JP2002102582A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize the washing time by dissolving a detergent concurrently with a water feed start and to secure washing force, reduce washing irregularities, and reduce the damage to and entangling of the laundry by selecting an effective washing method according to the pollution of the laundry, and the kind, of clothes. SOLUTION: A pulsator 8 is rotatably provided at the inner bottom section of a spinning tub 2 rotatably provided in an outer tub 1, the spinning tub 2 and the pulsator 8 are driven by a motor 5, and a control means controls the operations of a feed water valve 10 and the motor 5 to control courses. The control means has a first course for rotating the spinning tub 2 while feeding water, a second course for sprinkling the washing water in spinning tub 2 from a gap between the outer tub 1 and the spinning tub 2 by the rotation of the spinning tub 2, and a third course for rotating the pulsator 8. The control means can select any combination, which includes only the second course, or only the third course, or the second course and the third course at a prescribed ratio after the first course.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine for washing laundry contained in a washing and dewatering tub by rotating a stirring blade or a washing and dewatering tub provided at the inner bottom of the washing and dewatering tub.

[0002]

2. Description of the Related Art The construction of a pulsator type washing machine, which is one of the conventional typical washing systems, will be described with reference to FIG.

[0003] As shown in FIG. 11, the outer tub 30 includes a washing and dewatering tub 32 in which a stirring blade 31 is rotatably arranged at the bottom, and is suspended from a washing machine outer frame 34 by a hanging bar 33. . The motor 35 is connected to the stirring blade 31 or the washing / dewatering tub 32 via a V-belt 36 and a speed reduction mechanism / clutch 37.
Drive. The drain valve 38 drains the washing water in the washing and dewatering tub 32, and the water supply valve 39 supplies water to the washing and dewatering tub 32.

The washing and dewatering tub 32 is provided with a fluid balancer 40 for reducing vibration during dehydration, and a lid 41 is provided above the washing and dewatering tub 32. Control device 42
Controls the motor 35, the drain valve 38, the water supply valve 39, and the like to sequentially control a series of steps of washing, rinsing, and dehydrating.

The operation of the above construction will be described. After the laundry and a predetermined amount of detergent have been put into the washing / dewatering tub 32, when the washing is started, the water supply valve 39 is controlled by the control device 42, and Is supplied with a predetermined amount of water, and then the controller 35 controls the motor 35 to rotate the stirring blade 31. The laundry and the water in the washing / dewatering tub 32 are stirred by the rotation of the stirring blades 31, and the detergent gradually dissolves into washing water by this stirring, which acts on the soil of the laundry.

[0006]

However, in the case of the washing machine of this configuration, in order to dissolve the supplied detergent,
It is common to rotate the stirring blade 31 at a high speed to stir the laundry and water. In this case, in order to prevent excessive mechanical force from being applied to the laundry, a predetermined amount of After water was supplied, stirring by the stirring blade 31 was performed.

That is, since the stirring blade 31 is not stirred until a predetermined amount of water is supplied, this water supply time has no meaning from the viewpoint of removing stains from the laundry. In addition, the supplied water will permeate the laundry as it is, and in this case, the detergent that has begun to dissolve due to the start of stirring penetrates the entire laundry and reaches a predetermined level until the concentration is uniform to a level necessary for removing stains. Time is required, and in this case too, it is wasted time from the viewpoint of dirt removal.

In addition, starting stirring by the stirring blades 31 from a state where the detergent does not sufficiently act on the laundry is inefficient from the viewpoint of damage to the laundry. That is,
If the laundry is agitated in a state where the detergent is not soaked in the laundry, a large frictional force is applied to the surface of the laundry, and as a result, there is a problem that the surface of the laundry is damaged such as fluff.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and dissolves a detergent at the same time as the start of water supply to make effective use of washing time. In addition, it is possible to select an effective washing method according to stains on laundry and types of clothes. The purpose of the present invention is to secure detergency, reduce uneven washing, and reduce damage and entanglement of laundry.

[0010]

According to the present invention, in order to achieve the above object, a washing and dewatering tub is rotatably provided in an outer tub,
A stirring blade is rotatably provided on the inner bottom of the washing and dewatering tub,
The washing and dewatering tub and the stirring blades are driven by the driving means, the control means controls the water supply means for supplying water into the washing and dewatering tub, the operation of the driving means and the like to control the stroke,
The control means includes: a first step of rotating the washing and dewatering tub while supplying water; and 2
And a third step of rotating the stirring blade.
As a step following the step, only the second step of rotating the washing and dewatering tub, only the third step of rotating the stirring blade,
Alternatively, any one of a combination of the second stroke and the third stroke at a predetermined ratio can be selected.

[0011] Thus, the detergent can be dissolved at the same time as the start of water supply to cause the washing water to act on the stains on the laundry, so that the washing time can be effectively utilized. By selecting the rotation ratio of the spin-drying tub or the stirring blade, it is possible to select an effective washing method for dirt on the laundry. Entanglement can be reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a washing and dewatering tub rotatably provided in an outer tub, and a stirring blade rotatably provided at the inner bottom of the washing and dewatering tub. Water supply means for supplying water to the washing and dewatering tub, driving means for driving the washing and dewatering tub and stirring blades, the water supply means,
Control means for controlling operations such as driving means and controlling a stroke, the control means comprising: a first step of rotating a washing and dewatering tub while supplying water; and an outer tub by rotating the washing and dewatering tub. A second step of sprinkling the washing water into the washing and dewatering tub from between the washing and dewatering tub, and a third step of rotating the stirring blade, as a step following the first step, Only the second step of rotating the washing and dewatering tub, only the third step of rotating the stirring blade, or a combination of the second step and the third step at a predetermined ratio can be selected. In the first step, the detergent can be dissolved at the same time as the water supply is started, and the washing water can act on the stains on the laundry, so that the washing time can be effectively utilized,
In the second step, the washing water can be evenly sprinkled on the laundry to act on the dirt, thereby reducing the unevenness of the washing of the laundry. In the third step, the washing water is applied to the dirt of the laundry. The stirring blade can be rotated after it has been activated or after it has been more thoroughly sprayed. For this reason, only the second step of rotating the washing and dewatering tub is performed as a step following the first step, depending on the type of clothes and the stain on the laundry.
By selecting either the third step of rotating the agitating blade or the combination of the second step and the third step at a predetermined ratio, the method is effective according to the type of laundry and clothes. A suitable washing method can be selected, washing power can be ensured, washing unevenness can be reduced, and the frictional force applied to the laundry can be reduced to reduce damage and entanglement of the laundry.

[0013] According to a second aspect of the present invention, in the first aspect of the present invention, at least one of the first and second strokes is performed by changing the water level in the washing and dewatering tub. The number of rotations is variable, and in the first stroke, the resistance that hinders the rotation of the washing and dewatering tub due to the rise in the water level in the washing and dewatering tub is increased, thereby driving the washing and dewatering tub. The power consumption of the driving means increases significantly,
The temperature can be prevented from rising significantly, and in the second stroke,
At each water level, the washing water can be sprinkled in an optimal amount for the laundry, thereby reducing uneven washing.

According to a third aspect of the present invention, in the first aspect of the present invention, in the third step, the rotation speed of the stirring blade can be changed according to the water level in the washing and dewatering tub. In addition, the agitating water flow is used as an anti-entanglement water flow, and the mechanical force applied to the laundry is minimized, so that the frictional force on the surface of the laundry is reduced, the damage to the laundry is reduced, and the cleaning effect can be improved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) As shown in FIG.
Has a washing and dewatering tub 2 rotatably disposed therein, and is suspended from a washing machine outer frame 4 by a hanging rod 3. A motor (driving means) 5 rotationally drives a washing / dewatering tub 2 and a stirring blade 8 rotatably disposed on the inner bottom of the washing / dewatering tub 2 via a V-belt 6 and a speed reduction mechanism 7. The cover body 9 forms a discharge part for watering provided on the upper part of the outer tub 1,
The water supply valve (water supply means) 10 is for supplying water to the washing and dewatering tub 2, the water level detection means 11 is for detecting the water level in the outer tub 1, and the drain valve 12 is provided for the outer tub 1. Drain the washing water inside.

The control device 13 is constructed as shown in FIG. 2, and the control means 14 is constituted by a microcomputer, and operates the motor 5, water supply valve 10, drain valve 12 and the like via a power switching means 15. And sequentially controls a series of steps such as washing, rinsing, and dehydration. The input setting means 16 is for setting a driving course and the like.
4 inputs information from the input setting means 16 and displays it on the display means 17 based on the information to inform the user. The storage unit 18 stores data necessary for control by the control unit 14. Reference numeral 19 denotes a commercial power supply, and reference numeral 20 denotes a power switch.

Here, in the washing process, the control means 14 controls the outer tub 1 and the washing and dewatering tub 2 by rotating the washing and dewatering tub 2 while supplying water to the first step. And a third step of sprinkling the washing water into the washing and dewatering tub 2 from between the second step and a third step of rotating the stirring blade 8.

Referring to FIG. 3, the operation will be described with reference to FIG. 3. After the laundry and the detergent are put into the washing and spin-drying tub 2, the water supply valve 10 is operated to supply water into the washing and spin-drying tub 2. The first step of rotating the double spin tub 2 is performed. As shown in FIG. 3A, until the water level in the washing and dewatering tub 2 reaches T1 at which the set water level S1 is reached, the washing and dewatering tub 2
Rotates at a rotation speed R1 as shown in FIG.

When water is supplied while rotating the washing and dewatering tub 2 as described above, the supplied detergent starts to dissolve due to the stirring force generated by the rotation of the washing and dewatering tub 2.
As shown in (c), the washing water concentration in the washing and dewatering tub 2 increases at the same time as the rotation starts. And temporarily 10
After a high concentration state of more than 0%, finally, almost 10%
A concentration of 0% is reached.

The operation of the first step is to supply water to the set water level while rotating the washing / dewatering tub 2. Until the time T1 of the first step, the washing water having a high concentration gradually penetrates into the laundry and acts on the soil, and the washing water passes through the laundry by centrifugal force generated by the rotation of the washing and dewatering tub 2. And acts on the stains on the laundry. Further, in the first step, no frictional force is directly applied to the laundry, so that the laundry is not damaged.

Next, the operation of the second step will be described. The time T1 when the water level in the washing and dewatering tub 2 reaches S1 is described.
To stop the water supply valve 10 and increase the rotation speed of the washing and dewatering tub 2 to the rotation speed R2. By increasing the rotation speed of the washing and dewatering tub 2 to the rotation speed R2, the power of stirring the washing water in the washing and dewatering tub 2 is increased, and the water level in the washing and dewatering tub 2 becomes as shown in FIG. The central part is lowered, the space between the washing and dewatering tub 2 and the outer tub 1 is raised, and finally, the water is sprayed into the washing and dewatering tub 2 beyond the height of the upper end of the washing and dewatering tub 2. You.
The rotation speed R2 is set in advance to a rotation speed at which the washing water is sprinkled into the washing and dewatering tub 2.

The operation of the second stroke is such that the washing water is sprinkled from the upper portion of the washing and dewatering tub 2 during the period from the time T1 to the time T2, and circulates through the laundry.
By this process, the washing water can be evenly supplied to the laundry, and the sprinkled washing water repeatedly circulates through the laundry due to the centrifugal force generated by the rotation of the washing and dewatering tub 2. As a result, dirt attached to the laundry is removed. Also, in the second step, the laundry is not directly agitated when the washing water is sprinkled and passed, so that the laundry is not damaged.

Next, the operation of the third step will be described. The washing and dewatering tub 2 is rotated to allow the washing water to pass through the laundry so as to act on the dirt, or the water is sprayed and circulated for a predetermined time. After that, the rotation of the washing and dewatering tub 2 is stopped. Thereafter, as shown in FIG. 5, the stirring blade 8 is operated,
Stir the laundry. As shown in FIG. 3, the operation of agitating the laundry with the agitating blades 8 to remove dirt from the time T2 to the time T3 is the operation of the third operation.

At this time, since the washing water is evenly soaked in the laundry before the third step, dirt is efficiently removed by applying a stirring force to the laundry. In addition, mechanical power is added to the laundry by agitation, but the lubricating effect of the wash water that has permeated the laundry evenly and the frictional force applied to the surface of the laundry is reduced by making the agitated water flow an anti-entanglement water flow. Can be prevented from being caused by the frictional force.

In FIG. 3, as a step following the first step, a second step of rotating the washing and dewatering tub and a third step of rotating the stirring blade are performed. Depending on the degree of dirt on the collar and sleeves and the type of clothing, the control means 14 determines that the second stroke only, the third stroke only, or the second and third strokes as a stroke following the first stroke. Can be selected from any combination at a predetermined ratio.

[0027] Thus, an effective washing method can be selected in accordance with the stains of the laundry and the type of clothing, so that the washing power can be secured and unevenness in washing can be reduced, and the frictional force applied to the laundry is reduced. By doing so, damage and entanglement of the laundry can be reduced.

(Embodiment 2) As shown in FIG. 6, a control means 24 includes a rotation control means 25 for controlling the number of rotations of the motor 5.
As shown in FIG. 7, the rotation control unit 25 includes a rotation number detection unit 26 that detects a rotation number from an output of the rotation detection unit 21 that detects the rotation of the motor 5, and an output of the water level detection unit 11. Rotation speed setting means 2 for setting the rotation speed more
7, the output of the rotational speed detecting means 26 and the rotational speed setting means 27
And a conduction angle setting means 29 for setting the conduction angle of the power switching means 15 based on the output of the rotation number comparison means 28.

The water level in the washing and dewatering tub 2 is determined by a water level detecting means 1.
1 is detected by the rotation speed setting means 27.
Sent to In the rotation speed setting means 27, an appropriate rotation speed of the motor 5 according to the water level is set, and in the first stroke and the second stroke, the number of rotations of the washing and dewatering tub 2 is changed in accordance with the water level in the washing and dewatering tub 2. The rotation speed of the dehydration tub 2 is variable. Other configurations are the same as those in the first embodiment.

The operation in the first step of rotating the washing and dewatering tub 2 while supplying water will be described with reference to FIG.

When the operation is started after the laundry and the detergent are put into the washing and dewatering tub 2, the water supply valve 10 is operated by the control means 24 to supply water into the washing and dewatering tub 2. At the same time, the motor 5 operates and the washing and dewatering tub 2 starts rotating.
As time passes, the water level in the washing and dewatering tub 2 becomes S2
To rise. The water level in the washing and dewatering tub 2 is detected by the water level detecting means 11, and the information is transmitted to the rotation speed setting means 27.

The rotation speed setting means 27 is set in advance with an appropriate rotation speed corresponding to the water level, and receives the water level information from the water level detection means 11 and adjusts the rotation speed from the rotation speed setting means 27 to the rotation speed comparison means 28. The information on the number of revolutions is sent, the number of revolutions is compared with the output of the number of revolutions detecting means 26 by the number of revolutions comparing means 28, and the conduction angle of the power switching means 15 is set by the conduction angle setting means 29 to control the number of revolutions of the motor 5. I do.

FIG. 8 shows one example in which the number of revolutions of the washing and dewatering tub 2 is changed according to the change in the water level in the washing and dewatering tub 2 in the first step. Washing and dewatering tub 2
When water is supplied while rotating at a constant speed, the water level between the outer tub 1 and the washing and dewatering tub 2 rises as the water level in the washing and dewatering tub 2 gradually rises, and this water is 2 is a resistance that hinders rotation. If the washing and spin-drying tub 2 is kept rotating at a constant speed, the power consumption of the motor 5 will increase significantly, and if the temperature of the motor 5 rises significantly and exceeds the allowable range, the motor will break down. May occur.

In order to solve these problems, it is necessary to control the load applied to the motor 5 to a certain value or less.
That is, as shown in FIG. 8, it is effective to detect a rise in the water level in the washing and dewatering tub 2 and gradually reduce the rotation speed of the washing and dewatering tub 2 from a predetermined rotation speed R3 to R4. The inventors have confirmed that

Next, the operation in the second step of spraying the washing water into the washing and dewatering tub 2 from between the outer tub 1 and the washing and dewatering tub 2 by the rotation of the washing and dewatering tub 2 will be described with reference to FIG. This will be described with reference to FIG.

As shown in FIG. 9A, the washing and dewatering tub 2
At time T1 "at which the water level in S3 reaches S3, this water level information is sent from the water level detection means 11 to the rotation speed setting means 27, and the rotation speed comparison means 28 is set in advance so as to have an appropriate rotation speed R5 according to the water level S3. The rotation speed comparing means 28 compares the output with the output of the rotation speed detecting means 26 and sets the conduction angle of the power switching means 15 by the conduction angle setting means 29, from time T1 "to time T2". During the period, the rotation speed of the washing and dewatering tub 2 is controlled to be R5.

As shown in FIG. 9A, the time T
When the water level in the washing and dewatering tub 2 rises to S4 due to the time change from 2 "to the time T3", the water level is sent from the water level detecting means 11 to the rotation speed setting means 27, and the water level S in the washing and dewatering tub 2 is increased.
A signal is sent to the rotation speed comparison means 28 so as to control the rotation speed to a rotation speed R6 corresponding to the rotation speed R4. The rotation speed comparing means 28 compares the output with the output of the rotation speed detecting means 26 and sets the conduction angle of the power switching means 15 by the conduction angle setting means 29. The motor 5 is driven so that the rotation speed of the water tank 2 becomes the rotation speed R6.
Control.

[0038] For this reason, the detergent can be dissolved at the same level at each water level, and the optimum amount of washing water can be sprinkled on the laundry.
Wash unevenness can be reduced.

In this embodiment, the number of revolutions of the washing and dewatering tub 2 is variable according to the water level of the first and second strokes, but at least one of the first and second strokes. In the above, the rotation speed of the washing and dewatering tub may be variable according to the water level in the washing and dewatering tub.

(Embodiment 3) The control means 24 in FIG.
In the third step, the rotation speed of the stirring blade 8 can be changed according to the water level in the washing and dewatering tub 2. Other configurations are the same as those of the second embodiment.

The operation of the above configuration will be described with reference to FIG. During the period from the start of washing to time ta1,
The first step of rotating the washing and dewatering tub 2 while supplying water so that the water level becomes S8 is executed. As a result, the supplied detergent dissolves quickly and soaks into the laundry.

As a washing method, a course in which only the third step of rotating the stirring blade 8 or a combination of the second step and the third step at a predetermined ratio is selected depending on the type of laundry or the type of clothes. When selected, the period ta12 from time ta1 to time ta2 is ta12 when only the third step is performed.
= 0. However, when a course in which the second and third steps are combined at a predetermined ratio is selected, the water level is set to S8.
With the rotation speed of the washing and dewatering tub 2 kept at R11, a second step of spraying washing water into the washing and dewatering tub 2 from between the outer tub 1 and the washing and dewatering tub 2 is executed.

As a result, the washing water is evenly sprinkled on the laundry, and at the same time, the washing water is sprinkled into the washing and dewatering tub 2.
Due to the centrifugal force generated by the rotation of the laundry, the laundry passes through and circulates and acts on the soil. By repeatedly performing the sprinkling and passing circulation of the washing water, dirt on the laundry is removed.

However, solid particle stains such as mud stains attached to the laundry cannot be removed only by the circulation of the washing water. Therefore, during the period from time ta2 to time ta3, the third step of operating the stirring blade 8 to stir the laundry is executed. During this period, the water supply valve 10 is operated to raise the water level in the washing and dewatering tub 2. At this time, a change in the water level in the washing and dewatering tub 2 is detected by the water level detection means 11.

The information of the water level detecting means 11 is sent to the rotation speed setting means 27, and the information of the proper rotation speed is sent from the rotation speed setting means 27 to the rotation speed comparing means 28.
8, the conduction angle of the power switching unit 15 is set by the conduction angle setting unit 29 by comparing the output with the output of the rotation speed detection unit 26, and the rotation speed of the motor 5 is controlled.

As a result, the water level in the washing and dewatering tub 2 becomes S8
The rotation speed of the motor 5 is controlled such that the rotation speed of the stirring blade 8 becomes P1 from S9 to S9, P2 from S9 to S10, and P3 from S10 to S11.

As described above, the rotation speed of the stirring blade 8 is changed in accordance with the water level in the washing and dewatering tub 2 in order to prevent damage caused by excessive stirring force applied to the laundry. It is. For example, when the water level at the start of the third step is set to S8 lower than a predetermined value in order to increase the concentration of the washing water in the washing and dewatering tub 2, from the viewpoint of washing, the high concentration of water is low. The state, the so-called low bath ratio state, is a preferable state for dirt removal.

However, from the viewpoint of damage to the laundry, rotating the stirring blade 8 at a high speed in a low bath ratio state may cause an excessive load on the laundry to cause damage. For this reason, in the state of a low bath ratio, it is preferable to set the rotation speed of the stirring blade 8 low. Water is supplied into the washing and dewatering tub 2 from the time ta2 to the time ta3, and as the relationship between the laundry and the washing water progresses from the low bath ratio to the high bath ratio, the rotation speed of the stirring blade 8 becomes P1, P2 and P3 gradually increase.

That is, as the bath ratio increases, the movement of the laundry by the operation of the stirring blades 8 can be performed smoothly, so that an excessive load is not applied to the laundry. By avoiding the mechanical force as much as possible, the frictional force on the surface of the laundry is reduced, and the washing effect that does not damage the laundry can be improved.

[0050]

As described above, according to the first aspect of the present invention, the washing and dewatering tub provided rotatably in the outer tub and the inner bottom of the washing and dewatering tub are rotatably provided. The operations of the provided stirring blades, water supply means for supplying water into the washing and dewatering tub, driving means for driving the washing and dewatering tub and the stirring blades, and the operations of the water supply means and the driving means are controlled to control the stroke. Control means, the control means comprising: a first step of rotating the washing and dewatering tub while supplying water; and a washing and dewatering tub from between the outer tub and the washing and dewatering tub by rotating the washing and dewatering tub. A second step of sprinkling washing water into the inside, and a third step of rotating the stirring blade, and a second step of rotating the washing and dewatering tub as a step following the first step. Only the third step of rotating the stirring blade, or the second step and the third step Since the process can be selected from a combination of predetermined ratios, in the first process, the detergent can be dissolved at the same time as the water supply is started, and the washing water can act on the stains on the laundry. The time can be used effectively, and in the second step, the washing water can be evenly sprinkled on the laundry to act on the dirt, thereby reducing unevenness in the washing of the laundry. The agitating blades can be rotated after the washing water has been applied to the soiling of the laundry or after the water has been sufficiently sprinkled. For this reason,
As a step following the first step, only the second step for rotating the washing and dewatering tub, only the third step for rotating the stirring blades, or the second step, depending on the type of laundry and the type of clothes. By selecting one of the combinations of the third step and the third step at a predetermined ratio, it is possible to select an effective washing method according to the stain of the laundry and the type of the clothes, and to secure the detergency. Washing unevenness can be reduced, and damage and entanglement of the laundry can be reduced by reducing the frictional force applied to the laundry.

According to the second aspect of the present invention, in the second step, the number of revolutions of the washing and dewatering tub can be varied according to the water level in the washing and dewatering tub. The optimal amount of washing water can be sprinkled on the laundry, and uneven washing can be reduced.

According to the second aspect of the present invention, in at least one of the first and second steps, the rotation speed of the washing and dewatering tub can be changed according to the water level in the washing and dewatering tub. Therefore, in the first step, the detergent dissolution can be made the same at each water level, and the resistance that hinders the rotation of the washing and dewatering tub increases due to the rise in the water level in the washing and dewatering tub. In addition, it is possible to prevent the power consumption of the driving means for driving the washing and dewatering tub from significantly increasing and to prevent the temperature from rising significantly. In the second step, the optimum amount of the washing water is sprinkled at each water level. And uneven washing can be reduced.

According to the third aspect of the present invention, in the third step, the rotation speed of the stirring blade can be changed according to the water level in the washing and dewatering tub, so that the stirring water flow is prevented from being entangled. By making the water flow and avoiding mechanical force to the laundry as much as possible, the frictional force on the surface of the laundry is reduced, and the washing effect can be improved by reducing the damage of the laundry.

[Brief description of the drawings]

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

FIG. 2 is a block circuit diagram of the washing machine.

FIG. 3 is an operation time chart of main parts of the washing machine.

FIG. 4 is a longitudinal sectional view showing an operation state of the washing machine in a second stroke.

FIG. 5 is a longitudinal sectional view showing an operation state of the washing machine in a third stroke.

FIG. 6 is a block circuit diagram of a washing machine according to a second embodiment of the present invention.

FIG. 7 is a block circuit diagram of a rotation control unit of the washing machine.

FIG. 8 is an operation time chart of main parts when the first step of the washing machine is executed.

FIG. 9 is an operation time chart of main parts when the washing machine is executed up to the second stroke.

FIG. 10 is an operation time chart of a main part of a washing machine according to a third embodiment of the present invention.

FIG. 11 is a longitudinal sectional view of a conventional washing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer tub 2 Washing and dehydration tub 5 Motor (drive means) 8 Stirrer blade 10 Water supply valve (water supply means) 14 Control means

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Shinji Matsuoka 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. F term (reference) 3B155 AA01 BA09 BB08 CA06 CB06 FA02 FA07 HC05 KA19 KA33 KB11 LA02 LA11 LA14 LB18 LC08 LC15 LC28 LC33 MA01 MA07 MA09

Claims (3)

[Claims] 1. A washing and dewatering tub rotatably provided in an outer tub, a stirring blade rotatably provided on an inner bottom portion of the washing and dewatering tub, and a water supply means for supplying water to the washing and dewatering tub. A driving unit for driving the washing and dewatering tub and the stirring blade; and a control unit for controlling operations of the water supply unit and the driving unit to control a stroke. The control unit includes a washing and dewatering tub while supplying water. A second step of sprinkling washing water from between the outer tub and the washing and dewatering tub into the washing and dewatering tub by rotating the washing and dewatering tub; and rotating the stirring blade. A third step of rotating the agitating blade, or a second step of rotating the agitating blade, as a step following the first step. It is possible to select any combination of the process and the third process at a predetermined ratio Washing machine. 2. The washing machine according to claim 1, wherein in at least one of the first and second steps, the rotation speed of the washing and dewatering tub can be changed according to the water level in the washing and dewatering tub. 3. The washing machine according to claim 1, wherein in the third step, the number of rotations of the stirring blade is variable according to the water level in the washing and dewatering tub.