JPH06114185A - Washing machine and its load quantity detecting device - Google Patents

Abstract

PURPOSE:To cleanly wash the washing without aggravating cloth damage even if the washing is added or a part thereof if taken out by detecting the quantity of the washing at the time when washing is being executed, deciding whether the quantity of the washing in a washing tank increases or decreases and looking over the contents of a washing condition again, and executing the changed washing condition. CONSTITUTION:In a washing/rinsing process, an inertial rotating state in a forward/ backward rotational motion of a stirring blade 14 is monitored by fetching an inertial rotational pulse, and by the inertial rotational pulse, how much the load quantity in a washing tank 6 is varied is decided. When the load quantity is varied, a variation of the load quantity and information of a time measuring means 40, etc., are fetched, and based on its timing the subsequent washing condition is corrected to a more appropriate a more appropriate one from a viewpoint of dirt removal, rinsability, cloth damage, water saving, electricity saving, etc., and washing of the remainder is executed under a new washing condition. In such a way, even if the washing is added or a part thereof is taken out, dirt removal is executed enough, and resources saving such as water saving and electricity saving can be realized without aggravating cloth damage.

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 automatically controlling a washing operation according to the amount of laundry.

[0002]

2. Description of the Related Art Recently, in washing machines, washing, rinsing,
There are provided automatic control of washing conditions such as dehydration according to the amount of laundry. This conventional washing machine determines the amount of laundry in the washing tub or the quality of the laundry (mainly stiff or soft) at the beginning of the washing process to determine the water level and agitation in the washing tub. It decides the outline of washing conditions such as washing, rinsing, dehydration, etc.

Further, in the control device for a washing machine disclosed in Japanese Patent Laid-Open No. 4-97782, a transmittance detector for detecting the light transmittance of the liquid in the washing tub and this transmittance detector are used. It controls washing, rinsing, and dehydration automatically based on the transmittance, and in washing, the transmittance from the transmittance detector when it is judged that the transmittance is saturated and the time from the start of washing to the saturation According to the above, a control means for controlling the washing time is provided, and based on the transmittance from the transmittance detector, a series of operations thereafter is controlled. Control the wash time.

Further, in the washing machine disclosed in Japanese Unexamined Patent Publication No. 3-234297, the judgment reference value is gradually increased due to variations in manufacturing and assembling of the drive mechanism and the transmission belt and changes with time due to long-term use. The amount of laundry may not be detected, and it may not be possible to accurately perform automatic control of laundry operation. Depending on the user, the water level in the washing tub and the washing time may be set by the manufacturer. Even if there is a desire to wash under conditions different from the above, it is possible to easily change the determination reference value in view of the problem that these cannot be easily dealt with.

[0005]

A conventional washing machine is a washing machine with water-soluble stains such as sweat, in which the adhering stain components do not contribute much to the transparency of the washing liquid, or the washing machine from the rinsing process after hand washing. The laundry you want to leave
Even if you add laundry to the laundry that you want to perform only the dehydration step by rinsing it separately by hand washing etc., even if you add laundry to the laundry during the intended operation, it will not be possible to remove the dirt, rinse, or dehydrate it sufficiently. Become.

Further, when the laundry is taken out of the washing tub while the process is in progress, it cannot be dealt with at all, and the laundry left in the washing tub is proceeded under the washing condition set in the initial washing stage. However, there is a problem that it promotes damage to the cloth, rinses too much, and dehydrates too much.

Further, although the conventional washing machine can easily change the washing conditions different from those set by the manufacturer, it cannot deal with the addition or removal of the laundry during the process. However, there is a problem in that the laundry cannot be washed cleanly and without promoting damage to the cloth, and sufficient rinsing and dehydration cannot be performed.

The present invention has been made to solve the above-mentioned conventional problems. In the washing, rinsing, or dehydration process, even if laundry is added or partially taken out, the laundry can be cleaned cleanly. It is an object of the present invention to provide a washing machine and a load amount detecting device for the washing machine which can perform washing without promoting damage to the cloth and saving resources of water and electricity.

[0009]

In order to solve the above-mentioned problems, the present invention provides a load amount detecting means for detecting the amount of laundry stored in a washing tub, and a washing operation based on the detected contents of the load amount detecting means. In a washing machine having a control means for setting the water level in the tub and washing conditions such as washing, rinsing, and dehydration process, and controlling the execution of the water supply valve, the discharge valve and the motor, the control means is set at the start of washing. After executing the specified washing condition, it is determined whether the amount of laundry in the washing tub is increased or decreased based on the detection content of the load amount detection means, the content of the laundry condition is reviewed, and the changed washing condition is executed. It is characterized by the fact that it has the following elements.

Further, the present invention is characterized in that it has change input means for instructing a change of the washing condition, and when the signal from the change input means is received, the detection content of the load amount detection means is fetched. It is a thing.

Further, the present invention has a lid for loading and unloading laundry, and a lid opening / closing detecting means for detecting an open / closed state of the lid. When a signal from the lid opening / closing detecting means is received, the load amount is changed. It is characterized in that the detection content of the detection means is fetched.

Further, the present invention has, for example, at least two washing means, a rinsing means, and a dehydrating means, as the washing means, and the control means determines the content detected by the load amount detecting means for each of the performing means. The execution condition of each performing means is set on the basis of each of the performing means, and each performing means executes each work based on each condition.

Further, the load detecting device of the present invention is characterized by detecting the rotational state of inertial rotation at the time of rotation stop at the time of switching the stirring blade or the washing tub from energization to disconnection. For example, the rotation state of inertia rotation is
It is characterized in that the determination is made from the rotation state of the motor for driving the stirring blade or the washing tub.

[0014]

According to the washing machine of the present invention, for example, even if the laundry is added or partially taken out in any of the washing, rinsing, and dehydrating processes, the washing amount is detected based on the content detected by the load amount detecting means. The washing, rinsing, or dehydration process conditions are reviewed according to the increase or decrease of the amount of laundry in the washing tub, and the changed conditions are executed. Without encouraging
Moreover, resource-saving washing can be performed.

Further, the load detection device for a washing machine according to the present invention utilizes the fact that the inertial rotation of the stirring blade or the washing tub decreases during washing and rinsing when the amount of laundry is large. Detect the amount of material. Further, at the time of dehydration, the amount of laundry is determined by utilizing the fact that the inertial rotation of the washing tub increases as the load amount increases.

[0016]

【Example】

Example 1. An embodiment of the present invention will be described below. 1, 2 and 3, reference numeral 1 is an outer box. This outer box 1
The outer tank 2 is supported by the anti-vibration support mechanism 3 inside. Inside the outer tub 2, a washing tub 6 having a large number of dehydration holes 4 in the side wall portion and storing the laundry 5 is provided rotatably around a vertical axis, and a driving motor 7 is provided at the outer lower portion of the outer tub 2. A belt 8, a clutch / deceleration mechanism 9, a drain valve 10, and a pressure guiding hose 13 communicating with a water level detecting means 12 for detecting the water level of the water 11 stored in the outer tub 2 are provided. Inside the washing tub 6, stirring blades 14 for stirring the laundry 5 and the water 11 stored in the washing tub 6 are provided so as to be reciprocally rotatable about the vertical direction.

The washing tub 6 and the stirring blade 14 are provided with the drive motor 7, the belt 8 and the clutch reduction mechanism 9.
Are designed to rotate under predetermined rotation conditions.

At the upper part of the drive motor 7, a permanent magnet 16 is provided on the motor shaft 15 and is opposed to the permanent magnet 16.
The casing 17 is provided with a power-generating coil 18, which is generally called a pilot generator. This pilot generator detects the rotating state of the stirring blades 14 and constitutes a load amount detecting means 20. ing.

In addition, on the upper part of the outer box 1, a lid 19 which can be opened and closed at a position corresponding to the upper opening of the washing tub, a lid opening / closing detection means 30 for detecting the open / closed state of the lid 19, and the washing tub. A water supply valve 21 for supplying water to 6 is provided.

Further, a control mechanism 2 is provided on the upper part of the outer box 1.
Two are provided. The control mechanism 22 includes a time measuring unit 40, and a display unit 50 including a neon lamp for visually recognizing a progress state and an input state of each washing process.
And calculate, set the conditions of each process of washing, rinsing, dehydration,
In addition, it is composed of a control means 70 and the like which gives an execution command.

Next, the load detecting means 20 will be described. When the motor shaft 15 rotates, the permanent magnet 16 fixed to the motor shaft 15 also rotates, so that a sinusoidal current is induced in the generator coil 18 in synchronization with the rotation of the permanent magnet 16, and this is electrically processed. To do. That is, when the motor 7 rotates, a pulsed electric signal is output in synchronization with this, so that the rotation state of the stirring blade 14 driven by the belt 8 by the motor 7 or the washing tub 6 can be detected. . Here, the number of SN poles of the permanent magnet 16 is increased, or a magnetic shield (not shown) that partially blocks the magnetic force of the permanent magnet 16 is provided in a part of the gap between the permanent magnet 16 and the power generation coil 18 which faces the permanent magnet 16. As a result, the rotational state detection capability of the load amount detection means 20, that is, the resolution can be improved.

FIG. 4 shows the washing of the load amount detecting means 20.
Alternatively, the amount of laundry in the rinsing process (hereinafter referred to as a load amount) and the inertial rotation pulse number of the motor 7 (after the motor 7 is rotated a predetermined number of times, the energization is stopped and the inertial rotation until the motor 7 almost stops) It shows the number of pulses generated at times), and the number of pulses increases as the load decreases. Further, when the water level in the washing tub 6 is high, the number of pulses increases even with the same load amount.

Further, the load amount-inertia rotation pulse number in the dehydration process has a characteristic that the pulse number increases as the load amount increases, as shown by the broken line in FIG.

The control means 70 fetches information from the water level detection means 12, the load amount detection means 20, the time measurement means 40, etc., and performs the washing conditions, that is, the water level in each process of washing, rinsing and dehydration, and the stirring conditions of the stirring blades 14. (Right of the stirring blade 14,
Set or correct the conditions for energizing the motor 7 to rotate to the left and to the right and to the left), the washing time, the number of rinses, water pouring and rinsing, and the rotating conditions and dehydration time during dehydration. To drive the display unit 50, the water supply valve 21, the drain valve 10, the motor 7, etc., which informs
Execute the washing conditions.

FIG. 5 is a flow chart for explaining the operation of the above washing machine, especially the control system. In step 100, when the power switch of the washing machine is turned on and started, the water supply valve 2 is inserted into the washing tub 6 based on the information of the water level detection means 12.
1 supplies water to a low water level.

In step 101, the stirring blade 14 is moved to the motor 7
The forward / reverse rotation drive of (1) stops the energization at a predetermined rotation angle, for example, a rotation angle of 270 ° at the time of energization, and determines that the inertial rotation of the stirring blade 14 is substantially stopped, and the motor 7 is rotated in the reverse direction. That is, the stirring blade 7 is rotated in the forward and reverse directions, and this is performed several times to obtain the average value of the inertial rotation pulse of the motor 7 in the inertial rotation, and according to FIG. Determine the amount.

In step 102, based on the load amount determined in step 101, the water level of the washing tub 6, the conditions of normal and reverse rotation of the stirring blades 14, the time for washing and rinsing, and the rinsing method for rinsing Rinsing-stirring with a predetermined water level stored, or water-pouring rinsing-stirring while overflowing water while supplying water), and all washing conditions such as the number of rotations of the washing tub 6 at the time of dehydration, time, that is, washing, Set various appropriate conditions in the process of rinsing and dehydration.

In step 103, the washing condition set in step 102 is executed.

In step 104, in the washing and rinsing process, the inertial rotation state in the forward and reverse rotational movements of the stirring blade 14 is monitored by capturing an inertial rotation pulse as shown in FIG. 6 (details will be described later with reference to FIG. 6). is doing. In step 105, it is determined how much the load amount in the washing tub 6 has changed by the inertial rotation pulse shown in FIG.

Step 106 determines whether the laundry has been completed.

In step 107, when the load amount changes in the above step 105, the load amount change information and the information of the time measuring means 40 and the like are fetched, and the timing (washing or rinsing process, washing or (How long has elapsed since the rinse started?)
Based on the above, the washing conditions after that are modified to be more appropriate from the viewpoints of dirt removal, rinsability, damage to cloth, water saving, resource saving of electricity saving, and the like.

In the washing machine having the above structure, the operation of the embodiment will be described with reference to the operation flowchart. Figure 5
First, the user who will explain will first load the laundry 5 in the washing machine 6.
If the detergent is added and the power switch is turned on, the process proceeds to step 100, where water is supplied into the washing tub 6 by the water supply valve 21, and if the water level reaches a low level, the water level detection means 1
Upon receiving the information of 2, the water supply valve is turned off, and the process proceeds to step 101. The load amount determination is executed in this step, and the load amount is determined to be about 2 kg from the inertial rotation pulse number A _{0 according} to FIG.

Then, the process proceeds to step 102, and appropriate washing conditions for a load of about 2 kg (for example, a washing step-a water level, a stirring angle of 270 °, a washing time of 9 minutes, and a rinsing step).
During the water level, 3 minutes of stirring, 2 times of rinsing, dehydration process-washing tub 800 rpm, dehydration time 4 minutes) are set.

In step 103, execution of the above washing conditions is started. First, water is supplied up to the medium water level, and when the water level reaches the medium water level, the water supply is stopped, stirring is started, and the detergent, water, and the laundry are oscillated and agitated to start removing dirt from the laundry.

In step 104, the number of inertial rotation pulses during stirring is monitored, and in step 105, it is determined whether the number of inertial rotation pulses has changed—the load has changed.

If there is no change in the load amount, the process proceeds to step 106. If the washing has not been completed yet, step 10
Returning to 3, the rest of the laundry is executed. When all the washing has been executed, the washing process ends.

When the user remembers that the laundry has been partially thrown in after the washing is started and the laundry is added during the washing process, as shown in FIG. (About 8 pulses), but B
The change to (about 3 pulses) is detected, and step 10
In step 5, it is determined that the load amount has changed, and step 10
Proceed to 7. It is determined from FIG. 4 that the laundry has increased from about 2 kg to about 3 kg, and the timing t ₁ at the time of addition is taken in from the information of the time measuring means 40, and the increase amount and the timing t ₁ indicate the subsequent washing conditions. Fix it. The water level is high, the wash time is extended by 5 minutes, the water level is high during rinsing, and one new rinse, one rinse with water, and a new wash condition with a dehydration time of 5 minutes are sent to step 102. In step 102, the contents of the cleaning conditions up to that point are rewritten. At this time, the display unit physically informs the user that the washing condition has been changed, such as light or sound.

Then, in step 103, the remaining washing is executed under the new washing condition.

[0039] user wash step near the end, going performed in handwashing rinsed and taken some of the laundry, the timing t _2, as shown in FIG. 6 at step 104
In the inertia rotation pulse number from C (about 7 pulses) to D
It is detected that there is a change (about 14 pulses), and step 1
In 05, it is determined that the load amount has changed, and step 10
Proceed to 7. In this step 107, it is judged from FIG. 4 that the laundry has decreased from about 3 kg to about 2 kg, and the decrease timing t ₂ is fetched from the information of the time measuring means 40.
The subsequent washing conditions are corrected based on the amount of decrease and the timing t ₂ .

As for the washing process, the rinsing process is as it is-agitating in the water level for 3 minutes, rinsing twice, dehydration process-washing tub 8
The re-corrected new cleaning conditions of 00 rpm and dehydration time of 4 minutes are sent to step 102. Then, in step 102, the contents of the washing condition are rewritten, and in step 103, the remaining washing is executed under the new washing condition.

Example 2. FIG. 7 is a block diagram of a control mechanism according to the second embodiment of the present invention. 60 in FIG.
Is a change input means that can instruct the washing machine to add or partially take out the laundry. The block diagram of the control mechanism shown in FIG. 7 corresponds to FIG. 3 shown in the first embodiment, except that the change input means 60 is added. FIG. 8 is an operation flowchart of this embodiment. In FIG. 8, reference numeral 110 denotes a step for determining whether or not there is a change in load amount such as addition or partial removal of laundry from the change input means 60. The operation flowchart shown in FIG. 8 corresponds to FIG. 5 described in the first embodiment, but in FIG. 5, the load amount is monitored in step 104, whereas in the second embodiment, step 104 is performed. Instead of the above, step 110 is provided, and the load amount is determined in step 114 when the change input means gives an instruction to change the load amount.

As described above, the second embodiment is shown in FIGS.
As shown in step 110, it is determined in step 110 whether the change input key, which is input when the user adds or removes laundry, is turned on, and step 114
In the above, in the change input means 60, the inertial rotation pulse is taken in at the time when the command of the previous step is received, the load amount in the washing tub 6 is determined, and the user instructs the addition or partial removal of the laundry by key input. Step 110 based on information
Then, the intention of the user is determined, and the load amount determination is executed at step 114 at that timing.

Example 3. FIG. 9 is a block diagram of a control mechanism according to the third embodiment of the present invention. In the figure, 30 is a lid opening / closing detecting means. The lid opening / closing means detects the open / closed state of the lid 19, and is arranged at a position above the outer box 1 where the opening / closing of the lid 19 can be detected, as shown in FIG. The block diagram of the control mechanism shown in FIG. 9 corresponds to FIG. 3 of the first embodiment and FIG. 7 of the second embodiment, except that the lid opening / closing detecting means 30 is provided.

Next, FIG. 10 is a diagram showing an operation flowchart of the third embodiment. In the figure, 120 is a step for detecting the opening / closing of the lid by the lid opening / closing detecting means 30. This embodiment focuses on the fact that the user has to open and close the lid 19 when adding or partially removing the laundry. That is, in step 120, the lid opening / closing detecting means 30 detects that the lid is opened during the execution of washing, and if the lid is opened, step 11
The load amount is decided in 4.

As described above, the third embodiment is shown in FIGS.
In step 0, when the user actually adds or partially takes out the laundry, it is determined in step 120 that the lid 19 has been opened based on the information from the lid opening / closing detection means 30, and at that timing, the process proceeds to step 114, The load amount determination is executed.

Example 4. FIG. 11 is an operational flowchart for explaining the fourth embodiment of the present invention. In FIG. 11, step 131 is based on step 101.
Set only the conditions for the washing process. Step 132 executes the contents of step 131. Steps 133 and 13
4 is the same as the above steps 100 and 101, but steps 135 and 136 set and execute the rinsing process conditions based on step 134.

After the rinsing process is completed, in step 137, the motor 7 is energized to bring the washing tub 6 into a predetermined rotation state, and then the motor 7 is deenergized. Step 138
Take in the inertial rotation pulse after the energization of the motor 7 is stopped.
The load amount at the start of dehydration is determined from the broken line of. Steps 139 and 140 set and execute dehydration conditions based on the contents of step 138.

The operation will be described with reference to FIG. When the user first puts the laundry 5 and the detergent into the washing tub 6 and turns on the radio wave switch, steps 100 and 101 are performed in the same manner as in the first embodiment. The load determination was about 2 kg as in Example 1. Step 1
In No. 31, the condition of the washing process (in the water level, the stirring angle of 270 °, the washing time of 9 minutes) is set based on the load of about 2 kg. Step 132 executes the conditions of the above washing process.

Steps 133 and 134 execute the same contents as steps 100 and 101. Then, the condition of the rinsing process is set based on the amount of laundry based on the load amount determination. Therefore, even if the user wash another hand of about 1 kg by hand washing, etc., and put it in the washing tub 6 in order to let the washing machine perform rinsing and dehydration, about 2 kg of the laundry which has been completed for washing up to now. About 3 combined with laundry
Appropriate rinsing conditions (high water level, one rinsing for water, one rinsing with water, and a stirring time of 3 minutes each) suitable for the amount of laundry of kg are set, and this content is executed in step 136.

Then, in step 137, the motor 7 is energized to bring the laundry 6 into a predetermined rotation state, and then the motor 7 is deenergized. Step 13
Reference numeral 8 takes in the inertial pulse after the energization of the motor 7 is stopped and judges the load amount at the start of dehydration from the broken line in FIG. And
In step 139, dehydration conditions are set based on this load amount. Since there was no additional reduction of laundry after rinsing this time, proper dehydration conditions for 3 kg of laundry and washing tub rotation speed of 80
0 rpm, dehydration time is set to 5 minutes, and in step 140,
The contents are executed, and all washing, rinsing and dehydration processes are completed.

Example 5. Although the washing machine has the three steps of washing, rinsing, and dehydrating in the above-described first to fourth examples, it is not necessary to have all three steps, and the first to fourth examples are performed. In the case of Example 3, the washing machine may perform only one of the washing process, the rinsing process and the dehydrating process. In addition, in the case of the fourth embodiment, there may be at least two strokes, and the load amount may be determined before each stroke to set the execution condition.

Example 6. In the above-mentioned Embodiments 1 to 4, the case where the washing machine has the steps of washing, rinsing and dehydrating has been described, but even when the washing machine has steps other than these three steps. I don't care. For example,
In the case where the washing machine also performs drying, how much heat and how much time is required in this drying process should be changed according to the amount of laundry in the washing tub. Therefore, it is possible to apply the operations described in the first to fourth embodiments to a washing machine having a new drying process. Not limited to the drying process, for example, the present invention can be similarly applied to a case where a disinfecting process for disinfecting laundry or a wrinkle extending process for extending wrinkles after drying the laundry is newly added. Is possible.

[0053]

As described above in detail, the washing machine according to the present invention detects the addition or partial removal of the laundry during the execution of the washing by the load amount detecting means, and based on the information, the subsequent washing condition. Correct and execute. In addition, each condition such as washing, rinsing, dehydration, etc. is set and executed based on the information of the load amount detection means each time, so that laundry is added in the washing, rinsing or dehydration process, etc. Even if a part of the laundry is taken out, both the added laundry and the remaining laundry are thoroughly cleaned, and it is possible to save resources of water and electricity without cleanly promoting the damage to the cloth.

Further, since the load amount detecting device for the washing machine according to the present invention is constructed so as to judge the load amount from the inertial rotation state of the agitating blade or the washing tub, it has a simple structure and at any time. The effect is that the load amount can be detected.

[Brief description of drawings]

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

FIG. 2 is a partial cross-sectional view showing the configuration of load amount detection means.

FIG. 3 is a block diagram of a control mechanism according to the first embodiment.

FIG. 4 is a load amount-inertia rotation pulse number characteristic diagram.

FIG. 5 is an operation flowchart of the first embodiment.

FIG. 6 is a time change characteristic diagram of the number of inertial rotation pulses.

FIG. 7 is a block diagram of a control mechanism according to the second embodiment.

FIG. 8 is an operation flowchart of the second embodiment.

FIG. 9 is a block diagram of a control mechanism according to the third embodiment.

FIG. 10 is an operation flowchart of the third embodiment.

FIG. 11 is an operation flowchart of the fourth embodiment.

[Explanation of symbols]

 1 Outer box 2 Outer tub 5 Laundry 6 Washing tub 7 Motor 11 Water 12 Water level detecting means 14 Stirring blade 19 Lid 20 Load amount detecting means 22 Control mechanism 30 Lid opening / closing detecting means 40 Time measuring means 50 Display section 60 Change input means 70 Arithmetic control means

Claims (5)

[Claims] 1. A washing machine having the following elements: (a) a washing tub for storing laundry, (b) a washing means for washing the laundry in the washing tub based on predetermined execution conditions, (c)
Load amount detecting means for detecting the amount of laundry stored in the washing tub during the execution of washing by the washing means, (d)
Control means for controlling the execution of the washing by changing the execution condition of the washing means during the execution of washing based on the content detected by the load amount detecting means. 2. The washing machine further comprises a change input means for instructing a change of the washing condition, and the control means fetches the detection content of the load amount detecting means in response to the change instruction from the change input means. The washing machine according to claim 1, wherein the washing machine is a washing machine. 3. The washing machine further comprises a lid for loading and unloading laundry, and a lid opening / closing detection means for detecting an open / closed state of the lid, and the control means is a lid from the lid opening / closing detection means. The washing machine according to claim 1, wherein the detection content of the load amount detection means is fetched by detecting the open / closed state of the washing machine. 4. A washing machine having the following elements: (a) a washing tub for storing laundry, (b) at least a washing means for washing the laundry, a rinsing means for rinsing the laundry, a dehydrating means for dehydrating the laundry, etc. A washing means having a plurality of performing means and performing at least two performing means in sequence on the basis of predetermined execution conditions to perform washing; (c) any one of a plurality of performing means of the washing means A load amount detecting means for detecting the amount of laundry stored in the washing tub, and (d) control for setting the execution condition of the executing means based on the content detected by the load amount detecting means. means. 5. A load detection device for a washing machine having the following elements: (a) a rotating member such as a stirring blade or a washing tub that acts on laundry by rotating, and (b) rotation of the rotating member. Stopping means, (c) Inertia detecting means for detecting the inertial rotation state of the rotating body by the stopping means.