KR102455740B1 - Laundry treating apparatus - Google Patents

Abstract

The laundry treatment apparatus of the present invention includes a water storage tub containing water, a first washing tub rotatably provided in the water storage tub to accommodate the first laundry, and a second laundry accommodating, and detachably coupled to the first washing tub, and a second washing tub which is rotated integrally with the first washing tub and a detachable unit for selectively coupling the second washing tub to the first washing tub or separating the second washing tub from the first washing tub.

Description

Laundry processing equipment {LAUNDRY TREATING APPARATUS}

The present invention relates to a laundry treatment apparatus, and more particularly, to a laundry treatment apparatus having a second laundry tub detachably installed in a first laundry tub.

A laundry treatment device is a device for processing laundry through various actions such as washing, dehydration and/or drying. Laundry processing equipment uses water and detergent to remove contamination from laundry (hereinafter, also referred to as “cloth”) and rotates a drum in which wet laundry is placed at high speed. There are a dryer for drying the laundry by supplying dry air into the inserted drum, and a washing machine for drying with both a drying function and a washing function.

Recently, a washing machine equipped with two washing tubs has been provided. Such a washing machine has a large capacity washing tub and a small capacity washing tub, and each washing tub is separated from each other. Such a washing machine is convenient because each washing tub can be used at the same time or at the same time according to the user's needs, and furthermore, when a small amount of washing is required, only a washing tub having a small capacity can be used, so it is very economical. However, in this conventional washing machine, since the two washing tubs are separated, the overall size of the product is inevitably increased due to the spaces accommodating the washing tubs, respectively, driving units for driving the washing tubs, and water supply for water supply There is a problem in that the price of the product also rises because two devices are required for each of the drainage devices for drainage.

In addition, when the conventional two washing tubs are provided, the auxiliary washing tub is coupled to the main washing tub and rotated together. Therefore, in the prior art, there is a problem in that it is difficult for a user to attach and detach the two washing tubs by manpower, and when an auxiliary washing tub is provided, it is very inconvenient to put laundry into the main washing tub when the door is opened.

The problem to be solved by the present invention is, first, in the case of small-capacity washing, the first washing tub is automatically coupled to the second washing tub and rotates integrally, and in the case of large-capacity washing, the laundry in which the first washing tub is separated from the second washing tub to provide processing equipment.

Second, in the case of large-capacity washing, while only the second washing tub is used, a laundry treatment apparatus in which the first washing tub is restrained by a door assembly is provided.

Third, to provide a laundry treatment apparatus that prevents 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 first washing tub are integrally rotated.

Fourth, to provide a laundry treatment device in which the second washing tub and the first washing tub are automatically locked during rotation, and the locked state is automatically released when the rotation is stopped.

The laundry treatment apparatus of the present invention includes a water storage tub containing water, a first washing tub rotatably provided in the water storage tub to accommodate the first laundry, and a second laundry accommodating, and detachably coupled to the first washing tub, and a second washing tub which is rotated integrally with the first washing tub and a detachable unit for selectively coupling the second washing tub to the first washing tub or separating the second washing tub from the first washing tub.

The detachable unit may constrain the second washing tub to the door assembly when the second washing tub is separated from the first washing tub.

The detachment unit may include a driving unit for generating a driving force, and at least two inclined cams connected to the driving unit to rotate about the vertical direction and selectively lifting or releasing the restraint of the second washing tub.

Alternatively, the detachment unit may include a driving unit for generating a driving force, and at least two rotating hooks connected to the driving unit to rotate about the horizontal direction and selectively lifting or releasing the restraint of the second washing tub. have.

In the case of a small-capacity laundry, the first washing tub is automatically coupled to the second washing tub and rotates integrally, and in the case of a large-capacity washing, the second washing tub is separated from the first washing tub. There is an advantage in that it is possible to save energy required for rotation of the second washing tub, and to save water when washing with a small capacity.

Second, in the case of large-capacity washing, since only the first washing tub is used while the second washing tub is restrained by the door assembly, there is no need for the user to manually separate the second washing tub and place it in a separate space, and during rotation of the first washing tub There is an advantage in that it is possible to prevent a collision with the second washing tub and to prevent damage to the washing tub.

Third, during large-capacity washing, the user can open the door assembly and simultaneously lift the second washing tub constrained to the door assembly, and position the hinge connecting the door assembly and the cabinet to the outside of the cabinet to rotate the door assembly. The radius can be increased, and thus the inlet of the first washing tub is completely opened without being covered by the second washing tub, so that the user can conveniently put the laundry into the first washing tub.

Fourth, there is an advantage of preventing 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 first washing tub are integrally rotated.

Fifth, since the lock is released without the user's separate operation in a state in which the operation of the laundry treatment device is finished, the user can remove the second washing tub without being aware of whether the lock is released, thereby improving the convenience of use It works.

1 is a cross-sectional perspective view of a laundry treatment apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the laundry treatment device of FIG. 1 .
3A is a cross-sectional view illustrating a state in which the locking member is in a first position in a state in which the second washing tub is installed on the balancer.
Figure 3b shows a state in which the locking member is in the second position in Figure 3a.
4 illustrates a state in which the detachable unit separates the second washing tub from the first washing tub according to an embodiment of the present invention.
5 is a diagram illustrating a state in which the detachable unit combines the second washing tub with the first washing tub according to an embodiment of the present invention.
6 is a view showing a detachable unit according to another embodiment of the present invention.
7 is a view illustrating a state in which the detachable unit separates the second washing tub from the first washing tub according to another embodiment of the present invention.
8 is a view illustrating a state in which the detachable unit combines the second washing tub with the first washing tub according to another embodiment of the present invention.
9 is a cross-sectional view of a laundry treatment device according to another embodiment of the present invention.
10 is a cross-sectional view illustrating a door assembly of the laundry treatment apparatus of FIG. 9 in an opened state.

Spatially relative terms "below", "beneath", "lower", "above", "upper", etc. It can be used to easily describe the correlation between components and other components. Spatially relative terms should be understood as terms including different orientations of components in use or operation in addition to the orientation shown in the drawings. For example, when a component shown in the drawing is turned over, a component described as “beneath” or “beneath” of another component may be placed “above” of the other component. can Accordingly, the exemplary term “below” may include both directions below and above. Components may also be oriented in other orientations, and thus spatially relative terms may be interpreted according to orientation.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, "comprises" and/or "comprising" means that a referenced component, step and/or action excludes the presence or addition of one or more other components, steps and/or actions. I never do that.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

In the drawings, the thickness or size of each component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Also, the size and area of each component do not fully reflect the actual size or area.

In addition, angles and directions mentioned in the process of describing the structure of the embodiment are based on those described in the drawings. In the description of the structure constituting the embodiment in the specification, if the reference point and the positional relationship with respect to the angle are not clearly mentioned, reference is made to the related drawings.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional perspective view of a laundry processing apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the laundry processing apparatus of FIG. A cross-sectional view showing a state in which the locking member is in the second position in FIG. 3A , FIG. 3B .

1 to 3, the laundry processor according to an embodiment of the present invention accommodates a water storage tank containing water, a first laundry tank rotatably provided in the water storage tank to accommodate the first laundry, and a second laundry, , a second washing tub that is detachably coupled to the first washing tub and rotates integrally with the first washing tub and the second washing tub is selectively coupled to the first washing tub or detached from the second washing tub includes units.

The cabinet 2 forms the exterior of the laundry treatment device, and forms a space in which the water storage tub 4, the first washing tub 6, and the second washing tub 100 are accommodated. The cabinet 2 is supported by the flat cabinet 2 base 2a, the upper surface is opened to form a four entrance and exit hole, and may include a front side, a left side, a right side, and a rear side 2d.

A door assembly is coupled to the cabinet 2 . The door assembly includes a top cover 3 that covers the four entry/exit holes of the cabinet 2 and a door 7 that opens and closes the four entry/exit holes.

The top cover 3 may have an inlet for putting in and taking out laundry (or "cloth"). The door 7 may be rotatably coupled to open and close the inlet of the top cover 3 .

The water storage tank 4 is to contain wash water, and may be suspended in the cabinet 2 by a support rod (not shown). The support rod may be provided at each of four corners of the cabinet 2 , and one end of each support rod is pivotably connected to the top cover 3 , and the other end is provided by a suspension (not shown) that cushions vibration. It is connected to the water storage tank (4).

The water storage tank 4 has an open upper surface, and the water storage tank 4 cover 14 may be provided on the opened upper surface. The cover 14 of the water storage tank 4 is formed in a ring shape with a substantially circular opening in the center, and laundry is put in through the opening.

A first washing tub 6 that accommodates laundry and rotates about a vertical axis O may be disposed in the water storage tub 4 . The vertical axis is substantially perpendicular to the ground, and may be precisely aligned on a vertical line with the ground, but is not limited thereto, and may be inclined at a predetermined angle (preferably, 5 degrees or less) with respect to the vertical line. A plurality of through holes through which water passes may be formed in the first washing tub 6 , and water may be exchanged between the first washing tub 6 and the water storage tub 4 through the through holes.

The first washing tub 6 may include a drum 61 having an open upper side, and a ring-shaped balancer 62 coupled to the upper portion of the drum 61 . The lower side of the drum 61 may be connected to the rotation shaft of the driving unit 8 by a hub 29 . A through hole may be formed in the drum 61 .

The balancer 62 compensates for the eccentricity induced when the drum 61 rotates. Annular cavities 62a and 62b may be formed inside the balancer 62 . A fluid (eg, brine) or a plurality of weights (eg, metal spheres) may be inserted into the cavities 62a and 62b. The annular cavities 62a and 62b have different diameters, but a plurality may be formed to have concentricity.

When the drum 61 is shifted to one side while being rotated, the eccentricity is corrected by moving the fluid or weight in the opposite direction to the direction in which the drum 61 is biased. The ring-type balancer 62 applied to the laundry treatment device has already been known in various forms, and further description will be omitted.

A second washing tub 100 detachable from the first washing tub 6 is provided. The second washing tub 100 accommodates 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 puts the first laundry into only the first washing tub 6 while the second washing tub 100 is rotated and opened together with the door assembly while being restrained by the door assembly, or the second washing tub 100 moves to the first In a state in which the washing tub 6 is restrained, the second laundry may be put into the second washing tub 100 .

A pulsator 9 may be rotatably provided at an inner lower portion of the first washing tub 6 . The pulsator 9 may include a plurality of radial ribs protruding upward. When the pulsator 9 is rotated, a water flow may be formed by the ribs.

A driving unit 8 providing power for rotating the first washing tub 6 and the pulsator 9 may be disposed in the cabinet 2 . The driving unit 8 may be disposed below the water storage tank 4 , and may be provided in the form of being suspended in the cabinet 2 together with the water storage tank 4 . The rotating shaft of the driving unit 8 is always coupled to the pulsator 9 , and may be coupled or disconnected from the first washing tub 6 according to a switching operation of a clutch (not shown). Accordingly, when the driving unit 8 is driven in a state in which the rotating shaft of the driving unit 8 is coupled to the first washing tub 6, the pulsator 9 and the first washing tub 6 are integrally rotated, and the rotating shaft When operating in a state separated from the first washing tub 6, only the pulsator 9 rotates while 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 motor of a direct drive method. The controller (not shown) may include a proportional-integral controller (PI controller), a proportional-integral-derivative controller (PID controller), and the like. The controller receives the output value (eg, output current) of the washing motor as an input, and controls the rotation speed (or rotation speed) of the washing motor to follow a preset target rotation speed (or target rotation speed) based on the input value can do.

The control unit may control not only the washing motor but also the overall operation of the laundry treatment device, and it will be understood that the control of the components mentioned below is performed by the control of the control unit.

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

A water supply unit (not shown) for supplying water supplied from an external water source to the first washing tub 6 and/or the second washing tub 100 may be provided. The water supply unit may selectively control the at least one water supply pipe 11 . To this end, the water supply unit may include at least one water supply valve. When at least one water supply valve is opened under the control of the controller, water is supplied to a dispenser (not shown) through the water supply pipe corresponding to the opened water supply valve.

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

The second washing tub 100 may be inserted into the input hole of the first washing tub 6 . Specifically, the second washing tub 100 may be inserted into a space (or a substantially circular opening) defined by the ring-shaped balancer 62, and may be supported by the balancer 62 in the inserted state. have. Concave-convex (not shown) extending obliquely in the vertical direction may be formed on the outer circumferential surface of the second washing tub 100 .

The balancer 62 may have a fixing groove (not shown) corresponding to the unevenness on the inner circumferential surface defining the central opening. The unevenness is inserted along the fixing groove, and thus, when the first washing tub 6 is rotated, the second washing tub 100 does not rotate in vain and can be rotated integrally with the first washing tub 6 .

The second washing tub 100 may include a container 102 and a flange 103 . The container 102 contains laundry and water, and has an upper side opening, and a receiving part 101 is defined therein. A flange 103 is coupled to the opened upper side of the container 102 .

The container 102 has a cylindrical structure in which the diameter increases as it progresses upward, so that it can be stably coupled to the input hole of the first washing tub 6 . Concavities and convexities may be formed on the outer surface of the container 102 . The container 102 may be made of a transparent material so that the laundry accommodated therein can be seen from the outside.

The flange 103 may be coupled to the top of the container 102 . The flange 103 is formed to extend outwardly from the top of the container 102 . The flange 103 may be fixed to the detachable unit 200 to be described later.

The detergent box (not shown) is for containing detergent, bleach or fabric softener, and water discharged from the water supply unit passes through the detergent box, and is supplied into the second washing tub 100 together with the detergent.

The laundry treatment apparatus may further include a drain bellows (not shown) for discharging water from the water storage tank 4 and a drain valve (not shown) for controlling the drain bellows. The drain bellows may be connected to a pump (not shown). When the drain valve is opened, water can be supplied to the pump through the drain bellows. The water introduced into the pump is discharged to the outside of the laundry treatment device through the drain pipe when the pump is operated.

The laundry treatment apparatus according to an embodiment of the present invention includes a locker 150 provided in the second washing tub 100 and fixing the locker 150 so as not to be detached from the first washing tub 6 while the second washing tub 100 is rotated. include 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 the first position (see FIG. 3A ) (P2) when the second washing tub 100 is stopped, and when the second washing tub 100 is rotated, the first position by centrifugal force to the second position (see Fig. 3b) (P1). The locker 150 engages the first washing tub 6 at the second position to fix the second washing tub 100 to the first washing tub 6 .

A locking groove 62c into which the locking member 165 is inserted at the second position may be formed in the balancer 62 . When the second washing tub 100 is inserted into the center of the ring-type balancer 62 and rotated at a predetermined speed or higher while aligned at a preset rotation position, the locking member 165 moves outward in the radial direction by centrifugal force. to reach the second position, in this process, the locking member 165 is inserted into the locking groove (62c). Even if the second washing tub 100 is shaken or vibrated during rotation, since the locking member 165 and the locking groove 62c are engaged, the removal of the second washing tub 100 is prevented, and in particular, the second washing tub 100 ( Since the upward movement of 100 is restrained, a problem in which the second washing tub 100 impacts the doors 7 and 7 does not occur. Even when the second washing tub 100 is rotated at a high speed (eg, a dehydration cycle), it is possible to prevent damage to the device and prevent a safety accident.

In particular, since the locking of the second washing tub 100 is performed not by a separate power mechanism (eg, a motor), but by centrifugal force caused by the rotation of the second washing tub 100 , There is an advantage that the structure for the lock can be simply configured, and there is an advantage that there is no need to take special control for the lock.

The elastic member 161 is elastically deformed when the locking member 165 is in the second position. When the rotation of the second washing tub 100 is stopped, the elastic member 161 is restored to its original state to return the locking member 165 to the first position. . 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, so that the lock is automatically released. Since the lock is automatically released when washing is complete, the second washing tub 100 can be easily lifted out without the user having to perform a separate operation for releasing the lock.

A guide groove 127 for guiding the locking member 165 to move from the first position toward the second position may be formed in the second washing tub 100 . The guide groove 127 may be formed in the first cover 120 . The elastic member 161 may be disposed in the guide groove 127 , one end may be fixed to the first cover 120 , and the other end may be 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 after the stem 162 passes through the spring 161 , it may be inserted into the support groove 129 formed in the first cover 120 . 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 allowed, while shaking between movements is restrained.

Even if the locking member 165 is located at any point between the first position and the second position, the stem 162 is always configured to maintain the inserted state in the support groove 129, and thereby, the locking member 165 ) can be stably supported without shaking even during movement.

Hereinafter, the detachment unit 200 will be described in detail. When the conventional two washing tubs are provided, the auxiliary washing tub is coupled to the main washing tub and rotated together. Therefore, in the prior art, there is a problem in that it is difficult for a user to attach and detach the two washing tubs by manpower, and when an auxiliary washing tub is provided, it is very inconvenient to put laundry into the main washing tub when the door 7 is opened. , when only the main washing tub is operated, it is difficult to fix the auxiliary washing tub so that it does not interfere with the rotation of the main washing tub.

To solve this problem, the detachment unit 200 selectively couples the second washing tub 100 to the first washing tub 6 or separates it from the first washing tub 6 . Specifically, when the second washing tub 100 is separated from the first washing tub 6, the detachable unit 200 binds the second washing tub 100 to the door assembly or couples it to the door assembly, and the second washing tub 100 ( When 100) is coupled to the first washing tub 6, the second washing tub 100 is separated from the door assembly.

The detachable unit 200 is coupled to the door assembly. Specifically, the detachable unit 200 may be coupled to the door 7 or the top cover 3 .

In a state in which the tea removal unit is coupled to the door assembly, the second washing tub 100 is selectively lifted or restrained by driving force. That is, the detachable unit 200 lifts and fixes the second washing tub 100 from the first washing tub 6 by driving force, or releases the second washing tub 100 to insert the first washing tub 6 in. interpolate into the hole.

Hereinafter, the configuration of the specific detachment unit 200 will be described.

4 shows a state in which the detachable unit 200 separates the second washing tub 100 from the first washing tub 6 according to an embodiment of the present invention, and FIG. The detachable unit 200 shows a state in which the second washing tub 100 is coupled to the first washing tub 6 .

4 and 5 , the detachment unit 200 according to an embodiment of the present invention includes a driving motor (not shown) and an inclined cam 202 .

The driving motor generates driving force. The driving motor may be configured as a motor, and may be coupled to the door assembly.

The inclined cam 202 is connected to the driving motor to rotate in the vertical direction as the axis 201 , and selectively lifts or releases the restraint of the second washing tub 100 . At least two inclined cams 202 may be disposed to face each other around the second washing tub 100 .

The inclined cam 202 may have an asymmetrical conical shape about an axis. Specifically, one radius about the axis may have a conical shape, and the other radius may have a cylindrical shape.

The inclined cam 202 is formed asymmetrically about its axis, and is in contact with the contact releasing region 202a (cylindrical shape) in which the contact with the second washing tub 100 is released on one side and the second washing tub 100 on the other side. A region 202b (conical shape) is formed. The inclined cam 202 has a shape in which the width of the contact area 202b decreases as it progresses from the bottom to the top.

Accordingly, when the inclined cam 202 rotates about its axis, the second washing tub 100 is lifted and separated from the first washing tub 6 (refer to FIG. 4 ), or the second washing tub 100 is lowered and the first washing tub 100 is lifted. It is coupled to the washing tub 6 (see FIG. 5).

Therefore, in the case of large-capacity washing, while only the first washing tub 6 is used, the second washing tub 100 is restrained by the door assembly, so it is necessary for the user to manually separate the second washing tub 100 and place it in a separate space. There is an advantage in that it is possible to prevent a collision with the second washing tub 100 during rotation of the first washing tub 6 and to prevent damage to the washing tub.

In addition, during large-capacity washing, the user may open the door assembly and simultaneously lift the second washing tub 100 constrained to the door assembly.

Hereinafter, the detachment unit 200 according to another embodiment will be described in detail.

6 is a view showing a detachable unit 200A according to another embodiment of the present invention, and FIG. 7 is a view showing a detachable unit 200A according to another embodiment of the present invention to connect the second washing tub 100 to the first washing tub 6 ), and FIG. 8 shows a state in which the detachable unit 200A according to another embodiment of the present invention couples the second washing tub 100 to the first washing tub 6 .

6 to 8 , the detachment unit 200A includes a driving motor (not shown) that generates a driving force, and is connected to the driving motor to rotate in a horizontal direction as an axis 203, and optionally a second washing tub ( 100) includes at least two rotating hooks 204 for lifting or releasing restraints.

When the rotary hook 204 is rotated, the second washing tub 100 is lifted and separated from the first washing tub 6 (see FIG. 7 ), or the second washing tub 100 is lowered and coupled to the first washing tub 6 . (see FIG. 8).

The rotating hook 204 is rotatably provided in the door assembly.

Hereinafter, when the first washing tub 6 is used, the present invention for completely opening the input hole of the first washing tub 6 without completely separating the second washing tub 100 from the laundry treatment device and placing it in a separate space A laundry treatment device according to another embodiment will be described.

9 is a cross-sectional view of a laundry treatment apparatus according to another embodiment of the present invention, and FIG. 10 is a cross-sectional view illustrating an opened state of the door assembly of the laundry treatment apparatus of FIG. 9 .

9 and 10 , the laundry treatment apparatus of this embodiment further includes a hinge 301 for rotatably coupling the cabinet 2 and the door assembly, and the hinge 301 includes the cabinet 2 and the door assembly. It is arranged in an outer area that does not overlap in the vertical direction.

Specifically, the axis of the hinge 301 is parallel to the rear surface 2d of the cabinet 2 and is parallel to the horizontal direction, and the axis of the hinge 301 is spaced apart from the rear surface of the cabinet 2 to the rear.

Also, it may include a first connecting member 302 connecting the door assembly and the hinge 301 and a second connecting member 303 connecting the hinge 301 and the cabinet 2 .

In addition, a damper 310 that provides a cushioning force when the door assembly is rotated may be further included.

Accordingly, the rotation radius of the door assembly is increased, so that when the door assembly is opened, it is restrained by the door assembly so that the second washing tub 100 completely opens the input hole of the first washing tub 6 .

It is convenient for the user to put laundry into the first washing tub 6 , and there is no need to store the second washing tub 100 in a separate space.

Claims (12)

water reservoir;
a first washing tub rotatably provided in the water storage tub to accommodate a first laundry;
a second washing tub accommodating a second laundry, detachably coupled to the first washing tub, and rotating integrally with the first washing tub; and
and a detachable unit for selectively coupling the second washing tub to the first washing tub or separating the second washing tub from the first washing tub;
The detachment unit is
a driving motor for generating driving force; and
and at least two inclined cams connected to the driving motor to rotate about the vertical direction and selectively lift or release the restraint of the second washing tub. The method of claim 1,
a cabinet accommodating the water storage tub, the first washing tub, and the second washing tub, and having a cloth entry hole through which the cloth enters and exits;
Further comprising a door assembly including a top cover for covering the four entry and exit holes of the cabinet and a door for opening and closing the four entry and exit holes,
The detachable unit may be configured to bind the second washing tub to the door assembly when the second washing tub is separated from the first washing tub. 3. The method of claim 2,
The detachable unit is a laundry treatment device coupled to the door assembly. delete The method of claim 1,
The inclined cam is formed asymmetrically about an axis, and has a contact release area on one side of which contact with the second washing tub is released. The method of claim 1,
The detachment unit is
a driving motor for generating driving force; and
and at least two rotary hooks connected to the driving motor to rotate about a horizontal direction and selectively lift or release the restraint of the second washing tub. 3. The method of claim 2,
Further comprising a hinge rotatably coupling the cabinet and the door assembly,
The hinge is disposed in an external area that does not overlap the cabinet and the door assembly in a vertical direction. 8. The method of claim 7,
The laundry treatment machine further comprising a damper that provides a cushioning force when the door assembly is rotated. The method of claim 1,
The rotation shaft of the first washing tub is disposed in a vertical direction,
The second washing tub is a laundry treatment device whose diameter is expanded as it progresses upward. The method of claim 1,
and a locker provided in the second washing tub to fix the locker so as not to be detached from the first washing tub while the second washing tub is rotated. 11. The method of claim 10,
The locker is fastened to the first washing tub by the centrifugal force of the second washing tub, and when the second washing tub is not rotated, the locker is disconnected from the first washing tub by the elastic restoring force. The method of claim 1,
The first washing tub,
a drum with an open upper side; and
It is coupled to the upper side of the drum, comprising a ring-type balancer for compensating for eccentricity caused when the drum rotates,
The second washing tub,
A laundry treatment device inserted into a space defined by the ring shape and supported by the balancer.

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