JP2002253893A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine capable of uniformly washing a quilt without deformation. SOLUTION: A drum for performing a washing is rotated at a rotating speed higher than the rotation speed where the centrifugal force acting on the laundry housed in the drum is substantially equilibrated to the gravity to collect the laundry to the drum inner wall side by centrifugal force, and a washing solution is supplied to the laundry to perform the washing. The washing solution is cleaning water (water with detergent dissolved therein) or general water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum-type washing machine, and more particularly, to a drum-type washing machine suitable for washing a laundry having a large volume in a dry state.

[0002]

2. Description of the Related Art Conventionally, when washing laundry such as a large futon, a large drum type washing machine installed in a cleaning shop or a large coin laundry shop is used to wash the whole futon. Was possible. However, if a Japanese futon or a mattress filled with futon cotton in a large futon skin (outer bag-like cloth) is stored in the drum as it is, the futon cotton moves in the futon skin, so-called It will be in the state of a ball. On the other hand, the present applicant has filed Japanese Patent Application No. 10-221180 (Japanese Patent Application Laid-Open No. 2000-515).
No. 63) proposes a new drum type washing machine which can solve the above problem.

[0003] In this drum type washing machine, the futon is spread and stored on the inner peripheral wall surface of the drum. Then, in a state in which the washing liquid is stored in the outer tub, the futon in the drum is accelerated to a rotation speed such that the futon in the drum sticks to the inner peripheral wall surface of the drum and rotates by centrifugal force. As a result, the washing is performed while the futon passes through the detergent water stored at the bottom of the drum while being adhered to the inner peripheral wall surface of the drum. Therefore, the futon does not roll inside the drum and the futon cotton does not move in the futon skin, so that the shape does not collapse. In addition, there is no need to further perform the work of washing the futon into a shape in which the futon is wound into a roll, which is advantageous in that the labor of washing the futon can be greatly reduced.

[0004]

Generally, clothes such as cotton, and laundry such as futons and blankets have greatly different volumes in a dry state and a wet state. When dry, there are many air layers in the fibers inside, so the fibers expand and the volume of the entire laundry increases. On the other hand, when moisture is absorbed, the volume of the laundry is reduced because the air layer in the fiber is reduced.

In the drum type washing machine as described above,
When the laundry is stored in the drum at the start of the laundry, the laundry before the laundry is in a swollen state containing a lot of air because the laundry is not wet with water. Therefore, since the volume (thickness) of the laundry is large, the laundry becomes bulky and may be blocked by the laundry up to the vicinity of the center in the drum.

[0006] For this reason, the swollen laundry blocks the washing liquid flowing near the center of the drum, and the washing liquid is supplied only to a part of the laundry arranged in the drum, so that the washing liquid is uniformly distributed. There is a possibility that the washing may be uneven, or that the liquid cannot be supplied quickly, resulting in insufficient washing.

Further, when laundry that is not wet with water is stacked and stored in a drum, a gap is formed in a portion where the laundry overlaps with the laundry, so that an air layer is sometimes formed in the gap.

For this reason, the air inside the laundry or the air layer remaining in the gap between the laundry and the laundry hinders the passage of the washing liquid from the inside to the outside of the laundry, which is difficult. There was a risk of uneven washing.

[0009] The above-mentioned inconvenience is particularly noticeable in laundry having a large volume when dried, such as a futon or a blanket.

[0010] The present invention has been made in view of such a point, and it is possible to wash laundry (such as futons) whose volume easily changes between drying and washing without loss of shape and evenly. It is to provide a drum type washing machine that can be used.

[0011]

A drum-type washing machine according to a first aspect of the present invention, which has been made to solve the above problems, has an outer tub for storing a washing liquid, and an inner portion of the outer tub. A drum rotatably disposed about a horizontal axis or an inclined axis, a motor for driving the drum to rotate, a liquid supply means for supplying laundry to the laundry in the drum, and the liquid supply means And a drive control means for driving and controlling the motor to rotate the laundry after liquid supply at a first drum rotation speed to perform washing, wherein the operation control means comprises: Rotating the drum at a second drum rotation speed higher than the drum rotation speed and higher than the rotation speed at which the centrifugal force and gravity acting on the laundry stored in the drum are substantially balanced, The laundry is centrifugally applied to the inner peripheral wall of the drum. After asked, it is characterized by performing the liquid supply to the laundry to perform the washing.

When the drum type washing machine is for washing with water, the washing liquid is washing water (water in which a detergent is dissolved) or ordinary water, and the washing liquid is a solvent (petroleum-based). In the case where washing is performed using a solvent, the washing liquid is a solvent in which soap is dissolved or not dissolved.

In this drum type washing machine, before washing the laundry, that is, when the user stores the unwashed dry laundry (such as a futon) in the drum, the laundry is supplied by liquid supply into the outer tub. The drum rotates at a high speed at the second drum rotation speed before the object gets wet with the washing liquid. That is, when the drum is accelerated from a stopped state to a high-speed rotation, the laundry in the drum is pressed against the inner peripheral wall of the drum by centrifugal force and rotated. For this reason, the laundry that has been expanded and contains a large amount of air and has a thickness is pressed to the inner peripheral surface of the outer tub by centrifugal force, so that the thickness is appropriately reduced.

[0014] Further, the gap generated by the laundry being overlapped with each other is removed by the pressing force due to the centrifugal force. As a result, the laundry that has reached the center of the drum can be pushed strongly toward the outer periphery of the drum. In other words, a space for allowing the washing liquid to flow near the center of the drum is semi-forced by the centrifugal force generated by rotating the drum at a high speed before the liquid is supplied to the laundry.

When the high-speed rotation of the drum is completed, the supply of the washing liquid into the outer tub (drum) is started, and the drum is rotated at the first drum rotation speed to wash the laundry. Is

As described above, by performing high-speed rotation of the drum before liquid supply, a space for liquid supply is formed near the rotation axis of the drum. The washing liquid is not interrupted, and the washing liquid is supplied to the laundry from the beginning of the liquid supply, so that the washing liquid is quickly absorbed by the entire laundry.

By supplying the washing liquid into the drum from the vicinity of the center of the drum, the supply of the washing liquid is not easily interrupted even if the amount of compression of the laundry by the centrifugal force is small. The effect can be further enhanced.

Further, with the washing liquid stored in the outer tub,
When the laundry contained in the drum is rotated at a drum rotation speed such that the laundry stored in the drum is attached to the inner wall of the drum-side peripheral surface and the laundry is rotated, the above-described second drum rotation speed is: Since the rotation speed is higher than the drum rotation speed at the time of washing, if the liquid is supplied at this rotation speed, a problem such as splashing of the washing liquid may occur. After the above-described high-speed rotation of the drum, the rotation of the drum is reduced to the number of rotations at which the washing is performed, and then the washing liquid is supplied into the outer tub to perform the washing.

At the time of washing, the laundry adheres to the inner peripheral surface of the drum side and rotates by centrifugal force. The washing liquid supplied to the outer tub is jetted into the inside of the drum from the clothing input opening on the front of the drum through a gap between the front edge of the outer tub and the front edge of the drum. The spouted washing liquid is sprinkled on the inner peripheral surface of the laundry stuck to the inner peripheral surface of the drum side, and the centrifugal force causes the washing liquid to pass through the interior of the laundry, such as fibers and cotton, and to the outer peripheral side. It flows out to the outer tank side through the liquid passage hole on the drum side peripheral surface. Thus, when the washing liquid passes through the laundry, the dirt adhering to the laundry is peeled off and melts into the washing liquid.

Therefore, since the laundry itself does not agitate or rub against each other, the occurrence of out of shape and cloth pain is reduced. For example, even when the futon is washed, the futon cotton is not biased inside the futon skin, so that the futon cotton can be prevented from becoming a ball.

A liquid passage hole is formed in the rear end face of the drum,
By providing the liquid holding portion that covers the liquid passage hole from the outside, the washing liquid located at the rear of the drum in the outer tub enters the liquid holding portion, and the centrifugal force acts on the inside of the liquid holding portion. The washing liquid is pushed out into the inside of the drum through the liquid passage hole in the end face.

Therefore, the washing liquid sprinkles on the laundry not only from the front end side of the drum but also from the rear end side. As a result, the washing liquid is sprinkled evenly on the inner peripheral side of the laundry, uneven washing is less likely to occur, and high washing performance can be obtained.

In a conventional drum-type washing machine, at the start of washing, that is, when the user has dried laundry (such as a futon) before washing.
When the laundry is stored in the drum, the laundry that is not wet with water is swollen with a lot of air, so part or most of the water holes formed in the rear end face of the drum are closed, and the laundry is closed. There was a problem that the washing liquid supplied from the water hole into the drum was blocked. By rotating the drum at a high speed before liquid supply and pressing the laundry against the inner peripheral surface of the drum side by centrifugal force as in the present application, it is possible to secure a passage for the washing liquid introduced from the water passage hole. Since the washing liquid supplied from the rear of the drum is sufficiently spouted, uneven washing can be reduced, and the washing effect can be further enhanced.

When the rotation control of the drum is performed at the second drum rotation speed, and the eccentric load in the drum is equal to or less than a predetermined value, the operation control means increases the rotation speed of the drum to a higher target. The rotation speed is increased, and when the eccentric load exceeds a predetermined value, the rotation speed is maintained as it is. Alternatively, it is preferable to reduce the rotation speed (for example, to reduce the speed at which washing is performed).

According to this configuration, if the imbalance is detected while the drum is rotating at the second drum rotation speed for moving the laundry to the inner peripheral wall side of the drum, the unbalance is performed as in the normal spinning. Without correction, the rotation speed is maintained at the second drum rotation speed or the speed is reduced to the first drum rotation speed at which washing is performed.

That is, since the drum rotation for bringing the laundry to the inner peripheral wall side of the drum in the present application is performed before the liquid is supplied, the laundry is not wet unlike ordinary spin-drying, and effective imbalance correction cannot be performed. In addition, in the case of a laundry such as a futon, the shape of the laundry is likely to be out of shape.

Therefore, as in this configuration, when an imbalance is detected, the drum rotation speed is maintained without increasing it further. Alternatively, the drum rotation is reduced to a rotation speed at which washing is performed. By doing so, it is possible to prevent the running time of the washing operation from being prolonged, and to perform the washing in which the out of shape and the cloth pain on the laundry are surely reduced.

A drum-type washing machine according to a second aspect of the present invention, which has been made to solve the above-mentioned problems, has an outer tub for storing a washing liquid, and a horizontal axis or an inclined axis inside the outer tub. A drum rotatably disposed at the center, a motor for rotating the drum, a liquid supply means for supplying the laundry in the drum, and a drum in a state in which the washing liquid is stored in the outer tub. Operating control means for rotating the drum at a drum rotation speed to rotate the drum at a drum rotation speed such that the laundry stored in the drum sticks to the inner wall of the drum side and performs washing. The means periodically controls the third drum rotation speed such that the centrifugal force acting on the laundry stored in the drum exceeds gravity, and the fourth drum rotation speed higher than the third drum rotation speed. Controlling the rotation speed so as to perform It is set to.

That is, the third drum rotation speed is in a range where the centrifugal force acting on the laundry stored in the drum exceeds the gravity, and the drum rotates at the lowest possible rotation speed. The motor is controlled.

At the third drum rotation speed, a large amount of washing liquid is efficiently supplied to the laundry because the rotation speed of the drum is low. Can be passed over time. Therefore, the washing liquid can be spread to every corner of the inside of the laundry such as fibers and cotton, and the attached dirt can be peeled off and dissolved in the washing liquid. In addition, since the laundry does not rotate violently, the occurrence of shape loss and cloth pain is reduced as much as possible.

On the other hand, the fourth drum rotation speed is a rotation speed at which the centrifugal force acting on the laundry stored in the drum exceeds gravity, ie, a rotation speed higher than the third drum rotation speed, and The motor is controlled such that the drum rotates at a rotational speed at which the laundry can be pressed against the inner peripheral wall of the drum as strongly as possible by centrifugal force.

At the fourth drum rotation speed, the laundry is strongly pressed against the inner peripheral surface of the drum side by the centrifugal force generated by the high-speed rotation of the drum, and this pressing force is applied to the laundry supplied to the laundry. Acts to squeeze the liquid.

It is preferable that the fourth drum rotation speed is equal to or lower than the rotation speed at which the washing liquid stored in the outer tub is not repelled to the surroundings. Further, it is more preferable to set the rotation speed lower than the resonance frequency of the drum.

When the third drum rotation speed and the fourth drum rotation speed are periodically performed, the laundry is sufficiently contained in the laundry at the third drum rotation speed, and then the fourth drum rotation speed is changed. A washing method in which the washing liquid is forcibly pushed out by a strong centrifugal force due to the drum rotation speed, so-called push washing can be performed, whereby dirt attached to the laundry can be efficiently peeled off, Washing performance and rinsing performance are further improved, and sufficient cleaning performance can be exhibited.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drum type washing machine according to an embodiment of the present invention will be described below with reference to the drawings. FIG.
2 is a side sectional view showing a schematic structure of the inside of the drum type washing machine according to the present embodiment, FIG. 2 is a rear view of the drum of the drum type washing machine, and FIG. 3 is an enlarged detailed view of a portion A in FIG.

First, the internal structure of the washing machine will be described with reference to FIG. Inside the outer box 1, a substantially cylindrical outer tank 2 whose rear end surface (right side in FIG. 1) is closed is swingably supported by a spring 3 and a damper 4, and inside the outer tank 2, A drum 5 for containing laundry is supported by a main shaft 6. The main shaft 6 is rotatably supported by a bearing 7 mounted on the rear surface of the outer tub 2, and a main pulley 8 is attached to a tip of the main shaft 6. A motor 9 is provided below the outer tub 2, and the rotational driving force of the motor 9 is transmitted to the main pulley 8 via a motor pulley 10 and a V-belt 11, thereby rotating the drum 5. A door 12 is attached to the front of the outer box 1 so as to be openable and closable. When the door 12 is closed, the front opening of the outer tub 2 is closed.

A water supply pipe 13 opened and closed by a water supply valve 14 is connected to the rear surface of the outer tank 2, while a drain pipe 15 opened and closed by a drain valve 16 is connected to the bottom of the outer tank 2. . When the water supply valve 14 is opened with the drain valve 16 closed, the water supplied through the water supply pipe 13 is stored in the outer tank 2. The drum 5 has a large number of water passage holes 511 on the side peripheral surface, and the water stored in the outer tank 2 flows into the drum 5 through the water passage holes 511. After the rinsing is completed, the drain valve 16 is opened to discharge the water in the outer tub 2 to the outside through the drain pipe 15.

The drum 5 has a cylindrical body 51, a front plate 52 having a clothing input port attached to the front end surface of the body 51, and a rear plate 5 attached to the rear end surface of the body 51.
3 As shown in FIG.
In order to fix the main shaft 6 to the main shaft 3, a main shaft fixing portion 17 having three arms extending radially around the main shaft 6 is attached. As a characteristic configuration, in this drum type washing machine, a large number of water passage holes 531 are also formed on the rear face plate 53 of the drum 5 on the outer peripheral side. Further, water holding members 18 are respectively attached so as to bridge between the three arms of the spindle fixing portion 17. The water holding member 18 is a metal plate whose cross section is bent in an L shape as shown in FIG.
It is attached so as to keep a predetermined gap with the rear face plate 53. Thereby, between the water holding member 18 and the rear face plate 53 of the drum 5, the water inlet 181 that is largely opened on the inner peripheral side is provided.
Drain opening 18 having a small opening on the outer peripheral side
A pocket having two is formed. Here, the inner peripheral side edge of the water holding member 18 is processed into an arc shape of a substantially coaxial circle with the body portion 51 of the drum 5, and the outer peripheral side is formed in a linear shape to facilitate bending. It is not limited to such a shape.

FIG. 4 is a schematic diagram showing the electric system of the drum type washing machine. The control unit 20 includes a CPU, a timer, a ROM,
It is mainly configured by a microcomputer including an AM and the like, and is connected with an operation unit 21, a display unit 22, a liquid level sensor 23, a motor drive unit 24, a valve drive unit 25, and the like.
The operation unit 21 includes various switches operated by the user, and is used for performing various settings related to washing.
The display unit 22 includes a numerical display or the like, and displays a setting status, a washing progress status, and the like. The water level sensor 23 has a configuration in which a pressure sensor is connected to the other end of a pressure hose one end of which is connected near the bottom of the outer tub 2,
The liquid level in the outer tub 2 is detected by detecting the air pressure in the pressure hose when water is stored in the outer tub 2. In the control unit 20, when the CPU executes the operation program stored in the ROM in advance, the operation unit 2
An input operation signal is received from 1 and a liquid level detection signal is received from the liquid level sensor 23, and the motor drive unit 24 and the valve drive unit 25 are controlled by performing predetermined arithmetic processing.

In this drum type washing machine, a normal washing mode in which a conventional washing machine is used for slap washing of laundry and a futon washing mode in which a washing operation suitable for washing futons can be selected. Operation keys are provided on the operation unit 21. Furthermore, when the futon washing mode is selected, a thick washing mode suitable for washing thick beddings (hereinafter, simply referred to as “thick”) such as a mattress or a winter quilt, and a summer quilt or a blanket. The operation unit 21 is also provided with an operation key capable of selecting any of a thin laundry mode suitable for washing thin bedding (hereinafter, simply referred to as “thin”).

FIG. 5 is a flowchart showing a processing procedure of a washing process in the drum type washing machine, and FIG. 6 is a schematic view showing a state of the futon accommodated in the drum. The washing procedure in the washing machine of the present embodiment will be described with reference to FIG.

When washing two futons, the user can
As shown in (a), one futon 30a is accommodated while being spread along the bottom wall surface of the drum 5 and the other futon 30b is folded in the upper space in the drum 5 to a minimum. I do. At this time, the futon before washing is in a swelled state including air, and has a large volume in the thickness direction. When the user selects the futon washing mode using the operation unit 21 and further gives an instruction to start washing by selecting either the heavy laundry mode or the thin laundry mode, the control unit 20 receives this instruction and performs a predetermined operation control. Start operation according to the program.

First, the motor 9 is transmitted via the motor driving unit 24.
Is started, and the rotation speed of the drum 5 is rapidly increased to 200 rpm (step 1). The rotation speed at this time is a range in which the centrifugal force acting on the laundry (futon) in the drum 5 is larger than the gravity, and is high enough not to cause imbalance due to the dry laundry. . When the drum 5 is rapidly accelerated from the stopped state to the above-described rotation speed, the laundry in the drum 5 is quickly stuck to the inner surface of the body 51 of the drum 5 by centrifugal force and rotates integrally with the drum 5. When the drum 5 is rotated at the above rotation speed, a strong centrifugal force acts on the laundry in the drum 5 to press the laundry in the drum 5 against the inner surface of the body 51 of the drum 5 to reduce the volume of the laundry. It works to make it smaller. As a result, the laundry, which has a large amount of air and has a swelling and thickness, is appropriately thinner than a pressing force by centrifugal force,
A space is formed on the rotating shaft side of the drum 5 for passing the washing liquid.

The controller 20 controls the magnitude of the eccentric load in the drum based on a signal from an eccentric load detecting means (not shown) for detecting the magnitude of the eccentric load due to the uneven distribution of the laundry in the drum. Is determined to be less than or equal to a predetermined value (step 2),
If the eccentric load exceeds a predetermined value, the rotation speed (200 rpm) is maintained without increasing the rotation speed further (step 3).

On the other hand, if the magnitude of the eccentric load is smaller than the predetermined value in step 2, the vibration does not abnormally increase in order to further increase the pressing force acting to reduce the thickness of the laundry. Rotation speed of the order, here 4
The rotation speed of the drum 5 is increased to 00 rpm (step 4).

In either step 3 or step 4, a predetermined time (about 40 in this embodiment) from the start of the washing operation.
After the elapse of (second), the rotation of the drum is reduced to the washing rotation speed (80 or 90 rpm) described later (step 5). The washing rotation speed is such that the centrifugal force acting on the laundry in the drum 5 exceeds the gravity, and the motor is controlled so that the drum rotates at the lowest possible rotation speed. Specifically, the rotation speed at this time (hereinafter referred to as “washing rotation speed”) is 8 in the heavy laundry mode.
0 rpm, and 90 rpm in the thin laundry mode (step S6). When the drum 5 is rotated at the above rotation speed in this manner, the futon in the drum 5 sticks to the inner surface of the body 51 of the drum 5 by centrifugal force, and rotates integrally with the drum 5. Here, the reason why the rotation speed is set higher in the thin object washing mode is that the thin object is weaker in sticking to the inner surface of the body portion 51 than the thick object, and is easy to float particularly when the liquid level rises.

Thereafter, the control unit 20 opens the water supply valve 14 via the valve drive unit 25, and starts water supply into the outer tub 2 through the water supply pipe 13 (step S7). At the time of this water supply, by letting water pass through the detergent input box,
The detergent contained beforehand in the detergent input box is dissolved in water and becomes the detergent water when the water enters the outer tub 2.

The control section 20 repeatedly determines whether or not the liquid level detected by the liquid level sensor 23 has reached a predetermined level (step S8). If the level has reached the predetermined level, the water supply valve 14 is closed to supply water. It stops (step S9). The liquid level at this time is 7 to 7 in water depth (a value obtained by dividing the height from the bottom to the center of the outer tank 2 into 10 equal parts, the center is 10, and the bottom is 0).
It is set to about 9, which is higher than the washing liquid level (about 5 in water depth) during the washing operation in the normal washing mode.

Further, for a reason described later, a predetermined liquid level is changed between the thick washing mode and the thin washing mode so that appropriate washing can be executed. When the drum 5 is rotating at the washing rotation speed, as shown in FIG. 6B, the two futons 30 a and 30 b adhere to the inner surface of the body 51 of the drum 5 but are stored in the outer tub 2. Water is also pushed out of the drum 5 by centrifugal force through the water holes 511 to the outer tank 2 side,
The gap between the outer surface of the body 51 of the drum 5 and the inner surface of the body 201 of the outer tub 2 is filled over substantially the entire circumference of the drum 5. However, the gap is narrow, and water flows out further from the inside to the outside of the drum 5 by centrifugal force. Therefore, water flows forward and from the gap between the body 51 of the drum 5 and the body 201 of the outer tub 2. It wraps backward, and in front, blows out from the clothing slot into the interior of the drum 5 through the gap between the edge of the front plate 52 of the drum 5 around the clothing slot and the inside of the door 12 (see FIG. 1). ).

On the other hand, at the rear of the drum 5, the water passes through a gap between the rear plate 53 of the drum 5 and the rear plate 202 of the outer tub 2 and passes through the inlet opening 181 to the rear plate 53 of the drum 5 and the water holding member. 18 (see arrows L1 and L2 in FIG. 3), and then pressed against the bottom of the pocket by centrifugal force. Although there is a drainage opening 182 at the bottom, the amount of water that can flow out of the drainage opening 182 is much smaller than the amount of water entering from the water inlet 181, so that the water in the pocket is strong by centrifugal force. Pressure is applied. As a result, water spouts into the drum 5 through the water holes 531 provided in the rear face plate 53 of the drum 5 (see arrows L3 in FIGS. 1 and 3).

In the inside of the drum 5, two futons 30
The a and 30b rotate with the rotation thereof while being attached to the inner surface of the body portion 51 of the drum 5, and since the volume is reduced by containing water, a large space is formed on the rotating shaft side. Water spouting from the front and rear into the drum 5 just jumps into this space and falls on the inner peripheral surface of the futon. Then, the water tends to move in the outer peripheral direction due to the centrifugal force, so that the water passes through the inside of the futon, that is, the futon skin or the futon to the inner surface side of the drum portion 51 of the drum 5, and the water passing hole 5.
It scatters to the outer tub 2 through 11. When the detergent water passes through the inside of the futon, the pressure causes dirt and fine dust adhering to the futon skin and the futon cotton to be carried away. Since the water gushes from both the front and rear sides of the drum 5, the water uniformly falls on the futon, so that high washing performance can be obtained. In addition, since water circulates through a path going forward and a path going backward from the outer surface side of the drum portion 51 of the drum 5, all of the water supplied into the outer tub 2 smoothly circulates, and Used for cleaning. Accordingly, since there is no stagnation of detergent water generated in the conventional drum type washing machine, high washing performance can be achieved even if the amount of detergent used is reduced.

During the main washing, the controller 20 controls the drum 5
Is periodically varied (step 10). The periodic drive of the drum 5 includes a drum drive in which the washing rotation speed (80 rpm or 90 rpm) is maintained for about 53 seconds and a drum in which the rotation speed is maintained at about 160 rpm which is higher than the washing rotation speed for about 7 seconds. The driving is changed periodically.

When the drum 5 is rotating at the washing rotation speed, a large number of washing liquids are efficiently supplied to the laundry because the rotation speed of the drum is low. The washing liquid can be passed over a long time.

On the other hand, when the drum 5 is rotated at a rotation speed of 160 rpm, which is higher than the washing rotation speed, the laundry is strongly pressed against the inner surface of the body 51 of the drum 5 by the centrifugal force caused by the high-speed rotation of the drum. The pressing force acts to reduce the volume of the laundry and squeeze out the washing liquid supplied to the laundry.

In the above step 10, 80 rpm
(Or 90 rpm) and 160 rpm are alternately performed. Accordingly, the washing liquid is sufficiently contained in the laundry at a relatively low rotation speed of 80 rpm, and the volume of the laundry is reduced at 160 rpm where a strong centrifugal force is generated to push the washing liquid out of the laundry. The laundry is pushed and washed.

As a result, the dirt adhering to the laundry can be efficiently peeled off, and the washing performance and the rinsing performance can be further improved, and a sufficient cleaning performance can be exhibited.

In this embodiment, the rotation speed at which a high centrifugal force is generated is set to 160 rpm. However, as long as the rotation speed is not higher than the rotation speed at which the washing liquid stored in the outer tub is not excessively discharged to the surroundings, A higher rotation speed is preferred. Further, it is more preferable to set the rotation speed lower than the resonance frequency of the drum because large vibration of the drum 5 can be prevented beforehand.

When the drum 5 has been periodically driven and a predetermined washing time has elapsed ("Y" in step S11), the drain valve 1 is kept rotating while the drum 5 continues rotating.
6 is released (step 12). Thereby, the detergent water in the outer tub 2 is discharged to the outside, and the washing operation is completed. Thereafter, if an appropriate time has elapsed since the drain valve 16 was opened, the rotation speed of the drum 5 is increased to perform intermediate dewatering, and the detergent water seeping into the futons 30a and 30b is scattered. Then, the first rinsing is performed in the same manner as the processing in steps S6 to S12, and after repeating this three times,
The final dehydration is performed by increasing the rotation speed of the drum 5 to the maximum dehydration rotation speed. In the disclosure of the rinse, since the laundry is already wet, it is not necessary to perform the drum rotation for compressing the laundry as in steps S1 to S5 performed during washing,
The processing of steps S1 to S5 is performed only at the time of washing.

Thus, the drum 5 always keeps rotating in the same direction from the start of the washing operation to the end of the final dehydration, and the rotation speed is maintained within a range where the centrifugal force acting on the laundry exceeds the gravity. Is done. Therefore, initially, the futon 30 adhered to the inner surface of the body 51 of the drum 5 by centrifugal force.
The a and 30b do not come off from the inner wall until the end, and the duvet does not shift. The water remaining in the pocket formed by the rear plate 53 of the drum 5 and the water holding member 18 is completely discharged through the drainage opening 182 (FIG. 3).
(Refer to the arrow L4 in the middle.) At that time, dust such as thread waste mixed in the water also flows out, so that there is no accumulation at the bottom of the pocket.

In the above embodiment, a motor 9 is provided below the outer tub 2, and the rotational driving force of the motor 9 is applied to the drum 5 via the motor pulley 10, the V-belt 11 and the main pulley 8.
Is rotated, but the present invention is not limited to this. For example, a so-called DD motor in which a motor is arranged on a rotating shaft of a drum may be used. By doing so, the vibration of the drum is reduced, and the high-speed rotation of the drum for compressing the laundry to be performed before the above-mentioned washing can be made higher, so that the laundry can be compressed well, More effective.

The above embodiment is merely an example,
Obviously, changes and modifications can be made within the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a drum type washing machine according to an embodiment of the present invention.

FIG. 2 is a rear view of the drum of the drum type washing machine according to the embodiment.

FIG. 3 is an enlarged detailed view of a portion A in FIG. 1;

FIG. 4 is a schematic configuration diagram of an electric system of the drum type washing machine according to the embodiment.

FIG. 5 is a flowchart showing a procedure of a washing process in the drum type washing machine according to the embodiment.

FIG. 6 is a schematic diagram showing a state of a futon accommodated in a drum in the drum type washing machine according to the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Outer box 2 ... Outer tub 201 ... Trunk part 202 ... Rear plate 5 ... Drum 51 ... Trunk part 511, 531 ... Water hole 52 ... Front plate 53 ... Rear plate 6 ... Main shaft 7 ... Bearing 8 ... Main pulley 9 ... Motor 10 ... Motor pulley 11 ... V belt 12 ... Door 13 ... Water supply pipe 14 ... Water supply valve 17 ... Spindle fixing part 18 ... Water holding member 181 ... Water inlet opening 182 ... Drain opening 20 ... Control unit 21 ... Operation unit 22 ... Display unit 23 ... Liquid level sensor 24 ... Motor drive unit 25 ... Valve drive unit

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Isao Chishun 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. In-house F-term (reference) 3B155 AA01 AB02 BB08 CA02 DC18 FA02 KA02 KA07 LA03 LB18 MA01 MA02 MA03 MA08

Claims (6)

[Claims] An outer tub for storing a washing liquid; a drum rotatably disposed inside the outer tub about a horizontal axis or an inclined axis; a motor for rotating the drum; A liquid supply unit for supplying a washing liquid to the laundry in the drum, and an operation control for driving and controlling the motor to perform the laundry by rotating the laundry after the liquid supply by the liquid supply unit at a first drum rotation speed. A drum-type washing machine comprising: means for rotating the operation control means at a speed higher than the rotation speed of the first drum and in which the centrifugal force and the gravity acting on the laundry stored in the drum are substantially balanced. Rotating the drum at a second drum rotation speed higher than the speed, bringing the laundry in the drum to the drum inner peripheral wall side by centrifugal force, and then supplying the laundry with liquid for washing. Drum type washing machine. 2. The motor control device according to claim 1, wherein the first control unit controls the motor so that the first drum rotation speed is such that the laundry stored in the drum is attached to the inner peripheral surface of the drum and rotated. 2. The drum-type washing machine according to claim 1, wherein the washing is performed in a state where the drive is controlled and the washing liquid of a predetermined level is stored in an outer tub. 3. The drum type washing machine according to claim 1, wherein the liquid supply means supplies the washing liquid into the drum from near the center of the drum. 4. An eccentric load detecting means for detecting a magnitude of an eccentric load due to an eccentric distribution of the laundry in the drum, wherein the operation control means controls the rotation of the drum at the second drum rotation speed. When the eccentric load in the drum is equal to or less than a predetermined value, the rotation speed of the drum is increased to a higher target rotation speed, and when the eccentric load exceeds the predetermined value,
The drum type washing machine according to claim 1, wherein the drum rotation speed is maintained or reduced. 5. An outer tub for storing a washing liquid, a drum disposed inside the outer tub so as to be rotatable about a horizontal axis or an inclined axis, a motor for driving the drum to rotate, and A liquid supply means for supplying liquid to the laundry in the drum; and a drum in which the laundry contained in the drum is attached to the inner peripheral surface of the drum side and rotated while the laundry is stored in the outer tub. A drum-type washing machine comprising: an operation control unit that rotates the drum at a rotation speed to perform washing, wherein the operation control unit is configured so that a centrifugal force acting on the laundry stored in the drum exceeds gravity. A drum-type washing machine wherein the rotation speed is controlled so as to periodically perform a third drum rotation speed and a fourth drum rotation speed higher than the third drum rotation speed. 6. The drum has a clothing input port on a front end face, and has a number of liquid passage holes formed on a side peripheral face and a rear end thereof.
4. A liquid holding portion provided on the rear end surface of the drum, the liquid holding portion having an inlet opening toward the shaft side and covering at least a part of the liquid passage hole. Drum type washing machine.