KR101868349B1 - A washing machine - Google Patents

Abstract

A washing machine of the present invention comprises: a body forming an outer appearance; A tub disposed inside the main body; A main drum rotatably mounted in the tub and receiving an object to be washed therein; A sub drum mounted inside the main drum to be rotatable relative to the main drum; And an inner rotor connected to the sub drum and rotated at the outer side of the stator and an inner rotor connected to the main drum and rotated inside the stator, A plurality of main drum lifters protruding radially inward are provided and a plurality of sub drum lifters protruding radially inward are provided on the inner circumferential surface of the sub drum.

Description

{A WASHING MACHINE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a washing machine for improving the washing performance by generating a three-dimensional flow so that both circumferential and axial flow of the laundry can be performed inside the drum.

Generally, in a washing machine, a washing object in a drum is forcibly flowed by using a mechanical force such as a friction between a rotating drum and laundry to receive a driving force of a driving motor in a state in which detergent, washing water and washing object are put in the drum. So that the laundry is subjected to a physical action such as friction or impact so that the laundry is washed. Further, the detergent is brought into contact with the object to be cleaned so that the object is washed by a chemical action. Further, the chemical action of the detergent is promoted by the flow of the laundry in the drum.

In recent years, a rotary drum of a drum type washing machine is formed in a horizontal direction. Of course, the rotational axis of the drum may be given a predetermined angle with respect to the horizontal direction. The drum washing machine in which the rotating shaft is in the horizontal direction causes the laundry to flow in the circumferential direction along the inner peripheral surface of the drum.

The object to be laundered flows along the inner circumferential surface of the drum due to the friction between the inner circumferential surface and the centrifugal force caused by the rotation of the drum. A lifter for assisting the flow of the laundry may be provided on the inner circumferential surface of the drum. Here, depending on the rotational speed of the drum, the object to be cleaned may be circularly moved along the inner circumferential surface, or may be dropped by gravity at the upper portion of the drum. Such a falling motion is a factor that greatly influences the washing effect.

The flow of the laundry within the drum greatly affects the washing effect. In detail, the various flows of the laundry subject to the laundry vary the contact surface of the laundry to be rubbed against the inner circumferential surface of the drum so that the laundry can be evenly washed. In addition, the physical force acting on the laundry object is increased to increase the washing effect.

In the above-described conventional drum type washing machine, a single drum rotates to flow laundry. Accordingly, the laundry is only allowed to flow in the circumferential direction of the drum along the inner circumferential surface of the drum at the initial position, and complicated flow such as axial flow and rotational flow can not be achieved. That is, the object to be laundered is only a planar flow. This is because there is no room for additional external force to generate a complicated flow of the object to be cleaned. As a result, the flow of the washing object is limited, and the washing effect is limited. Further, the washing time is increased and the power consumption is increased.

It is another object of the present invention to provide a washing machine having a structure capable of exerting an external force so that the flow of a laundry subject to movement within a drum of the washing machine can be varied.

 In particular, it is an object of the present invention to provide a washing machine having a structure in which two drums and a driving motor capable of independently driving the two drums are provided to allow three-dimensional flow to the laundry object.

Another object of the present invention is to provide a washing machine having a structure in which the three-dimensional flow of laundry is efficiently performed, and the washing performance is efficiently improved.

SUMMARY OF THE INVENTION The present invention provides the following configuration to solve the above-described technical problems.

One embodiment of the washing machine of the present invention comprises: a body forming an outer appearance; A tub disposed inside the main body; A main drum rotatably mounted in the tub and receiving an object to be washed therein; A sub drum mounted inside the main drum to be rotatable relative to the main drum; And an inner rotor connected to the sub drum and rotated at the outer side of the stator and an inner rotor connected to the main drum and rotated inside the stator, A plurality of main drum lifters protruding radially inward are provided and a plurality of sub drum lifters protruding radially inward are provided on the inner circumferential surface of the sub drum.

More specifically, the inner circumferential surface of the main drum is divided into a first surface that is not opposed to the outer circumferential surface of the sub drum, and a second surface that opposes the sub drum outer circumferential surface, and the main drum lifter is provided on the first surface .

According to the above-described aspect of the present invention, the main drum and the sub drum are independently driven by the driving motor to cause rotation of the laundry by the difference in relative rotation speed between the drums, so that the laundry is rotated inside the drum, . In addition, a plurality of lifters are provided on the inner circumferential surface of the drum, so that the three-dimensional flow of the laundry object inside the drum can be smoothly performed.

The axial length ratio between the main drum lifter and the sub drum lifter may be proportional to the ratio of the length of the first surface of the main drum inner surface to the length of the inner surface of the sub drum. Which are provided with a lifter corresponding to the main drum and the sub drum, respectively, which have relatively different axial lengths.

The main drum lifter and the sub drum lifter are provided inside the drum in parallel with the axial direction. However, the present invention is not limited to this, and the main drum lifter and the sub drum lifter may be provided so as to have a predetermined angle with respect to the axial direction. In this case, the rotational direction of the main drum is determined according to the direction of the angle of the main drum lifter with respect to the axial direction, and the sub drum is rotated in the direction of the angle of the sub drum lifter with respect to the axial direction do. That is, the rotation direction of the drum and the inclination direction of the lifter are matched so that the three-dimensional flow of the laundry object inside the drum can be smoothly performed by the lifter.

The height of the main drum lifter in the radial direction decreases toward the rear side along the axial direction, and the height of the sub drum lifter in the radial direction decreases along the axial direction toward the front side. This is to assist the lifter to impart three-dimensional flow by inclining the lifter in the axial direction so that the object to be washed in the drum can efficiently flow in the axial direction.

In this case, the main drum lifter or the sub drum lifter may have a linear inclination along the axial direction, and the main drum lifter or the sub drum lifter may have a curved inclination along the axial direction.

Further, the main drum lifter extends rearward from the front end side of the main drum. Further, the sub drum lifter extends forward from the rear end side of the sub drum. Further, the main drum lifter and the sub drum lifter have a slope which is lowered in mutually opposing directions. This is to prevent the object to be washed from being pushed to the inside or outside of the drum by the axial flow of the object to be laundered, and to allow the object to be laid to be positioned at the center of the drum in order to smooth the three-

Meanwhile, the main drum and the sub drum are independently driven by the driving motor. The main drum and the sub drum rotate relative to each other to rotate the laundry in the axial direction.

The object to be washed is moved in the circumferential direction by the rotation of the main drum or the sub-drum, and is rotated by the relative motion between the main and sub-drums to flow in the axial direction.

In this case, the main drum lifter and the sub drum lifter may guide the circumferential flow of the laundry. In addition, mutually opposing slopes of the main drum lifter and the sub drum lifter can guide the axial flow of the laundry.

The present invention utilizes two independently driven drums so that the flow of laundry objects moving in the drum of the washing machine can be varied in three dimensions. Accordingly, the three-dimensional flow of the laundry can be performed, thereby improving the washing performance of the washing machine and reducing the washing time.

Further, according to the present invention, since lifters are provided in each drum in accordance with two independently driven drums, the three-dimensional flow of the laundry is more smoothly performed, thereby improving the washing performance of the washing machine and reducing the washing time .

1 is a schematic view of a washing machine according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the main drum, the sub-drum, and the like of FIG. 1; FIG.
3 is a schematic view showing the connection of the drive motor to the main drum and the sub-drum.
4 is a schematic view of a washing machine showing an example in which the rotational axis of the drum is inclined and the lifter is inclined according to another embodiment of the present invention.
5 is a perspective view showing examples of a main drum lifter;
6 is a perspective view showing examples of sub drum lifters;
7 is a schematic view showing the flow of a laundry object inside the washing machine according to the present invention.
FIG. 8 is a schematic view showing the flow of a laundry object at point C in FIG. 7; FIG.

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

1 is a schematic view of a washing machine according to an embodiment of the present invention. Referring to FIG. 1, a washing machine according to an embodiment of the present invention includes a cabinet 10 constituting an outer shape of a device corresponding to the main body. In the front of the cabinet 10, a charging port 20 for charging laundry, which is an object to be cleaned, into the cabinet 10 is formed.

 The inlet 20 is opened and closed by a door rotatably fixed to the cabinet. A control panel 30 having various operation buttons for operating the washing machine is located above the cabinet, and a detergent supply device (not shown) is provided at one side of the control panel 30 to insert detergent or the like .

The main tub 50 is rotatably installed in the tub and the main drum 50 and the sub drum 60 are installed in the cabinet 10, . And a driving motor 70 for driving the main and sub drums is provided at a rear portion of the tub.

The tub 40 has a cylindrical configuration and can house the main drum 50 and the sub drum 60 therein. The front surface of the tub 40 is opened to be connected to the open inlet 20 of the cabinet described above. Therefore, a gasket surrounding the front portion of the tub and the vicinity of the inlet of the cabinet is provided between the front portion of the tub and the inlet of the cabinet. This is to prevent the washing water contained in the tub from flowing into the cabinet.

The main drum 50 is a cylindrical structure rotatably mounted in the tub. A plurality of through holes may be formed in the side surface of the main drum 50 to allow the washing water to escape.

The sub-drum 60 is of a cylindrical configuration rotatably mounted in the main drum 50. Here, the sub-drum 60 is mounted to be rotatable relative to the main drum. That is, the main drum and the sub drum can be driven independently of each other, and various relative rotations can be performed according to the rotational speed and the rotational direction of the respective drums.

The driving motor 70 is a device for generating a driving force for driving the main drum and the sub drum, and is mounted on the rear surface of the tub 40. The driving motor 70 includes a fixed stator 71, an outer rotor 72 rotated on the outer side of the stator, and an inner rotor 73 rotated on the inner side of the stator. A drive motor having these two rotors may be referred to as a dual-rotor motor for convenience's sake.

The stator 71 has an annular structure to surround the inner rotor 73 and is fixed to the turbine side. The stator has an inner winding portion and an outer winding portion on a core in which an iron core is laminated.

3 schematically shows a structure in which a driving motor can transmit a driving force to a main drum and a sub drum. Referring to FIG. 3, the inner rotor 73 is rotatably disposed inside the stator and is connected to an outer shaft 81 to be described later and is engaged with rotation of the main drum 50. The outer rotor 72 is rotatably provided on the outer side of the stator and is connected to an inner shaft 82 to be described later and is engaged with rotation of the sub drum 60. The inner rotor and the outer rotor include a magnet, and when an electric current is applied to the inner and outer winding portions of the drive motor, the inner rotor and the outer rotor rotate due to a magnetic field generated by the flowing current.

When the currents of the inner and outer winding portions of the drive motor 70 are respectively controlled, the inner rotor and the outer rotor rotate independently of each other. Accordingly, as shown in FIG. 3, the main drum 50 and the sub-drum 60 can rotate independently of each other by a single drive motor 70. That is, the driving motor independently drives the main drum and the sub drum. According to the above-described aspect of the present invention, the main drum and the sub drum are independently driven by the driving motor to cause rotation of the laundry by the difference in relative rotation speed between the drums, so that the laundry is rotated inside the drum, .

The outer shaft 81 penetrates through the tub 40 and connects the inner rotor 73 to the main drum 50. The outer shaft 81 corresponds to a hollow shaft, and the inner shaft 82 is mounted inside the outer shaft 81. The inner shaft 82 penetrates the inside of the outer shaft and connects the outer rotor 72 and the sub-drum 60.

In FIG. 1, the main drum 50 and the outer shaft 81 are connected by a main drum spider 91. The main drum 50 is open at the front and rear. The main drum spider 91 is coupled to the outer shaft 81 and is fixedly coupled to the main drum 50.

The sub drum 60 and the inner shaft 82 are connected by the sub drum spider 95. The sub drum 60 has a sub drum bag forming a rear surface, the front side being open and the rear side being closed by the sub drum bag. The sub drum spider 95 is fixed in close contact with the sub drum bag.

Referring to FIG. 3, the outer shaft and the inner shaft are rotatable independently of each other with a bearing interposed therebetween, and the outer rotor and the inner rotor are also rotatable independently of each other with the stator interposed therebetween. The stator includes separate windings on the outer rotor side and the inner rotor side, and the drive motor can independently drive the outer rotor and the inner rotor. Therefore, since the main drum is driven by the inner rotor and the sub drum is driven by the outer rotor, the main drum and the sub drum can be independently driven by the driving motor. In addition, the main drum and the sub drum may be relatively rotated by independent driving of the outer rotor and the inner rotor. That is, various relative rotations can be generated by changing the direction of rotation or giving different speeds to the same direction of rotation.

The inner circumferential surface of the main drum and the inner circumferential surface of the sub drum have different lengths in the axial direction, and the outer circumferential surface of the sub drum is opposed to a part of the inner circumferential surface of the main drum. 3 schematically shows a main drum and a sub-drum having such a structure. Referring to FIG. 3, the sub-drum has a smaller axial length than the main drum. Here, the sub-drum is mounted inside the main drum so as to extend along the axial direction from one end of the main drum. The main drum has a structure in which only a part 50b of the inner peripheral surfaces 50a and 50b is opposed to the outer peripheral surface of the sub drum.

As described above, the structure provides a structure in which the object to be cleaned can be brought into contact with the interface between the sub-drum and the main drum. 7 shows only the first surface 50a of the main drum and the inner circumferential surface 60a of the sub-drum to which the laundry can be contacted, and shows the flow of the laundry in the drum. 8 is an enlarged view of a boundary line C between the first surface 50a of the main drum and the inner circumferential surface 60a of the sub-drum.

The laundry is rotated in one direction due to the difference in rotational speed between the drums. In Fig. 7, the main drum rotates counterclockwise, and the sub-drum rotates clockwise. In this case, it is preferable that the absolute value of the rotational speed of the sub-drum is larger than the absolute value of the rotational speed of the main drum. If the absolute values of the rotational speeds of the sub-drum and the main drum are the same, the object to be washed only rotates at the boundary line C between the main and sub-drums. Therefore, it is preferable to vary the rotation speed of the drums in order to allow three-dimensional flow of the object to be washed, so that a large rotational force acts in one direction.

8 shows the flow of the laundry in the vicinity of the boundary line C of the drums when the rotational speed of the sub-drum is greater than the rotational speed of the main drum, as described above. At this time, the rotational flow of the laundry is rotated in the clockwise direction (D) about the rotational axis (Z) in the vertical direction when viewed from the inner peripheral surface of the drum.

Further, a circumferential flow (E) of the drum is formed by friction with the inner peripheral surface of the drum. Accordingly, the object to be cleaned is rotated in the circumferential direction of the drum and is rotated about a rotational axis perpendicular to the inner circumferential surface of the drum, so that an axial flow F is generated from the side of the drum 60 having a high rotation speed to the side of the slow drum 50 do.

The axial flow (F) of the laundry is generated by relative rotation of the main drum and the sub drum. More specifically, the laundry is caused to flow in the axial direction by the relative movement between the first surface 50a of the inner circumferential surface of the main drum and the inner circumferential surface 60a of the sub-drum.

From the viewpoint of the object to be laundered, the object to be laid flows in the circumferential direction by the rotation of the main drum or the sub-drum, and flows in the axial direction by the relative movement of the main and sub-drums. Here, the axial flow of the object to be cleaned is achieved by the rotation of the object to be cleaned by the relative motion between the main drum and the sub-drum. More specifically, the axial flow F is caused by the rotation of the object to be cleaned about the rotation axis Z perpendicular to the inner peripheral surface of the drum of the object to be cleaned. Accordingly, in addition to the circumferential flow (E) of the planar drum, the object to be laundered becomes an axial flow (F) of the drum to enable a three-dimensional flow.

In Fig. 7, the arrows inside the drum schematically show the flow of the laundry to be subjected to such steric flow. Referring to FIG. 7, the object to be cleaned is schematically shown as a twisted strip-like flow. This is the type of flow seen because the object to be washed rotates and simultaneously shows the flow falling by the circumferential flow and gravity.

The washing machine of this embodiment shown in FIG. 1 has a structure in which the rotation axis of the drum is arranged in a horizontal direction. However, the present invention is not limited to this, and the drum may be configured such that the rotational axis of the drum is inclined at a predetermined angle with respect to the horizontal direction. Fig. 4 shows an embodiment of such a structure in which the rotation axis is inclined. In this case, the flow of the object to be cleaned by the rotation of the main drum and the sub-drum is further diversified. That is, when the laundry object which flows in the circumferential direction along the inner circumferential surface of the main drum or the sub drum is dropped by the gravity at the upper portion of the drum, the laundry falls down to a position different from the flow path of the conventional circumferential laundry object So that the axial flow can be made by gravity, which makes it possible to flow the laundry more efficiently.

The aspect of the above-described construction is that the main drum and the sub drum are independently driven by the drive motor to cause the object to be rotated to rotate due to the difference in relative rotational speed between the drums, So that a three-dimensional flow occurs.

In addition, the sub-drum is shorter in axial length than the main drum, so that the object to be laundered can be brought into contact with the interface between the sub-drum and the main drum, whereby the object to be laundered is rotated by the difference in rotational speed between the drums A rotating flow is generated and a three-dimensional flow is possible. According to this, since the three-dimensional flow can be performed on the laundry, the washing performance of the washing machine can be improved and the washing time can be reduced.

1, a plurality of main drum lifters 101 protruding radially inward are provided on the inner circumferential surface of the main drum. On the inner circumferential surface 60a of the sub drum, a plurality of A sub-drum lifter 102 is provided.

The inner circumferential surface of the main drum may be divided into a first surface 50a which is not opposed to the outer circumferential surface of the sub drum, and a second surface 50b which is opposite to the outer circumferential surface of the sub drum. The main drum lifter 101 is provided on the first surface 50a.

The main drum lifters 101 may be arranged at regular intervals along the inner circumferential surface of the main drum. In addition, the sub drum lifters 102 may be disposed at regular intervals along the inner circumferential surface of the sub drum.

The side surface of the above-described structure is provided with a plurality of lifters on the inner circumferential surface of the drum so that the three-dimensional flow of the laundry object inside the drum can be smoothly performed.

The axial length ratio between the main drum lifter 101 and the sub drum lifter 102 may be proportional to the length of the first surface 50a of the inner circumferential surface of the main drum and the length of the sub drum inner circumferential surface 60a . 2, the axial length of the main drum lifter 101 is l1, the axial length of the sub drum lifter 102 is l2, the length of the first surface 50a of the inner circumferential surface of the main drum is d1 , And the length of the inner circumferential surface 60a of the sub drum is d2. In this case, the ratio of l1: 12 can be configured to be proportional to the ratio of d1: d2. The lifter includes lifters corresponding to the main drums and the sub drums having different axial lengths, so that the lifters can efficiently contact the laundry.

In FIG. 2, the main drum lifter 101 and the sub drum lifter 102 are provided inside the drum in parallel with the axial direction. However, the present invention is not limited to this, and the main drum lifter and the sub drum lifter may be provided so as to have a predetermined angle with respect to the axial direction.

4 shows an example in which the main drum lifter and the sub drum lifter are provided so as to have a predetermined angle with respect to the axial direction. Referring to FIG. 4, the main drum lifter and the sub drum lifter form a slope at a predetermined angle? From the axial direction.

In this case, the rotational direction of the main drum is determined according to the direction of the angle of the main drum lifter with respect to the axial direction, and the sub drum is rotated in the direction of the angle of the sub drum lifter with respect to the axial direction do. That is, the rotation direction of the drum and the inclination direction of the lifter are matched so that the three-dimensional flow of the laundry object inside the drum can be smoothly performed by the lifter. 4, the main drum 50 is rotated in a clockwise direction, and the sub drum 60 is rotated in a counterclockwise direction when viewed from the inlet of the washing machine. However, the present invention is not limited to the example shown in Fig. 4, but may be changed by adjusting the inclination direction of the lifter. The side surface of the above configuration allows the laundry to be axially flowed toward the center of the drum when the drum is rotated, thereby helping the laundry to flow in a three-dimensional manner.

1 and 2, the main drum lifter 101 extends rearward from the front end side of the main drum, and the sub drum lifter 102 extends forward from the rear end side of the sub drum. Further, the main drum lifter and the sub drum lifter have a slope which is lowered in mutually opposing directions.

This is to prevent the object to be washed from being pushed to the inside or outside of the drum by the axial flow of the object to be laundered, and to allow the object to be laid to be positioned at the center of the drum in order to smooth the three-

Fig. 5 shows examples of the main drum lifter 101. Fig. The lifter of Fig. 5 (a) is longer than the lifter of Fig. 5 (b) in the axial direction. This is because, in the case of the washing machine to which the lifter of Fig. 5 (a) is applied, compared to the washing machine to which the lifter of Fig. 5 (b) Since the ratio of the axial length of the first surface 50a is larger, the longer lifter is used.

The height of the main drum lifter 101 in the radial direction decreases toward the rear side of the main drum along the axial direction. 5, the height of the main drum lifters 101 decreases from the front side 51 to the rear side 52 of the main drum as viewed from the inlet side of the washing machine.

Fig. 6 shows examples of the sub drum lifter 102. Fig. The length of the sub drum lifter 102 may be varied in accordance with the ratio of the axial length of the inner surface 60a of the sub drum to the axial length of the first surface 50a of the inner circumferential surface of the main drum, have. In addition, the height of the sub-drum lifter 102 in the radial direction decreases along the axial direction toward the front side of the sub-drum. 6, the height of the sub drum lifters 102 decreases from the rear side 62 to the front side 61 of the sub drum as viewed from the inlet side of the washing machine.

This is to assist the lifter to impart three-dimensional flow by inclining the lifter in the axial direction so that the object to be washed in the drum can efficiently flow in the axial direction.

Meanwhile, the main drum lifter 101 or the sub drum lifter 102 may have a linear slope or a curved slope along the axial direction. FIG. 6 shows an example in which such a slope is applied to the sub-drum lifters. 6A shows an example in which a linear gradient A is applied, and FIG. 6B shows an example in which a curved gradient B is applied. The various types of inclination of the lifter are designed to facilitate the three-dimensional flow by allowing the washing object in the drum to efficiently flow in the axial direction.

Functionally, the main drum lifter 101 and the sub drum lifter 102 can guide the circumferential flow of the laundry. This is because the lifter is projected radially on the inner circumferential surface of the drum, so that the laundry can be forced to flow in the circumferential direction of the drum by the rotation of the drum.

In addition, mutually opposing slopes of the main drum lifter and the sub drum lifter can guide the axial flow of the laundry. This is because, as described above, the lifter is inclined in the axial direction so that the object to be washed in the drum can efficiently flow in the axial direction to assist the three-dimensional flow.

Referring to FIG. 3, the inner circumferential surface of the main drum may be provided with a drum guide 55 for sealing the outer circumferential surface of the sub drum. This is to prevent the object to be laundered between the drums.

While the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it is to be understood that the scope of the present invention should not be construed as being limited to the embodiments and / or drawings, do. It is to be expressly understood that improvements, changes and modifications apparent to those skilled in the art are also within the scope of the present invention.

10: main body (cabinet) 20: inlet
30: Control panel 40:
50: main drum 60: sub drum
70: drive motor 71:
72: outer rotor 73: inner rotor
81: outer shaft 82: inner shaft
91: Main Drum Spider 95: Sub Drum Spider
101, 102: Lifter

Claims (23)

A body forming an outer appearance;
A tub disposed inside the main body;
A main drum rotatably mounted in the tub and receiving an object to be washed therein;
A sub drum mounted inside the main drum to be rotatable relative to the main drum; And
An outer rotor connected to the sub drum and having a first magnet corresponding to the first winding section and rotated on the outer side of the stator, a second rotor connected to the main drum, And a driving motor including an inner rotor having a second magnet corresponding to the winding portion and rotated inside the stator,
A plurality of main drum lifters protruding radially inward are provided on an inner circumferential surface of the main drum,
A plurality of sub-drum lifters protruding radially inward are provided on an inner peripheral surface of the sub-drum,
Wherein the main drum and the sub drum are independently rotated according to control of currents applied to the first and second winding portions, respectively,
Wherein the main drum lifter is configured such that a height in a radial direction of the main drum is lowered toward the rear side along the axial direction and a height of the sub drum lifter in the radial direction is decreased along the axial direction toward the front side, The washing machine being characterized in that the washing machine comprises:
An outer shaft for rotating the main drum; an inner shaft provided in the outer shaft for rotating the sub drum;
A main drum spider for connecting the main drum to the outer shaft and transmitting the driving force of the driving motor to the main drum, and a sub drum for transmitting driving force of the driving motor to the sub drum by connecting the sub drum to the inner shaft. Sub drum spider for; And
Wherein the sub drum further comprises a sub drum bag forming a rear surface,
Wherein the sub drum spider is located in a receiving portion recessed inwardly of the sub drum bag and is coupled to the sub drum bag and positioned between the sub drum bag and the main drum spider.
The method according to claim 1,
The inner circumferential surface of the main drum is divided into a first surface which is not opposed to the outer circumferential surface of the sub drum, and a second surface which opposes the sub drum outer circumferential surface,
And the main drum lifter is provided on the first surface.
3. The method of claim 2,
Wherein the axial length ratio of the main drum lifter to the sub drum lifter is proportional to the length ratio of the first surface of the main drum inner surface to the inner circumferential surface of the sub drum.
The method according to claim 1,
And the main drum lifter is provided in parallel with the axial direction.
The method according to claim 1,
Wherein the main drum lifter has a predetermined angle with respect to the axial direction.
The method according to claim 4 or 5,
And the sub drum lifter is provided in parallel with the axial direction.
The method according to claim 4 or 5,
Wherein the sub drum lifter is provided to have a predetermined angle with the axial direction.
6. The method of claim 5,
Wherein the rotational direction of the main drum is determined in accordance with a direction of an angle of the main drum lifter with respect to the axial direction.
8. The method of claim 7,
Wherein the rotating direction of the sub drum is determined according to a direction of an angle of the sub drum lifter with respect to the axial direction.
delete delete The method according to claim 1,
Wherein the main drum lifter or the sub drum lifter has a linear inclination along the axial direction.
The method according to claim 1,
Wherein the main drum lifter or the sub drum lifter has a curved inclination along the axial direction.
The method according to claim 1,
Wherein the main drum lifter and the sub drum lifter have a slope lowered in mutually opposite directions.
delete The method according to claim 1,
Wherein the main drum and the sub drum rotate in the axial direction by rotating relative to each other by relative rotation of the main drum and the sub drum. 17. The method of claim 16,
Wherein the laundry is rotated in the circumferential direction by rotation of the main drum or the sub drum and is rotated in the axial direction by the relative movement of the main drum and the sub drum.
18. The method of claim 17,
Wherein the main drum lifter and the sub drum lifter guide the circumferential flow of the laundry.
19. The method of claim 18,
Wherein the mutually opposing inclination of the main drum lifter and the sub drum lifter guides the axial flow of the laundry object.
The method according to claim 1,
Wherein the main drum lifter extends rearward from a front end side of the main drum.
The method according to claim 1,
And the sub drum lifter extends forward from the rear end side of the sub drum.
delete delete

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