JP7274139B2 - washing machine - Google Patents

Description

The present invention relates to washing machines.

Conventionally, in a washing machine in which a washing/dehydration tub is rotatably arranged in an outer tub elastically supported in a housing, vibration of the outer tub during dehydration is detected, and when the vibration is large, the washing/dehydration tub is detected. In order to reduce the amount of eccentricity of the laundry inside, a washing machine is known in which water is supplied to the outer tub to store water, and the laundry is agitated in the stored water to loosen the laundry. An example of such a washing machine is described in Patent Literature 1, for example.

JP-A-6-190183

In the washing machine described above, when the laundry needs to be loosened, there is a problem that the amount of water used during washing increases by the amount of water stored in the outer tub for loosening. Moreover, since it is necessary to supply and drain the water, there is a problem that the washing time is lengthened.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a washing machine in which the amount of water used is less likely to increase and the washing time is less likely to be extended even when the laundry is loosened.

A washing machine according to a main aspect of the present invention comprises an outer tub elastically supported in a housing, a washing and drying tub rotatably disposed in the outer tub, and a washing and drying tub rotatably disposed in the washing and drying tub. a drive unit for driving the washing/dehydrating tub and the pulsator; a control unit for controlling the driving unit; and a first detection unit for detecting the magnitude of horizontal vibration of the tank. Here, in a state in which water is accumulated in the outer tub before dehydration is started by draining water from the interior of the outer tub, the control unit controls the washing/dehydrating tub by the drive unit by resonance. The outer tub is rotated at a predetermined number of rotations at which the outer tub is easily shaken in the horizontal direction , and the result of detection by the first detection unit in a first period including an acceleration period in which the washing/dehydration tub rises to the predetermined number of rotations is the first period. or when the magnitude of horizontal shaking of the outer tub is greater than a first threshold value, or a second period including a constant speed period in which the washing/dehydrating tub rotates at the predetermined number of revolutions following the first period As a result of the detection by the first detection unit in , if the magnitude of the horizontal vibration of the outer tub during the second period is greater than the second threshold value, the amount of eccentricity of the laundry in the washing/dehydrating tub is large. Then, the pulsator is rotated by the drive unit.

According to the above configuration, the eccentricity of the laundry in the washing/dehydrating tub is estimated while water remains in the outer tub, and if the eccentricity is large, the pulsator rotates in the remaining water. , for example, forward and reverse, and the laundry is loosened. Therefore, it becomes difficult to supply water into the outer tub for loosening, and thus the amount of water used is less likely to increase. In addition, since it is not necessary to supply water or drain water for loosening, the washing time is less likely to be extended due to loosening.

Depending on the eccentricity of the laundry in the washing/dehydrating tub, even if the amount of eccentricity is about the same, the shaking of the outer tub may not be so great during the constant speed period, but the shaking of the outer tub may be large during the acceleration period. Or, conversely, the shaking of the outer tub may not be so great during the acceleration period and the shaking of the outer tub may be large during the constant speed period.

According to the above configuration, the eccentricity is based on the detection result of the first detection unit during the first period including the acceleration period and the detection result of the first detection unit during the second period including the constant speed period at the predetermined rotation speed. Since the amount is determined, it is possible to accurately determine the amount of eccentricity.

In the washing machine according to this aspect, the first detection section may be configured to output a detection signal when the outer tub sways in a direction toward the first detection section by a predetermined amount or more. In this case, the control unit obtains an integrated value of the time during which the detection signal is output, and determines the amount of eccentricity based on the integrated value.

According to the above configuration, even though the amount of eccentricity is not large, the amount of eccentricity is erroneously When is large, it becomes difficult to judge. Therefore, it is possible to accurately determine the amount of eccentricity.

The washing machine according to this aspect may further include a second detection section that detects vibration of the outer tub when the washing/dehydrating tub rotates for dehydration. In this case, the first detection section is configured to be capable of detecting a vibration smaller than the vibration of the outer tub that can be detected by the second detection section.

If the amount of eccentricity of the laundry in the washing/dehydration tub is about the same, the outer tub will be heavier when water is stored in the outer tub before dehydration, so the outer tub will sway. becomes difficult.

According to the above configuration, the first detection section can detect a smaller vibration of the outer tub than the second detection section, so that the vibration of the outer tub when the washing/dehydrating tub rotates while water is stored can be suppressed. detectable.

According to the present invention, it is possible to provide a washing machine in which the amount of water used is less likely to increase even when laundry is loosened, and the washing time is less likely to be extended.

The effects and significance of the present invention will become clearer from the description of the embodiments shown below. However, the following embodiment is merely an example of carrying out the present invention, and the present invention is not limited to the embodiments described below.

FIG. 1 is a side cross-sectional view of a fully automatic washing machine according to an embodiment. FIG. 2 is a cross-sectional plan view of the fully automatic washing machine according to the embodiment. FIG. 3 is a block diagram showing the configuration of the fully automatic washing machine according to the embodiment. FIG. 4 is a flowchart showing pre-dehydration eccentricity detection processing according to the embodiment.

Hereinafter, one embodiment of the washing machine of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of a fully automatic washing machine 1. FIG. FIG. 2 is a plan sectional view of the fully automatic washing machine 1. FIG. In FIG. 2, illustration of the four suspension rods 21 is omitted.

The fully automatic washing machine 1 includes a housing 10 that constitutes the appearance. The housing 10 includes a rectangular tubular body 11 with open upper and lower surfaces, a top plate 12 covering the upper surface of the body 11 , and a footrest 13 supporting the body 11 . A laundry inlet 14 is formed in the top plate 12 . The inlet 14 is covered with an openable and closable upper lid 15 .

In the housing 10, an outer tank 20 having an open top is elastically suspended and supported by four suspension rods 21 having a vibration isolator. Inside the outer tub 20, a washing/dehydrating tub 22 having an open upper surface is arranged. The washing/dehydrating tub 22 rotates around a vertically extending rotating shaft. A large number of dehydration holes 22a are formed in the inner peripheral surface of the washing/dehydration tub 22 along the entire circumference. A balance ring 23 is provided above the washing/dehydrating tub 22 . A pulsator 24 is arranged at the bottom of the washing/dehydrating tub 22 . A plurality of blades 24a are radially provided on the surface of the pulsator 24 .

A driving unit 30 for generating torque for driving the washing/dehydrating tub 22 and the pulsator 24 is arranged at the outer bottom of the outer tub 20 . The drive unit 30 includes a drive motor 31 and a transmission mechanism section 32 . The transmission mechanism part 32 has a clutch mechanism 32a, and in the washing process and the rinsing process, the torque of the drive motor 31 is transmitted only to the pulsator 24 to rotate only the pulsator 24 by the switching operation by the clutch mechanism 32a. In the process, the torque of the driving motor 31 is transmitted to the pulsator 24 and the washing/dehydrating tub 22 to integrally rotate the pulsator 24 and the washing/dehydrating tub 22 . Note that the drive unit 30 corresponds to the drive section of the present invention.

An outer bottom portion of the outer tub 20 is formed with a drain port portion 20a. A drain valve 40 is provided in the drain port portion 20a. The drain valve 40 is connected to the drain hose 41 . When the drain valve 40 is opened, the water stored in the washing/dehydrating tub 22 and the outer tub 20 is drained out of the machine through the drain hose 41 .

A water supply unit 50 for supplying tap water to the washing/dehydrating tub 22 is arranged at the rear of the top plate 12 . The water supply unit 50 has a water supply valve 51 . A water inlet 51a of the water supply valve 51 is connected to a tap. When the water supply valve 51 is opened, tap water from the tap is supplied through the water supply passage 52 into the washing/dehydration tub 22 .

A detection member 60 is attached to the outer bottom surface of the outer tub 20 at approximately the center of the front portion in the left-right direction. The detection member 60 extends downward from the outer bottom surface of the outer tub 20 and has a forwardly projecting shielding portion 61 at its distal end.

A first detection unit 70 is provided in front of the detection member 60 on the front surface of the housing 10 . The first detection unit 70 is a non-contact detection sensor and includes a light emitting element 71 , a light receiving element 72 and a mounting member 73 . The mounting member 73 is mounted on the front surface of the housing 10, and has an upper holding portion 74 and a lower holding portion 75 projecting forward from its upper and lower ends, respectively. Light emitting element 71 and light receiving element 72 are held by upper holding portion 74 and lower holding portion 75 so as to face each other. When light is emitted from the light emitting element 71 , the light is received by the light receiving element 72 .

The shielding portion 61 of the detection member 60 is positioned between the light emitting element 71 and the light receiving element 72 in the vertical direction. An upper holding part 74 and a lower holding part 74 are provided so that the shielding part 61 does not move from the position between the light emitting element 71 and the light receiving element 72 even if the outer tank 20 moves downward due to water being accumulated in the outer tank 20 . A vertical interval between the portions 75 is set.

When the outer tub 20 swings and moves in the direction of the first detection unit 70 by a first movement amount or more, for example, 10 mm or more, the light emitting element 71 and the light receiving element 72 are shielded by the shielding portion 61 . As a result, when the light receiving element 72 stops receiving light, a predetermined detection signal is output from the light receiving element 72 , that is, the first detection unit 70 .

As shown in FIG. 2, a second detection unit 80 is provided at a predetermined corner of the upper end of the housing 10, for example, the left rear corner. A second detection unit 80 includes a detection lever 81 , a microswitch 82 , and a holding portion 83 . The holding portion 83 is fixed to the housing 10 . The detection lever 81 is swingably held by a holding portion 83 by a shaft 81 a provided at its upper end, and extends downward to face the outer surface of the upper portion of the outer tub 20 . Microswitch 82 is held by holding portion 83 so as to be close to detection lever 81 .

When the outer tub 20 swings and moves in the direction of the detection lever 81 by the second movement amount or more, the detection lever 81 is pushed by the outer tub 20 and comes into contact with the actuator portion 82 a of the microswitch 82 . As a result, the microswitch 82 is turned on, and a predetermined detection signal is output from the microswitch 82 , that is, the second detection unit 80 .

Note that the first movement amount is smaller than the second movement amount. In other words, the first detection unit 70 is configured to be able to detect shaking smaller than the shaking of the outer tub 20 that can be detected by the second detection unit 80 . The first detection unit 70 corresponds to the first detection section of the invention, and the second detection unit 80 corresponds to the second detection section of the invention.

FIG. 3 is a block diagram showing the configuration of the fully automatic washing machine 1. As shown in FIG.

The fully automatic washing machine 1 includes an operation unit 91 and a water level sensor 92 in addition to the above configuration. The fully automatic washing machine 1 also includes a control unit 100 . Control unit 100 includes control section 101 , storage section 102 , motor drive section 103 , clutch drive section 104 , water supply drive section 105 and water discharge drive section 106 .

The operation unit 91 includes a power button for turning on and off the power of the fully automatic washing machine 1, a start/pause button for starting and pausing the operation, and a plurality of operation courses related to the washing operation. It includes various operation buttons such as a course selection button for selecting a driving course. The operation unit 91 outputs an input signal to the control unit 101 according to the operation button operated by the user.

The water level sensor 92 detects the water level in the washing/dehydrating tub 22 and outputs a water level signal corresponding to the detected water level to the control section 101 .

Detection signals output from the first detection unit 70 and the second detection unit 80 are input to the control section 101 .

The motor drive section 103 drives the drive motor 31 according to the control signal output from the control section 101 . The clutch drive section 104 drives the clutch mechanism 32 a of the transmission mechanism section 32 according to the control signal output from the control section 101 . The water supply drive unit 105 drives the water supply valve 51 according to the control signal from the control unit 101 . The drainage driving section 106 drives the drainage valve 40 according to the control signal from the control section 101 .

Storage unit 102 includes EEPROM, RAM, and the like. The storage unit 102 stores programs for executing washing operations of various operation courses. The storage unit 102 also stores various operating conditions used for the washing operation.

The control unit 101 includes a CPU and the like, and controls the motor drive unit 103, the clutch drive unit 104, the water supply drive unit 105, the water discharge drive unit 106, etc. according to the programs stored in the storage unit 102. FIG.

In the fully automatic washing machine 1, under the control of the control unit 101, washing operations of various operation courses are performed. In the washing operation, a washing process, an intermediate dehydration process, a rinsing process and a final dehydration process are performed in order.

In the washing process and the rinsing process, the pulsator 24 rotates forward and backward while water is stored in the washing/dehydrating tub 22 . The rotation of the pulsator 24 generates a water flow in the washing/dehydrating tub 22 . In the washing process, the laundry is washed by the generated water flow and the detergent contained in the water. In the rinsing process, the laundry is rinsed by the generated water flow. In the rinsing process, depending on the washing course, water rinsing is performed or rinsing with water is performed. Depending on the washing course, the rinsing process may be performed twice. In this case, the intermediate dehydration process is performed between the first rinsing process and the second rinsing process.

In the intermediate dehydration process and the final dehydration process, the washing/dehydration tub 22 and the pulsator 24 are integrally rotated at a predetermined dehydration rotation speed. The laundry is dehydrated by the action of the centrifugal force generated in the washing/dehydrating tub 22 . Hereinafter, when the intermediate dehydration process and the final dehydration process are not distinguished, they are simply referred to as the dehydration process.

When the amount of eccentricity of the laundry in the washing/dehydration tub 22 is large, the outer tub 20 shakes violently in the horizontal direction in the so-called horizontal resonance region while the washing/dehydration tub 22 is starting up the dehydration rotation speed in the dehydration process. is detected by the second detection unit 80 . Further, in a so-called vertical resonance region in which the number of revolutions is higher than the horizontal resonance region, the outer tub 20 shakes violently in the vertical direction, and this shaking is detected by a large increase in the value of the current flowing through the drive motor 31 . In this case, the washing/dehydrating tub 22 is stopped and a loosening action is added. That is, water is accumulated in the outer tub 20 by re-supplying water, and the pulsator 24 rotates forward and backward. As a result, the laundry in the washing/dehydrating tub 22 is loosened.

However, in the dehydration process, if the loosening operation as described above is added, the amount of water used will increase due to the re-supply of water, and the washing time will be extended due to the addition of the water supply time and the drain time. .

Therefore, in the present embodiment, the amount of eccentricity is determined in a state in which water is stored in the outer tub 20 before the water is drained from the interior of the outer tub 20 and dehydration is started. A pre-dehydration eccentricity detection process is executed to enable the loosening operation using the water stored in the outer tub 20 . As a result, in the dehydration process, it is possible to make it difficult to perform a loosening operation that requires re-supply of water, to make it difficult to increase the amount of water used, and to make it difficult to extend the washing time.

When the washing operation by forward and reverse rotation of the pulsator 24 is completed in the washing process, or when the rinse operation by forward and reverse rotation of the pulsator 24 is completed in the rinse process, pre-dehydration eccentricity detection processing is executed. Water is stored in the outer tank 20 when the pre-dehydration eccentricity detection process is executed. A part of the water in the outer tub 20 may be drained before the pre-dehydration eccentricity detection process.

FIG. 4 is a flowchart showing pre-dehydration eccentricity detection processing.

The control unit 101 activates the drive motor 31 so that the washing/dehydrating tub 22 rotates at the detection rotation speed (S1). The rotation speed for detection can be set to a rotation speed at which the outer tub 20 is easily shaken in the horizontal direction due to resonance, and can be set to 40 rpm, for example.

Next, the control section 101 monitors the detection signal from the first detection unit 70 (S2). When the outer tub 20 moves more than the first movement amount due to shaking and a detection signal is output from the first detection unit 70 (S2: YES), the control section 101 measures the output time (S3). The control unit 101 repeats the processes of S2 and S3 until the first detection time elapses after starting the washing/dehydrating tub 22 (S4: NO).

Thereby, the output time is measured each time the detection signal is output. These output times are temporarily stored in the buffer of the control unit 101 . The first detection time is the time required for the washing/dehydrating tub 22 to rise to the detection rotation speed, and may be 15 seconds when the detection rotation speed is 40 rpm, for example. Therefore, when the first detection time has elapsed, the washing/dehydrating tub 22 has almost reached the rotation speed for detection. The first detection time includes a period during which the washing/drying tub 22 starts up, that is, an acceleration period of the washing/drying tub 22, and corresponds to the first period of the present invention.

When the first detection time elapses (S4: YES), the control unit 101 integrates all the output times measured within the first detection time, and stores the integrated output time in the storage unit 102 as the first integrated value. Store (S5). The greater the shaking of the outer tub 20, the longer the first detection unit 70 detects the shaking, the longer the output time of the detection signal, and the larger the first integrated value. This first integrated value is a value that indicates the magnitude of shaking of the outer tub 20 during the acceleration period of the washing/dehydrating tub 22 .

Next, the control section 101 again monitors the detection signal from the first detection unit 70 (S6). When the detection signal is output from the first detection unit 70 (S6: YES), the control section 101 measures the output time (S7). After the first detection time has elapsed, the control unit 101 repeats the processes of S6 and S7 until the second detection time has elapsed (S8: NO).

Thereby, the output time is measured each time the detection signal is output. These output times are temporarily stored in the buffer of the control unit 101 . The second detection time is the time required to determine the magnitude of the shaking of the outer tub 20 after the washing/dehydration tub 22 rises to the detection rotation speed, and can be set to 10 seconds, for example. The second detection time includes, following the first detection time, a constant speed period during which the washing/dehydrating tub 22 rotates at the detection rotation speed, and corresponds to the second period of the present invention.

When the second detection time elapses (S8: YES), the control unit 101 integrates all the output times measured within the second detection time, and stores the integrated output time in the storage unit 102 as a second integrated value. Store (S9). This second integrated value is a value that indicates the magnitude of shaking of the outer tub 20 during the constant speed period in which the washing/dehydrating tub 22 rotates at the detection rotation speed.

After that, the control unit 101 stops the drive motor 31 to stop the washing/dehydrating tub 22 (S10).

Next, the control unit 101 determines whether or not the first integrated value is greater than the first threshold (S11). Furthermore, the control unit 101 determines whether or not the second integrated value is greater than the second threshold (S12).

When the amount of eccentricity of the laundry in the washing/dehydration tub 22 is large, the outer tub 20 tends to shake greatly during the acceleration period when the rotation of the washing/dehydration tub 22 starts up, especially in the period immediately after starting, and the washing/dehydration tub 22 is used for detection. During the constant speed period in which the outer tub 20 rotates at the rotation speed, resonance is likely to occur at this rotation speed, so the outer tub 20 is likely to shake greatly. However, depending on the eccentricity of the laundry in the washing/dehydrating tub 22, even if the amount of eccentricity is similarly large, the shaking of the outer tub 20 will not be so great during the constant speed period, and the shaking of the outer tub 20 will be less during the acceleration period. Conversely, the shaking of the outer tub 20 may not be so great during the acceleration period and the shaking of the outer tub 20 may be large during the constant speed period. Therefore, in the present embodiment, the amount of eccentricity is determined by comparing the first integrated value with the first threshold value and comparing the second integrated value with the second threshold value.

Each of the first threshold and the second threshold has an eccentricity that is large enough to prevent the washing/dehydration tub 22 from properly starting up to the dehydration rotation speed in the dehydration process if the eccentricity is maintained. It is a value that the first integrated value and the second integrated value at that time exceed, and is set in advance based on experiments or the like. It should be noted that the fact that the rotation speed of the dehydration cannot be properly raised means that, for example, in the dehydration process, the outer tub 20 shakes violently, and the detection by the second detection unit 80 or the current of the drive motor 31 causes such shaking. is detected.

When the first integrated value is equal to or less than the first threshold value and the second integrated value is equal to or less than the second threshold value (S11: NO→S12: NO), the control section 101 terminates the pre-dehydration eccentricity detection process. After the water is drained from the outer tank 20, the dehydration process, that is, the intermediate dehydration process or the final dehydration process is performed.

On the other hand, if the first integrated value is greater than the first threshold (S11: YES) or if the second integrated value is greater than the second threshold (S12: YES), the controller 101 causes the pulsator 24 to rotate forward. and reverse, and the loosening operation is performed for a predetermined time (S13). At this time, since water is stored in the outer tub 20, water is not supplied into the outer tub 20. - 特許庁It should be noted that there may be a case where water is supplementarily supplied into the outer tank 20 .

The loosening operation loosens the laundry in the washing/dehydrating tub 22 and reduces the eccentricity. After completing the loosening operation in S13, the control unit 101 returns the process to S1.

Although not shown in FIG. 4, even if the loosening operation in S13 is performed a predetermined upper limit number of times, the first integrated value becomes larger than the first threshold value, or the second integrated value becomes the second integrated value. When it becomes larger than 2 thresholds, a washing operation may be interrupted and an error notification may be performed by a display unit or a buzzer (not shown). Further, instead of interrupting the washing operation, the water may be drained and the dehydration process may be started.

<Effect of Embodiment>
As described above, according to the present embodiment, by executing the pre-dehydration eccentricity detection process, the laundry in the washing/dehydration tub 22 is in a state where water remains in the outer tub 20 before shifting to the dehydration step. is estimated, and when the eccentricity is large, the pulsator 24 rotates forward and reverse in the remaining water to loosen the laundry. Therefore, it becomes difficult to supply water into the outer tub 20 for loosening, so that the amount of water used is less likely to increase. In addition, there is no time for water supply and drainage for loosening.

Further, according to the present embodiment, as in S11 and S12 in FIG. 4, the detection result by the first detection unit 70 of the first detection time including the acceleration period and the constant speed period at the detection rotation speed are included. Since the amount of eccentricity is determined based on the detection result of the first detection unit 70 during the second detection time, that is, the first integrated value and the second integrated value, it is possible to accurately determine the amount of eccentricity.

Furthermore, according to the present embodiment, the integrated value of the time during which the detection signal is output from the first detection unit 70 is obtained, and the amount of eccentricity is determined based on the integrated value. Therefore, even though the amount of eccentricity is not large, the amount of eccentricity is erroneously large when, for some reason, the outer tank 20 temporarily shakes greatly and the shaking is detected by the first detection unit 70. It becomes difficult to be judged. Therefore, it is possible to accurately determine the amount of eccentricity.

Furthermore, when the amount of eccentricity of the laundry in the washing/dehydrating tub 22 is about the same, the outer tub 20 is heavier when water is stored in the outer tub 20 before dehydration than during dehydration. , the outer tub 20 is less likely to shake. According to the present embodiment, since the first detection unit 70 can detect a smaller shaking of the outer tub 20 than the second detection unit 80, when the outer tub 22 rotates while water is stored, 20 swings can be detected well.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the embodiments of the present invention can be modified in various ways other than those described above. .

For example, in the above embodiment, in S4 of the pre-dehydration eccentricity detection process shown in FIG. 4, it is determined whether or not the first detection time has elapsed. However, in S4, it may be determined whether or not the number of rotations of the drive motor 31 has reached the number of rotations corresponding to the number of rotations for detection of the washing/dehydrating tub 22 or not. In this case, the period from when the drive motor 31 is started until it reaches the rotation speed corresponding to the detection rotation speed is the acceleration period, which corresponds to the first period of the present invention.

In the above embodiment, the first detection unit 70, which is a non-contact detection sensor, detects the shaking of the outer tub 20 in which water is stored. However, the shaking of the water-filled outer tub 20 may be detected by a contact-type detection sensor such as the second detection unit 80 .

Furthermore, in the above-described embodiment, in the pre-dehydration eccentricity detection process shown in FIG. 4, the eccentricity amount is determined based on both the first integrated value and the second integrated value. However, the eccentricity amount may be determined based on any one of the first integrated value and the second integrated value. In addition, the integrated value of the output time of the detection signal from the start of the drive motor 31 until the sum of the first detection time and the second detection time elapses, that is, the first integrated value and the second integrated value. The amount of eccentricity may be determined based on the sum of the values.

Furthermore, in the above embodiment, an example in which the present invention is applied to the fully automatic washing machine 1 is shown. However, the present invention can also be applied to a fully automatic washing and drying machine equipped with a clothes drying function.

In addition, the embodiments of the present invention can be appropriately modified in various ways within the scope of the technical idea indicated in the scope of claims.

1 fully automatic washing machine (washing machine)
10 housing
20 outer tank
22 Washing and dehydrating tank
24 pulsator
30 drive unit (drive part)
70 first detection unit (first detection unit)
80 second detection unit (second detection unit)
101 control unit

Claims (3)

an outer tank elastically supported in the housing;
a washing/dehydrating tub rotatably arranged in the outer tub;
a pulsator rotatably arranged in the washing/dehydrating tub;
a driving unit for driving the washing/dehydrating tub and the pulsator;
a control unit that controls the driving unit;
a first detection unit for detecting the magnitude of horizontal vibration of the outer tub when the washing/dehydrating tub rotates in the outer tub filled with water;
The control unit
In a state in which water is stored in the outer tub before dehydration is started after the water is drained from the outer tub, the driving unit causes the washing/dehydrating tub to vibrate in the horizontal direction due to resonance. Rotate at a predetermined number of revolutions to make it easier ,
As a result of detection by the first detection unit in a first period including an acceleration period in which the washing/drying tub rises up to the predetermined number of rotations, the magnitude of horizontal vibration of the outer tub in the first period is greater than a first threshold. is larger, or as a result of detection by the first detection unit in a second period including a constant speed period in which the washing/dehydrating tub rotates at the predetermined number of revolutions following the first period, the If the magnitude of the horizontal vibration of the outer tub is greater than a second threshold value , it is determined that the amount of eccentricity of the laundry in the washing/dehydrating tub is large , and the drive unit rotates the pulsator.
A washing machine characterized by: In the washing machine according to claim 1 ,
The first detection unit outputs a detection signal when the outer tub sways in a direction toward the first detection unit by a predetermined amount or more,
The control unit
Obtaining an integrated value of the time when the detection signal is output,
determining the amount of eccentricity based on the integrated value;
A washing machine characterized by: In the washing machine according to claim 1 or 2 ,
further comprising a second detection unit that detects shaking of the outer tub when the washing/dehydration tub rotates for dehydration,
The first detection unit is configured to be able to detect shaking smaller than the shaking of the outer tank that can be detected by the second detection unit.
A washing machine characterized by:

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