JP2023130646A - washing machine - Google Patents

Abstract

To provide a washing machine capable of supplying an optimum amount of water according to an amount of laundry, thereby performing washing by beating with a high washing performance.SOLUTION: A washing machine D according to the present invention comprises: a drum 8 which stores laundry and has a lifter 8b; an outer tub 10 in which the drum 8 is included; a water supply valve 16a for supplying water to the outer tub 10; a drive device 9 for rotationally driving the drum 8; detection means 14 for detecting the acceleration of the outer tub 10; and a control device 7 for controlling the drive device 9 and the water supply valve 16a on the basis of the acceleration. Before a washing step, the control device 7 rotates the drum 8 with the laundry put therein, and repeats a step of, while intermittently supplying water by the water supply valve 16a, detecting the acceleration of the outer tub 10 when the laundry is lifted by the lifter 8b and dropped in the drum 8, by using the detection means 14. When a variation M2-M1 of mechanical forces M2 and M1 in the outer tub 10 which are obtained from the acceleration becomes less than a threshold, the supply of water by the water supply valve 16a is stopped, and the washing machine proceeds to the washing step.SELECTED DRAWING: Figure 5

Description

The present invention relates to a washing machine.

A drum-type washer/dryer washes, rinses, and dehydrates clothes by loading them into a drum whose center axis is substantially horizontal or whose front is tilted upward. During washing and rinsing, the drum is rotated at low speed around its central axis, and a tumbling action is performed in which the clothes accumulated at the bottom of the drum are lifted up and dropped from above. This tumbling action applies mechanical force (hereinafter referred to as mechanical force) to the clothes for washing. In order to improve the cleaning power, it is necessary to increase the mechanical force that lifts the clothes accumulated at the bottom of the drum and causes them to fall from above the drum to the inner peripheral surface of the drum.

In the washing process of a drum-type washing machine, a so-called pound washing method is known, in which clothes are lifted up by the rotation of the drum and then dropped, and mechanical force is applied to increase the washing power.
Cited document 1 describes a method of increasing the mechanical force during washing by lowering the water level during washing to a position lower than the lowest inner circumferential surface of the drum so that water-containing clothing falls onto the inner circumferential surface of the drum. It is shown.

Japanese Patent Application Publication No. 9-215893

By the way, in Patent Document 1, even if the water level in the outer tank is set below the lowest surface in the drum, if the amount of clothing is small, water may be supplied in an amount greater than the amount that the clothing can contain. In such a case, the detergent concentration becomes diluted and the cleaning performance deteriorates. Also, washing water is wasted.
The present invention was devised in view of the above-mentioned circumstances, and an object of the present invention is to provide a washing machine that can perform tumble washing with high cleaning performance.

In order to solve the above problems, a washing machine of the present invention includes a drum that accommodates laundry and has a lifter, an outer tank that encloses the drum, a water supply valve that supplies water to the outer tank, and a rotary drive for the drum. a detection means for detecting acceleration of the outer tank; and a control device for controlling the drive device and the water supply valve based on the acceleration; The drum containing the laundry is rotated and water is supplied by the water supply valve, and the detection means detects the acceleration of the outer tub when the laundry is lifted by the lifter and falls into the drum. The detection is repeated, and when the amount of change in the mechanical force of the outer tank determined by the acceleration becomes less than a threshold value, the water supply by the water supply valve is stopped and the process proceeds to the washing step.

According to the present invention, it is possible to provide a washing machine that can perform pound washing with high cleaning performance.

1 is an external view of a drum-type washer-dryer according to an embodiment of the present invention. FIG. 2 is a side cross-sectional view with a part of the casing cut away to show the internal structure of the drum-type washer/dryer. FIG. 2 is a schematic front cross-sectional view of the state of clothes in the drum during tumble washing in a drum-type washer/dryer. FIG. 2 is a schematic front cross-sectional view of the state of clothes in the drum during tumble washing in a drum-type washer/dryer. The figure which shows the structure of the control device which is a control part which controls each process of a washer-dryer. 1 is a flowchart showing the operation flow of a washing operation of a drum type washer/dryer. The figure which shows the flow of a mechanical force measurement process. The figure which shows the flow of a moisture content measurement process. FIG. 3 is a schematic front sectional view showing the inside of the drum and outer tank.

Embodiments of the present invention will be described in detail below with reference to the drawings as appropriate.

FIG. 1 shows an external view of a drum-type washer/dryer D according to an embodiment of the present invention.
FIG. 2 shows a side cross-sectional view of the housing 1 partially cut away to show the internal structure of the drum-type washer/dryer D.
The drum type washer/dryer D of the embodiment is a device that washes laundry or washes and dries laundry.

<Overall configuration of drum type washing/drying D>
The drum type washer/dryer D has an outer shell formed by a housing 1.
The housing 1 is mounted on a base 1h placed on an installation surface S.
The housing 1 includes left and right side plates 1a, 1b, a front cover 1c, a back cover 1d (see FIG. 2), a top cover 1e (see FIG. 1), and a lower front cover 1f.

The left and right side plates 1a and 1b are connected by a U-shaped upper reinforcing member, a front reinforcing member, and a rear reinforcing member (not shown). The side plates 1a and 1b have sufficient strength as the housing 1.

The door 2 is provided so as to be able to open and close an input port 1c1 provided approximately in the center of the front cover 1c for loading and unloading clothing. Therefore, the door 2 is supported so as to be openable and closable by a hinge (not shown) provided on the front reinforcing member.

By pressing the door release button 2a shown in FIG. 1, a locking mechanism (not shown) is released and the door 2 is opened. On the other hand, by pressing the door 2 against the front cover 1c, the door 2 is locked and closed. The front reinforcing member has a circular opening for taking clothes in and out, concentric with an opening 10b (see FIG. 2) of the outer tank 10, which will be described later.

An operation/display panel 3 provided at the center of the upper part of the housing 1 includes a power switch 4, an operation button 5, and a display 6. The operation/display panel 3 is electrically connected to a control device 7 (see FIG. 2) provided at the bottom of the housing 1.

An outer tank cover 10a is provided at the front opening 10k of the cylindrical outer tank 10 shown in FIG. 2, allowing water to be stored in the outer tank 10. The outer tub cover 10a has an opening 10b in the front center thereof for putting in and taking out clothes i.
A rubber bellows 11 is connected to the opening 10b, and when the door 2 is closed, the outer tank 10 is sealed against water. A drain port 10d is provided at the bottom of the outer tank 10. A drain hose 12 is connected to the drain port 10d. A drain valve (not shown) is provided in the middle of the drain hose 12. Water is stored in the outer tank 10 by closing the drain valve and supplying water, and the water in the outer tank 10 is discharged to the outside of the machine by opening the drain valve.

The outer tank 10 is supported in a vibration-proof manner by a suspension 13 (consisting of a coil spring and a damper) whose lower side is fixed to a base 1h. Further, the upper side of the outer tank 10 is supported by an auxiliary spring (not shown) attached to an upper reinforcing member, which prevents the outer tank 10 from falling in the front-rear direction.
The outer tank 10 coaxially encloses the drum 8, has an open front surface, and has a motor 9 attached to the center of the outer side of the rear end surface. The rotating shaft of the motor 9 passes through the outer tank 10 and is coupled to the drum 8.

The drum 8 has a cylindrical shape and is rotatably supported by the outer tank 10. The rotation center axis O of the drum 8 is horizontal or inclined so that the opening 8a side is higher.
The outer peripheral wall 8g and bottom wall 8s of the drum 8 have a large number of through holes 8k for water and ventilation. The front end surface of the drum 8 is provided with an opening 8a for taking clothes in and out.
A fluid balancer 8c is provided integrally with the drum 8 outside the opening 8a of the drum 8. A plurality of lifters 8b extending in the axial direction are provided inside the outer peripheral wall 8g of the drum 8.

FIGS. 3A and 3B are front cross-sectional schematic diagrams showing the state of the clothes i in the drum 8 during tumble washing in the drum-type washer-dryer D.
As shown in FIG. 3A, when the drum 8 rotates during washing and drying (arrow α1 in FIG. 3A), the garment i is lifted along the outer peripheral wall 8g by the lifter 8b and centrifugal force, and as shown in FIG. 3B, the garment i is lifted by gravity. i repeats a motion in which it falls onto the inner circumferential surface 8n of the drum 8 (as indicated by the white arrow in FIG. 3B). This is called tataki washing.

An acceleration sensor 14 (see FIG. 2) that measures the acceleration of the outer tank 10 is installed at the bottom of the outer tank 10. The acceleration sensor 14 is a three-axis acceleration sensor 14 (14a, 14b, 14c) that can detect acceleration in three directions: vertical, longitudinal, and horizontal.

As shown in FIG. 2, a control device 7 is provided at the front lower part of the drum type washer/dryer D.
The control device 7 controls the rotational speed of the drum 8 based on the output information of the acceleration sensor 14.

The detergent container 15y shown in FIG. 1 is provided in the upper left side of the housing 1. A pull-out detergent tray 15 is attached to the detergent container 15y from the front opening. When putting detergent into the detergent container 15y, the detergent tray 15 is pulled out forward as shown by the two-dot chain line in FIG. The detergent container 15y is fixed to the upper reinforcing member of the housing 1.

At the rear of the detergent container 15y, parts related to water supply, such as a water supply valve (not shown), a bath water supply pump, and a water level sensor, are provided. The detergent container 15y is connected to and communicates with the outer tank 10. The water supply valve is a multiple valve, and supplies water to the detergent container 15y and the drying duct 18 (see FIG. 2) equipped with a water cooling and dehumidifying mechanism.

The cover 1e shown in FIG. 1 is provided with a water supply hose connection port 16 from a water faucet and a water suction hose connection port 17 for remaining hot water in the bath.

The drying duct 18 shown in FIG. 2 is installed vertically inside the back surface of the housing 1. The lower part of the drying duct 18 is connected to an intake port 10c provided at the lower back surface of the outer tank 10 by a first bellows tube 18a made of rubber. A water cooling and dehumidifying mechanism is built into the drying duct 18. Cooling water is supplied to the water cooling dehumidification mechanism from a water supply valve. The cooling water flows down along the inner wall surface of the drying duct 18, enters the outer tank 10 from the intake port 10c, and is discharged from the drain port 10d.

The upper part of the drying duct 18 is connected to a filter duct 19 installed in the upper right side of the housing 1 in the front-rear direction. The filter duct 19 has an opening in the front surface, and a pull-out dry filter 20 is inserted into the opening. Air entering filter duct 19 from drying duct 18 flows into a mesh filter (not shown) of drying filter 20 to remove lint. The dry filter 20 is cleaned by pulling out the dry filter 20 and taking out the mesh filter.

The blower unit 22 includes a driving motor 22a, a fan impeller (not shown), and a fan case 22b. A heater 23 is built into the fan case 22b and heats the air sent from the fan impeller. A discharge port 22o of the blower unit 22 is connected to a hot air duct 24. The hot air duct 24 is connected to a hot air outlet 25 provided in the outer tank cover 10a via a second bellows tube 24a made of rubber. In this embodiment, since the air blowing unit 22 is provided on the upper right side of the housing 1 (see FIG. 1), the hot air outlet 25 is provided at the diagonally upper right position of the outer tank cover 10a. I am trying to keep the distance to 25 as short as possible.

<Control device 7>
FIG. 4 shows the configuration of the control device 7, which is a control section that controls each process of the washer/dryer D.
The control device 7 is mainly configured with a microcomputer (hereinafter referred to as microcomputer) 41 in which a control program is stored.
The control device 7 controls the water supply valve 16a, drain valve 12a, motor 9, etc. based on the input from the operation/display panel 3 (see FIG. 1), the acceleration sensor 14, and the rotational speed detection device 42 according to a prerecorded control program. and performs washing, rinsing, and drying processes. The motor 9 is driven via a motor drive circuit 43 based on control information from the microcomputer 41 .

A driving pattern database 45 is stored in the microcomputer 41. Further, the microcomputer 41 includes a rotation speed calculation section 46, a cloth amount calculation section 47, a vibration amount calculation section 48, a rotation speed search section 49, an operation time recording section 50, a heater control section 51, and a memory 52.

The rotation speed calculation unit 46 calculates the rotation speed based on the signal from the rotation speed detection device 42. The heater control section 51 controls the heater 23 based on the rotation speed information from the rotation speed calculation section 46, information from the operating time recording section 50, and the like.

<Washing operation of drum type washer/dryer D>
The operation of the drum 8 and the like when a washing operation is performed in the drum type washer/dryer D will be explained.
FIG. 5 shows the operational flow of the washing operation of the drum type washer/dryer D.
Under the control of the control device 7, a series of washing operations and drying operations in the drum-type washing/drying machine D are performed.

When washing and drying is started (S1 in FIG. 5), the amount of cloth is measured (S2 in FIG. 5).
This measurement of the amount of cloth is performed when the rotary drum 8 is rotated in one direction in the dry cloth state before washing water is supplied, and the motor 9 is rotated while increasing the speed from a specified rotational speed to another specified rotational speed. This is done based on the drive current integrated value.

Next, open the water supply valve 16a (see FIG. 4) and supply water (S3). Water is supplied for several minutes while checking the amount of water in the outer tank 10 using a water level sensor. At this time, the detergent placed in the detergent container 15y is also flushed away.
After that, a mechanical force measurement step is performed (S4). The mechanical force measurement step (S4) is performed using a machine that serves as a reference during the washing process (see FIGS. 4A and 4B) in which the clothing i in the drum 8, which is used as a reference in the moisture content measurement step (S5), is lifted up and dropped by the lifter 8b. This is a flow for setting force M1.

Subsequently, a moisture content measurement step (details will be described later) (S5) is performed to estimate the moisture content of clothing i while intermittent water supply is performed, and water supply is stopped when the moisture content is saturated. The moisture content measuring step (S5) is a process for determining the optimum moisture content for the amount of clothing placed in the drum 8. The moisture content measuring step (S5) ends when the amount of change in the maximum acceleration from the previous measurement becomes small.
Specifically, the degree of water content in the clothing i is estimated by rotating the drum 8 during water supply and measuring the impact force using the acceleration sensor 14. The greater the degree of water content in the clothing i, the greater the weight of the clothing i, and therefore the greater the vibration (acceleration, impact force) when the clothing i falls due to the rotation of the drum 8.

As a result of the moisture content measuring step, the rotational speed at which the mechanical force M2 is the highest is calculated, and the washing operation is performed at that rotational speed (S6 in FIG. 5). During the washing operation, the rotation time in one direction is increased to increase the washing power. This washing operation also repeats forward rotation, stop, reverse rotation, and stop. During the washing process, the detergent liquid is evenly sprinkled onto the clothes i inside the drum 8 using a detergent circulation pump (not shown) provided at the bottom of the main body.
The washing operation time is the standard setting time of the drum-type washer/dryer D, and can be set individually by the user.

When a standard predetermined time or a user-set time has elapsed (S7), the water is drained (S8) and the washing process is completed.
After that, rinsing water is supplied and a rinsing operation (S9) is performed. In the rinsing step, detergent liquid is removed from clothing i. At this time, normal rotation, stop, reverse, stop, normal rotation, etc. are repeated at the rotation speed at which the mechanical force M2 is the highest.
After that, the water is drained (S10).

Thereafter, the drum 8 is rotated at high speed to perform a dehydration operation in which water contained in the clothes is removed by centrifugal force (S11), and the washing operation is completed.
After the washing operation ends, the drying operation continues.

<Mechanical force measurement process (S4)>
Next, the mechanical force measuring step (S4) shown in FIG. 5 will be explained.
The mechanical force measuring step (S4) is a flow for setting the mechanical force M1 for pounding and washing by which the reference garment i in the drum 8 is lifted and dropped by the lifter 8b in the water content degree measuring step (S5).
In advance, the drum rotation speed (number of rotations) is set so that the rotation speed (number of rotations) at which the garment i is put into the drum 8 and lifted by the lifter 8b is included between drum rotation speed (number of rotations) (1) to (3). Set 1), (2), and (3). For example, the drum rotation speed (2) is 40 rpm, the drum rotation speed (1) is 37 to 38 rpm, and the drum rotation speed (3) is 42 to 43 rpm.

Note that the drum rotation speeds (1), (2), and (3) may be set depending on the amount of clothing (large amount, medium amount, small amount) of clothing i.
For example, when the amount of clothing i is large, the rotational speed at which clothing i is put into the drum 8 and lifted by the lifter 8b is included between the rotational speeds (1) to (3) of the drum 8. The rotation speed (1), rotation speed (2), and rotation speed (3) of the drum 8 are set in advance.
When the amount of clothing i is medium or small, the rotational speed (number of rotations) at which clothing i is put into drum 8 and lifted by lifter 8b is the rotational speed (1) to (3) of drum 8. The rotational speed (1), rotational speed (2), and rotational speed (3) of the drum 8 are set so as to be included between the two.

FIG. 6 shows the flow of the mechanical force measurement step (S4).
With the clothing i placed in the drum 8, the drum 8 is operated at rotational speed (1), and the mechanical force A1 at that time is determined from the acceleration a1 measured by the acceleration sensor 14 (S41 in FIG. 6). Mechanical force A1 is obtained by multiplying mass of clothing i by acceleration a1.
Next, with the clothing i placed in the drum 8, the drum 8 is operated at rotational speed (2), and the mechanical force A2 at that time is determined from the acceleration a2 measured by the acceleration sensor 14 (S42 in FIG. 6). . Mechanical force A2 is obtained by multiplying mass of clothing i by acceleration a2.

Next, with the clothing i placed inside the drum 8, the drum 8 is operated at rotational speed (3), and the mechanical force A3 at that time is determined from the acceleration a3 measured by the acceleration sensor 14 (S43 in FIG. 6). . Mechanical force A3 is obtained by multiplying mass of clothing i by acceleration a3.
Subsequently, it is determined whether mechanical force A1>mechanical force A2 (S44 in FIG. 6).
If mechanical force A1>mechanical force A2 (Yes in S44 in FIG. 6), it is determined whether mechanical force A1>mechanical force A3 (S45 in FIG. 6).

If mechanical force A1>mechanical force A3 (Yes in S45 in FIG. 6), mechanical force A1 is set as mechanical force M1 (S46 in FIG. 6).
If mechanical force A1>mechanical force A3 is not found in S45 of FIG. 6 (No in S45 of FIG. 6), mechanical force A3 is set as mechanical force M1 (S49 of FIG. 6).
On the other hand, if mechanical force A1>mechanical force A2 is not satisfied in S44 (No in S44 in FIG. 6), it is determined whether mechanical force A2>mechanical force A3 (S47 in FIG. 6).

If mechanical force A2>mechanical force A3 (Yes in S47 in FIG. 6), mechanical force A2 is set as mechanical force M1 (S48 in FIG. 6).
In S47 of FIG. 6, if mechanical force A2>mechanical force A3 is not satisfied (No in S47 of FIG. 6), mechanical force A3 is set as mechanical force M1 (S49 of FIG. 6).
Through the above mechanical force measurement process, the largest mechanical force among the mechanical forces A1 to A3 is set as the mechanical force M1.

<Water content measurement step (S5)>
Next, the water content measuring step (S5) shown in FIG. 5 will be explained.
The degree of water content in the clothing i is estimated by rotating the drum 8 containing the clothing i during water supply and measuring the impact force using the acceleration sensor 14 (see FIG. 2). The greater the degree of water content in the clothing i, the greater the weight of the water-containing clothing i, and therefore the greater the vibration (acceleration, impact force) when the clothing i lifted by the lifter 8b due to the rotation of the drum 8 falls.

FIG. 7 shows the flow of the water content measurement process.
First, a mechanical force M1 is set in a mechanical force measuring step (S4) (S61 in FIG. 7).
Subsequently, a certain amount of shower water is supplied to the clothes i placed in the drum 8 (S62 in FIG. 7).
Thereafter, the drum 8 is rotated at a rotational speed that generates the mechanical force M1, and the clothes i in the drum 8 are lifted and dropped by the lifter 8b, and the impact force (mechanical A force M1) is generated. The impact force of the outer tank 10 is measured by an acceleration sensor 14 (see FIG. 2).

From the acceleration measured by the acceleration sensor 14, the mechanical force M2 (=acceleration×mass of clothing i) when the clothing falls within the drum 8 is determined (S63 in FIG. 7).
Subsequently, it is determined whether M2-M1<(predetermined) threshold (S64 in FIG. 7). When the maximum acceleration does not change from the previous measurement (the difference between M2-M1 is below the threshold), it is determined that the moisture content of clothing i is saturated. By determining that the difference between M2-M1 is less than or equal to the threshold value, it is possible to determine whether the moisture content of clothing i is saturated.

As the clothes i in the drum 8 contain water, there is a limit to the amount of water that the clothes i can contain, so the mechanical force when the clothes fall in the drum 8 gradually becomes saturated. Therefore, a threshold value is determined in advance. Therefore, by determining that the change in mechanical force M2-M1 is less than the threshold value, it can be determined whether the water contained in the clothes in the drum 8 is almost saturated.
If M2−M1<threshold (Yes in S64), the moisture content measurement step ends.
If M2-M1<threshold (No in S64), whether the water level in the outer tank 10 is greater than the water level threshold;
That is, it is determined that water level>water level threshold (S65 in FIG. 7).

FIG. 8 shows a schematic front sectional view showing the inside of the drum 8 and the outer tank 10.
The amount of washing water w stored in the outer tub 10 is less than the inner peripheral surface 8n of the drum 8 during the washing process. The water surface w0 of the washing water w stored in the outer tub 10 is prevented from reaching the inner circumferential surface 8a (water level w1) of the drum 8.
This is because when there is no washing water w in the drum 8, the clothes i containing the washing water directly hit the inner circumferential surface 8n of the drum 8, improving the washing performance of washing by beating.

By determining that water level>water level threshold (water level w1) and not putting washing water into the drum 8, effective washing can be performed.
If the water level (water surface w0)>the water level threshold (water level w1) (Yes in S65 of FIG. 7), the water content degree measuring step ends. When the water level w1 reaches a certain level or higher (about to reach the inner circumferential surface 8n of the drum 8), water supply is also terminated and the process proceeds to main washing (S6 in FIG. 5).
If the water level does not exceed the water level threshold (No in S65), the mechanical force M2 obtained in S63 is replaced with M1 (S66 in FIG. 7). Then, the process moves to S62 in FIG. 7, where a certain amount of shower water is supplied (S62 in FIG. 7), the drum 8 is rotated, and the measurement (S63, S64, S65, and S66 in FIG. 7) is repeated.

According to the above configuration, the amount of water used in drum-type washing and drying D can be minimized, so that the detergent concentration can be maximized and the cleaning power can be increased. In addition, water saving performance can also be improved.

<<Other embodiments>>
1. In the above embodiment, the case where water level>water level threshold was explained in S65 of FIG. 7, but it may be determined that water level (water surface w0)>=water level threshold (water level w1).

2. In the above embodiment, the case where M2-M1<threshold was explained in S64 of FIG. 7, but current acceleration (acceleration of mechanical force M2) - previous acceleration (acceleration of mechanical force M1)<predetermined A comparison may be made with a threshold acceleration. In this case as well, it can be confirmed that the moisture content of clothing i is saturated.
The threshold acceleration is predetermined by reducing the amount of change in acceleration.

3. In addition, in the embodiment described above, in S63 of FIG. 7, the drum 8 is rotated at the rotational speed at which the mechanical force M1 is generated to obtain the mechanical force M2. ).

4. The present invention is not limited to the configurations of the embodiments and modifications described above, and various modifications and specific forms are possible within the scope of the appended claims.

7 Control device 8 Drum 8b Lifter 8n Inner peripheral surface of drum 9 Motor (drive device)
10 Outer tank i Clothes (laundry)
14, 14a, 14b, 14c acceleration sensor (detection means)
16a Water supply valve D Drum type washer/dryer (drum type washing machine)
M1, M2 Mechanical force w Water w1 Water level

Claims (5)

a drum containing laundry and having a lifter;
an outer tank containing the drum;
a water supply valve that supplies water to the outer tank;
a drive device that rotationally drives the drum;
a detection means for detecting acceleration of the outer tank;
a control device that controls the drive device and the water supply valve based on the acceleration;
The control device rotates the drum containing laundry before the washing process,
Repeatedly supplying water with the water supply valve and detecting with the detection means the acceleration of the outer tub when the laundry is lifted by the lifter and falls into the drum;
A washing machine characterized in that when the amount of change in the mechanical force of the outer tub determined by the acceleration becomes less than a threshold value, water supply by the water supply valve is stopped and the washing process is started. The washing machine according to claim 1,
The washing machine characterized in that the amount of change in the mechanical force of the outer tub is determined by the difference between the mechanical force before the current water supply and the mechanical force after the previous water supply. a drum containing laundry and having a lifter;
an outer tank containing the drum;
a water supply valve that supplies water to the outer tank;
a drive device that rotationally drives the drum;
a detection means for detecting acceleration of the outer tank;
a control device that controls the drive device and the water supply valve based on the acceleration;
The control device rotates the drum containing laundry before the washing process,
Repeatedly supplying water with the water supply valve and detecting with the detection means the acceleration of the outer tub when the laundry is lifted by the lifter and falls into the drum;
A washing machine characterized in that when the amount of change in the acceleration becomes less than a threshold value, water supply by the water supply valve is stopped and the washing process is started. The washing machine according to claim 3,
The washing machine characterized in that the amount of change in the acceleration of the outer tub is determined by the difference between the acceleration before the current water supply and the acceleration after the previous water supply. In the washing machine according to claim 1 or claim 3,
The control device includes:
When the water level of the water stored in the outer tank reaches the inner peripheral surface of the drum due to water supply by the water supply valve, or before reaching the inner peripheral surface of the drum, the water supply by the water supply valve is stopped. A washing machine, characterized in that the washing machine moves to the washing step.

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