JP3259364B2 - Fully automatic washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully automatic washing machine with reduced vibration and noise during dehydration.

[0002]

2. Description of the Related Art Generally, in a fully automatic washing machine, washing and draining are performed, and then a dehydration step is performed. Is usually increased to a certain extent, that is, after performing so-called intermittent dehydration, and then performing continuous dehydration.

[0003] In a conventional fully automatic washing machine, on / off control of the motor is performed by time. That is, as shown in FIG. 9, after the motor is turned on for a certain time t1, the motor is turned off for a certain time t2, then the motor is turned on for the same time, and the motor is turned off for the same time. By repeating this several times, the rotation speed of dehydration was gradually increased.

[0004]

In such a fully automatic washing machine, when there is a lot of laundry and when there is little laundry, laundry that is likely to contain water and laundry that does not easily contain water, or good or poor drainage conditions such as a drainage path, etc. The on / off time of the motor is set irrespective of laundry conditions and drainage conditions. For example, when dewatering laundry containing a large amount of moisture, such as a blanket, towels and towels with a rated capacity are used. For example, when dewatering tubs, the laundry contains more moisture than usual, and if the draining time is short, the foam and water contained in the laundry will remain at the bottom of the water tank. As indicated by the broken line 9, the washing and dewatering tub was prevented from rotating, and abnormal vibrations and abnormal sounds were sometimes generated.

Further, as shown in FIG. 10, a rotational speed detecting means is provided, and after the motor is turned on at the time of intermittent spin-drying, the rotational speed detecting means detects that the preset rotational speed V1 has been reached. The motor is turned off for a predetermined time t3, the motor is turned on again, and the rotation speed detecting means detects that the rotation speed V2 has been set higher than the rotation speed V1. Turn on the motor. Next, after the rotation speed detecting means detects that the rotation speed V3 has reached the set rotation speed V3 higher than the rotation speed V2, a predetermined time t
Turn off the motor by 3 and turn it on again. This is repeated n times to gradually increase the rotation speed, and then the motor is continuously turned on to start up to a specified rotation speed Vi to perform dehydration. Depending on the conditions of the laundry, such as the laundry that is likely to contain water and the laundry that is difficult to contain, and the drainage conditions such as the drainage path, and the drainage conditions, the amount of residual water increases and the dewatering bubble activation deteriorates, and the broken line in FIG. As shown by (2), there is a problem that the number of revolutions does not increase, the temperature of the motor rises abnormally, and a loud residual water noise is generated.

An object of the present invention is to solve the above-mentioned problems, and a first object of the present invention is to accurately detect bubbles generated due to variations in laundry conditions and drainage conditions and residual water in drainage.

[0007] In addition, even if there are variations in laundry conditions, drainage conditions, etc., the dehydration operation can be performed stably to prevent abnormal temperature rise of the motor due to poor start of dehydration, large residual water noise, and abnormal vibration. A second object is to prevent the dehydration time from becoming extremely long.

[0008]

In order to achieve the first object, the present invention comprises a water tub containing a washing and dewatering tub in which a pulsator is rotatably arranged at the center bottom, and a vibration isolator. A hanging rod supporting the water tub and the like, a signal control means including a microcomputer, a motor for driving the washing and dewatering tub to perform a dehydration operation, a rotation speed detection means for detecting a motor rotation speed, and a cloth amount detection Cloth amount detecting means,
In the dehydration process, foam is generated by the rotation speed increase amount calculated by the rotation speed and time of the washing and dewatering tub, which is detected by the rotation speed detection unit, and a value corresponding to the cloth amount detected by the cloth amount detection unit. A first means for solving the problem is to provide a control means for detecting residual water of waste water.

In order to achieve the second object, a water tank containing a washing and dewatering tank in which a pulsator is rotatably arranged at the center bottom portion, and a hanging rod having a vibration isolator and supporting the water tank and the like. A signal control means comprising a microcomputer; a motor for driving the washing and dewatering tub to perform a dehydration operation; a rotation number detection means for detecting a motor rotation number; a cloth amount detection means for detecting a cloth amount; When the residual water is detected by the residual water detecting means, the rotational speed of the washing and dewatering tub is reduced to a rotational speed Va higher than a vibration resonance point of the water tub or the like. A second problem solving means is to increase the number of revolutions of the washing and dewatering tub.

[0010] Also, a water tub containing a washing and dewatering tub in which a pulsator is rotatably arranged at the center bottom, a hanging rod having a vibration isolator and supporting the water tub and the like, and a signal control means comprising a microcomputer are provided. A motor that drives the washing and spin-drying tub to perform spin-drying operation, a rotation speed detection unit that detects a motor rotation speed, a cloth amount detection unit that detects a cloth amount, and a foam and drainage remaining water detection unit, When the residual water is detected by the residual water detecting means, the rotational speed of the washing and dewatering tub is reduced to a rotational speed Va higher than a vibration resonance point of the water tub and the like, and then the rotational speed of the washing and dewatering tub is increased. When the remaining water is detected again by the remaining water detecting means, the motor is turned off for a predetermined time tp after the rotation speed Va ′ higher than the vibration resonance point of the water tank or the like is reached, and the motor is turned on again. repeated na times , That it has to increase the rotational speed is set to the third means for solving problems.

[0011]

According to the first aspect of the present invention, there is provided:
In order to detect the foam and the remaining water of the drainage by the value according to the rotation speed increase amount and the cloth amount detected by the cloth amount detecting means, the foam and the remaining water of the drainage are detected appropriately according to the amount of the laundry. Erroneous detection can be prevented, and the detection accuracy can be improved.

Further, according to the second means for solving the problem, even if the condition of the laundry and the drainage condition vary, when the foam and the residual water of the drainage are detected, the rotation speed of the washing and dewatering tub is increased by the vibration of the water tub or the like. By lowering the rotation speed to higher than the resonance point, bubbles and drainage remaining at the bottom of the water tank can be quickly discharged, and since the water tank does not vibrate greatly due to resonance, the dehydration operation is performed stably, and dehydration start failure As a result, abnormal temperature rise of the motor, loud residual water noise and abnormal vibration can be prevented, and the dehydration time can be prevented from becoming extremely long.

Further, according to the third means for solving the problem, even when the condition of the laundry and the drainage condition are extremely bad, the rotation speed of the washing and dewatering tub is reduced to a rotation speed higher than the vibration resonance point of the water tub or the like. At the same time, if residual water is detected again, the motor is repeatedly turned on and off at a higher rotational speed than the vibration resonance point of the water tank, etc., so that bubbles and drainage can be quickly discharged, and the water tank does not vibrate greatly due to resonance, so dehydration is started. It is possible to prevent an abnormal rise in temperature of the motor, loud residual water noise, and abnormal vibration due to a failure, and it is possible to prevent an excessively long dehydration time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

As shown in the figure, the washing and dewatering tub 1 has a pulsator 2 rotatably disposed at the center bottom. Aquarium 3
Includes a washing and spin-drying tub 1, a substrate 4 is fixed to the outer bottom of the water tub 3, and a drive motor 5, a drain valve 6, a washing and spin-drying switching mechanism 7 and the like are provided. The outer edge is suspended from an upper corner of the outer frame 10 via a vibration isolator 8 and a suspension rod 9. An upper cover 11 is provided above the outer frame 10, and a water supply valve 12, a power switch 13, a control device 14, and the like are provided. The control device 14 includes a signal control means 15 composed of a microcomputer, an operation display means 17 composed of a key switch and a display device provided in an operation panel 16, a motor 5, a drain valve 6 according to a signal from the signal control means 15. A power switching unit 18 for controlling the water supply valve 12, a rotation speed detection unit 19 for detecting a motor rotation speed, a cloth amount detection unit 20, a water level detection unit 21,
The signal control means 15 includes a storage means 22, a dirt detection means 23, and the like.
, The motor 5 is turned off for a certain time ti, and the motor 5 is turned on again. This is repeated m times. Then, the motor 5 is turned on to rotate the motor at a speed higher than the vibration resonance point. After reaching the rotation speed V2, the motor 5
Is turned off and the motor 5 is turned on again, and after repeating this n times, the rotation speed is gradually increased, and the motor 5 is continuously turned on to perform dehydration. Foam in the water tub 3 is determined by a value corresponding to the increase in the number of rotations calculated by the number of rotations and time of the washing and dewatering tub 1 detected by the detection means 19 and the amount of cloth detected by the cloth amount detection means 20. The system detects residual water from wastewater. Reference numeral 24 denotes an AC power supply, and reference numeral 25 denotes a phase advance capacitor of the motor 5.

The operation of the above configuration will be described with reference to FIGS. 3A and 3B. In the dehydration step, the motor 5 is repeatedly turned on and off to gradually remove water from the laundry.
After performing so-called intermittent dehydration, in which the dehydration rotation speed is gradually increased to a certain degree, continuous dehydration is performed by increasing the rotation speed to a specified value. That is, as shown by the solid line in FIGS. 3A and 3B, after the motor 5 is turned on and the rotation speed detection means 19 detects that the rotation speed V1 has reached a lower level than the vibration resonance point of the water tank 3 or the like, The motor 5 is turned off for a predetermined time ti. Even when this is off, the water squeezed from the laundry is drained. Then, the motor 5 is turned on again, and after the rotation speed detecting means 19 detects that the rotation speed V1 has been reached, the motor 5 is turned off for a predetermined time ti, and the motor 5 is turned on again. This is m
After repetition of the number of rotations, the rotation speed detecting means 19 detects that the rotation speed V2 is set higher than the rotation speed V1 and higher than the vibration resonance point of the water tank 3 or the like, and then the motor 5 is turned off for a predetermined time tj. Then, the motor 5 is turned on again. After this is repeated n times, the rotation speed is gradually increased, and the motor 5 is continuously turned on to start up to a specified rotation speed Vi to perform dehydration. Here, the amount of laundry is small,
In addition, when the amount of residual water is large and the number of rotations in intermittent dehydration is as shown by a broken line in FIG.
Is Kak '<Ka, where Kak' = Kak '= Vak' / tak ', and the remaining water can be detected.

When the amount of laundry is large and the amount of residual water is large and the number of rotations in intermittent dehydration is indicated by a broken line in FIG. 3 (b), the number of rotations increase Kbk 'is The predetermined rotational speed increase K when the amount of washing detected by the amount detecting means is large.
Compared with b, Kbk '<Kb, where Kbk' = Vbk '/ tbk', and residual water can be detected. Here, as shown by the solid line in FIG. 3 (b), the rotation speed increase amount Kbk (Kbk = Vbk / tbk) when the dehydration starts normally even when the amount of laundry is large is shown in FIG.
Compared with the rotation speed increase amount Kak 'when the amount of laundry is small and the amount of remaining water is large as indicated by the broken line in (a), Kbk
<Kak ′> in some cases, the predetermined rotation speed increase amount Ka is set to a predetermined rotation speed increase amount according to the cloth load amount even when residual water detection is performed. Without this, accurate residual water detection can be performed.

Next, the operation will be described in detail with reference to FIG. FIG. 4 is a flowchart of the above operation, showing a case where the amount of laundry is small.

When dehydration starts, after the timer T is started in step 101, the drain valve 6 is operated in step 102 to start draining. When drainage is completed in step 103, the process proceeds to step 104, where the motor 5 is turned on to start intermittent dehydration. Then, at step 105, the rotation speed detection means 19 detects the rotation speed Van at a predetermined time tan, and at step 106, the rotation speed increase amount Kan is calculated.
If Kan is not greater than Ka in step 7, remaining water is detected in step 112.

When Kan> Ka, when the rotation speed detecting means 19 detects that the rotation speed V1 is lower than the vibration resonance point in step 108, the process proceeds to step 109 and the motor 5 is turned off. If it is determined in step 110 that the predetermined time ti has elapsed, the process proceeds to step 111, and step 1
The operation from step 04 to step 110 is repeated M times. Then, the motor 5 is turned on again. At step 114, the rotation speed detection means 19 detects the rotation speed Van at the predetermined time tan. At step 115, the rotation speed increase amount Kan is calculated. At 112, residual water is detected. In step 117, when the rotation speed detecting means 19 detects that the rotation speed V2 is higher than the vibration resonance point, the process proceeds to step 118, where the motor 5 is turned off. If it is determined in step 119 that the predetermined time tj has elapsed,
The operation from step 113 to step 119 is repeated N times. Then, the process proceeds to step 121, where the motor 5 is turned on again.
When the rotation speed detecting means 19 detects that the rotation speed V3 has been reached in step 125, the remaining water is detected in step 125.
Proceed to 6 to turn off the motor 5. If it is determined in step 127 that the predetermined time tk has elapsed, the set rotation speed V is set to V4,
After the operations from step 121 to step 127 are repeated in the same manner as described above while increasing to V5.
Then, main dehydration is started, and dehydration is continuously performed until the dehydration is completed. Here, the predetermined time tan may be a certain time. Also,
When the amount of laundry is large, the same applies to the above, except that the predetermined rotation speed increase amount becomes Kb.

In the above embodiment, the cloth amount detection is divided into two stages. However, the cloth amount detection may be divided into a plurality of stages, and the cloth amount may be detected either during washing or during dehydration. is there. Furthermore, residual water can be detected in the main dehydration in the same manner as described above.

Next, a second embodiment of the present invention will be described. The signal control means 15 shown in FIG. 2 is for controlling the washing and dewatering tub 1 detected by the rotation speed detecting means 19 in the dewatering process.
When the amount of increase in the number of rotations calculated based on the number of rotations and the time and the amount of cloth detected by the cloth amount detection means 20 are detected as bubbles in the water tank 3 or residual water of drainage, washing and removal are performed. After reducing the rotation speed of the water tub 1 to a rotation speed Va higher than the vibration resonance point of the water tub 3 or the like, the rotation speed of the washing and dewatering tub 1 is increased. Other configurations are the same as those of the first embodiment.

The operation of the above configuration will be described with reference to FIG. 5 (a).
In the case where the rotation speed in the intermittent dehydration is as shown by the broken line in FIGS. 3A and 3B, the rotation speed calculated by the rotation speed of the washing and dewatering tub 1 detected by the rotation speed detecting means 19 and the time is used. The remaining water is detected by a value corresponding to the increase amount and the cloth amount detected by the cloth amount detecting means 20, and the rotation speed of the washing and dewatering tub 1 is reduced to a rotation speed Va higher than the vibration resonance point of the water tub 3 or the like. After that, since the rotation speed of the washing and dewatering tub 1 is increased, the foam and residual water remaining at the bottom of the water tub 3 can be quickly discharged, and the rotation speed of the washing and dewatering tub 1 is controlled by vibration resonance. Point, the dehydration operation is stably performed without abnormal vibration due to resonance, and the motor 5
In addition to preventing abnormal temperature rise, large residual water noise and abnormal vibration, it is possible to prevent the dehydration time from becoming extremely long.

FIG. 6A is a flowchart of the above operation.
At step 129, a value corresponding to the rotation speed increase calculated by the rotation speed and time of the washing and dewatering tub 1 detected by the rotation speed detecting means 19 and the cloth amount detected by the cloth amount detecting means 20. When the residual water is detected by the
Then, the motor 5 is turned off, and in step 131, the rotation speed is reduced to a rotation speed Va higher than the vibration resonance point.
At 32, the motor 5 is turned on to increase the number of revolutions and perform dehydration.

As shown in FIGS. 5 (b) and 6 (b), when residual water is detected in step 129, the flow goes to step 133.
The motor 5 is turned off, and if it is determined in step 134 that the predetermined time tl has elapsed, the motor 5 is turned on in step 135, and from step 133 until the rotation speed Va higher than the vibration resonance point is reached in steps 136 and 137. The operation up to step 137 may be repeated, and the rotation speed may be reduced gradually or stepwise. Further, as shown in FIG. 5C, the rotation speed may be held at the rotation speed Va higher than the vibration resonance point for a predetermined time, and when the rotation speed is increased, the steps from 138 to 141 are performed. The above operation may be repeated to increase the rotation speed gradually or stepwise while turning the motor 5 on and off.

Next, a third embodiment of the present invention will be described. The signal control means 15 in FIG. 2 lowers the rotation speed of the washing and dewatering tub 1 to a rotation speed Va higher than the vibration resonance point of the water tub 3 or the like when detecting bubbles or remaining water of the drainage in the water tub 3 during the dewatering process. After that, the rotation speed of the washing and dewatering tub 1 is increased. At this time, when remaining water is detected again, the motor is turned off for a predetermined time tp after reaching the rotation speed Va 'higher than the vibration resonance point of the water tub 3 or the like. After turning on the motor again and repeating this na times, the number of revolutions is increased. Other configurations are the same as those of the above embodiments.

The operation of the above configuration will be described with reference to FIG. 7. In the case of intermittent dehydration, when the amount of residual water is large and the number of rotations in intermittent dehydration is as shown by the broken lines in FIGS. 3 (a) and 3 (b), Remaining water is detected by a value corresponding to the rotation speed increase calculated by the rotation speed and time of the washing and dewatering tub 1 detected by the rotation speed detecting means 19 and the cloth amount detected by the cloth amount detecting means 20. And the number of revolutions of the washing and dewatering tub 1
If the remaining water is detected again when the rotation speed of the washing and dewatering tub 1 is increased after the rotation speed is lowered to a higher rotation frequency than the vibration resonance point of the water tank 3, the motor is driven at a rotation speed higher than the vibration resonance point of the water tub 3 or the like. 5 can be repeatedly turned on and off to quickly discharge bubbles and drainage. Therefore, even if the conditions of laundry and drainage are extremely poor, abnormal temperature rise of the motor 5 due to poor start-up of dehydration and loud residual water noise, It is possible to prevent abnormal vibration and to prevent the dehydration time from becoming extremely long.

Next, the operation will be described in detail with reference to FIG. If residual water is detected in step 144, the process proceeds to step 145, where the motor 5 is turned off to reduce the rotation speed to a rotation speed Va higher than the vibration resonance point. Then, the process proceeds to step 146, where the motor 5 is turned on, and the rotation is performed in step 147. The number of rotations Van at a predetermined time tan is detected by the number detecting means 19, and the number of rotations increase Kan is calculated in step 148.
If Kan is not greater than Ka at 49, then again at step 151,
Detect remaining water. Then, the process proceeds to step 152, where the motor 5 is turned off. If it is determined in step 153 that the predetermined time tp has elapsed, the motor 5 is turned on in step 154.
When the rotation speed Va 'is higher than the vibration resonance point in Step 155, Step 156 is repeated from Step 152 to Step 1
After the operation up to 55 is repeated na times, the motor 5 is turned on to increase the number of revolutions and perform dehydration.

When increasing the rotation speed from step 157, the rotation speed may be increased gradually or stepwise while the motor 5 is turned on and off.

[0030]

As is apparent from the above embodiments, according to the present invention, a water tank including a washing and dewatering tank in which a pulsator is rotatably arranged at the center bottom portion, and a water tank having a vibration isolator, etc. , A signal control means comprising a microcomputer, a motor for driving the washing and dewatering tub to perform a dehydrating operation, a rotation speed detecting means for detecting a rotation speed of the motor, and the washing and dewatering tub A cloth amount detecting means for detecting the amount of cloth in the washing machine, wherein the signal control means increases the number of rotations calculated by the number of rotations and time of the washing and dewatering tub detected by the number of rotations detecting means in the dehydration process. Since the amount of foam and the remaining water of the wastewater in the water tub are detected by a value corresponding to the amount and the amount of the cloth detected by the cloth amount detection unit, the amount of the foam and the drainage are appropriately determined according to the amount of the laundry. To detect residual water It can be, thereby improving the detection accuracy with the erroneous detection can be prevented.

The signal control means includes: a rotation speed increase amount calculated by the rotation speed and time of the washing and dewatering tub detected by the rotation speed detection means in the dehydration process; and a cloth amount detected by the cloth amount detection means. When bubbles or drainage remaining water in the water tub are detected by a value corresponding to the above, the rotation speed of the washing and dewatering tub is reduced to a rotation speed Va higher than the vibration resonance point of the water tub and the like, and then the washing and dewatering is performed. Since the rotation speed of the dewatering tub is increased, even if there are variations in laundry conditions and drainage conditions, if bubbles and remaining water in the drainage are detected, the rotation speed of the washing and dewatering tub is increased by the vibration of the water tub, etc. By lowering the rotation speed to a value higher than the resonance point, bubbles and drainage remaining at the bottom of the water tank can be quickly discharged, and since the water tank and the like do not shake significantly due to resonance, the dehydration operation is performed stably, and the dehydration start failure To As a result, it is possible to prevent the abnormal temperature rise of the motor, loud residual water noise and abnormal vibration, and to prevent the dehydration time from becoming extremely long.

Further, the signal control means detects the increase in the number of revolutions calculated by the number of revolutions and the time of the washing and dewatering tub detected by the number of revolutions detected by the number of revolutions detecting means in the dehydrating process, and the amount of cloth detected by the cloth amount detecting means. When the remaining amount of foam or drainage in the water tub is detected by a value corresponding to the amount of cloth that has been washed, after reducing the rotation speed of the washing and dewatering tub to a rotation speed Va higher than the vibration resonance point of the water tub or the like. The rotation speed of the washing and dewatering tub is increased, and at this time, when remaining water is detected again,
After reaching the rotation speed Va ′ higher than the vibration resonance point of the water tank or the like, the motor is turned off for a predetermined time tp and the motor is turned on again, and after repeating this na times, the rotation speed is increased. Even when the laundry conditions and drainage conditions are extremely poor, the rotation speed of the washing and dewatering tub is reduced to a rotation speed higher than the vibration resonance point of the water tub, etc. The motor is repeatedly turned on and off at a rotation speed higher than the vibration resonance point, so that bubbles and drainage can be quickly discharged.Moreover, since the water tank and the like do not shake significantly due to resonance, abnormal temperature rise of the motor due to dehydration start failure and large residual water Sound and abnormal vibration can be prevented, and the dehydration time can be prevented from becoming extremely long.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fully automatic washing machine according to a first embodiment of the present invention.

FIG. 2 is a block diagram of the fully automatic washing machine.

FIG. 3 (a) is a diagram showing the relationship between the time and the spinning speed in the spinning cycle when the cloth load of the automatic washing machine is small. (B) The spinning of the automatic washing machine when the cloth load is high. Diagram showing the relationship between time and spin speed in the process

FIG. 4 is an operation flowchart of the fully automatic washing machine.

FIGS. 5 (a) to 5 (c) are diagrams showing the relationship between time and spinning speed in the spinning cycle of the fully automatic washing machine according to the second embodiment of the present invention.

6 (a) and 6 (b) are operation flowcharts of the same automatic washing machine.

FIG. 7 is a diagram illustrating a relationship between time and spin speed in a spin cycle of a fully automatic washing machine according to a third embodiment of the present invention.

FIG. 8 is an operation flowchart of the fully automatic washing machine.

FIG. 9 is a diagram illustrating an example of a relationship between time and spin-drying speed of a conventional fully automatic washing machine.

FIG. 10 is a diagram showing another example of the relationship between the time and the spinning speed of the conventional fully automatic washing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing and dewatering tank 2 Pulsator 3 Water tank 5 Motor 8 Vibration isolator 9 Hanging rod 15 Signal control means 19 Number of rotations detection means 20 Cloth amount detection means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-129096 (JP, A) JP-A-62-164493 (JP, A) JP-A-4-20387 (JP, A) JP-A-55-1984 99297 (JP, A) Japanese Utility Model 62-636985 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06F 33/02 D06F 39/06

Claims (3)

(57) [Claims] 1. A water tank containing a washing and dewatering tank in which a pulsator is rotatably arranged at a central bottom portion, a hanging rod having a vibration isolator and supporting the water tank and the like, and a signal control means comprising a microcomputer. A motor that drives the washing and dewatering tub to perform a dewatering operation, a rotation speed detecting means for detecting a rotation speed of the motor, and a cloth amount detecting means for detecting a cloth amount in the washing and dewatering tub, The signal control means, the rotation speed increase amount calculated by the rotation speed and time of the washing and dewatering tub detected by the rotation speed detection means in the dehydration process, and the cloth amount detected by the cloth amount detection means A fully automatic washing machine configured to detect bubbles in the aquarium or residual water of drainage according to a value according to the following. 2. A water tank including a washing and dewatering tank in which a pulsator is rotatably disposed at a central bottom portion, a hanging rod having a vibration isolator and supporting the water tank and the like, and signal control means including a microcomputer. A motor that drives the washing and dewatering tub to perform a dewatering operation, a rotation speed detecting means for detecting a rotation speed of the motor, and a cloth amount detecting means for detecting a cloth amount in the washing and dewatering tub, The signal control means, the rotation speed increase amount calculated by the rotation speed and time of the washing and dewatering tub detected by the rotation speed detection means in the dehydration process, and the cloth amount detected by the cloth amount detection means When the residual water of the foam or drainage in the water tub is detected by the value according to the above, after reducing the rotation speed of the washing and dewatering tub to a rotation speed Va higher than the vibration resonance point of the water tub and the like, Dehydration tank speed Fully automatic washing machine so as to rise. 3. A water tub containing a washing and dewatering tub in which a pulsator is rotatably arranged at the center bottom, a hanging rod having a vibration isolator and supporting the water tub and the like, and a signal control means comprising a microcomputer. A motor that drives the washing and dewatering tub to perform a dewatering operation, a rotation speed detecting means for detecting a rotation speed of the motor, and a cloth amount detecting means for detecting a cloth amount in the washing and dewatering tub, The signal control means, the rotation speed increase amount calculated by the rotation speed and time of the washing and dewatering tub detected by the rotation speed detection means in the dehydration process, and the cloth amount detected by the cloth amount detection means When the residual water of the foam or drainage in the water tub is detected by the value according to the above, after reducing the rotation speed of the washing and dewatering tub to a rotation speed Va higher than the vibration resonance point of the water tub and the like, Dehydration tank speed Raising, this time, when detecting again residual water higher than the vibration resonance point such as the tub rotation speed Va '
, The motor is turned off for a predetermined time tp, the motor is turned on again, this is repeated na times, and then the number of revolutions is increased.