JPH10201985A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine to make washing, rinsing, and spin drying of clothes within a drum installed rotatably around a horizontal shaft, in which generations of large vibrations and noises in the spin drying process are precluded by sensing the situation of the wash put in the drum before entering the spin drying process. SOLUTION: The wash is accommodated in a drum 1 and rotated round a horizontal shaft by the first 15 and the second motor 16 at the first and the second revolving speed, wherein the revolving speeds of the first motor 15 and second motor 16 are controlled by a control means provided in a control device 20. The control means senses the angle of electric continuity with which the drum 1 is controlled to the specified revolving speed and judges the situation of the wash in the drum 1 with the revolving speed varying width when the drive is made with this angle of electric continuity.

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. In addition to the occurrence of an abnormal sound, there has been a problem that the rotation speed of the drum 1 cannot be accelerated beyond the rotation speed corresponding to the vibration resonance point, and a predetermined dehydration performance cannot 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.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to detect the state of laundry in a drum before entering a dewatering process so that large vibration and noise are not generated in the dewatering process. I have.

[0009]

According to the present invention, in order to achieve the above object, laundry is stored in a drum, and at least at a first rotation speed and a second rotation speed by a motor around a horizontal axis. The motor can be rotated, and the number of rotations of the motor is controlled by the control means. The control means detects a conduction angle for controlling the drum to a predetermined rotation speed, and determines the state of the laundry in the drum based on a rotation speed fluctuation width when driven at this conduction angle.

[0010] Thus, the state of the laundry in the drum can be accurately detected by the fluctuation range of the rotation speed of the drum before entering the dehydration step, and it is determined whether or not the transition to the dehydration step is possible. Vibration and noise can be prevented.

[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 means for controlling the number of rotations of the motor, wherein the control means detects a conduction angle for controlling the drum to a predetermined rotation number, and rotates when the drum is driven at the conduction angle. The state of the laundry in the drum is determined based on the number variation width. When the imbalance of the laundry in the drum is large, the load applied to the motor is large, so that the motor is driven at the detected conduction angle. When the rotation speed fluctuation width is large and the imbalance is small, the rotation speed fluctuation width is small, so the state of the laundry in the drum can be detected based on the rotation speed fluctuation width, and whether or not to shift to the dehydration process is possible. To determine Can determines whether to transition to the dehydration step, a large vibration in the dehydration step, it is possible not to generate noise.

According to a second aspect of the present invention, in the first aspect of the present invention, the predetermined number of revolutions is a number of revolutions at which the laundry adheres to the inner wall of the drum. The state of the laundry in the drum can be determined based on the rotation speed fluctuation width at a predetermined rotation speed without changing the attached state, and the determination accuracy can be improved.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the control means detects a conduction angle for controlling the drum to a predetermined rotation speed, and drives the drum at the conduction angle. When the fluctuation range of the rotation speed is larger than a predetermined value, it is determined that the imbalance due to the laundry in the drum is large, and when the imbalance of the laundry in the drum is large, the load fluctuation applied to the motor is reduced. The rotation speed fluctuation width when driving at the detected conduction angle is large is large, and when the imbalance is small, the rotation speed fluctuation width is small.
Therefore, the state of the laundry in the drum can be detected from the rotation speed fluctuation range, and when the rotation speed fluctuation range is larger than a predetermined value, the imbalance due to the laundry in the drum is determined to be large, and the dehydration process is performed. The shift to へ is denied, and large vibration and noise can be prevented from being generated in the dehydration process.

According to a fourth aspect of the present invention, in accordance with the third 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 includes a cloth amount detecting means for detecting the amount of the laundry in the drum. When the amount of laundry in the drum is small, even if the laundry in the drum has the same imbalance, the predetermined value is changed according to the predetermined value. The effect of unbalance is greater than the inertia caused by the laundry, and the fluctuation range of the rotation speed is larger.However, when the amount of the laundry in the drum is large, the imbalance is caused by the drum and the laundry stuck evenly in the drum. Since the rotational speed fluctuation width is reduced due to inertia, the predetermined value for determining imbalance is changed according to the amount of laundry, so that vibration and noise in the dehydration process can be reduced regardless of the amount of laundry. Can be suppressed .

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the cloth amount detecting means detects the amount of the laundry when the laundry is dry at the start of the operation, and detects the amount of the laundry in the drum. The amount of the laundry can be determined at the beginning of the laundry, the amount of the laundry can be determined at the beginning of the washing, and the predetermined value for determining the imbalance can be changed according to the amount of the laundry from the first dehydration, and the vibration and noise can be changed. Can be suppressed.

According to a sixth aspect of the present invention, in the fourth aspect of the present invention, the control means includes: a cloth loosening step for driving the drum at the first rotation speed; A cloth balance process that gradually increases the rotation speed to the rotation speed,
A pre-dehydration step driven at a fourth rotation speed after the cloth balancing step; and an unbalance determination step driven at a third rotation speed after the pre-dehydration step to detect and determine imbalance of the laundry. The amount detecting means detects the amount of the laundry again in the preliminary dehydration step, and corrects the cloth amount based on the detection result.In the preliminary dehydration step, the laundry contains water,
By detecting the amount of laundry in this state, it is possible to detect the amount of laundry in a state that easily affects vibration and noise during the dehydration process, and correct the amount of laundry based on the detection result to determine imbalance. The predetermined value to be performed can be changed according to the amount of the laundry detected in the same state as the dehydration process, and the dehydration process can further reduce vibration and noise to perform dehydration.

According to a seventh aspect of the present invention, in the fourth aspect of the invention, when there is no cloth amount detection result, the control means sets a predetermined value to a minimum value. When there is no amount detection result, it is assumed that the amount of the laundry in the drum is unknown, and the predetermined value determined to be unbalanced is determined as the minimum value and the sharpest determination is performed. Dehydration can be performed without generating vibration and noise.

According to an eighth aspect of the present invention, in the third aspect of the present invention, when the laundry is a fiber or a blanket that easily shrinks, such as hair, a predetermined value is set to another value. Fiber that is easy to shrink, such as hair,
In the case of blankets, etc., compared to ordinary cotton, synthetic fibers, etc.
Since the size of the laundry and the degree of water absorption are different, by setting the predetermined value to another value, it is possible to perform dehydration without generating vibration and noise in the dehydration process.

According to a ninth aspect of the present invention, in accordance with the third aspect of the present invention, an input setting means for setting a washing course or the like is provided, and a predetermined value is changed by a special operation of the input setting means. Since vibration and noise during the dehydration process change depending on the condition of the floor where the washing machine is installed, vibration and noise are generated during the dehydration process by changing the predetermined values according to the installation conditions. It can be dehydrated without doing.

[0020]

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 to a driven pulley 19a having a large reduction ratio via a belt 17, and the second motor 1
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 by the user, and is input to the control means 21. 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 step of driving the drum 1 at the second rotation number N2, the control means 21 performs a cloth loosening step of driving the drum 1 at the first rotation number 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.

The rotation direction of the drum 1 during the cloth loosening process is set to be opposite to the rotation direction after the cloth balance process. The third rotation speed N3 is the rotation speed at which the laundry sticks to the inner wall of the drum 1. 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 rotation speed of the first motor 15 is detected by the rotation speed detecting means 29, and the first motor 15 is controlled to the third rotation speed N3 based on the 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 rotational speed fluctuation width of the first motor 15 when driven by the fixed conduction angle, and when the rotational speed fluctuation width is large (for example, 3 rpm or more), the inside of the drum 1 is Is determined to be in an unbalanced 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 rotated at a low speed by the first motor 15 while replenishing water because the laundry contains water, and the laundry in the drum 1 is lifted and dropped onto the water surface.

At this time, the heater 13 is energized to heat the washing water in the water receiving tub 3, and the temperature of the washing water 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 a high 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 in step 45, the rotational speed of the drum 1 is increased at a first increasing speed (for example, 5 rpm per second) in step 46. When the time t3 has elapsed in step 47, the rotation speed of the drum 1 at this time has reached the rotation speed (for example, 83 rpm) that sticks to the inner wall of the drum 1 when the amount of laundry in the drum 1 is small.

After the time t3 has elapsed in step 47, the rotational speed of the drum 1 is increased in step 48 to a second rising speed lower than the first rising speed (for example, 2 rpm per second).
And the laundry can be uniformly stuck to the inner wall of the drum 1 even if the amount of laundry in the drum 1 is the rated capacity. If the time t4 has elapsed in step 49, the rotation speed of the drum 1 at this time should have reached the third rotation speed N3. In step 50, the number of rotations of the drum 1 becomes the third
If the number of rotations N3 has not been reached, the timer is reset in step 51 and the process returns to step 41.

If the number of revolutions of the drum 1 has reached the third number of revolutions N3 in step 50, a pre-dehydration step is started. In step 52, the first motor 15 is turned off.
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 rotation speed of the drum 1 by the second motor 16 is detected by the rotation speed detecting means 29.

When the rotation speed of the drum 1 reaches the fourth rotation 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 '.
(E.g., 110 rpm) until step 57 repeats a predetermined number of times (e.g., three times).
The operation from step 3 to step 56 is repeated, and the laundry in the drum 1 is further dewatered and firmly adhered to the inner wall of the drum 1. When it is repeated a predetermined number of times in step 57,
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, and the conduction angle is fixed to the detected conduction angle. The first motor 15 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 (3 rpm). If the fluctuation range of the rotation speed is equal to or smaller than the predetermined value, it is determined that the vibration and noise do not increase even in the dehydration process. Then, after the time t6 has elapsed in step 63, the flow proceeds to the next step, that is, the dehydration step 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. Note that, when performing again, the number of times of driving at the fourth rotation speed N4 in the preliminary dehydration process is one.

As described above, according to the present invention, the rotational speed at which the laundry sticks to the inner wall of the drum 1 is controlled, the conduction angle at this time is detected, and the rotation speed fluctuation width when the laundry is driven at this conduction angle is used as the drum speed. Since the state of the laundry in the drum 1 is determined, the state of the laundry in the drum 1 can be detected based on the rotation speed fluctuation width in a state where the laundry is stuck to the inner wall of the drum, and the rotation speed fluctuation width can be detected. When the value is larger than the predetermined value, it is determined that the imbalance due to the laundry in the drum 1 is large, so that the shift to the dehydration process can be neglected, and large vibration and noise can be prevented from being generated in the dehydration process.

In the present embodiment, the second motor 16 is turned off when the rotation speed of the drum 1 reaches the fourth rotation speed N4 in the pre-dehydration process, and the pre-dehydration process is terminated when the rotation is repeated a predetermined number of times. Entering the unbalance determination process, the first motor 1
5, the second motor 16 is turned off after a predetermined number of repetitions, and when the unbalance determination process is started, the rotation speed of the drum 1 becomes, for example, 120 rpm.
m, the second motor is re-driven and the rotation speed of the drum 1 is controlled to gently increase to 100 rpm.
It becomes 0 rpm or less, and the laundry can be prevented from falling from the inner wall of the drum 1.

In the present embodiment, the first motor 15 and the second motor 16 are constituted by induction motors, but may be commutator motors or the like.

(Embodiment 2) Control means 21 in FIG.
In the state where the laundry is dry at the start of operation, the output of the rotation speed detecting means 29 is input, and the drum 1 is driven by the second motor 16 to change the coasting rotation speed of the drum 1 so that the inside of the drum 1 changes. The amount of laundry is detected. 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 changes a predetermined value for determining the imbalance due to the laundry in the drum 1 according to the amount of the 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]

In accordance with the amount of laundry in the drum 1 determined as described above, the control means 21 determines the imbalance due to the laundry in the drum 1 as shown in (Table 2). The predetermined value is changed.

[0050]

[Table 2]

Even if the laundry in the drum 1 has the same unbalance, when the amount of the laundry in the drum 1 is small, the drum 1 and the inertia due to the laundry stuck uniformly in the drum 1 are more unbalanced. Although the influence of balance is large and the rotational speed fluctuation width is large, when the amount of laundry in the drum 1 is large, the imbalance is canceled by the inertia of the drum 1 and the laundry stuck uniformly in the drum 1. Since the fluctuation range of the rotation speed is reduced, the predetermined value for determining the imbalance according to the amount of the laundry is changed as shown in (Table 2), so that regardless of the amount of the laundry, Vibration and noise can be suppressed.

Further, since the amount of laundry in the drum 1 is detected when the laundry is dry at the start of operation, and the amount of laundry in the drum 1 is used, the amount of laundry is determined at the beginning of the laundry. As a result, the predetermined value for determining imbalance can be changed according to the amount of the laundry from the first dehydration, and vibration and noise can be suppressed.

(Embodiment 3) Control means 21 in FIG.
Before the dehydration step of driving the drum 1 at the second rotation speed N2, as shown in FIG.
And the third rotation from the first rotational speed N1 to the third
And a fourth rotation speed N4 lower than the rotation speed corresponding to the vibration resonance point of the water receiving tank 3 or the like after the cloth balance process, in which the rotation speed is gradually increased to the rotation speed N3 (for example, 100 rpm). (For example, 150 rpm), and after this first preliminary dehydration step, a first unbalance that is driven at a third rotation speed N3 to detect and determine the imbalance of the laundry. Judgment process and the first
After the unbalance determination step, a second preliminary dehydration step driven at a fifth rotation speed N5 (for example, 500 rpm) higher than the rotation speed corresponding to the vibration resonance point of the water receiving tank 3 and the like, After the preliminary spin-drying step, the washing machine is driven at the third rotation speed N3 to enter the spin-drying step through a second unbalance determination step of detecting and determining the unbalance of the laundry.

When the laundry is dry at the start of operation, the control means 21 receives the output of the rotation speed detecting means 29 and drives the drum 1 by the second motor 16 to coast the rotation of the drum 1. The amount of laundry in the drum 1 is detected by a change in the number, and a predetermined value for determining imbalance is changed in a first unbalance determination step according to the detected amount of laundry. In the second pre-dehydration step, the amount of laundry is detected again, the amount of cloth is corrected based on the detection result, and in the second unbalance determination step, a predetermined value for determining the unbalance in accordance with the corrected amount of laundry. Is changing. Other configurations are the same as those in the first or second embodiment.

The operation of the above configuration will be described with reference to FIG. The operation up to the cloth balance process is the same as the operation of the first embodiment, and the description is omitted.

At time t4, the first motor 15 is turned off, the second motor 16 is driven in full conduction to enter the first preliminary dehydration step, and the rotation speed of the drum 1 is reduced to the fourth rotation speed N4 (150
When the rotation speed of the drum 1 reaches N3 (100 rpm), the first motor 15 is turned on to enter a first unbalance determination step. At this time, the rotation speed of the drum 1 is changed to the first rotation speed N3.
(100 rpm), the rotation speed of the first motor 15 is detected by the rotation speed detecting means 29, and the first motor 15 is controlled by the detection output.

After the time t5 has elapsed, 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, and the first motor is fixed at the detected conduction angle. 15 is driven. The rotation speed fluctuation width at this time is detected by the rotation speed detection means 29, and the detected rotation speed fluctuation width is compared with a predetermined value. At this time,
The predetermined value is changed as shown in (Table 2) according to the amount of laundry in the drum 1 determined at the start of the operation.

When the rotational speed fluctuation width is equal to or less than the predetermined value, the imbalance of the laundry in the drum 1 is small and the fifth rotational speed N5 is higher than the rotational speed corresponding to the vibration resonance point of the water receiving tub 3 or the like. It is determined that driving is possible, and after time t6 has elapsed,
The first motor 15 is turned off, the second motor 16 is driven in full conduction, and the second pre-dehydration step is started. If the rotation speed fluctuation width is equal to or larger than the predetermined value, it is determined that the motor cannot be driven at the fifth rotation speed N5 higher than the rotation speed corresponding to the vibration resonance point of the water receiving tank 3 or the like, and the process returns to the cloth loosening process.

When the rotation speed of the drum 1 reaches the fifth rotation speed N5 (500 rpm) in the second pre-dehydration step,
When the second motor 16 is turned off, the rotation speed of the drum 1 is reduced to N3.
(100 rpm), the first motor 15 is turned on, and the second unbalance determination process is started.

In the second pre-dehydration step, the second motor 1
6 in full conduction, and the rotation speed of the drum 1 is 200 rpm
, The rotation speed N of the drum 1 when 3 seconds have elapsed
01 is detected, and the amount of change ΔN1 from 200 rpm (here, ΔN1 = N01−200) is stored, and the drum 1
After the rotation speed of the drum 1 becomes 500 rpm and the second motor 16 is turned off, the rotation speed N02 of the drum 1 is detected when six seconds have elapsed since the rotation speed of the drum 1 became 450 rpm, and the change from 450 rpm is detected. Quantity △ N2 (where △ N2 =
450-N02), and 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 rotation speed of the drum 1 in 6 seconds. Represents a change from 450 rpm. Based on this calculation result, as shown in (Table 3),
The amount of laundry in the drum 1 is determined.

[0062]

[Table 3]

In the second preliminary spin-drying step, the laundry contains water, and by detecting the amount of the laundry in this state, the amount of the cloth is detected in a state in which vibration and noise in the spin-drying step are easily affected. can do.

In the second unbalance determination step, the drum 1
Is set to the third rotation speed N3 (100 rpm), the rotation speed of the first motor 15 is detected by the rotation speed detecting means 29, and the first motor 15 is controlled by this detection output. When the time t7 has elapsed, 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, and the first conduction angle is fixed to the detected conduction angle and the first motor 15 is driven. I do. Then, the rotation speed fluctuation width at this time is detected by the rotation speed detection means 29.

Next, the detected rotation speed fluctuation width is compared with a predetermined value. If the rotation speed fluctuation width is equal to or less than the predetermined value, the imbalance of the laundry in the drum 1 is small, and even if the dehydration process is started. Judging that vibration and noise do not increase, time t8
After elapse, the process proceeds to the dehydration process. At this time, as shown in (Table 4), the predetermined value depends on the amount of laundry in the drum 1 containing water determined in the second preliminary spin-drying process.
Change the predetermined value.

[0066]

[Table 4]

If the detected rotational speed fluctuation width is equal to or larger than the predetermined value, it is determined that vibration and noise increase when entering the dehydration process, and the process returns to the cloth loosening process.

As described above, according to the present invention, when the laundry is dry at the start of operation, the amount of the laundry in the drum 1 is detected, and the detected amount of the laundry is determined in the first unbalance determination step. The predetermined value for determining the imbalance is changed in accordance with the condition, and the amount of the laundry is detected again in the second preliminary dehydration step, and the amount of the laundry is corrected based on the detection result. Therefore, the predetermined value for determining the imbalance is changed in accordance with the corrected amount of the laundry, so that the predetermined value for determining the imbalance is determined according to the amount of the laundry detected in the same state as the dehydration process. It can be changed, and dehydration can be performed while suppressing vibration and noise in the dehydration process.

In this embodiment, when the rotation speed of the drum 1 reaches the fourth rotation speed N4 or the fifth rotation speed N5 in the first or second preliminary dewatering step, the second motor 16 is turned off. And enters the first or second unbalance determination step,
Although the first motor 15 is turned on, when the second motor 16 is turned off and the first or second unbalance determination process is started, the rotation speed of the drum 1 becomes, for example, 1
When the rotation speed of the drum 1 drops to 20 rpm, the second motor is driven again, and the rotation speed of the drum 1 is controlled to be gently 100 rpm. 1 can be prevented from falling from the inner wall.

(Embodiment 4) Control means 21 in FIG.
Sets a predetermined value to a minimum value (for example, 3 rpm) when there is no cloth amount detection result. Other configurations are the same as those of the second or third embodiment.

The operation in the above configuration will be described. When there is no result of cloth amount detection, the amount of laundry in the drum 1 is not known. Can drum 1
Regardless of the amount of laundry inside, dehydration can be performed without generating vibration and noise during the dehydration process.

(Embodiment 5) Control means 21 in FIG.
When the laundry is made of easily shrinkable fibers such as hair, blankets, or the like, the predetermined value is set to another value as shown in (Table 5). Other configurations are the same as those of the second or third embodiment.

[0073]

[Table 5]

The operation of the above construction will be described. When the laundry is made of easily shrinkable fibers such as hair, the size of the laundry, the degree of water absorption, and the like are different from those of ordinary cotton, synthetic fiber, and the like. In order to reduce the shrinkage of the object and to increase the rotation speed of the drum 1 in the dehydration process only up to 500 rpm, the predetermined value is set as shown in (Table 5), so that the imbalance in the dehydration process is achieved. In the determination process, when the fluctuation range of the rotation speed of the drum 1 becomes larger than a predetermined value, it is possible to prevent the process from returning to the fabric loosening process and performing the rebalancing process, and to perform dehydration without generating vibration and noise. be able to.

In the case of a blanket, it is easy to balance in the drum 1. By setting a predetermined value as shown in Table 5, fluctuations in the rotation speed of the drum 1 during the unbalance determination step in the dewatering step are obtained. When the width becomes larger than the predetermined value,
It is possible not to perform the process of returning to the fabric loosening process and rebalancing again, and it is possible to perform dehydration without generating vibration and noise.

(Embodiment 6) Input setting means 2 in FIG.
5 is a washing time setting switch 25 as shown in FIG.
a, rinsing number setting switch 25b, dehydration time setting switch 25c, course changeover switch 25d, start / pause switch 25e, etc.
Is constituted by a washing time display lamp 26a, a rinse count display lamp 26b, a dehydration time display lamp 26c, a course display lamp 26d, a course switching display lamp 26e, a remaining time display lamp 26f, and the like.

When the power switch 32 is turned on while the dewatering time setting switch 25c and the course changeover switch 25d are turned on at the same time, a mode for changing a predetermined value for judging imbalance in the unbalance judging process is entered. Other configurations are the same as those in the first or second embodiment.

The operation of the above configuration will be described. The dehydration time setting switch 25c and the course changeover switch 25
When the power switch 32 is turned on while d is simultaneously turned on, a mode for changing a predetermined value for determining imbalance is entered, "P10" is displayed on the remaining time display lamp 26f, and the rinsing number setting switch 25b is turned once. Each time it is turned on, the display of the remaining time display lamp 26f changes to “P11”, “P11”.
12 "," P13 ", and so on. Remaining time display lamp 2
The display of 6f and the predetermined value for determining the imbalance correspond as shown in (Table 6). By operating the rinse number setting switch 25b, the display of the remaining time display lamp 26f is changed. The predetermined value for determining the imbalance can be changed.

[0079]

[Table 6]

Therefore, by changing the predetermined value according to the installation state of the washing machine main body, etc., it is possible to perform dehydration without generating vibration and noise in the dehydration process.

[0081]

As described above, according to the first aspect of the present invention, the drum which stores laundry and is rotatable at least at the first rotation speed and the second rotation speed around the horizontal axis, and A motor for driving the drum, and control means for controlling the number of revolutions of the motor, wherein the control means detects a conduction angle for controlling the drum to a predetermined number of revolutions, and detects when the drum is driven at this conduction angle. Since the state of the laundry in the drum is determined based on the rotational speed fluctuation width, the state of the laundry in the drum can be accurately detected based on the rotational speed fluctuation width when driven at a constant conduction angle. In addition, it is possible to determine whether or not to shift to the dehydration step, and to determine whether or not to shift to the dehydration step, so that large vibration and noise are not generated in the dehydration step.

According to the second aspect of the present invention, the predetermined number of rotations is the number of rotations at which the laundry sticks to the inner wall of the drum, so that the state in which the laundry sticks to the inner wall of the drum does not change. The state of the laundry in the drum can be determined based on the rotation speed fluctuation width at a predetermined rotation speed, and the determination accuracy can be improved.

According to the third aspect of the present invention, the control means detects a conduction angle for controlling the drum to a predetermined rotation speed, and the rotation speed fluctuation width when the drum is driven at this conduction angle is a predetermined value. When the rotation speed fluctuation width is larger than a predetermined value, it is determined that the imbalance due to the laundry in the drum is large. The shift to the stroke can be ignored, and large vibration and noise can be prevented from being generated in the dehydration stroke.

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 sets the predetermined value in accordance with the amount of the laundry in the drum. Since it is changed, it is possible to suppress vibration and noise in the dehydration process regardless of the amount of laundry.

According to the fifth aspect of the present invention, the laundry amount detecting means detects the amount of the laundry when the laundry is dry at the start of the operation, and determines the amount of the laundry in the drum. The amount of the laundry can be determined at the beginning of the washing, and the predetermined value for determining the imbalance can be changed according to the amount of the laundry from the first dehydration, so that vibration and noise can be suppressed.

According to the invention described in claim 6, the control means includes a cloth loosening process for driving the drum at the first rotation speed, and gradually rotating the drum from the first rotation speed to the third rotation speed. The cloth balance step for increasing the number and the fourth after the cloth balance step
A pre-dehydration step driven at the number of rotations, and an unbalance determination step driven at the third rotation number after the pre-dehydration step to detect and determine the imbalance of the laundry. Since the amount of laundry is detected again in the stroke and the amount of cloth is corrected based on the detection result, it is possible to change the predetermined value for determining imbalance according to the amount of laundry detected in the same state as the dehydration process. It is possible to further reduce vibration and noise in the dehydration process and to perform dehydration.

According to the seventh aspect of the invention, when there is no cloth amount detection result, the control means sets the predetermined value to the minimum value.
Assuming that the amount of laundry in the drum is unknown, the predetermined value determined to be unbalanced is determined to be the sharpest as the minimum value, regardless of the amount of laundry in the drum, without generating vibration and noise during the dehydration process Can be dehydrated.

According to the eighth aspect of the present invention, when the laundry is a fiber or a blanket that easily shrinks, such as hair, the predetermined value is set to another value. In the case of easily shrinkable fibers, blankets, etc., the size of the laundry, the degree of water absorption, etc. are different from those of ordinary cotton, synthetic fiber, etc., so by setting the predetermined value to another value,
Dehydration can be performed without generating vibration and noise during the dehydration process.

Further, according to the ninth aspect of the present invention, since the input setting means for setting the washing course and the like is provided and the predetermined value is changed by a special operation of the input setting means, the vibration in the dehydrating process is changed. Since the noise also changes depending on the condition of the floor on which the washing machine body is installed, the dehydration can be performed without generating vibration and noise in the dehydration process by changing a predetermined value according to the installation situation. .

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

FIG. 8 is a front view of an operation display unit of a washing machine according to a sixth embodiment of the present invention.

FIG. 9 is a cross-sectional view of a conventional dehydrating and washing machine.

[Explanation of symbols]

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

Claims (9)

[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 detects a conduction angle for controlling the drum to a predetermined number of revolutions, and drives the drum at this conduction angle. A washing machine configured to determine the state of the laundry in the drum based on the rotational speed fluctuation width of the washing machine. 2. The washing machine according to claim 1, wherein the predetermined rotation speed is a rotation speed at which the laundry adheres to the inner wall of the drum. 3. The control means detects a conduction angle for controlling the drum to a predetermined rotation speed, and when the fluctuation range of the rotation speed when the drum is driven at the conduction angle is larger than a predetermined value, the control means detects the angle of the laundry in the drum. 3. The washing machine according to claim 1, wherein the balance is determined to be large. 4. The washing machine according to claim 3, further comprising a cloth amount detecting means for detecting an amount of the laundry in the drum, wherein the control means changes a predetermined value in accordance with the amount of the laundry in the drum. . 5. The washing machine according to claim 4, wherein the laundry amount detecting means detects the amount of the laundry in a state where the laundry is dry at the start of operation, and determines the amount of the laundry in the drum. 6. A cloth unraveling step for driving the drum at a first rotation number, a cloth balancing step for gradually increasing the rotation number from the first rotation number to a third rotation number, and a cloth balance step. A preliminary dehydration step driven at a fourth rotation speed after the step;
An unbalance determination step of driving at a third rotation speed after the preliminary spin-drying step and detecting and determining the unbalance of the laundry, wherein the cloth amount detecting means detects the amount of the laundry again in the preliminary spin-dry step, 5. The apparatus according to claim 4, wherein the cloth amount is corrected based on the detection result.
The washing machine as described. 7. When there is no cloth amount detection result, the control means:
The washing machine according to claim 4, wherein the predetermined value is set to a minimum value. 8. The washing machine according to claim 3, wherein the predetermined value is set to another value when the laundry is a fiber or blanket that easily shrinks such as hair. 9. The washing machine according to claim 3, further comprising input setting means for setting a washing course and the like, wherein the predetermined value is changed by a special operation of said input setting means.