Patent Publication Number: US-11380155-B2

Title: Multi-unit coin ejection apparatus

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a multi-unit coin ejection apparatus having a plurality of coin ejection units and more particularly, to a multi-unit coin ejection apparatus capable of selectively activating or driving a plurality of coin ejection units using a single motor in response to instructions. 
     In this specification, the term “coin” has a wide meaning that includes not only coins as currency but also coin equivalents such as tokens and medals other than coins as currency, in which the shape of a “coin” is not limited to a circular one and may be a polygonal or any other one. 
     2. Description of the Related Art 
     Conventionally, multi-unit coin ejection apparatuses having a plurality of coin ejection units have been known. For example, Japanese Examined Patent Publication No. 6182787 issued on Aug. 4, 2017 discloses a multi-unit coin ejection apparatus, which comprises a plurality of coin ejection units and a plurality of coin storing containers respectively placed on the coin ejection units. Each of the coin ejection units are configured in such a way that coins stored in a corresponding one of the coin storing containers are ejected by a rotating disk placed just below the said container through a corresponding coin outlet. The coin ejection units, which are assigned to the respective denominations of coins, are driven in synchronization with each other by a single motor. When a dispensing instruction is received, coins of one or more necessary denominations for the instruction are ejected from one or more of the coin ejection units. In each of the coin ejection units, the control for selectively ejecting one or more coins of the assigned denomination in response to a dispensing instruction is realized by a shutter provided near the coin outlet. The shutter is formed by a passage preventing member provided movably in a through hole of the disk. The passage preventing member is configured in such a way as to protrude from the surface of the disk and sink below the same. When preventing the coin ejection, the passage preventing member is moved to protrude from the surface of the disk. When permitting the coin ejection, the passage preventing member is moved to sink below the surface of the disk. In this way, the control for selectively ejecting one or more coins of the assigned denomination in each of the coin ejection units in response to a dispensing instruction is realized using the shutter. 
     As the control method for electively ejecting one or more coins of the assigned denomination in each of the coin ejection units of a multi-unit coin ejection apparatus, another control method which is different from the aforementioned method of Publication No. 6182787 using the shutter is disclosed in Japanese Examined Patent Publication No. 2514825 issued on Apr. 30, 1996. With the control method of Publication No. 2514825, a desired dispensing operation is selectively carried out in one of two coin ejection units by controlling the rotation direction of a rotation shaft, in other words, by switching the rotation direction of a rotation shaft between the forward direction and the reverse direction. 
     With the aforementioned multi-unit coin ejection apparatus disclosed in Publication No. 6182787, since the coin ejection units, which are assigned to the respective denominations of coins, are driven by a single motor in synchronization with each other, there is an advantage that the cost for the motor can be reduced compared with the case where each of the coin ejection units is driven by its own motor. However, to realize the control for selectively ejecting one or more coins of the assigned denomination in each of the coin ejection units of a multi-unit coin ejection apparatus in response to a dispensing instruction, it is required to provide the shutter near the coin outlet of each of the coin ejection units and to control the open/close operation of the shutter in response to a dispensing instruction. However, the structure of the shutter is considerably complicated and at the same time, the control of the shutter needs to be precisely and thus, there are the disadvantages that the shutter is likely to malfunction and is likely to have insufficient durability. Accordingly, it is necessary to find or create a measure for solving or avoiding these disadvantages. 
     With the control method disclosed by the aforementioned Publication No. 2514825, since a desired dispensing operation is selectively carried out in one of the two coin ejection units by switching the rotation direction of a rotation shaft between the forward direction and the reverse direction, the aforementioned shutter is unnecessary. Thus, the structure of each of the coin ejection units is highly simplified and is unlikely to malfunction. Moreover, the aforementioned disadvantage about the durability also can be solved easily. 
     However, there arises another problem that the number of usable coin ejection units is limited to two. To control three or more coin ejection units using the aforementioned control method of Publication No. 2514825, it is necessary to provide two or more of the control mechanisms for switching the rotation direction of the respective rotation shafts between the forward and backward directions. This means that the overall structure of the plurality of control mechanisms is so complicated that the aforementioned advantages of this method, i.e., structural simplification, unlikely malfunction, and sufficient durability are lost. 
     SUMMARY OF THE INVENTION 
     The present invention was created while taking the aforementioned circumstances into consideration. 
     Accordingly, an object of the present invention is to provide a multi-unit coin ejection apparatus that makes it possible to selectively eject one or more coins of one or more necessary denominations from coin ejection units in response to a dispensing instruction without using a mechanism for selectively ejecting one or more coins of a predetermined denomination which is provided in each of coin ejection units, such as the aforementioned shutter of Publication No. 6182787, in the case where a structure that drives or activates coin ejection units with a single motor is employed. 
     Another object of the present invention is to provide a multi-unit coin ejection apparatus that makes it possible to simplify the structure of each of the coin ejection units, to produce the coin ejection units at low cost, to be unlikely to malfunction, and to be able to have desired durability easily. 
     The above objects together with others not specifically mentioned here will become clear to those skilled in the art from the following description. 
     A multi-unit coin ejection apparatus according to the present invention comprises: 
     a base having a mounting surface; 
     coin ejection units mounted on the mounting surface; 
     a first motor commonly used for the coin ejection units; 
     a driving mechanism, provided below the mounting surface, that is configured to drive the coin ejection units by transmitting a driving force of the first motor using gears; and 
     a switching unit, provided below the mounting surface, that is configured to switch a destination of the driving force of the first motor, thereby selectively driving one of the driving the coin ejection units; 
     wherein the switching unit comprises (i) first coupling gears which are respectively provided for the coin ejection units, (ii) second coupling gears which are engageable with the corresponding first coupling gears and which are provided for the driving mechanism, and (iii) a coupling gear displacement mechanism that is configured to displace the second coupling gears between a predetermined connection position and a predetermined non-connection position; 
     the coupling gear displacement mechanism is operated in response to an instruction in such a way that a designated one of the second coupling gears is disposed at the connection position and that a remainder of the second coupling gears is/are disposed at the non-connection position in accordance with the instruction; and 
     when a designated one of the second coupling gears is disposed at the connection position by the coupling gear displacement mechanism in response to an instruction, the driving force of the first motor is selectively transmitted to a corresponding one of the coin ejection units to the designated one of the second coupling gears. 
     With the multi-unit coin ejection apparatus according to the present invention, as explained above, the coin ejection units, which are mounted on the mounting surface of the base, are structured in such a way that one of the coin ejection units is selectively driven by switching the transmission destination of the driving force of the first motor using the switching unit. The switching unit comprises (i) the first coupling gears respectively provided for the coin ejection units, (ii) the second coupling gears provided for the driving mechanism to be engageable with the corresponding first coupling gears, and (iii) the coupling gear displacement mechanism that displaces the second coupling gears between the predetermined connection position and the predetermined non-connection position. Moreover, the coupling gear displacement mechanism is operated in response to an instruction in such a way that a designated one of the second coupling gears is disposed at the connection position and that a remainder of the second coupling gears is/are disposed at the non-connection position in accordance with the instruction. 
     Accordingly, when a designated one of the second coupling gears is disposed at the connection position by the coupling gear displacement mechanism in response to an instruction, since the remainder of the second coupling gears is/are disposed at the non-connection position, the driving force of the first motor is selectively transmitted to one of the coin ejection units corresponding to the designated one of the second coupling gears. This means that only the coin ejection unit to which the driving force of the first motor is transmitted can be driven to eject one or more coins of a predetermined denomination in accordance with the instruction, Therefore, it is unnecessary to control the permission and prevention of coin ejection in each of the coin ejection units individually in the case where the coin ejection units are configured to be driven by the first motor alone. 
     As a result, with the multi-unit coin ejection apparatus according to the present invention, it is unnecessary to provide a mechanism for selectively ejecting one or more coins of a predetermined denomination which is provided in each of coin ejection units, such as the aforementioned shutter of Publication No. 6182787, in the case where a structure that drives or activates coin ejection units with a single motor is employed. 
     Moreover, the switching unit can be formed by (i) the first coupling gears which are respectively provided for the coin ejection units, (ii) the second coupling gears which are engageable with the corresponding first coupling gears and which are provided for the driving mechanism, and (iii) the coupling gear displacement mechanism that is configured to displace the second coupling gears between the predetermined connection position and the predetermined non-connection position, and the engagement and disengagement between the first coupling gears and the corresponding second coupling gears can be carried out by simply operating or manipulating the coupling gear displacement mechanism. Accordingly, a simple structure which can be produced at low cost, such as a rotationally driven camshaft with cams, can be used for the coupling gear displacement mechanism. Furthermore, as described above, it is unnecessary to provide a mechanism that controls the permission and prevention of coin ejection in each of the coin ejection units individually. 
     Accordingly, the structure of each of the coin ejection units is simplified and the coin ejection units can be produced at low cost. In addition, the coin ejection units are unlikely to malfunction and are able to have desired durability easily. 
     In a preferred embodiment of the multi-unit coin ejection apparatus according to the present invention, each of the first coupling gears is formed by a gear which is fixed to a rotation shaft of a corresponding one of the coin ejection units and which has teeth and grooves formed on one side face thereof; and 
     each of the second coupling gears is formed by a gear which is fixed to a corresponding linking gear (e.g., a driven gear) of the driving mechanism and which has teeth and grooves formed on one side face thereof to be engageable respectively with the grooves and the teeth of a corresponding one of the first coupling gears. 
     In another preferred embodiment of the multi-unit coin ejection apparatus according to the present invention, the coupling gear displacement mechanism comprises: 
     a camshaft rotationally driven by a second motor, wherein the camshaft has cams which are assigned to the respective coin ejection units; and 
     cam followers which are respectively engaged with the second coupling gears and which are displaceable by the corresponding cams; 
     wherein the second coupling gears are displaced between the connection position and the non-connection position according to displacements of the cam followers due to rotations of the corresponding cams. 
     In still another preferred embodiment of the multi-unit coin ejection apparatus according to the present invention, there are provided with sensors that detect a rotational position of the camshaft; and 
     the coupling gear displacement mechanism judges which one of the second coupling gears is disposed at the connection position based on the detected rotational position of the camshaft by the sensors. 
     In a further preferred embodiment of the multi-unit coin ejection apparatus according to the present invention, detection members are fixed to the camshaft in a one-by-one correspondence to the cams; 
     sensors that detect respectively rotational positions of the detection members are provided at corresponding positions to the detection members; and 
     the coupling gear displacement mechanism judges which one of the second coupling gears is disposed at the connection position based on the detected rotational positions of the detection member by the sensors. 
     In a further preferred embodiment of the multi-unit coin ejection apparatus according to the present invention, a non-operable mode where the driving force of the first motor is not transmitted to all of the coin ejection units is provided in addition to an operable mode where the driving force of the first motor is transmitted to any one of the coin ejection units; and 
     the non-operable mode and the operable mode are configured to be switchable according to the necessity. 
     In a further preferred embodiment of the multi-unit coin ejection apparatus according to the present invention, the coupling gear displacement mechanism is configured to be rockable around a shaft which is supported by the base; 
     an operable mode where the driving force of the first motor is transmitted to any one of the coin ejection units and a non-operable mode where a driving force of the first motor is not transmitted to all of the coin ejection units are provided; and 
     the operable mode and the non-operable mode are configured to be switchable by a rocking motion of the coupling gear displacement mechanism around the shaft. 
     In a further preferred embodiment of the multi-unit coin ejection apparatus according to the present invention, a non-operable mode where the driving force of the first motor is not transmitted to all of the coin ejection units is provided in addition to an operable mode where the driving force of the first motor is transmitted to any one of the coin ejection units; 
     all of the coin ejection units are configured to be detachable from the base by a motion along the mounting surface; and 
     the coin ejection units can be selectively detached from the base by sliding a desired one or ones of the coin ejection units along the mounting surface in the non-operable mode. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order that the present invention may be readily carried into effect, it will now be described in detail with reference to the accompanying drawings, 
         FIG. 1  is a perspective view showing the overall structure of a multi-unit coin ejection apparatus according to an embodiment of the present invention, in which the state where lids of coin storing containers are removed is shown. 
         FIG. 2  is a perspective view showing the state where four coin storing containers are detached from the multi-unit coin ejection apparatus of  FIG. 1 . 
         FIG. 3  is a bottom view showing the structure of a driving mechanism and a switching unit, both of which are provided in a chassis or base of the multi-unit coin ejection apparatus of  FIG. 1 . 
         FIG. 4  is a bottom view showing the structure of the four coin ejection units of the multi-unit coin ejection apparatus of  FIG. 1 . 
         FIG. 5  is a perspective view showing the state where the four coin storing containers and the chassis or base are detached from the multi-unit coin ejection apparatus of  FIG. 1 . 
         FIG. 6  is a perspective view showing the structure of the driving mechanism and the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which is seen obliquely downward from the upper right front. 
         FIG. 7  is a perspective view showing the structure of the driving mechanism and the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which is seen obliquely upward from the lower left front, 
         FIG. 8  is a perspective view showing the structure of the driving mechanism and the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which is seen obliquely upward from the lower left rear. 
         FIG. 9  is a perspective view showing the structure of the driving mechanism and the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which is seen obliquely downward from the upper right rear. 
         FIG. 10A  is a perspective view showing an example of the structure of a cam follower used for the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which is seen obliquely downward from the upper right front. 
         FIG. 10B  is a perspective view showing the example of the structure of the cam follower used for the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which is seen obliquely downward from the upper right rear. 
         FIG. 11A  is a front view showing an example of the structure of a coupling gear used for the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which shows the state where the coupling gear is fixed to an upper surface of a corresponding driven gear. 
         FIG. 11B  is a perspective view showing the example of the structure of the coupling gear used for the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which is seen obliquely downward from an upper position. 
         FIG. 11C  is a perspective view showing the example of the structure of the driven gear used for the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which is seen obliquely upward from a lower position. 
         FIG. 12A  is a front view showing an example of the engagement structure of the cam follower used for the switching unit of the multi-unit coin ejection apparatus of  FIG. 1  with the corresponding driven gear. 
         FIG. 12B  is a rear view showing the example of the engagement structure of the cam follower used for the switching unit of the multi-unit coin ejection apparatus of  FIG. 1  with the corresponding driven gear. 
         FIG. 13A  is a perspective view showing an example of the structure of the coupling gear used for the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 , which is seen obliquely downward from an upper position. 
         FIG. 13B  is a plan view showing the example of the structure of the coupling gear used for the switching unit of the multi-unit coin ejection apparatus of  FIG. 1 . 
         FIG. 14  is an explanatory view showing the switching operation of the multi-unit coin ejection apparatus of  FIG. 1  between an operation mode and a non-operation mode by a rocking motion of the switching unit around a support shaft, in which the upper part shows the state in the operation mode and the lower part shows the state in the non-operation mode. 
         FIG. 15A  is a cross-sectional view showing the switching operation of a fourth coin ejection unit of the multi-unit coin ejection apparatus of  FIG. 1  between a connection state and a non-connection state according to a rotation position (or a rotation angle) of cams included in the switching unit, in which the fourth coin ejection unit is in the non-connection state. 
         FIG. 15B  is a cross-sectional view showing the switching operation of the fourth coin ejection unit of the multi-unit coin ejection apparatus of  FIG. 1  between the connection state and the non-connection state, in which the fourth coin ejection unit is in the non-connection state. 
         FIG. 15C  is a cross-sectional view showing the switching operation of the fourth coin ejection unit of the multi-unit coin ejection apparatus of  FIG. 1  between the connection state and the non-connection state, in which the fourth coin ejection unit is in the non-connection state. 
         FIG. 15D  is a cross-sectional view showing the switching operation of the fourth coin ejection unit of the multi-unit coin ejection apparatus of  FIG. 1  between the connection state and the non-connection state, in which the fourth coin ejection unit is in the connection state. 
         FIG. 16  is an explanatory view showing the connection/non-connection state of the first to fourth coin ejection units of the multi-unit coin ejection apparatus of  FIG. 1 , in which only the fourth coin ejection unit is in the connection state and the first to third coin ejection units are in the non-connection state. 
         FIG. 17  is an explanatory view showing the connection/non-connection state of the first to fourth coin ejection units of the multi-unit coin ejection apparatus of  FIG. 1 , in which only the third coin ejection unit is in the connection state and the first, second, and fourth coin ejection units are in the non-connection state. 
         FIG. 18  is an explanatory view showing the connection/non-connection state of the first to fourth coin ejection units of the multi-unit coin ejection apparatus of  FIG. 1 , in which only the second coin ejection unit is in the connection state and the first, and third to fourth coin ejection units are in the non-connection state. 
         FIG. 19  is an explanatory view showing the connection/non-connection state of the first to fourth coin ejection units of the multi-unit coin ejection apparatus of  FIG. 1 , in which only the first coin ejection unit is in the connection state and the second to fourth coin ejection units are in the non-connection state. 
         FIG. 20A  is an explanatory view showing the relative positions of the coupling gear in the first coin ejection unit and the corresponding coupling gear on the driven gear, in which the relative positions in the connection state is shown. 
         FIG. 20B  is an explanatory view showing the relative positions of the coupling gear in the first coin ejection unit and the corresponding coupling gear on the driven gear, in which the relative positions in the non-connection state is shown. 
         FIG. 21  is an explanatory view showing the connection/non-connect on state of the first to fourth coin ejection units of the multi-unit coin ejection apparatus of  FIG. 1 , in which all of the first coin ejection units are in the non-connection state (i.e., the multi-unit coin ejection apparatus of  FIG. 1  is in the non-operation mode). 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Preferred embodiments of the present invention will be described in detail below while referring to the drawings attached. 
     Structure of Multi-Unit Coin Ejection Apparatus  1   
     The overall schematic structure of a multi-unit coin ejection apparatus  1  according to an embodiment of the present invention is shown in  FIG. 1 , Moreover, the state where four coin storing containers  120  are detached from the multi-unit coin ejection apparatus  1  is shown in  FIG. 2 , the schematic structures of a driving mechanism  20  and a switching unit  40  which are provided in a chassis  11  of the apparatus  1  are shown in  FIG. 3 , and the structure of first to fourth coin ejection units  110  is shown in  FIG. 4 . 
     As shown in  FIG. 1 , the multi-unit coin ejection apparatus  1  according to the embodiment of the present invention is mainly formed by a base section  10  and a coin ejection section  100 . 
     The base section  10  comprises the chassis  11  which has a shape like a rectangular parallelepiped, and the approximately rectangular upper surface of the chassis  11  is formed as a mounting surface  11   a . The multi-unit coin ejection apparatus  1  is placed in such a way that the mounting surface  11   a  is approximately parallel to the horizontal plane. 
     The coin ejection section  100  comprises the first to fourth coin ejection units  110 , each of which has a corresponding one of the four coin storing containers  120  and a lid (not shown) that covers the upper opening of the said container  120 . The first to fourth coin ejection units  110  are arranged on the mounting surface  11   a  to be adjacently to each other along a straight line parallel to the long sides of the mounting surface  11   a  and are disengageably engaged with the mounting surface  11   a , A first motor M 1  for conducting the coin ejection operation by driving the respective coin ejection units  110  is fixed to one end of the chassis  11 . The rotational shaft (not shown) of the first motor M 1  is disposed so as to be perpendicular to the mounting surface  11   a . The control of the first motor M 1 , i.e., the start and stop of rotation and the switching of the rotation direction between the normal and reverse directions, is performed by a control device (not shown). 
     As the first motor M 1 , any known motor can be used if it has a rotational driving force sufficient for driving (the rotating disk of) each of the first to fourth coin ejection units  110  to conduct the predetermined coin ejection operation. 
     In the following explanation, the unit  110  disposed at the nearest position to the first motor M 1  is termed the “first coin ejection unit”, and the remaining three units  110  arranged in this order in a direction away from the first coin ejection unit  110  along the long sides of the mounting surface  11   a  are respectively termed the “second coin ejection unit”, the “third coin ejection unit”, and the “fourth coin ejection unit”. 
     The first to fourth coin ejection units  110  are respectively assigned to predetermined four denominations (for example, in the case of Japanese Yen, four denominations of 500 Yen, 100 Yen, 50 Yen, and 10 Yen). Thus, these four coin ejection units  110  are configured in such a way that coins of a relevant denomination are stored in the coin storing container  120  of a corresponding one of the units  110 . Each of the coin ejection units  110  ejects the coins of the relevant denomination stored in the corresponding coin storing container  120  to the outside one by one in response to a dispensing instruction which is sent from an upper-level device (for example, a coin depositing/dispensing apparatus). 
     The first to fourth coin ejection units  110  have the same structure. As shown in  FIGS. 2 and 5 , each of the units  110  comprises a plate-shaped body  111 , and a disk  112  which has four through holes and which is mounted so as to be rotatable in the body  111 . Since the mounting surface  11   a  is approximately horizontal, the disk  112  is rotatable in an approximately horizontal plane. If a coin of a relevant denomination which has been dropped from the corresponding coin storing container  120  is fitted into one of the through holes of the disk  112  during rotation, the said coin is thrown out of the hole by an inertial force caused by the rotation of the disk  112  and as a result, the said coin is ejected to the outside through an ejection outlet  113  provided at the rear end of the body  111 . In addition, at the time of coin ejection, the said coin thus thrown out of the corresponding hole is controlled so as to abut on a coin guide  116  provided near the ejection outlet  113 : as a result, the ejection direction of said coin is always controlled in a predetermined direction. 
     Needless to say, the count of the through holes of the disk  112  is not limited to four and it may be set as any number other than four. Moreover, it is needless to say that the disks  112  provided for all the denominations to be ejected need not have the same structure (i.e. which have an equal count of the holes) and that the disks  112  may have different structures (i.e. which have different counts of the holes) according to the assigned denominations. 
     In each of the first to fourth coin ejection units  110 , a rotational shaft  115  that extends approximately vertically and that is rotatably supported is provided in the body  111 . The disk  112  is engaged with the top end of the shaft  115 . As shown in  FIG. 4 , a coupling gear  114  is fixed to the lower end of the shaft  115  and thus, the coupling gear  114  and the disk  112  are rotated integrally along with the rotation of the shaft  115 . This means that the coupling gear  114  also is rotated in the approximately horizontal plane similar to the disk  112 . 
     As shown in  FIG. 3 , in the chassis  11 , a driving mechanism  20  that selectively drives rotationally one of the disks  112  in the first to fourth coin ejection units  110  by transmitting the driving force of the first motor M 1 , and a switching unit  40  that switches the transmission destination of the rotational driving force of the first motor M 1  to selectively drive one of the first to fourth coin ejection units  110  are provided. 
     The structure of the driving mechanism  20  is shown in  FIG. 3  and  FIGS. 6 to 9 . Specifically, the driving mechanism  20  comprises a plurality of gears that are arranged approximately linearly along the long sides of the chassis  11 . More specifically, the driving mechanism  20  comprises (i) a driving gear  21  fixed to the rotational shaft of the first motor M 1 ; (ii) four driven gears  23 ,  25 ,  27 , and  29  that are respectively fixed to the lower ends of the rotational shafts  115  of the first to fourth coin ejection units  110 ; (iii) an intermediate gear  22  rotatably placed between the driving gear  21  and the driven gear  23  for the first coin ejection unit  110 ; (iv) an intermediate gear  24  rotatably placed between the driven gear  23  for the first coin ejection unit  110  and the driven gear  25  for the second coin ejection unit  110 ; (v) an intermediate gear  26  rotatably placed between the driven gear  25  for the second coin ejection unit  110  and the driven gear  27  for the third coin ejection unit  110 ; (vi) and an intermediate gear  28  rotatably placed between the driven gear  27  for the third coin ejection unit  110  and the driven gear  29  for the fourth coin ejection unit  110 . 
     All of the driven gears  23 ,  25 ,  27 , and  29  and the intermediate gears  22 ,  24 ,  26 , and  28  are located in a plane parallel to the mounting surface  11   a  (i.e., an approximately horizontal plane) and are arranged along the straight line parallel to the long sides of the mounting surface  11   a  (along which the first to fourth coin ejection units  110  are arranged). The driven gears  23 ,  25 ,  27 , and  29  and the intermediate gears  22 ,  24 ,  26 , and  28  are rotatable integrally along with the corresponding eight rotational shafts (not shown) which are rotatably supported in the chassis  11 , respectively. As easily understood from the structure of the driving mechanism  20 , all of the driven gears  23 ,  25 ,  27 , and  29  prepared respectively for the first, second, third, and fourth coin ejection units  110  are rotated in the same direction as the driving gear  21 . 
     As shown in  FIGS. 6 to 9 , coupling gears  30 ,  31 ,  32 , and  33  (which correspond to the second coupling gears) are respectively fixed onto the upper surfaces (upper side faces) of the driven gears  23 ,  25 ,  27 , and  29  of the first to fourth coin ejection units  110 . These coupling gears  30 ,  31 ,  32 , and  33  are rotated integrally along with the corresponding driven gears  23 ,  25 ,  27 , and  29 , respectively. Moreover, the coupling gears  30 ,  31 ,  32 , and  33  are disengageably engaged with corresponding four coupling gears  114  (see  FIG. 4 ) (which correspond to the first coupling gears) fixed to the corresponding rotational shafts  115  of the first, second, third, and fourth units  110 , respectively. These four coupling gears  30 ,  31 ,  32 , and  33  are selectively engaged with the corresponding four coupling gears  114  or disengaged from the same by the switching unit  40 . Due to this selective engagement and disengagement, the first to fourth coin ejection units  110  as the transmission destination of the driving force of the first motor M 1  is switched. 
     The switching unit  40  has the structure shown in  FIGS. 6 to 9 . Specifically, the switching unit  40  comprises an approximately bar-shaped frame  42  formed by combining a plurality of thin plates, a camshaft  43  rotatably supported by the frame  42 , and a second motor M 2  supported by the frame  42 . Four cams  44  and four detection members  45  are fixed to the camshaft  43 . The second motor M 2  is used for rotationally driving the camshaft  43 . The frame  42  and the camshaft  43  are parallel to each other and are extended along the aforementioned straight line (along which the first to fourth coin ejection units  110  are arranged), The total length of the frame  42  and that of the camshaft  43  are approximately the same as that of the space that encloses the driven gears  23 ,  25 ,  27 , and  29  and the intermediate gears  22 ,  24 ,  26   d , and  28 . The second motor M 2  has a driving gear  50  which is fixed to a rotational shaft (not shown) of the motor M 2  (see  FIG. 8 ). The driving gear  50  is rotatably engaged with the driven gear  51  which is fixed to the camshaft  43  at the position opposing to the driving gear  50 . The camshaft  43  is rotationally driven by the rotational driving force of the second motor M 2 . 
     The frame  42  comprises a belt-shaped frame body  42   a  and four supporting parts  42   b . The frame body  42   a  is extended over the whole length of the frame  42 . All of the four supporting parts  42   b  are formed to protrude perpendicularly from the frame body  42   a  in the same direction. Two of the supporting parts  42   b  are disposed at a predetermined distance near the middle position of the frame body  42   a . The remaining two supporting parts  42   b  are disposed at the two end positions of the frame body  42   a , respectively. Two supporting shafts  41  are fixed to the two supporting parts  42   b  disposed at the end positions in the outside of the frame  42 , respectively. These two supporting shafts  41  are protruded in opposite directions from the corresponding supporting parts  42   b  along the extending direction of the frame  42  and the camshaft  43 , and rotatably supported by two supporting members (not shown) fixed in the chassis  11 , respectively. For this reason, the entire frame  42  can be rocked around the two supporting shafts  41  disposed at the ends of the frame  42 . Due to this rocking motion of the frame  42 , the camshaft  43  also is rocked around the two supporting shafts  41  to be displaced. The second motor M 2 , which is disposed between the camshaft  43  and the frame body  42   a  at the position approximately opposite to the intermediate gear  24 , is fixed to the inner surface of the frame body  42   a.    
     In this embodiment, the camshaft  43  is formed by coupling two shaft members  43   a  with a joint or connector  43   b . One of the shaft members  43   a  is rotatably supported by the two supporting parts  42   b  disposed at the right side half of the frame body  42   a , and the other of the shaft members  43   a  is rotatably supported by the two supporting parts  42   b  disposed at the left side half of the frame body  42   a . However, this structure is used for facilitating the assembly. Thus, it is needless to say that the camshaft  43  may be formed by a single shaft member. 
     As the second motor M 2 , a known servo motor or stepping motor may be used. However, the present invention is not limited to these motors. It is needless to say that any motor may be used for the second motor M 2  if it can control precisely the rotational position or rotational angle of the camshaft  43 . 
     The start and stop of the rotation of the second motor M 2  and the switching of the rotation direction thereof between the forward and backward directions, which are performed by an unillustrated control device, can be appropriately adjusted according to the arrangement of the four cams  44  on the camshaft  43 . For example, the second motor M 2  is usually configured to be rotated in the forward and backward directions; however, the second motor M 2  may be configured to be rotated only in one direction (i.e., only the forward or backward direction). 
     The four cams  44  fixed to the camshaft  43  are respectively prepared for the first to fourth coin ejection units  110 . These cams  44  are the same in shape and size as each other, Each of the cams  4  is formed by a member with a predetermined thickness which has a shape like an isosceles triangle whose three corners are rounded. As seen from  FIG. 6 , these four cams  44  are fixed to the camshaft  43  in such a way as to shift sequentially at a phase difference of 90°. This is to make it possible to selectively switch the transmission destination of the driving force of the first motor M 1  among the first to fourth coin ejection units  110  by changing the rotational position or angle of the camshaft  43 . 
     The four cams  44  are configured to cooperate with the four cam followers  48  (see  FIGS. 7 and 8 ) which are respectively engaged with the corresponding driven gears  23 ,  25 ,  27 , and  29  provided respectively for the first to fourth coin ejection units  110 . 
     The four cam followers  48  have the function of displacing the corresponding driven gears  23 ,  25 ,  27 , and  29  in upper and lower directions. These four cam followers  48  are the same in shape and size, each of which has the structure shown in  FIGS. 10A and 10B . Specifically, each of the cam followers  48 , the entire shape of which is like a Y character, comprises a cam receiving part  48   a  and a branching part  48   b . The cam receiving part  48   a  is a part for receiving the corresponding cam  44 . The branching part  48   b  is a part that is engaged with an engagement member (e.g., an engagement member  23   a  shown in  FIGS. 12A and 12B ) mounted on a corresponding one of the driven gears  23 ,  25 ,  27 , and  29 . A shaft hole  48   c  is formed near the boundary between the cam receiving part  48   a  and the branching part  48   b . When the cam reeving part  48   a  is pressed downward by the protruding part of the corresponding cam  44 , the cam follower  48  is rocked around a support shaft  48   f  (see  FIG. 12A ) which is fit in the shaft hole  48   c  and as a result, the branching part  48   b  is pressed upward. When the downward pressing force to the cam reeving part  48   a  by the protruding part of the corresponding cam  44  is lost, the cam follower  48  is returned to its initial position by the elastic force of a corresponding spring  47  (see  FIGS. 7 and 8 ) disposed right below the cam reeving part  48   a . This means that the cam follower  48  is rocked around the support shaft  48   f  (or the shaft hole  48   c ) like a seesaw in response to the presence or absence of the downward pressing force applied to the cam reeving part  48   a.    
     Two pins  48   d  are respectively fixed inwardly to the ends of two arms that forms the branching part  48   b  of the cam follower  48 . Two rollers  48   e  are rotatably engaged with these two pins  48   d , respectively. The reason why the rollers  48   e  are provided is to realize the smooth engagement operation of the cam follower  48  with the engagement member (e.g., the engagement member  23   a ) mounted on the corresponding one of the driven gears  23 ,  25 ,  27 , and  29 . 
       FIGS. 11A, 11B, and 11C  show an example of the structure of the engagement member  23   a  mounted on the driven gear  23  for the first coin ejection unit  110 , in which the coupling gear  30  is fixed to the driven gear  23 . 
     As seen from  FIGS. 11A, 11B, and 110 , the coupling gear  30 , the diameter of which is slightly smaller than the driven gear  23 , is fixed to the upper side face (upper surface) of the driven gear  23  in such a way as to be coaxial with the same gear  23 . The engagement member  23   a  having an approximately cylindrical shape is fixed to the lower side face (lower surface) of the driven gear  23  in such a way as to protrude downward. The engagement member  23   a , which is fixed to be coaxial with the driven ear  23 , has a flange part  23   aa  that protrudes laterally at the lower end thereof. The flange part  23   aa  forms one of the engagement faces for the branching part  48   b . The lower side face of the driven gear  23  forms the other of the engagement faces for the branching part  48   b . The branching part  48   b  is inserted between the flange part  23   aa  and the lower surface of the driven gear  23  to be engaged with the same. The engagement member  23   a  has a shaft hole  23   b  which is coaxial with the corresponding driven gear  23  and the corresponding coupling gear  30 . The two rollers  48   e , which are attached to the two ends of the branching part  48   b  of the cam follower  48 , are engaged with the part which is sandwiched by the flange part  23   aa  and the lower surface of the driven gear  23 . While the branching part  48   b  of the cam follower  48  is rocked upward or downward around the support shaft  48   f , the rollers  48   e  are rolled, thereby realizing smooth movement of the driven gear  23  and the coupling gear  30  between the connection position and the non-connection position. 
     The aforementioned is applicable to the driven gears  25 ,  27 , and  29 . As shown in  FIG. 7 , engagement members  25   a ,  27   a , and  29   a  each having an approximately cylindrical shape are respectively mounted on the driven gears  25 ,  27 , and  29  for the second to fourth coin ejection units  110 . The engagement members  25   a ,  27   a , and  29   a  are respectively fixed to the lower side faces (lower surfaces) of the driven gears  25 ,  27 , and  29  in such a way as to protrude downward. 
     In this embodiment, as shown in  FIG. 11 , the coupling gear  30  fixed to the upper side face (upper surface) of the driven gear  23  has the structure that gear teeth  30   a  are formed in the upper side face thereof along its circular rim at equal intervals. A gear groove  30   b  is formed between each of the two adjoining gear teeth  30   a . This means that the gear teeth  30   a  of the coupling gear  30  are formed to protrude upward while the gear teeth of the driven gear  23  are formed to protrude laterally and radially, A shaft hole  30   c  is formed at the center of the coupling gear  30  to be coaxial with the shaft hole of the driven gear  23 . 
     The engagement state of the cam follower  48  and the corresponding engagement member  23   a  is shown in  FIGS. 12A and 12B , The cam follower  48  is rockable around the support shaft  48   f  which is fit in the shaft hole  48   c . Due to the rocking motion of the cam follower  48 , the coupling gear  30  (one of the second coupling gears) and the corresponding coupling gear  114  (one of the first coupling gears) can be switched between the connection state and the non-connection state. In  FIG. 12A , the protruding part of the cam  44  (i.e., the part of the cam  44  that protrudes most from the cam shaft  43 ) lowers slightly the cam receiving part  48   a  and at the same time, the branching part  48   b  is slightly raised due to the lowering of the cam receiving part  48   a , resulting in a slight rising operation of the driven gear  23  and the coupling gear  30 . In this state, the coupling gear  30  is engaged or meshed with the corresponding coupling gear  114 , which means that the coupling gear  30  is in the connection state. On the other hand, when the cam  44  is rocked and the protruding end thereof is disengaged from the cam receiving part  48   a , the cam receiving part  48   a  is slightly displaced upward (i.e., returned to the initial position) due to the elastic force of the spring  47  (see  FIG. 7 , for example) placed just below the cam receiving part  48   a , as shown in  FIG. 12B , resulting in a slight lowering operation of the driven gear  23  and the coupling gear  30  (i.e., returned to the initial position). In this state, the coupling gear  30  is not engaged or meshed with the corresponding coupling gear  114 , which means that the coupling gear  30  is in the non-connection state. 
     The end of the aforementioned spring  47  opposite to the cam receiving part  48   a  is supported by a supporting structure (not shown) provided just below the spring  47  in the chassis  11 . For this reason, the elastic force of the spring  47  is always applied to the cam receiving part  48   a  and as a result, the cam receiving part  48   a  is kept at a predetermined upper position and the branching part  48   b  is kept at a predetermined lower position. Accordingly, the coupling gear  30  is located at the aforementioned lower position, i.e., the “non-connection position”, except for the time when the branching part  48   b  is pressed downward by the protruding part of the cam  44 . When the branching part  48   b  is pressed downward by the protruding part of the cam  44 , the coupling gear  30  is moved to the aforementioned upper position, i.e., the “connection position”. When the downward pressing action by the protruding part of the cam  44  is lost, the coupling gear  30  is automatically returned to the “non-connection position”. In this way, the coupling gear  30  can be switched between the “connection position” and the “non-connection position” by way of the cam follower  48  due to a simple rocking operation of the cam  44 . 
     An example of the structure of the coupling gear  114  corresponding to the coupling gear  30  is shown in  FIGS. 13A and 13B . In this structure example, gear teeth  114   a  are formed in the lower side face thereof along its circular rim at equal intervals. A gear groove  114   b  is formed between each of the two adjoining gear teeth  114   a . This means that the gear teeth  114   a  of the coupling gear  114  are formed to protrude downward, A shaft hole  114   c  is formed at the center of the coupling gear  114  to be coaxial with the shaft hole of the corresponding coupling gear  30  at the time of connection. The gear teeth  114   a  and the gear grooves  114   b  of the coupling gear  114  can be engaged with the gear grooves  30   b  and the gear teeth  30   a  of the corresponding coupling gear  30 , respectively. When the gear teeth  114   a  and the gear grooves  114   b  of the coupling gear  114  are respectively engaged with the gear grooves  30   b  and the gear teeth  30   a  of the corresponding coupling gear  30 , i.e., these two gears  114  and  30  are in the connection state, the driving force of the coupling gear  30  is transmitted to the corresponding coupling gear  114  and as a result, the disk  112  of the coin ejection unit  110  connected to the said coupling gear  114  is drivingly rotated, thereby ejecting a coin or coins of the corresponding denomination from the said unit  110 . 
     In the structure example of  FIGS. 13A and 13B , the coupling gear  114  comprises engagement holes  114   d  formed along its circular rim at equal intervals. Each of the engagement holes  114   d  has two ends  114   e  and  114   f  formed apart from each other along the rim of the coupling gear  114 , The end  114   e  has a perpendicular face with respect to the upper surface of the coupling gear  114  and the end  114   f  has an inclined face with respect to the same upper surface, which means that the coupling gear  114  comprises the engagement holes  114   d  each having the perpendicular end  114   e  and the inclined end  114   f . This is to realize the function of a one-way clutch. Specifically, when the coupling gear  114  is in the non-connection state, there is a possibility that unintended slip of the coupling gear  114  occurs to result in a phenomenon of undesired dispensing of a coin or coins. The function of the one-way clutch is used for preventing such the phenomenon of undesired coin dispensing. For this reason, the engagement holes  114   d  may be omitted if the function of the one-way clutch is unnecessary. 
     The camshaft  43  (to which the four cams  44  are fixed and which is drivingly rotated by the second motor M 2 ) and the four cam followers  48  (which are displaced by the corresponding cams  44 ) constitute a coupling gear displacement mechanism  60 . The coupling gear displacement mechanism  60  displaces the coupling gears  30 ,  31   32 , and  33  (which correspond to the second coupling gears) between the predetermined “connection position” and the predetermined “non-connection position”. At the “connection position”, the coupling gears  30 ,  31   32 , and  33  are respectively engaged with the corresponding four coupling gears  114  (which correspond to the first coupling gears), which means that the coupling gears  30 ,  31   32 , and  33  and the corresponding four coupling gears  114  are in their non-connection state. At the “non-connection position”, engagement between the coupling gears  30 ,  31   32 , and  33  and the corresponding four coupling gears  114 . is released, which means that the coupling gears  30 ,  31   32 , and  33  and the corresponding four coupling gears  114  are in their non-connection state. 
     The engagement state (the connection state) and the disengagement state (the non-connection state) between the coupling gears  30 ,  31   32 , and  33  and the corresponding four coupling gears  114  are switched by the coupling gear displacement mechanism  60  in such the manner as explained above. To detect the switching situation, in other words, to detect which one of the first to fourth coin ejection units  110  is in the connection state, four detection members  45  and four optical sensors  46  are provided in the switching unit  40 . The four detection members  45  and the four optical sensors  46  are respectively provided for the first to fourth coin ejection units  110 . 
     As the optical sensors  46 , any known infrared sensors or the like may be used; however, any type of sensors other than the optical ones may be used for this purpose. It is sufficient for the sensors that they can detect the connection/disconnection of the first to fourth coin ejection units  110 . Here, the four detection members  45 , which are the same in shape and size, are fixed to the camshaft  43  at intervals, as shown in  FIG. 6 , for example. 
     In this embodiment, each of the four detection members  45  is formed by a circular member having a protrusion which protrudes outwardly from a part of the said member. The camshaft  43  (or the shaft member  43   a ) is inserted into the central hole of the said circular member and fixed at a predetermined position. The optical sensors  46  that correspond to the detection members  45 , which are the same in structure and function, are fixed on the inner surface of the frame body  42   a  at the opposite positions to the corresponding detection members  45 . Each of the sensors  46  has a gap formed between the light emitting part and the light receiving part thereof. When the protrusion of the detection member  45  is inserted into the gap, the infrared light emitted from the light emitting part toward the light receiving part is blocked by the said protrusion; as a result, the arrival of the protrusion of the said detection member  45  at the corresponding sensor  46  is detected. Due to this detection, it is judged that the coupling gear  30  in question and its corresponding coupling gear  114  are in the engagement state (i.e., the connection state). In the case where this engagement state needs to be maintained, the rotational driving of the second motor M 2  is stopped at the same time as the detection of the arrival of the said protrusion at the said sensor  46 . In this way, the coupling gear  30  and its corresponding coupling gear  114  are set in the engagement state (i.e., the connection state). As far as this engagement state is held, a coin or coins of a predetermined denomination which is/are stored in the corresponding coin ejection unit  110  is/are dispensed from the same unit  110 . When the aforementioned infrared light is not blocked by the said protrusion, it is judged that the coupling gear  30  in question and its corresponding coupling gear  114  are in the non-engagement state (i.e., the non-connection state). 
     In this embodiment, the state where the driving force of the first motor M 1  is not transmitted to all of the first to fourth coin ejection units  110  can be set. When the state where the driving force of the first motor M 1  is transmitted to any one of the first to fourth coin ejection units  110  (in other words, a coin is ejected from the relevant unit  110 ) is termed the “operable mode”, the state where the driving force of the first motor M 1  is not transmitted to all of the first to fourth coin ejection units  110  may be termed the “non-operable mode”. In the “non-operable mode”, all of the first to fourth coin ejection units  110  are mechanically disconnected from the driving mechanism  20 , as shown in  FIG. 21  and therefore, there arises an advantage that a desired one of the four coin ejection units  110  can be easily removed from the chassis  11  by sliding the desired unit  110  along the mounting surface  11   a . It is needless to say that this “non-operable mode” may be omitted. 
     In this embodiment, the shift or transition from the “operable mode” to the “non-operable mode” is realized by operating a lever  52  which is rockably provided on the front side face of the chassis  11 , as shown in  FIG. 14 . Specifically, the lever  52  having an operating member or piece  53  fixed to its back is rockably supported by a rocking shaft  55  fixed to the chassis  1 . The operating member or piece  53  of the lever  52  is displaced downward along with the rocking motion of the lever  52 . Since a frame rocking member  54  is fixed to the frame body  42   a  on the back side of the lever  52  in such a way as to be overlapped with the lever  52 , the frame rocking member  54  is pressed downward along with the rocking motion of the lever  52 . In this state, the entire frame  42  is slightly rocked forward around the two supporting shafts  41  which are disposed at the respective ends of the frame  42  and thus, the camshaft  43  which is supported by the frame  42  is slightly displaced upward and the distances between the four cams  44  and their corresponding four cam followers  48  are increased. As a result, as shown in  FIG. 7 , all of the branching parts  48   a  of the cam followers  48  are moved downward by the elastic forces of the relevant springs  47  disposed just below the corresponding cam receiving parts  48   a . Due to this lowering motion of the branching parts  48   a , the four driven gears  23 ,  25 ,  27 , and  29  and their corresponding coupling gears  30 ,  31 ,  32 , and  33  are moved downward collectively. In this state, the driving force of the first motor M 1  is no longer transmitted to all of the first to fourth coin ejection units  110  regardless of the positions of the protruding parts of the four cams  44 . This means that the transition to the “non-operable mode” from the “operable mode” is completed in this way. The return to the “operable mode” can be easily carried out by operating the lever  52  upward to its initial position. 
     Operation of Multi-Unit Coin Ejection Apparatus  1   
     Next, the operation of the multi-unit coin ejection apparatus  1  according to the embodiment of the present invention having the aforementioned structure will be explained below with reference to  FIG. 15 . 
       FIGS. 15A to 15D  show the situation change where the connection state and the non-connection state of the fourth coin ejection unit  110  are switched in order in accordance with the rotational position (the rotational angle) of the corresponding cam  44  included in the switching unit  40  of the multi-unit coin ejection apparatus  1  while the said cam  44  is rotated once. In the following explanation, the situation change that occurs while the camshaft  43  is rotated counterclockwise once, as shown in  FIGS. 15A to 15D , will be described. 
     First, as shown in  FIG. 15A , when the protruding part of the cam  44  is in a diagonally downward right direction, the cam receiving part  48   a  of the cam follower  48  corresponding to the said cam  44  is disposed at its upper non-connection position. This is because the said cam receiving part  48   a  is always pressed upward by the elastic force of the corresponding spring  47  which is just below the said cam receiving part  48   a , In this state, the branching part  48   b  of the said cam follower  48  is disposed at its lower non-connection position, and the coupling gear  114  of the fourth coin ejection unit  110  is apart or disconnected from the corresponding coupling gear  33  of the driving mechanism  20  and therefore, these two coupling gears  114  and  33  are in the non-connection state (the non-connection position). Accordingly, the driving force of the first motor M 1  is not transmitted to the coupling gear  114  of the fourth coin ejection unit  110 , which means that no coin ejection occurs from the said unit  110 . 
     Next, when the camshaft  43  is rotated counterclockwise by 90° from the position of  FIG. 15A , in other words, the phase of the camshaft  43  is advanced by 90°, the protruding part of the said cam  44  is turned to a diagonally upward right direction, as shown in  FIG. 15B . At this time, the cam receiving part  48   a  of the said cam follower  48  is disposed at its upper non-connection position, which is the same as the state of  FIG. 15A . In this state also, the branching part  48   b  of the said cam follower  48  is disposed at its lower non-connection position and therefore, the coupling gear  114  of the fourth coin ejection unit  110  is disconnected from the corresponding coupling gear  33  of the driving mechanism  20 , which means that these two coupling gears  114  and  33  are in the non-connection state (the non-connection position). For this reason, the driving force of the first motor M 1  is not transmitted to the coupling gear  114  of the fourth coin ejection unit  110  and no coin ejection occurs from the said unit  110 . This is the same as the state of  FIG. 15A . 
     Following this, when the camshaft  43  is further rotated counterclockwise by 90° from the position of  FIG. 15B , in other words, the phase of the camshaft  43  is advanced by 180° from the position of  FIG. 15A , the protruding part of the said cam  44  is turned to a diagonally upward left direction, as shown in  FIG. 15C . At this time also, the cam receiving part  48   a  of the said cam follower  48  is kept at its upper non-connection position, which is the same as the state of  FIG. 15A , In this state also, the branching part  48   b  of the said cam follower  48  is kept at its lower non-connection position and therefore, the coupling gear  114  of the fourth coin ejection unit  110  is kept disconnected from the corresponding coupling gear  33  of the driving mechanism  20 , which means that these two coupling gears  114  and  33  are kept in the non-connection state (the non-connection position). For this reason, in the state of  FIG. 15C  also, the driving force of the first motor M 1  is not transmitted to the coupling gear  114  of the fourth coin ejection unit  110  and no coin ejection occurs from the said unit  110 . 
     Finally, when the camshaft  43  is further rotated counterclockwise by 90° from the position of  FIG. 15C , in other words, the phase of the camshaft  43  is advanced by 270° from the position of  FIG. 15A , the protruding part of the said cam  44  is turned to a diagonally downward left direction, as shown in  FIG. 150 . At this time, the cam receiving part  48   a  of the said cam follower  48  is moved to its lower connection position, which is different from the states of  FIGS. 15A to 15C . This is because the said cam receiving part  48   a  of the said cam follower  48  is pressed downward by the protruding part of the said cam  44  against the elastic force of the corresponding spring  47 . Due to this downward motion of the said cam receiving part  48   a , the branching part  48   b  of the said cam follower  48  is moved to its upper connection position. In this connection position, the coupling gear  114  of the fourth coin ejection unit  110  is engaged or connected to the corresponding coupling gear  33  of the driving mechanism  20 , which means that these two coupling gears  114  and  33  are moved to the connection state (the connection position). For this reason, in the state of  FIG. 15D , the driving force of the first motor M 1  is transmitted to the coupling gear  114  of the fourth coin ejection unit  110  and coin ejection occurs from the said unit  110  in response to a dispensing instruction. 
     As explained above, due to the rocking motion of the cam  44  which is caused by the rotation of the camshaft  43 , the coupling gear  114  of the fourth coin ejection unit  110  is engaged with the corresponding coupling gear  33  of the driving mechanism  20  (i.e., both of the coupling gears  114  and  33  are moved to the connection position), as shown in  FIG. 20A , or disengaged from the corresponding coupling gear  3  of the driving mechanism  20  (i.e., both of the coupling gears  114  and  33  are moved to the non-connection position), as shown in  FIG. 20B . In this way, the coin ejection operation from the fourth coin ejection unit  110  can be performed only at the limited time when both of the coupling gears  114  and  33  are in the connection position. This is applicable to the first to third coin ejection units  110  also. 
     The situation where the engagement (connections) states between the four coupling gears  110  of the first to fourth coin ejection units  110  and the corresponding four coupling gears  30 ,  31 ,  32 , and  33  are changed by the rotation of the single camshaft  43  is shown in  FIGS. 16 to 19 . 
     In the state of  FIG. 16 , only the coupling gear  33  of the driving mechanism  20  corresponding to the fourth coin ejection unit  110  is displaced upward and only the fourth coin ejection unit  110  is in the connection state while the first to third coin ejection units  110  are in the non-connection state. In the state of  FIG. 17 , only the coupling gear  33  of the driving mechanism  20  corresponding to the third coin ejection unit  110  is displaced upward and only the third coin ejection unit  110  is in the connection state while the first, second, and fourth coin ejection units  110  are in the non-connection state. In the state of  FIG. 18 , only the coupling gear  33  of the driving mechanism  20  corresponding to the second coin ejection unit  110  is displaced upward and only the second coin ejection unit  110  is in the connection state while the first, third, and fourth coin ejection units  110  are in the non-connection state. In the state of  FIG. 19 , only the coupling gear  33  of the driving mechanism  20  corresponding to the first coin ejection unit  110  is displaced upward and only the first coin ejection unit  110  is in the connection state while the second to fourth coin ejection units  110  are in the non-connection state. In this way, any one of the first to fourth coin ejection units  110  can be selectively connected and driven by simply changing the phase (the rotational position) of the four cams  44 . 
     Concretely speaking, for example, in the case where a dispensing instruction for dispensing the amount of 630 YEN as the change, the control device (not shown) of the multi-unit coin ejection apparatus  1  controls or operates the switching unit  40  in accordance with the dispensing instruction in the following way: 
     Specifically, first, the first coin ejection unit  110  for ejecting coins of 500 YEN is selected as the transmission destination of the driving force of the first motor M 1  and driven by the first motor M 1 , thereby ejecting one coin of 500 YEN. Next, the second coin ejection unit  110  for ejecting coins of 100 YEN is selected as the transmission destination of the said driving force and driven, thereby ejecting one coin of 100 YEN. Furthermore, the third coin ejection unit  110  for ejecting coins of 10 YEN is selected as the transmission destination of the said driving force and driven, thereby ejecting three coins of 10 YEN successively. In this way, the aforementioned dispensing instruction for the amount of 630 YEN can be executed. 
     As explained above in detail, with the multi-unit coin ejection apparatus  1  according to the embodiment of the present invention, the first to fourth coin ejection units  110  are structured in such a way that any one of the first to fourth coin ejection units  110  is selectively driven by switching the transmission destination of the driving force of the commonly used first motor M 1  using the switching unit  40  in response to an instruction. The switching unit  40  comprises (i) the four coupling gears  114  (which correspond to the first coupling gears) respectively provided for the first to fourth coin ejection units  110 , (ii) the four coupling gears  30 ,  31 ,  32 , and  33  (which correspond to the second coupling gears) provided for the driving mechanism  20  so as to be engageable with the corresponding four coupling gears  114 , and (iii) the coupling gear displacement mechanism  60  that displaces the coupling gears  30 ,  31 ,  32 , and  33  between the predetermined connection position and the predetermined non-connection position. Here, the coupling gear displacement mechanism  60  comprises the camshaft  43  which is rotationally driven by the second motor M 2  and which has the four cams  44  assigned respectively to the first to fourth coin ejection units  110 ; and the cam followers  48  which are respectively engaged with the four coupling gears  114  and which are respectively displaced by the corresponding cams  44 . The four coupling gears  30 ,  31 ,  32 , and  33  are displaced between the connection position and the non-connection position according to the displacements of the corresponding cam followers  48  due to the rotations of the corresponding cams  44 . The coupling gear displacement mechanism  60  having such the structure as above is operated in such a way that a designated one of the first to fourth coin ejection units  110  is disposed at the connection position, thereby transmitting the driving force of the first motor M 1  to (the rotating disk  112  of) the designated one of the coin ejection units  110  in accordance with an instruction. 
     Accordingly, by using the coupling gear displacement mechanism  60 , a designated one of the first to fourth coin ejection units  110  where coins of a desired denomination are stored in the corresponding coin storing container  120  can be selectively disposed at the connection position while the remaining three coin ejection units  110  are disposed at the non-connection position. Thus, it is possible to transmit the driving force of the first motor M 1  to the designated coin ejection unit  110  alone, thereby ejecting one or more coins of the desired denomination from the said unit  110 . In other words, any amount of coins can be dispensed as desired by repeating the coin ejection operation necessary times while appropriately switching the transmission destination of the first motor M 1  among the first to fourth coin ejection units  110  according to the necessity. This means that it is unnecessary to control the permission and prevention of coin ejection in each of the first to fourth coin ejection units  110  individually even in the structure where these four coin ejection units  110  are driven by the first motor M 1  alone. 
     As a result, with the multi-unit coin ejection apparatus  1  according to the embodiment of the present invention, it is unnecessary to provide a mechanism for selectively ejecting one or more coins of a necessary denomination in each of the coin ejection units in response to a dispensing instruction, such as the shutter provided in each of the coin ejection units of the multi-unit coin ejection apparatus disclosed in the aforementioned Publication No. 6182787, in spite of using the structure where the first to fourth coin ejection units  110  are configured to be driven by the first motor M 1  alone. In other words, there is an advantage that coins of desired denominations can be selectively ejected from the first to fourth coin ejection units  110  as desired without using such the selective coin ejection mechanism as disclosed in the Publication No. 6182787. 
     Moreover, the switching unit  40  can be formed by the four coupling gears  114  (the first coupling gears) respectively provided for the first to fourth coin ejection units  110 , the four coupling gears  30 ,  31 ,  32 , and  33  (the second coupling gears) provided for the driving mechanism  20  so as to be engageable with the corresponding coupling gears  114 , and the coupling gear displacement mechanism  60  that displaces the coupling gears  30 ,  31 ,  32 , and  33  between the predetermined connection position and the predetermined non-connection position; in which the engagement and disengagement between the four coupling gears  114  and the corresponding four coupling gears  30 ,  31 ,  32 , and  33  can be carried out by simply operating the coupling gear displacement mechanism  60 . Accordingly, a simple structure which can be produced at a low cost, such as the rotationally driven camshaft  43  which is driven by the second motor M 2  and to which the four cams  44  are fixed at different phases, can be used for the coupling gear displacement mechanism  60 . Furthermore, as described above, it is unnecessary to provide a mechanism that controls the permission and prevention of coin ejection in each of the first to fourth coin ejection units  110  individually. 
     Accordingly, the structure of each of the first to fourth coin ejection units  110  can be simplified and these coin ejection units  110  can be produced at a low cost. Moreover, these coin ejection units  110  are unlikely to malfunction and are able to have desired durability easily. 
     Furthermore, the multi-unit coin ejection apparatus  1  according to the embodiment of the present invention has the following additional advantages in addition to the aforementioned advantages. 
     Specifically, with the multi-unit coin ejection apparatus  1 , each of the four coupling gears  114  (the first coupling gears) respectively provided for the first to fourth coin ejection units  110  is formed by a gear which is fixed to the rotational shaft  115  of the corresponding unit  110  and which has the gear teeth  114   a  and the gear grooves  114   b  on its side face. Each of the four coupling gears  30 ,  31 ,  32 , and  33  (the second coupling gears) provided for the driving mechanism  20  is formed by a gear which is fixed to the corresponding driven gear  23 ,  25 ,  27 , or  29  of the driving mechanism  20  and which has the gear grooves  30   b  and the gear teeth  30   a  on its side face that are engageable with the gear teeth  114   a  and the gear grooves  114   b  of the corresponding coupling gear  114 . Accordingly, there is an additional advantage that the structure for performing the engagement and disengagement between the four coupling gears  114  and the corresponding four coupling gears  30 ,  31 ,  32 , and  33  can be realized easily. 
     Moreover, with the multi-unit coin ejection apparatus  1 , e coupling gear displacement mechanism  60  comprises the camshaft  43  which is rotationally driven by the second motor M 2  and which has the four cams  44  assigned to the first to fourth coin ejection units  110 , and the four cam followers  48  which are respectively engaged with the four coupling gears  114  for the first to fourth coin ejection units  110  and which are displaced by the corresponding cams  44 . The four coupling gears  30 ,  31 ,  32 , and  33  are displaced between the connection position and the non-connection position according to displacements of the corresponding cam followers  48  due to rotations of the corresponding cams  44 , Accordingly, there is an additional advantage that the coupling gear displacement mechanism  60  can be realized using a very simple structure. 
     Moreover, with the multi-unit coin ejection apparatus  1 , the four sensors  46  that detect respectively the rotational positions (the rotational angles) of the four cams  44  fixed to the camshaft  43  are provided and the four detection members  45  are fixed to the same camshaft  43  at the corresponding positions to the fixed positions of the cams  44 , in which the sensors  46  detect optically the corresponding detection members  45 . Accordingly, there is an additional advantage that the rotational positions (the rotational angles) of the four cams  44  can be detected constantly with a simple structure and the coin ejection operation of the first to fourth coin ejection units  110  can be controlled precisely. 
     Moreover, with the multi-unit coin ejection apparatus  1 , the “non-operable mode” where the driving force of the first motor M 1  is not transmitted to all of the first to fourth coin ejection units  110  is provided in addition to the “operable mode” where the driving force of the first motor M 1  is transmitted to any one of the first to fourth coin ejection units  110 . Accordingly, there is an additional advantage that a desired one of the first to fourth coin ejection units  110  can be easily removed from the chassis  11  or exchanged for another unit by sliding the desired unit  110  along the mounting surface  11   a.    
     Moreover, with the multi-unit coin ejection apparatus  1 , the coupling gear displacement mechanism  60  is entirely supported by the two support shafts  41  so as to be rockable around the same shafts  41 , and the operable mode and the non-operable mode are switchable by simply rocking the whole coupling gear displacement mechanism  60  around the rocking shaft  55  through the manipulation of the lever  52  which is rockably supported by the chassis  1 . Accordingly, there is an additional advantage that the switching operation between the operable mode and the non-operable mode can be carried out easily. 
     Moreover, with the multi-unit coin ejection apparatus  1 , in the “non-operable mode”, all of the first to fourth coin ejection units  110  are detachable from the mounting surface  11   a  or the chassis  11  by moving a desired one of the first to fourth coin ejection units  110  along the mounting surface  11   a . Accordingly, there is an additional advantage that removal or exchange of these four coin ejection units  110  can be carried out easily according to the necessity. 
     Modifications 
     The aforementioned embodiment is an exemplary embodied example of the present invention. Thus, it is needless to say that the present invention is not limited to this embodiment and any other modification is applicable to the embodiment without departing the spirit of the invention. 
     For example, in the aforementioned embodiment, the coupling gears  30 ,  31 ,  32 , and  33  shown in  FIGS. 11A to 110 , each of which has the gear teeth  30   a  and the gear grooves  30   b  on its side face, are used for the driving mechanism  20 , and the four coupling gears  114  shown in  FIGS. 13A to 13B , each of which has the gear teeth  114   a  and the gear grooves  114   b  on its side face, are used for the four coin ejection units  110 . However, the present invention is not limited to this. It is needless to say that any coupling gear having a different structure from the structures shown in  FIGS. 11 and 13  may be used for this purpose if it enables the transmission of the driving force of the first motor M 1  to a desired one of the first to fourth coin ejection units  110  from the driving mechanism  20 . 
     In addition, in the aforementioned embodiment, as the coupling gear displacement mechanism  60 , the camshaft  43  which is rotationally driven by the second motor M 2  and which has the four cams  44  assigned to the first to fourth coin ejection units  110 , and the four cam followers  48  which are displaced by the corresponding cams  44  are used. However, the present invention is not limited to this. It is needless to say that any other combination than that of the camshaft  43  and the cam followers  48  may be used for this purpose if it enables the desired displacement between the coupling gears  30 ,  31 ,  32 , and  33  and the corresponding coupling gears  114 . 
     Furthermore, there is no limit to the structure of the coin ejection units  11  for the multi-unit coin ejection apparatus  1 . Any type of coin ejection unit having any structure can be used for this purpose if it enables the coin ejection of desired denominations using a rotatable disk  112  around the rotational shaft  115 . 
     INDUSTRIAL APPLICABILITY 
     The multi-unit coin ejection apparatus according to the present invention is applicable not only to coins as currency but also to coin equivalents such as token and medals. Moreover, the multi-unit coin ejection apparatus according to the present invention is applicable not only to any coin depositing/dispensing apparatus but also to any coin processing apparatus that necessitates selective ejection of coins of desired denominations. 
     While the preferred forms of the present invention have been described, it is to be understood that modifications will be apparent to those skilled in the art without departing from the spirit of the invention. The scope of the present invention, therefore, is to be determined solely by the following claims.