Patent Publication Number: US-2023152137-A1

Title: Automatic Dispenser for Mixed Measurement of Grain

Description:
TECHNICAL FIELD 
     The present disclosure relates to an automatic dispenser for mixed measurement of grain. 
     BACKGROUND ART 
     In a measurement rice bin of a related art, a measurer is mounted at a lower portion of a rice bin and a user may discharge a desired amount of rice. Most of the rice bins on the market includes only one rice storage bin and one rice measurer, so only one grain, such as rice may be used. Therefore, if a user wanted to mix grains other than rice, the user had to mix the grains and then put them in the rice bin. 
     Recently, in order to solve this drawback, a rice bin in which three grains are separately stored and a mixing ratio of each grain may be adjusted has been released. A measurer mounted in a rice bin of the related art is a cylindrical rotation type measurer that measures the amount of rice by the volume of rice contained in the measurer in a cylindrical rotary type, and the user directly rotates the measurer to operate it. 
     A product that automatically dispenses a fixed amount of feed using a motor, having a structure similar to that of a rice bin, has been released as a feed feeder for companion animals or livestock, but even in this case, only one feed storage bin is provided. An example of a prior art dispenser is shown in Korean Patent Laid-Open Publication No. 10-2021-0050381. 
     SUMMARY 
     An aspect of the present disclosure is to provide an automatic dispenser that has two or more storage bins and measurers, may automatically measure and discharge grains using one motor, and control a mixing ratio of grains. 
     In an aspect, there is provided an automatic dispenser for mixed measurement of grain, including a storage bin having a plurality of holes on a bottom surface and storing grains, a main measurer having a plurality of partitioned measurement compartments and rotatably installed at a position overlapping any one of a plurality of holes provided on the bottom surface of the storage bin, an auxiliary measurer having a plurality of partitioned measurement compartments and installed at a position overlapping the rest of the plurality of holes provided on the bottom surface of the storage bin, the measurement compartment being installed to be rotatable only in one direction with respect to the main measurer, a measurer housing installed below the main measurer and the auxiliary measurer and having a discharge port discharging grains introduced into the main measurer and the auxiliary measurer from the storage bin, and a motor rotating the main measurer in both directions, wherein only the main measurer is used or both the main measurer and the auxiliary measurer are used depending on a rotation direction of the motor. 
     The automatic dispenser for mixed measurement of grains according to the present disclosure has two or more storage bins and measurers and has a structure capable of automatically measuring and dispensing grains using one motor and capable of adjusting a mixing ratio of grain, thereby increasing user convenience. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is an exploded view of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  2    is a view illustrating a storage bin provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  3    is a view illustrating a lid of a storage bin provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  4    is a view illustrating a bottom of a storage bin provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  5    is a cross-sectional view illustrating installation of a sweeper provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  6    is a view illustrating a main measurer provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  7    is a view illustrating an auxiliary measurer provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  8    is a view illustrating a measurer housing provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  9    is a cross-sectional view illustrating an auxiliary measurer reverse rotation preventing portion of a measurer housing provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  10    is a view illustrating a lower surface of a rotating shaft of an auxiliary measurer provided in the automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  11    is a view illustrating a state in which a reverse rotation preventing portion of a measurer housing provided in the automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure prevents reverse rotation of an inner part of an auxiliary measurer; 
         FIG.  12    is a view illustrating a state in which a reverse rotation preventing portion of a measurer housing provided in the automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure permits forward rotation of an inner part of an auxiliary measurer; 
         FIG.  13    is a view illustrating a base and parts installed in the base of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  14    is a view illustrating rotation of a measurer when a motor of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure rotates forwardly; 
         FIG.  15    is a view illustrating rotation of a measurer when a motor of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure rotates reversely; 
         FIG.  16    is a cross-sectional view illustrating a discharge path of grains when a motor of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure rotates forwardly; 
         FIG.  17    is a view illustrating a discharge path of grains when a motor of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure rotates reversely; 
         FIG.  18    is a view illustrating a magnet and a magnet sensor of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure; 
         FIG.  19    is a view schematically illustrating a first arrangement example of a measurer of an automatic dispenser for mixed measurement of grains according to the present disclosure; 
         FIG.  20    is a view schematically illustrating a second arrangement example of a measurer of an automatic dispenser for mixed measurement of grains according to the present disclosure; 
         FIG.  21    is a view schematically illustrating a third arrangement example of a measurer of an automatic dispenser for mixed measurement of grains according to the present disclosure; 
         FIG.  22    is a view schematically illustrating a fourth arrangement example of a measurer of an automatic dispenser for mixed measurement of grains according to the present disclosure; and 
         FIG.  23    is a view schematically illustrating various measurement methods using the second arrangement example of a measurer of an automatic dispenser for mixed measurement of grains according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, the present disclosure will be described in more detail with reference to the drawings. 
       FIG.  1    is an exploded view of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. 
     The automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure includes a storage bin  100  storing grains, etc., and a main measurer  200  and an auxiliary measurer  300  installed at a lower portion of the storage bin  100 , measuring a certain amount of grains discharged through holes  121  and  122  provided in a bottom surface  120  of the storage bin  100 , and discharging the certain amount of grains. The main measurer  200  and the auxiliary measurer  300  are rotatably installed in a measurer housing  400 , and the measurer housing  400  includes discharge ports  410  and  420  discharging grains at positions that do not overlap the holes  121  and  122  of the bottom surface  120 . 
     The measurer housing  400  is coupled to a base  500 , and electrical components and a controller  530  controlling the electrical components are installed in the base  500 . A motor  600  providing rotational force to the measurers  200  and  300  is installed in the base  500 , and a shaft of the motor  600  is coupled to a main gear  610  through a shaft hole  520  of the base  500 . A base cover  540  covering the base  500  is coupled to a lower portion of the base  500 . In addition, a grain receiver  800  may be detachably coupled to the base  500  so that the user may move discharged grains. The grains discharged through the discharge ports  410  and  420  move to the grain receiver  800  along a discharge tube  700  installed in the base  500 . Here, the base  500  includes a communication hole  510  connected to the discharge tube  700  to deliver grains. 
       FIG.  2    is a view illustrating the storage bin provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. Referring to  FIGS.  1  and  2   , the storage bin  100  includes a side wall  110 , a bottom surface  120 , and a lid  130  to form a closed storage space. An internal space of the storage bin  100  is divided into a main storage compartment  113  and an auxiliary storage compartment  114  by a partition  112 . The partition  112  may be detachably coupled to the side wall  110  so that the main storage compartment  113  and the auxiliary storage compartment  114  may be distinguishably used, or may be used as a single space without distinction. In the case of using single grain, the storage bin  100  may be used as one space by removing the partition  112 , and in the case of mixedly measuring two or more grains, the storage bin  100  may be divided into two or more spaces by the partition  112 . To this end, a pair of fixing ribs  111   a  and  111   b  for fixing the partition  112  are formed on the walls facing each other inside the sidewall  110 . The partition  112  is fitted between the fixing ribs  111   a  and  111   b  to be fixed. Here, in order to accommodate the partition  112  in the side wall  110  when the partition  112  is not used, one of the fixing ribs  111   a  and  111   b  has an L-shaped bent shape, and the partition  112  is accommodated between the side wall  110  and the bent fixing rib  111   b.    
       FIG.  3    is a view illustrating the lid of the storage bin provided in the automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. 
     The lid  130  of the storage bin may include one or more sensors  132  on an upper surface thereof to measure a remaining amount of grains stored in the storage bin. In this case, an infrared sensor or the like may be used as the sensor  132 , and the remaining amount of grains may be measured by measuring a distance to a top surface of grains. Preferably, the sensor  132  may be provided at a position corresponding to each storage compartment so that the remaining amount of grains may be measured in each partitioned storage compartment. Therefore, in an embodiment of the present disclosure including the main storage compartment  113  and the auxiliary storage compartment  114 , two sensors  132  are installed on the lid. 
       FIG.  4    is a view illustrating a bottom of a storage bin provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure, and  FIG.  5    is a cross-sectional view illustrating installation of a sweeper provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. 
     Referring to  FIGS.  1  and  5   , the holes  121  and  122  through which grains are discharged from the storage compartments  113  and  114  are formed in the bottom surface  120  of the storage bin  100 . The holes  121  and  122  may be provided at corresponding positions of the storage compartments  113  and  114 , respectively, and two holes are provided in an embodiment of the present disclosure. Sweepers  123  and  124  are installed on at least one side of the holes  121  and  122  and protrude downward to sweep the grains discharged to the measurers  200  and  300  into a measurement compartment are installed. Since the sweepers  123  and  124  only located at a front of the measurers  200  and  300  in a rotation direction are substantially used, the sweeper  124  adjacent to the auxiliary storage compartment  114  in which the measurer  300  rotating only in one direction is mounted is installed only in a forward rotation proceeding direction. Since the main measurer  200  installed in the main storage compartment  113  may perform both forward and reverse rotations, the sweeper  123  is attached to both sides of the hole  121 . 
     The sweepers  123  and  124  are bent in an L-shape, an upper surface  123   a  is attached by a protrusion  123   c  coupled through the bottom surface  120 , and a sweeper surface  123   b  bent and extended downwardly through the hole  121  sweeps a top surface of grains input to the measurer  200  to be flattened to maintain the amount of grains in the measurer in as a fixed amount and prevents a grain from being caught between the measurer  200  and the bottom surface  120  of the storage bin  100  to hinder rotation of the measurer  200 . 
     The sweepers  123  and  124  may be formed of a soft and elastic material, such as rubber or silicone. 
     Meanwhile, the bottom surface  120  of the storage bin  100  includes rotor shaft holes  125  and  126  so that blade-type rotors  127  and  128  may be connected to the central axes of the respective measurers  200  and  300 . The blade-type rotors  127  and  128  may stir the grains in the storage bin  100 , while rotating together with the measurers  200  and  300 , so that the grains may be easily discharged through the holes  121  and  122 . In addition, the blade-type rotors  127  and  128  may stir the grains stored in the storage bin  100  to be flattened in the top surface, thereby increasing increases accuracy when detecting the remaining amount of the grains. Here, the blade-type rotors  127  and  128  include rotor shafts  127   a  and  128   a  coupled to the rotor shaft holes  125  and  126  and blades  127   b  and  128   b  extending to both sides of the rotor shafts  127   a  and  128   a . Here, cross-sections of the blades  127   b  and  128   b  becomes narrower toward a top so that the grains may easily pass over during rotation. In other words, the cross-sections of the blades  127   b  and  128   b  may have a triangular shape, and the lower surfaces of the blades  127   b  and  128   b  are in contact with the bottom surface  120  of the storage bin  100 . 
       FIG.  6    is a view illustrating a main measurer provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. 
     Referring to  FIGS.  1  and  6   , the main measurer  200  is installed in the measurer housing  400 . A lower groove (not shown) coupled to the main gear  610  of the motor  600  is formed at a lower portion of the central shaft  210  of the main measurer  200 , and an upper groove  214  to which the rotor shaft  127   a  of the blade-type rotor  127  is coupled is formed at an upper portion of the central shaft  210 . The main gear  610  and the lower groove are coupled to transmit a rotational force of the motor  600  to the main measurer  200 , the blade-type rotor  127 , while the rotor shaft  127   a  engaged with the upper groove  214  rotates, rotates to stir grains. 
     The main measurer  200  includes an outer ring  220  having a cylindrical shape concentric with the central shaft  210  and having gear teeth  222  formed on an outer circumferential surface thereof and a plurality of partitions  230  radially connecting the outer ring  220  to the central shaft  210 , like a spoke, and partitioning a space between the outer ring  220  and the central shaft  210  into the plurality of measurement compartments  202 . The main measurer  200  has to be installed at a position where the measurement compartment  202  overlaps the hole  121  below the main storage compartment  113  and the main discharge port  410  of the measurer housing  400 . 
     In addition, one or more magnets  250  may be provided to detect a rotation amount and whether the main measurer  200  is rotated. The magnet  250  is disposed on an inner circumferential surface of the outer ring  220 , and the number of installations of the magnet  250  may vary as needed. The main measurer  200  has a magnet accommodating portion  240  into which the magnet  250  may be inserted, and after the magnet  250  is inserted into the magnet accommodating portion  240 , the magnet accommodating portion  240  may be stopped with a rubber stopper  260  having elasticity to be fixed. 
       FIG.  7    is a view illustrating an auxiliary measurer provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. 
     The auxiliary measurer  300  has a form in which an outer part  320  is coupled to an outer circumferential surface of an inner part  310 , a ratchet protrusion  315  is formed at a lower end of the outer circumferential surface of the inner part  310 , and a ratchet gear  322  is formed at a lower end of the outer part  320  so that only one-way rotation is allowed for the outer part  320  with respect to the inner part  310 . 
     The inner part  310  includes a central shaft  312  as a center of rotation, a cylindrical outer ring  314  concentric with the central shaft  312  and having the ratchet protrusion  315  formed at the lower end of the outer circumferential surface, and a plurality of partitions  316  radially connecting the outer ring  324  to the central shaft  312 , like a spoke, and dividing a portion between the outer ring  314  and the central shaft  314  into a plurality of measurement compartments  311 . 
     The outer part  320  has a cylindrical shape coupled to the outer circumferential surface of the inner part  310 , having a ratchet gear  322  formed at a lower end, and having a tooth  324  engaged with the gear tooth  222  of the main measurer  200 . Accordingly, when the outer part  320  rotates clockwise, the ratchet protrusion  315  and the ratchet gear  322  are engaged with each other, and the inner part  310  rotates together with the outer part  320 . Meanwhile, when the outer part  320  rotates counterclockwise, the ratchet gear  322  of the outer part  320  moves on the ratchet protrusion  315  of the inner part  310  to allow relative rotation, so that the outer part  320  rotates to be idle with respect to the inner part  310 . 
     The auxiliary measurer  300  has to be installed at a position where the weighing compartment  311  overlaps the hole  122  below the auxiliary storage compartment  114  and the auxiliary discharge port  420  of the measurer housing  400 . 
       FIG.  8    is a view illustrating a measurer housing provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. 
     Referring to  FIGS.  1  and  8   , the measurer housing  400  includes a bottom surface  402  and a side wall  404 , and as described above, the bottom surface  402  may include the main discharge port  410  downwardly discharging grains introduced into the main measurer  200  and the auxiliary discharge port  420  downwardly discharging grains introduced into the auxiliary measurer  300 . 
     Also, the measurer housing  400  may have a gear hole  430  at an installation position of the main measurer  200  so that the main gear  610  connected to the motor  600  may pass therethrough to be connected to the main measurer  200 . A coupling shaft  440  for coupling a reverse rotation preventing portion (to be described below) is formed at an installation position of the auxiliary measurer  300 . The coupling shaft  440  protrudes toward the auxiliary measurer  300 . The coupling shaft  440  is preferably in the form of a hexagonal pillar to prevent rotation. 
       FIG.  9    is a cross-sectional view illustrating an auxiliary measurer reverse rotation preventing portion of a measurer housing provided in an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. 
     Referring to  FIGS.  8  and  9   , the reverse rotation preventing portion includes an elastic member  442  fitted to the coupling shaft  440  and having a lower end supported by the measurer housing  400 , a ratchet portion  444  supported to be movable up and down by an upper end of the elastic member  442  and having a coupling hole coupled to the coupling shaft  440 , and a stopper  446  limiting an upper position of the ratchet portion  444  to prevent the ratchet portion  444  from being released upwardly, and fixed to the coupling shaft  440 . Here, the coupling shaft  440  has an angular shape like a hexagonal pillar as described above so that the ratchet portion  444  may not rotate with respect to the coupling shaft  440 , and the coupling hole has a shape corresponding to the coupling shaft  440 . In an embodiment of the present disclosure, the coupling shaft  440  and coupling hole may have a hexagonal pillar and hexagonal hole shape, a quadrangular pillar or quadrangular hole shape, or a cylindrical shape in which a key hole is formed, as long as the coupling shaft  440  and the coupling hole have a shape that may prevent rotation. 
     The ratchet portion  444  does not rotate on the coupling shaft  440  and only moves up and down, and receives a force to move upward by the elastic member  442 , but the highest point is limited by the stopper  446 . 
       FIG.  10    is a view illustrating a lower surface of a rotating shaft of an auxiliary measurer provided in the automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure,  FIG.  11    is a view illustrating a state in which a reverse rotation preventing unit of a measurer housing provided in the automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure prevents reverse rotation of an inner part of an auxiliary measurer, and  FIG.  12    is a view illustrating a state in which a reverse rotation preventing unit of a measurer housing provided in the automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure permits forward rotation of an inner part of an auxiliary measurer. 
     A ratchet gear  313  is formed on a lower surface of the central shaft  312  of the inner part  310  of the auxiliary measurer, and a ratchet portion  444  of the reverse rotation preventing portion is pressed by the elastic member  442  to abut on the ratchet gear  313 . Accordingly, counterclockwise rotation of the inner part  310  is limited. Meanwhile, during clockwise rotation, rotation is allowed along an inclined surface of the ratchet portion  444  supported by the elastic member  442  and along an inclined surface of the rachet gear  313  of the central shaft  314  by the elastic member  442 , so that the rachet portion  444  is supported by the elastic member  442  to repeatedly move up and down. 
     When the outer part  320  rotates counterclockwise, relative rotation is allowed and the outer part  320  rotates idle with respect to the inner part  310 , but due to a frictional force of the inner part  310  and the outer part  320 , the inner part  310  may rotate along the outer part  320 , but counterclockwise rotation, i.e., reverse rotation, of the inner part  310  may be prevented due to the reverse rotation preventing portion. 
       FIG.  13    is a view illustrating a base and parts installed in the base of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. 
     As described above, the base  50  includes electrical components, such as the motor  600  and the magnet sensor  550 , and a controller  530  controlling the electrical components. Here, the shaft of the motor  600  passes through the shaft hole  520  of the base  500  and is coupled with the main gear  610  to provide rotational force to the measurers  200  and  300  and is fixed by a motor holder  620  installed on the base cover  540  covering a lower portion of the base  500 . In addition, in the base  500 , a grain receiver  800  may be detachably coupled to a lower portion of the discharge tube  700  to allow the user to move the discharged grains. The grains discharged through the discharge ports  410  and  420  move to the grain receiver  800  along the discharge tube  700  installed in the base  500 . Here, the base  500  includes the communication hole  510  connected to the discharge tube  700  to deliver grains. The discharge tube  700  is in the form of a hopper having an inclined surface  710  inclined to be low in the middle so as to easily discharge grains, and has a discharge port provided in the center. In addition, when the discharge tube  700  is coupled with a cooking device, such as an automatic rice cooker, when grains are automatically measured and discharged to the discharge port  720 , discharged grains may be transferred through a transfer unit, such as suction pressure or a screw method to be introduced into an inner pot in the cooking device. 
     In addition, the measurer housing  400  is coupled to an upper portion of the base  500 . 
       FIG.  14    is a view illustrating rotation of a measurer when a motor of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure rotates forwardly. 
     Hereinafter, forward rotation of the motor refers to a counterclockwise direction, and reverse rotation of the motor refers to a clockwise direction. Therefore, for the main measurer  200  rotating in the same direction as the motor, the counterclockwise direction, and in the case of the auxiliary measurer  300  engaged with the main measurer  200  and rotating in a direction opposite to the main measurer  200 , the clockwise direction is a reference direction of the forward direction. 
     When the motor rotates in the forward direction, the teeth  222  of the main measurer  200  and the teeth  324  of the auxiliary measurer  300  are engaged with each other to rotate. In the case of the auxiliary measurer  300 , as described above, since the outer part  320  cannot rotate in the clockwise direction with respect to the inner part  310 , the outer part  320  and the inner part  310  have to rotate together, and since the reverse rotation preventing portion allows the inner part  310  to rotate in a clockwise direction, the auxiliary measurer  300  may rotate when the motor rotates forwardly. Accordingly, grains are discharged through the main port  410  and the auxiliary port  420  of the housing  400 . 
       FIG.  15    is a view illustrating the rotation of the measurer when the motor of the automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure is reversely rotated. 
     When the motor rotates in a reverse direction, the teeth  222  of the main measurer  200  and the teeth  324  of the auxiliary measurer  300  are engaged with each other and the outer part  320  of the auxiliary measurer  300  rotates counterclockwise. Since the outer part  320  is allowed to rotate in a counterclockwise direction with respect to the inner part  310  and the reverse rotation preventing portion limits the counterclockwise rotation of the inner part  310 , when the motor rotates reversely, the inner part  310  of the auxiliary measurer  300  is stopped and only the outer part  320  rotates. Accordingly, the measurement compartment  311  formed in the inner part  310  and the blade-type rotor  128  connected to the central shaft  312  of the inner part  310  also do not rotate. 
     Therefore, grains are not discharged through the auxiliary discharge port  420  of the measurer housing  400 . 
       FIG.  16    is a cross-sectional view illustrating a discharge path of grains when a motor of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure rotates forwardly, and  FIG.  17    is a view illustrating a discharge path of grains when a motor of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure rotates reversely. 
     When the motor  600  rotates forwardly, grains stored in the storage bin  100  are introduced into the main measurer  200  and the auxiliary measurer  300  through the holes  121  and  122 , rotate to reach the main discharge port  410  and the auxiliary discharge port  420  of the measurer housing  400 , and then fall to the grain receiver  800  through the discharge tube  700 . 
     Meanwhile, when the motor  600  is rotated reversely, the grains stored in the storage bin  100  are introduced into the main measurer  200  through the hole  121 , rotate to reach the position of the main discharge port  410  of the measurer housing  400 , and then fall to the grain receive  800  through the discharge tube  700 . That is, the grains are discharged only through the main measurer  200 . 
     Here, the storage compartments  113  and  114  of the storage bin  100  may respectively have inclined surfaces  113   a  and  114   a  inclined toward the holes  121  and  122  so that grains may easily move to the plurality of holes  121  and  122  provided on the bottom surface. When the inclined surfaces  113   a  and  114   a  are provided, grains in the storage compartments  113  and  114  are discharged through the holes  121  and  122  and then slide down along the inclined surfaces  113   a  and  114   a  by their own weight, thereby preventing grains from remaining on the edge, without being discharged to the storage compartments  113  and  114 . 
       FIG.  18    is a view illustrating a magnet and a magnet sensor of an automatic dispenser for mixed measurement of grains according to an embodiment of the present disclosure. 
     As described above, one or more magnets  250  are installed in the main measurer  200  and a magnet sensor  550  is installed in the base  500 . When the main measurer  200  rotates and the magnet  250  approaches, the magnet sensor  550  detects the magnet  250 . The controller  530  verifies a rotation amount of the main measurer  200  by calculating the number of times the magnet  250  is detected by the magnet sensor  550 . The motor continues to rotate to weight and discharge grains until a set rotation amount is satisfied. If the measurers  200  and  300  are constrained and not rotated due to jamming of grains, this may be detected. For example, when a rotation signal is applied to the motor  600  but rotation of the magnet  250  of the main measurer  200  is not detected, the controller may determine this as a restraint state of the measurers  200  and  300 . Here, as the number of magnets  250  inserted into the main measurer  200  increases, precision of detection of a rotation amount increases. Therefore, precision of the measurement of the discharged grains may increase. 
     Hereinafter, a method of operating an automatic dispenser for mixed measurement of grains according to the present disclosure will be briefly described. 
     Referring to  FIGS.  1  to  18   , the user may input a grain discharge amount and a mixing ratio to the controller  530 . In a state in which different grains are stored in the main storage compartment  113  and the auxiliary storage compartment  114  of the storage bin  100 , the sensor  132  attached to the lid  130  of the storage bin  100  measures a height of a top surface of the grains stored in the storage bin  100  to check the amount of grains. If the remaining amount of grains is greater than an input amount, a next process is performed. When the remaining amount of grains is sufficient, the motor  600  rotates forwardly so that the main measurer  200  and the auxiliary measurer  300  rotate at the same time. Here, the magnet sensor  550  detects the magnet  250  of the main measurer  200  and verifies a discharge amount, while checking a rotation amount by a set value. After the amount of grains stored in the auxiliary storage compartment  114  is mixed as much as desired, the motor  600  rotates reversely to operate only the main measurer  200 , and thereafter, only the grains stored in the main storage compartment  113  are discharged. Even when grains are discharged from the main storage compartment  113 , the magnet sensor  550  detects the magnet  250  of the main measurer  200  and verifies a discharge amount, while checking a rotation amount by the set value. 
     When the number of teeth of the teeth  222  and  324  of the main measurer  200  and the auxiliary measurer  300  and an internal volume of the measurement compartments  202  and  311  are equal, the two measurers  200  and  300  discharge the same amount of grains when the motor  600  rotates forwardly, and thus, a discharge ratio of the grains is 1:1. Accordingly, when the motor  600  rotates reversely, only the main measurer  200  rotates and the inner part  310  of the auxiliary measurer  300  does not rotate, so that the discharge ratio of grains is 1:0. 
     Therefore, when the user sets a mixing ratio of the grains of the main measurer  200  and the auxiliary measurer  300  to (M:S) (here, M≥S), a ratio of forward rotation: reverse rotation may be set to S:(M−S). For example, when the user inputs a grain mixing ratio of 5:2, the controller  530  may set the ratio of forward rotation: reverse rotation to 2:3. 
     Also, even in the case of using single grains, instead of mixed grains, grains may be measured using both the main measurer  200  and the auxiliary measurer  300  so that the measurement may be performed more quickly and accurately. For example, assuming that a discharge ratio of the main measurer  200  and the auxiliary measurer  300  is 1:1, if only forward rotation is possible, grains may be discharged only in even multiple with respect to a measurement unit amount of the main measurer  200 , while the main measurer  200  and the auxiliary measurer  300  simultaneously rotate. However, when reverse rotation is possible, an amount of grains corresponding to an odd multiple of the unit amount of the main measurer  200  may be discharged. For example, in the case of discharging  5  times the unit amount of the main measurer  200 , the forward rotation may be performed twice and the reverse rotation may be performed once. Of course, even when the discharge ratio of the main measurer  200  and the auxiliary measurer  300  is not 1:1, it may be used to measure single grains in the same manner. 
       FIG.  19    is a view schematically illustrating a first arrangement example of a meter of an automatic dispenser for mixed measurement of grains according to the present disclosure. 
     As a measurer, one main measurer and one auxiliary measurer may be arranged. In the embodiment described above, the main measurer and the auxiliary measurer have the same size, but the main measurer may be larger or the auxiliary measurer may be larger. In this case, a mixing ratio of grains measured and discharged from each measurer varies according to a gear tooth ratio of the main measurer and the auxiliary measurer and a ratio of the internal volume of the measurement compartment. 
     If the size of the main measurer is larger and the internal volume ratio is 2:1 and the gear tooth ratio is 3:2, a discharge ratio of grains in the case of forward rotation is 4:3 and a discharge ratio of grains in the case of reverse rotation is 4:0. Therefore, when the grain mixing ratio is set to M:S, the ratio of forward rotation: reverse rotation is 4S:(3M−4S) (here, 3M≤4S). 
     If the size of the auxiliary measurer is larger and the ratio of the internal volume is 1:2 and the gear tooth ratio is 2:3, the discharge ratio of grains in the case of forward rotation is 3:4 and the discharge ratio of grains in the case of reverse rotation is 3:0. In this case, when the mixing ratio of grains is set to M:S, the ratio of forward rotation: reverse rotation is 3S:(4M−3S) (here, 4M≥3S). 
       FIG.  20    is a view schematically illustrating a second arrangement example of a meter of an automatic dispenser for mixed measurement of grains according to the present disclosure,  FIG.  21    is a view schematically illustrating a third arrangement example of a meter of an automatic dispenser for mixed measurement of grains according to the present disclosure, and  FIG.  22    is a view schematically illustrating a fourth arrangement example of a meter of an automatic dispenser for mixed measurement of grains according to the present disclosure. 
     The automatic dispenser for mixed measurement of grains according to the present disclosure may have one main measurer and two or more auxiliary measurers arranged around the main measurer. 
       FIG.  23    is a view schematically illustrating various metering methods using the second arrangement example of a meter of an automatic dispenser for mixed measurement of grains according to the present disclosure. 
     The measurers may be arranged so that both auxiliary measurers rotate together when the main measurer rotates forwardly, and both auxiliary measurers do not rotate when the main measurer rotates reversely. When the mixing ratio of grains is set to M:S1:S2 (here, S1=S2, M≥S1), the ratio of forward rotation: reverse rotation is S1: (M−S1)·X 
     In addition, the first auxiliary measurer rotates together when the main measurer rotates forwardly, and the second auxiliary measurer rotates together when the main measurer rotates reversely, thereby varying the types of mixed grains mixed with a main grain. When the mixing ratio of grains is set to M:S1:S2 (here, S1+S2=M), the ratio of forward rotation: reverse rotation is (M−S2):(M−S1). 
     In addition, when the main measurer rotates forwardly, the first and second auxiliary measurers may rotate together, and when the main measurer rotates reversely, the first auxiliary measurer may rotate together and the second auxiliary measurer may not rotate. Here, when the mixing ratio of grains is set to M:S1:S2 (here, M=S1, M≥S2), the ratio of forward rotation: reverse rotation is S2:(M−S2). 
     By using the third and fourth arrangement examples above, grains may be mixedly measured at various mixing ratios by adjusting the discharge ratios of the main measurer and the auxiliary measurers. 
     As described above, the present disclosure is not limited to the specific preferred embodiments described above, and anyone with ordinary skill in the art to which the invention pertains may use various methods without departing from the gist of the present disclosure as claimed in the claims. It goes without saying that modifications are possible, and such modifications are intended to be within the scope of the claims.