JP2011045513A - Drum type washing machine - Google Patents

Drum type washing machine Download PDF

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JP2011045513A
JP2011045513A JP2009196214A JP2009196214A JP2011045513A JP 2011045513 A JP2011045513 A JP 2011045513A JP 2009196214 A JP2009196214 A JP 2009196214A JP 2009196214 A JP2009196214 A JP 2009196214A JP 2011045513 A JP2011045513 A JP 2011045513A
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drum
type washing
washing machine
bottom wall
washing
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JP5260448B2 (en
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Shunsuke Nakamura
俊介 中村
Mikio Kurosawa
幹夫 黒澤
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Hitachi Appliances Inc
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Hitachi Appliances Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum type washing machine for improving detergency. <P>SOLUTION: The drum type washing machine includes a rotary drum for housing clothes, a plurality of lifters provided on the outer peripheral wall of the rotary drum, an outer tub for housing the rotary drum and accumulating water, a motor for driving the rotary drum, and a casing for supporting the outer tub. A plurality of raised parts radially extending from the center are provided on the bottom wall of the rotary drum, and a plurality of projections in a projected shape are provided on the flat part of the bottom wall. Thus, since the clothes raked up by the lifters by the rotation of the rotary drum rub each other with the projections in the projected shape, the effect of removing dirt is improved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ドラム式洗濯機において、洗濯時の洗浄力向上に関するものである。   The present invention relates to an improvement in detergency during washing in a drum type washing machine.

ドラム式洗濯機は、例えば、特開２００８−１２５８０４号公報（特許文献１）に示すような構成を有する。   A drum type washing machine has a structure as shown in Unexamined-Japanese-Patent No. 2008-125804 (patent document 1), for example.

このドラム式洗濯機は、洗濯物を収納する回転ドラムと、回転自在なる回転ドラムを内置するところの洗濯水を溜める外槽と、洗濯内槽を回転駆動する駆動モータと、外槽を防振支持する防振機構を有する。   This drum type washing machine has a rotating drum for storing laundry, an outer tub for storing washing water in which a rotatable rotating drum is placed, a drive motor for rotationally driving the inner washing tub, and a vibration isolation for the outer tub. It has an anti-vibration mechanism to support it.

回転ドラムは、円筒状の胴体と、胴体の後端側の底壁と、前記胴体の前側端側に設ける前側補強リングと、前側補強リングに支持される環状の流体バランサ等を有する。   The rotating drum includes a cylindrical body, a bottom wall on the rear end side of the body, a front reinforcing ring provided on the front end side of the body, an annular fluid balancer supported by the front reinforcing ring, and the like.

また、特開２００５−３３４５６５号公報（特許文献２）に示すドラム式洗濯機では、洗いむらを低減するために、回転ドラムの内周に洗濯物を掻き揚げるリフタを等間隔で配置し、このリフタ間にリフタの高さより低い丈の小リフタを設けている。   Further, in the drum type washing machine disclosed in Japanese Patent Application Laid-Open No. 2005-334565 (Patent Document 2), in order to reduce washing unevenness, lifters for lifting the laundry on the inner periphery of the rotating drum are arranged at equal intervals. A small lifter with a length lower than the height of the lifter is provided between the lifters.

また、特開２００５−２５３５６７号公報（特許文献３）に示すドラム式洗濯機では、洗濯物の偏りをなくし攪拌が十分になされるように、回転ドラムの底面に回転部材を設け、該回転部材に複数の突起体を設けている。   Further, in the drum type washing machine disclosed in Japanese Patent Application Laid-Open No. 2005-253567 (Patent Document 3), a rotating member is provided on the bottom surface of the rotating drum so as to eliminate the unevenness of the laundry and allow sufficient stirring, and the rotating member A plurality of protrusions are provided on the surface.

特開２００８−１２５８０４号公報JP 2008-125804 A 特開２００５−３３４５６５号公報JP 2005-334565 A 特開２００５−２５３５６７号公報JP 2005-253567 A

ドラム式洗濯機における衣類に付着した汚れを洗浄する場合、衣類に機械力を与えて機械力による洗浄方法が行われるので、洗浄の具合は回転ドラムの内径の大小に大きく左右される。   When cleaning dirt adhered to clothes in a drum type washing machine, a mechanical force is applied to the clothes and a cleaning method using the mechanical force is performed. Therefore, the degree of cleaning greatly depends on the inner diameter of the rotating drum.

すなわち、ドラム式洗濯機の場合、衣類は回転ドラムの内側に複数個のリフタを設け回転ドラムの回転により衣類を掻き揚げ回転ドラム内径の最大高さから衣類を落下させて衣類に機械力を与えて洗濯する洗浄方式であり、衣類の汚れを良く落すには、回転ドラムの内径を大きくすることが必要であった。   That is, in the case of a drum-type washing machine, a plurality of lifters are provided on the inner side of the rotating drum, the clothes are lifted by rotating the rotating drum, the clothes are dropped from the maximum height of the inner diameter of the rotating drum, and mechanical force is applied to the clothes. In order to clean clothes well, it was necessary to increase the inner diameter of the rotating drum.

しかし、回転ドラムの内径を大きくすると必然的に洗濯機本体も大きくなり、一般住宅への設置が困難となる問題がある。   However, increasing the inner diameter of the rotating drum inevitably increases the washing machine body, which makes it difficult to install in a general house.

このため、回転ドラムの内径を大きくせずに衣類に付着した汚れを落し、かつ洗いむらも低減できる機械力を衣類に与えることが求められている。   For this reason, it is required to give the garment a mechanical force capable of removing dirt adhered to the garment without reducing the inner diameter of the rotating drum and reducing unevenness in washing.

本発明は、回転ドラムの内径を大きくせずに衣類の汚れ落ちの洗いむら低減や洗浄力の向上を図ることを目的とする。   An object of the present invention is to reduce the unevenness of washing away stains on clothes and improve the cleaning power without increasing the inner diameter of a rotating drum.

上記目的を達成するために本発明は、
衣類が収容される回転ドラムと、前記回転ドラムの内周面に設けられた複数個のリフタと、前記回転ドラムを収容し回転ドラムと同芯上に配置し洗濯用の水を溜める外槽と、前記回転ドラムを駆動するモータと、前記回転ドラムを支持する筐体とを有するドラム式洗濯機において、前記回転ドラムに前記モータ回転軸を接続する回転ドラム底壁に中央から放射状に延びる複数本の***部を有するとともに、前記底壁の平坦部には、凸形状の突起を複数個有することを特徴とする。 In order to achieve the above object, the present invention provides:
A rotating drum in which clothing is stored; a plurality of lifters provided on an inner peripheral surface of the rotating drum; an outer tub that stores the rotating drum and is disposed concentrically with the rotating drum and stores water for washing; In the drum type washing machine having a motor for driving the rotating drum and a casing for supporting the rotating drum, a plurality of radially extending from the center to the rotating drum bottom wall connecting the motor rotating shaft to the rotating drum And a plurality of convex protrusions on the flat portion of the bottom wall.

本発明によれば、回転ドラムが回転すると、リフタにより掻き揚げられた衣類は底壁の突起と擦れ合いながら持ち上げられ、また、落下するときにも底壁の突起と擦れ合いながら落下する。これにより、落下による叩き洗いの効果だけでなく、擦り洗いの効果も得られ、衣類の汚れ落ちの効果が向上する。   According to the present invention, when the rotating drum rotates, the clothes that are lifted up by the lifter are lifted while rubbing against the protrusions on the bottom wall, and also fall while rubbing against the protrusions on the bottom wall. As a result, not only the tapping effect by dropping but also the effect of scrubbing can be obtained, and the effect of removing dirt from clothes is improved.

本発明のドラム式洗濯乾燥機を示す外観図である。It is an external view which shows the drum type washing-drying machine of this invention. 本発明のドラム式洗濯乾燥機の内部構造を示す側面図である。It is a side view which shows the internal structure of the drum type washing-drying machine of this invention. 本発明のドラム式洗濯乾燥機の内部の構造を示すために洗濯兼脱水槽，外槽，モータを含む洗濯乾燥本体ユニットを示した図である。FIG. 2 is a view showing a washing / drying main unit including a washing / dehydrating tub, an outer tub, and a motor in order to show the internal structure of the drum type washing / drying machine of the present invention. 本発明のドラム式洗濯乾燥機の洗濯兼脱水槽を前後方向の略中央部で縦に切断して底壁面を示す断面図である。It is sectional drawing which cut | disconnects the washing | cleaning and dehydration tank of the drum type washing-drying machine of this invention vertically at the approximate center part of the front-back direction, and shows a bottom wall surface. 本発明のドラム式洗濯乾燥機の洗濯兼脱水槽を前後方向の略中央部で縦に切断して底壁面を示す断面図である。It is sectional drawing which cut | disconnects the washing | cleaning and dehydration tank of the drum type washing-drying machine of this invention vertically at the approximate center part of the front-back direction, and shows a bottom wall surface. 本発明のドラム式洗濯乾燥機の洗濯兼脱水槽を前後方向の略中央部で縦に切断して底壁面を示す断面図である。It is sectional drawing which cut | disconnects the washing | cleaning and dehydration tank of the drum type washing-drying machine of this invention vertically at the approximate center part of the front-back direction, and shows a bottom wall surface. 本発明のドラム式洗濯乾燥機の洗濯兼脱水槽を前後方向の略中央部で縦に切断して底壁面を示す断面図である。It is sectional drawing which cut | disconnects the washing | cleaning and dehydration tank of the drum type washing-drying machine of this invention vertically at the approximate center part of the front-back direction, and shows a bottom wall surface. 本発明のドラム式洗濯乾燥機の洗濯兼脱水槽を前後方向の略中央部で縦に切断して底壁面を示す断面図である。It is sectional drawing which cut | disconnects the washing | cleaning and dehydration tank of the drum type washing-drying machine of this invention vertically at the approximate center part of the front-back direction, and shows a bottom wall surface.

以下、本発明の一実施について、図面を用いて説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１は本発明の一実施の形態例に係るドラム式洗濯乾燥機の外観図である。図２は内部の構造を示す側面図、図３は内部の構造を示すために洗濯兼脱水槽，外槽，モータを含む洗濯乾燥本体ユニットを示した図である。   FIG. 1 is an external view of a drum type washing / drying machine according to an embodiment of the present invention. FIG. 2 is a side view showing the internal structure, and FIG. 3 is a view showing a washing / drying main unit including a washing / dehydrating tub, an outer tub, and a motor to show the internal structure.

１は、外郭を構成する筐体である。筐体１は、ベース１ｈの上に取り付けられており、左側板１ａ，右側板（図示せず），前面カバー１ｃ，背面カバー１ｄ，上面カバー１ｅ，下部前面カバー１ｆで構成されている。左右の側板１ａ，１ｂは、コの字型の上補強材（図示せず），前補強材（図示せず），後補強材（図示せず）で結合されており、ベース１ｈを含めて箱状の筐体１を形成し、筐体として十分な強度を有している。   Reference numeral 1 denotes a housing constituting the outer shell. The housing 1 is mounted on a base 1h, and includes a left side plate 1a, a right side plate (not shown), a front cover 1c, a back cover 1d, a top cover 1e, and a lower front cover 1f. The left and right side plates 1a and 1b are connected by a U-shaped upper reinforcing material (not shown), a front reinforcing material (not shown), and a rear reinforcing material (not shown), and include a base 1h. A box-shaped housing 1 is formed and has sufficient strength as a housing.

９は、前面カバー１ｃの略中央に設けた衣類を出し入れするための投入口を塞ぐドアで、前補強材に設けたヒンジで開閉可能に支持されている。ドア開放ボタン９ｄを押すことでロック機構（図示せず）が外れてドアが開き、ドアを前面カバー１ｃに押し付けることでロックされて閉じる。前補強材は、後述する外槽の開口部と同心に、衣類を出し入れするための円形の開口部を有している。   9 is a door which closes the insertion port for putting in and taking out the clothes provided in the approximate center of the front cover 1c, and is supported by the hinge provided in the front reinforcement material so that opening and closing is possible. When the door opening button 9d is pressed, the lock mechanism (not shown) is released to open the door, and when the door is pressed against the front cover 1c, the door is locked and closed. The front reinforcing member has a circular opening for putting clothes in and out concentrically with an opening of the outer tub described later.

６は、筐体１の上部中央に設けた操作パネルで、電源スイッチ３９，スタートスイッチ１２，操作ボタンスイッチ１３，表示器１４を備える。操作パネル６は、筐体１下部に設けた制御装置３８に電気的に接続している。   Reference numeral 6 denotes an operation panel provided in the upper center of the housing 1 and includes a power switch 39, a start switch 12, an operation button switch 13, and a display 14. The operation panel 6 is electrically connected to a control device 38 provided at the lower part of the housing 1.

３は、回転可能に支持された円筒状の洗濯兼脱水槽（回転ドラム）であり、その円筒外周壁３ｄに通水および通風のための多数の貫通孔を有し、前側端面に衣類を出し入れするための開口部３ａを設けてある。開口部３ａの外側には洗濯兼脱水槽３と一体の流体バランサ３ｃを備えている。洗濯兼脱水槽３の底壁３ｅには中心から外縁部に延びる複数本の放射状の***部３ｆが形成されている。外周壁３ｄの内側には軸方向に延びるリフタ３ｂが複数個設けてある。洗濯兼脱水槽３の回転中心軸は、水平または開口部３ａ側が高くなるように傾斜している。   3 is a cylindrical washing and dewatering tub (rotary drum) supported rotatably, and has a large number of through holes for water flow and ventilation in the cylindrical outer peripheral wall 3d, and clothes are taken in and out on the front end face. An opening 3a is provided for this purpose. A fluid balancer 3c integrated with the washing and dewatering tub 3 is provided outside the opening 3a. The bottom wall 3e of the washing and dewatering tub 3 is formed with a plurality of radial ridges 3f extending from the center to the outer edge. A plurality of lifters 3b extending in the axial direction are provided inside the outer peripheral wall 3d. The rotation center axis of the washing and dewatering tub 3 is inclined so that the horizontal or opening 3a side becomes higher.

２は、円筒状の外槽であり、洗濯兼脱水槽３を同軸上に内包し、前面は開口し、後側端面の外側中央にモータ４を取り付ける。モータ４の回転軸は、外槽２を貫通し、洗濯兼脱水槽３の底壁３ｅの中心と結合している。前面の開口部には外槽カバー２ｄを設け、外槽内への貯水を可能としている。外槽カバー２ｄの前側中央には、衣類を出し入れするための開口部２ｃを有している。本開口部２ｃと前補強材（図示せず）に設けた開口部は、ゴム製のベローズ１０で接続しており、ドア９を閉じることで外槽２を水封する。外槽２底面最下部には、排水口２ｂが設けてあり、排水ホース２６が接続している。排水ホース２６の途中には排水弁（図示せず）が設けてあり、排水弁を閉じて給水することで外槽２に水を溜め、排水弁を開いて外槽２内の水を機外へ排出する。   Reference numeral 2 denotes a cylindrical outer tub, which coaxially encloses the washing / dehydrating tub 3, opens on the front surface, and attaches the motor 4 to the outer center of the rear end surface. The rotating shaft of the motor 4 passes through the outer tub 2 and is connected to the center of the bottom wall 3 e of the washing and dewatering tub 3. An outer tub cover 2d is provided at the opening on the front surface, and water can be stored in the outer tub. In the center of the front side of the outer tub cover 2d, there is an opening 2c for taking in and out clothing. The opening provided in the main opening 2c and the front reinforcing material (not shown) is connected by a rubber bellows 10, and the outer tub 2 is sealed with water by closing the door 9. A drain port 2b is provided at the bottom bottom of the outer tub 2 and a drain hose 26 is connected thereto. A drain valve (not shown) is provided in the middle of the drain hose 26. Water is stored in the outer tank 2 by closing the drain valve and supplying water, and the drain valve is opened to drain the water in the outer tank 2 outside the machine. To discharge.

外槽２は、下側をベース１ｈに固定されたサスペンション５（コイルばねとダンパで構成）で防振支持されている。また、外槽２の上側は上部補強部材に取り付けた補助ばね（図示せず）で支持されており、外槽２の前後方向へ倒れを防ぐ。   The outer tub 2 is supported in a vibration-proof manner by a suspension 5 (consisting of a coil spring and a damper) whose lower side is fixed to the base 1h. The upper side of the outer tub 2 is supported by an auxiliary spring (not shown) attached to the upper reinforcing member, and prevents the outer tub 2 from falling in the front-rear direction.

図４は洗濯兼脱水槽３の底壁３ｅを示す縦断面図である。   FIG. 4 is a longitudinal sectional view showing the bottom wall 3 e of the washing and dewatering tub 3.

洗濯，乾燥時に洗濯兼脱水槽３を回転すると、衣類はリフタ３ｂと遠心力で外周壁３ｄに沿って持ち上がり、重力で落下するように動きを繰り返す。   When the washing and dewatering tub 3 is rotated during washing and drying, the clothes are lifted along the outer peripheral wall 3d by the lifter 3b and centrifugal force, and repeatedly move so as to fall by gravity.

リフタ３ｂによって持ち上げられる衣類は底壁３ｅの平坦部に設けられた突起３０と擦れ合う（矢印２０）。また、落下するときにも底壁３ｅの突起３０と擦れ合いながら落下する（矢印２１）。このような動きを繰り返すことにより、落下による叩き洗いの効果だけでなく、擦り洗いの効果も得られ、衣類の汚れ落ちの効果が向上する。また、洗濯中は回転ドラムが正逆回転を繰り返すため、落下による叩き洗いの効果だけでなく、擦り洗いの効果も得られ、衣類の汚れ落ちの効果が向上する。   The clothing lifted by the lifter 3b rubs against the protrusion 30 provided on the flat portion of the bottom wall 3e (arrow 20). In addition, when falling, it falls while rubbing against the protrusion 30 of the bottom wall 3e (arrow 21). By repeating such movement, not only the effect of washing by dropping but also the effect of scrubbing can be obtained, and the effect of removing dirt from clothes is improved. In addition, since the rotating drum repeats forward and reverse rotation during washing, not only the effect of tapping by dropping but also the effect of scrubbing can be obtained, and the effect of removing dirt from clothes is improved.

図５は、第１の実施例に関する洗濯兼脱水槽３底壁３ｅの突起形状の形態例であり、Ａ−Ａ断面図は、突起の断面形状を表している。本実施の形態例は、四角錐の凸形状としている突起３０ａが特徴であり、底壁３ｅに複数個並べて配置される。四角錐底部の一辺の長さＷ１は１７mmとし、高さＨ１は４mmとしている。   FIG. 5 is a form example of the protrusion shape of the bottom wall 3e of the washing and dewatering tub 3 relating to the first embodiment, and the AA sectional view shows the sectional shape of the protrusion. This embodiment is characterized by a protrusion 30a having a quadrangular pyramid shape, and a plurality of protrusions 30a are arranged side by side on the bottom wall 3e. The length W1 of one side of the bottom of the quadrangular pyramid is 17 mm, and the height H1 is 4 mm.

前記突起３０ａの前記高さＨ１は、高くするほど、洗浄効果が高まるが、底壁３ｅは板厚０.６mmのステンレス鋼鈑で絞り加工し形成しているため、形成時のステンレス鋼鈑の割れ等の加工不良が発生しないで絞り加工できる最適寸法である。また、大型のプレス金型を必要とせず形成できるため、製造設備の大幅な変更および設備投資も必要としない。後述の別の実施例についても、同様の理由にて最適寸法を決定している。   The higher the height H1 of the protrusion 30a, the higher the cleaning effect. However, the bottom wall 3e is formed by drawing with a stainless steel plate having a thickness of 0.6 mm. It is the optimum dimension that can be drawn without causing defects such as cracks. In addition, since it can be formed without the need for a large press die, it does not require a significant change in manufacturing equipment and capital investment. In other examples described later, the optimum dimension is determined for the same reason.

図６は、第２の実施例に関する洗濯兼脱水槽３底壁３ｅの突起形状の別の形態例であり、Ｂ−Ｂ断面図は、突起の断面形状を表している。本実施の形態例は、円弧線上に同心円となるリブ形状としている突起３０ｂが特徴であり、底壁３ｅに複数個一定の間隔で並べて配置されている。円弧線のリブ幅Ｗ２は６mmとし、リブ高さＨ２は３mmとしている。   FIG. 6 is another form example of the protrusion shape of the bottom wall 3e of the washing and dewatering tub 3 relating to the second embodiment, and the BB cross-sectional view shows the cross-sectional shape of the protrusion. The present embodiment is characterized by ribs 30b having concentric ribs on a circular arc line, and a plurality of protrusions 30b are arranged at regular intervals on the bottom wall 3e. The rib width W2 of the arc line is 6 mm, and the rib height H2 is 3 mm.

図７は、第３の実施例に関する洗濯兼脱水槽３底壁３ｅの突起形状の別の形態例であり、Ｃ−Ｃ断面図は、突起の断面形状を表している。本実施の形態例は、底壁３ｅにある中心から外縁部に延びる複数本の放射状の***部３ｆのある一つに対し平行となる直線上に並列となるリブ形状としている突起３０ｃが特徴であり、底壁３ｅに複数個一定の間隔で並べて配置されている。リブ幅Ｗ３は６mmとし、高さＨ３は３mmとしている。   FIG. 7 shows another example of the protrusion shape of the washing / dehydrating tub 3 bottom wall 3e according to the third embodiment, and the CC cross-sectional view shows the cross-sectional shape of the protrusion. The present embodiment is characterized by a protrusion 30c in the form of a rib parallel to a straight line parallel to one of the plurality of radial ridges 3f extending from the center of the bottom wall 3e to the outer edge. And a plurality of bottom walls 3e are arranged at regular intervals. The rib width W3 is 6 mm, and the height H3 is 3 mm.

図８は、第４の実施例に関する洗濯兼脱水槽３底壁３ｅの突起形状の別の形態例であり、Ｄ−Ｄ断面図は、突起の断面形状を表している。本実施の形態例は、半球状の凸形状としている突起３０ｄが特徴であり、底壁３ｅに複数個並べて配置される。半球状の円の直径Ｗ４は２０mmとし、高さＨ４は４mmとしている。   FIG. 8 shows another example of the protrusion shape of the bottom wall 3e of the washing / dehydrating tub 3 relating to the fourth embodiment, and the DD sectional view shows the sectional shape of the protrusion. The present embodiment is characterized by a hemispherical protrusion 30d, and a plurality of protrusions 30d are arranged side by side on the bottom wall 3e. The hemispherical circle has a diameter W4 of 20 mm and a height H4 of 4 mm.

以上、上記した実施例によれば、回転ドラムが回転すると、リフタにより掻き揚げられた衣類は底壁の突起（四角錐形状，円弧線上に同心円となるリブ形状，直線状の突起，半球状の突起）と擦れ合いながら持ち上げられ、また、落下するときにも底壁の突起と擦れ合いながら落下するので、落下による叩き洗いの効果だけでなく、擦り洗いの効果も得られ、衣類の汚れ落ちの効果が向上する。   As described above, according to the above-described embodiment, when the rotating drum rotates, the clothes swept up by the lifter have protrusions on the bottom wall (quadrangular pyramid, rib-shaped concentric circle on the arc line, linear protrusion, hemispherical It is lifted while rubbing against the protrusions, and when falling, it falls while rubbing against the protrusions on the bottom wall. The effect is improved.

１ 筐体
２ 外槽
３ 洗濯兼脱水槽
３ｂ リフタ
３ｄ 外周壁
３ｅ 底壁
３０ 突起 DESCRIPTION OF SYMBOLS 1 Case 2 Outer tub 3 Washing / dehydration tub 3b Lifter 3d Outer peripheral wall 3e Bottom wall 30 Protrusion

Claims (5)

衣類が収容される回転ドラムと、前記回転ドラムの内周面に設けられたリフタと、前記回転ドラムを収容し回転ドラムと同芯上に配置し洗濯用の水を溜める外槽と、前記回転ドラムを駆動するモータと、前記外槽を支持する筐体とを有するドラム式洗濯機において、
前記回転ドラムの底壁に中央から放射状に延びる複数本の***部を有するとともに、
凸形状とした突起を複数個有することを特徴とするドラム式洗濯機。 A rotating drum for storing clothing; a lifter provided on an inner peripheral surface of the rotating drum; an outer tub for storing the rotating drum and arranged on the same core as the rotating drum and storing water for washing; In a drum-type washing machine having a motor that drives a drum and a housing that supports the outer tub,
Having a plurality of raised portions extending radially from the center on the bottom wall of the rotating drum;
A drum-type washing machine having a plurality of protrusions having a convex shape. 請求項１記載のドラム式洗濯機において、
前記凸形状とした突起は、四角錐形状を並べて複数個有することを特徴とするドラム式洗濯機。 In the drum type washing machine according to claim 1,
The drum-type washing machine having a plurality of convex protrusions arranged in a quadrangular pyramid shape. 請求項１記載のドラム式洗濯機において、
前記凸形状とした突起は、円弧線上に同心円となるリブ形状を並べて有することを特徴とするドラム式洗濯機。 In the drum type washing machine according to claim 1,
The drum-type washing machine according to claim 1, wherein the protrusions having the convex shape have rib shapes arranged concentrically on an arc line. 請求項１記載のドラム式洗濯機において、
前記凸形状とした突起は、直線状の突起を並列に複数個並べて有することを特徴とするドラム式洗濯機。 In the drum type washing machine according to claim 1,
The drum-type washing machine according to claim 1, wherein the protrusion having a convex shape has a plurality of straight protrusions arranged in parallel. 請求項１記載のドラム式洗濯機において、
前記凸形状とした突起は、半球状の突起を複数個並べて有することを特徴とするドラム式洗濯機。 In the drum type washing machine according to claim 1,
The drum-type washing machine, wherein the protrusion having the convex shape has a plurality of hemispherical protrusions arranged side by side.
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