Patent Publication Number: US-2022218117-A1

Title: Mattress care device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Korean Patent Application No. 10-2021-0005136, filed on Jan. 14, 2021 in the Republic of Korea, which is hereby incorporated by reference in its entirety for all purposes as if fully set forth herein. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present disclosure relates to a new type mattress care device that is provided at a bed to easily care for a mattress. 
     2. Description of the Background Art 
     In general, a mattress is laid and used on a floor, a bed, etc., as a support for bedclothes (e.g., bedding, bedcovers, etc.). 
     When a mattress is used for a bed, users place the mattress on a bed frame and additionally lay or put on bedclothes on the mattress to sleep. 
     Such a mattress for a bed is most always installed on a bed frame, so it is required to continuously care for the mattress for cleanliness. 
     In the related art, mattresses are cared for through periodic washing of the mattress cover, cleaning of shaking dust off the surface of the mattresses, or using of a cleaner for bedclothes. 
     In particular, recently, according to Korean Utility Model No. 20-0388045, Korean Patent Application Publication No. 2009-0111632, Korean Patent No. 10-1767055, Korean Patent No. 10-1853624, Korean Patent Application Publication No, 10-2020-0067464, etc., a sterilizer having a UV-C lamp on the bottom is installed over a mattress to be movable in the front-rear direction (in the longitudinal direction of a bed) so that the mattress can be sterilized and cleaned. 
     However, according to the related art, when both sides of the sterilizer that is moved in the front-rear direction of the mattress are not moved at the same speed, the two sides may be twisted due to the speed difference therebetween. That is, there is a problem of poor movement such as that any one side is caught in a side of the bed frame due to twist of both sides of the sterilizer. 
     Further, according to the related art, there is difficulty in manufacturing because the length of the UV-C lamp should correspond to the left-right width of the mattress to sufficiently radiate UV-C to the entire mattress, so the manufacturing cost is also unavoidably high. 
     Further, even though the sterilizer (e.g., bed cleaner) has a suction part, a sufficient suction ability is not provided because the suction part is formed to have a length corresponding to the width of the mattress, so there is a problem that the cleaning ability is remarkably decreased. 
     DOCUMENTS OF RELATED ART 
     
         
         (Patent Document 1) Korean Utility Model No. 20-0388045. 
         (Patent Document 2) Korean Patent Application Publication No. 10-2009-0111632. 
         (Patent Document 3) Korean Patent No. 10-1767055. 
         (Patent Document 4) Korean Patent No. 10-1853624. 
         (Patent Document 5) Korean Patent Application Publication No. 10-2020-0067464. 
       
    
     SUMMARY OF THE INVENTION 
     The present disclosure has been made in an effort to solve various problems of the related art described above and an objective of the present disclosure is to provide a new type mattress care device that can automatically sterilize and vacuum-clean a mattress and can provide a high suction force. 
     Another objective of the present disclosure is to provide a new type mattress care device that can prevent restriction of movement due to inclination even if there is a speed difference between the left and right sides when the mattress care device is moved. 
     Another objective of the present disclosure is to provide a new type mattress care device that can achieve a sufficient sterilization effect, while making it possible to minimize the size of a UV-C lamp or the number of UV-C lamps. 
     According to a mattress care device of the present disclosure for achieving the objectives, both side frames of a moving module may be installed to be rotatable with respect to a top frame. 
     According to the mattress care device of the present disclosure, the moving module may be configured to move in the front-rear direction of a mattress and a cleaning module may be configured to move in the width direction of the mattress. 
     According to the mattress care device of the present disclosure, connection portions between two side frames of the moving module and the top frame are configured to be rotatable, so poor movement may be prevented even though the movement speeds of the two side frames are not the same. 
     According to the mattress care device of the present disclosure, since the outer surface of side walls of a bed frame has a vertical surface and an inclined surface, it is possible to prevent dirt, such as dust from being caught or collected in a gap between the bottom of the top frame and the top of the mattress. 
     According to the mattress care device of the present disclosure, side accommodation grooves in which side frames are accommodated are formed on the top of the rear end of the bed frame, so the side frames can be kept in close contact with the bed frame when cleaning is not performed. 
     According to the mattress care device of the present disclosure, a storage groove is formed on the top of the rear end of the bed frame, so the top frame of the moving module can be placed and kept therein when cleaning is not performed. 
     According to the mattress care device of the present disclosure, the storage groove may be recessed by the thickness of the top frame. 
     According to the mattress care device of the present disclosure, a cleaning accommodation groove is recessed in the storage groove, so the cleaning module can be kept without being exposed to the outside. 
     According to the mattress care device of the present disclosure, a communication hole that communicates with the inside of a cleaner accommodation groove is formed at (e.g., in) the bed frames, so a dirt collection envelope can be replaced even with the cleaning module stored. 
     According to the mattress care device of the present disclosure, the side frame may be moved by at least one moving wheel that is operated by a wheel-driving motor. 
     According to the mattress care device of the present disclosure, bending ends bent to face each other are formed at the upper ends of the two side frames, and both ends of the top frame are placed on and hinged to the tops of the bending ends, respectively. Accordingly, poor movement can be prevented even if the movement speeds of the two side frames are not the same. 
     According to the mattress care device of the present disclosure, a seat groove is recessed on the bottoms of both ends of the top frame and the bending ends may be seated in the seat grooves. 
     According to the mattress care device of the present disclosure, a protrusion that protrudes downward to face the outer surface of the side wall of the bed frame is formed at the lower ends of the two side frames. 
     According to the mattress care device of the present disclosure, a rolling member may be disposed in the inner surface of the protrusion. 
     According to the mattress care device of the present disclosure, a plurality of rolling members may be provided and installed in the inner surface of the protrusion sequentially in a movement direction of the moving module. 
     According to the mattress care device of the present disclosure, the cleaning module may be formed smaller than the left-right width of the mattress and may be movably installed on the bottom of the top frame. Accordingly, it is possible to improve a suction force even with the same output and to reduce the number of UV-C LEDs. 
     According to the mattress care device of the present disclosure, a rack gear may be longitudinally formed on the bottom of the top frame and a movement motor having a pinion gear may be disposed at the cleaning module. Accordingly, the cleaning module can be electronically controlled to move along the top frame. 
     According to the mattress care device of the present disclosure, a guide rail and a guide groove are formed on the surfaces facing each other between the top frame and the cleaning module, respectively, whereby movement of the cleaning module can be guided. 
     According to the mattress care device of the present disclosure, the cleaning module may include a suction unit that collects dirt by providing a suction force, whereby it is possible to remove dirt on the surface of the mattress. 
     According to the mattress care device of the present disclosure, the cleaning module includes a UV-C emitter that emits ultra-violet-C (UV-C), thereby being able to sterilize the surface of the mattress. 
     According to the mattress care device of the present disclosure, when the UV-C emitter emits light to emit UV-C, a controller controls the movement speed of the cleaning module to be lower than the movement speed when the UV-C emitter does not emit light, whereby it is possible to improve sterilization effect. 
     According to the mattress care device of the present disclosure, when the UV-C emitter emits light to emit UV-C, a controller controls the movement speed of the moving module to be lower than the movement speed when the UV-C emitter does not emit light, whereby it is possible to improve sterilization effect. 
     As described above, according to the mattress care device of the present disclosure, since the two side frames are rotatably connected to the top frame of the moving module, the two side frames can be accurately moved in the longitudinal direction of the bed frame without twisting even though a speed difference is generated between the two side frames when the moving module is moved forward and backward. 
     According to the mattress care device of the present disclosure, since the outer surface of the side walls of the bed frame has a vertical surface and an inclined surface, it is possible to prevent dirt from being caught in the portion where the moving module is rolled. 
     According to the mattress care device of the present disclosure, since the storage groove and the side accommodation grooves are formed on the top of the bed frame, the moving module can be kept not to be visually seen when the moving module is not used. 
     According to the mattress care device of the present disclosure, since the cleaner accommodation groove is formed in the storage groove, the cleaning module can be kept not to be exposed. 
     According to the mattress care device of the present disclosure, since a moving wheel that is operated by a wheel-driving motor is disposed on the bottoms of the side frames, the movement speed of the moving module can be controlled. 
     According to the mattress care device of the present disclosure, since the two side frames and the top frame are coupled through hinges, the top frame can be easily rotated on the hinges (i.e., by the hinges) with respect to the two side frames. 
     According to the mattress care device of the present disclosure, since a protrusion is formed at the two side frames, poor movement that may be caused by getting caught due to rotation of the two side frames can be prevented. 
     According to the mattress care device of the present disclosure, since the moving module is formed larger than the left-right width of the mattress and the cleaning module is formed smaller than the left-right width of the mattress, there is an effect that it is possible to achieve sufficient sterilization and dirt collection, even if UV lamps are minimally provided and a suction force is minimally provided. 
     According to the mattress care device of the present disclosure, since the cleaning module can be moved from the top frame using a rack gear and a pinion gear, the movement speed of the cleaning module can be controlled. 
     According to the mattress care device of the present disclosure, since the cleaning module includes the UV-C emitter, there is an effect that it is possible to sterilize the mattress by emitting UV-C. 
     According to the mattress care device of the present disclosure, since when cleaning is performed while UV-C is emitted, only the suction unit is operated and the movement speed is controlled to be lower than that when cleaning is performed, there is an effect that it is possible to sufficiently emit UV-C and achieve a sufficient sterilization effect. 
     Further scope of applicability of the invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration only, since various changes and modifications within the scope of the invention will become apparent to those skilled in the art from this detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention. 
         FIG. 1  is a perspective view showing an installation state of a mattress care device according to an embodiment of the present invention. 
         FIG. 2  is a side view showing the installation state of the mattress care device according to an embodiment of the present invention. 
         FIG. 3  is a front view showing the installation state of the mattress care device according to an embodiment of the present invention. 
         FIG. 4  is a plan view showing the installation state of the mattress care device according to an embodiment of the present invention. 
         FIG. 5  is a perspective view illustrating the internal structure of a moving module of the mattress care device according to an embodiment of the present invention. 
         FIG. 6  is an enlarged view of the part “A” in  FIG. 3  for illustrating the operation structure of the moving module of the mattress care device according to an embodiment of the present invention. 
         FIG. 7  is a perspective bottom view showing main parts to illustrate the operation structure of the moving module of the mattress care device according to an embodiment of the present invention. 
         FIG. 8  is a plan view showing the state in which two side frames of the moving module of the mattress care device according to an embodiment of the present invention are formed not to rotate with respect to a top frame. 
         FIG. 9  is an enlarged view of the part B of  FIG. 8 . 
         FIG. 10  is a cut perspective view showing main parts to illustrate a structure in which a cleaning module is installed at the moving module of the mattress care device according to an embodiment of the present invention. 
         FIG. 11  is a side cross-sectional view schematically showing the internal structure of the cleaning module of the mattress care device according to an embodiment of the present invention. 
         FIG. 12  is a front cross-sectional view schematically showing the internal structure of the cleaning module of the mattress care device according to an embodiment of the present invention. 
         FIG. 13  is a block diagram schematically illustrating a control structure by a controller of the mattress care device according to an embodiment of the present invention. 
         FIG. 14  is a perspective view illustrating a stowing state when the mattress care device according to an embodiment of the present invention is not operated. 
         FIG. 15  is a side view showing the stowing state when the mattress care device according to an embodiment of the present invention is not operated. 
         FIG. 16  is a plan view showing the stowing state when the mattress care device according to an embodiment of the present invention is not operated. 
         FIG. 17  is a perspective view showing the state in which the moving module is separated from a storage part when the mattress care device according to an embodiment of the present invention is operated. 
         FIG. 18  is a perspective view showing the state in which the moving module is separated from a storage part when the mattress care device according to an embodiment of the present invention is operated from at a different position than  FIG. 17 . 
         FIG. 19  is a side view showing the state in which the moving module is separated from the moving module housing when the mattress care device according to an embodiment of the present invention is operated. 
         FIG. 20  is a perspective view showing the operation state of the moving module and the cleaning module when the mattress care device according to an embodiment of the present invention is operated. 
         FIG. 21  is a plan view illustrating operation routes of the moving module and the cleaning module of the mattress care device according to an embodiment of the present invention. 
         FIG. 22  is a plan view showing the state of the moving module when a speed difference is generated between two moving wheels when the mattress care device according to an embodiment of the present invention is operated. 
         FIG. 23  is an enlarged view of the part “C” of  FIG. 22 . 
         FIG. 24  is a cross-sectional view illustrating a cleaning module of a mattress care device according to an embodiment of the present invention. 
         FIG. 25  is a view showing the states of main parts to illustrate a movement structure between a bed frame and a moving module of a mattress care device according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention will now be described with reference to the accompanying drawings, wherein the same reference numerals have been used to identify the same or similar elements throughout the several views. 
     Hereafter, a mattress care device according to an embodiment of the present disclosure is described with reference to  FIGS. 1 to 25 . 
       FIG. 1  is a perspective view showing an installation state of a mattress care device according to an embodiment of the present disclosure,  FIG. 2  is a side view showing the installation state of the mattress care device according to an embodiment of the present disclosure,  FIG. 3  is a front view showing the installation state of the mattress care device according to an embodiment of the present disclosure, and  FIG. 4  is a plan view showing the installation state of the mattress care device according to an embodiment of the present disclosure. 
     As shown in the figures, a mattress care device according to an embodiment of the present disclosure is configured to prevent poor movement by attenuating twist of both side frames  210  of a moving module  200 , which is moved in the front-rear direction of a mattress  10 , due to a speed difference even if the side frames  210  are not moved at the same speed. 
     The mattress care device according to an embodiment of the present disclosure is described hereafter. 
     First, the mattress care device according to an embodiment of the present disclosure may include a bed frame  100 . 
     The bed frame  100  is a part that forms the external appearance of a bed. 
     The bed frame  100  may be formed in a box shape that has two side walls  120  forming both sides and is open upward. 
     A vertical surface  121  and an inclined surface  122  are formed on each of the outer surfaces (e.g., surfaces exposed to the outside) of the two side walls  120 . The vertical surface  121  is vertically formed from the top of the side wall  120  and the inclined surface  122  extends from the bottom of the vertical surface  121  to be inclined outward as it extends downward. 
     The structure of the vertical surfaces  121  and the inclined surfaces  122  are determined such that a stepped portion on which dust collects is not formed at the portions exposed to the outside of the bed frame  100 . In particular, the structure of the vertical surfaces  121  and the inclined surfaces  122  can prevent the problem that dirt is caught between surfaces facing each other between the outer surfaces and the moving module  200 , which is described below. 
     Next, the mattress care device according to an embodiment of the present disclosure includes the moving module  200 . 
     The moving module  200  is a structure installed to be able to move in the front-rear direction of the bed frame  100  (e.g., between the head side to the foot side of the mattress, in the longitudinal direction of the bed frame  100 ). 
     As shown in  FIG. 5 , the moving module  200  may include two side frames  210  and a top frame  220 . That is, the top frame  220  of the moving module  200  is disposed across the top of the mattress  10  and can be moved in the longitudinal direction of the mattress  10 . The side frames  210  may extend in a downward direction from the top frame  220  (e.g., from opposing first and second ends of the top frame  220 ), and the top frame  220  may be substantially planar. 
     The side frames  210  are parts forming both sides of the moving module  200 . 
     The side frames  210  are placed on the tops (i.e., top surfaces) of the two side walls  120  of the bed frame  100  to be moved in the front-rear direction of the mattress  10  (e.g., to be moved with respect to the bed frame  100 ). 
     In particular, the upper ends of the side frames  210  are positioned higher than the mattress  10  and vertically erect (i.e., extend in a vertical direction). 
     A bending end  211  is formed at the upper end of the side frame  210 . The bending ends  211  are bent to face each other between the two side frames  210  and are provided as portions coupled to the top frame  220 . This configuration is shown in  FIGS. 3 and 5 . Further, each bending end  211  is connected to a respective seat groove  221  of the top plate  220 , which is discussed below. 
     At least one rollable moving wheel  212  is installed at the bottom of each of the side frames  210 . The rollable moving wheel  212  is rotated by a wheel-driving motor  213  such that the corresponding side frame  210  is moved forward or backward (i.e., along a longitudinal direction of the bed frame  100 ). 
     The rollable moving wheel  212  may be fitted on a shaft of the wheel-driving motor  213  or may be connected to the wheel-driving motor  213  through a chain, a belt, a gear, or the like, as known in the art, to be able to transmit power (e.g., rotational force) from the wheel-driving motor  213  to the rollable moving wheel  212 , to drive the rollable moving wheel  212 . This configuration is shown in  FIG. 6 . 
     As shown in  FIGS. 6 and 7 , protrusions  214  that protrude downward further than the top of the two side walls  120  of the bed frame  100  are formed at the lower ends of the two side frames  210 , respectively. The protrusions  214  support outer surfaces of the side walls  120  and prevent the two side frames  210  from be separated from the side walls  120 . 
     In particular, a rolling member  215  that rolls in contact with the outer surface of the side wall  120  of the bed frame  100  may be disposed on the inner surface (i.e., the surface facing the side wall  120 ) of the protrusion  214 . 
     The rolling members  215  prevent the moving module  200  from being restricted when the moving module  200  comes in contact with the side walls  120  due to twist (inclining clockwise or counterclockwise when seen from above) that is generated by a speed difference between the two side frames  210 . 
     That is, since the two side frames  210  are operated by wheel-driving motors  213 , respectively, a rolling speed difference is unavoidably generated between the rollable moving wheels  212 . In this case, since the rolling members  215  are rolled in contact with the side walls  120 , the moving module  200  is prevented from being restricted in the bed frame  100  (i.e., the movement of the moving module  200  with respect to the bed frame is prevented from being restricted/limited). 
     A plurality of rolling members  215  may be provided. In this case, the rolling members  215  may be disposed on the inner surface of the protrusion  214  sequentially in the movement direction of the moving module  200 . 
     In detail, the rolling member  215  may be disposed at both sides of the inner surface of the protrusion  214 . Accordingly, it is possible to prevent the moving module  100  from being restricted (i.e., in movement) regardless of the twist direction. 
     The top frame  220  is a part forming the top of the moving module  200 . 
     Both ends (i.e., opposing first and second ends) of the top frame  220  are connected to the upper ends of the two side frames  210 , respectively, and are disposed over the mattress  10  in a width direction of the mattress  10  (i.e., in a horizontal direction perpendicular to the longitudinal direction of the bed frame  100 ). 
     In particular, the length of the top frame  220  may be larger than the left-to-right width of the mattress  10 . 
     The gap between the bottom of the top frame  220  and the top of the mattress  10  may be designed in consideration of the height of a cleaning module  300 , which is described below. Of course, the two side frames  210  are configured such that their heights can be adjusted (for example, in a telescopic structure), whereby they may be used in common regardless of the thickness of the mattress  10 . 
     Both ends of the top frame  220  are placed on the tops of the bending ends  211  formed at the upper ends of the two side frames  210 . In more detail, seat grooves  221  in which the bending ends  221  are inserted may be recessed on the bottoms of both ends of the top frame  220 . Each seat groove  221  may have a shape that corresponds to a shape of the respective bending end  211  to retain the bending end  211 . 
     The connection portions between the top frame  220  and the two side frames  210  may be fixed to each other. That is, the bending ends  211  and the seat grooves  221  may be attached to one another. Alternative, the top frame  220  and the two side frames  210  may be integrally formed. 
     However, if the connection portions between the top frame  220  and the two side frames  210  are fixed, when there is a difference between the rolling speeds of the moving wheels at the two side frames  210 , the moving module  200  twists while the side having a higher rolling speed moves faster. This configuration is shown in  FIGS. 8 and 9 . 
     In particular, when the moving module  200  twists, the side frame  210  of the faster side (i.e., the side moving first) obliquely comes in contact with the outer surface of the respective side wall  120  of the bed frame  100 . Further, when the moving module  200  continues to operate to move with respect to the bed frame  100 , the faster side frame  210  may be caught like a wedge (i.e., frictionally engage the respective side wall  120 ), to prevent further movement of the moving module  200 . 
     Considering this problem, an embodiment of the present disclosure proposes that the two side frames  210  are rotatably coupled to the top frame  220 . 
     That is, both ends of the top frame  220  and the bending ends  221  are coupled through hinges  230  so that the two side frames  210  can be rotated left and right (e.g., along a horizontal axis or horizontal direction) with respect to the top frame  220 . 
     Accordingly, even if the rolling speeds of the moving wheels  212  at the two side frames  210  becomes different and any one side frame  210  gradually comes in contact with the outer surface of the side wall  120  of the bed frame  100 , the side frame  210  is rotated as much as the contact force and the side frame  210  is not caught like a wedge (i.e., the side frames  210  can continue to move with respect to the bed frame  100 ). 
     This configuration is shown in  FIGS. 22 and 23 . That is, a side frame  210  is rotated as much as hitting of the side frame  210  against the outer surface of a side wall  120  of the bed frame  100 , whereby it is not restricted. 
     The hinge  230  connecting the top frame  220  and the bending end  211  may be integrally formed at at least any one of the top frame  220  and the bending end  211  and the hinge  230  may be coupled to be separable from both the top frame  220  and the bending end  211 . 
     At least one stop position checker  240 , that senses a position (e.g., of the moving module  200  in a movement direction may be disposed on at least any one of the surfaces facing each other between the moving module  200  and the bed frame  100 . That is, this is for preventing power consumption by enabling the moving module  200  to move accurately within the range in which the mattress  10  is positioned without excessive moving forward or backward. 
     The stop position checker  240  may be a common optical sensor or proximity sensor, may be an encoder that can be installed on the moving wheel  212 , or may be a switch that is installed on the surfaces facing each other between the moving module  200  and the bed frame  100 . 
     Of course, the stop position checker  240  may be a sensor including a light emitter and a light receiver and may be disposed on the surfaces facing each other between the side frames  210  and the bed frame  100 . 
     The stop position checker  240  may be configured to provide a sensing signal to a controller  400 . 
     The mattress care device of the present disclosure may include a storage part  140  on the bed frame  100 . 
     The storage part  140  is a part provided at the bed frame  100  to keep (i.e., store) the moving module  200  and the cleaning module  300  when they are not in use. 
     The storage part  140  may be provided at the rear end of the bed frame  100  (opposite to the headboard). That is, the moving module  200  and the cleaning module  300  can be kept at the foot side of the bed (e.g., within the foot side of the bed) to prevent users from feeling unpleasant and to be out of the way when not in use. 
     The storage part  140  may have a storage groove  141  in which the top frame  220  is accommodated and side accommodation grooves  142  in which the two side frames  210  are accommodated. 
     The storage groove  141  may be recessed from the top of the bed frame  100  and may accommodate the top frame  220 . The storage groove  141  may be recessed by the depth of the top frame  220 . 
     The side grooves  142  may be formed at both sides (i.e., opposing sides) of the storage groove  141 , respectively, on the top of the bed frame  100  and may be recessed by a depth at which the side frames  210  can be fully accommodated, respectively. 
     A cleaner accommodation groove  143  may be recessed in the storage groove  141 . The cleaner accommodation groove  143  is a part for accommodating the cleaning module  300 , so the cleaning module  300  can be accommodated and kept therein. 
     In particular, a communicating hole  145  that communicates with the inside of the cleaner accommodation groove  143  and is opened and closed by a door  144  may be formed through a rear wall of the storage part  140  of the bed frame  100 . 
     That is, a user can empty or replace a dirt collection tub (or dirt collection envelope)  322  in the cleaning module  300  through the communicating hole  145 . Of course, an outlet hole for taking out the dirt collection tub  322  may be formed through a rear wall of the cleaning module  300 . 
     Next, the mattress care device according to an embodiment of the present disclosure may include a cleaning module  300 . 
     The cleaning module  300  is a device for cleaning the mattress  10 . 
     The cleaning module  300  is installed on a bottom of the top frame  220  of the moving module  200 , is formed smaller than the left-right width (i.e., in the horizontal direction) of the mattress  10 , and is configured to move in the longitudinal direction of the top frame  220  (width direction of the mattress and horizontal direction/axis). 
     That is, the moving module  200  can be moved forward and backward with respect to the mattress  10  and the cleaning module  300  can be moved left and right with respect to the mattress  10 . 
     Accordingly, even though the left-right width of the cleaning module  300  is smaller than the left-right width of the mattress  10 , it is possible to clean all of the left and right sides of the mattress  10  and clean all of the front and rear portions of the mattress  10  in cooperation with the moving module  200 . 
     A guide rail  222  and the guide groove  301  may be formed to correspond to each other on the bottom of the top frame  220  and the top of the cleaning module  300 , respectively. The guide rail  222  may have a substantially triangular shape. That is, the guide rail  222  and the guide groove  301  may be fitted to each other, whereby the cleaning module  300  can be moved to desired positions under the top frame  220 . This configuration is shown in  FIGS. 10 and 11 . 
     In an embodiment of the present disclosure, it is exemplified that the guide rail  222  protrudes from the bottom of the top frame  220  and the guide groove  301  is recessed from the top of the cleaning module  300 . 
     In particular, the guide rail  222  may be formed along the center line of the bottom of the top frame  220 , and the guide rail  222  and the guide groove  301  may be formed such that both sides are gradually inclined outward as they go down. Accordingly, the cleaning module  300  can be hung on the bottom of the top frame  220  (i.e., the cleaning module  300  can be fully supported to the bottom of the top frame  220  by the connection between the guide groove  301  and the guide rail  222 ). 
     The cleaning module  300  may include a moving unit  310 . 
     That is, a moving unit  310  that is controlled by the controller  400  is provided, whereby the cleaning module  300  can be automatically moved in the longitudinal direction of the top frame  220 . 
     The moving unit  310  may include a movement motor  313  having a rack gear  311  and a pinion gear  312 . 
     That is, the cleaning module  300  includes the moving unit  310 , whereby the cleaning module  300  can be controlled by the controller  400  to automatically move in the longitudinal direction of the top frame  220 . 
     The rack gear  311  may be formed on the bottom of the top frame  220  (e.g. in the center of the guide rail  222 ) and the pinion gear  312  may be installed/positioned on the top of the cleaning module  300  (e.g., a top exposed surface of the cleaning module  300 , including within the guide groove  301 ) to be partially exposed. The rack gear  311  may extend along a longitudinal direction of the top frame  220 . The exposed portion of the pinion gear  312  is installed to engage with the rack gear  311  and the movement motor  313  may be coupled to the pinion gear  312  through a shaft and may be disposed in the cleaning module  300 . 
     Of course, the moving unit  310  may configured in a structure including a ball screw or an actuator in addition to the structure including the rack gear  311  and the pinion gear  312 . 
     An intake hole  302  is formed through the bottom of the cleaning module  300  and a discharge hole  304  is formed through any one side. A filter member  303  for filtering out particulate matter in the air that is discharged may be disposed in the discharge hole  304 . 
     A suction unit  320  may be disposed in the cleaning module  300 . 
     The suction unit  320  (i.e., vacuum) is provided to suction and remove dirt on the top of the bed  10  by providing a suction force, and may include a fan motor  321  disposed in the cleaning module  300  and a dirt collection tub  322  in which dirt suctioned through the intake hole  302  is collected. This configuration is shown in  FIG. 12 . 
     The dirt collection tub  322  may be a replaceable paper envelope, as shown as an embodiment. Of course, though the dirt collection tub  322  may be a tub that can put in and taken out of the cleaning module  300  (i.e., removably attached to the cleaning module  300 ) so that collected dirt can be removed out of the tub. 
     The cleaning module  300  may include at least one UV-C emitter  330  that emits ultraviolet-c (UV-C). That is, the top of the mattress can be sterilized by the UV-C emitted by the UV-C emitter  330 . 
     The UV-C emitter  330  may be disposed at at least any one position on the bottom of the cleaning module  300  but may be disposed in multiple different positions on the cleaning module  300 . 
     The UV-C emitter  330  may be any one of a UV-C lamp and a UV-C LED. It is exemplified in an embodiment of the present disclosure that the UV-C emitter  330  is a UV-C LED. 
     Of course, only any one of the suction unit  320  and the UV-C emitter  330  may be provided at the cleaning module  300  or both of them may be provided. 
     It is exemplified in an embodiment of the present disclosure that the cleaning module  300  has both the suction unit  320  and the UV-C emitter  330 . In this case, the UV-C LED of the UV-C emitter  330  may be formed around the intake hole  302  formed on the bottom of the cleaning module  300 . 
     Meanwhile, the cleaning module  300  may be movably installed on any one of the front, rear, and top of the top frame  220 . 
     In this case, the rack gear  311  and pinion gear  312 , and the guide rail  222  and guide groove  301  may be provided or formed on the surfaces facing each other between the top frame  220  and the cleaning module  300 , respectively. 
     Next, the mattress care device according to an embodiment of the present disclosure may include a controller  400 . 
     The controller  400  is, as shown in  FIG. 13 , configured to control the operation of the moving module  200  and the cleaning module  300 . That is, the controller  400  controls the wheel-driving motors  213  to move the moving module  200  forward and backward while controlling and operates the cleaning module  300  by controlling the movement motor  313 , the fan motor  321 , and the UV-C emitter  330 . 
     The controller  400  may be disposed at the moving module  200  or may be disposed at the cleaning module  300 . The controller  400  may be provided at the cleaning module  300 . Of course, an operation unit  410  for manually operating the controller  400  may be provided at the moving module  200 . 
     In particular, the controller  400  may be configured to change the movement speed of the cleaning module  300  in accordance with the operation of the UV-C emitter  330 . 
     That is, when the UV-C emitter  330  emits light to emit UV-C, the moving module  200  or the cleaning module  300  is controlled to move slower than the movement speed when the UV-C emitter  330  does not emit light. 
     Accordingly, UV-C can be sufficiently emitted to the mattress  10  and a sterilization effect can be achieved. Further, it is possible to reduce the cleaning time when performing only suction without sterilization. 
     The controller  400  can control the moving module  200 , via the wheel-driving motors  213 , to stop when receiving a sensing signal from the stop position checker  240  disposed on the surfaces facing each other between the moving module  200  and the bed frame  100 . 
     Accordingly, the moving module  200  can be reciprocated between the head side and the foot side of the bed frame  100 . 
     The process of cleaning the mattress  10  using the mattress care device of the present disclosure described above is described hereafter in more detail. 
     First, when the mattress  10  is not cleaned, the moving module  200  of the mattress care devices is positioned and kept at the rear portion (foot side) of the mattress  10 . 
     In more detail, the moving module  200  may be kept in the storage part  140  when cleaning is not performed. This configuration is shown in  FIGS. 14 to 16 . 
     In particular, the moving module  200  may be positioned at the center portion of the bed manually by a user or by operation of the controller  400  through the operation unit  410  and then used as a bed table, (e.g., as a desk). 
     When a request for cleaning the mattress  10  is generated in the initial non-using state, the controller  400  controls the moving module  200  and the cleaning module  300  to clean the mattress  10 . 
     The request for cleaning the mattress  10  may be input (or operated) manually through the operation unit  410  by a user or may be automatically input at a predetermined cycle (or time). 
     In particular, when a request for cleaning the mattress  10  is generated, the controller  400  controls the moving module  200  to move to the rear (i.e., foot side) or the front (i.e., head side) of the bed frame  100  and controls the cleaning module  300  to move to any one side of the top frame  220 . These positions of the moving module  200  and the cleaning module  300  may be positions set in advance (i.e., set positions) for automatically perform cleaning. 
       FIGS. 17 to 19  show the state in which the moving module  200  and the cleaning module  300  come out of the storage part  140  and move to the set positions. 
     It is possible to recognize whether the moving module  200  has returned to the set position through the stop position checker  240 . 
     When the moving module  200  and the cleaning module  300  return to the set positions, the controller  400  controls the moving module  200  to move forward by operating the wheel-driving motors  213 . 
     While the moving module  200  moves, the controller  400  controls the suction unit  320  of the cleaning module  300  to operate. 
     Accordingly, the top of the mattress  10  is first suctioned into the cleaning module  300  and collected in the dirt collection tub  322 . 
     Further, the controller  400  operates the movement motor  313  of the cleaning module  300  when the moving module  200  moves forward, such that the cleaning module  300  moves in the longitudinal direction of the top frame  220 . 
     Accordingly, the cleaning module  300  suctions dirt on the top of the mattress  10  while being supported by the guide rail  222  and moves from a first side to an opposite second side (see  FIG. 20 ) of the top frame  220 . 
     The cleaning module  300  is moved when the moving module  200  is fully moved forward or fully moved backward and the movement distance is determined in consideration of the suction ability of the cleaning module  300 . That is, as shown in  FIG. 21 , while the moving module  200  and the cleaning module  300  are sequentially moved, the entire mattress  10  is uniformly cleaned. 
     Of course, cleaning module  300  and the moving module  200  may be simultaneously controlled to move left and right and move forward and backward, respectively. In this case, the speeds of cleaning module  300  and the moving module  200  are controlled in consideration of their routes, or the moving module  200  is controlled to repeatedly move forward and backward. 
     When the moving module  200  is moved, the operation speed of the wheel-driving motors  213  at the two side frames  210  or the rolling speeds of the rollable moving wheels  212  may be slightly different rather than completely the same. 
     If a speed difference is generated between the two side frames  210 , as shown in  FIG. 22 , the top frame  220  is inclined at both sides with respect to the center portion when seen from above. 
     However, since the protrusions  214  are formed at the lower ends of the two side frames  210  and support the outer sides of the side walls  120  of the bed frame  100 , the moving module  200  is not separated from the side walls  120  of the two side frames  210  and is not inclined such that poor operation is generated (i.e., in a configuration without rolling members  215 ). 
     Considering the rolling members  215  are disposed in the inners surface of the protrusions  214 , even though the protrusions  214  come in contact with the side walls  120 , the rolling members  215  come first in contact with the side walls  120  and roll, thereby removing any possible restriction. Accordingly, poor operation that the side frames  210  are restricted by the side walls  120  is prevented. 
     In particular, since the top frame  220  is installed to be rotatable with respect to the two side frames  210 , even though the moving module  200  is inclined (i.e., twisted), the top frame  220  maximally reduces a speed difference while rotating with respect to the two side frames  210 , whereby restriction and poor operation are prevented. 
     That is, when a speed difference is generated between the two side frames  210  and the moving module  200  is inclined to a side that is moved faster, the side frames  210  rotate by themselves while hitting against the outer surfaces of the side walls  120  of the bed frame  100 , whereby poor operation due to getting caught (i.e., frictionally engaging the side walls  120 ) can be prevented. 
     This configuration is shown in  FIGS. 22 and 23 . That is, a side frame  210  is rotated and hits (i.e., contacts) the side frame  210  against the outer surface of a side wall  120  of the bed frame  100 , and this rotation of the side frame  210  (i.e., via the rolling member(s)  215 ) prevents a restriction of movement of the side frame  210 . 
     While the mattress  10  is cleaned, the UV-C emitter  330  of the cleaning module  300  may be operated in accordance with a setting or an operation by a user. Of course, the UV-C emitter  330  may be controlled to be independently operated without operation of suction unit  320 . 
     When the UV-C emitter  330  is operated, UV-C is emitted to the surface of the mattress  10 , whereby harmful insects or bacteria existing at the mattress  10  die out. 
     In particular, when the UV-C emitter  330  of the cleaning module  300  is operated, the moving module  200  is controlled to move slower than when only the suction unit  320  is operated. 
     That is, when the UV-C emitter  330  is operated, the moving module  200  is controlled to slowly move, whereby sterilization effect by UV-C can be sufficiently achieved. 
     When the mattress  10  finishes being cleaned by the operation control described above, the controller  400  controls the moving module  200  and the cleaning module  300  to return to the initial set positions. 
     As a result, the mattress care device of the present disclosure can prevent poor movement while the two side frames  210  are moved along the two side walls  20  of the bed frame  100 , even if a speed difference is generated between the left and right sides when the moving module  200  is moved forward and backward. 
     That is, even though a speed difference is generated between the two side frames  210  and the moving module  200  is inclined to the faster side, the side frame  210  at the side rotates as much as hitting against the side wall  120  of the bed frame  100 , whereby the side frame  210  can be prevented from being caught by the side wall  120  and corresponding poor movement can be prevented. 
     Further, according to the mattress care device of the present disclosure, since even though the side frames  210  hit against the side walls  120 , they are not restricted (caught) by the protrusions  214  of the two side frames  210  and the rolling members  215  installed at the protrusions  214 , so poor operation can be prevented. 
     Further, the mattress care device of the present disclosure can uniformly clean the entire mattress  10  even though the left-right width of the cleaning module  300  is smaller than the left-right width of the mattress  10 . 
     That is, since the moving module  200  is installed to move forward and backward with respect to the mattress  10  and the cleaning module  300  is installed to move left and right with respect to the mattress  10 , the size of the cleaning module  30  can be reduced. 
     In particular, it is possible to perform sufficient sterilization even by providing a minimum UV-C LED, whereby the manufacturing cost can be reduced. 
     The mattress care device of the present disclosure is not limited only to the structure of the above embodiment. 
     For example, the mattress care device of the present disclosure may include a vibrator  250  at the cleaning module  300  (see  FIG. 24 ). That is, since the vibrator  250  is additionally provided, dirt, such as dust, on the surface of the mattress  10  can be separated to be easily suctioned while the surface of the mattress  10  over which the cleaning module  300  moves is hit. 
     The vibrator  250 , as shown in  FIG. 24 , may include a vibration source  251 , such as an ultrasonic oscillator or a vibration motor, and a vibration plate  252  that is vibrated up and down by operation of the vibration source  251 . 
     The rollable moving wheels  212  installed on the bottoms of the two side frames  210  may be formed to surround the upper ends of the side walls  120  of the bed frame  100 . 
     That is, as shown in  FIG. 25 , a recessed groove  212   a  in which the side wall  120  is accommodated is formed in the moving wheel  212 . Accordingly, the two side frames  210  can accurately move along the side walls  120  even without adding the protruding ends  214  or the rolling members  215 . 
     Of course, according to the structure in which the moving wheels  212  surround the upper ends of the side walls  120 , the possibility of restriction, such as getting caught, is high when the moving module  200  is inclined (twisted) left and right due to a speed difference between both sides while moving. 
     However, since the top frame  220  of the moving module  200  can rotate with respect to the two side frames  210 , such restriction can be prevented, so the moving wheels  212  can be formed to surround the upper ends of the side walls  120 . 
     Accordingly, the mattress care device of the present disclosure can be achieved in various ways. 
     Various embodiments described herein may be implemented in a computer-readable medium using, for example, software, hardware, or some combination thereof. For example, the embodiments described herein may be implemented within one or more of Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a selective combination thereof. In some cases, such embodiments are implemented by the controller. That is, the controller is a hardware-embedded processor executing the appropriate algorithms (e.g., flowcharts) for performing the described functions and thus has sufficient structure. Also, the embodiments such as procedures and functions may be implemented together with separate software modules each of which performs at least one of functions and operations. The software codes can be implemented with a software application written in any suitable programming language. Also, the software codes can be stored in the memory and executed by the controller, thus making the controller a type of special purpose controller specifically configured to carry out the described functions and algorithms. Thus, the components shown in the drawings have sufficient structure to implement the appropriate algorithms for performing the described functions. 
     The present invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.