KR20190030092A - Refrigerator - Google Patents

Abstract

According to an embodiment of the preset invention, a refrigerator comprises: a main body in which a storage chamber is formed; an inner body which is stored in the storage chamber, and on which foods are placed; a cooling apparatus mounted on the main body to cool the storage chamber; a plurality of weight sensors installed at a height of one over eight or less of the whole height of the main body from the lower end of the main body; and a control unit sensing a weight and location of foods accordance with sensed values of the weight sensors. Accordingly, weight change and location of foods located in a wide area in the storage chamber can be sensed while the number of the weight sensors is minimized.

Description

Refrigerator {Refrigerator}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and more particularly, to a refrigerator capable of sensing the weight and position of an object to be cooled contained in the storage compartment.

BACKGROUND ART A refrigerator is a device for preventing an object to be cooled (hereinafter referred to as " food ") such as foods, medicines and cosmetics from being cooled or stored at a low temperature to prevent decay and alteration.

The refrigerator includes a storage room for storing food and a cooling device for cooling the storage room.

The refrigerator may include a main body having a storage chamber and a door opening and closing the storage chamber, and the cooling device may be mounted on the main body to cool the storage chamber.

The cooling device may include a compressor through which the refrigerant is circulated, a condenser, an expansion mechanism, and an evaporator.

The refrigerator may further include a blowing fan for circulating the air in the storage compartment to the evaporator and the storage compartment. The blower fan may be disposed in the periphery of the evaporator and may form a flow of air to the storage room after the air in the storage compartment flows to the evaporator.

The refrigerator may be provided with an inner body such as a shelf, a drawer or a basket on which the food is placed. The inner body can be located inside the storage compartment, and the food can be placed on the inner body after being inserted into the storage compartment.

In recent years, there is a tendency to display information of foods stored inside the refrigerator to the outside, and an example of such a refrigerator is disclosed in Korean Patent Registration No. 10-1635570 B1 (published on Jul. 01, 2016).

A refrigerator disclosed in Korean Patent Publication No. 10-1635570 B1 (published on Jul. 01, 2016) is provided with a pressure sensor on a shelf, a drawer or a basket, and uses a pressure applied from the food to the pressure sensor, Can be detected. Such a pressure sensor may be composed of a plurality of pressure detecting elements.

However, when a pressure sensor is installed on a shelf, a drawer, or a basket as described above, the pressure sensor can be increased in number, and the internal structure of the refrigerator can be complicated, There is a problem that the manufacturing cost is increased.

Korean Registered Patent No. 10-1635570 B1 (issued on July 01, 2016)

An object of the present invention is to provide a refrigerator which can detect a weight change or position of a food while minimizing the number of weight sensors.

According to an aspect of the present invention, there is provided a refrigerator comprising: a main body having a storage chamber; An inner body which is housed in the storage room and on which the food is placed; A cooling device mounted on the main body to cool the storage chamber; A plurality of weight sensors provided at a height not more than 1/8 of the total height of the main body from the bottom of the main body; And a controller for sensing the weight and position of the food according to the sensed values of the plurality of weight sensors.

The main body includes a cabinet in which a storage room is formed; A door for opening and closing the storage chamber; And a plurality of legs mounted on a lower portion of the cabinet.

An example of a weight sensor may be provided in each of the plurality of legs.

The leg comprises a leg base; The leg base may include a lifting leg that is adjustably connected to the leg base, and the weight sensor may be installed in the lifting leg.

A plurality of weight sensors may be disposed in contact with the bottom surface of the cabinet.

Another example of the weight sensor may be provided such that a plurality of weight sensors are spaced apart from each other in the cabinet.

The weight sensor may be installed closer to the apex of the cabinet than the center of the cabinet.

The cabinet comprises an outer cabinet; And an inner case disposed inside the outer cabinet and having a storage room therein, and the plurality of weight sensors may be disposed between the outer cabinet and the inner case.

The cabinet may further include a heat insulating material disposed between the outer cabinet and the inner case, and the heat insulating material may surround the outer surface of the weight sensor and be in contact with the weight sensor.

The plurality of weight sensors may be disposed in contact with the bottom surface of the inner case.

The cabinet may include an inner case seating body on which the inner case is seated, and a plurality of weight sensors may be disposed in contact with the inner case seating body.

A plurality of weight sensors can be installed at the same height in the main body.

The control unit may measure the weight change value of each of the plurality of weight sensors and calculate the food position on the horizontal plane based on the distribution of the weight change measured by the plurality of weight sensors.

According to the embodiment of the present invention, the weight and position of the food put into the storage room can be sensed while minimizing the number of weight sensors.

1 is a front view of a refrigerator according to an embodiment of the present invention;
FIG. 2 is a front view illustrating the interior of a refrigerator according to an embodiment of the present invention. FIG.
Figure 3 is a cross-sectional view of the lug shown in Figure 1,
FIG. 4 is a bottom view of a refrigerator according to an embodiment of the present invention;
5 is a control block diagram of a refrigerator according to an embodiment of the present invention,
6 is a view illustrating the inside of a refrigerator according to another embodiment of the present invention.
FIG. 7 is a bottom view of a plurality of weight sensors according to another embodiment of the present invention,
8 is a view illustrating the inside of a refrigerator according to another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of a refrigerator according to an embodiment of the present invention, FIG. 2 is a front view showing the inside of a refrigerator according to an embodiment of the present invention, FIG. 3 is a sectional view of the lug shown in FIG. 1, 4 is a bottom view of a refrigerator according to an embodiment of the present invention, and FIG. 5 is a control block diagram of a refrigerator according to an embodiment of the present invention.

The present embodiment includes a main body 1, an inner body 2, a cooling device 6, and a plurality of weight sensors 100.

The main body 1 may have at least one storage chamber F (R). The main body 1 may include a plurality of storage chambers, and the plurality of storage chambers may include a cooling chamber F cooled to a zero temperature range and a refrigerating chamber R cooled to a temperature range of an image.

The main body 1 includes a cabinet 10 having a storage room F (R) formed therein; A door 20 (30) for opening and closing the storage room (F) R; And a plurality of legs 40 mounted to the lower portion of the cabinet 10.

The cabinet 10 may be composed of a combination of a plurality of members, and may be configured to insulate the storage compartment F (R) from the outside.

The cabinet 10 may include a freezer compartment F and a refrigerating compartment R. In this case, the cabinet 10 may include a barrier 11 for partitioning the freezing compartment F and the refrigerating compartment R. The cabinet 10 may be in the form of a rectangular parallelepiped or a cuboid as a whole, and may be arranged long in the vertical direction.

The cabinet 10 may include an outer cabinet 12 forming an outer appearance of the main body 1 and at least one inner case 13 and 14 forming a storage compartment F (R).

The outer cabinet 12 may have a hexahedral shape as a whole, and may be formed long in the vertical direction.

A plurality of inner cases 13 and 14 may be provided inside the outer cabinet 12. In this case, a plurality of inner cases 13 and 14 may be disposed left and right with the barrier 11 therebetween And can be arranged up and down with the barrier 11 interposed therebetween.

The plurality of inner cases 13 and 14 may include a freezing room inner case 13 having a freezing room F formed therein and a refrigerating room inner case 14 having a refrigerating room R formed therein.

The cabinet 10 can be configured such that the freezer compartment inner case 13 and the refrigerating compartment inner case 14 are spaced apart from each other with a long barrier between them in the vertical direction, It is possible that the first barrier ribs 14 are vertically spaced apart from each other with a long barrier interposed therebetween in a horizontal direction.

A plurality of doors 20 (30) can be installed in the main body 10. When the freezing chamber F and the refrigerating chamber R are formed in the main body 10, the doors 20 and 30 include at least one freezing chamber door 20 for opening and closing the freezing chamber F, And one refrigerator compartment door 30.

The doors 20 and 30 may be rotatably connected to the cabinet 10 by a hinge and the loads of the doors 20 and 30 may be transmitted to the cabinet 10. [

The plurality of legs 40 may be spaced apart from each other at a lower portion of the cabinet 10. As shown in Fig. 4, at least four legs 40 may be installed in the lower portion of the cabinet 10. [ The legs 40 can be installed closer to the bottom surface vertex V of the cabinet 10 out of the bottom surface center C of the cabinet 10 and the bottom surface vertex V of the cabinet 10.

The plurality of legs 40 include a first leg 41 on the front left side, a second leg 42 on the front right side, a third leg 43 on the rear left side and a fourth leg 44 on the rear right side .

At least one of the plurality of legs 40 may be adjustable in height, and the plurality of legs 40 may include a leg base 45, as shown in FIG. And a lifting leg 46 that is adjustably connected to the leg base 45.

The leg base 45 can be brought into contact with the bottom of the place where the refrigerator is installed.

The lifting leg 45 can be height-adjustably coupled to the leg base 45. One of the leg base 45 and the elevating leg 45 may be formed with a male thread and the other one of the leg base 45 and the elevating leg 45 may be formed with a female screw threadably engaged with the male screw. The lifting leg 45 can be raised or lowered with respect to the leg base 45.

The inner body 2 may be at least one of a drawer 3, a shelf 4 and a basket 5 as shown in Fig. The inner body 2 may be a food supporter for supporting the food placed thereon.

The inner body 2 which is at least one of the drawer 3 and the shelf 4 and the basket 5 can be accommodated in the storage room F and the food is stored in the drawer 3 and the shelf 4, And the basket (5).

The drawer 3 can be received in the storage chamber F (R) so as to be drawn out to the outside of the storage chamber F (R). The shelf 4 may be disposed in the storage room F (R) or on the rear side of the doors 20 (30). The basket 5 may be disposed in the storage room F (R) or on the rear side of the doors 20 (30).

The cooling device 6 can be mounted on the main body 1 and can cool the storage room F (R). The cooling device 6 can be mounted in the cabinet 10 of the main body 1. [

5) for compressing the refrigerant, a condenser (not shown) for condensing the refrigerant compressed in the compressor 61, and an expansion mechanism (not shown) for decompressing the refrigerant condensed in the condenser 61 And an evaporator 64 in which the refrigerant decompressed by the expansion mechanism is evaporated.

The evaporator 64 may be disposed inside at least one of the freezing compartment inner case 13 and the refrigerating compartment inner case 14.

The cooling device 6 may further include a condensing fan 65 (see FIG. 5) for blowing air outside the refrigerator to the condenser.

The cooling device 6 may further include a cooling fan 66 that circulates cool air in the storage compartment to the evaporator 64 and the storage compartment.

The cooling fan 66 can be installed in the inner case provided with the evaporator 64. When the cooling fan 66 is driven, the air in the storage room is cooled by the evaporator 64 and then cooled by the evaporator 64 The cooled air can be discharged to the storage room to cool the storage room.

The plurality of weight sensors 100 may be composed of a sensor capable of sensing weight, such as a load cell, a strain gauge, a piezoelectric element, or the like.

It is preferable that the plurality of weight sensors 100 are installed at a position where the weight of the large area of the storage room can be sensed while the number of the weight sensors 100 is minimized and a plurality of weight sensors 100 are not installed in the inner body 2, And can be installed in the main body 1.

The load acting on the lower part of the main body 1 may be different depending on the weight of the food or the position of the food when the food is put into the storage room F, It is possible to detect a change in the weight acting on the lower portion of the main body 1 in a state where it is mounted on the lower portion of the main body 1. [

The plurality of weight sensors 100 may be installed at a height H2 that is 1/8 or less of the total height H1 of the main body 1 from the lower end 1A of the main body 1. [

The main body 1 has a lower region L in which the region from the lower end 1A to the upper end 1B is 1/8 or less of the total height H1 of the main body 1 and an upper region H , And a plurality of weight sensors 100 may be installed in the lower region L. [

The lower end 1A of the main body 1 may be the lower end of the leg 40 and the upper end 1B of the main body 1 may be the upper end of the cabinet 10. [

The plurality of weight sensors 100 can sense the weight of the area higher than the installation height. When the plurality of weight sensors 100 are installed too high in the main body 1, the area in which the weight of the food in the storage chamber F (R) can not be sensed can be increased. On the other hand, the plurality of weight sensors 100 may be installed at a height H2 less than 1/8 of the total height H1 of the main body. In this case, Can be minimized.

The plurality of weight sensors 100 are installed in the main body 1, and their installation heights may be the same.

The weight sensor 100 may be placed in contact with the bottom surface 10A of the cabinet 10. [ In this case, the load of the food in the storage room F (R) can be transmitted to the cabinet 10 through the inner body 2, and the refrigerator can sense a change in load due to the input and withdrawal of the food.

The weight sensor 100 may be installed in the leg 40 of the body 1. [ The weight sensor 100 may be installed on the lifting leg 46 of each of the plurality of legs 40.

The weight sensor 100 may be coupled to the lifting leg 45 and the weight sensor 100 may be coupled to the lifting leg 45 by a first fastening member 105 such as a screw. The weight sensor 100 can be brought into contact with the upper surface of the lifting leg 45.

The weight sensor 100 may be coupled to the cabinet 10 by a second fastening member 106 such as a screw.

The upper surface of the weight sensor 100 may be in contact with the bottom surface 10A of the cabinet 10. [

The weight sensor 100 can be disposed between the upper surface of the lifting leg 45 and the bottom surface of the cabinet 10 and can control the load of the cabinet 10 and the load of the door 20 R may be exerted on the weight sensor 100. [0050]

While the refrigerator continues to be used, the load of the cabinet 10 and the load of the door 20 (30) are constant.

On the other hand, the load of the food contained in the storage room F (R) may vary depending on the input and withdrawal of the food.

When the weight of the cabinet 10 and the weight of the door 20 (30) are removed from the weight detected by the weight sensor 100, the weight of the food stored in the storage room F (R) can be calculated.

The weight sensor 100 may be disposed between the cabinet 10 and the leg 40 to serve as a connector that connects the cabinet 10 to the leg 40 and allows the leg 40 to be installed in the cabinet 10. [ .

The weight sensor 100 may be installed in each of the plurality of legs 40 and the number of the weight sensors 100 may be equal to the number of the legs 40. That is, the weight sensor 100 and the leg 40 may correspond one to one.

As shown in FIG. 4, the plurality of weight sensors 100 include a first weight sensor 101 installed on the first leg 41, a second weight sensor 102 installed on the second leg 42, A third weight sensor 103 provided on the third leg 43 and a fourth weight sensor 104 provided on the fourth leg 44. [

Hereinafter, a common configuration of a plurality of weight sensors 100 will be described as a weight sensor 100. When a plurality of weight sensors 100 are distinguished from each other, a first weight sensor 101 and a second weight sensor 102 The third weight sensor 103, and the fourth weight sensor 104 will be described.

Meanwhile, the refrigerator may further include a control unit 7 as shown in FIG.

The control unit 7 controls the refrigerator, and can control the compressor 61, the condensing fan 65, and the evaporating fan 66.

The refrigerator may further include an input unit 8 that the user inputs to control the operation of the refrigerator. The input unit 8 may be configured to input a desired freezing room temperature, a desired freezing room temperature, and the like. The control unit 7 can control the refrigerator according to an instruction input through the input unit 8. [

The refrigerator may further include a display (9). The control unit 7 controls the display 9

It is possible to control the display 9 to display various kinds of operation information of the refrigerator, temperature information such as the freezing room desired temperature and the desired temperature of the refrigerator, and information of the food stored in the storage room.

The control unit 7 can sense the weight and position of the food according to the sensed values of the plurality of weight sensors 100.

The control unit 7 can measure the weight change value of each of the plurality of weight sensors 100. [ The control unit 7 can calculate the weight of the food and the horizontal plane position of the food based on the distribution of the weight change measured by the plurality of weight sensors 100. [

The control unit 7 can control the display 9 so that the weight and the position of the food thus calculated are displayed on the display 9. [

Hereinafter, a method of calculating the position of food using the plurality of weight sensors 100 will be described.

W _a , W _b , W _c , and W _d , the weight measured by each of the weight sensors 101, 102, 103, and 104, The weight of the newly introduced food into the storage room can be distributed to each of the weight sensors 101, 102, 103 and 104 through the inner body 2 and the cabinet 10, The weight change values W _a , W _b , W _c and W _d before and after the food introduction can be calculated according to the sensed values sensed by the weight sensors 101, 102, 103 and 104.

The total weight of the food put into the storage room may be the total sum of absolute values of the weight change values (W = W _a + W _b + W _c + W _d ) The weight of the food can be calculated.

The control unit 7 can detect the position of the food that is newly inserted into the storage room according to Equations (1) and (2) described later. When the food is put into the storage chamber and then placed on the inner body 2, the weight sensors 101, 102, 103 and 104 can detect a change in weight regardless of the position of the food in the storage room.

When the length of the main body 1 in the left-right direction is Lx, the lateral position x of the food can be calculated by the following equation (1) Can be calculated by Equation (2).

[Equation 1]

_{x = Lx (W b + W} d) / (W a + W b + W c + W d)

&Quot; (2) "

y = Ly (W _a + W _b ) / (W _a + W _b + W _c + W _d )

The control unit 7 can calculate the positional coordinates on the horizontal plane of the food calculated by Equations (1) and (2).

That is, the control unit 7 can calculate the weight and position of the food to be newly introduced into the storage room by using the plurality of weight sensors 100 as described above.

The control unit 7 can store the weight data and the position data of the food in a storage unit (not shown) every time a change value of the weight sensed by the plurality of weight sensors 100 is sensed, Data and location data can provide convenience in using the refrigerator.

On the other hand, the user can move the position of the food without removing the food stored in the storage room to the outside. In this case, the total sum of the absolute values of the change values of the weight sensed by each weight sensor 100 is the same, ) Can calculate new horizontal plane position coordinates calculated by Equations (1) and (2). The control unit 7 may control the display 9 to cause the display 9 to display a change in the position of the food.

The control unit 7 can cause the display 9 to monitor the weight and position of the food.

The refrigerator may further include a communication element 9 'such as a wife module communicating with an external device. The controller 7 may control the weight and the position of the food to be sensed by using the plurality of weight sensors 100, As shown in FIG.

FIG. 6 is a view illustrating the inside of a refrigerator according to another embodiment of the present invention, and FIG. 7 is a bottom view of a plurality of weight sensors according to another embodiment of the present invention, together with an inner case.

The main body 1 of the present embodiment is similar to the main body of the embodiment of the present invention, and includes a cabinet 10 in which a storage room F (R) is formed; A door 20 (30) for opening and closing the storage room (F) R; The cabinet 10 may include a plurality of legs 40 mounted on a lower portion of the cabinet 10 and a plurality of weight sensors 100 of the present embodiment may be installed in the cabinet 10.

Since other structures and operations other than the installation position of the weight sensor 100 are the same as or similar to those of the embodiment of the present invention, the same reference numerals are used for other components than the weight sensor 100, It is omitted.

A plurality of weight sensors 100) may be installed in the cabinet 10 so as to be spaced apart from each other.

The weight sensor 100 may be installed closer to the vertex V of the cabinet 10 than the center C of the cabinet 10. [

A plurality of weight sensors 100) may be installed on the bottom surface of the cabinet 10 or may be installed inside the cabinet 10.

A plurality of weight sensors 100) may be installed inside the cabinet 10 so as to be spaced apart from each other.

The cabinet 10 includes an outer cabinet 12; Inner cases 13 and 14 which are disposed inside the outer cabinet 12 and in which a storage room is formed and insulation members 15 arranged between the outer cabinet 12 and the inner cases 13 and 14 A plurality of weight sensors 100) may be disposed between the outer cabinet 12 and the inner cases 13,

A plurality of inner cases 13 and 14 may be provided inside the outer cabinet 12. In this case, a plurality of inner cases 13 and 14 may be disposed left and right with the barrier 11 therebetween And can be arranged up and down with the barrier 11 interposed therebetween.

The heat insulating material 15 may wrap around the outer surface of the weight sensor 100 and may contact the weight sensor 100.

A plurality of weight sensors 100) may be installed on the main body 1 with the same installation height.

The weight sensor 100 may be mounted in contact with the inner cases 13 and 14 and may be mounted in contact with the bottom surfaces of the inner cases 13 and 14.

The weight sensor 100 can be disposed in contact with each of the inner cases 13 and 14 and can be disposed in contact with a part of the inner cases 13 and 14. [

When a plurality of inner cases 13 and 14 are arranged left and right with the barrier 11 interposed therebetween, the plurality of weight sensors 100 are connected to a weight sensor (not shown) contacting one of the inner cases 13 and 14 111) 113 and a weight sensor 112 (114) in contact with the other of the inner cases (13), (14).

A plurality of weight sensors 100 are disposed on the inner case 13 and the inner case 13 which are located further down than the inner cases 13 and 14 when the inner cases 13 and 14 are arranged above and below the bearings 11, (14).

The embodiment of the present invention includes the legs 40 as in the present invention, and the legs 40 of this embodiment can be directly fastened to the lower portion of the cabinet 10.

8 is a view illustrating the inside of a refrigerator according to another embodiment of the present invention.

The cabinet of the present embodiment may further include an inner case seating body 16 on which the inner case 14 is seated and a plurality of weight sensors 100 may be disposed in contact with the inner case seating body 16, The other components and functions of the case mounting body 16 and the plurality of weight sensors 100 are the same as or similar to those of the other embodiments of the present invention, and therefore, the same reference numerals are used and a detailed description thereof will be omitted.

The inner case mounting body 16 includes a lower plate 17 which is in contact with the bottom surface of the inner case 14 and a weight sensor contact body 18 which is protruded from the lower plate 17 and in contact with the weight sensor 100 can do.

The weight sensor contact body 18 may include a horizontal plate 19A on which the weight sensor 100 contacts the bottom surface. The weight sensor contact body 18 may further include a connector 19B connecting the lower plate 17 and the horizontal plate 19A.

The connector 19B may protrude upward or downward from the lower plate 17 and the horizontal plate 19A may protrude horizontally from the upper or lower end of the connector 19B.

 The weight sensor contact body 18 may be provided for each of the weight sensors 100. In this case the weight sensor contact body 18 may be of the same number as the weight sensor 100 and the weight sensor contact body 18 18 and the weight sensor 100 can be 1: 1 correspondence.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: Body 2: Drawer
3: Line number 4: Basket
5: Cooling unit 6: Control unit
10: cabinet 20, 30: door
40: Leg 100: Weight sensor

Claims (12)

A body having a storage chamber;
An inner body which is housed in the storage room and on which food is loaded;
A cooling device mounted on the main body to cool the storage chamber;
A plurality of weight sensors installed at a height of 1/8 or less of the entire height of the main body from the bottom of the main body;
And a controller for sensing the weight and position of food according to the sensed values of the plurality of weight sensors. The method according to claim 1,
The body
A cabinet in which a storage room is formed;
A door for opening and closing the storage room;
And a plurality of legs mounted on a lower portion of the cabinet,
Wherein the weight sensor is installed in each of the plurality of legs. 3. The method of claim 2,
The leg
A leg base;
And a lifting leg that is adjustably connected to the leg base,
Wherein the weight sensor is mounted on the lifting leg. 3. The method of claim 2,
And the plurality of weight sensors are disposed in contact with the bottom surface of the cabinet. The method according to claim 1,
The body
A cabinet in which a storage room is formed;
A door for opening and closing the storage room;
And a plurality of legs mounted on a lower portion of the cabinet,
Wherein the plurality of weight sensors are spaced apart from each other in the cabinet. 6. The method of claim 5,
Wherein the weight sensor is disposed closer to a vertex of the cabinet than a center of the cabinet. 6. The method of claim 5,
The cabinet includes an outer cabinet;
And an inner case disposed inside the outer cabinet and having a storage chamber formed therein,
Wherein the plurality of weight sensors are disposed between the outer cabinet and the inner case. 8. The method of claim 7,
Wherein the cabinet further comprises a heat insulating material disposed between the outer cabinet and the inner case,
Wherein the heat insulating material surrounds the outer surface of the weight sensor and contacts the weight sensor. 8. The method of claim 7,
And the plurality of weight sensors are disposed in contact with the bottom surface of the inner case. 8. The method of claim 7,
Wherein the cabinet includes an inner case seating body on which the inner case is seated,
And the plurality of weight sensors are disposed in contact with the inner case seating body. The method according to claim 1,
Wherein the plurality of weight sensors are installed at the same height in the main body. The method according to claim 1,
Wherein the control unit measures the weight change value of each of the plurality of weight sensors and calculates the food position on the horizontal plane based on the distribution of the weight change measured by the plurality of weight sensors.

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