JP2000102690A - All automatic washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration detection mechanism for a spinning tub of an all automatic washing machine that can correctly detect shake in any direction. SOLUTION: A resonant circuit including a resonant coil 31 and a condenser 32 is installed in upper outer periphery of a spinning tub 1 that is supported on outer box 3 by a hanging bar and a suspension 3 and is vibrating at dewatering. A detect coil 33 is installed in inter periphery of the outer box 3 being opposite to the vibration coil 31. By detecting changes of bonding strength of the two coils, vibration conditions of the spinning tub 1 can be understood. Namely, if the spinning tub 1 strongly shakes, the bonding strength between the detect coil 33 installed in the outer box 3 and the resonant coil 31 installed in upper part of the spinning tub 1 changes, and vibration detectors 40, 41 detect shakes of the spinning tub 1 based on the changes of the bonding strength and motor 6 may be stopped if necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully automatic washing machine.

[0002]

2. Description of the Related Art Generally, in a fully automatic washing machine, a water tub is suspended from an outer box by a suspension rod and a suspension, and is supported.
The motor is mounted on the bottom. The dewatering tub is provided concentrically inside the water tub so as to be doubled, and the pulsator provided at the bottom of the dewatering tub is connected to the motor, and the motor is rotated at high speed by the motor of the dewatering tub itself. Is joined to.

In such a fully automatic washing machine, when the spinning tub is rotated at a high speed during the spinning operation, when the cloth is unevenly distributed, the spinning tub is greatly shaken by the uneven load, and a large vibration is generated. Makes sound.

Therefore, conventionally, as shown in FIG.
Light emitting element 11 is placed in water tank 2 which vibrates together with dehydration tank 1 during dehydration.
The light receiving element 1 is attached to the outer case 3 side which is a non-movable part.
If the water tank 2 vibrates greatly together with the dewatering tank 1, the amount of light received by the light receiving element 12 receiving the light emitted from the light emitting element 11 fluctuates to a large or small amount. When the magnitude of the vibration is determined from the fluctuation of the received light amount by the vibration determining means 14 and it is determined that a large vibration is occurring, the motor control means 15
There is known an apparatus in which a signal for temporarily stopping the dehydration operation is given to suspend the dehydration (Japanese Patent Laid-Open No. Hei 10-5486).

[0005] Further, as shown in FIG. 18, when the dewatering tub 1 and the water tub 2 are greatly shaken during the dewatering operation, the safety lever 2 is moved.
1 and the safety switch 21 is
2 that operates to temporarily stop dehydration,
As shown in FIG. 19, the water tub 2 is greatly shaken together with the dewatering tub 1 and the vibration of the outer case 3 is transmitted by the vibration of the piezoelectric element 2.
3, the degree of swing of the dewatering tub 1 and the water tub 2 is calculated, and if it is considered that the vibration is large, a dewatering operation is temporarily stopped (Japanese Patent Application Laid-Open No. 3-68398).

[0006]

However, in the case of these conventional fully automatic washing machines, a large swing of the dewatering tub and the water tub is detected at one point where the light receiving element and the safety lever are installed. Therefore, there were the following problems. That is, due to the recent trend toward downsizing of the washing machine, the size of the outer box has been reduced, and the gap with the dewatering tub has also been reduced. Therefore, if the shaking of the dewatering tub is detected only at one point, there is a problem that a collision may occur at another place before detecting the shaking at the detecting point.

In order to detect the swing of the dehydration tub on all four front, rear, left and right surfaces, it is necessary to install a considerable number of detection elements on each surface.
The installation of the detection element narrows the gap between the outer box and the water tank, and there is a problem that it is necessary to stop the dehydration even with an acceptable small shaking. However, there was a problem that it became complicated and expensive.

[0008] Further, in the case of detecting the swing of the dehydration tub by the piezoelectric element, there is a problem that it is easily affected by the resonance mode of the outer case, and it is difficult to make an accurate judgment. In addition, since a piezoelectric element basically outputs by causing dielectric polarization when a force is applied, it becomes an output value with respect to acceleration, and cannot be detected unless the frequency of vibration is high to some extent. There was a problem that it was difficult to detect the shaking during the constant speed rotation immediately after the start of the rotation.

The present invention has been made in view of such conventional problems, and has a simple structure and an inexpensive configuration without reducing the distance between the water tank or the dewatering tank and the outer box. It is an object of the present invention to provide a fully automatic washing machine having a function capable of accurately detecting the swinging of the dehydration tub in four directions from a low-speed rotation.

[0010]

According to a first aspect of the present invention, there is provided a fully automatic washing machine comprising a pair of a resonance coil and a capacitor provided in a movable portion supported by a suspension rod and a suspension in a non-movable portion. A circuit, a detection coil provided on the non-movable part, which can be coupled to the resonance coil, and a vibration detection for judging a vibration state of the dehydration tub during the dehydration operation by detecting a coupling strength between the two coils. And a part.

In the fully automatic washing machine according to the first aspect of the present invention, if the movable section vibrates during the spin-drying operation, the coupling between the detection coil provided on the non-movable section and the resonance coil provided on the movable section. Changes in strength, and the vibration detecting unit detects the vibration of the dehydration tub based on the change in strength of the connection.

According to a second aspect of the present invention, in the fully automatic washing machine of the first aspect, the resonance coil has a diameter equivalent to a diameter of a fluid balancer attached to an upper part of a dewatering tub as the movable portion. And the detection coil is provided on an inner peripheral surface of a portion of the outer box that is the non-movable portion facing the resonance coil or on a lower surface of a portion of the upper cover that is the non-movable portion facing the resonance coil. Things.

According to a third aspect of the present invention, in the fully automatic washing machine of the second aspect, the resonance coil is provided on an upper peripheral surface of a dewatering tub as the movable portion.

According to a fourth aspect of the present invention, in the fully automatic washing machine according to the second aspect, the resonance coil is provided at an upper horizontal edge of a dewatering tub as the movable portion.

In the fully automatic washing machine according to the present invention,
Since the resonance coil and the detection coil are circular, they have no directionality and can detect displacement due to vibration in any direction.If the dehydration tub shakes during the dehydration operation, the displacement is large. The vibration can be detected by the vibration detecting section, and the excessive vibration of the dehydration tub can be detected appropriately and promptly.

According to a fifth aspect of the present invention, in the fully automatic washing machine according to the first aspect, the resonance coil is provided on an upper part of a water tub as the movable part so as to have a diameter equivalent to the diameter of the movable part, and the detection coil is provided. It is provided on the inner peripheral surface of a portion of the outer box that is the non-movable portion facing the resonance coil or on the lower surface of a portion of the upper cover that is the non-movable portion facing the resonance coil.

According to a sixth aspect of the present invention, in the fully automatic washing machine according to the fifth aspect, the resonance coil is provided on an upper peripheral surface of a water tub as the movable portion.

According to a seventh aspect of the present invention, in the fully automatic washing machine according to the fifth aspect, the resonance coil is provided at an upper horizontal edge of a water tub as the movable portion.

According to the fifth to seventh aspects of the present invention, similarly to the first aspect of the present invention, since the resonance coil and the detection coil are circular, they have no directionality and can detect vibration in any direction. Also, if the dehydration tub shakes during the dehydration operation, the vibration is transmitted to the outer tub as well as the dehydration tub, and oscillates with the dehydration tub. And excessive vibration of the dewatering tank can be detected appropriately and promptly.

According to an eighth aspect of the present invention, in the fully automatic washing machine according to any of the first to seventh aspects, the diameter of the detection coil is larger than that of the resonance coil. Sometimes the resonance coil with the largest displacement can come closest to the detection coil, and since the magnetic flux in the places where it comes close concentrates, the detection coil is strongly affected by this and detects the vibration of the dewatering tank with high sensitivity. be able to.

According to a ninth aspect of the present invention, in the fully automatic washing machine of the first to eighth aspects, the detection coil is provided so as to be in contact with the non-metallic portion of the non-movable portion, and the metal has a high magnetic permeability. Vibration can be detected with high sensitivity by reducing the ratio of magnetic flux passing through the portion.

According to a tenth aspect of the present invention, in the fully automatic washing machine according to any of the first to ninth aspects, the oscillation detecting unit oscillates at an oscillation frequency near a resonance frequency of the resonance circuit, and the resonance coil includes the oscillation coil. And a harmonic detection circuit for detecting a harmonic superimposed on the oscillation frequency by being close to the detection coil, and the vibration can be detected accurately and easily.

According to an eleventh aspect of the present invention, in the fully automatic washing machine according to any of the first to tenth aspects, the vibration detecting unit stops the dehydrating operation when detecting a vibration equal to or more than a predetermined threshold value during the dehydrating operation. It is provided with a control circuit that shifts to the loosening step, and can automatically average the uneven distribution of the cloth in the dewatering tank at the start of dewatering, and can smoothly start the dewatering rotation.

According to a twelfth aspect of the present invention, in the fully automatic washing machine according to the eleventh aspect, the control circuit changes the threshold value according to a rotation frequency. The vibration can be detected accurately.

The invention of claim 13 is the invention of claim 11 or 12
In the fully automatic washing machine, the control circuit has a non-volatile memory, and writes a unique value for each washing machine as the threshold value, to absorb individual differences for each washing machine, Accurate vibration detection can be performed with any washing machine.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of the structure of a fully automatic washing machine,
FIG. 2 is an exploded view. The water tank 2 and the dewatering tank 1 as movable parts are suspended and supported by suspension rods and suspensions 4 with respect to the outer box 3 as a non-movable part. Outer box 3
An upper cover 5 is attached to the upper part of the camera.

A motor 6 is attached to the bottom of the water tank 2, and a pulsator 7 driven by the motor 6 is arranged at the bottom of the dewatering tank 1. The motor 6 rotates the dewatering tub 1 at a high speed during the dewatering operation.

At the upper end of the dewatering tank 1, a fluid balancer 8 in which a fluid having a large specific gravity is sealed is attached.
Further, a brim-shaped water tank cover 9 is attached to the upper end of the water tank 2.

As shown in detail in FIG.
The resonance circuit 30 (FIG. 6)
A resonance coil 31 and a capacitor 32 (not shown in FIGS. 1 and 3) constituting the detection coil 3 are attached to the inner peripheral surface of the outer box 3 so as to face the resonance coil 31 and the capacitor 32.
3 is attached. As shown in FIG. 4, both the resonance coil 31 and the detection coil 33 are formed by printing a large number of coil wires 35 on a flexible substrate 34 so as to be linear and parallel to each other, and to form an annular shape. is there. However, a large number of coil wires 35 are formed as a whole by shifting and joining one by one at one end and the other end.

As shown in FIG. 1, a vibration detecting circuit 40 is connected to the detecting coil 33. When the vibration detecting circuit 40 detects the shaking of the dewatering tub 1, the dehydration is temporarily stopped. And a control circuit 41 for causing the motor 6 to perform a cloth loosening operation.

FIG. 5 shows the configuration of the vibration detection circuit 40. The vibration detection circuit 40 includes an oscillation circuit 42 having a circuit configuration shown in FIG. 6, a high-pass filter 43 for extracting a high-frequency signal superimposed on the oscillation circuit 42, and a high-pass filter 43.
Smoothing circuit 4 for smoothing the output of the circuit and extracting it as a voltage signal
4.

A more detailed configuration of the oscillation circuit 42 will be described with reference to FIG. The oscillation circuit 42 includes the detection coil 33
Is a Colpitts oscillation circuit which constitutes an LC sine wave oscillation circuit together with the capacitors C1 and C2. As shown in FIG. 7, when the dehydrating tub 1 as the movable part swings with respect to the outer box 3 as the non-movable part, the resonance coil 31 on the resonance circuit 30 side with respect to the detection coil 33 of the oscillation circuit 42. Will come close to and separate from each other due to the shaking of the dewatering tank 1.

The principle of detecting the vibration of the dewatering tub 1 by the vibration detection circuit 40 will be described with reference to FIGS. In the present embodiment, the resonance coil 31 constituting the movable part side resonance circuit 30 has a diameter of 400 mm to 500 mm, several tens of μH in several turns, and a capacitor 32 of about 10 ⁻² μH. Is provided. The detection coil 33 of the oscillation circuit 42 on the non-movable portion side has a diameter slightly larger than that of the resonance coil 31 and is 500 mm to 600 mm.

In such a circuit configuration, as shown in FIG.
Around the resonance frequency of 1, a sharp change is shown when the resonance coil 31 is close, and a gradual change is shown when the resonance coil 31 is far away.

Therefore, as shown in FIG. 9A, the oscillation circuit 42 near the frequency θ1 at which the inductance has a peak.
When the oscillation coil is oscillated, and the oscillation output signal OUT is viewed, when the resonance coil 31 of the resonance circuit 30 is separated from the detection coil 33 (when the dehydration tub 1 is located at the center of the outer box 3, The oscillation output signal OUT is substantially a sine wave when the amount is small, but when the resonance coil 31 on the side of the resonance circuit 30 is brought close to the detection coil 33 (the dehydration tub 1 swings greatly, )
Harmonic components appear as shown in FIG.

This oscillation output signal OUT is filtered through a high-pass filter 43 to extract a harmonic having a frequency approximately five times the oscillation reference frequency, and further converted into a DC voltage signal Vs by a smoothing circuit 44 and input to a control circuit 41. .

The control circuit 41 compares the voltage signal Vs, which is a vibration detection signal, with a preset threshold value Vr,
When the threshold value is exceeded, it is considered that a large swing has occurred in the dewatering tub 1 and the motor 6 is stopped once, and the cloth loosening operation conventionally performed is performed. To restart.

Next, the operation during the spin-drying operation by the fully automatic washing machine having the above configuration will be described. When shifting to the dehydration operation, the vibration detection circuit 40 is started, and the oscillation circuit 42 is switched to the resonance circuit 30.
Is oscillated at a frequency θ1 slightly shifted from the resonance frequency θo. At this time, the output frequency waveform of the oscillation circuit 42 is a sine waveform OUT1 as shown in FIG.

In this state, the control circuit 41 starts the motor 6 to start the rotation of the spin-drying tub 1. If the laundry is unevenly distributed in the spin tub 1 and an uneven load is generated, the spin tub 1 starts rotating while largely shaking.

Then, as shown in FIG. 7B, a state in which a part of the dewatering tub 1 is close to a part of the outer box 3 occurs. In this case, the distance between the resonance coil 31 and the detection coil 33 is partially reduced. As a result, a frequency waveform OUT2 on which harmonics are superimposed as shown in FIG. 9B is output from the oscillation circuit 42.

Therefore, the high-pass filter 43 of the vibration detection circuit 40 cuts the fundamental frequency component OUT1 from the frequency waveform OUT2 on which the harmonic is superimposed, and removes the harmonic component (from several times to about five times the fundamental frequency θ1). , And is converted into a DC voltage signal Vs by the smoothing circuit 44 and output to the control circuit 41.

The control circuit 41 compares the voltage signal Vs, which is a vibration detection signal, with a preset threshold value Vr. If the voltage signal Vs exceeds the threshold value, a large swing has occurred in the dewatering tub 1. Then, the motor 6 is stopped once, the cloth loosening operation is performed, and the dewatering operation is restarted in the same manner.

As described above, according to the first embodiment of the present invention, the resonance coil 31 is attached around the upper end of the dehydration tub 1 where the amplitude of the swing is the largest, and the resonance coil 31 is opposed to the resonance coil 31. Then, a detection coil 33 is attached to the inner peripheral surface of the outer box 3 so as to surround the periphery thereof. If a large swing occurs in the dehydration tub 1 due to an uneven load during dehydration, these resonance coils 31 come close to the detection coil 33. As a result, the strength of the coupling with the detection coil 33 changes, whereby the oscillation frequency waveform OU of the oscillation circuit 42 including the detection coil 33 changes.
A large change in T is taken out as a signal Vs to determine the necessity of the cloth loosening operation. Therefore, even if the spin-drying tub 1 is largely shaken in any of the front, rear, left and right directions at a low speed immediately after the start of spin-drying, the shaking is immediately performed. And control necessary to avoid collision can be performed, and the sway occurs more quickly than when the sway is detected by waiting for the dehydration tub to approach the location where the sensor is attached as in the past. Can respond.

Further, since the coils are mounted on the dewatering tub 1 side and the outer box 3 side, the narrow space between the dewatering tub and the outer box is further narrowed as in the case where a switch-like sensor is mounted on each of the four circumferential surfaces. Not even.

In the first embodiment, the resonance coil 31 is mounted on the side peripheral surface of the fluid balancer 8 above the dewatering tub 1. However, the mounting place is not limited to this. As shown by a dashed line A in FIG. 1 and as shown in FIG. 10, it is also possible to attach to the upper side peripheral surface of the water tank 2 which is also vibrated by the vibration of the dehydration tank 1. Thereby, the interval between the detection coil 33 attached to the inner peripheral surface of the outer box 3 can be shortened, and the sensitivity can be further increased.

Further, when the detection coil 33 is mounted on a metal part, the rate of the magnetic flux crossing the metal part passing through the metal part having a high magnetic permeability becomes high, so that the sensitivity becomes low. Therefore,
When the outer case 3 is made of metal, a detection coil 33 shaped like a brim is attached to the lower surface of the upper cover 5 which is a non-metal part as shown by a chain line B in FIG. 1 and as shown in FIG. The resonance coil 31 is mounted on the upper surface of the fluid balancer 8 above the dewatering tank 1. This resonance coil 31
As shown in FIG. 12 by a chain line C and shown in FIG. In any case, the diameter of the detection coil 33 is set to be larger than the diameter of the resonance coil 31.

In the case where each of the resonance coil 31 and the detection coil 33 has a brim type, the detailed structure is shown in FIG. That is, the coil 37 has a structure in which the coil 37 is printed and wired in a spiral shape with respect to the flexible substrate 36 shaped like a brim.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The fully automatic washing machine according to the second embodiment has the functional configuration of the control circuit 41 in the first embodiment shown in FIG. 1, and changes the rotation speed of the spin tub 1 according to the rotation speed of the spin tub 1. Change the vibration judgment threshold,
The feature is that the control method at the time of detecting vibration is changed.

FIG. 14 shows the internal configuration of the control circuit 41. The speed sensor 51 detects the rotation speed of the washing machine motor 6, and the rotation speed Rs detected by the speed sensor 51 is compared with the speed region determination reference 3 Hz. Rotation speed comparison unit 52,
Based on the comparison result of the rotation speed comparison unit 52, the vibration detection signal Vs of the dehydration tub 1 output by the vibration detection circuit 40 (having the same configuration as that of the first embodiment) is output to the first threshold Vr1,
Compared with any one of the second threshold values Vr2 (Vr2> Vr1), the motor control unit 54 includes a stop determination unit 53 that performs a motor stop determination when the vibration detection signal Vs is larger.

Next, the operation of the fully automatic washing machine of the second embodiment having the above configuration will be described with reference to the flowchart of FIG. The motor control unit 54 sends the speed command Fs to the motor 6
To start the dehydration operation (step S1).

When the spin-drying tub 1 starts rotating, the stop judging section 5
3, a vibration detection signal Vs indicating whether or not the dewatering tub 1 as a movable portion is close to the outer box 3 as a non-movable portion is input from the vibration detection circuit 40 by the same operation as in the first embodiment ( Step S2). At the same time, the rotation speed sensor 51 detects the rotation speed Rs of the motor 6 and inputs it to the rotation speed comparison unit 52 (step S3). 3H
It is compared whether it is larger than z and the comparison result is output to the stop determination unit 53 (step S4).

When the motor speed Rs is equal to or lower than the reference speed 3 Hz, the stop determination unit 53 determines that the second threshold value Vr2
And outputs a result of the determination to the motor control unit 54, and the motor control unit 54
If it exceeds r2, it is considered that a large swing has occurred in the dewatering tank 1, and the motor 6 is stopped once.
Control for shifting to the cloth loosening process is performed (step S5).

The stop judging section 53 also sets the motor speed Rs
Is higher than the reference speed 3 Hz, it is compared with the first threshold value Vr1, and the determination result is output to the motor control unit 54. The motor control unit 54 exceeds the first threshold value Vr1. In such a case, it is considered that a large swing has occurred in the dewatering tub 1, the motor 6 is stopped once, and control for shifting to the cloth loosening process is performed (step S6).

As described above, in the fully automatic washing machine according to the second embodiment, the threshold value for judging the motor stop is determined by Vr1 or Vr based on the rotation speed of the motor 6 during the spin-drying operation.
2 (here, Vr1 <Vr2), and a combination of the motor speed Rs and the vibration detection signal Vs is used for the first low-speed rotation region of the spin-drying operation for a large swing and a higher-speed region. Then, the motor stop judgment is performed even for a smaller vibration. Therefore, considering the vibration at the time of the normal spin-drying operation, when the rotation speed is higher than 3 Hz, the speed of the vibration is faster, so that the same displacement is obtained. In the detection of the amount, it is more likely that the dehydration tub will collide with the outer box and other non-movable parts as compared with 3 Hz or less, but in such a case, the rotation is stopped even for a smaller displacement. Therefore, it is possible to appropriately stop the dewatering operation in each of the vibration states where the probability of occurrence of a collision is high unless the motor is stopped.

Incidentally, also in the second embodiment, the mounting locations of the resonance coil 31 and the detection coil 33 can be changed in the same manner as in the first embodiment.

Next, a fully automatic washing machine according to a third embodiment of the present invention will be described with reference to FIG. Consideration is given to providing uniform performance and characteristics to electrical products by quality control. However, in particular, the rotation speed, balance, and center of gravity of the spin-drying tub of a fully automatic washing machine are inevitably delicately different for each product.

Therefore, in the third embodiment, a state in which the dewatering tub 1 collides with the outer box 3 and other non-movable parts is generated in advance at the factory shipment stage, and the electrical characteristic data in such a case is generated. The reference value is individually registered in a non-volatile memory (not shown) of the control circuit 41, and the purpose is to enable the collision prevention function to work properly in any product in practical use. The threshold value Vr is set.

That is, in the inspection process in the factory, the non-volatile memory of the control circuit 41 is made writable (step S11), and the dehydration tub 1 is tilted in the front, rear, left, and right directions to an angle to contact the outer box 3, or The entire washing machine is tilted in the front, rear, left and right directions, and the dehydration tub 1 is
, And the vibration detection signal Vs output from the vibration detection circuit 40 at that time is detected by the front, rear, left and right detection signals VF,
The data is collected as VB, VR, and VL data and written into the nonvolatile memory (steps S12 and S13).

In the control circuit 41, the data VF, VB, VR, V in the front, rear, left and right directions written in the nonvolatile memory
The output value Vs from the vibration detection circuit 40 in the normal state, that is, when the dewatering tub 1 is in a normal state, is set to Vm from the minimum value min (VF, VB, VR, VL) of L, and this value is subtracted. Is set to the threshold value Vr (step S1).
4).

Vr = min (VF, VB, VR, VL) −Vm As a result, in the fully automatic washing machine of the third embodiment, even if there is an individual difference at the time of shipment from the factory, the electrical power of each product is changed. In addition, parameters according to physical characteristics can be set, and optimal vibration detection and collision prevention can be performed for each product.

Note that in the third embodiment, the second
When the plurality of threshold values Vr1 and Vr2 are set according to the rotation speed of the dewatering tub 1 as in the embodiment, the value of Vm can be set in two stages.

[0062]

As described above, according to the first aspect of the present invention,
If the movable part vibrates during the dehydrating operation, the coupling between the detection coil provided on the non-movable part and the resonance coil provided on the movable part changes strongly, and the vibration detection part changes the strength of this coupling. Based on this, the vibration of the dehydration tub can be detected.

According to the second to fourth aspects of the present invention, since the resonance coil and the detection coil are circular, they have no directionality, and can detect displacement due to vibration in any direction. When shaking occurs in the water tank, the vibration of the upper part of the dewatering tub, which has a large displacement, can be detected by the vibration detection unit, and the appropriate vibration can be detected promptly and excessively.

According to the fifth to seventh aspects of the present invention, similarly to the first aspect of the present invention, since the resonance coil and the detection coil are circular, they have no directionality and can detect vibration in any direction. Also, if the dehydration tub shakes during the dehydration operation, vibration is transmitted to the outer tub together with the dehydration tub, and it shakes with the dehydration tub. Can be detected by the vibration detection unit, and the vibration of the dehydration tub can be detected appropriately and promptly.

According to an eighth aspect of the present invention, in the fully automatic washing machine of the first to seventh aspects, the detection coil has a diameter larger than that of the resonance coil. The large resonance coil can be closest to the detection coil, and the vibration of the dehydration tank can be detected with high sensitivity.

According to the ninth aspect of the present invention, in the fully automatic washing machine of the first to eighth aspects, the detection coil is provided so as to be in contact with the non-metallic portion of the non-movable portion. Vibration can be detected with high sensitivity by reducing the rate at which magnetic flux passes.

According to the tenth aspect, the first to ninth aspects
In the fully automatic washing machine, an oscillation circuit in which the vibration detection unit has an oscillation frequency near the resonance frequency of the resonance circuit, and a harmonic detection circuit that detects a harmonic superimposed on the oscillation frequency when the resonance coil is close to the detection coil Has
Vibration can be detected accurately.

According to the invention of claim 11, claims 1 to 1 are provided.
In the fully automatic washing machine of No. 0, since the vibration detection unit stops the dehydrating operation when detecting a vibration equal to or more than a predetermined threshold during the dehydrating operation, and includes a control circuit for shifting to a cloth loosening process,
The uneven distribution of the cloth in the dewatering tub at the start of dehydration is automatically averaged, and the dehydration rotation can be started smoothly.

According to the twelfth aspect of the present invention, in the fully automatic washing machine according to the eleventh aspect, the control circuit changes the threshold value according to the rotation frequency. Vibration can be detected.

According to the thirteenth aspect of the present invention, in the fully automatic washing machine of the eleventh or twelfth aspect, the control circuit has a non-volatile memory, and writes a unique value for each washing machine as a threshold value. Therefore, even if there is an individual difference for each product of the washing machine, accurate vibration detection can be performed with any of the washing machines.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view and a circuit diagram illustrating a configuration of a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the mechanical structure of the embodiment.

FIG. 3 is an exploded perspective view showing the dewatering tank and the outer box of the embodiment.

FIG. 4 is an exploded view of a resonance coil and a detection coil used in the embodiment.

FIG. 5 is a block diagram showing an internal configuration of a vibration detection circuit according to the embodiment.

FIG. 6 is a circuit diagram of the oscillation circuit in the above embodiment.

FIG. 7 is an explanatory diagram of the operation principle of the oscillation circuit in the above embodiment.

FIG. 8 is a graph showing operation characteristics of the detection coil in the embodiment.

FIG. 9 is an explanatory diagram illustrating output waveforms of the oscillation circuit in the above embodiment.

FIG. 10 is a perspective view showing a modified example of a mounting portion of the resonance coil according to the embodiment.

FIG. 11 is an exploded perspective view showing another modified example of the mounting position of the resonance coil and the detection coil of the embodiment.

FIG. 12 is a perspective view showing still another modified example of the mounting position of the resonance coil according to the embodiment.

FIG. 13 is a plan view showing the structure of a collar coil used in a modification of the above embodiment.

FIG. 14 is a block diagram showing a configuration of a control circuit according to a second embodiment of the present invention.

FIG. 15 is a flowchart of the operation of the control circuit in the embodiment.

FIG. 16 is a flowchart of an inspection process according to the third embodiment of the present invention.

FIG. 17 is a circuit block diagram of a conventional example.

FIG. 18 is a cross-sectional view of another conventional vibration detection sensor.

FIG. 19 is a cross-sectional view of another conventional vibration detection sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dehydration tank 2 Water tank 3 Outer box 4 Suspension 5 Top cover 6 Motor 7 Pulsator 8 Fluid balancer 9 Water tank cover 30 Resonance circuit 31 Resonance coil 32 Capacitor 33 Detection coil 34 Flexible board 35 Coil 36 Flexible board 37 Coil 40 Vibration detection circuit 41 Control Circuit 42 Oscillator 43 High-pass filter 44 Smoothing circuit 51 Speed sensor 52 Speed comparator 53 Stop determiner 54 Motor controller

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshiyuki Noguchi 3-3-9 Shimbashi, Minato-ku, Tokyo F-term in Toshiba Abu E Co., Ltd. 3B155 AA06 BA04 BB10 CA06 CB06 KA35 KB27 LA04 LB27 MA01 MA02 MA05 MA06 MA08 MA09

Claims (13)

[Claims] A resonance circuit provided on a movable portion supported by a suspension rod and a suspension on the non-movable portion, the resonance circuit including a pair of resonance coils and a capacitor; and the resonance coil provided on the non-movable portion. A fully automatic washing machine comprising: a detection coil that can be connected; and a vibration detection unit that determines the vibration state of the dehydration tub during the dehydration operation by detecting the strength of coupling between the two coils. 2. The resonance coil is provided in a fluid balancer section attached to an upper part of a dehydration tub as the movable section so as to have a diameter equivalent to the fluid balancer section. 2. The fully automatic washing machine according to claim 1, wherein the washing machine is provided on an inner peripheral surface of a portion of the box facing the resonance coil or on a lower surface of a portion of the upper cover that is the non-movable portion facing the resonance coil. 3. . 3. The resonance coil according to claim 2, wherein the resonance coil is provided on an upper peripheral surface of a dehydration tub serving as the movable portion.
Fully automatic washing machine according to the above. 4. The device according to claim 2, wherein the resonance coil is provided at an upper horizontal edge of a dewatering tub as the movable portion.
Fully automatic washing machine according to the above. 5. The resonance coil is provided on an upper part of a water tank which is the movable part so as to have a diameter equivalent to the diameter of the water tank, and the detection coil is opposed to the resonance coil of an outer box which is the non-movable part. 2. The fully automatic washing machine according to claim 1, wherein the washing machine is provided on an inner peripheral surface of the portion or on a lower surface of a portion of the upper cover that is the non-movable portion facing the resonance coil. 6. The fully automatic washing machine according to claim 5, wherein the resonance coil is provided on an upper peripheral surface of a water tub as the movable portion. 7. The fully automatic washing machine according to claim 5, wherein the resonance coil is provided at an upper horizontal edge of a water tub serving as the movable part. 8. The fully automatic washing machine according to claim 1, wherein the diameter of the detection coil is larger than that of the resonance coil. 9. The non-metallic part of the non-movable part, wherein the detection coil is provided to be in contact with the non-metallic part.
9. The fully automatic washing machine according to any one of 8 above. 10. The oscillation detecting section detects an oscillation circuit that oscillates at an oscillation frequency near a resonance frequency of the resonance circuit, and a harmonic that is superimposed on the oscillation frequency due to the proximity of the resonance coil to the detection coil. The fully automatic washing machine according to any one of claims 1 to 9, further comprising a harmonic detection circuit. 11. A control circuit for stopping the dehydrating operation when detecting a vibration equal to or more than a predetermined threshold value during the dehydrating operation, and for shifting to a cloth loosening step. The fully automatic washing machine according to any one of 1 to 10. 12. The fully automatic washing machine according to claim 11, wherein the control circuit changes the threshold value according to a rotation frequency. 13. The fully automatic washing machine according to claim 11, wherein the control circuit has a non-volatile memory, and writes a unique value for each of the washing machines as the threshold value.