which is advantageous in that coins can be quickly dispensed in the next dispense cycle. Further, since the coins are angularly stacked, the coins will be stirred by the at least one reverse rotation after the coin dispense, and the stacked coins are flattened. This is advantageous in that the coins can be retained with best use of the retaining capacity of the storing bowl for retaining coins. 
         [0028]    A coin dispensing method is carried out in a coin dispensing device, comprising: separating and dispensing coins one by one by forward rotation of a rotary disc provided in a bottom part of a storing bowl by rotating the rotary disc in a forward direction; and stopping the rotary disc by stop units after dispensing a specified number of coins, the method further comprising: when the rotary disc stops, rotating the rotary disc in a direction opposite to the forward direction by at least one rotation, and when the coins input to the storing bowl reaches a specified number, rotating the rotary disc in the reverse direction by a predetermined amount. 
         [0029]    In this method, when the number of newly received coins in the storing bowl reaches a specified or predetermined number, the rotary disc is reversely rotated by at least one rotation. When the rotary disc is reversely rotated by at least one rotation, the retained coins are stirred and the angularly stacking coins are leveled and uniformed. Accordingly, the coins, angularly stacked, due to acceptance of predetermined amount of money during a period in which no coin dispense is executed are leveled and flattened by at least one reverse rotation of the rotary disc. Therefore, the coins can be retained with maximum use of the retaining capacity of the storing bowl for retaining coins. 
         [0030]    A reverse rotation amount when the rotary disc stops can be within a range of one rotation to ten rotations. In this configuration, when a small amount of coins are retained in the storing bowl, a stirring effect due to rotation of the rotary disc extends over the whole retained coins even if the rotation amount is small. 
         [0031]    When a large amount of coins are retained in the storing bowl, the stirring effect does not extend over coins in an upper portion within the storing bowl when the rotation amount of the rotary disc is small, so that a more rotation amount may be required. 
         [0032]    However, when a more reverse rotation amount at a stop time is set and the next dispense instruction signal is immediately outputted, dispense of the next coin is delayed, so that the reverse rotation amount is limited to at most ten rotations. Therefore, it is preferable that the reverse rotation amount at the stop time of the rotary disc is within a range of one rotation to ten rotations. 
         [0033]    According to an experiment, when about 100 one-euro coins are retained, it is preferable that the reverse rotation amount is within a range of two rotations to ten rotations. 
         [0034]    According to an experiment, when a retaining capacity of the storing bowl is small, when about 50 one-euro coins are retained, it is preferable that the reverse rotation amount is within a range of one rotation to five rotations. 
         [0035]    According to an experiment, when all coins from one cent coin to two-euro coin are applied with the same setting, it is preferable that the reverse rotation amount is set to two rotations to five rotations. Therefore, when the same setting is applied to all euro coins, it is preferable that the reverse rotation amount is in a range of two rotations to five rotations. 
         [0036]    A coin dispensing device including a reverse rotation unit that rotates the motor in a reverse direction to cause the rotary disc to rotate in a direction opposite to the forward direction within a range of two rotations to five rotations when the rotary disc stops. 
         [0037]    According to an experiment, when all coins, from a one-cent coin to a two-euro coin, are applied with the same setting, it is preferable that the reverse rotation amount is set to two rotations to five rotations. 
         [0038]    Therefore, it is preferable that the reverse rotation unit reversely rotates the rotary disc by two rotations to five rotations when the rotary disc stops. 
         [0039]    Since the motor can be a brushless DC motor, when an electric brake is employed as a stop unit, a rotary force in the direction opposite to the dispensing direction is applied to cause a sudden stop for preventing the next coin from being dispensed. When the power supply is blocked after that sudden stop, the rotor continues to rotate reversely by the inertial force, and then completely stops. This inertial reverse rotation achieves reverse rotation after a stop, so that an advantage of energy reduction is realized. Furthermore, since a special braking device is required, it is possible to miniaturize the device and to reduce the costs. 
         [0040]    A coin recycling machine is provided wherein coins are retained by denomination in a coin dispensing device and a specified number of specified denomination of coins are dispensed according to a dispense instruction, the coin dispensing device separating coins inputted to a coin receiver by specified denominations in the course of conveyance on a predetermined path, retaining the coins in bulk and dispensing coins one by one, the coin recycling machine comprising: coin dispensing devices having a reverse rotation unit that reversely rotates the rotary disc by at least one rotation after separating and dispending a specified number of coins one by one by the rotary disc; money acceptance detectors for detecting money acceptance to the coin dispensing device; money dispense detectors for detecting money dispense from the coin dispensing devices; a stacking amount detector for calculating a coin retaining amount based on at least a signal of the money acceptance detector; and a controller for actuating the reverse rotation unit when an accepted money number based on the money acceptance detector reaches a specified number. 
         [0041]    In this configuration, the coins input into the coin dispensing device are separated by denomination during conveyance on a predetermined path, and retained in coin dispensing devices of individual denominations. 
         [0042]    At the time of retaining, the coins are detected by the money acceptance detector. On the other hand, the coin dispensing device dispenses, based on a money dispense instruction, a specified number of coins one by one by forward rotation of the rotary disc. The money dispense detector detects a coin whenever the coin is dispensed, and sends the detection to the stacking amount detector. When a specified number of coins are dispensed, the rotary disc is stopped by the stop unit to end the dispense. When the rotary disc stops, the rotary disc is reversely rotated by at least one rotation by the reverse rotation unit. When the rotary disc is reversely rotated, the coins are stirred by the receiver or the like of the rotary disc, but no coins are dispensed. 
         [0043]    When the coins are stirred, the coins are changed into various positions, so that they are more likely to be received to the receiver of the rotary disc. The reverse rotation of the rotary disc is conducted whenever a dispense of coins is completed. Therefore, the coins are more likely to be positioned in the receiver by the reverse rotation after completion of a coin dispense, which is advantageous in that coins can be quickly dispensed in the next dispense. 
         [0044]    Further, when the coins angularly stack, the coins will be stirred by the reverse rotation after the coin dispense, and the stacked coins are flattened. 
         [0045]    Furthermore, the stacking amount detector sends a reverse rotation signal to the reverse rotation unit of the coin dispensing device at least when the accepted number of coins from the money acceptance detector reaches a specified number, and reversely rotates the rotary disc by a predetermined amount. As a result, the coins are stirred and the angularly stacking coins that are newly input are leveled and flattened. In this manner, the coins that are newly input and angularly stacking are leveled, so that it is possible to retain the coins with the best use of the retaining capacity of the coin storing bowl. 
         [0046]    In this configuration, since the amount of reverse rotation of the rotary disc may be appropriately selected depending on the coin size and the capacity of the storing bowl, an advantage arises that the capacity of the storing bowl may be used at most with least energy consumption. 
         [0047]    A coin dispensing method carried out in a coin dispensing device, comprising: separating and dispensing coins one by one by rotation of a rotary disc by rotating a rotary disc in a forward direction; and stopping the rotary disc by stop units after dispensing a specified number of coins, the method further comprising: rotating the rotary disc in a direction opposite to the forward direction by at least one rotation when the rotary disc stops. 
         [0048]    A first embodiment will be explained with reference to  FIGS. 1 to 3 . 
         [0049]    A coin dispensing device  100  separates and dispenses retained coins  102  one by one, and includes a hopper  104  and a controller  106 . 
         [0050]    The hopper  104  includes a tubular storing bowl  108  for retaining coins  102 , a rotary disc  110  disposed in the bottom of the storing bowl  108  for separating coins  102  one by one, a base  112  of flat plate on which coins  102  slide while accompanying the rotary disc  110 , a motor  114  for rotationally driving the rotary disc  110 , and a dispenser  116  for flipping out a coin  102 . 
         [0051]    The dispenser  116  includes a stationary roller  118  disposed such that its one side is in a stationary state with respect to the base  112 , and a movable roller  120  disposed to be movable with respect to the base  112  and biased to approach the stationary roller  118 . A coin  102  will be swiftly flipped by a biasing force of the movable roller  120  after its diametrical extent has passed through the rollers. 
         [0052]    The motor  114  may be implemented by, an electric motor, air motor, oil motor and the like, however, an electric motor is the most preferable because of its easiness of control. Such electric motor may be energized by DC power supply or AC power supply, and may employ various motor systems such as induction motor, however, from the view points of miniaturization, maintenance and durability, a brushless DC motor is preferred. 
         [0053]    The controller  106  includes a money dispense detector  122  for detecting a coin  102  dispensed one by one by rotation of the rotary disc  106 , and a control unit  124  that selectively control the motor  114  to forwardly rotate, reversely rotate, or stop in response to an externally given instruction for coin dispense or a detection signal CU from the money dispense detector  122 . 
         [0054]    The control unit  124  includes a main control unit  126 , a forward rotation unit  128 , a stop unit  130  and a reverse rotation unit  132 . The money dispense detector  122  detects a coin  102  dispensed by the dispenser  116 , and outputs a detection signal CU to the control unit  124 . The money dispense detector  122  may be a contact system that detects a coin  102  in a contacting manner, or a non-contact system that detects a coin  102  in a non-contacting manner, however, a non-contact system is preferably used from the view points of durability and maintenance. 
         [0055]    The main control unit  126  receives a dispense instruction from an external device and a detection signal CU from the money dispense detector  122 , executes a predetermine processing, and outputs respective operation signals at predetermined timings to the forward rotation unit  128 , the stop unit  130  and the reverse rotation unit  132 . Therefore, the main control unit  126  may be implemented by a logic circuit or a microprocessor, however, from the view point of miniaturization and easiness of modification, a microprocessor system that executes a predetermined processing based on a program stored in a ROM is preferably used. 
         [0056]    Upon reception of a forward rotation signal NS from the main control unit  126 , the forward rotation unit  128  forwardly rotates the motor  114 . In the first embodiment, the forward rotation is a rotation in the counterclockwise direction in  FIGS. 1 and 2 . An output axis  134  of the motor  114  forwardly rotates the rotary disc  110  via a reducer  136  ( FIG. 2 ). 
         [0057]    Upon reception of a stop signal SS from the control unit  124 , the stop unit  130  stops the motor  114 . The term “stop” used herein refers to applying an electric brake to the motor  114  by blocking or shorting the power supply, and stopping rotation of the output axis  134  of the motor  114  by making a braking unit (not shown) have an effect on the rotary disc  110  while blocking the power supply of the motor  114 , and the stop unit  130  stops the rotary disc  110  either directly or indirectly. 
         [0058]    Upon reception of a reverse rotation signal CS from the control unit  124 , the reverse rotation unit  132  rotates the motor  114  in the direction opposite to that of the forward rotation to make the rotary disc  110  reversely rotate. Therefore, causing the motor  114  to generate a reverse rotary force by the reverse rotation unit  132  during forward rotation of the motor  114  also serves as the brake as described above. 
         [0059]    In other words, the reverse rotation unit  132  can also serve as the stop unit  130 . In this case, the forward rotation, the stop, and the reverse rotation are conducted in a series of acts, where there is such a case that a step where the rotary disc is stopped after forwardly rotated and a step where the rotary disc is reversely rotated are clearly distinguished from each other. 
         [0060]    However, even if the steps are not distinguished from each other clearly, since the operation includes the steps of forward rotation, the stop, and the reverse rotation microscopically, such a case is also included in the technical scope of the present invention. 
         [0061]    Next, a preferred embodiment of the coin dispensing device  100  will be explained with reference to  FIG. 2 . The same functional parts as those shown in  FIG. 1  are denoted by the same numerals, and explanation will be made only for different configuration. 
         [0062]    The base  112  is fixed to a frame  140 , and inclined at an angle ranging from about 30 degrees to 40 degrees. The storing bowl  108  is detachably attached to the base  112 . The rotary disc  110  is rotatably attached to a circular hole on the bottom of the storing bowl  108 . The dispenser  116  is disposed right beside the rotary disc  110 . 
         [0063]    The money dispense detector  122  is fixed to the base  112  beside the dispenser  116 . The motor  114  is placed in an interior space of the frame  140 . The base  112  has a boxy shape and accommodates a reducing mechanism  142  or the like in the interior space. The base  112  is fixed to a slope part of the frame  140  which is a right triangle when viewed laterally, and is inclined at about 30 degrees. 
         [0064]    The smaller the angle of inclination, the more preferable because the coin retaining capacity of the storing bowl  108  increases. However, the minimum angle of inclination is about 30 degrees because influence of diameter of the rotary disc  110  on the hopper  104  increases at smaller angles, and the maximum angle of inclination is about 60 degrees because efficiency of coin dispense is deteriorated at larger angles. 
         [0065]    To a top face of the base  112 , the storing bowl  108  of a cylinder form is detachably fixed. The storing bowl  108  has a circular hole  144  in its lower part, and an upper opening  146  formed into a general rectangular shape for increasing the coin retaining capacity. 
         [0066]    The rotary disc  110  has a plurality of through-holes  148  arranged at predetermined intervals, a stirrer  150  of conical shape in the center of the top face, a chevron stirring projection  152  disposed near the periphery, and a coin pusher  154  on its bottom face. The coin dropping into the through-hole  148  is held by a top face  156  of the base  112 , and in a forward condition, rotated in a counterclockwise direction together with the rotary disc  110  by the pusher  154  of the rotary disc  110  while the periphery thereof is guided by the circular hole  144 . 
         [0067]    Since this coin is prevented from moving by pins  158 ,  160  projecting in predetermined positions on the top face of the base  112 , it is pushed out in the circumferential direction of the rotary disc  110 . Since the circular hole  144  is notched, and a dispensing opening  162  is provided in this position, the pushed out coin  102  is allowed to move outside the storing bowl  108 . 
         [0068]    In this dispensing opening  162 , the dispenser  116  consisting of the stationary roller  118  and the movable roller  120  is disposed. In the dispenser  116 , the movable roller  120  is rotatably attached to a tip end of a lever  166  that is pivotably attached to a stationary axis  164 , and the lever  166  is biased by a string wound spring  168  so as to approach the rotary disc  110 . The lever  166  is latched by a stopper  170  in a position where the movable roller  120  is adjacent to the rotary disc  110 , and held in a standby position. 
         [0069]    The distance between the stationary roller  118  and the movable roller  12 , when the stationary roller  118  and the movable roller  120  are in standby position, is set to be smaller than the diameter of the coin  102 . Therefore, the coin  102  pushed by the pusher  154  is guided at its one side by the stationary roller  118 , so that the movable roller  120  is caused to move in the clockwise direction in  FIG. 2 . Then immediately after the diametrical extent of the coin  102  has passed between the stationary roller  118  and the movable roller  120 , the lever  166  is rapidly rotated in the counterclockwise direction by the spring  168 , so that the coin  102  is flipped. In other word, the coin  102  is flipped along the base  112 , and hence it is flipped out diagonally upward. 
         [0070]    The pins  158 ,  160  are biased by a spring such that they protrude to the top face  156  from below the base  112 , and slopes  171 ,  172  are formed in an upper end on the opposite side corresponding to the forward rotation of the rotary disc  110 . As a result, when the rotary disc  110  reversely rotates, the slopes  170 ,  172  are pushed by the coin  102 , so that the pins  158 ,  160  are pressed down against the spring force. 
         [0071]    Therefore, the coin  102  overcomes the pins  158 ,  160 , moves in the clockwise direction together with the rotary disc  110 , so that it will not be dispensed through the dispensing opening  162 . 
         [0072]    In the circular hole  144  on the bottom of the storing bowl  108 , a coin dropper  176  is provided. The coin dropper  176  has an outer face that is in close contact with the peripheral surface of the circular hole  144  and a circumferential edge opposing to the top face of the edge part of the rotary disc  110 . As a result, the coin dropper  176  functions to drop the coin  102  rotating integrally with the rotary disc  110  into the through-hole  148 . The coin dropper  176  is formed into a circular arc from a resin plate or metal plate, and fixed at its both ends to the storing bowl  108  with a screw  180  that penetrates through a slot  178  formed in a lateral wall of the storing bowl  108 . 
         [0073]    The slot  178  extends in a direction orthogonal to the top face of the rotary disc  110 . Therefore, the coin dropper  176  is position-adjustably attached to the lateral wall of the storing bowl  108  along the axial line of the circular hole  144  such that the distance from the top face of the rotary disc  110 , namely the distance from the base  112  falls within the extent of the slot  178 . As a result, a lower end of the coin dropper  176  is situated right above the edge of the rotary disc  110  in the circular hole  144 . 
         [0074]    To be more specific, the distance between the inner face of the coin dropper  176  and an outer lateral edge of the through-hole  148  of the rotary disc  110  is set to be less than half of the thickness of the coin to be retained. 
         [0075]    It is preferred that the inner surface of the coin dropper  176  overlaps with the peripheral edge of the through-hole  148  when the rotary disc  110  is viewed two-dimensionally. As a result, when the coin  102  is about to rotate integrally with the rotary disc  110  while riding on the edge of the rotary disc  110 , the coin  102  is forced to move toward the through-hole  148  by the coin dropper  176 , and the edge of the rotary disc  110  is substantially absent. Consequently, the coin  102  drops in the through-hole  148 , making it possible to dispense every last coin  102 . 
         [0076]    The rotary disc  110  is mounted to an upper end of a rotary shaft  182  rotatably attached to the base  112 , so as to be slidable in its axial direction and prevented from rotating with respect to the rotary shaft  182 . In other words, by interposing a shim having a low coefficient of friction between the rotary disc  110  and the top face  156  of the base  112 , it is possible to adjust the distance there between and to make the position of the rotary disc  110  suited for the thickness of a particular coin  102 . 
         [0077]    In this case, by adjusting the distance between the upper face of the rotary disc  110  and the lower end edge of the coin dropper within the extent of the slot  178 , a suitable positional relation is achieved that will not cause nipping of the coin  102  there between and allows quick dropping of the coin  102  into through-hole  148 . However, the coin dropper  176  may be integrally molded with the storing bowl  108 . 
         [0078]    The positioning device of the rotary disc  110  for thickness of coin may be implemented by other devices having the same function as the aforementioned shim. Also the positioning mechanism of the coin dropper  176  may be implemented by other devices having the same function. 
         [0079]    The money dispense detector  122  is a detector for detecting a coin  102  dispensed by the dispenser  116 , and may be implemented by a proximity sensor, an optical detector or the like. However, a proximity sensor that is less susceptible to dusts and requires no maintenance is preferably used. 
         [0080]    Next, explanation on a money dispensing process will be given. 
         [0081]    The motor  114  rotates, and the rotary disc  110  rotates in the counterclockwise direction in  FIG. 2  via the reducer  142 . This rotation causes the coin  102  dropping into the through-hole  148  to be guided circumferentially of the rotary disc  110  by the pins  158  and  160  and to be flipped by the dispenser  116 . At this time, since the coin  102  is guided by the base  112 , it is flipped diagonally upward according to the inclination of the base  112 . Therefore, the coin  102  is flipped diagonally upward against the gravity, so that the momentum of flipping will be attenuated. 
         [0082]    The coin  102  thus flipped is then detected by the money dispense detector  122 , and when the detection signal CU reaches a instructed dispense number, an end signal is outputted from the control unit  126  to the forward rotation unit  128  while a stop signal is outputted to the stop unit  130 . Thus an electric brake is applied for a certain period of time to the motor  114 , and the motor  114  is quickly stopped. In other words, the motor  114  is stopped by a rotary magnetic field in a direction opposite to that of the forward rotation, and following a certain amount of reverse rotation immediately after stopping, power supply is stopped. 
         [0083]    Next, an operation of the first embodiment will be explained with reference to a flowchart of  FIG. 3 . 
         [0084]    First, at step S 11 , whether there is a dispense instruction signal DS is determined, and if there is no dispense instruction signal DS, the flow loops step S 11 . If there is a dispense instruction signal DS, the flow proceeds to step S 12  where a forward rotation signal NS is outputted to the forward rotation unit  128 . This causes generation of a rotary magnetic field in the forward rotation direction of the motor  114  and thus the rotary disc  110  is rotated in the forward direction. 
         [0085]    The coin  102  that has dropped into the through-hole  148 , and is pushed by the pusher  154  and sliding on the top face  156  of the base  112  is guided in the circumferential direction by the pins  158 ,  160  by the forward rotation of the rotary disc  110 . As a result, the coin  102  is sandwiched between the stationary roller  118  and the movable roller  120 , and flipped by spring force of the spring  168  immediately after the diametrical extent has passed there between. 
         [0086]    The money dispense detector  122  detects the flipped coin  102  and outputs a detection signal CS. The detection signal CS from the money dispense detector  120  is counted and compared with an instructed dispense number at step S 13 . When the count is less than the instructed dispense number, the flow loops step S 13 , whereas when the count reaches the instructed dispense number, the flow proceeds to step S 14 . 
         [0087]    At step S 14 , a reverse rotation signal CS is outputted to the reverse rotation unit  132 . The reverse rotation unit  132  causes the motor  114  to generate a rotary magnetic field that rotates in a direction opposite to the forward rotation direction. As a result, the motor  114  suddenly stops under application of braking force, and immediately rotates in the reverse direction. 
         [0088]    Therefore, reverse rotation is immediately started after the coins  102  are prevented from being excessively dispensed by the sudden stop of the rotary disc  110 . This reverse rotation continues until a predetermined time has elapsed at step S 115 , and then at step S 116 , a stop signal SS is outputted to the stop unit  130 . 
         [0089]    Since the stop unit  130  stops supplying power to the motor  114 , the rotary disc  110  naturally stops after reversely rotating for a predetermined time. Due to the reverse rotation of the rotary disc  110 , the coins  102  in the storing bowl  108  will be stirred by the through-hole  148 , the stirrer  150  and the stirring projection  152  rather than dispensed through the dispensing opening  62  as described above. Therefore, when the coin  102  drops from a predetermined path  183  and angularly stacks, the angular stack will be leveled and flattened. Also, the position of the coin  102  is forcibly changed according to the reverse rotation of the rotary disc  110  so that it becomes easy to drop in the through-hole  148 . 
         [0090]    The rotary disc  110  will stop after rotating a predetermined angle by inertial force because in the present embodiment, the power supply of the motor  114  to the rotary disc  110  is stopped after a predetermined time of reverse rotation following the stop of the rotary disc  110 . Since the rotational resistance of the rotary disc  110  changes with the retained amount of coins  102 , the rotational amount of predetermine angle of the rotary disc  110  is variable. 
         [0091]    Accordingly, the rotation of predetermined amount (angle) after stopping of the rotary disc  110  is preferably set to be more than or equal to a certain amount, for example, set so that the rotary disc  110  rotates by at least one rotation, preferably within a range of two rotations to ten rotations. That is, when a small amount of coins  102  are retained in the storing bowl  108 , stirring effect due to rotation of the rotary disc extends over the whole retained coins even if the rotation amount is small. 
         [0092]    However, when a large amount of coins  102  are retained in the storing bowl  108 , the stirring effect does not extend over coins  102  in an upper portion within the storing bowl  108  when the rotation amount of the rotary disc  110  is small, so that a more rotation amount is required. When a more reverse rotation amount at the stop time is set and the next dispense instruction signal DS is immediately outputted, dispense of the next coin  102  is delayed, so that the reverse rotation amount is limited to at most ten rotations. 
         [0093]    Therefore, when the retaining amount in the storing bowl  108  is small, for example when about 50 one-euro coins are retained, one rotation to five rotations are preferable, and when about 100 one-euro coins are retained, a range of two rotations to ten rotations is preferable. 
         [0094]    Further, when all coins from one-cent coin to two-euro coin are applied with the same setting, setting to a range of two rotations to five rotations is preferable. 
         [0095]    Next, the second embodiment will be explained with reference to  FIGS. 4 and 5 . 
         [0096]    The second embodiment is an example in which a money acceptance detector  200  is added to the first embodiment. That is, by counting the money acceptance signal ES from the money acceptance detector  200 , when the coins  102  reach a specified number, or in other words, a specified number of coins  102  are newly put into the storing bowl  108 , the rotary disc  110  is rotated reversely to level and flatten the angularly stacked coins  102 . The coins  102  are input to the storing bowl  108  one by one through the upper opening  146  from a predetermined position at a certain interval. 
         [0097]    In order to detect these input coins, an optical transmissive money acceptance detector  200  having a projector  204  disposed on one side of a coin dropping path  202  and a light receiver  206  disposed on the other side is provided. The money acceptance detector  200  may be a reflection optical detector, metal detector or the like. 
         [0098]    The control unit  124  is equipped with accepted money counting means  208  and accepted money reversing means  210 . The accepted money counting means  208  counts up a counting value whenever it receives a money acceptance signal ESS from the money acceptance detector  200 , and resets the counting value to zero upon reception of a reset signal RS issued under a predetermined condition. 
         [0099]    The accepted money reversing means  210  outputs a reverse rotation signal CS to the reverse rotation unit  132  when the counting value of the accepted money counting unit  208  reaches a specified number, for example, 10. It is also preferred to provide accepted money number setting means  212  for setting a counting value for comparison (comparative value in step S 227  described below) in the accepted money counting means  208 . 
         [0100]    In other words, since the stacking amount of coins in the storing bowl  108  differs according to the size of coin even for the same number of coins, it is necessary to optimally set a reference value for conducting a flattening suited for a particular coin denomination. 
         [0101]    Next, an operation of the second embodiment will be explained with reference to a flowchart of  FIG. 5 . 
         [0102]    First, referring to  FIG. 5(A) , a money acceptance processing program of money acceptance signal ES from the money acceptance detector  200  will be explained. In the second embodiment, settings are made so that when the counting value of the accepted money counting means  208  reaches 10, a reverse rotation signal CS is outputted to the reverse rotation unit  132 . 
         [0103]    Incidentally, in case of large diameter coins, for example, two-euro coins, one-euro coins, and 50-cent euro coins, since it is difficult to stir these coins by rotation of the rotary disc  110 , it is preferable that the rotary disc  110  is rotated by a predetermined angle in a state where accepted money is small, for example, when the counting value reaches 5. 
         [0104]    At step S 21 , the counting value from the money acceptance detector  200  is reset to zero. Next, at step S 22 , whether a detection signal ES from the money acceptance detector  200  is present is determined. If there is no money acceptance signal ES, the flow loops step S 22 , whereas if there is a money acceptance signal ES, the flow proceeds to step S 23 . After counting the money acceptance signal ES at step S 23 , the flow proceeds to step S 24 . 
         [0105]    At step S 24 , whether the counting value is 10 or not is determined, and when it is less than 10, the flow returns to step S 22 , whereas when it is 10, the flow proceeds to step S 25 . In other words, when the counting value is 10, it means the state that new coins drop from one position into the storing bowl  108  and angularly stack therein. 
         [0106]    After outputting a reverse rotation signal CS to a control program of the rotary disc  110  as will be later at step S 25 , the flow proceeds to step S 21 . Incidentally, the zero reset at the step S 21  can be performed between step S 24  and step S 25 . 
         [0107]    In this case, since the rotary disc  110  is reversely rotated only when the number of coins newly accepted reaches a set value, there is such a merit that the number of reverse processings is reduced. 
         [0108]    Next, explanation will be given for a money dispense processing program shown in  FIG. 5(B) . 
         [0109]    First, at step S 221 , whether there is a reverse rotation signal RS of a money acceptance processing program is determined. When there is a reverse rotation signal RS, the flow proceeds to step S 222  where a reverse rotation signal CS is outputted to the reverse rotation unit  132 . As a result, the motor  114  reversely rotates as described above, so that the rotary disc  110  also rotates reversely. Then after timing for a predetermined time period at step S 223 , the flow proceeds to step S 224  where a stop signal SS is outputted to the stop unit  130 . 
         [0110]    As a result, the stop unit  130  stops supplying power to the motor  114 , so that the motor  114  or the rotary disc  110  will stop after rotating a predetermined angle by inertial force. Thus the rotary disc  110  is rotated for a predetermined time (predetermined angle), and the coins  102  stacking as described above are stirred and flattened. This makes it possible to retain the coins  102  while sufficiently utilizing the coin retaining capacity of the coins  102 . 
         [0111]    Then the flow proceeds to step S 225  where whether there is a dispense instruction signal DS is determined. When there is no dispense instruction signal DS, the flow returns to step S 221 , and loops step S 221  and S 225 . When there is a dispense instruction signal DS, the flow proceeds to step S 226  where a forward rotation signal NS is outputted to the forward rotation unit  128 . 
         [0112]    In response to this, the forward rotation unit  128  causes the motor  114  to generate a rotational magnetic field of the forward rotation as is the case with the first embodiment, so that the output axis  134  of the motor  114  forwardly rotates and hence the rotary disc  110  rotates forwardly. Immediately after having guided circumferentially by the pins  158 ,  160  by the forward rotation of the rotary disc  110 , the coin  102  is flipped by the movable roller  120 . 
         [0113]    The flipped coin  102  is detected by the money dispense detector  122 , and the detection signal CU is counted and compared with an instructed dispense number at step S 227 . When the counted number is less than the instructed dispense number, the flow loops step S 227 , and when the counted number reaches the instructed dispense number, the flow proceeds to step S 228 . At step S 228 , a reverse rotation signal CS is outputted to the reverse rotation unit  132 . 
         [0114]    As a result, a braking force is exerted on the motor  114  as is the same with the first embodiment, and the motor reversely rotates following the sudden stop. In other words, the rotary disc  110  reversely rotates immediately after the sudden stop. This reverse rotation is continued until a predetermined time has elapsed at step S 229 , and then a stop signal SS is outputted to the stop unit  130  at step S 230 . 
         [0115]    Since the stop unit  130  stops supplying power to the motor  114 , the rotary disc  110  rotates by at least one rotation by inertia force as is described above, and the naturally stops. 
         [0116]    Since the coins  102  in the storing bowl  108  are stirred by the through-hole  148 , the stirrer  150  and the stirring projection  152  due to this reverse rotation, the angularly stacking coins, if any, will be leveled and flattened. 
         [0117]    In the second embodiment, when the number of coins  102  that are newly input reaches a specified number, the rotary disc  110  reversely rotates by a predetermined angle, and hence angularly stacking coins can be leveled and flattened by the reverse rotation without dispensing any coins  102 . This provides an advantage that retention utilizing the retaining capacity of the storing bowl  108  can be achieved. Therefore, steps S 22  and S 23  of the program correspond to the accepted money counting means  208 , and steps S 24  and S 25  correspond to the accepted money reversing means  210 . 
         [0118]    Although the accepted money counting means  208  and the accepted money reversing means  210  are configured by software in the present embodiment, they may be configured by hardware such as a block circuit. 
         [0119]    Next, the third embodiment will be explained with reference to  FIG. 6 . 
         [0120]    The third embodiment is different from the second embodiment in that the rotary disc  110  is reversely rotated when a difference between an accepted money count and a dispensed money count reaches a specified number, though the point that the rotary disc  110  is reversely rotated by a predetermined angle based on the accepted money count is taken over. 
         [0121]    As shown in  FIG. 6(C) , the control unit  124  includes accepted money counting means  208 , dispense counting means  300  and different calculating means  304  serving as stacking amount detecting means  302 . The accepted money counting means  208  has an identical function as the accepted money counting means  208  of the second embodiment. The dispense counting means  300  counts a detection signal CU from the money dispense detector  122 . 
         [0122]    The difference calculating means  304  calculates a difference between the counts of the accepted money counting means  208  and the dispense counting means  300 , and when the accepted money count is larger than a predetermined amount, it outputs a reverse rotation signal CS to the reverse rotation unit  132 . The stacking amount detecting means  302  is able to directly detect a stacking amount of the coins  102 . 
         [0123]    Next, an operation of the third embodiment will be explained. 
         [0124]    First, explanation will be given for a difference calculating program shown in  FIG. 6(A) . 
         [0125]    At step S 31 , after conducting initial setting by resetting the accepted money count and the dispense count stored in a storage to zero, the flow proceeds to step S 32 . At step S 32 , whether there is a money acceptance signal ES from the money acceptance detector  200  is determined. When there is no money acceptance signal ES, the flow proceeds to step S 33 , whereas when there is a money acceptance signal ES, the flow proceeds to step S 34  where the count is incremented by one before proceeding to step S 33 . 
         [0126]    At step S 33 , whether there is a dispense signal CU from the money dispense detector  122  is determined. When there is no dispense signal CU, the flow proceeds to step S 35 , whereas when there is a dispense signal CU, the flow proceeds to step S 36  where the count is incremented by one before proceeding to step S 35 . 
         [0127]    Next, at step S 35 , a count value of the dispense number counted at step S 36  is subtracted from the count value of accepted money number counted at step S 34  to calculate a difference between the accepted money and dispensed money, and then the flow proceeds to step S 37 . At step S 37 , when the difference reaches a specified number, for example, 10, the flow proceeds to step S 38 , whereas when the difference does not reach the above number, the flow returns to step S 32 . 
         [0128]    Incidentally, the zero reset at the step S 31  can be performed between step S 37  and step S 38 . 
         [0129]    At step S 38 , after outputting a reverse rotation signal CS to the reverse rotation unit  132 , the flow proceeds to step S 39 . After timing a predetermined time at step S 39 , the flow proceeds to step S 3 A where the reverse rotation signal CS is outputted to the reverse rotation unit  132 . Accordingly, the motor  114  reversely rotates for a predetermined time (at least one rotation) after preventing excess dispense by the sudden stop as described above, and then the coins  102  in the storing bowl  108  are stirred and flattened as described above. Therefore, steps S 35  and S 37  correspond to the difference calculating means  304 . 
         [0130]    A money dispense processing program shown in  FIG. 6(B)  conducts processings in a similar manner as the second embodiment. 
         [0131]    To be more specific, at the time of dispensing coins, the rotary disc  110  forwardly rotates, and then reversely rotates by a predetermined angle upon completion of the instructed coin dispense, and the coins  102  are flattened by stirring. Therefore, in the case of the third embodiment, the rotary disc  110  is reversely rotated and the coins  102  are stirred not only after end of dispense of coins but also when the accepted money number exceeds the dispensed money number by a specified number. In other words, when coins are almost continuously received and stacked, the rotary disc  110  is caused to reversely rotate to flatten the coins. 
         [0132]    In this way, since the third embodiment is able to flatten the coins  102  in the storing bowl  108  to comparable extent to the second embodiment despite less reverse rotation time of the motor  114 , the energy consumption is reduced, and durability or the like of the motor  114  can be improved. 
         [0133]    Next, the fourth embodiment of the present invention will be explained with reference to  FIGS. 7 and 8 . 
         [0134]    In the fourth embodiment, the second embodiment is applied to a coin recycling machine capable of automatically accepting and dispensing eight variations of euro coins. To be more specific, it is a coin recycling machine capable of retaining coins by denomination in the coin dispensing device after receiving 1-cent coin, 2-cent coin, 10-cent coin, five-cent coin, 20-cent coin, one-euro coin, 50-cent coin, and two-euro coin in bulk, and automatically dispensing a specified number of specified denomination based on an instruction for dispense. 
         [0135]    In  FIG. 7 , a coin recycling machine  400  includes a coin receiver  402 , a coin aligner  404 , a denomination discriminator  406 , an unacceptable coin rejecter  408 , a 1C-coin dispensing device  410 , a 2C-coin dispensing device  412 , a 10C-coin dispensing device  414 , a 5C-coin dispensing device  416 , a 20C-coin dispensing device  418 , a one-euro coin dispensing device  420 , a 50-cent coin dispensing device  422  and a two-euro coin dispensing device  424 , a coin conveyer  426 , an overflow cashbox  428 , a dispensing conveyer  430 , a separator  432  and a money dispensing slot  434 . 
         [0136]    The coin receiver  402  receives a plurality of coins in bulk, detects the acceptance by the money acceptance detector  436 , activates an acceptance motor  438  to feed the coins into the coin aligner  404 . The coins fed out of the coin receiver  402  are sequentially conveyed to the two-euro coin dispensing device  412  after passing a predetermined path from the coin aligner  404  by the coin converter  426 . The coin aligner  404  separates the plurality of coins received from the coin receiver  402  one by one, and aligns them in a line at predetermined intervals. The denomination discriminator  406  discriminates real/fake or denomination of the coins fed from the coin aligner  404 . 
         [0137]    The rejecter  408  returns the coins that are determined as fake or unacceptable in the denomination discriminator  406  to the dispensing slot  434  via the dispensing conveyer  430  and the separator  432 . As the coin dispensing devices  410 ,  412 ,  414 ,  416 ,  418 ,  420 ,  422  and  424 , the coin dispensing device  100  as shown in  FIG. 2  can be employed, for example. 
         [0138]    However, the size of the through-hole  148  of the rotary disc  110  is appropriately set to fit with the diameter of the retained coin, and the coin dropper  176  is adjusted within the range of the slot  178  in accordance with the position of the rotary disc  110  arranged to fit with the thickness of the coin  102 . The dispensing conveyer  430  is, for example, a flat belt circulated by the motor  440 , and arranged to connect the array of the respective coin dispensing devices. The dispensing conveyer  430  conveys coins  102  dispensed from each device toward the dispensing slot  434 . 
         [0139]    The separator  432  separates coins received from the dispensing conveyer  430  selectively into the dispensing slot  434  and the overflow cashbox  428 . The dispensing slot  434  is a bowl container for allowing a customer or a casher to receive the dispensed plurality of coins. 
         [0140]    In inlets in the storing bowl  108  of the coin dispensing devices, a money acceptance detectors  200 - 1 C,  200 - 2 C,  200 - 10 C,  200 - 5 C,  200 - 20 C,  200 - 1 E,  200 - 50 C and  200 - 1 E are respectively provided. 
         [0141]    Each coin dispensing devices is provided with money dispense detectors  122 - 1 C,  122 - 2 C,  122 - 10 C,  122 - 5 C,  122 - 20 C,  122 - 1 E,  122 - 50 C and  122 - 2 E, respectively. These detectors and the like are connected to the main control unit  442  of the coin recycling machine  400  and each motor is controlled by the main control unit  442 . The coin dispensing devices  410  to  424  of the fourth embodiment are operated according to the flow chart of the second embodiment. 
         [0142]    The coin recycling machine  400  for dispensing charge placed adjacent to a POS register in a supermarket or the like is requested to be miniaturized, so that the retaining capacity of the storing bowl  108  of the coin dispensing device  100  is limited. Therefore, the disadvantage that the newly accepted coins angularly stack and prevent the retaining capacity of the storing bowl  108  from being effectively used for retention of the coins  102  can be eliminated by stirring and flattening the coins by reverse rotation of the rotary disc, and an advantage that the coins may be retained with effective use of the retaining capacity is achieved. 
         [0143]    Particularly, in the present invention, since the rotary disc  110  is reversely rotated, an additional device is not necessary, the size will not increase and production with low cost is possible. 
         [0144]    Those skilled in the art will appreciate that various adaptations and modifications of the just-described preferred embodiment can be configured without departing from the scope and spirit of the invention. Therefore, it is to be understood that, within the scope of the amended claims, the invention may be practiced other than as specifically described herein.
A coin dispensing device and method is capable of insuring the dispensing of coins from a coin hopper even if a limited number of coins are stored. The coins in the hopper can be monitored and a control unit can direct the rotation of a rotary disc. Monitors can determine the dispensing and reception of coins including the amount of coins in the coin hopper. The control unit can cause the rotary disc to operate in a first direction for dispensing coins and in a second direction for agitating the coins and insuring receipt of coins by the rotary disc.