JP2015019840A - Drum-type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum-type washing machine in which the adhering of lint to a door bellows is reduced.SOLUTION: A drum-type washing machine includes: an outer tub 10 supported in a housing 3 and storing washing water therein; an inner tub 8 rotatably supported in the outer tub 10 and accommodating laundry; a driving device rotationally driving the inner tub 8; a laundry loading opening 3a provided in the housing 3; a door 2 provided at the laundry loading opening 3a in an openable and closable manner; and a door bellows 11 brought into contact with the door 2 when the door 2 is closed, thereby sealing the door 2 and the outer tub 10 in a watertight manner. In the drum-type washing machine, the average surface roughness of a contact part 11b in contact with the door 2 in the door bellows 11 is made different from the average surface roughness of a door bellows portion located, further than the contact part 11b, on the side of a space which is enclosed by the door 2 and the outer tub 10 and sealed in a watertight manner.

Description

  The present invention relates to a drum type washing machine.

  In general, a drum-type washing machine uses a rubber packing called a door bellows for water sealing between a door and a washing tub. Rubber has a characteristic that dirt such as lint tends to adhere to the surface due to its viscosity and the oil content of the rubber. In addition, the space between the door bellows and the door glass, and the bent structure at the location where the washing tub and the washing machine casing are connected are structures that allow air containing lint in the tub to easily stagnate. Lint tends to accumulate around. It is pointed out in Patent Document 1 that if a large amount of lint accumulates, the yarn waste pushes and deforms the outer tank cover, and the rotating drum tank and the outer tank front cover may come into contact with each other.

  In the drum-type washing machine of Patent Document 1, a path for escaping accumulated lint is provided in the lower peripheral portion of the outer tub cover, and the above problem is solved by adopting a structure in which lint does not accumulate more than a certain amount. Yes.

JP 2012-85842 A

  However, even when a path for discharging the accumulated lint is provided, it is not possible to prevent the lint from adhering to the bellows. And even if it does not lead to an abnormal operation such that the outer tank cover and the rotating drum tank come into contact with each other, there is a possibility that the yarn waste generated during the drying remains attached to the bellows after the operation.

  In a general drum-type washing machine, lint and textile waste generated by rubbing clothes, etc., which are laundry, during the drying process can be passed through a filter built in the washing machine. Be captured. However, it is difficult to capture all of the lint and fiber waste, and some of them adhere to the washing tub such as the outer tub wall surface. Here, particularly lint and fiber litter easily adhere to rubber door bellows, and in order to remove lint adhering to the door bellows, it must be periodically wiped with a rag or the like. However, if the lint adheres to a part of the door bellows exposed inside the outer tub that is difficult to see from the laundry input port, the door bellows prevents the bite of the laundry from being lifted. The bellows had to be turned over and wiped off, and the cleaning work was complicated.

  In addition, if lint adheres to the door bellows after washing, if the laundry is not taken out from the washing tub after cleaning the door bellows in advance, lint attached to the place where the laundry and the door bellows come into contact with each other. It will adhere to the laundry.

  In the present specification, the term “lint” including lint, fiber lint, or similar causative substances is used.

  An object of the present invention is to provide a drum type washing machine that reduces the adhesion of lint to a door bellows.

  In order to solve the above-mentioned problems, the drum type washing machine of the present invention is attached to the opening of the outer tub, and in the door bellows that seals the space between the outer tub and the door that closes the outer tub opening. The surface average roughness of the portion and the surface average roughness of the portion located on the inner side of the outer tub (the space side sealed by the door and the outer tub in a watertight manner) are different from the contact portion. As a result, the door bellows portion located on the inner side of the outer tub from the contact portion with the door can be made to have an average surface roughness that makes it difficult for lint to adhere, and the contact portion with the door is maintained or improved in water tightness. The surface average roughness can be made suitable.

  ADVANTAGE OF THE INVENTION According to this invention, the drum-type washing machine which the adhesion of the yarn waste to the door bellows was suppressed and the watertightness between an outer tub and a door was maintained or improved can be provided.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is the perspective view which cut and showed a part of housing | casing in order to show the internal structure of the drum type washing-drying machine which concerns on embodiment of this invention. It is side surface sectional drawing which shows the internal structure of the drum type washing-drying machine which concerns on embodiment of this invention. It is a perspective view of the outer tank cover containing the partial cross section cut | disconnected and shown by the AA line of FIG. It is a partial expanded sectional view corresponding to the B section of FIG.

  Hereinafter, a drum type washing machine 1 according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. The drum type washing machine according to the present embodiment is mainly characterized in that the surface of the door bellows 11 is processed to prevent lint from adhering. Below, the whole structure of a drum type washing machine is demonstrated first, and the process of the door bellows 11 is demonstrated in detail after that. In the present embodiment, a drum-type washing / drying machine 1 that is a drum-type washing machine having a drying function will be described as an example. The front / rear / left / right / up / down directions in the following description are based on the front / rear / left / right / up / down directions shown in FIG.

≪Drum-type washing dryer 1≫
The overall configuration of the drum-type washing and drying machine 1 will be described with reference mainly to FIGS. 1 and 2. FIG. 1 is a perspective view in which a part of a housing 3 is cut to show an internal structure of a drum type washing / drying machine 1 according to an embodiment of the present invention. FIG. 2 is a side sectional view showing the internal structure of the drum-type washing / drying machine 1 according to the embodiment of the present invention.

  The door 2 is for closing a slot for loading and unloading the laundry provided in the approximate center of the front cover 1c, and a hinge (not shown) provided on a front reinforcing member (not shown) of the drum type laundry dryer 1. It is supported so that it can be opened and closed.

  The detergent container 5 is provided on the upper left side of the drum-type washing / drying machine 1, and a drawer-type detergent tray (not shown) is mounted from the front opening. Behind the detergent container 5 are provided water supply related parts such as a water supply valve (electromagnetic valve), a bath water absorption pump, and a water level sensor (not shown).

  The top cover 1e is provided with a water supply hose connection port 16 to which a water supply hose (not shown) extending from the water tap is connected. The top cover 1e is also provided with a water absorption hose connection port 17 to which a water absorption hose (not shown) for absorbing the remaining hot water of the bath is connected.

  The drum 8 (inner tub) of the drum type washing and drying machine 1 has a bottomed cylindrical shape. The drum 8 is rotatably supported in the outer tub 10 and has a large number of through holes 32 for water flow and ventilation on its outer peripheral wall. Moreover, it has the opening part 8a for taking in and out the laundry in the front side end surface. A fluid balancer 8c integrated with the drum 8 is provided outside the opening 8a. A plurality of lifters 8b extending in the axial direction are discretely provided on the inner peripheral wall of the drum 8 in the circumferential direction. When the drum 8 rotates during washing and drying, the laundry is lifted along the inner peripheral wall of the drum 8 by the lifter 8b and centrifugal force, and performs a tumbling operation that repeats the movement of falling by gravity. The rotation center axis of the drum 8 is inclined by about 0 to 30 ° with respect to the horizontal so that the horizontal or opening 8a side becomes higher.

  The bottomed cylindrical outer tub 10 encloses the drum 8 coaxially and has an open front surface. That is, the outer tub 10 is inclined according to the inclination of the drum 8. The outer tub 10 is provided with a drum motor 9 in the center of the outer side of the rear end face. A rotating shaft 9 a of the drum motor 9 passes through the outer tub 10 and is coupled to the drum 8.

  An outer tank cover 100 is provided in the opening on the front surface of the outer tank 10. By attaching the outer tub cover 100, the outer tub 10 can store water therein. A front side opening 101 for taking in and out the laundry is provided at the front center of the outer tub cover 100.

  And the opening part (illustration omitted) provided in the housing | casing 3 of the front side opening part 101 and the drum type washing-drying machine 1 is connected by the rubber door bellows 11 (annular seal member). That is, the door bellows 11 is provided along the periphery of the front side opening 101. The door bellows 11 is in contact with the inner surface of the door 2 by closing the door 2 and seals (water seals) the outer tub 10 in a watertight manner. That is, the door bellows 11 is attached to the opening of the outer tub 10, and the space between the outer tub 10 and the door 2 that closes the opening of the outer tub 10 is watertight.

  The outer tub 10 is supported in an anti-vibration manner by a suspension 13 (consisting of a coil spring and a damper) whose lower side is fixed to the base 1h. Further, the upper side of the outer tub 10 is supported by an auxiliary spring (not shown) attached to the upper reinforcing member, and the outer tub 10 can be prevented from falling in the front-rear direction.

  The drying duct 18 is installed vertically inside the back surface of the drum type washing and drying machine 1, and the lower part of the drying duct 18 is connected to an air inlet 10 e provided below the back surface of the outer tub 10 through a rubber bellows tube 18 a. . A water cooling / dehumidifying mechanism (not shown) is built in the drying duct 18. Cooling water is supplied to the water-cooled dehumidifying mechanism from the water supply valve (not shown).

  The upper part of the drying duct 18 is connected to a filter duct 19 installed in the front-rear direction on the upper right side in the drum type washing and drying machine 1. The filter duct 19 has an opening on the front surface, and a drawer-type drying filter 20 is inserted into the opening. The air that has entered the filter duct 19 from the drying duct 18 flows into the mesh filter portion (not shown) of the drying filter 20, and lint is removed.

  Cleaning of the dry filter 20 is performed by pulling out the dry filter 20 and taking out the mesh filter portion.

  In addition, an opening is provided on the lower surface of the insertion portion of the dry filter 20 in the filter duct 19. Through this opening, the filter duct 19 is connected to the intake port of the blower unit 21 via an intake duct (not shown).

  The blower unit 21 includes a driving fan motor 22, an impeller (not shown), and a fan case (not shown). A fan heater 23 is built in the fan case, and the fan heater 23 heats the air sent from the impeller.

  The discharge port of the blower unit 21 is connected to the blower duct 24. The air duct 24 is connected to a blowout port 25 provided in the outer tank cover 100 via a rubber bellows tube 24a. In the present embodiment, the blower unit 21 is provided on the upper right side in the housing 3 of the drum type washing and drying machine 1. As a result, the blowout port 25 is located obliquely upward to the right when viewed from the front of the outer tank cover 100, and is devised so that the distance from the blower unit 21 to the blowout port 25 is as short as possible.

  As described above, the air in the drum 8 passes from the through holes 32 provided in the wall surface of the drum 8 to the outer tank 10, and the bellows pipe 18 a and the drying duct are sequentially arranged from the air inlet 10 e provided below the back of the outer tank 10. 18, the filter duct 19, and the air inlet of the blower unit 21. The warm air is accelerated by the blower unit 21 and fed into the drum 8 from the blowout port 25 through the blower duct 24 and the bellows tube 24a. Thereby, a circulation air passage is formed.

  Note that the positions of the air outlet 25 and the air inlet 10e of the blower unit 21 may be reversed, and the direction of the air flowing through the circulation air passage may be reversed. That is, an air inlet is provided at the upper part of the outer tub 10 to suck in air, and a blower outlet is provided at the back of the outer tub 10 to blow into the drum 8. At this time, by making the bottom surface (rear side) of the drum 8 have a mesh structure, the air blown from the back surface of the outer tub 10 can be sent into the inside through the bottom surface of the drum 8. Thereby, it becomes possible to blow air from behind the drum 8 to the laundry. Moreover, since it blows toward the front surface of the housing | casing 3, the water | moisture content adhering to the door 2 or the door bellows 11 becomes easy to dry.

  A control device 60 for controlling the drum motor 9, the fan motor 22, the fan heater 23 and the like is provided at the lower part of the drum type washing and drying machine 1.

  FIG. 3 is a perspective view of the outer tub cover 100 including a partial cross section cut along the line AA in FIG. 1 and shows a state in which the door 2 is closed. When the door 2 is closed, the front opening 101 is closed, and the door bellows 11 fills the gap between the door 2 and the outer tank cover 100, so that the water tightness in the outer tank 10 is maintained. The door bellows 11 is generally made of an elastic material so that the door 2 and the outer tub cover 100 can be sealed with water, and is also made of rubber in this embodiment. Thereby, when the door 2 is closed, the door bellows 11 is deformed according to the shape of the door 2 to fill the gap, and the outer tub 10 can be sealed with water.

  FIG. 4 is a partially enlarged cross-sectional view corresponding to a portion B in FIG. As shown in FIG. 4, the door bellows 11 exhibits an anti-vibration effect that absorbs vibration during operation due to the structure having a bent portion. In the present embodiment, two portions are bent from the connection portion 11 a with the outer tank cover 100 and connected to the opening of the housing 3. Further, there is a facing surface 11b provided so as to face the door 2 when the door 2 is closed, and the door 2 comes into contact with the surface 11b and is sealed with water. The door bellows exposed surface 111 formed between the connecting portion 11a and the facing surface 11b is a surface where the door bellows 11 is exposed in the outer tub 10, and the air in the outer tub 10 when the door 2 is closed. It is the part that touches. That is, it is the door bellows part located in the space side enclosed by the door 2 and the outer tank 10 and sealed watertight. The door bellows exposed surface 111 was subjected to an antifouling process so that dirt such as yarn waste, which will be described later, is difficult to adhere.

≪Anti-fouling treatment of door bellows 11≫
Below, the detail of the process given to the door bellows 11 surface implemented by this invention is demonstrated. In the present invention, the surface 111 exposed inside the tank of the door bellows 11 is subjected to a surface roughness treatment of Ra 7 μm with an average surface roughness to give the bellows surface an extremely fine uneven shape. The average roughness of the irregularities is not limited to Ra 7 μm. Ra is preferably in the range of 4 μm to 10 μm in order to obtain a certain effect of suppressing the adhesion and accumulation of lint as compared to a door bellows that is not subjected to the graining treatment. When Ra is smaller than 7 μm, it becomes substantially the same as when the uneven shape is not provided, and lint tends to adhere. Further, when Ra is larger than 10 μm, dust or the like enters the concave portion having the concave and convex shape, and is easily contaminated. Therefore, a door bellows having a surface average roughness of Ra 4 μm to 10 μm is most difficult to attach and deposit lint and has the effect of this processing.

  The door bellows 11 is made of, for example, urethane resin for the purpose of suppressing deterioration due to rubber friction and preventing water leakage and reducing the friction between the door 2 and the door bellows 11 and making the door opening / closing operation comfortable. In some cases, a coating mainly containing fluorine is used. The door bellows exposed surface (exposed surface in the tank) 111 may be coated on the coating agent after mixing a particulate material having a surface roughness Ra of 4 μm to 10 μm after coating. Thereby, even if it does not give the said texturing process, the uneven | corrugated shape which has the effect which suppresses lint attachment can be given to the surface of the door bellows 11 similarly to the case where the texturing process is performed. As the particulate material to be mixed with the coating agent, a water-soluble substance that does not easily precipitate in the coating liquid upon coating application, for example, a substance such as silica is preferable. In addition, in order to improve watertightness, the coating part which does not mix a particulate material is apply | coated to the connection part (contact surface) 11a and the opposing surface 11b. In this case, since the coating agent applied to the door bellows exposed surface 111 and the connecting portion 11a and the opposing surface 11b is the same, there is no need to worry about the compatibility of the coating agent.

  Even in the case of performing the conventional coating for reducing friction, in which the particulate material is not mixed with the coating agent, in the bellows subjected to the grain treatment, the surface roughness after the coating results in the above-mentioned. If the roughness is Ra 4 μm to 10 μm, there is an effect of similarly suppressing lint adhesion.

  However, Ra outside the above range may be employed within a range where the effect of making it difficult for lint to adhere is obtained. What is important in this embodiment is that the door bellows exposed surface 111 has a surface roughness that makes it difficult for lint to adhere, and the connection portion 11a and the facing surface 11b have a surface roughness that is suitable for maintaining or improving watertightness. is there. For this purpose, the surface roughness Ra of the door bellows exposed surface 111 is different from the surface roughness Ra of the connecting portion 11a and the facing surface 11b.

≪Principle to suppress adhesion≫
Below, the principle by which adhesion of yarn waste etc. is suppressed is demonstrated.

  When the clothes in the tank are agitated by the rotation of the drum tank 8 during the drying operation, the clothes rub against each other, and a large amount of yarn waste and fiber waste derived from the clothes are generated in the space in the tank. The rubber door bellows 11 has the property that the viscosity of the rubber and the oil contained in the material have an adhesive force to attract the substance, and the yarn waste and fiber waste generated in the tank are easily attached. For this reason, the lint that has come into contact with the door bellows during the drying operation adheres to the bellows, and remains after the operation, so that cleanliness cannot be maintained.

  Then, when the process which gives the said uneven | corrugated shape to the door bellows 11 surface is performed, compared with the case where a process is not performed, the contact surface area of a thread waste and a bellows becomes small. As a result, the viscosity of the rubber of the door bellows 11 and the adhesive force derived from the oil contained in the rubber material weaken the force of attracting the lint, and the force of the rubber of the door bellows 11 holding the lint on the surface becomes weak. .

  When the drum 8 is rotated, wind is generated by the garment, which is a laundry, swaying in the tub. Moreover, the wind generated by the blower unit 21 also flows in the tank. When the drying operation is performed in a state in which the surface of the door bellows 11 is processed to have a concavo-convex shape, these winds flow around the door bellows 11, so that even if yarn waste comes into contact with the door bellows 11, Because it is blown off, it is difficult to adhere to the door bellows 11. Moreover, even if it once adheres to the door bellows 11, if a certain amount of yarn waste accumulates, the wind resistance increases and is easily peeled off, and the yarn waste does not easily remain on the door bellows 11. Therefore, the door bellows 11 is less likely to become dirty by performing a process for forming an uneven shape on the surface of the door bellows 11.

  The lint that has not adhered to the door bellows 11 is accumulated in the gap 200 between the drum 8 and the outer tub cover 100 or in the space 200 formed between the outer tub cover 100 and the bent portion of the door bellows 11. Through the drain hole 202 provided in the lower part of the outer tub cover 100 (see arrow 201 in FIG. 4), and caught by the drying filter 20 for collecting lint at the tip of the drying duct 18. Or, when the humid air in the tank during the drying process is exhausted to the outside, it is exhausted along the exhaust path together with the humid air. In order to discharge the yarn waste that has not adhered to the door bellows 11 from the door bellows 11, in addition to the drain hole 202, a hole for discharging the yarn waste of Patent Document 1 described in the background art may be provided. Even in a conventional door bellows without an uneven shape, lint attached to the door bellows may be peeled off by the wind generated in the tank, but the gap 203 between the door bellows and the door glass 2 or the bending of the door bellows. In the shape portion 200, the wind stagnate and the air flow was slow, and lint was easy to accumulate.

  Although it seems that lint tends to adhere to the surface of the door bellows 11 surface, the average roughness of the surface unevenness of the door bellows 11 surface is small compared to the average overall length of lint generated from clothing. The lint does not get caught in the gap between the irregularities, and the amount of lint attached does not increase.

  In addition, most of the lint that adheres during drying adheres to the door bellows exposed surface 111 due to the viscosity of water droplets that adhere to the exposed surface (surface) 111 of the door bellows 11 during the drying process. The water droplets that cause lint adherence are caused when the washing water or rinsing water splashed in the tank during the washing process remains on the door bellows exposed surface 111 until the drying process, or when the humidity in the tank rises during the drying operation. This is caused by condensation on the door bellows exposed surface 111. For this reason, during the drying process, if there are water droplets on the door bellows exposed surface 111 even after the yarn waste is generated in the space in the tank, the yarn waste is not removed regardless of whether the door bellows exposed surface 111 has a fine uneven shape. Adhere to bellows.

  The lint that has once adhered through the water droplets on the door bellows exposed surface 111 continues to remain on the door bellows exposed surface 111 even after the drying process proceeds and the moisture on the door bellows exposed surface 111 dries. However, if the door bellows exposed surface 111 has a fine concavo-convex shape, the adhesive force to the door bellows, which is a factor that the yarn waste remains on the door bellows exposed surface 111, is weakened, and the yarn waste once adhered is peeled off.

  In addition, during drying, the faster the wind speed of the fan that blows on the clothes, the faster the airflow generated in the tank. As a result, lint is less likely to adhere to the door bellows, and lint that has once adhered tends to peel off. . If there is an air passage that blows wind directly toward the door bellows 11, the yarn dust adhesion suppressing effect due to the uneven shape of the door bellows exposed surface 111 is further improved. In addition, the longer the time from when the water droplets on the door bellows exposed surface 111 are dried during the drying process until the clothes are dried and the drying operation is completed, that is, the longer the time the wind blows on the lint attached to the door bellows 11, The opportunity for the wind to peel off lint increases the lint, and lint is less likely to remain.

≪About processed parts≫
The antifouling process is preferably performed on the door bellows exposed surface 111 that is in contact with at least the air in the outer tub 10 when the door 2 is closed. In addition, if the process which gives uneven | corrugated shape to the contact surface with the door 2 is performed, a fine clearance gap may be made in the contact surface of the door 2 and the door bellows 11, and there exists a possibility that watertightness may fall. Therefore, the antifouling process applied to the door bellows 11 is preferably not performed on the contact surface with the door 2 but on the surface of the door bellows 11 excluding the contact surface. Moreover, it is not necessary to process the back side of the door bellows 11 that does not come into contact with the laundry, that is, the surface exposed to the air between the outer tub 10 and the housing 3.

  On the other hand, the concavo-convex shape for preventing the lint from remaining is not limited to the door bellows 11 and can exhibit the same effect in other locations. For example, the lint generated in the drying process tends to adhere to the inner surface of the rubber bellows pipe 18a connecting the drying duct 18 and the outer tub 10. By giving the concave and convex shape to the inner surface of the bellows tube 18a, the lint attached to the inner surface of the bellows tube 18a can be easily peeled off, and the cleanliness can be maintained as in the case where the door bellows 11 is processed. Further, the bellows tube 24a connected to the blowout port 25 may be provided with a concavo-convex shape, and the processing of this embodiment may be performed on a circulation air path other than the bellows structure in which yarn waste is likely to accumulate.

  In the present embodiment, the drum type washing / drying machine has been described as an example, but the present invention can also be applied to a vertical washing machine or a clothes drying machine.

  According to the Example which concerns on this invention, adhesion of the yarn waste to a door bellows is suppressed. Moreover, even if lint adheres to the door bellows, lint is easily peeled off by wind generated in the tub due to air blowing during the drying process or movement of the laundry, and therefore it is difficult to remain attached. As a result, the door bellows surface can be kept clean. Furthermore, it is possible to prevent other dirt from adhering through lint such as mud dirt and oil dirt. For this reason, it is possible to keep the door bellows clean, reduce the trouble of cleaning the door bellows, and prevent lint from moving from the door bellows to the laundry when the laundry is taken out.

  In addition, this invention is not limited to each above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations.

DESCRIPTION OF SYMBOLS 1 Drum type washing and drying machine 2 Door 3 Case 3a Laundry input port 8 Drum 8a Opening part 10 Outer tub 10e Inlet 11 Door bellows 11a Connection part (contact surface) with the outer tub cover in the door bellows 11
11b Contact portion of the door bellows 11 with the door 2 (contact surface)
18 Drying duct 18a Bellows tube 21 Blower unit 24 Blower duct 24a Bellows tube 25 Outlet 100 Outer tank cover 101 Front side opening 111 Door bellows exposed surface 200 Door bellows bent shape portion 202 Drain hole 203 Door bellows-door glass gap space

Claims (5)

An outer tub that is supported in the housing and stores washing water therein, an inner tub that is rotatably supported in the outer tub and accommodates laundry, a drive device that rotationally drives the inner tub, and the housing A laundry input port provided in the body, a door provided in the laundry input port so as to be openable and closable, and when the door is closed, the door and the outer tub are sealed in a watertight manner in contact with the door. In a drum-type washing machine with a door bellows to stop,
The surface average roughness of the contact portion of the door bellows with the door, and the surface average roughness of the door bellows portion located on the space side that is surrounded by the door and the outer tub and is watertightly sealed from the contact portion. A drum-type washing machine characterized by different In the drum type laundry according to claim 1,
A drum-type washing machine configured to execute a drying process in which warm air is blown into the inner tub to dry laundry. In the drum type washing machine according to claim 2,
A drum-type washing machine, wherein a surface average roughness of a door bellows portion located on the inner side of a watertight sealed space is larger than a surface average roughness of the contact portion. In the drum type washing machine according to claim 3,
A drum-type washing machine, characterized in that an uneven shape that realizes the average surface roughness is provided on a surface of the door bellows portion located on the inner side of a space that is sealed watertight. In the drum type washing machine according to claim 4,
The drum-type washing machine, wherein the contact portion is an unprocessed region having the uneven shape.

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