KR101699752B1 - Apparatus for treating laundry - Google Patents

Abstract

A laundry processing apparatus according to an embodiment of the present invention includes a drum rotatably formed in a cross section of a non-circular closed curve having a constant distance from a center of rotation, the drum being rotatable about a front or rear side of the drum, And a reinforcing member provided at a front edge or rear edge of the drum.
According to another aspect of the present invention, there is provided a drum assembly including a metal panel having a welded portion formed by welding one side edge and the other edge, a metal panel having a closed end surface, and a flange formed on a front or rear edge of the welded portion, And a reinforcing member for preventing the reinforcing member.

Description

Apparatus for treating laundry

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 in which a space for accommodating laundry is maximized.

The laundry processing apparatus refers to all the apparatuses for managing or treating clothes, bedding, etc. (hereinafter, referred to as 'laundry') such as washing, drying and creasing of laundry in the home or in a laundry.

The laundry processing apparatus is a washing machine for separating contaminants adhered to laundry by using physical action such as chemical decomposition of water and detergent and friction between water and laundry, a dryer for dehydrating and drying the wet laundry, There is a refresher for spraying steam to prevent allergy caused by laundry, and for washing laundry easily.

The dryer is a household appliance that usually uses the high-temperature air to dry laundry after it has been washed. Generally, the dryer has a drum that receives and rotates the laundry. The laundry is accommodated and supplied with high-temperature dry air to the rotating drum, and the humidifier in the drum is exhausted. The drum of such a dryer is rotatably formed, so that it is difficult to maximize the accommodation space.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a laundry processing apparatus including a drum in which a space for accommodating laundry is maximally secured.

Another object of the present invention is to provide a laundry processing apparatus that supports the drum so that the drum rotates while maintaining a cross section of a non-circular closed curve.

Another object of the present invention is to provide a drum assembly which is rotated while maintaining a cross section of a non-circular closed curve.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a laundry processing apparatus including a drum rotatably installed at a front end or a rear end of a laundry and having a non-circular closed curve having a constant distance from a rotation center, A panel provided at the front or rear of the drum; And a reinforcing member provided at a front edge or rear edge of the drum; .

According to another aspect of the present invention, there is provided a drum assembly comprising: a metal panel having a welding part formed by welding one side edge and the other side edge of the welding part and forming a closed curve; And a reinforcing member provided at a front edge or a rear edge of the weld to prevent cracking of the weld, .

The details of other embodiments are included in the detailed description and drawings.

The laundry processing apparatus of the present invention has one or more of the following effects.

First, there is an advantage that the drum supports the drum so as to be rotatable while maintaining the cross section of the non-circular closed curve.

Second, since the reinforcement member is provided in the welded portion formed on the drum, it is possible to prevent cracks from occurring in the welded portion due to a change in curvature of the rotating drum while maintaining the cross section of the non-circular closed curve. .

Third, since the reinforcing member is provided on the front edge and / or the rear edge of the weld, it is possible to reinforce the strength of the edge of the weld where cracks are most likely to occur, thereby preventing cracks from occurring in the weld.

Fourth, the reinforcing member provided in the weld maintains a predetermined curvature in which cracks are not generated, and prevents the welded portion from reaching a specific curvature at which cracks occur when the drum rotates.

Fifth, the drum clip coupled to the drum simultaneously supports the inner surface and the outer surface of the front edge and / or the rear edge of the drum to reinforce the strength of the welded portion.

Sixth, the circular guide supports the load of the drum and rotates together with the drum so that the drum can rotate while maintaining the cross-section of the non-circular closed curve.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a laundry processing apparatus according to an embodiment of the present invention.
2 is an internal perspective view of a laundry processing apparatus according to an embodiment of the present invention.
3 is an internal front view of a laundry processing apparatus according to an embodiment of the present invention.
4 is a view of a drum assembly according to an embodiment of the present invention.
5 is a plan view of part A shown in Fig.
6 is a view illustrating a drum driving method of a laundry processing apparatus according to an embodiment of the present invention.
7 is a view illustrating a drum driving method of a laundry processing apparatus according to another embodiment of the present invention.
8 is an internal perspective view of a laundry processing apparatus according to an embodiment of the present invention.
9 is a partial cross-sectional view of a laundry processing apparatus according to an embodiment of the present invention.
10 to 13 are views showing a circular guide of the laundry processing apparatus according to another embodiment of the present invention.
14 is an internal perspective view of a laundry processing apparatus according to another embodiment of the present invention.
15 is a partial perspective view showing the front panel of the laundry processing apparatus shown in FIG.
16 is a partial perspective view showing the rear panel of the laundry processing apparatus shown in Fig.
17 to 19 are views showing assistance guides of the laundry processing apparatus according to different embodiments of the present invention.
20 is an internal perspective view of a laundry processing apparatus according to an embodiment of the present invention.
FIG. 21 is an internal front view of the laundry processing apparatus shown in FIG. 20. FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining a laundry processing apparatus according to embodiments of the present invention.

1 is a perspective view of a laundry processing apparatus according to an embodiment of the present invention. 2 is an internal perspective view of a laundry processing apparatus according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a laundry processing apparatus according to an embodiment of the present invention includes a cabinet 101 forming an outer appearance, a drum 110 disposed inside the cabinet 101, A circular guide 120a and 120b rotatably supporting a part of the drum 110 having a constant curvature in section and a front panel 120b supporting the circular guides 120a and 120b and provided on the front and rear sides of the drum 110, 111 and a rear panel 112 and auxiliary guides 140a, 140b for supporting portions not supported by the circular guides 120a, 120b.

The cabinet 101 forms an outer appearance of the laundry processing apparatus. The cabinet 101 has a cabinet entrance and exit hole through which the laundry enters and exits the drum 110, and a door 106 for opening and closing the cabinet entrance and exit holes is rotatably connected. On the front surface of the cabinet 101, a control panel 109 for inputting an operation command by the user or displaying the operation state of the laundry processing apparatus to the user is provided.

A front panel 111 for supporting the front circular guide 120a is provided at the rear of the front of the cabinet 101. [ The front panel 111 is provided with a front circular guide 120a and a front auxiliary guide 140a for maintaining the shape of the drum 110. [

The front panel 111 supports the front circular guide 120a so that the front circular guide 120a is rotatable. The front panel 111 is coupled with the cabinet 101 to support a front circular guide 120a that supports the load of the drum 110. [ The front panel 111 is formed with a panel access hole 111 'corresponding to the cabinet entrance and exit holes of the cabinet 101 and allowing laundry to enter and exit the drum 110. The panel access hole 111 'is opened and closed by a door 106.

The front panel 111 is provided with a blowing fan 131 for exhausting the air in the drum 110 and an exhaust duct 133 through which the air in the drum 110 blown by the blowing fan 131 passes. The front panel 111 is formed with an exhaust hole communicating with the exhaust duct 133 to exhaust air in the drum 110. The front panel 111 contacts the drum 110 in front of the drum 110 to seal the front of the drum 110 so that the air in the drum 110 can be exhausted to the exhaust duct 133 without leakage.

The front panel 111 may be provided with a lint filter (not shown) for filtering the foreign matter of the air exhausted to the blowing fan 131. The air in the drum 110 that has passed through the exhaust duct 133 can be exhausted to the outside of the cabinet 101 or introduced into the heater 130.

A rear panel 112 supporting the rear circular guide 120b is provided on the front of the rear of the cabinet 101. [ The rear panel 112 is provided with a rear circular guide 120b and a rear auxiliary guide 140b for maintaining the shape of the drum 110. [

The rear panel 112 supports the rear circular guide 120b so that the rear circular guide 120b is rotatable. The rear panel 112 is coupled to the cabinet 101 to support a rear circular guide 120b that supports the load of the drum 110. [

The rear panel 112 is provided with an intake duct 135 which is a passage through which air heated by the heater 130 flows into the drum 110. The rear panel 112 is formed with an intake hole communicating with the intake duct 135 to introduce air into the drum 110. The rear panel 112 contacts the drum 110 at the back of the drum 110 to seal the rear of the drum 110 to prevent air from leaking out of the drum 110.

The heater 130 heats the air flowing into the drum 110. The heater 130 heats the outside air flowing through the cabinet or the exhaust duct 133 to heat the air exhausted from the drum 110. The air heated by the heater 130 flows into the drum 110 through the intake duct 135.

The drum 110 receives laundry and rotates. The drum 110 has a tubular shape in which the laundry is received therein and the front and / or rear are opened so that the air passes from the rear to the front. In this case, the front of the drum 110 means the front direction of the cabinet 101, and the rear side of the drum 110 means the rear direction of the cabinet 101. Only one of the front and rear sides of the drum 110 can be opened and both the front and rear sides of the drum 110 can be opened. The drum 110 is provided with a lifter 115 on the inner surface of the drum 110 so that the laundry contained in the drum 110 can be lifted and dropped when the drum 110 rotates.

The drum 110 is formed as a section of a non-circular closed curve whose distance from the center of rotation is not constant. A part of the cross section of the drum 110 has a constant curvature with a constant distance from the center of rotation of the circular guides 120a and 120b. The drum 110 is preferably formed according to the shape of the cabinet in order to secure a maximum accommodation space in the cabinet 101.

The drum 110 is preferably made of a metal or a polymer compound that is bent while being bent so as to rotate while holding a cross section of the non-circular closed curve. The drum 110 is supported by the circular guides 120a and 120b and the auxiliary guides 140a and 140b so as to rotate and maintain the sectional shape of the non-circular closed curve.

The portion of the drum 110 having a constant curvature of section is supported by the circular guides 120a and 120b. The portions of the drum 110 not supported by the circular guides 120a and 120b are supported by the auxiliary guides 140a and 140b. The inner surfaces of the front and rear sides of the drum 110 are preferably sealed in contact with the front panel 111 and the rear panel 112.

The circular guides 120a and 120b support a portion of the drum 110 having a constant curvature of a cross section and are ring-shaped provided on the front panel 111 or the rear panel 112 so as to be rotatable. The circular guides 120a and 120b contact the inner surface of the drum 110 and apply a vertical drag force to the drum 110 in the outward direction to support the drum 110. [ The circular guides 120a and 120b support the load of the drum 110 and rotate together with the drum 110. [

The portion of the drum 110 supported by the circular guides 120a and 120b is constant in distance from the center of rotation of the circular guides 120a and 120b. It is preferable that the circular guides 120a and 120b are disposed so that their center of rotation is higher than the center of rotation of the drum to support the upper inner surface of the drum 110. [

The circular guides 120a and 120b preferably contact the inner surface of the drum 110 as much as possible to support the load of the drum 110. [ The circular guides 120a and 120b are formed to be sufficiently large such that the rotational center of the drum 110 is located inside.

The circular guides 120a and 120b rotate together with the drum 110 so that the curvature of the cross section of the drum 110 comes into contact with the previous portion so that the drum 110 rotates while maintaining the cross section of the non-circular closed curve. It is preferable that the circular guides 120a and 120b increase the friction with the drum 110 so as to rotate together with the drum 110. [ It is preferable that the circular guides 120a and 120b are rotatably supported by minimizing the friction with the front panel 111 or the rear panel 112. [

The circular guides 120a and 120b are provided in plural and include a front circular guide 120a for supporting the inner surface of the front edge of the drum 110 and a rear circular guide 120b for supporting the inner surface of the rear edge of the drum 110 do. The front circular guide 120a is supported by the front panel 111 and the rear circular guide is supported by the rear panel 112. [

The front circular guide 120a is provided around the panel entrance / exit hole 111 'of the front panel 111 so that the panel entrance / exit hole 111' of the front panel 111 is disposed therein. That is, the ring-shaped front circular guide 120a is provided so that the panel entrance hole 111 'is disposed inside.

The auxiliary guides 140a and 140b support a portion of the drum 110 where the circular guides 120a and 120b are not supported by the drum 110 so that the drum 110 rotates while maintaining a cross section of a non-circular closed curve. The auxiliary guides 140a and 140b are coupled with the front panel 111 or the rear panel 112 to support the drum 110 so that the drum 110 can rotate.

It is preferable that the auxiliary guides 140a and 140b are disposed to be positioned lower than the rotation center of the drum to support the lower inner surface of the drum 110. [

The auxiliary guides 140a and 140b contact the inner surface of the drum 110 and generate an elastic force to support the drum 110 by applying a perpendicular force to the drum 110 in the outward direction. It is preferable that the circular guides 120a and 120b increase the friction with the drum 110 while the auxiliary guides 140a and 140b minimize the friction with the drum 110. [

The auxiliary guides 140a and 140b are provided in plural and include a front auxiliary guide 140a for supporting the inner surface of the front edge of the drum 110 and a rear auxiliary guide 140b for supporting the inner surface of the rear edge of the drum 110 do.

3 is an internal front view of a laundry processing apparatus according to an embodiment of the present invention.

Referring to FIG. 3, a laundry processing apparatus according to an embodiment of the present invention includes a drum 110 having a non-circular closed curve whose distance from a rotation center is not constant, a motor 170 generating a rotating force, And a driving belt 175 that receives the rotational force of the motor 170 and rotates the drum 110.

The drum 110 is formed as a section of a non-circular closed curve whose distance from the center of rotation is not constant. In this embodiment, it is preferable that the upper and lower end distances b of the cross section of the drum 110 are larger than the both side end distances a, depending on the shape of the rectangular cabinet 101 whose vertical length is longer than the left and right lengths. A part of the cross section of the drum 110 may have a constant curvature, i.e., a constant radius. Further, a part of the cross section of the drum 110 may be a straight line.

The drive belt 175 and the motor 170 allow the drum 110 to rotate and maintain the cross-section of the non-circular closed curve. The driving belt 175 is in contact with the outer surface of the drum 110 so as not to slip so that a vertical drag force is applied to the drum 110 in the inward direction and the drum 110 is rotated by receiving the rotational force of the motor 170. Preferably, the drive belt 175 is a material of a highly flexible, flexible polymer or metal. It is preferable that the drive belt 175 is made of a material having a high friction coefficient so as not to slip with the outer surface of the drum 110 or to form irregularities on the inner surface of the drive belt 175 and the outer surface of the drum 110, Do.

The motor 170 generates a rotational force to transfer the drive belt 175. The rotational force generated by the motor 170 is transmitted by the drive belt 175 to rotate the drum 110.

FIG. 4 is a view showing a drum assembly according to an embodiment of the present invention, and FIG. 5 is a plan view of a portion A shown in FIG.

4 to 5, a drum assembly according to an embodiment of the present invention includes laundry, is opened at the front and / or rear, is formed into a cross section of a non-circular closed curve whose distance from the rotation center is not constant, And a reinforcing member 150 provided at an edge or rear edge of the front side of the drum 110.

The drum 110 is formed in a cross section of a non-circular closed curve as described above, and one side edge and the other side edge of the metal panel are welded. That is, one side edge and the other side edge, which are two short sides, are welded in a metal panel close to a rectangle, and the cross section is joined so as to form a closed curve of a non-circular shape.

A welded portion of one side edge and the other edge forms a welded portion (W). The welding portion W is formed so as to extend in the direction transverse to the front and rear of the drum 110. The direction of the welded portion W may be formed along a joint line where one side edge and the other side edge are joined to each other and may be formed in a substantially straight line and parallel to the rotational axis direction of the drum 110.

The welding portion W may be formed variously according to a method of welding one side edge and the other side edge. And may be formed by seam welding in a state in which a part of the other side edge is laminated on one side edge, or may be welded by butt welding back to one side edge of the metal panel and the other side edge. Hereinafter, the welding portion W is described as being formed by butt welding, but the welding method of forming the welding portion W is not limited thereto. When the welded portion W is formed by butt welding, the inner surface of the drum 110 on which the welded portion W is formed is smoothly formed.

As the drum 110 rotates while maintaining the shape of the closed circular cross section of the drum 110 when the drum 110 rotates, a portion of the drum 110, on which the weld W is formed, . In this case, when the welded portion W of the drum 110 reaches the upper or lower position of the drum 110, the curvature becomes maximum, and when the welded portion W of the drum 110 reaches the left and right positions of the drum 110 The curvature of the inner surface of the drum 110 is minimized.

The inner surface of the drum 110 where the welded portion W is located is changed in accordance with the curvature change and fatigue is accumulated in the welded portion W due to the changed stress. W may be damaged due to cracks and cracks.

The reinforcing member 150 is provided at the front edge and / or the rear edge of the drum 110 to prevent the welding portion W from being damaged. The reinforcing member 150 reinforces the strength of the welded portion W to prevent cracks from being generated in the welded portion W. Since the reinforcing member 150 is provided in the welded portion W, it is possible to prevent cracks from occurring in the welded portion W due to the change in curvature of the drum 110 rotated while holding the cross- The growth of some generated cracks can be prevented.

The reinforcing member 150 is provided at the edge of the drum 110 where the weld W is formed. The welded portion W formed on the drum 110 extends from the front edge to the rear edge of the drum 110. The welded portion W formed on the front edge and / or the rear edge is most likely to be damaged by fatigue. The weld W formed on the front edge and / or the rear edge of the drum 110 is a point where the stress is maximally concentrated to the point where the edge of one edge meets the edge of the other corner. The stress is increased and it is easily broken by fatigue. The reinforcing member 150 is provided at the front edge and / or the rear edge of the welded portion W, which is the point where the stress is concentrated as much as possible, so as to reinforce the strength of the welded portion W.

Since the reinforcing member 150 is provided at the front edge and / or the rear edge of the welded portion W, the strength of the edge of the welded portion W where cracks are most likely to occur is reinforced, .

The reinforcing member 150 maintains the curvature of the inner surface of the drum 110 where the welded portion W is formed at a predetermined curvature at which cracks do not occur. The welded portion W is generally thermally welded at a high temperature and then rapidly cooled to be transformed into a hard material. The stress is changed as the curvature is changed, and when the curvature of the material portion reaches a specific curvature, the stress is concentrated to the maximum, so that cracks such as fracture may occur in the welded portion W have. At this time, the reinforcing member 150 provided on the welded portion W maintains a predetermined curvature in which cracks are not generated, thereby preventing the welded portion W from reaching a specific curvature at which such cracks occur when the drum 110 rotates .

The reinforcing member 150 may be formed of a plastic material according to an embodiment. The reinforcing member 150 may be formed of a high-strength plastic material that can be finely deformed corresponding to the changing curvature of the drum 110.

Also, according to the embodiment, the reinforcing member 150 may be formed of a metal material. Even in the case of including a metal material, it can be finely deformed corresponding to the changing curvature of the drum 110, and the reinforcing strength can be made larger than that of plastic.

The reinforcing member 150 may be embodied as a drum clip formed to enclose the inner and outer surfaces of the drum 110 at the same time. The drum 110 is coupled to the folded portion by a reinforcing member 150 having one side folded and formed lower. The drum clip coupled to the drum 110 simultaneously supports the inner surface and the outer surface of the front edge and / or rear edge of the drum 110 to reinforce the strength of the welded portion W. [

Also, according to the embodiment, the reinforcing member 150 can support only one of the inner edge or the outer edge of the drum 110. In this case, the reinforcing member 150 may be provided only on one side of the outer surface or the inner surface of the portion where the welded portion W of the drum 110 is formed.

The reinforcing member 150 may be provided on both sides of the drum 110 and may include a reinforcing member 150 for supporting the outer surface of the drum 110, The reinforcing member 150 may be formed as a separate member. In this case, the one side reinforcement member 150 may be formed of a material different from the other side reinforcement member 150.

6 is a view illustrating a drum driving method of a laundry processing apparatus according to an embodiment of the present invention.

6, a laundry processing apparatus according to an embodiment of the present invention includes a belt tensioner 172 for applying tension to a driving belt 175 in contact with a portion of the driving belt 175 that is not in contact with the drum 110, ).

Since the driving belt 175 contacts the motor shaft 171 disposed apart from the drum 110, there is a portion that is not in contact with the drum 110. That is, the driving belt 175 contacts a part of the outer surface of the drum 110. The belt tensioner 172 minimizes the portion that is not in contact with the drum 110 and increases the tension of the drive belt 175.

When the tension of the drive belt 175 is increased, the vertical drag applied to the drum 110 by the drive belt 175 in the inward direction increases, so that the drum 110 is rotated by the circular guides 120a and 120b and / or the auxiliary guides 140a, 140b.

The belt tensioner 172 is disposed near the motor shaft 171 of the motor 170 that rotates the drive belt 175 and contacts the drive belt 175. It is preferable that the belt tensioner 172 is brought into contact with the surface of the drive belt 175 that is not in contact with the drum 110 so that the portion where the drive belt 175 is not in contact with the drum 110 is minimized.

7 is a view illustrating a drum driving method of a laundry processing apparatus according to another embodiment of the present invention.

7, a laundry processing apparatus according to another embodiment of the present invention includes a first belt tensioner 272a and a second belt tensioner 272b which are in contact with a portion of the driving belt 175 that is not in contact with the drum 110, And a tensioner elastic member 272c connecting the first belt tensioner 272a and the second belt tensioner 272b.

The first belt tensioner 272a and the second belt tensioner 272b are symmetrically disposed to contact the drive belt 175 in different directions with respect to the motor shaft 171. [ The first belt tensioner 272a and the second belt tensioner 272b are connected to the tensioner elastic member 272c that generates an elastic force so that an attraction force is generated between the first belt tensioner 272a and the second belt tensioner 272b, Thereby minimizing the portion of the drive belt 175 not contacting the drum 110. The first belt tensioner 272a and the second belt tensioner 272b also maximize the tension of the drive belt 175 to maximize friction between the drive belt 175 and the drum 110, The vertical force applied to the drum 110 in the inward direction is increased so that the drum 110 can be smoothly supported by the circular guides 120a and 120b and / or the auxiliary guides 140a and 140b.

FIG. 8 is an internal perspective view of a laundry processing apparatus according to an embodiment of the present invention, and FIG. 9 is a partial cross-sectional view of a laundry processing apparatus according to an embodiment of the present invention.

8 to 9, a front panel 111 of the laundry processing apparatus according to an embodiment of the present invention includes a front circular guide seating part 111-2 in which a front circular guide 120a is rotatably mounted, A front panel protector 111-1 for preventing the drum 110 from protruding forward, a front sealing panel 111-3 for sealing the front of the drum 110 in contact with the inner surface of the front of the drum 110, And a front panel engaging member 111-9 which is engaged with the front rear of the cabinet 101. [

The front circular guide 120a of the laundry processing apparatus according to an embodiment of the present invention includes a friction reducing member 122 that contacts the front circular guide receiving portion 111-2 of the front panel 111 and reduces friction, And a circular guide bracket 121 coupled to the friction reducing member 122 and supporting the inner surface of the drum 110. [

The apparatus for treating laundry according to an embodiment of the present invention further includes a drum sealer 114 provided at a front edge of the drum 110 to seal between the front of the drum 110 and the front circular guide 120a.

The front circular guide receiving portion 111-2 is seated so that the front circular guide 120a is rotatable. The front circular guide seating portion 111-2 is formed in a ring shape corresponding to the shape of the front circular guide 120a so as to support the inside of the front circular guide 120a. The front circular guide seat 111-2 is brought into contact with the friction reducing member 122 of the front circular guide 120a.

The front circular guide receiving portion 111-2 is configured such that the front side (the front side of the cabinet 101) is engaged with the front panel protector 111-1 and the rear side (drum 110 side) ). The front circular guide seat 111-2 is coupled to the front panel protector 111-1 concentrically. The front circular guide seating part 111-2 is coupled to the upper part of the front sealing panel 111-3 so that the center of the front circular guide seating part 111-2 is positioned higher than the center of the front sealing panel 111-3 do. The front circular guide seating portion 111-2 is formed to be sufficiently large so that the center of rotation of the drum 110 is located inside.

The front circular guide seating portion 111-2 is disposed around the panel entrance / exit hole 111 'so that the laundry can be taken in and out of the drum 110. That is, the ring-shaped front circular guide seat receiving portion 111-2 is provided so that the panel entrance hole 111 'is disposed inside.

When the laundry is charged into the drum 110 and then rotated, unbalance occurs in the drum 110 due to unbalance of the actual center of gravity of the rotational axis of the drum 110 due to unbalanced distribution of the laundry. do. The drum 110, the front circular guide 120a and the front circular guide receiving portion 111-2 of the front panel 111 can be separated from each other by the axial vibration and / or the vertical vibration of the drum 110 . The front circular guide 120a is seated in the front circular guide seat 111-2 between the front panel protector 111-1 and the front sealing panel 111-3 and therefore the vibration of the drum 110 due to the unbalance of the drum 110 The front circular guide 120a is prevented from being disengaged from the front circular guide receiving portion 111-2 toward the front or rear.

The front circular guide seat 111-2 is engaged with the front panel engaging member 111-9 which is engaged with the front rear of the cabinet 101. [

The front sealing panel 111-3 is formed to correspond to the shape of the drum 110 and is in contact with the inner surface in front of the drum 110. [ The front sealing panel 111-3 is formed in a cross section of a non-circular closed curve whose distance from the center is not constant corresponding to the shape of the drum 110. [ The front sealing panel 111-3 is formed with a panel entrance / exit hole 111 'through which the laundry enters / exits the drum 110. [ The front sealing panel 111-3 is formed with an exhaust hole communicating with the exhaust duct 133 to exhaust air in the drum 110. [

The front sealing panel 111-3 is engaged with the rear side of the front circular guide seat 111-2. The front sealing panel 111-3 protrudes outward from the front circular guide seating part 111-2 to prevent the front circular guide 120a from being rearwardly displaced due to vibration due to unbalance of the drum 110 .

The front circular guide seating part 111-2 is disposed around the panel entrance hole 111 'of the front sealing panel 111-3 so that the laundry can be taken in and out of the drum 110. [ That is, the ring-shaped front circular guide seat receiving portion 111-2 is provided so that the panel entrance hole 111 'is disposed inside.

The front sealing panel 111-3 includes a panel sealer 111-4 which is in contact with the inner surface of the front side of the drum 110 while reducing friction. The panel sealer 111-4 is formed of a synthetic material in which polytetrafluoroethylene (PTFE) oil having low coefficient of friction is drained to seal the front of the drum 110 and reduce friction. According to the embodiment, the panel sealer 111-4 may be formed of a fabric or a rubber material.

The front sealing panel 111-3 is engaged with the auxiliary guides 140a and 140b at a lower portion of the portion to which the front circular guide seat 111-2 is coupled. The auxiliary guides 140a and 140b are fixedly coupled to the lower portion of the front sealing panel 111-3 to support a portion of the drum 110 where the circular guides 120a and 120b are not supported.

The front panel protector 111-1 is formed in a ring shape corresponding to the shape of the front circular guide seat receiving portion 111-2. The front panel protector 111-1 is engaged with the front side of the front circular guide seat 111-2.

The front panel protector 111-1 protrudes outward from the drum 110 to prevent the drum 110 from projecting forward. The front panel protector 111-1 is bent so that its outer edge faces the front side of the cabinet 101 to allow the drum 110 to protrude to some extent forward. However, due to vibration due to unbalance of the drum 110, When the drum 110 is excessively protruded, the front panel protector 111-1 is contacted with the drum sealer 114 to prevent the drum 110 from being excessively projected.

The front panel protector 111-1 protrudes outward from the front circular guide seat receiving portion 111-2 to prevent the front circular guide 120a from being forwardly released due to vibration due to unbalance of the drum 110 . The front panel protector 111-1 is engaged with the front panel engaging member 111-9 which is engaged with the front rear of the cabinet 101. [

The front panel joining member 111-9 engages the front circular guide seating portion 111-2, the front panel protector 111-1 and the front rear portion of the cabinet 101 so that the front circular guide seating portion 111- 2 support the load of the drum 110.

The friction reducing member 122 is brought into contact with the front circular guide seat 111-2 so that the front circular guide bracket 121 supports the load of the drum 110 and is rotatable. The friction reducing member 122 may be variously implemented according to the embodiment as a kind of bearing. In this embodiment, the friction reducing member 122 is a rotatable circular guide roller 122 which rolls along the front circular guide seat 111-2. The circular guide roller 122 is provided with a roller shaft 123 which rotatably connects the circular guide roller 122 to the circular guide bracket 121.

The circular guide bracket 121 contacts the inner surface of the drum 110 and applies a vertical drag force to the drum 110 in the outward direction to support the drum 110. The circular guide bracket 121 may be rotated together with the drum 110 so that the portion of the circular guide bracket 121 that is in contact with the inner surface of the drum 110 is increased in friction. That is, the upper surface of the circular guide bracket 121, which is in contact with the inner surface of the drum 110, is preferably provided with or coated with a material having a high friction coefficient.

A friction reducing member 122 is provided below the circular guide bracket 121. It is preferable that the front side surface of the circular guide bracket 121 is in contact with the drum sealer 114 to seal the front of the drum 110. [

The drum sealer 114 is provided to surround the front edge of the drum 110. The drum sealer 114 contacts the front side surface of the circular guide bracket 121 to seal between the front of the drum 110 and the front circular guide 120a. The drum 110 is contacted with the panel sealer 111-4 to be sealed first and the drum sealer 114 is brought into contact with the circular guide bracket 121 to be secondarily sealed. Even if the primary sealing by the panel sealer 111-4 is released due to the vibration due to the unbalance of the drum 110, the drum sealer 114 is sealed with the secondary seal to block the leakage of the air in the drum 110. [

The drum sealer 114 contacts the front side surface of the circular guide bracket 121 to prevent the drum 110 from being separated from the circular guide bracket 121 due to vibration due to unbalance of the drum 110, Thereby preventing the circular guide 120a from being disengaged.

The drum sealer 114 is in contact with the front panel protector 111-1 when the drum 110 is excessively projected forward due to vibration due to unbalance of the drum 110. [ The drum sealer 114 contacts the front panel protector 111-1 to prevent the drum 110 from being excessively projected forward and to seal between the drum 110 and the front panel protector 111-1 . Therefore, even when the primary seal and the secondary seal are released due to the excessive vibration of the drum 110, the drum sealer 114 comes into contact with the front panel protector 111-1 and the drum 110 is thirdly sealed.

The drum sealer 114 is preferably made of a material having a low friction coefficient so that the drum 110 can smoothly rotate even when the drum sealer 114 is in contact with the front panel protector 111-1. The drum sealer 114, like the panel sealer 111-4, is preferably formed of a synthetic material in which PTFE oil is drained, and may be formed of a fabric or a rubber material according to an embodiment. It is preferable that the drum sealer 114 is also provided on the rear edge of the drum 110.

A reinforcing member 150 (not shown) may be disposed on the inner side of the drum sealer 114. That is, the reinforcing member 150 is provided at the edge of the portion of the drum where the weld W is formed, and the reinforcing member 150 (not shown) joined to the weld W when the drum sealer 114 is coupled along the edge of the drum And is coupled to the outermost side of the drum 110 edge.

The above description of the front panel 111 and the front circular guide 120a also applies to the back panel 112 and the rear circular guide 120b.

The rear panel 112 includes a rear circular guide seat portion (not shown) on which the rear circular guide 120b is rotatably seated, a rear sealing portion 121a which is in contact with the inner surface of the rear portion of the drum 110 to seal the rear of the drum 110, A rear panel protector (not shown) for preventing the drum 110 from protruding rearward, and a rear panel coupling member (not shown) coupled to the front of the rear surface of the cabinet 101.

The rear circular guide 120b includes a friction reducing member (not shown) that contacts the rear circular guide seat portion and reduces the friction, a circular guide And a bracket (not shown).

The description of each constituent element is replaced with the above description. However, the rear sealing panel does not have a panel entrance hole 111 ', and an intake hole communicating with the intake duct 135 instead of the exhaust hole and introducing air into the drum 110 is formed. Further, the orientation of the arrangement or shape of each component element can be changed.

10 to 13 are views showing a circular guide of the laundry processing apparatus according to another embodiment of the present invention.

Referring to Fig. 10, the friction reducing member of the front circular guide 120a is formed as a sliding member 222. Fig. The entire inner surface of the sliding member 222 is in surface contact with the front circular guide seat receiving portion 111-2. It is preferable that the sliding member 222 is formed of a sliding member whose friction is minimized and a rubbing channel fluid film is formed between the sliding member 222 and the front circular guide seating portion 111-2 to minimize friction. The sliding member 222 is engaged with the circular guide bracket 221 and the circular guide bracket 221 supports the inner surface of the drum 110.

11, the frictional reducing member of the front circular guide 120a is formed by a circular guide roller 322, and a part of the circular guide roller 322 is inserted into the front circular guide seat 111-2, A circular guide receiving groove 111-2 'is formed. The circular guide roller 322 is partially inserted into the circular guide receiving groove 111-2 'and rotated so that the circular guide roller 322 is rotated by the unbalance of the drum 110, -2).

12, the circular guide bracket 421 is formed with a bracket projection 421 'protruding downward and the bracket projection 421' has a circular guide seat formed in the front circular guide seat receiving portion 111-2 Is inserted into the groove 111-2 '. The bracket protrusion 421 'is inserted into the circular guide mounting groove 111-2' to reduce friction and the bracket protrusion 421 'is inserted into the front circular guide seat 111' by the vibration due to the unbalance of the drum 110 -2). The friction reducing member 422 is filled between the circular guide bracket 121 and the front circular guide seat 111-2 as lubricating oil formed from the fluid film.

Referring to FIG. 13, the circular guide bracket 521 has a bracket projection 521 'protruding downward in a wedge shape. The description of the other parts is replaced with the contents described with reference to FIG.

10 to 13 illustrate the front circular guide 120a and the front circular guide seat 111-2. However, in the rear circular guide 120b and the rear circular guide seat (not shown) Can be applied.

15 is a partial perspective view showing a front panel of the laundry processing apparatus shown in FIG. 14, FIG. 16 is a sectional view of the laundry washing apparatus shown in FIG. 14, Fig. 6 is a partial perspective view showing the rear panel of the processing apparatus. Fig.

14 to 16, a laundry processing apparatus according to another embodiment of the present invention includes an upper circular portion (not shown) for supporting an upper inner surface of the drum 110, The guides 220a and 220b and the lower circular guides 220c and 220d are disposed such that the center of rotation is positioned lower than the center of rotation of the drum 110 to support the lower inner surface of the drum 110. [

The upper circular guides 220a and 220b contact with a portion having a constant curvature at an upper portion of the drum and rotate together with the drum 110. The lower circular guides 220c and 220d are in contact with a portion And rotates together with the drum 110. The upper and lower circular guides 220a and 220b and the lower circular guides 220c and 220d are preferably supported so as to minimize the friction with the front panel 211 or the rear panel 212 to be rotatable.

The upper circular guides 220a and 220b and the lower circular guides 220c and 220d are respectively provided in a plurality and include an upper front circular guide 220a and a lower front circular guide 220c supported by the front panel 211, An upper rear circular guide 220b and a lower rear circular guide 220d supported by the rear panel.

The upper front circular guide 220a and the lower front circular guide 220c are staggered so as to be supported by the front panel 211 and include an upper front circular guide seat 211-2a provided on the front panel 211, And is held in contact with the circular guide seat part 211-2c. The upper front circular guide 220a and the lower front circular guide 220c are provided around the panel entrance hole 211 'of the front panel 211. [ That is, the upper front circular guide 220a and the lower front circular guide 220c are disposed so that the panel entrance hole 211 'is located inside.

The upper rear circular guide 220b and the lower rear circular guide 220d are staggered to be supported by the rear panel 212 and are provided with an upper rear circular guide seat 211-2b provided on the rear panel 212, And is held in contact with the circular guide seating portion 211-2d.

17 to 19 are views showing assistance guides of the laundry processing apparatus according to different embodiments of the present invention.

17, the auxiliary guides 140a and 140b include an auxiliary guide slider 141 for supporting the drum 110 in contact with the inner surface of the drum 110, and an auxiliary guide slider 141 for supporting the drum 110, An auxiliary guide elastic member 143 for applying an elastic force to the auxiliary guide slider 141 so as to apply a force to the auxiliary guide elastic member 143 in the outward direction and an auxiliary guide elastic member 143 fixedly coupled to the front panel 111, (149).

The auxiliary guide slider 141 supports the drum 110 by contacting the inner surface of the drum 110 so that the drum 110 rotates while maintaining the cross section of the non-circular closed curve. The auxiliary guide slider 141 supports a portion of the drum 110 where the circular guides 120a and 120b are not supported. The auxiliary guide slider 141 may be formed of a sliding member having a low coefficient of friction or may be formed of a material having a low coefficient of friction at a portion contacting the drum 110. In order to contact the auxiliary guide slider 141 slidably with the drum 110, .

The auxiliary guide slider 141 receives the elastic force from the auxiliary guide elastic member 143 and applies a force to the drum 110 in the outward direction to support the drum 110. That is, the auxiliary guide slider 141 applies a vertical drag force to the drum 110 in the outward direction. The auxiliary guide elastic member 143 is formed of a compression coil spring and applies an elastic force to the auxiliary guide slider 141. The auxiliary guide engaging portion 149 is fixedly coupled to the lower portion of the front sealing panel 111-3 of the front panel 111. [

Referring to FIG. 18, the auxiliary guides 140a and 140b include a plurality of auxiliary guide rollers 241 that are in contact with the inner surface of the drum 110 to rotate and support the drum 110, and auxiliary guide rollers 241 And an auxiliary guide engaging portion 249 which is engaged with the auxiliary guide supporter 243 and is fixedly coupled to the front panel 111. The auxiliary guide supporter 243 rotates the auxiliary guide supporter 243, An auxiliary guide elastic member (not shown) is provided between the auxiliary guide support portion 243 and the auxiliary guide engagement portion 249 to apply an elastic force to the auxiliary guide support portion 243.

The auxiliary guide rollers 241 support the drum 110 by contacting the inner surface of the drum 110 so that the drum 110 rotates while maintaining the cross section of the non-circular closed curve. The auxiliary guide roller 241 supports a portion of the drum 110 where the circular guides 120a and 120b are not supported. The auxiliary guide roller 241 is formed of a rotating body that rolls along the drum 110 to minimize friction with the drum 110.

The auxiliary guide roller 241 is rotatably supported by the auxiliary guide support portion 243. The auxiliary guide support portion 243 is rotatably coupled to the auxiliary guide engaging portion 249 and receives a resilient force from the auxiliary guide elastic member to generate a force to rotate in the inner surface direction of the drum 110. [ The auxiliary guide roller 241 receives a force from the auxiliary guide support portion 243 and applies a force to the drum 110 in the outward direction to support the drum 110. That is, the auxiliary guide roller 241 applies a vertical drag force to the drum 110 in the outward direction.

The auxiliary guide elastic member is formed of a torsion spring to apply an elastic force to the auxiliary guide support portion 243. The auxiliary guide engaging portion 249 is fixedly coupled to a lower portion of the front sealing panel 111-3 of the front panel 111. [

19, an auxiliary guide plate spring 341 for supporting the drum 110 in contact with the inner surface of the drum 110, and an auxiliary guide plate spring 341 for supporting the auxiliary guide plate spring 341 and fixedly coupled to the front panel 111 And a plurality of auxiliary guide engaging portions 349.

The auxiliary guide plate spring 341 contacts the inner surface of the drum 110 to support the drum 110 so that the drum 110 rotates while maintaining the cross section of the non-circular closed curve. The auxiliary guide plate spring 341 supports a portion of the drum 110 where the circular guides 120a and 120b are not supported. The auxiliary guide plate spring 341 may be formed of a material having a low friction coefficient so that the auxiliary guide plate spring 341 slides on the drum 110 or a material having a low coefficient of friction may be formed on the portion contacting the drum 110 .

The auxiliary guide plate spring 341 generates an elastic force to apply a vertical drag force to the drum 110 in the outward direction. The auxiliary guide engaging portion 349 is engaged with both ends of the auxiliary guide plate spring 341 and fixedly coupled to the lower portion of the front sealing panel 111-3 of the front panel 111. [

FIG. 20 is an internal perspective view of a laundry processing apparatus according to an embodiment of the present invention, and FIG. 21 is an internal front view of the laundry processing apparatus shown in FIG.

20 to 21, the laundry processing apparatus according to an embodiment of the present invention includes an auxiliary belt 185 contacting a portion where the driving belt 175 does not contact, (Not shown).

The auxiliary belt 185 is in contact with the portion of the outer surface of the drum 110 where the drive belt 175 does not contact. The auxiliary belt 185 comes into contact with the portion where the drive belt 175 does not contact when the drum 110 is projected forward and backward as shown in Fig. The auxiliary belt 185 supports the drum 110 by applying a vertical force in an inward direction to a portion of the drum 110 in which the drive belt 175 does not apply a normal drag force to the drum 110 in the inward direction.

It is preferable that the auxiliary belt 185 contacts the portion of the drum 110 located near the motor 170 to support the load of the drum 110. [ The auxiliary belt 185 supports the load of the drum 110, which changes in accordance with the load variation of the laundry, so that the drum 110 can rotate while maintaining the cross section of the non-circular closed curve. The auxiliary belt 185 also supports the load of the drum 110 dispersedly with the driving belt 175 to prevent the driving belt 175 from being broken.

The auxiliary belt 185 supports the lower outer surface of the drum 110 to prevent the drum 110 from being biased toward the motor 170 to prevent the air in the drum 110 from leaking.

The auxiliary belt 185 contacts the outer surface of the drum 110 so as not to slip and rotates together with the drum 110. The auxiliary belt 185 is preferably made of a polymer material or a metal material that is well-bending and elastic. It is preferable that the auxiliary belt 185 is made of a material having a high friction coefficient so as not to slip with the outer surface of the drum 110 or to form irregularities on the inner surface of the auxiliary belt 185 and the outer surface of the drum 110, Do.

The idler 182 contacts the auxiliary belt 185 to apply tension to the auxiliary belt 185. [ The idler 182 is preferably positioned on the opposite side of the motor 170 with respect to the center of rotation of the drum 110. The idler 182 is brought into contact with the auxiliary belt 185 on the opposite side of the motor 170 so that the auxiliary belt 185 is provided on the portion of the drum 110 in which the drive belt 175 does not give the normal force to the drum 110 in the inward direction ) Gives the drum 110 the maximum vertical force in the inward direction.

The idler 182 increases the tension of the auxiliary belt 185 to maximize the friction between the auxiliary belt 185 and the drum 110 and prevents the auxiliary belt 185 from moving in a direction perpendicular to the drum 110 So that the drum 110 can be smoothly supported by the circular guides 120a and 120b and / or the auxiliary guides 140a and 140b.

The idler 182 may be rotatably coupled to the cabinet 101. It is preferable that the center of rotation of the idler 182 changes during rotation so as to actively cope with the vibration of the drum 110. The idler 182 is preferably connected to the cabinet 101 by an elastic member (not shown) such that the rotation center of the idler 182 changes during rotation.

18, and a plurality of idlers 182 may be provided when a plurality of auxiliary belts 185 are provided. The first auxiliary belt 185a supports the front side of the drum 110 and the second auxiliary belt 182b supports the rear side of the drum 110 so that the drum 110 maintains a non- While suppressing the vibration of the drum 110 due to the unbalance of the drum 110. The first auxiliary belt 185a contacts the first idler 182a to receive a tension and the second auxiliary belt 182b contacts the second idler 182b to receive a tension.

The operation of the laundry processing apparatus according to the present invention will now be described.

When the user puts the laundry into the drum 110 and then operates the laundry processing device, the heater 130 heats the air, and the heated air flows into the drum 110 and the drum 110 rotates.

The air heated by the heater 130 flows into the drum 110 through the intake duct 135 from the rear panel 112 side. The front and rear sides of the drum 110 are sealed by the front panel 111 and the rear panel 112, respectively. The drum 110 is contacted with the panel sealer 111-4 to be sealed first and the drum sealer 114 is brought into contact with the circular guide bracket 121 so as to be sealed with the secondary seal so that leakage of air in the drum 110 is blocked do. The drum sealer 114 comes into contact with the front panel protector 111-1 even when the primary seal and the secondary seal are released due to the excessive vibration of the drum 110 so that the drum 110 is thirdly sealed. The air in the drum 110 is exhausted to the exhaust duct 133 by the blowing fan 131 and the air exhausted to the exhaust duct 133 is discharged to the outside of the cabinet 101 or into the heater 130 again.

On the other hand, when the motor 170 generates the rotational force, the driving belt 175 rotates the drum 110. As the drum 110 rotates, the front circular guide 120a and the rear circular guide 120b rotate together and a portion of the drum 110 having a constant curvature is supported by the circular guides 120a and 120b. The portion of the drum 110 not supported by the circular guides 120a and 120b is supported by the auxiliary guides 140a and 140b and thus rotates while maintaining the cross section of the non-circular closed curve. The circular guides 120a and 120b and the auxiliary guides 140a and 140b come into contact with the inner surface of the drum 110 to give a vertical force to the drum 110 in the outward direction to support the drum 110, And the auxiliary belt 185 come into contact with the outer surface of the drum 110 to impart a vertical force to the drum 110 in the inward direction to support the drum 110. [ The auxiliary belt 185 contacts a portion where the drive belt 175 does not contact to prevent the drum 110 from being biased.

When the drum 110 rotates, the laundry is lifted up by the lifter 115, falls down, and the heated air dries the laundry.

Although the laundry processing apparatus has been described as being limited to the dryer, the idea of the present invention can be applied to various laundry processing apparatuses such as washing machines in which a drum is used.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

101: cabinet 106: door
109: Control panel 110: Drums
111, 211: front panel 111 ', 211': panel entrance hole
111-1: front panel protector 111-2: front circular guide seat part
211-2a: upper front circular guide seat portion
211-2b: upper rear circular guide seat portion
211-2c: lower front circular guide seat portion
211-2d: lower rear circular guide seat portion
111-2 ': circular guide seating groove 111-3: front sealing panel
111-4: panel sealer 111-9: front panel joining member
112: rear panel 114: drum sealer
115: lifter 130: heater
131: blower fan 133: exhaust duct
135: intake duct 120a: front circular guide
120b: rear circular guide 220a: upper front circular guide
220b: upper rear circular guide 220c: lower front circular guide
220d: Lower rear circular guide 421 ', 521': Bracket projection
121, 221, 321, 321, 421, 521: circular guide bracket
122, 222, 322, 422, 522: friction reducing member
122, 322: circular guide roller 222: sliding member
123: roller shaft 140a: forward assistance guide
140b: rear auxiliary guide 141: auxiliary guide slider
241: Auxiliary guide roller 341: Auxiliary guide plate spring
143: Auxiliary guide elastic member 243: Auxiliary guide support member
149, 249, 349: auxiliary guide coupling portion 170: motor
171: Motor shaft 172: Belt tensioner
272a: first belt tensioner 272b: second belt tensioner
272c: tensioner elastic member 175: drive belt
182: idler 182a: first idler
182b: second idler 185: auxiliary belt
185a: first auxiliary belt 185b: second auxiliary belt
150: reinforcing member

Claims (19)

A drum rotatably formed in a cross section of a non-circular closed curve having a constant distance from the center of rotation, the drum being rotatable;
A drum sealer provided at a front edge or a rear edge of the drum;
A ring-shaped circular guide rotatably supporting a portion of the drum having a constant curvature in section;
A panel provided at the front or rear of the drum; And
And a reinforcing member provided at a front edge or rear edge of the drum,
Wherein the reinforcing member is deformed corresponding to a changing curvature of the drum, the panel supports the circular guide so that the circular guide is rotatable, the drum sealer seals between the drum and the circular guide, And the member is coupled to the inside of the drum sealer.
The method according to claim 1,
Wherein the drum has a welded portion extending in a direction transverse to the front and rear of the drum.
3. The method of claim 2,
Wherein the reinforcing member is provided at the edge of the weld.
3. The method of claim 2,
Wherein the reinforcing member prevents cracks from growing in the welded portion.
The method according to claim 1,
Wherein the reinforcing member is formed of a plastic material.
The method according to claim 1,
Wherein the reinforcing member is formed of a metal material.
3. The method of claim 2,
Wherein the welding portion of the drum is formed by welding one side edge and the other side edge of the metal panel by butt welding.
delete The method according to claim 1,
Wherein the reinforcing member is a drum clip configured to simultaneously enclose an inner surface and an outer surface of the drum.
The method according to claim 1,
Wherein the reinforcing member supports an inner edge or an outer edge of the drum.
3. The method of claim 2,
Wherein the reinforcing member holds the curvature of the inner surface of the drum where the welded portion is formed at a predetermined curvature at which cracks do not occur.
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