KR20190080070A - Laundry treating apparatus - Google Patents

Abstract

A laundry treating apparatus of the present invention comprises: a water storage tank in which water is stored; a first washing tank rotationally provided in the water storage tank to accommodate a first laundry, and rotated around a vertical shaft; a second washing tank accommodating a second laundry, and separably coupled to the first washing tank to be integrally rotated along with the first washing tank; and a locker provided at the second washing tank to fixate the second washing tank to prevent the same from being displaced from the first washing tank during rotation thereof. Here, the locker comprises: a locking member located at a first location in a state in which the second washing tank is stopped, and moved to a second location from the first location by centrifugal force when the second washing tank is rotated, and fixating the second washing tank at the first washing tank by being linked with the first washing tank at the second location; and an elastic member elastically deformed when the locking member is at the second location, before being recovered to the original shape when the rotation of the second washing tank is stopped to return the locking member to the first location.

Description

{LAUNDRY TREATING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a laundry processing apparatus, and more particularly, to a laundry processing apparatus having a second washing tub detachably installed in a first washing tub.

The laundry processing apparatus is a device that processes laundry through various operations such as washing, dehydrating and / or drying. The laundry processing apparatus is a washing machine for removing contaminants from laundry (hereinafter, also referred to as "cloth") using water and detergent, a drum for wet laundry being rotated at a high speed, a dehydrator for dehydrating the laundry, A dryer for drying the laundry by supplying dry air into the loaded drum, and a drying and washing machine having a drying function and a washing function.

Recently, a washing machine provided with two washing tanks is provided. Such a washing machine has a large-capacity washing tank and a small-capacity washing tank, and each washing tank is separated from each other. Such a washing machine is convenient because each washing machine can be used at the same time or at the same time according to the user's needs. Further, if a small washing amount is required, only a small capacity washing machine can be used, which is very economical. However, in such a conventional washing machine, since the two washing tanks are separated from each other, the overall size of the product can not be increased due to the spaces accommodating the washing tanks, and the driving units for driving the washing tanks, Because of the need for utensils and two drainage devices for drainage, the price of the product also rose.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a washing machine and a washing machine which are capable of preventing laundry from being separated from the first washing tub while the first washing tub and the second washing tub installed on the upper part of the first washing tub are integrally rotated, Thereby providing a device.

Second, it is an object of the present invention to provide a cleaning agent treatment apparatus which prevents the vertical movement of the second washing tank while the first washing tank and the second washing tank are integrally rotated.

Third, during the rotation, the second washing tub and the first washing tub are automatically locked, and when the rotation is stopped, the laundry is automatically released.

A washing machine according to the present invention comprises: a water storage tank for storing water; a first washing tank rotatably installed in the water storage tank for receiving the first laundry and rotated about a vertical axis; A second washing tub detachably coupled to the first washing tub and integrally rotated with the first washing tub; and a second washing tub provided in the second washing tub and fixed so as not to be detached from the first washing tub while the second washing tub is rotated Includes lockers.

Wherein the locker is moved from the first position to the second position by centrifugal force when the second washing tub is rotated and is located at a first position when the second washing tub is stopped, A locking member for fixing the second washing tub to the first washing tub by engaging with the first washing tub; and a locking member for elastically deforming the locking member when the locking member is in the second position, And an elastic member for returning the locking member to the first position.

Alternatively, the laundry processing apparatus of the present invention may include a water storage tank for containing water, a first washing tub rotatably provided in the water storage tank for receiving the first laundry and rotating about a vertical axis, A second washing tub detachably coupled to the first washing tub and rotated integrally with the first washing tub; and a second washing tub provided in any one of the first washing tub and the second washing tub, 1 < / RTI > washing tub and the other of the second washing tub.

Wherein the locker is supported by the elastic member and is located at a first position in a state where the second washing tub is detached from the first washing tub and the second washing tub is installed in the first washing tub The first washing tub and the second washing tub are moved from the first position to the second position by interference with the other of the first washing tub and the second washing tub, and when the second washing tub is mounted to the first washing tub, And a locking member for returning to the first position to engage with the other one in the first position and fixing the second washing tub to the first washing tub.

The laundry processing apparatus of the present invention can prevent the second washing tub from being separated from the first washing tub while the first washing tub and the second washing tub installed on the upper portion of the first washing tub are integrally rotated.

Particularly, while the first and second washing tanks are integrally rotated, it is possible to prevent the vertical movement of the second washing tub from occurring, so that the second washing tub impacts the door positioned above the second washing tub The phenomenon does not occur. Therefore, it is possible to prevent the breakage of the apparatus from occurring, and it is possible to prevent a safety accident.

Also, during the rotation, the second washing tub and the first washing tub are automatically locked, and when the rotation is stopped, the locked state is automatically canceled, thereby improving the usability. Particularly, this locking process is not a method using a separate electric power but a centrifugal force naturally generated by rotation or an elastic force of an elastic member, so that the structure for locking is simple and the manufacturing cost is low.

Further, since the lock is released without any additional operation by the user in the state that the operation of the laundry processing apparatus is finished, the user can remove the second washing tub without needing to be aware that the lock is released, It is effective.

1 is a side cross-sectional view of a laundry processing apparatus according to an embodiment of the present invention.
2 is a perspective view of the second washing tub.
3 shows a state in which the second washing tub is disassembled.
4 is a top view of the second washing tub mounted on the balancer.
FIG. 5 is a cross-sectional view taken along the line IV-IV in FIG. 4, showing a state in which the locking member is in the first position.
6 shows a state in which the locking member is in the second position.
Figure 7 shows another embodiment of the locker.

1 is a side cross-sectional view of a laundry processing apparatus according to an embodiment of the present invention. 2 is a perspective view of the second washing tub. 3 shows a state in which the second washing tub is disassembled. 4 is a top view of the second washing tub mounted on the balancer.

1 to 4, the cabinet 2 forms an outer appearance of the laundry processing apparatus, and forms a space in which the water storage tank 4 is housed inside. The cabinet 2 is supported by a flat cabinet base 5, the top surface is open, and may include front, left, right, and rear surfaces.

The top cover 3 may be coupled to the open upper end of the cabinet 2. [ The top cover 3 may be provided with a charging port for charging and discharging laundry (or " capsule "). A door (not shown) for opening and closing the inlet may be rotatably coupled to the top cover 3.

The water storage tank 4 is for storing wash water, and can be suspended in the cabinet 2 by the support rod 15. The support rods 15 may be provided at four corners of the cabinet 2, one end of each support rod 15 is pivotally connected to the top cover 3, Is connected to the water storage tank (4) by the water supply pipe (27).

The water storage tank 4 is opened on the upper surface, and the water storage tank cover 14 is provided on the opened upper surface. The reservoir cover (14) is formed in the form of a ring having a substantially circular opening at its center, and laundry is introduced through the opening.

In the water storage tank 4, a first washing tub 6 accommodating laundry and rotated about a vertical axis O (see FIG. 4) may be disposed. The vertical axis is substantially perpendicular to the paper surface, and may be accurately aligned on a vertical line with the paper surface, but may be inclined at a predetermined angle (preferably, 5 degrees or less) with respect to the vertical line. The first washing tub 6 may be provided with a plurality of through holes through which water may pass and water may be exchanged between the first washing tub 6 and the water storage tank 4 through the through holes.

The first washing tub 6 may include a drum 61 having an opened upper side and a ring balancer 62 coupled to the upper side of the drum 61. The lower side of the drum 61 can be connected to the rotary shaft of the driving unit 8 by the hub 29. The through hole may be formed in the drum 61.

The balancer 62 compensates for the eccentricity caused when the drum 61 rotates. Annular cavities 62a and 62b (see Fig. 5) may be formed on the inner side of the balancer 62. Fig. Fluids (e.g., brine) or a plurality of weights (e.g., metal spheres) may be inserted into the cavities 62a, 62b. The annular cavities 62a and 62b have different diameters, but a plurality of annular cavities may be formed.

When the drum 61 is rotated to one side, the fluid or the weight is moved in a direction opposite to the direction in which the drum 61 is displaced, thereby correcting the eccentricity. Since the ring-shaped balancer 62 applied to the laundry processing apparatus has already been known in various forms, the further description thereof will be omitted.

And a second washing tub 100 attached to and detached from the first washing tub 6 is provided. The second washing tub 100 receives the laundry and is detachably coupled to the first washing tub 6. When the first washing tub 6 is rotated while the second washing tub 100 is installed, the second washing tub 100 is also rotated integrally with the first washing tub 6.

The user may insert the first laundry into the first washing tub 6 or install the second washing tub 100 in the state where the second washing tub 100 is not yet installed, 2 Laundry can be put in.

A pulsator (9) can be rotatably provided on the inner lower side of the first washing tub (6). The pulsator 9 may include a plurality of upwardly projecting radial ribs. When the pulsator 9 is rotated, water flow can be formed by the ribs.

In the cabinet 2, a first washing tub 6 and a driving unit 8 for providing power for rotating the pulsator 9 may be disposed. The driving unit 8 may be provided below the water storage tank 4 and may be provided in the form of hanging in the cabinet 2 together with the water storage tank 4. The rotary shaft of the driving unit 8 is always engaged with the pulsator 9 and can be engaged or disengaged from the first washing tub 6 according to the switching operation of the clutch (not shown). The pulsator 9 and the first washing tub 6 are integrally rotated when the driving unit 8 is operated with the rotating shaft of the driving unit 8 engaged with the first washing tub 6, When the rotary shaft is operated in a state of being separated from the first washing tub 6, only the pulsator 9 is rotated in the state where the first washing tub 6 is stopped.

The driving unit 8 may include a washing motor capable of speed control. The washing motor may be an inverter direct drive motor. The control unit (not shown) may include a proportional-integral controller (PI controller), a proportional-integral-differential controller (PID controller), and the like. The controller receives an output value (e.g., an output current) of the washing motor as an input, and based on the output value, determines whether the rotational speed (or rotational speed) of the washing motor follows a predetermined target rotational speed Can be controlled.

It is to be understood that the control unit can control not only the washing motor but also the entire operation of the laundry processing apparatus, and that the control of the respective constitutions described below is performed by the control unit.

On the other hand, the laundry processing device may include at least one water supply pipe 11 for guiding water supplied from an external water source such as a faucet. The at least one water supply pipe 11 may include a cold water pipe (not shown) for receiving cold water from an external water source and a hot water pipe (not shown) for receiving hot water.

A water supply unit 13 for supplying water supplied from an external water source to the first washing tank 6 and / or the second washing tank 100 may be provided. The water supply unit (13) can selectively intermittently control the at least one water supply pipe (11). To this end, the water supply section 13 may include at least one water supply valve. When the at least one water supply valve is opened under the control of the control unit, water is supplied to the dispenser 16 through the water supply pipe corresponding to the opened water supply valve.

The dispenser 16 supplies the additive acting on the laundry together with the water supplied through the water supply pipe 11. The additives supplied by the dispenser 16 include a detergent for laundry and a fabric softener for rinsing.

The second washing tub 100 can be inserted into a space defined by the ring-shaped balancer 62 (or an approximately circular opening), and can be supported by the balancer 62 in this inserted state. The outer circumferential surface of the second washing tub 100 may be provided with concavities and convexities 114 that extend obliquely upward and downward.

The balancer 62 may have a fixing groove 62d corresponding to the unevenness 114 on the inner circumferential surface defining the central opening. The concavity and convexity 114 is inserted along the fixing groove 62d so that when the first washing tub 6 is rotated the second washing tub 100 is not loosened and rotated integrally with the first washing tub 6 .

4, the outer shape of the second washing tub 100 is divided into a first section S1, which is in contact with the inner circumferential surface of the balancer 62 (or a surface defining the central opening) And a second section S2 that is spaced apart from the inner circumferential surface of the base plate 62.

The first section S1 is located on the first axis IV-IV passing through the vertical axis O and the second section S2 is located on the second axis IV passing through the vertical axis O and perpendicular to the first axis IV- And may be positioned on the two axes Y. The first section S1 may be formed on both sides symmetrically with respect to the second axis Y and the second section S2 may be formed on both sides symmetrically with respect to the first axis IV- have.

The water discharged from the water supply section 13 is supplied to the second section of the first washing tub 6 (or the second washing tub 100) by the control of the driving section 8 by the control section, Can be supplied to the first washing tank 6 through a space formed between the inner circumferential surface of the balancer 62 and the inner circumferential surface of the balancer 62.

When the first washing tub 6 is in the second rotational position rotated from the first rotational position by a predetermined angle under the control of the driving unit 8 by the control unit, the water discharged from the water supply unit 13, (100). The second washing tub 100 may be provided with an inlet port 137 through which the water discharged from the water supplying section 13 flows and the inlet port 137 is aligned with the water supplying section 13 in the second rotating position . The inlet 137 can be disposed on both sides of the second washing tub 100 and 137 (1) and 137 (2) indicate both inlets. Preferably, May be disposed along the first axis (IV-IV) to be symmetrical.

The second rotation position may be a position where the first washing tub 6 is rotated 90 degrees from the first rotation position. As described above, since the washing motor is capable of speed control, the control unit controls the rotational angle of the first washing tub 6 or the rotational position of the first washing tub 6 based on the speed of the washing motor It is possible.

Specifically, a first hall sensor (not shown) may be provided in the reservoir cover 14, and a first magnet may be provided in the second washing tank 100. During rotation of the second washing tub 100, the first hall sensor may sense the magnetic field formed by the first magnet and send signals to the control unit based on the sensed magnetic field. The control unit can determine the rotational speed, the rotational position (or the position of the first magnet), the rotational angle, and the like of the second washing tub 100 based on the received signal, The washing motor can be controlled to be aligned with the first rotation position or the second rotation position.

Meanwhile, a second magnet may be further provided on the rotor of the washing motor, and a second hall sensor for sensing a magnetic field generated by the second magnet may be disposed in a fixed structure near the second magnet The bottom surface of the water storage tank 4). The plurality of second magnets may be disposed along the circumference of the rotor. The control unit can control the washing motor based on the signal output from the second hall sensor. At this time, by considering the signals output from the first hall sensor, the second washing bath 100 The first rotation position or the second rotation position.

Meanwhile, according to the embodiment, the rotation angle of the rotor can be sensed without a separate sensor. That is, the rotation angle of the rotor can be sensed by a sensorless sensorless method. This sensorless method can estimate the position of the rotor of the washing motor based on an output current detected while a current of a certain frequency flows to the washing motor after allowing a phase current of a predetermined frequency to flow to the washing motor. Such a sensorless system corresponds to a known technology, and a detailed description thereof will be omitted.

The second washing tub 100 may include a container 110, a first cover 120, and a second cover 130. The container 110 is filled with laundry and water. The container 110 is opened on the upper side, and the first cover 120 is coupled to the opened upper side. The first cover 120 may be engaged with the upper end of the container 110. The first cover 120 and the container 110 are each made of a synthetic resin material and are preferably connected by welding, more preferably by heat welding, but are not necessarily limited thereto.

A guide rib 126 protruding from the inner surface of the container 110 and extending in the vertical direction may be provided. The water flow generated by the rotation of the second washing tub 100 can be raised by the collision with the guide rib 126 and then dropped to the center of the container 110. [ The concave and convex portions 114 may be formed on the outer surface of the container 110. The container 110 may be made of a transparent material so that the laundry contained in the inside can be seen from the outside.

The first cover 120 is provided with an opening 121 at a substantially central portion thereof for allowing laundry to be introduced into the container 110 and provides a space in which the detergent box 140 (see FIGS. 5 to 6) . The detergent box 140 may be attached to or detached from the first cover 120. The detergent boxes 140 may be provided on both sides of the first cover 120, respectively.

When the second washing tub 100 is rotated, the water stream developed toward the outside along the radial direction due to the centrifugal force rises along the inner surface of the container 110 in the container 110. The first cover 120 may be formed with a flow path for guiding the ascended water flow to the discharge port 124. The control unit can control the speed of the second washing tub 100 (or the speed of the driving unit 8) so that water in the container 110 is discharged through the discharge port 124, And the collected water is collected in the water storage tank 4. This process may be performed when washing the laundry in the second washing tub 100 and draining the water used for washing.

Although not shown, a check valve for interrupting the flow path may be further provided, and the check valve may be configured to be opened or closed by a centrifugal force generated by rotation of the second washing tub 100, or by a water pressure .

The second cover 130 is detachably coupled to the first cover 120, and an opening 131 is formed at a substantially central portion thereof. The second cover 130 includes a water supply guide 133 for guiding the water discharged from the water supply portion 13 to the detergent box 140 (see Fig. 5). The water supply guide 133 forms an inclined surface such that the water discharged from the water supply unit 13 is guided downward and water guided along the inclined surface flows through the water supply port 141 ). The water supply guide 133 may be provided on both sides of the first cover 120, respectively. Both of the water supply guides 133 (1) and 133 (2) are preferably arranged along the first axis IV-IV so as to be symmetrical with respect to the second axis Y. [

The detergent box 140 is for containing a detergent, a bleach or a fabric softener. Water discharged from the water supply section 13 is supplied into the second washing tank 100 together with the detergent, via the detergent box 140.

The first cover 120 may be formed with a housing 128 in which the detergent box 140 is received and the detergent box 140 may be detachably coupled to the housing 128. A siphon tube 143 may be extended upward from the bottom 142 of the detergent box 140 and a siphon cover 145 covering the siphon tube 143 may be provided for smooth supply of the liquid detergent. . (See Figs. 5 to 6).

The siphon pipe 143 is connected to the bottom 142 and the upper end is opened. The siphon cover 145 has an annular cross-sectional flow path between the siphon pipe 143 and the outer peripheral surface of the siphon pipe 143 Respectively. When water is supplied and water level in the detergent box 140 gradually rises along the flow path, water flows into the siphon tube 143 through the opened upper end of the siphon tube 143, 143 to the second washing tub 100 through the lower open end of the washing tub 100. [

The detergent boxes 140 may be provided on both sides of the second cover 130, respectively. The detergent box 140 may be disposed at a position corresponding to each of the pair of inlets 137 (1) and 137 (2). The first detergent box 140 (1) may be filled with a detergent or bleach agent, and the second detergent box 140 (2) may be supplied with a fabric softener. Depending on the rotational position of the second washing tub 100, the water discharged from the water supply unit 13 can be selectively supplied to the first detergent box 140 (1) or the second detergent box 140 (2) . For example, when the washing water is supplied to the first detergent box 140 (1) during the washing cycle and the water is supplied to the second detergent box 140 (2) during the rinsing cycle, The rotational position of the motor 100 can be controlled.

The laundry processing apparatus may further include a drainage bellows 21 for draining water from the water storage tank 4 and a drain valve 22 for interrupting the drainage bellows 21. The drainage bellows 21 can be connected to the pump 24. When the drain valve 22 is opened, water can be supplied to the pump 24 through the drainage bellows 21. The water thus introduced into the pump 24 is discharged to the outside of the laundry processing apparatus through the drain pipe 25 when the pump 24 is operated.

FIG. 5 is a cross-sectional view taken along the line IV-IV in FIG. 4, showing a state in which the locking member is in the first position. 6 shows a state in which the locking member is in the second position.

The laundry processing apparatus according to an embodiment of the present invention includes a locker 150 provided in a second washing tub 100 and fixing the first washing tub 6 so as not to be detached from the first washing tub 6 while the second washing tub 100 is rotating . The locker 150 may be provided on the first cover 120.

The locker (150) includes a locking member (165) and an elastic member (161). The locking member 165 is located at a first position (see Fig. 5) in a state where the second washing tub 100 is stopped, and when the second washing tub 100 is rotated, 2 position (see FIG. 6). The locker 150 is engaged with the first washing tub 6 at the second position to fix the second washing tub 100 to the first washing tub 6. A straight line connecting the first position to the second position may cross the second section S2.

The balancer 62 may be formed with a locking groove 62c into which the locking member 165 is inserted at the second position. When the second washing tub 100 is inserted into the central portion of the ring-shaped balancer 62 and rotated at a predetermined speed or higher in a state of being aligned at a predetermined rotational position, the locking member 165 is moved to the outside along the radial direction And in this process, the locking member 165 is inserted into the locking groove 62c. The second washing tub 100 is prevented from being detached because the locking member 165 and the locking groove 62c are engaged with each other even if the second washing tub 100 is shaken or vibrated during rotation, 100 are prevented from moving upward, there is no problem that the second washing tub 100 impacts the door. Even when the second washing tub 100 is rotated at a high speed (for example, a dewatering stroke), it is possible to prevent breakage of the apparatus and prevent a safety accident.

Particularly, since the locking of the second washing tub 100 is not performed by a separate power mechanism (for example, a motor) but by centrifugal force caused by the rotation of the second washing tub 100, There is an advantage that it is not necessary to take special control for the lock as well as the advantage that it is possible to easily configure the structure for the lock.

The elastic member 161 is elastically deformed when the locking member 165 is in the second position and then is restored to its original position when the rotation of the second washing tub 100 is stopped to return the locking member 165 to the first position Return. When the rotation of the second washing tub 100 is stopped, the locking member 165 is returned to the first position by the restoring force of the elastic member 161, whereby the lock is automatically released. When the washing is completed, the lock is automatically released, so that the user can easily lift the second washing tub 100 without having to perform any other operation for releasing the lock.

The second washing tub 100 may be provided with a guide groove 127 for guiding the locking member 165 to move from the first position to the second position. The guide groove 127 may be formed in the first cover 120. The elastic member 161 is disposed in the guide groove 127 and has one end fixed to the first cover 120 and the other end connected to the locking member 165. The elastic member 161 may include a spring 161 that is tensioned when the locking member 165 is moved from the first position to the second position.

The locking member 165 may include a head 163 inserted into the locking groove 62c and a stem 162 elongated from the head 163. The head 163 is connected to the spring 161 and can be inserted into the support groove 129 formed in the first cover 120 after the stem 162 has passed the spring 161. [ The inner diameter of the support groove 129 is preferably formed to be slightly larger than the outer diameter of the stem 162 so that the movement of the stem 162 is permitted while the swinging motion is restrained. 5 to 7, the head 163 is shown as a spherical shape, but it is not limited thereto and may be configured in various forms.

The stem 162 is always configured to remain inserted in the support groove 129 even if the locking member 165 is located at any point between the first position and the second position, The movable member 165 can be stably supported even when moving.

Figure 7 shows another embodiment of the locker. Referring to FIG. 7, the locker 150 'according to the present embodiment is provided in any one of the first and second washing tanks 6 and 100 (in the embodiment, the second washing tank 100) 2 The washing tub 100 is fixed so as not to be detached from the first washing tub 6.

The locker 150 'includes an elastic member 161 and a locking member 165. The locking member 165 is supported by the elastic member 161 and the second washing tub 100 is located at the first position P1 while being detached from the first washing tub 6. The locking member 165 is moved in the first position by being interfered with the other one of the first and second washing tanks 6 and 100 during the process of mounting the second washing tub 100 to the first washing tub 6 P1 is moved to the second position P2 and then the second washing tub 100 is returned to the first position P1 by the elastic member 161 when the second washing tub 100 is mounted on the first washing tub 6, The second washing tub 100 is fixed to the first washing tub 6 by engaging with the other one (in the embodiment, the first washing tub 6) at the first position P1.

In the other one, a locking groove 62c into which the locking member 165 is inserted at the first position P1 may be formed. The locking groove 62c may be formed on the inner circumferential surface of the balancer 62 (i.e., the surface defining the space defined by the annular shape (i.e., the center portion of the balancer)).

On the other hand, as in the above-described embodiment, when the second washing tub 100 is rotated, the locking member 165 can be moved to the third position P3 by the centrifugal force. Here, the third position P3 is located further outward along the radial direction than the first position P1. The locking member 165 is inserted deeper into the locking groove 62c at the third position P3 so that the second washing tub 100 is more securely locked to the first washing tub 6. The elastic member 161 can be connected to the locking member 165. In this case, when the rotation of the second washing tub 100 is stopped, the extending elastic member 161 is restored to its original shape, 165 are also returned from the third position P3 to the first position P1.

Claims (11)

A water tank;
A first washing tub rotatably installed in the water storage tank to receive the first laundry and rotate about a vertical axis;
A second washing tub accommodating the second laundry, detachably coupled to the first washing tub, and rotated integrally with the first washing tub; And
And a locker provided in the second washing tub to fix the second washing tub so as not to be detached from the first washing tub while the second washing tub is rotating,
The locker includes:
The second washing tub is located at a first position while the second washing tub is stopped and is moved from the first position to the second position by centrifugal force when the second washing tub is rotated and is engaged with the first washing tub at the second position, A locking member for fixing the second washing tub to the first washing tub; And
And an elastic member that is elastically deformed when the locking member is in the second position and is restored to its original state when the rotation of the second washing tub is stopped to return the locking member to the first position. The method according to claim 1,
Wherein the first washing tub comprises:
A drum having an upper opening; And
And a ring-shaped balancer that is coupled to the upper side of the drum and compensates for eccentricity caused when the drum rotates,
Wherein the second washing tub comprises:
A ring-shaped member inserted in the space defined by the ring-shaped member, supported by the balancer,
In the balancer,
And the locking member is inserted into the locking groove at the second position. 3. The method of claim 2,
The second location
And is located radially outward from the first position. 3. The method of claim 2,
The locking groove
Wherein the balancer is provided on an inner circumferential surface of the balancer to define the space. 5. The method of claim 4,
In the second washing tub,
Wherein the guide groove is formed to guide the locking member to move from the first position toward the second position. 6. The method of claim 5,
The elastic member
And a spring that is disposed in the guide groove and has one end fixed to the second washing tub and the other end connected to the locking member to be tensioned when the locking member is moved from the first position to the second position, Processing equipment. 3. The method of claim 2,
When viewed from the top, the outer shape of the second washing tank,
A first section that is in contact with an inner circumferential surface of the balancer; and a second section that is spaced apart from an inner circumferential surface of the balancer,
Wherein the locking member comprises:
And a straight line connecting the second position from the first position intersects the second section. 8. The method of claim 7,
Wherein the first section is located on a first axis passing through the vertical axis,
Wherein the second section is located on a second axis passing through the vertical axis and perpendicular to the first axis. 9. The method of claim 8,
In the first section,
The first and second axes being symmetrically formed on both sides,
The second section may include:
And are symmetrically formed on both sides of the first axis. A water tank;
A first washing tub rotatably installed in the water storage tank to receive the first laundry and rotate about a vertical axis;
A second washing tub accommodating the second laundry, detachably coupled to the first washing tub, and rotated integrally with the first washing tub; And
And a locker provided in any one of the first washing tub and the second washing tub to fix one of the first washing tub and the second washing tub so as not to be detached from the other,
The locker includes:
Elastic member; And
Wherein the first washing tub and the second washing tub are supported by the elastic member and are located at a first position in a state where the second washing tub is detached from the first washing tub, 2 is moved from the first position to the second position due to interference with the other of the two washing tubs, and the second washing tub is returned to the first position by the elastic member when the second washing tub is installed in the first washing tub And a locking member engaging with the other one at the first position to fix the second washing tub to the first washing tub. 11. The method of claim 10,
In the other,
And the locking member has a locking groove into which the locking member is inserted at the first position.

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