Abstract:
The present invention relates to a dishwasher and a method for controlling same, and the dishwasher may comprise a wash tub having an opening on at least one side thereof; a spray nozzle, provided in the interior of the wash tub, for spraying wash water; a reflecting module capable of moving in the interior of the wash tub, and reflecting the wash water sprayed by the spray nozzle; and a moving module, to which the reflecting module is detachably attached, for moving same in at least one direction.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a U.S. national stage application of PCT international application PCT/KR2014/012822, filed on Dec. 24, 2014 and claims the benefits of Korean Patent Application No. 10-2013-0169292, filed on Dec. 31, 2013, respectively, the contents are incorporated herein by reference. 
     
    
     BACKGROUND 
       [0002]    1. Technical Field 
         [0003]    The present disclosure relates to a dishwasher and a method for controlling the same. 
         [0004]    2. Background Art 
         [0005]    A dishwasher is a type of a home appliance for washing dishes by spraying wash water having high pressure onto dishes stored in a basket in a wash tub to remove foreign substances and the like remaining on the dishes. The dishwasher may include a main body having a wash tub provided inside it for washing dishes, a basket that stores dishes, a sump that retains wash water, a spray nozzle that sprays the wash water, and a pump that supplies the wash water in the sump to the spray nozzle. 
         [0006]    A spray structure that sprays wash water using a rotating spray nozzle may be provided in the dishwasher. The rotating spray nozzle may allow dishes to be washed by spraying the wash water onto dishes within a range of a radius of rotation while rotating by a water pressure. In addition, a spray structure that sprays wash water using a fixed nozzle fixed at one side of the wash tub may be provided in the dishwasher. The fixed nozzle may spray the wash water onto the dishes in a predetermined direction to allow the dishes to be washed. 
       SUMMARY 
       [0007]    It is an aspect to provide a dishwasher whose inner portion can be easily cleaned by a user and a method for controlling the same. 
         [0008]    To achieve the aspect mentioned above, a dishwasher and a method for controlling the same are provided. 
         [0009]    A dishwasher includes a wash tub having an opening on at least one side thereof; a spray nozzle provided inside the wash tub for spraying wash water; a reflecting module that is movable inside the wash tub and reflects the wash water sprayed by the spray nozzle; and a moving module to which the reflecting module is detachably coupled for moving the reflecting module in at least one direction. 
         [0010]    The moving module may include at least one rail, and a moving body that moves along the at least one rail and to which the reflecting module is detachably coupled. 
         [0011]    In this case, the dishwasher may further include a fastening member that couples the reflecting module to the moving body. 
         [0012]    Here, the fastening member may include a pin or a bolt, and the pin or the bolt may be inserted into or detached from a coupling groove formed at each of the reflecting module and the moving body. 
         [0013]    In addition, the fastening member may include a first coupling member provided at the reflecting module and a second coupling member provided at the moving body and coupled to the first coupling member. 
         [0014]    The dishwasher may further include a motor that generates a driving force and a belt that rotates by being connected to a drive pulley and an idle pulley to transmit the driving force of the motor to the moving module. 
         [0015]    The dishwasher may further include a control unit that determines at least one control mode among a plurality of control modes for controlling the dishwasher and controls the moving module so that the reflecting module moves in a direction in which the opening is installed when the determined control mode is a cleaning mode. 
         [0016]    The control unit may stop the reflecting module when the reflecting module is near the opening. 
         [0017]    The control unit may also control a door provided at the opening to be openable and closable when the reflecting module is stopped. 
         [0018]    In addition, the control unit may control the reflecting module to be detachable from the moving module when the reflecting module is stopped. 
         [0019]    Here, the plurality of control modes may include a dish washing mode, an operation standby mode, and the cleaning mode. 
         [0020]    The control unit may control the reflecting module to move toward the spray nozzle when the determined control mode is the operation standby mode. 
         [0021]    The control unit may control the spray nozzle to spray the wash water and the reflecting module to move inside the wash tub when the determined control mode is the dish washing mode. 
         [0022]    The spray nozzle may be provided in a direction in which the opening is installed in the wash tub or may be provided in an opposite direction opposite from the direction in which the opening is installed in the wash tub. 
         [0023]    The dishwasher may further include a main body with the wash tub built-therein. 
         [0024]    In addition, the dishwasher may further include an input unit that is provided outside the main body and receives at least one selected command among a plurality of modes. 
         [0025]    A method for controlling a dishwasher may control a dishwasher that includes a wash tub in which and an openable and closable opening is installed and a reflecting module that is provided inside the wash tub and is movable in at least one direction and is controlled according to at least one control mode among a plurality of control modes. 
         [0026]    The method for controlling the dishwasher includes determining the at least one control mode among the plurality of control modes, moving the reflecting module in a direction in which the opening of the wash tub is installed when the determined control mode is a cleaning mode, and stopping the reflecting module by the control unit when the reflecting module is near the opening. 
         [0027]    The method for controlling the dishwasher may further include controlling a door provided at the opening to be openable and closable when the reflecting module is stopped. 
         [0028]    The method for controlling the dishwasher may further include detaching the reflecting module from a moving module. In this case, the moving module may have the reflecting module detachably coupled thereto and may move the reflecting module in at least one direction. 
         [0029]    The plurality of control modes may include a dish washing mode, an operation standby mode, and a cleaning mode. 
         [0030]    The method for controlling the dishwasher may further include reflecting wash water sprayed by the spray nozzle spraying the wash water by the reflecting module while the reflecting module moves when the determined control modes is the dish washing mode. In this case, the spray nozzle may be provided inside the wash tub and spray the wash water onto the reflecting module. 
         [0031]    The method for controlling the dishwasher may further include moving the reflecting module toward a spray nozzle when the determined control mode is an operation standby mode. 
         [0032]    A moving module may include at least one rail and a moving body that moves along the at least one rail and to which the reflecting module is detachably coupled. 
         [0033]    According to a dishwasher and a method for controlling the same described above, a user can easily clean the inside of the dishwasher. 
         [0034]    Particularly, according to the dishwasher and the method for controlling the same described above, the user can easily clean a reflecting module inside the dishwasher such that foreign substances and the like existing on the reflecting module can easily be removed. 
         [0035]    Accordingly, dishes can be prevented from being contaminated by foreign substances and the like existing on the reflecting module when the dishwasher washes dishes, and, in addition, since a change of wash water reflecting direction due to foreign substances and the like can prevented, an effect of reconsidering efficiency of washing dishes dish washing can also be obtained. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0036]      FIG. 1  is a perspective view of an embodiment of a dishwasher. 
           [0037]      FIG. 2  is a perspective view illustrating a state in which a door of the dishwasher is open. 
           [0038]      FIG. 3  is a schematic cross-sectional view of the embodiment of the dishwasher. 
           [0039]      FIG. 4  is view illustrating an embodiment of a nozzle assembly. 
           [0040]      FIG. 5  is a perspective view illustrating an embodiment of a fixed nozzle assembly and a reflecting module. 
           [0041]      FIG. 6  is an exploded view of an embodiment of the reflecting module and a moving module. 
           [0042]      FIG. 7  is a view illustrating an embodiment of a rail, a belt, a drive pulley, and a rear holder of the moving module. 
           [0043]      FIG. 8  is a cross-sectional view of the embodiment of the rail, the belt, the drive pulley, and the rear holder of the moving module. 
           [0044]      FIG. 9  is a view illustrating an embodiment of the rail, the belt, an idle pulley, and a front holder of the moving module. 
           [0045]      FIG. 10  is a cross-sectional view of the embodiment of the rail, the belt, the idle pulley, and the front holder of the moving module. 
           [0046]      FIG. 11  is a view illustrating the belt and a belt holder of the moving module. 
           [0047]      FIG. 12  is a lateral cross-sectional view of an embodiment of the moving module. 
           [0048]      FIG. 13  is a view illustrating a first embodiment of the reflecting module and a moving body. 
           [0049]      FIG. 14  is a view illustrating a lower surface of the first embodiment of the reflecting module and the moving body. 
           [0050]      FIG. 15  is a lateral cross-sectional view illustrating the first embodiment of the reflecting module and the moving body. 
           [0051]      FIG. 16  is a view illustrating a second embodiment of the reflecting module and the moving body. 
           [0052]      FIG. 17  is a view illustrating a third embodiment of the reflecting module and the moving body. 
           [0053]      FIG. 18  is a view illustrating a fourth embodiment of the reflecting module and the moving body. 
           [0054]      FIG. 19  is a view illustrating a fifth embodiment of the reflecting module and the moving body. 
           [0055]      FIGS. 20 to 22  are views for describing an operation of the reflecting module. 
           [0056]      FIGS. 23 and 24  are views for describing a process of the reflecting module reflecting wash water. 
           [0057]      FIG. 25  is a view illustrating a flow channel structure of the dishwasher. 
           [0058]      FIG. 26  is a structural view of a dishwasher for describing a process of controlling the dishwasher. 
           [0059]      FIG. 27  is a view illustrating an embodiment of a user interface of the dishwasher. 
           [0060]      FIG. 28  is a flowchart of an embodiment of a method for controlling a dishwasher. 
           [0061]      FIGS. 29 and 30  are views for describing an operation of the dishwasher in an operation standby mode. 
           [0062]      FIGS. 31 to 33  are views for describing an operation of the reflecting module in a dish washing mode. 
           [0063]      FIGS. 34 to 39  are views for describing a process of cleaning the reflecting module in a cleaning mode. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0064]    Hereinafter, an overall structure of an embodiment of a dishwasher  1  will be generally described with reference to  FIGS. 1 to 3 .  FIG. 1  is a perspective view of an embodiment of a dishwasher,  FIG. 2  is a perspective view illustrating a state in which a door of the dishwasher is open, and  FIG. 3  is a schematic cross-sectional view of the embodiment of the dishwasher. 
         [0065]    Referring to what is illustrated in  FIG. 1 , the dishwasher  1  may include a main body  10  that forms an exterior and has a wash tub  30  provided therein. The main body  10  may be in the shape of a box as illustrated in  FIG. 1 . However, the shape of the main body  10  is not limited to that illustrated in  FIG. 1 , and may also be formed in the shape of a cylinder or a polygonal column, or may also be formed in the shape of a polygonal box besides a hexahedron. Other than above, the dishwasher  1  may be formed in various shapes that may be applied as an outer shape. 
         [0066]    A user interface may be installed at an outer surface of the main body  10 . A user interface  20  may include an input unit that receives a predetermined instruction from a user. An input unit  20   a  may include at least one of a keyboard, a mouse, a track-ball, a touch screen, a touch pad, a paddle, various types of levers or handles, a joystick, and other various input means. According to an embodiment, the input unit  20   a  may also be installed at an external device connected to the dishwasher  1 . The external device may include a personal computer (PC), a smartphone, a tablet PC, a personal digital assistant (PDA), a cellular phone, a remote controller, etc. The user interface  20  may include a display unit  20   b  for displaying various types of information to the user. The display unit  20   b  may include a display means using a plasma display panel (PDP), a light emitting diode (LED), an organic light emitting diode (OLED), a liquid crystal display (LCD), or the like. The display unit  20   b  may also express a three-dimensional image. 
         [0067]    A door  11  through which dishes may be inserted and withdrawn may be provided at a side of the main body  10 . The door  11  may be opened and closed by being moved in a predetermined direction as illustrated in  FIG. 2 . According to an embodiment, a hinge that rotates a body of the door  11  in a predetermined direction may be provided at one end of the door  11 . According to an embodiment, the door  11  may also be opened and closed by a sliding means. The door  11  may be provided in front of an opening  11   a  of a wash tub  30 , and the user may store dishes in the wash tub  30  through the open door  11  and the opening  11   a . A handle  11   b  may be provided at the door  11  so that the user can easily open and close the door  11 . According to an embodiment, the user interface  20  such as the input unit  20   a  or the display unit  20   b  may also be installed at the door  11 . The user interface  20  may also be installed near the handle  11   b.    
         [0068]    Referring to what is illustrated in  FIGS. 2 and 3 , the wash tub  30  in which dishes are washed may be provided inside the main body  10 . The wash tub  30  may be formed in a shape corresponding to the outer shape of the main body  10 . For example, the wash tub  30  may be formed in the shape of a box. Although an embodiment in which the wash tub  30  is formed in the shape of a hexahedral box is illustrated in  FIG. 3 , the shape of the wash tub  30  is not limited thereto. The wash tub  30  may also be formed in the shape of a cylinder or a polygonal column, or may also be formed in the shape of a polygonal box besides a hexahedron. In addition, the wash tub  30  does not always have to be formed in a shape corresponding to the outer shape of the main body  10 . 
         [0069]    The opening  11   a  through which dishes may be inserted and withdrawn in at least one direction may be provided at one surface of the wash tub  30 . The opening  11   a  may be opened and closed by the door  11  as illustrated in  FIGS. 2 and 3 . The wash tub  30  may include a plurality of walls  31  to  34  and a bottom plate  35 . Hereinafter, while describing the wash tub  30 , a direction and an area in which the bottom plate  35  is disposed will be referred to as a lower direction or a lower portion, and a direction opposite the direction in which the bottom plate  35  is disposed will be referred to as an upper direction or an upper portion. A direction in which the opening  11   a  is disposed will be referred as the front, and a direction opposite the direction in which the opening  11   a  is disposed will be referred to as the rear. In addition, a wall disposed at the opposite side of the opening  11   a  will be referred to as a rear wall  32 , a wall disposed at the left when viewed from the opening  11   a  will be referred to as a left wall  33 , and a wall disposed at the right when viewed from the opening  11   a  will be referred to as a right wall  34 . Furthermore, a wall disposed at the opposite side of the bottom plate  35  of the wash tub  30  will be referred to as an upper wall  31 . 
         [0070]    Dish accommodation units  12   a  and  12   b  in which dishes are mounted, a nozzle assembly  300  that sprays wash water toward the dish accommodation units  12   a  and  12   b  or a reflecting module  400 , the reflecting module  400  that reflects the wash water sprayed from spray nozzles  311 ,  313 , and  320  of the nozzle assembly  300  toward the dishes while moving inside the wash tub  30 , and a moving module  420  that moves the reflecting module  400  may be installed inside the wash tub  30 . 
         [0071]    The dish accommodation units  12   a  and  12   b  may be in the shape of a basket in which pins and the like are formed. The basket may be a wire rack formed of a wire so that the wash water can pass therethrough without pooling. The dish accommodation units  12   a  and  12   b  may be detached from the wash tub  30 . The dish accommodation units  12   a  and  12   b  may also be withdrawn outside of the opening  11   a  using a rail and a roller (not shown), etc. provided at the left wall  33  and the right wall  34  inside the wash tub  30 . The withdrawal of the dish accommodation units  12   a  and  12   b  may be performed manually or automatically. The dish accommodation units  12   a  and  12   b  may include an upper dish accommodation unit  12   a  disposed at an upper portion of the wash tub  30  and a lower dish accommodation unit  12   b  disposed at a lower portion of the wash tub  30 . 
         [0072]      FIG. 4  is a view illustrating an embodiment of a nozzle assembly. Referring to what is illustrated in  FIG. 4 , the nozzle assembly  300  may include an upper rotary nozzle assembly  311  provided at the upper portion of the wash tub  30 , a middle rotary nozzle assembly  313  provided at a central portion of the wash tub  30 , and a fixed nozzle assembly  320  provided at the lower portion of the wash tub  30 . Each of the nozzle assemblies  311 ,  313 ,  330 , and  340  may spray wash water with high pressure to wash dishes. 
         [0073]    The upper rotary nozzle assembly  311  may be provided above the upper dish accommodation unit  12   a  and spray the wash water toward the upper dish accommodation unit  12   a  while rotating by a water pressure. A spray hole  312  through which wash water is sprayed may be provided at a lower end of the upper rotary nozzle assembly  311  as illustrated in  FIG. 2 . The upper rotary nozzle assembly  311  may directly spray wash water toward the dishes stored in the upper dish accommodation unit  12   a.    
         [0074]    The middle rotary nozzle assembly  313  may be disposed between the upper dish accommodation unit  12   a  and the lower dish accommodation unit  12   b . The middle rotary nozzle assembly  313  may spray the wash water in upper and lower directions while rotating by the water pressure like the upper rotary nozzle assembly  311 . A rotational direction of the middle rotary nozzle assembly  313  may be the same as or different from that of the upper rotary nozzle assembly  311 . Spray holes  314  may be provided at an upper end and a lower end of the middle rotary nozzle assembly  313 . The wash water may be sprayed onto the dishes accommodated in the upper dish accommodation unit  12   a  and the lower dish accommodation unit  12   b  through the spray holes  314 . 
         [0075]    The fixed nozzle assembly  320  may be fixed at one side of the wash tub  30  as illustrated in  FIG. 3 . The fixed nozzle assembly  320  may be disposed adjacent to the rear wall  32  of the wash tub  30 .  FIG. 5  is a perspective view illustrating the embodiment of the fixed nozzle assembly and the reflecting module. As illustrated in  FIG. 5 , the fixed nozzle assembly  320  may include a left fixed nozzle  330  and a right fixed nozzle  340 . A plurality of spray holes  331  and  341  arranged in a horizontal direction may be provided at each of the left fixed nozzle  330  and the right fixed nozzle  340 . The spray holes  331  and  341  may spray the wash water toward the front of the wash tub  30 . According to an embodiment, the fixed nozzle assembly  320  may spray the wash water independent of the rotary nozzle assemblies  311  and  313 . Consequently, the dishwasher  1  may also perform dish washing only with wash water sprayed in a particular direction. In addition, the left fixed nozzle  330  and the right fixed nozzle  340  of the fixed nozzle assembly  320  may also spray wash water independent of each other. Consequently, the dishwasher  1  may be subdivided into particular areas. 
         [0076]    The wash water sprayed by the fixed nozzle assembly  320  may be reflected toward the dishes by the reflecting module  400  provided in front of the spray holes  331  and  341 . The reflecting module  400  may longitudinally extend in the horizontal direction of the wash tub  30  to be able to reflect the wash water sprayed by the plurality of spray holes  331  and  341  of the fixed nozzle assembly  320  as illustrated in  FIG. 5 . In other words, one end portion in a longitudinal direction of the reflecting module  400  may be provided to be adjacent to the left wall  33  of the wash tub  30 , and the other end portion in the longitudinal direction of the reflecting module  400  may be provided to be adjacent to the right wall  34  of the wash tub  30 . The reflecting module  400  may linearly reciprocate along front and rear directions of the wash tub  30 . Consequently, the spray structure that includes the fixed nozzle assembly  320  and the reflecting module  400  may wash all areas of the wash tub  30  without a blind spot. This is differentiated from the case of a rotary nozzle in which wash water can only be sprayed within a boundary of a radius of rotation. 
         [0077]    The reflecting module  400  may reflect the wash water sprayed by the fixed nozzle assembly  320  in the upper direction or the lower direction. When the fixed nozzle assembly  320  is disposed below the lower dish accommodation unit  12   b  as illustrated in  FIG. 5 , the reflecting module  400  may reflect the sprayed wash water in the upper direction to allow the wash water to reach dishes stored in the upper dish accommodation unit  12   a  or dishes stored in the lower dish accommodation unit  12   b . When the fixed nozzle assembly  320  is disposed between the upper dish accommodation unit  12   a  and the lower dish accommodation unit  12   b , the reflecting module  400  may reflect the wash water in the upper direction or the lower direction to allow the wash water to be transferred to dishes stored in the upper dish accommodation unit  12   a  or the lower dish accommodation unit  12   b . When the fixed nozzle assembly  320  is disposed above the upper dish accommodation unit  12   a , the reflecting module  400  may reflect the wash water in the lower direction to allow the wash water to be transferred to the dishes stored in the upper dish accommodation unit  12   a  or the lower dish accommodation unit  12   b.    
         [0078]    The wash water sprayed by the left fixed nozzle  330  may be reflected only to a left area of the wash tub  30  by the reflecting module  400 , and the wash water sprayed by the right fixed nozzle  340  may be reflected only to a right area of the wash tub  30  by the reflecting module  400 . In this case, when the left fixed nozzle  330  and the right fixed nozzle  340  of the fixed nozzle assembly  320  spray the wash water independent of each other, a left side and a right side of the dishwasher  1  may be separately washed independent of each other. Of course, washing areas of the dishwasher  1  may be further subdivided and separately washed as necessary. 
         [0079]      FIG. 6  is an exploded view of an embodiment of the reflecting module and a moving module. The moving module  420  may move the reflecting module  400  in at least one direction. The moving module  420  may include a rail assembly  430 , a moving body  490  that moves along a rail  440  of the rail assembly  430 , and a motor  530  that generates a driving force for moving the moving body  490 . 
         [0080]    The rail assembly  430  may include the rail  440  that guides the movement of the reflecting module  400  and has an inner space  441 , a drive pulley  500  that rotates by being connected to the motor  530 , a belt  520  that rotates by being connected to the drive pulley  500  and is disposed in the inner space  441  of the rail  440 , and an idle pulley  510  connected to the belt  520  to rotatably support the belt  520 . In addition, the rail assembly  430  may also include a rear holder  450  that rotatably supports the drive pulley  500  and is coupled to a rear end portion of the rail  440 , and a front holder  460  that rotatably supports the idle pulley  510  and is coupled to a front end portion of the rail  440 . 
         [0081]    The rail  440  may be formed with a metal material. The rail  440  may be provided to longitudinally extend in front and rear directions at the center with respect to the left wall  33  and the right wall  34  of the wash tub  30 . According to an embodiment, the rail assembly  430  may include one rail  440  as illustrated in  FIG. 5  or may also include a plurality of rails. The rail  440  may have a pipe shape in which an opening  445  is formed at a lower portion. For example, as illustrated in  FIG. 6 , the rail  440  may include the inner space  441 , an upper wall  442 , a plurality of lower walls  444   a  and  444   b  spaced apart from each other, both side walls  443 , and the lower opening  445  formed between the plurality of lower wall  444   a  and  444   b . The lower opening  445  may be formed to be extended from one end portion to the other end portion in a longitudinal direction of the rail  440 . When the rail  440  has the shape above, since the belt  520  may be disposed in the inner space  441  of the rail  440 , an operation of the belt  520  being interfered with due to coming into contact with dishes in the wash tub  30  or the belt  520  being corroded due to coming into contact with the wash water in the wash tub  30  may be prevented. In addition, the driving force of the belt  520  may be transmitted to the reflecting module  400  through the opening  445 . 
         [0082]    The belt  520  may be disposed in the inner space  441  of the rail  440 . The belt  520  may form a closed loop by being wound around the drive pulley  500  and the idle pulley  510  and may rotate along a rotational direction of the motor  530  when the motor  530  operates. The belt  520  may be formed of a resin material including aramid fibers. A toothed form  521  that transmits the driving force of the belt  520  to a belt holder  480  may be formed at an inner surface of the belt  520 . 
         [0083]      FIG. 7  is a view illustrating an embodiment of a rail, a belt, a drive pulley, and a rear holder of the moving module, and  FIG. 8  is a cross-sectional view of the embodiment of the rail, the belt, the drive pulley, and the rear holder of the moving module. According to an embodiment, the drive pulley  500  may include a shaft connection unit  503  that receives a driving force by being connected to a rotary shaft  501  and a drive shaft  531  of the motor  530  and a belt coupling unit  502  to which the belt  520  is coupled. The rear holder  450  may be coupled to the rear end portion of the rail  440 . The rear holder  450  may rotatably support the drive pulley  500 . According to an embodiment, the rear holder  450  may include a pulley support surface  451  that supports the rotary shaft  501  of the drive pulley  500 , a rail support surface  452  that supports the rear end portion of the rail  440 , and a bottom plate fastening groove  453  for being coupled to a bottom plate cover  600 . According to an embodiment, the rear holder  450  may also include a bottom plate fastening protrusion (not shown) instead of the bottom plate fastening groove  453 . 
         [0084]      FIG. 9  is a view illustrating an embodiment of the rail, the belt, an idle pulley, and a front holder of the moving module, and  FIG. 10  is a cross-sectional view of the embodiment of the rail, the belt, the idle pulley, and the front holder of the moving module. The idle pulley  510  may include a rotary shaft  511  and a belt coupling unit  512  to which the belt  520  is coupled. The front holder  460  may include a front top holder  461 , a front bottom holder  465  coupled to a lower portion of the front top holder  461 , and a pulley bracket  467  disposed between the front top holder  461  and the front bottom holder  465 . The front top holder  461  may include a pulley support surface  462  that supports the rotary shaft  511  of the idle pulley  510 , and a rail support surface  463  that supports the front end portion of the rail  440 . The front bottom holder  465  may be coupled to the lower portion of the front top holder  461  by a locking structure. According to an embodiment, the front bottom holder  465  may include a bottom plate coupling protrusion  466  coupled to the bottom plate  35  of the wash tub  30 . According to another embodiment, the front bottom holder  465  may also include a bottom plate fastening groove (not shown) for coupling to the bottom plate  35  of the wash tub  30 . The pulley bracket  467  may be movably provided along the longitudinal direction of the rail  440  and may rotatably support the idle pulley  510 . The pulley bracket  467  may include a pulley support surface  468  that supports the rotary shaft  511  of the idle pulley  510 . 
         [0085]    The rail  440 , the belt  520 , the drive pulley  500 , the rear holder  450 , the idle pulley  510 , and the front holder  460  may be assembled to each other by a tension of the belt  520 . In other words, the drive pulley  500  is pressed in a direction approaching the rail  440  by the tension of the belt  520 , and a force is transmitted to the rear holder  450  through the pulley support surface  451  of the rear holder  450  such that the rear holder  450  is adhered and coupled to the rear end portion of the rail  440 . In addition, the idle pulley  510  is pressed in a direction approaching the rail  440  by the tension of the belt  520 , and a force is transmitted to the front holder  460  through the pulley support surface  462  of the front holder  460  such that the front holder  460  is adhered and coupled to the front end portion of the rail  440 . Meanwhile, the front holder  460  may further include an elastic member  470  for maintaining the tension of the belt  520 . The elastic member  470  may also be provided at the rear holder  450 . The elastic member  470  may provide a function of preventing the tension of the belt  520  from decreasing due to thermal expansion of the belt  520  caused by hot air inside the wash tub  30 . One end portion of the elastic member  470  may be supported by the front holder  460 , and the other end portion of the elastic member  470  may be supported by the pulley bracket  467 . For this, elastic member support surfaces  464  and  469  may be respectively formed at the front holder  460  and the pulley bracket  467 . The elastic member  470  may be a compression spring. 
         [0086]      FIG. 11  is a view illustrating the belt and a belt holder of the moving module. The moving body  490  may include a belt holder  480  that may be disposed in the inner space  441  of the rail  440  to linearly reciprocate by being coupled to the belt  520 , and a reflecting module holder  490   a  disposed outside the rail  440  to linearly reciprocate by being coupled to the belt holder  480  and to which the reflecting module  400  is detachably coupled. The belt holder  480  and the reflecting module holder  490   a  may be coupled and fixed by a fastening member  490   b  such as a bolt. 
         [0087]    Like the belt  520 , the belt holder  480  may be disposed in the inner space  441  of the rail  440 . A toothed form coupling part  481  coupled to the toothed form  521  of the belt  520  may be provided at the belt holder  480  so that the belt holder  480  moves according to movement of the belt  520 . In addition, the belt holder  480  may include legs  482  and  483  supported by the rail  440 . The legs  482  and  483  may include side legs  482  that protrude sideward to be supported by the side walls  443  of the rail  440  and at least one lower leg  483  that protrudes downward to be supported by the lower wall  444  of the rail  440 . The side legs  482  may be provided to be elastically deformable to reduce noise and vibration due to collision and friction with the rail  440  when the belt holder  480  moves and allow the belt holder  480  to smoothly move. The side legs  482  may be an elastic body of one type of a plate spring. The belt holder  480  may also include a fastening structure  484 . The fastening structure  484  of the belt holder  480  may include a fastening hole  485  into which the fastening member  490   b  is inserted to be coupled to the reflecting module holder  490   a.    
         [0088]    The reflecting module holder  490   a  may be coupled to the belt holder  480  to move together with the belt holder  480  and may transmit the driving force of the belt holder  480  to the reflecting module  400 .  FIG. 12  is a lateral cross-sectional view of an embodiment of the moving module. As illustrated in  FIG. 8 , the reflecting module holder  490   a  may be provided to surround an outer surface of the rail  440 . According to an embodiment, the reflecting module holder  490   a  may also surround the entire outer surface of the rail  440  or may surround only a part of the outer surface. The reflecting module holder  490   a  may be coupled to the belt holder  480  through the lower opening  445  of the rail  440 . The reflecting module holder  490   a  may have a fastening hole  490   c . The fastening hole  490   c  of the reflecting module holder  490   a  may be fastened to the fastening hole  485  of the belt holder  480  by the fastening member  490   b . Accordingly, the reflecting module holder  490   a  and the belt holder  480  may be coupled to each other. The reflecting module holder  490   a  may include a second coupling member such as a coupling protrusion unit  491  coupled to a first coupling member of the reflecting module  400 . According to an embodiment, the second coupling member may be formed at an outer surface of the reflecting module holder  490   a . The first coupling member and the second coupling member may be detached from each other. 
         [0089]    Hereinafter, the reflecting module  400  and several embodiments in which the reflecting module  400  and the moving body  490  are detachably coupled to each other will be described with reference to  FIGS. 13 to 19 . 
         [0090]      FIG. 13  is a view illustrating a first embodiment of the reflecting module and the moving body, and  FIG. 14  is a view illustrating a lower surface of the reflecting module. According to  FIGS. 13 and 14 , the reflecting module  400  may include a reflecting unit  401 , an upper support unit  405   a , a rotation locking part  409 , a rear support unit  405   b , a reinforcing rib  406 , a horizontal support unit  407   a , a vertical support unit  407   b , and a roller  403 . 
         [0091]    The reflecting unit  401  may reflect the wash water sprayed by the fixed spray nozzle assemblies  330  and  340 . The reflecting unit  401  may include reflecting surfaces  402   a  and  402   b  obliquely provided to reflect the wash water. The reflecting surfaces  402   a  and  402   b  may have different slopes to reflect the wash water at different angles. The reflecting surfaces  402   a  and  402   b  having the different slopes may be alternately arranged in the longitudinal direction as illustrated in  FIG. 13 . 
         [0092]    The upper support unit  405   a  may be provided by being bent from an upper end of the reflecting unit  401 . The rotation locking part  409  may be pressed by a rotation guide ( 610  in  FIGS. 20 and 21 ) of the bottom plate cover  600  to allow the reflecting module  400  to rotate. The rear support unit  405   b  may be provided to support the upper support unit  405   a  and the reflecting unit  401 , and the reinforcing rib  406  may be provided to reinforce strengths of the reflecting unit  401 , the upper support unit  405   a , and the rear support unit  405   b . The horizontal support unit  407   a  and the vertical support unit  407   b  may be supported by an upper surface and a side surface of the moving body  490  to allow the reflecting module  400  to stably move along with the movement of the moving body  490 . The roller  403  may be provided at both longitudinal ends of the reflecting module  400  or at any position on a lower end of the reflecting module  400  and may provide a function of allowing smooth movement of the reflecting module  400 . When the roller  403  is provided at the reflecting module  400 , a roller support unit for supporting the roller  403  may be provided at the bottom plate  35  of the wash tub  30 . The upper support unit  405   a , the rotation locking part  409 , the rear support unit  405   b , the reinforcing rib  406 , the horizontal support unit  407   a , the vertical support unit  407   b , and the roller  403  may be omitted as necessary. 
         [0093]    According to the embodiment, the reflecting unit  401  may include a rail coupling unit  410  as illustrated in  FIGS. 13 and 14 . The rail coupling unit  410  may be formed near the center in a longitudinal direction of the reflecting unit  401 . However, the rail coupling unit  410  is not limited to being formed near the center in the longitudinal direction of the reflecting unit  401 , it may also be provided on at least one of the both ends of the reflecting unit  401 , and it may also be provided on at least one of the center and the both ends of the reflecting unit  401 . In addition, only one rail coupling unit  410  or two or more rail coupling units  410  may be provided at the reflecting module  400 . The rail coupling unit  410  may include a first coupling member for coupling to a second coupling member provided at the moving body  490 . The first coupling member may be a coupling groove  411 . The rail coupling unit  410  may further include a rotation stopper unit  408 . The rotation stopper unit  408  may provide a function of limiting a range of rotation of the reflecting module  400  when the reflecting module  400  rotates by the rotation guide  610  of the bottom plate cover  600 . 
         [0094]      FIG. 15  is a lateral cross-sectional view illustrating the first embodiment of the reflecting module and the moving body. 
         [0095]    As illustrated in  FIGS. 13 and 15 , according to the first embodiment, the first coupling member may be the first coupling groove  411 . As illustrated in  FIG. 13 , the first coupling groove  411  may be provided as a pair of grooves at the rail coupling unit  410  of the reflecting module  400 . According to the embodiment, the first coupling groove  411  of the rail coupling unit  410  may be formed between first elastic hooks  411   a  and  411   b  which are elastically deformable. The first coupling groove  411  may have a circular shape. According to the first embodiment, the second coupling member of the reflecting module holder  490   a  of the moving body  490  may be a first coupling protrusion unit  491  that protrudes sideward. The first coupling protrusion unit  491  may be in a cylindrical shape as illustrated in  FIG. 15 . The first coupling protrusion unit  491  may be provided at the moving body  490  corresponding to the first coupling groove  411  of the rail coupling unit  410 . The first coupling protrusion unit  491  may be provided as a pair of units as illustrated in  FIG. 13 . According to an embodiment, the first coupling protrusion unit  491  may also include a first coupling shaft part  491   a  and a first deviation prevention part  491   b  formed at an end portion of the first coupling shaft part  491   a  to prevent the deviation of the reflecting module  400 . The first elastic hooks  411   a  and  411   b  may be slightly opened during a process in which the coupling shaft part  491   a  of the moving body  490  is inserted into or deviated from the first coupling groove  411  of the reflecting module  400  to allow the first coupling shaft part  491   a  of the moving body  490  to move up to a position of the first coupling groove  411 . When the first coupling shaft part  491   a  of the moving body  490  has moved up to the position of the first coupling groove  411 , the first elastic hooks  411   a  and  411   b  may be restored to their original states. Consequently, the reflecting module  400  may be mounted on or detached from the moving body  490 . When the first coupling protrusion unit  491  is in a cylindrical shape and the first coupling groove  411  is in a circular shape, the first coupling member may rotate about the first coupling shaft part  491   a.    
         [0096]      FIG. 16  is a view for describing a second embodiment of the reflecting module and the moving body. 
         [0097]    As illustrated in  FIG. 16 , according to the second embodiment, the first coupling member may be a second coupling protrusion unit  412 . The second coupling protrusion unit  412  may be provided as a pair of units at the rail coupling unit  410  of the reflecting module  400 . According to an embodiment, the second coupling protrusion unit  412  may also include a second coupling shaft part  412   a  and a deviation prevention unit  412   b  formed at an end portion of the second coupling shaft part  412   a  to prevent the deviation of the reflecting module  400 . According to the second embodiment, the second coupling member of the reflecting module holder  490   a  of the moving body  490  may be a second coupling groove  492 . The second coupling groove  492  may also be provided as a pair of grooves at the moving body  490  corresponding to the second coupling protrusion unit  412  of the rail coupling unit  410 . According to an embodiment, like the first coupling groove  411  of the rail coupling unit  410  of  FIG. 15 , the second coupling groove  492  may be formed between second elastic hooks  492   a  and  492   b  which are elastically deformable. Similar to what is described above, the second elastic hooks  492   a  and  492   b  of the second coupling groove  492  of the moving body  490  may be elastically deformed during a process in which the second coupling shaft part  412   a  of the rail coupling unit  410  is inserted into or deviated from the second coupling groove  492  of the moving body  490  and may be restored to their original states when the insertion or the deviation is completed. As a result, the reflecting module  400  may be mounted on or detached from the moving body  490 . Similar to the case of the first embodiment, the first coupling member may rotate about the second coupling shaft part  412   a.    
         [0098]      FIG. 17  is a view for describing a third embodiment of the reflecting module and the moving body. 
         [0099]    As illustrated in  FIG. 17 , according to the third embodiment, the first coupling member of the reflecting module  400  may be a first coupling plate unit  413  that includes a flat plate  413   b  and a third coupling groove  413   a  provided on the flat plate  413   b . The first coupling plate unit  413  may be provided at the rail coupling unit  410 . One first coupling plate unit  413  may be provided at the rail coupling unit  410 , and a plurality of first coupling plate units  413  may also be provided as illustrated in  FIG. 17 . The second coupling member of the moving body  490  may be provided at an outer surface of the moving body  490  and may be a fourth coupling groove  493  corresponding to the third coupling groove  413   a . The number of fourth coupling grooves  493  may be singular or plural. The third coupling groove  413   a  and the fourth coupling groove  493  may be coupled to each other by a fastening member that may be inserted into and pass through the third coupling groove  413   a  and the fourth coupling groove  493 . The fastening member may be, for example, a bolt  493   a  or a pin. The fastening member such as the bolt  493   a  may be inserted into any one third coupling groove  413   a  of the rail coupling unit  410  and then inserted into the fourth coupling groove  493  formed at a side of the moving body  490  to couple the any one third coupling groove  413   a  and the fourth coupling groove  493  formed at the side of the moving body  490  to each other. The fastening member inserted into the third coupling groove  413   a  and the fourth coupling groove  493  may pass through the moving body  490 , pass through the fourth coupling groove  493  formed at another side of the moving body  490 , and pass through another third coupling groove  413   a  of the rail coupling unit  410  to couple the fourth coupling groove  493  formed at the other side of the moving body  490  and the other third coupling groove  413   a  to each other. When the fastening member is the bolt  493   a , screw valleys and screw peaks may be formed at one end of the bolt  493   a . In this case, a nut  493   c  may be coupled to the end of the bolt  493   a  to prevent the bolt  493   a  from freely deviating from the third coupling groove  413   a  and the fourth coupling groove  493  to stably couple the rail coupling unit  410  and the moving body  490  to each other. The reflecting module  400  may be mounted on or detached from the moving body  490  using the fastening member. The first coupling member may be rotated about the fastening member. 
         [0100]      FIG. 18  is a view for describing a fourth embodiment of the reflecting module and the moving body. 
         [0101]    As illustrated in  FIG. 18 , according to the fourth embodiment, the first coupling member of the reflecting module  400  may be a plurality of fifth coupling grooves  414   a  provided at a second coupling plate unit  414  of the rail coupling unit  410 , and the second coupling member of the moving body  490  may be a plurality of sixth coupling grooves  494  provided at an outer surface of the moving body  490  and respectively corresponding to the plurality of fifth coupling grooves  414   a . The fifth coupling grooves  414   a  may be formed at the flat plate  413   b  of the second coupling plate unit  414 . The fifth coupling grooves  414   a  and the sixth coupling grooves  494  may be coupled by a fastening member inserted into both of the fifth coupling grooves  414   a  and the sixth coupling grooves  494 . The fastening member is, for example, a bolt  494   a  or a pin. Referring to what is illustrated in  FIG. 18 , the fastening member such as the bolt  494   a  may be inserted into each of the fifth coupling grooves  414   a  and then inserted into each of the sixth coupling grooves  494  corresponding to each of the fifth coupling grooves  414   a  to couple each of the fifth coupling grooves  414   a  and each of the sixth coupling grooves  494  to each other. Screw peaks may be formed at an outer surface of the fastening member and screw valleys corresponding to the screw peaks of the fastening member may be formed at inner surfaces of the fifth coupling grooves  414   a  and the sixth coupling grooves  494  as needed to stably fix each of the fifth coupling grooves  414   a  and each of the sixth coupling grooves  494 . The reflecting module  400  may be mounted on or detached from the moving body  490  using the fastening member. As described above, the first coupling member may rotate about the fastening member. 
         [0102]      FIG. 19  is a view for describing a fifth embodiment of the reflecting module and the moving body. 
         [0103]    As illustrated in  FIG. 19 , according to the fifth embodiment, the first coupling member may be a third coupling protrusion unit  415 . The third coupling protrusion unit  415  may include a protrusion  415   b  protruding toward an inside or outside of the rail coupling unit  410  from an elastic flat plate  415   a  and an elastic flat plate  415   a . The elastic flat plate  415   a  may be bent toward the inside or the outside of the rail coupling unit  410 . The bent elastic flat plate  415   a  may be restored to the original state by an elastic force. The third coupling protrusion unit  415  may be provided as a pair of units at the rail coupling unit  410 . According to the fifth embodiment, the second coupling member of the reflecting module holder  490   a  of the moving body  490  may be a seventh coupling groove  495 . The seventh coupling groove  495  may be provided corresponding to the protrusion  415   b  of the third coupling protrusion unit  415 . In other words, the seventh coupling groove  495  may be provided at a predetermined position of the reflecting module holder  490   a  so that the protrusion  415   b  may be inserted thereinto and may have a predetermined shape. The seventh coupling groove  495  may be provided as a pair of grooves corresponding to the third coupling protrusion unit  415 . A user may bend the elastic flat plate  415   a  of the third coupling protrusion unit  415  toward the outside or the inside of the rail coupling unit  410  and then insert the protrusion  415   b  into the seventh coupling groove  495  to couple the rail coupling unit  410  and the reflecting module holder  490   a  to each other. In this case, the protrusion  415   b  and the seventh coupling groove  495  may remain stably coupled to each other by the elastic force of the elastic flat plate  415   a . As a result, the reflecting module  400  may be mounted on or detached from the moving body  490 . The first coupling member may rotate about the protrusion  415   b.    
         [0104]    Hereinafter, an operation of the reflecting module will be described with reference to  FIGS. 20 to 24 .  FIGS. 20 to 22  are views for describing an operation of the reflecting module, and  FIGS. 23 and 24  are views for describing a process of reflecting wash water by the reflecting module. As described above, when the fixed spray nozzle assemblies  330  and  340  of the dishwasher  1  spray wash water, the sprayed wash water may be reflected toward dishes by the reflecting module  400 . Consequently, the reflecting module  400  may be disposed at a position at which the wash water sprayed from the fixed spray nozzle assemblies  330  and  340  may be reflected. When the fixed spray nozzle assemblies  330  and  340  substantially horizontally spray wash water, the reflecting module  400  may be disposed substantially horizontal to fixed spray nozzle assemblies  330  and  340 . 
         [0105]    According to  FIGS. 20 to 22 , the bottom plate cover  600  may include the rotation guide  610  that protrudes to guide movement of the reflecting module  400 . Meanwhile, as described above, the reflecting module  400  may include the rotation locking part  409  to interfere with the rotation guide  610 . The rotation locking part  409  forms a rotation shaft of the reflecting module  400  while being formed above the coupling protrusion unit  491  of the reflecting module holder  490   a  that transmits the driving force to the reflecting module  400 . The rotation guide  610  may include a guide surface  611  formed as a curved surface to come into contact with the rotation locking part  409  and allow the reflecting module  400  to smoothly rotate. As illustrated in  FIG. 21 , when the reflecting module  400  reaches the rotation locking part  409  while moving toward the fixed spray nozzle assemblies  300  and  340  along the rail  440 , the rotation locking part  409  of the reflecting module  400  may interfere with the guide surface  611  of the rotation guide  610 . When the first coupling member is the first coupling groove  411  and the second coupling member is the first coupling protrusion unit  491  as illustrated in  FIGS. 13 to 15 , the reflecting module  400  may rotate about the first coupling protrusion unit  491  as illustrated in  FIG. 22 . Consequently, as illustrated in  FIGS. 23 and 24 , a direction in which the wash water reflected by the reflecting module  400  moves when the reflecting module  400  is disposed at a section away from the fixed spray nozzle assemblies  330  and  340  and a direction in which the wash water reflected by the reflecting module  400  moves when the reflecting module  400  is disposed at a section near the fixed spray nozzle assemblies  330  and  340  may be different from each other. 
         [0106]    Hereinafter, a flow channel structure will be described with reference to  FIG. 25 .  FIG. 25  is a view illustrating a flow channel structure of the dishwasher. Referring to what is illustrated in  FIGS. 3 and 25 , the wash tub  30  may include the sump  100  that retains wash water, the circulation pump  51  that pumps the wash water in the sump  100  to supply the wash water to the nozzle assembly  300 , and a drainage pump  52  that discharges the wash water in the sump  100  to the outside of the main body  10  together with scraps. A circulation pipe  51   a  that is a passage of wash water moving to the circulation pump  51  and a drainage hole  52   a  for discharging the wash water and scraps to the outside may be provided in the sump  100 . The circulation pump  51  may be connected to a distribution device  200  that distributes wash water to each of the nozzle assemblies  311 ,  313 ,  330 , and  340  of the nozzle assembly  300 . The distribution device  200  may be connected to the nozzle assembly  300  via a hose to distribute the wash water to each of the nozzle assemblies  311 ,  313 ,  330 , and  340 . Meanwhile, each of the nozzle assemblies  311 ,  313 ,  330 , and  340  may spray the wash water onto dishes or the reflecting module  400 . The wash water used in washing dishes may move to a lower end of the wash tub  30  and be stored in the sump  100 . 
         [0107]    Hereinafter, a washing process of the dishwasher  1  will be described. The dishwasher  1  may wash dishes according to a water supply process, a washing process, a draining process, and a drying process. The water supply process refers to a process in which wash water is supplied into the wash tub  30  through a water supply pipe (not shown). The wash water supplied into the wash tub  30  may flow into the sump  100  provided at the lower portion of the wash tub  30  by a gradient of the bottom plate  35  of the wash tub  30  and be stored in the sump  100 . The washing process refers to a process of performing dish washing. In the washing process, the circulation pump  51  may be operated to pump the wash water in the sump  100 , and the pumped wash water may be distributed to each of the nozzle assemblies  311 ,  313 , and  320  of the nozzle assembly  300 . The wash water pumped by the circulation pump  51  in the washing process may be distributed to at least one of the rotary nozzles  311  and  313 , the left fixed nozzle  330 , and the right fixed nozzle  340  by the distribution device  200 . According to an embodiment, the left fixed nozzle  330  may receive the wash water from the distribution device  200  through a first hose  271   a , and the upper rotary nozzle assembly  311  and the middle rotary nozzle assembly  313  may receive the wash water from the distribution device  200  through a second hose  271   b . The wash water may be sprayed with high pressure by each of the nozzle assemblies  311 ,  313 ,  330 , and  340  by a pumping force of the circulation pump  51 . The sprayed wash water may directly reach dishes or may reach the dishes after being reflected by the reflecting module  400  to wash the dishes. The wash water sprayed by the nozzle assemblies  311 ,  313 ,  330 , and  340  may strike the dishes to remove scraps on the dishes and may fall together with the scraps to be stored in the sump  100  again. The circulation pump  51  may pump the wash water stored in the sump  100  again to circulate the wash water within the flow channel structure of the dishwasher to repeat the process described above. During the washing process, the circulation pump  51  may repeat being operated and stopped at least once. The operation and stoppage of the circulation pump  51  may be performed based on a predefined pattern. The predefined pattern may be defined by a user or may be defined by a designer of the apparatus. The scraps that have fallen into the sump  100  together with the wash water in the washing process may be collected by a filter mounted on the sump  100 . Consequently, the scraps remain in the sump  100  without being circulated. The draining process refers to a process of draining the scraps remaining in the sump  100  to the outside of the main body  10 . The draining process may be performed according to an operation of the drainage pump  52 . During the draining process, the wash water may be drained to the outside together with the scraps. The drying process refers to a process of drying washed dishes. The drying process may be performed by operating a heater (not shown) mounted on the wash tub  30 . 
         [0108]      FIG. 26  is a structural view of a dishwasher for describing a process of controlling the dishwasher. According to  FIG. 26 , the dishwasher  1  may include the user interface  20 , a control unit  700 , a spray driving unit  710 , a moving body driving unit  720 , the spray nozzles  311 ,  313 , and  320 , the moving body  490 , and the reflecting module  400 . 
         [0109]    The user interface  20  may be provided at the outer surface of the main body  10  as described above. The user interface  20  may include the input unit  20   a  or the display unit  20   b  as described above.  FIG. 27  is a view illustrating an embodiment of a user interface of the dishwasher. As illustrated in  FIG. 27 , according to an embodiment, the user interface  20  may include a plurality of buttons  21  to  25  and  27  to receive an instruction from the user. The plurality of buttons  21  to  25  and  27  may include a power button  21  to operate the dishwasher  1 , a washing method selection button  22  to select a dish washing method, a cleaning mode selection button  23  to operate the dishwasher  1  in the cleaning mode, a washing position selection button  24  to select a position for washing, an option button  25  to select various types of settings, and a washing start button  27  to instruct the dishwasher  1  to start the washing operation. In addition, the user interface  20  may include a display unit  26  to display washing time, remaining washing time, a current operation mode, or various types of errors. 
         [0110]    The control unit  700  may control an operation of the dishwasher  1  according to a user&#39;s instruction input through the input unit  20   a  of the user interface  20  or predefined settings. According to an embodiment, the control unit  700  may determine at least one control mode among a plurality of control modes for controlling the dishwasher and may also control the operation of the dishwasher  1  according to the determined control mode. In this case, the plurality of control modes may include a dish washing mode, an operation standby mode, and a cleaning mode. The dish washing mode is a mode for performing an operation of washing dishes. In the case of the dish washing mode, the control unit  700  may transmit a control command to the spray driving unit  710  or the moving body driving unit  720  to allow dishes to be washed. The operation standby mode is a mode for waiting to prepare dish washing or receive a new instruction and the like. In the case of the operation standby mode, the control unit  700  may cut off power applied to various types of parts or devices that are not operating to minimize standby power. The cleaning mode is a mode for performing various types of operations for washing the inside of the wash tub  30  or cleaning the reflecting module  400 . In addition, the control unit  700  may generate various control commands other than the above to control an overall operation of the dishwasher  1 . For example, the control unit  700  may control the door  11  not to open during the dish washing mode and may control the door  11  to open during the cleaning mode. 
         [0111]    The control unit  700  may be implemented with a semiconductor chip and a printed circuit board on which the semiconductor chip may be installed. The semiconductor chip may perform at least one of controlling, computing, and storing functions. The semiconductor chip and the printed circuit board may be installed at any place of the dishwasher  1  according to the designer&#39;s choice. For example, the semiconductor chip and the printed circuit board may be installed inside a housing that forms the door  11  of the dishwasher  1  or may be installed at an upper portion or lower portion of the main body  10  of the dishwasher  1 . 
         [0112]    The spray driving unit  710  may generate a driving force to allow the wash water to be sprayed by the nozzles  311 ,  313 ,  330 , and  340  according to a control command of the control unit  700 . According to an embodiment, the spray driving unit  710  may include the circulation pump  51  and the drainage pump  52 . 
         [0113]    The moving body driving unit  720  may generate a driving force that moves the moving body  490  to which the reflecting module  400  is coupled in a predetermined direction to allow the reflecting module  400  to move inside the wash tub  30 . The moving body driving unit  720  may include the motor  530  connected to the drive pulley  500 . According to an embodiment, the moving body driving unit  720  may also include a pneumatic actuator or a hydraulic actuator. 
         [0114]      FIG. 28  is a flowchart of an embodiment of a method for controlling a dishwasher. According to an embodiment of a method for controlling the dishwasher  1 , first, the dishwasher  1  may operate in an operation standby mode (S 10 ). Of course, according to an embodiment, the dishwasher  1  may not always have to operate in the operation standby mode.  FIGS. 29 and 30  are views for describing an operation of the dishwasher in an operation standby mode. As illustrated in  FIGS. 28 and 29 , when a user manipulates the power button  21  of the dishwasher  1 , power is applied to the dishwasher  1 , and the control unit  700  may generate a control command related to an operation standby mode. Then, the dishwasher  1  may operate in the operation standby mode for preparing dish washing. In the operation standby mode, the dishwasher  1  may wait until the user&#39;s instruction is input through the input unit  20   a  and the like. According to  FIG. 30 , a position of the reflecting module  400  inside the wash tub  30  may be initialized in the operation standby mode. In other words, the reflecting module  400  may move to an initial position provided near the fixed spray nozzle assembly  320  from a random position  400   a  (a). 
         [0115]      FIGS. 31 to 33  are views for describing an operation of the reflecting module in a dish washing mode. When the user manipulates at least one of the washing method selection button  22  and the washing start button  27  as illustrated in  FIG. 31  and the dish washing mode is selected (S 20 ), the control unit  700  may generate a control command according to the dish washing mode and may transmit the control command to the spray driving unit  710  and the moving body driving unit  720  to perform dish washing (S 21 ). In the dish washing mode, the reflecting module  400  may reflect the wash water sprayed by the fixed nozzles while moving in an opposite direction (b) of the fixed nozzle assembly  320  or in a direction (c) toward the fixed nozzle assembly  320  together with the moving body  490  that moves by the motor  530  and the belt  520  (S 22 ). 
         [0116]    When the dish washing is finished, an operation of the spray driving unit  710 , e.g. the circulation pump  51 , ends and each of the nozzles  311 ,  313 ,  330 , and  340  of the nozzle assembly  300  no longer sprays the wash water (S 23 ). Furthermore, an operation of the moving body driving unit  720 , e.g. the motor  530 , also ends and the moving body  490  and the reflecting module  400  coupled to the moving body  490  may also not operate. According to an embodiment, the reflecting module  400  may move to the initial position (a) as illustrated in  FIG. 30  after the dish washing is finished ( 40 ). 
         [0117]      FIGS. 34 to 39  are views for describing a process of cleaning the reflecting module in a cleaning mode. When the user manipulates the cleaning mode selection button  23  as illustrated in  FIG. 34  and the cleaning mode is selected (S 30 ), the control unit  700  may generate a control command according to the cleaning mode and transmit the control command to the moving body driving unit  720 . According to an embodiment, the control unit  700  may also generate a control command related to whether the door  11  is openable and closable. According to  FIG. 35 , in the cleaning mode, the reflecting module  400  may move in a direction in which the opening  11   a  is formed inside the wash tub  30  (S 31 ). When the fixed nozzle assembly  320  is formed at the rear wall  32  that faces the opening  11   a  inside the wash tub  30 , the reflecting module  400  may move in the opposite direction of a direction in which the fixed nozzle assembly  320  is installed (d). According to  FIG. 36 , the reflecting module  400  that has been moving toward the opening  11   a  may stop near the opening (e). In this way, movement and stoppage of the reflecting module  400  may be performed by operating the moving body driving unit  720  based on the control command of the control unit  700 . 
         [0118]    According to an embodiment, when the reflecting module  400  is stopped as illustrated in  FIG. 37 , the door  11  may be openable (S 32 ). In other words, safety may be improved since the user can open the door  11  of the dishwasher  1  after the movement of the reflecting module  400  is finished to detach the reflecting module  400  from the moving body  490 . Whether the door  11  is openable and closable may be determined according to a control signal transmitted from the control unit  700 . Of course, step (S 32 ) may also be omitted. 
         [0119]    After the door  11  is open, the user may separate the first coupling member of the reflecting module  400  and the second coupling member of the moving body  490  from each other to detach the reflecting module  400  from the moving body  490 . For example, as illustrated in  FIG. 38 , the user may separate the reflecting module  400  and the moving body  490  from each other by deviating the first coupling groove  411  of the reflecting module  400  from the first coupling protrusion unit  491  of the moving body  490  (S 33 ). 
         [0120]    When the reflecting module  400  is separated, the user may wash and clean the reflecting module  400  using water and the like as illustrated in  FIG. 39  (S 34 ). When the cleaning of the reflecting module  400  is finished, the user may again couple the reflecting module  400  to the moving body  490  using the first coupling member of the reflecting module  400  and the second coupling member of the moving body  490  (S 35 ). According to an embodiment, when the reflecting module  400  is coupled again to the moving body  490 , a separate sensor (not shown) may detect whether the reflecting module  400  and the moving body  490  are coupled to each other. When the coupling between the reflecting module  400  and the moving body  490  is detected, the control unit  700  may generate a control command for moving the reflecting module  400  to the initial position as illustrated in  FIG. 30  as needed, and the reflecting module  400  may move to the initial position (a) (S 24 ). 
         [0121]    The dishwasher and the method for controlling the same are industrially applicable due to being able to be used in households or industrial sites for washing dishes and the like.