JPH10201988A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine in which the wash is washed, rinsed, and spin dried in a drum furnished rotatably around a horizontal shaft, wherein generations of large vibrations and noises are precluded when the drum is driven at a high speed in the spin drying process by allowing the washing to attached to the inner wall of the drum uniformly before entering the spin drying process. SOLUTION: A drum 1 accommodating the wash is rotated round a horizontal shaft by the first motor 15 at the first revolving speed N1, and then rotated by the second motor 16 at the second revolving speed N2, wherein revolving speeds of the first and second motors 15 and 16 are controlled by a control device 20. Before driving at the second revolving speed N2, the control device 20 raises the drum revolving speed from the first revolving speed N1 at the first rate of speed rise, and then raises to a third revolving speed N3 at the second rate of speed rise.

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, rinsing and dehydrating laundry in a drum rotatably arranged about a horizontal axis.

[0002]

2. Description of the Related Art Conventionally, this type of washing machine has been configured as shown in FIG. Hereinafter, the configuration will be described.

[0003] As shown in the figure, a drum 1 has a large number of water passage holes 2 provided on the entire outer peripheral portion thereof, and is rotatably disposed in a water receiving tank 3. One end of a horizontal shaft 4 is fixed to the rotation center of the drum 1, and a drum pulley 5 is fixed to the other end of the horizontal shaft 4. The motor 6 is connected to the drum pulley 5 by a belt 7 and drives the drum 1 to rotate. A cover 8 is provided at the opening of the drum 1 so as to be freely opened and closed.

The water receiving tub 3 is provided with a spring body 1 from the washing machine body 9.
The washing machine is suspended at 0, and is supported by an anti-vibration damper 11 so that vibration during dehydration is not transmitted to the main body 9 of the washing machine, and a weight 12 for reducing vibration during dehydration is provided. The heater 13 heats the washing water in the water receiving tub 3. The control device 14 controls operations of the motor 6, the heater 13, and the like, and sequentially controls a series of processes such as washing, rinsing, and dehydration.

The operation of the above configuration will be described.
, The laundry is put into the drum 1 and the operation is started. In the washing process, the drum 1 is driven to rotate at a low speed by the motor 6, and the laundry in the drum 1 is lifted and dropped on the water surface. . Thus, the washing process proceeds. The same operation as the washing process is performed in the rinsing process. In the dehydration process, the drum 1 is driven to rotate at a high speed, and the laundry is centrifugally dehydrated. At this time, the laundry in the drum 1 is biased,
That is, when the imbalance occurs, the drum 1 and the water receiving tub 3 vibrate, but the vibration is attenuated by the vibration damper 11 and is not transmitted to the washing machine main body 9.

[0006]

In such a conventional configuration, the rotation speed of the drum 1 is about 53 rpm during the washing process.
In the dehydration process, the rotation speed is about 1000 rpm. When the laundry in the drum 1 enters the dehydration process in a tangled state in the washing process, the imbalance occurs because the laundry in the drum 1 is not evenly distributed in the dehydration process. When dehydration is started in an unbalanced state, a large vibration is generated at the rotation speed corresponding to the vibration resonance point of the water receiving tub 3 and the like, and when the vibration of the water receiving tub 3 is large, it hits the washing machine main body 9 and generates an impact sound. There is a problem that abnormal sound is generated, and further, the rotation speed of the drum 1 cannot be accelerated from the rotation speed corresponding to the vibration resonance point,
There was a problem that predetermined dehydration performance could not be obtained.

Further, even if the rotation speed of the drum 1 can be accelerated from the rotation speed corresponding to the vibration resonance point, when the drum 1 is rotated at a high speed, the laundry in the drum 1 may be unbalanced. Vibration of the water receiving tub 3 and the like becomes large, and this vibration is transmitted to the floor on which the washing machine is installed, and the whole floor vibrates, and there is a problem that the vibration generates a large noise.

The present invention has been made to solve the above-mentioned conventional problems. The laundry in the drum is almost evenly stuck to the inner wall of the drum before the dewatering process is started. The purpose is to avoid generating vibration and noise.

[0009]

According to the present invention, in order to achieve the above object, a drum containing laundry is driven by a motor at a first rotation speed and a second rotation speed around a horizontal axis. The control means controls the rotation speed of the drum at a first rotation speed increasing speed from the first rotation speed before the driving at the second rotation speed. The rotation speed is increased to a third rotation speed at a rotation speed increasing speed.

Thus, the laundry in the drum can be stuck to the inner wall of the drum almost uniformly before the dehydration step driven at the second rotation speed, and the drum is driven at a high speed during the dehydration step. Large vibration and noise can be prevented from being generated.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention is directed to a drum which stores laundry and is rotatable at least at a first rotation speed and a second rotation speed about a horizontal axis, and the drum. And a control unit for controlling the rotation speed of the motor, wherein the control unit sets the drum rotation speed to a first rotation speed from the first rotation speed before driving at the second rotation speed. The number of rotations of the drum is increased from the first number of rotations to the first number of rotations by increasing the number of rotations to the third number of rotations after increasing the number of rotations at the second number of rotations. The laundry in the drum rolls at a slightly lower rotation speed than the drum rotation speed, and the centrifugal force acts on the laundry as the rotation speed increases. When it is stuck on the inner wall of The majority of the laundry is in a state of stuck evenly. Thereafter, by increasing the rotation speed to the third rotation speed at the second rotation speed increasing speed, the laundry near the center of the drum can be stuck to the drum almost evenly. When driven at a rotation speed, it is possible to prevent large vibration and noise from being generated.

According to a second aspect of the present invention, in the first aspect of the present invention, the first rotational speed increasing speed is higher than the second rotational speed increasing speed, and the rotation speed of the drum is reduced. When the speed is increased at the first rotation speed increasing speed from the first rotation speed, most of the laundry in the drum becomes evenly stuck, and thereafter, the second laundry speed is lower than the first rotation speed increasing speed. By increasing the rotation speed of the drum at the rotation speed increasing speed, the laundry in the shape of a dumpling near the center of the drum can be evenly stuck to the inner wall of the drum.

According to a third aspect of the present invention, in the first or second aspect of the invention, the third number of revolutions is a number of revolutions at which the laundry sticks to the inner wall of the drum. The number of rotations is increased at a first rotation speed increasing speed from the first rotation speed, and then increased to a third rotation speed at a second rotation speed increasing speed, so that the laundry in the drum is transferred to the inner wall of the drum. You can maintain the state of evenly attached,
Thereafter, when the process shifts to the dehydration process, it is possible to prevent large vibration and noise from being generated.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, there is provided a cloth amount detecting means for detecting an amount of the laundry in the drum, and the control means comprises a laundry amount detecting means in the drum. And at least one of the first rotation speed increasing speed and the second rotation speed increasing speed is controlled in accordance with the amount of rotation of the drum, and the rotation speed of the drum is increased by the first rotation speed higher than the first rotation speed. Since the rolling state of the laundry in the drum when the speed is increased at the speed or the second rotation speed increasing speed varies depending on the amount of the laundry, the first rotation speed increases in accordance with the amount of the laundry in the drum. By controlling the speed or the second rotation speed increasing speed, it is possible to apply the laundry to the inner wall of the drum almost uniformly regardless of the amount of the laundry.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the motor includes a first motor that drives the drum at a first rotation speed and a second motor that drives the drum at a second rotation speed. And the second motor is driven by the first motor up to a third rotational speed. The first rotational speed is about 53 rpm, the second rotational speed is about 1000 rpm, and the third
Has a rotation speed of 80 to 100 rpm, and the speed can be easily controlled in the range of 53 to 100 rpm by the first motor.
Motor can be reduced in size.

According to a sixth aspect of the present invention, in the first aspect of the invention, when the laundry is a fiber or a blanket that easily shrinks, such as hair, the speed is increased at a speed higher than the first rotation speed increasing speed. The number of revolutions is increased to 3,
It is necessary to reduce the number of times of rolling due to the rotation of the drum for easily shrinkable fibers such as hairs, blankets, and the like. The number can be reached to prevent damage to the laundry.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

(Embodiment 1) As shown in FIGS. 1 and 2, a first motor (motor) 15 rotates the drum 1 at a first rotation speed N1 (for example, 53 rpm) to wash or rinse. The second motor (motor) 16 drives the drum 1 at a second rotation speed N2 (for example,
Spin at 1000 rpm) to dehydrate. The first motor 15 and the second motor 16 are constituted by induction motors, and are connected to driven pulleys 19 via belts 17 and 18, respectively.

The driven pulley 19 has two kinds of reduction ratios. The first motor 15 is connected via a belt 17 to a driven pulley 19a having a large reduction ratio.
6 through the belt 18 to the driven pulley 1 having a small reduction ratio
9b, and is fixed to the other end of the horizontal shaft 4 having one end fixed to the rotation center of the drum 1.

The control device 20 includes a first motor 15, a second motor 15,
The motor 16 is controlled as shown in FIG. The control means 21 is constituted by a microcomputer, and includes a heater 13, a first motor 15, a second motor 16, a water supply valve 23, a drain pump 2 through a power switching means 22 constituted by a bidirectional thyristor or the like.
4 and the like, and sequentially control a series of steps of washing, rinsing, and dehydration. The heater 13 heats the washing water in the water receiving tub 3, the water supply valve 23 supplies water to the water receiving tub 3, and the drain pump 24 drains the washing water in the water receiving tub 3.

The input setting means 25 is for inputting a required setting course, operation start, and the like required by the user. The display means 26 displays the contents set by the input setting means 25, the operation state, and the like. The water level detecting means 27 detects the water level in the water receiving tank 3, and the water temperature detecting means 28 detects the water temperature in the water receiving tank 3, and inputs the detected temperatures to the control means 21. The rotation speed detecting means 29
The number of rotations of the drum 1 is detected by detecting the number of rotations of the first motor 15, and is input to the control means 21. The storage means 30 stores data necessary for a series of controls. Here, 31 is a commercial power supply, and 32 is a power switch.

Before the dehydration process of driving the drum 1 at the second rotation speed N2, the control means 21 performs a cloth loosening process of driving the drum 1 at the first rotation speed N1, as shown in FIG.
From the first rotation speed N1 to the third rotation speed N3 (for example, 10
0 rpm), and a fourth rotation speed N4 at which dehydration is possible after the cloth balance process.
(For example, 200 rpm) and a dehydration process through a pre-dehydration process that is driven three times, and after the pre-dehydration process, an unbalance determination process that is driven at a third rotational speed N3 to detect and determine the imbalance of the laundry. I have to.

In the cloth balance process, the number of rotations of the drum is increased from the first rotation speed N1 to a first rotation speed increase speed (for example,
After increasing at a rate of 5 rpm per second), a second rotation speed increasing speed (for example, 1
At a rate of 2 rpm per second).

The rotation direction of the drum 1 during the cloth loosening process is set to the opposite direction to the rotation direction after the cloth balance process, and the third rotation speed N3 is set to the rotation speed at which the laundry sticks to the inner wall of the drum 1, and dehydration is possible. The fourth rotation speed N4 is a rotation speed lower than the rotation speed corresponding to the vibration resonance point of the water receiving tank 3 or the like.
Is driven by the second motor 16.

In the unbalance determination step, first, the number of revolutions of the first motor 15 is detected by the number of revolutions detecting means 29, and the first motor 15 is controlled to the third number of revolutions N3 by this detection output. The first motor 15 is driven with the conduction angle of the power switching means 22 fixed at this time. The state of the laundry in the drum 1 is determined based on the rotation speed fluctuation width of the first motor 15 when driven by the fixed conduction angle, and when the rotation speed fluctuation width is large, the laundry in the drum 1 is unbalanced. It is determined that it is in the state.

The operation of the above configuration will be described.
To open the laundry in the drum 1, and turn on the power switch 3.
After turning on the water supply valve 23, the start switch (not shown) of the input setting means 25 is operated to start the operation.
Operates to supply water, and when a predetermined water level is detected by the water level detection means 27, the water supply is stopped and the first motor 15 is driven. In the washing process, the drum 1 is driven to rotate at the first rotation speed by the first motor 15 while replenishing water because the laundry contains water, and the laundry in the drum 1 is lifted and falls on the water surface. Is done.

At this time, the heater 13 is energized to heat the washing water in the water receiving tub 3, and the water temperature in the water receiving tub 3 is detected by the water temperature detecting means 28, so that the temperature of the washing water is substantially constant. To control. When the washing process is completed, the drainage pump 24
Operates to drain the washing water in the water receiving tub 3. afterwards,
In the dewatering process via the rinsing process, the drum 1 is driven to rotate at the second rotation speed, and the laundry is centrifugally dewatered.

Next, the operation before the washing step or the rinsing step and before the dehydration step is started will be described with reference to FIGS. When the washing operation or the rinsing operation is completed in step 40 of FIG. 5 and the operation is started, a timer built in the control means 21 is started in step 41 and the operation of step 4 is started.
In step 2, the first motor 15 is turned on. At this time, the rotation speed of the drum 1 is set to the first rotation speed N1 (53 rpm), and the rotation speed detection means 29 detects the rotation speed of the first motor 15. Control. Therefore, the drum 1 is, as shown in FIG.
The cloth is rotated at the first rotation speed N1 to start the cloth loosening process.

At step 43, every predetermined time (for example,
The first motor 15 is turned on and off for 8 seconds on and 3 seconds off). When the time t1 has elapsed in step 44, the cloth balance process starts. At this time, the rotation direction of the drum 1 is opposite to the rotation direction of the drum 1 during the cloth loosening process.

When the time t2 has elapsed at step 45, the rotation speed of the drum 1 is increased at a first rotation speed increasing speed (5 rpm per second) at step 46. Step 47
When the time t3 (6 seconds from t2 to t3) elapses, the rotation speed of the drum 1 at this time becomes the rotation speed (for example, 83 rpm) stuck to the inner wall of the drum 1 when the amount of laundry in the drum 1 is small.
rpm).

After the time t3 has elapsed in step 47, the rotation speed of the drum 1 is increased in step 48 at a second rotation speed increase speed (increased by 2 rpm per second) lower than the first rotation speed increase speed. Even if the amount of laundry in 1 is a rated capacity, laundry can be stuck on the inner wall of drum 1 uniformly. If the time t4 (9 seconds from t3 to t4) elapses in step 49, the rotation speed of the drum 1 at this time should have reached the third rotation speed N3. If the rotation speed of the drum 1 has not reached the third rotation speed N3 in step 50, the timer is reset in step 51 and the process returns to step 41.

If the rotation speed of the drum 1 has reached the third rotation speed N3 in step 50, the first motor 15 is turned off in step 52, and then a preliminary dewatering process is performed.
In step 3, the second motor 16 is turned on. At this time, the second motor 16 drives the commercial power supply 31 with full conduction. For this reason, the laundry in the drum 1 is dehydrated, and can be firmly adhered to the inner wall of the drum 1. The second motor 16 is connected to the first motor 15 via belts 17 and 18, and the drum 1 is driven by the second motor 16.
Is detected by the rotation speed detecting means 29.

When the rotational speed of the drum 1 reaches the fourth rotational speed N4 in step 54, the second motor 1
6 is turned off, and in step 56, the rotation speed of the drum 1 is N4 '.
When the speed reaches (for example, 110 rpm), the process returns to step 53 until the predetermined number of times is reached, the second motor 16 is driven with the commercial power supply 31 in full conduction, the operation up to step 56 is repeated, and the laundry in the drum 1 is repeated. Is further dewatered and firmly adhered to the inner wall of the drum 1. Step 5
When the process is repeated a predetermined number of times (for example, three times) in step 7, the preliminary dewatering process is completed.

Thereafter, an unbalance determination process is started. In step 58, the first motor 15 is turned on, and the rotation speed of the drum 1 is set to the third rotation speed N3.
9, the number of rotations of the first motor 15 is detected, and the detection output controls the first motor 15 to control the number of rotations of the drum 1 to the third number of rotations N3.

When the time t5 has elapsed in step 59, the conduction angle of the power switching means 22 when the rotation speed of the drum 1 is controlled to the third rotation speed N3 is detected in step 60. Fixed to the first motor 1
5 is driven. Then, in step 61, the rotation speed fluctuation width at this time is detected by the rotation speed detection means 29.

The fluctuation range of the rotation speed detected in step 62 is compared with a predetermined value.
It is determined that the vibration and noise do not increase even in the dehydration process, and after the time t6 has elapsed in step 63, the process proceeds to the next process, that is, the dehydration process in step 64. If the fluctuation range of the rotation speed detected in step 62 is equal to or larger than the predetermined value, it is determined that the vibration and noise increase in the dehydration process, the timer is reset in step 65, and the process returns to step 41.

As described above, according to the present invention, before the dehydration step, the rotation speed of the drum 1 is increased from the first rotation speed at the first rotation speed increase speed, and then the second rotation speed increase is performed. Since the rotation speed is increased to the third rotation speed, if the rotation speed of the drum 1 is increased at the first rotation speed increasing speed from the first rotation speed, the laundry in the drum 1 will have the drum rotation speed. It rolls at a slightly lower rotation speed, and centrifugal force acts on the laundry with the increase in the rotation speed, and the laundry that is in contact with the drum 1 is more stuck to the inner wall of the drum 1 than the first rotation speed. When it is raised, most of the laundry in the drum 1 is stuck evenly. Thereafter, by increasing the rotation speed to the third rotation speed at the second rotation speed increasing speed, the laundry near the center of the drum 1 can also be adhered to the drum almost evenly, and the drum is moved to the second rotation speed in the dewatering process. When driven at a rotational speed of, a large vibration and noise can be prevented from being generated.

Further, since the first rotation speed increasing speed is higher than the second rotation speed increasing speed, if the rotation speed of the drum 1 is increased from the first rotation speed at the first rotation speed increasing speed, Most of the laundry in the drum 1 is in a state of being stuck evenly, and thereafter, the second rotation speed lower than the first rotation speed increasing speed.
By increasing the rotation speed of the drum 1 at the rotation speed increase speed, the dumped laundry near the center of the drum 1 can be evenly stuck to the inner wall of the drum 1.

In the present embodiment, after the cloth balance process, a preliminary dehydration process is performed at a fourth rotational speed N4 that can be dehydrated three times, and a laundry is driven at a third rotational speed N3 after the preliminary dehydration process. Although the dehydration process is started through an unbalance determination process that detects and determines the imbalance of the laundry, the laundry in the drum 1 is evenly stuck to the inner wall of the drum 1 during the cloth balance process. The dehydration step may be started without passing through the dehydration step and the unbalance determination step.

Although the first motor 15 and the second motor 16 are constituted by induction motors, they may be commutator motors or the like.

(Embodiment 2) Control means 21 in FIG.
Inputs the output of the rotation speed detecting means 29, and detects the amount of laundry in the drum 1 by a change in the coasting rotation speed of the drum 1 after the drum 1 is driven by the second motor 16. . At this time, since the change in the coasting speed of the drum 1 changes depending on the tension of the belts 17 and 18, the correction is made based on the change in the rotation speed of the drum 1 when driven by the second motor 16.

The control means 21 controls the first rotation speed increasing speed and the second rotation speed increasing speed in the cloth balance process according to the amount of laundry in the drum 1. Other configurations are the same as those in the first embodiment.

First, the operation of detecting the amount of laundry in the drum 1 will be described with reference to FIG.

Step 7: Put laundry in the drum 1
At 0, the operation is started. At step 71, the second motor 16 is turned on with full conduction, and the drum 1 is driven. When the rotation speed of the drum 1 becomes 200 rpm in Step 72, Step 7
At 3, the timer built into the control means 21 is started,
After 3 seconds have elapsed in step 74, the rotation speed N01 of the drum 1 at that time is detected in step 75, the amount of change ΔN1 from 200 rpm is stored, and the timer is reset in step 76. Here, the variation ΔN1 is ΔN1 = N01−200.

At step 77, the rotation speed of the drum 1 is 600
When the rotation speed reaches rpm, the second motor 16 is turned off in step 78. For this reason, the rotation speed of the drum 1 gradually decreases. At this time, the decreasing speed of the rotation speed of the drum 1
The number of rotations is correlated with the amount of laundry inside, and when the amount of laundry is large, the rotation speed decreases slowly, and when the amount of laundry is small, the rotation speed decreases rapidly.

In step 79, when the rotation speed of the drum 1 is 500
When the speed reaches rpm, the timer is started in step 80, and after 6 seconds have elapsed in step 81, the rotation speed N02 of the drum 1 at this time is detected in step 82, and 500 rpm
The amount of change ΔN2 from m is stored. Here, the change amount 変 化 N2
Is ΔN2 = 500−N02. Next, at step 83, the cloth quantity index Ga is calculated by the following equation.

Ga = 0.75 × △ N1 + △ N2 In the above equation, the first term on the right side corrects the influence of the tension of the belts 17 and 18, and the second term is the rotational speed of the drum 1 in 6 seconds. Represents a change from 500 rpm. Based on the calculation result, the amount of laundry in the drum 1 is determined in step 84 as shown in (Table 1). Since the first term on the right side of the above equation is affected by the voltage of the commercial power supply, if it is corrected according to the voltage of the commercial power supply,
Determination accuracy can be improved.

[0048]

[Table 1]

According to the amount of laundry in the drum 1 determined as described above, the first rotation speed increasing speed or the second rotation speed increasing speed in the cloth balance process is as shown in Table 2. ,Control.

[0050]

[Table 2]

When the amount of laundry in the drum 1 is small,
When the drum 1 is rotated, almost all of the laundry rolls along the inner wall of the drum 1, so that the laundry is in an area of a lower rotation number than the intermediate rotation number between the first rotation number and the third rotation number. Since the laundry sticks to the inner wall of the drum 1, as shown in (Table 2), the first rotation speed increasing speed is made slower than the second rotation speed increasing speed, so that the inner wall of the drum 1 can be shortened in a short time. It can be stuck evenly.

Further, when the amount of laundry in the drum 1 is large, when the drum 1 is rotated, even when the rotation speed is near the intermediate rotation speed between the first rotation speed and the third rotation speed, the center portion of the drum 1 is not rotated. It tends to be dumpling, and the second speed is higher than the first speed
By slowing down the rotation speed, the entire laundry can be evenly stuck to the inner wall of the drum 1.

In this embodiment, both the first rotation speed increasing speed and the second rotation speed increasing speed in the cloth balance process are controlled in accordance with the amount of laundry in the drum 1. However, only one of them may be controlled.

When the amount of laundry in the drum 1 is detected, specific numerical values such as the number of revolutions of the drum 1 and the time for detecting a change in the number of revolutions are described. It is used for explaining the example in an easy-to-understand manner, and is merely one example.

(Embodiment 3) The control means 21 in FIG.
In the case where the laundry is made of easily shrinkable fibers such as hair or blanket, the first rotation speed increasing speed and the second rotation speed increasing speed in the cloth balance process are made the same, and the rising speed is increased (for example, in one second). 10 rpm). Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described. When the laundry is to wash, rinse, and dehydrate fibers that tend to shrink, such as hair, the laundry is operated according to a program that does not shrink, and the laundry is washed, rinsed, and dehydrated. Driving on a blanket-washable program. Therefore, when these are to be washed, a corresponding washing course is set by the input setting means 25.

At this time, at the same time, the first rotation speed rising speed and the second rotation speed rising speed in the cloth balance process are made the same, and the rising speed is increased (10 rpm per second), so that the first rotation speed is increased in a short time. The number of rotations reaches 3, and damage to the laundry can be prevented.

[0058]

As described above, according to the first aspect of the present invention, the drum for storing laundry and rotatable at least at the first rotation speed and the second rotation speed around the horizontal axis. When,
A motor for driving the drum; and control means for controlling the number of revolutions of the motor, wherein the control means
Before driving at a rotation speed of 1, the drum rotation speed is increased at a first rotation speed increase speed from the first rotation speed, and then increased to a third rotation speed at a second rotation speed increase speed. From this, when the drum rotation speed is gradually increased at the first rotation speed increasing speed, most of the laundry in the drum is stuck evenly, and thereafter, the third rotation speed is increased at the second rotation speed increasing speed. By increasing the rotation speed of the drum, the laundry near the center of the drum can be stuck almost evenly to the drum. When the drum is driven at the second rotation speed in the dehydration process, large vibration and noise are generated. It can be prevented from occurring.

According to the second aspect of the present invention, since the first rotation speed increasing speed is higher than the second rotation speed increasing speed, the rotation speed of the drum is set to the first rotation speed higher than the first rotation speed. When the rotation speed is increased at the rotation speed increase speed, most of the laundry in the drum is uniformly attached, and then the rotation speed of the drum is increased at the second rotation speed increase speed lower than the first rotation speed increase speed. By increasing the number, the laundry in the shape of a dumpling near the center of the drum can be evenly stuck to the inner wall of the drum.

According to the third aspect of the present invention, since the third rotation speed is the rotation speed at which the laundry sticks to the inner wall of the drum, the rotation speed of the drum is set to the first rotation speed more than the first rotation speed. By increasing the rotation speed at the second rotation speed increasing speed to the third rotation speed after increasing the rotation speed at the second rotation speed increasing speed, it is possible to maintain the state in which the laundry in the drum is uniformly attached to the inner wall of the drum. After that, when the process shifts to the dehydration process, it is possible to prevent large vibration and noise from being generated.

According to the fourth aspect of the present invention, there is provided a cloth amount detecting means for detecting the amount of the laundry in the drum, and the control means controls the first amount in accordance with the amount of the laundry in the drum. Since at least one of the rotation speed increasing speed and the second rotation speed increasing speed is controlled, it is possible to apply the laundry to the inner wall of the drum almost uniformly regardless of the amount of the laundry.

According to the fifth aspect of the present invention, the motor includes a first motor that drives the drum at the first rotation speed and a second motor that drives the drum at the second rotation speed. ,
Since the first motor is driven by the first motor up to the third rotation speed, the first rotation speed is approximately 53 rpm, the second rotation speed is approximately 1000 rpm, and the third rotation speed is 80 to 100 rpm.
In addition, since the speed control may be performed in the range of 53 to 100 rpm by the first motor, the speed control is easy, and the speed control device and the first and second motors can be downsized.

According to the sixth aspect of the present invention, when the laundry is made of easily shrinkable fibers such as hair, blankets, or the like, the laundry speed increases to the third rotation speed at a speed higher than the first rotation speed rising speed. By increasing the rotation speed at a speed equal to or higher than the first rotation speed increasing speed, it is possible to reach the third rotation speed in a short time, and to reduce the number of rollings caused by the rotation of the drum. It is possible to prevent the laundry from being damaged.

[Brief description of the drawings]

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

FIG. 2 is a partially cutaway rear view of the washing machine.

FIG. 3 is a block circuit diagram of the washing machine.

FIG. 4 is an operation time chart of main parts of the washing machine.

FIG. 5 is an operation flowchart of a main part of the washing machine.

FIG. 6 is a flow chart at the time of detecting a cloth amount of the washing machine according to the second embodiment of the invention;

FIG. 7 is a cross-sectional view of a conventional dehydrating / washing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum 15 1st motor (motor) 16 2nd motor (motor) 21 Control means

Claims (6)

[Claims] 1. A drum for storing laundry and rotatable at least at a first rotation speed and a second rotation speed around a horizontal axis;
A motor for driving the drum; and control means for controlling the number of revolutions of the motor, wherein the control means
Before driving at a rotation speed of 1, the drum rotation speed is increased at a first rotation speed increase speed from the first rotation speed, and then increased to a third rotation speed at a second rotation speed increase speed. Washing machine. 2. The washing machine according to claim 1, wherein the first rotation speed increasing speed is higher than the second rotation speed increasing speed. 3. The washing machine according to claim 1, wherein the third rotation speed is a rotation speed at which the laundry sticks to the inner wall of the drum. 4. A laundry amount detecting means for detecting an amount of laundry in the drum, wherein the control means increases the first rotation speed increasing speed or the second rotation speed increasing according to the amount of laundry in the drum. 3. The washing machine according to claim 1, wherein at least one of the speeds is controlled. 5. A motor comprising: a first motor for driving a drum at a first rotation speed; and a second motor for driving a drum at a second rotation speed, wherein the first motor is driven up to a third rotation speed. The washing machine according to claim 1, wherein the washing machine is driven by a motor. 6. The washing machine according to claim 1, wherein when the laundry is a fiber such as hair which is easily shrunk, a blanket, or the like, the laundry is raised to the third rotation speed at a speed higher than the first rotation speed rising speed. .