JPH09122378A - Washing and dewatering machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing and dewatering machine which is prevented from abnormal vibration in dewatering operation. SOLUTION: A reflection type optical sensor 26 is mounted on an operation panel 16 and a reflection plate 28 on a tub cover 27 of a water receiving tank 5. In a process the revolution speed of a rotary tub 7 is increasing at the initial stage of dewatering operation, when radiation light from the optical sensor 26 becomes to be reflected by the reflection plate 28 according to the increasing vibration width of the rotary water tank, the dewatering revolution speed of the rotary tub 7 in the final stage is set to be lower than that in a normal operation. Thereby the generation of abnormal vibration of a housing 2 is prevented.

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 combined use of dehydration, which is capable of suppressing vibration of a main body during a dehydration operation.

[0002]

2. Description of the Related Art As is well known, in a washing machine for combined use of dehydration, an unbalance detecting lever is provided inside the main body so as to face the outer surface of the outer tub, and an unbalance detecting switch is turned on and off by the operation of the lever. It is provided to detect unbalance. In this product, when the outer tub swings largely due to the unbalanced rotation of the rotating tub due to the unbalanced distribution of laundry in the rotating tub during dewatering operation, this causes the unbalance detection lever to hit. The unbalanced detection switch operates,
The rotation of the rotary tank (the rotation of the motor) is stopped.

[0003]

However, in this conventional unbalance detection structure, the outer tank does not hit the unbalance detection lever depending on the whirling direction of the outer tank, and the rotation speed of the rotary tank increases as it is. It may go. In such a case, the rotary tank eventually rises to a normal high rotation speed, which causes abnormal vibration in which the outer box vibrates greatly and noise increases.

The present invention has been made in view of the above circumstances, and an object thereof is to reliably detect unbalanced rotation of a rotary tank regardless of the whirling direction of the outer tank.
(EN) It is intended to provide a washing machine for combined use of dehydration, which can perform dehydration operation while preventing abnormal vibration of the main body.

[0005]

[Means for Solving the Problems] A first means is a spin-drying washing machine in which an outer tub is swingably provided in a main body, and a rotating tub for both a washing tub and a dehydrating tub is provided in the outer tub, A vibration sensor for detecting the magnitude of vibration of the outer tub, and a motor for driving the rotary tub when the vibration sensor detects a vibration exceeding a reference value in the process of increasing the rotation of the rotary tub at the start of dehydration operation. Dehydration control means for controlling the final dewatering rotation speed to be lower than the normal speed is provided (Claim 1).

According to this means, in the process of increasing the rotation speed of the rotary tub at the start of the dehydration operation, if the rotary tub rotates unbalanced due to the unbalanced distribution of the laundry,
The outer tank vibrates due to unbalanced rotation of the rotary tank. When this vibration exceeds the reference value, the rotation speed of the motor is controlled so as to rotate at a speed lower than the normal final dehydration rotation speed, so that the outer tank is prevented from causing abnormal vibration. Therefore, the vibration of the main body is not likely to be abnormally large.

The second means is a spin-drying washing machine in which an outer tub is swingably provided in the main body, and a rotary tub which also serves as a washing tub and a dehydrating tub is provided in the outer tub. When a vibration sensor that detects a magnitude and a vibration that exceeds a reference value is detected by the vibration sensor in the rotation increasing process of the dehydration tank at the start of the dehydration operation, the final dehydration rotation speed of the motor that drives the dehydration tank is determined. Dehydration control means for controlling so as to be lower than in normal times is provided (claim 4).

According to this means, since the vibration of the main body is directly detected, it is possible to more reliably detect the unbalanced rotation that causes abnormal vibration when the motor is raised to the normal final dehydration rotation speed as it is.

According to a third aspect of the present invention, there is provided an outer tub capable of swinging in a main body, and a spin tub serving as both a washing tub and a dewatering tub is provided in the outer tub, wherein the dehydration and washing machine has a cloth quality of laundry. And a cloth quality detecting means for detecting the rotation speed of the motor, and at the start of the dehydration operation, the rotation speed of the motor is controlled to be decelerated after increasing the rotation speed of the motor to a first reference speed. When the measured time is less than the reference time corresponding to the cloth quality detected by the cloth quality detection means, the final dehydration rotation speed of the motor is set to be lower than the normal time. And a dehydration control means for controlling so as to lower the temperature (Claim 6).

According to the present invention, from the first reference speed to the second reference speed
The deceleration time up to the reference speed is determined by the degree of unbalanced rotation of the rotating tank.By measuring the deceleration time and comparing it with the reference time, abnormal vibration will occur when the motor is raised to the normal final spin speed. It is possible to detect an unbalanced rotation that causes In this case, the deceleration time of the rotating tub depends on the quality of the cloth (the degree of difficulty of dehydration varies depending on the quality of the cloth) even for the same amount of laundry, so it is a criterion to judge whether it is unbalanced rotation or not. I try to change the time depending on the quality of the cloth. Therefore, it is possible to more accurately detect whether or not the unbalanced rotation is performed.

[0011]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIGS. First, referring to FIG. 3 showing the entire structure of the washing machine for both dehydration and use, a main body 1 is constructed by mounting a top cover 3 on an upper part of an outer box 2. This body 1
A suspension rod 4 as a swing support means is swingably suspended in the outer box 2 of the above, and a water receiving tub 5 as an outer tub is provided with a compression coil spring 6 as an elastic support mechanism on the suspension rod 4. It is elastically supported through. Then, in the water receiving tank 5, a rotary tank 7 which is also used as a washing tank and a dehydrating tank is rotatably arranged.
An agitator 8 for generating a washing water flow is rotatably arranged at the inner bottom of the rotary tub 7.

A drain port 5a is provided on the outer peripheral side of the bottom of the water receiving tank 5.
Is formed, and the electric drain valve 9 is connected to the drain port 5a.
And the drain hose 10 is connected. In addition, an air trap 5b that exhibits a pressure according to the water level in the water receiving tank 5 is formed in a portion adjacent to the drain port 5a, and the water level sensor 11 provided in the top cover 3 is provided in the air trap 5b. It is configured to detect the water level in the water receiving tank 5 by the pressure.

A condenser-starting motor 12 and a drive mechanism 13 are disposed below the bottom of the water receiving tank 5, and the drive mechanism 13 brakes the rotary tank 7 by a brake mechanism (not shown) during washing and rinsing. The rotation of the motor 12 is transmitted to the agitator 8 while still in the (stationary state), and the agitator 8 is rotated. At the time of dehydration, the braking of the rotary tub 7 is released by the brake mechanism to rotate the motor 12 to the rotator 7 and the agitator 8.
Both of them are transmitted to rotate them integrally.

On the other hand, the top cover 3 is provided with a half-folded lid 14 for opening and closing the laundry entrance 3a (see FIG. 1). Further, a water supply valve 15 for pouring water into the rotary tank 7 (water receiving tank 5) is provided inside the rear portion of the top cover 3, and the front upper surface portion has an operation panel portion 16
(Details not shown).

FIG. 4 shows an electrical configuration. In FIG. 4, one ends of the coils 12a and 12b of the motor 12 are both connected to one terminal of an AC power supply 17, and the other ends are respectively connected via triacs 18 and 19. AC power supply 17
Is connected to the other terminal. The other ends of the coils 12a and 12b are also connected to one ends of other triacs 20 and 21, respectively.
The other end of is connected to the other terminal of the AC power supply 17 via the starting capacitor 22 in common.

Therefore, when the motor 12 is rotated in one direction (forward direction), the triacs 18 and 21 are turned on to energize the coil 12a without passing through the capacitor 22 and to the coil 12b through the capacitor 22. Energize. As a result, the motor 12 is activated and rotates normally. To rotate the motor 12 in the opposite direction, the triacs 19 and 20 are turned on to energize the coil 12b without passing through the capacitor 22 and energize the main coil 12a via the capacitor 22. As a result, the motor 12 starts and rotates in the reverse direction.

During washing and rinsing, the motors 12 are turned on by alternately turning on the triacs 18 and 21 and turning on the triacs 19 and 20.
Is rotated forward and backward to intermittently rotate the stirring body 8 forward and backward.
Further, at the time of dehydration, the triacs 18 and 21 are turned on to rotate the motor 12 in the forward direction so that the rotary tank 7 is rotated.
Is rotated forward.

The rotation speed (rotation speed) of the motor 12 is detected by a rotation sensor 23 formed of, for example, a Hall element, and the detection speed of the rotation sensor 23 is given to a control circuit 24. The control circuit 24 is configured to include a microcomputer and an A / D converter, and is supplied with signals from various switches (not shown) as well as signals from the water level sensor 11 and the like. Then, the control circuit 24 controls the drainage valve 9, the motor 12, the water supply valve 15 and the like on the basis of the input signals and the operation program stored therein, thereby controlling the washing operation, the rinsing operation and the dehydration operation. In particular, it also has a function as a dehydration control means for controlling the final dehydration rotation speed of the motor 12 (rotating tank 7) according to the magnitude of vibration of the water receiving tank 5 during dehydration.

That is, as shown in FIG. 1, inside the lower portion of the operation panel portion 16, there is arranged a circuit board 25 on which electronic components constituting the control circuit 24 are mounted. The reflection type optical sensor 2 is provided on the lower surface side of the circuit board 25.
6 is mounted, and a reflection plate 28 is attached to the upper surface of an annular tank cover 27 fitted inside the upper end of the water receiving tank 5.

The optical sensor 26 and the reflector 28 are
The vibration sensor 29 for detecting the magnitude of the vibration of the water receiving tank 5, that is, the amplitude in this embodiment, constitutes the optical sensor 26.
Infrared rays are radiated from the hole 30 formed in the bottom plate 16a of the operation panel section 16 toward the lower tank cover 27. Then, the reflection plate 21 is located at a position within the light concealed area of the optical sensor 20 when the water receiving tank 5 vibrates with an amplitude of 15 mm or more, specifically, the optical sensor 26 in the portion hidden by the operation panel unit 16. It is provided at a position 15 mm away from the position where the radiated light L of the above strikes.

Therefore, when the amplitude of the water receiving tank 5 is 15 mm or less, the optical sensor 26 receives almost no reflected light, so that the light detection level (voltage) is low, and the water receiving tank 5 is low.
Vibrates with an amplitude of 15 mm or more, it intermittently receives the infrared rays emitted by itself and reflected by the reflection plate 28, so that the light detection level becomes intermittently high.

The detection signal of the optical sensor 26 is the control circuit 2
4 given. Then, the control circuit 24 reads the output signal of the optical sensor 26 in the process of increasing the rotation speed of the rotary tank 7 at the start of the dehydration operation, and when the light detection level is lower than the reference value, that is, the amplitude of the water receiving tank 5 is the reference amplitude. Is 15 mm
If it is less than, it is determined that the amplitude of the water receiving tank 5 is small, and both coils 12a and 12b of the motor 12 are kept energized,
As shown in FIG. 6, the final dewatering rotation speed of the rotary tank 7 is a normal target rotation speed, for example, 1000 rpm (motor 12
The rotation speed is increased to, for example, 1800 rpm.

Further, the control circuit 24, when the light detection level of the light sensor 26 at the beginning of the dehydration operation is less than the reference value,
That is, when the amplitude of the water receiving tank 5 is not less than the reference amplitude of 15 mm, it is determined that the amplitude of the water receiving tank 5 is large, and the motor 1
A state in which both coils 12a and 12b of No. 2 are energized (hereinafter, all coils are energized) and the triac 20 is turned off to turn the coil 1
By repeating the state in which only 2a is energized (hereinafter referred to as main coil energization), the final dehydration rotation speed of the rotary tank 7 is lower than the normal target rotation speed, for example 85, as shown in FIG.
It is controlled to 0 to 900 rpm (1530 to 1620 rpm as the final spin speed of the motor 12). When the main coil is energized, the main torque of the motor 12 is smaller than the rotational load of the rotary tank 7, and the rotation speed of the rotary tank 7 decreases.

Since the optical sensor 26 is mounted on the circuit board 25, a lead wire for connecting the optical sensor 26 and the control circuit 24 is different from the case where the optical sensor 26 is arranged at another portion. Is unnecessary. Moreover, the optical sensor 2
6 is arranged in the operation panel unit 16, and the reflector 28 is also arranged below the operation panel unit 16, so that the optical sensors 2 can be arranged by the operation panel unit 16 as shown in FIG.
6 and the reflector plate 28 can be hidden so that they cannot be seen from the outside, and there is no risk that they will interfere with the entry and exit of laundry.

In addition, the hole 30 formed in the bottom plate 16a of the operation panel section 16 for transmitting infrared rays from the optical sensor 26 allows the water to pass through the tank cover 27 when the water enters the operation panel section 16. Since it functions as a drainage hole to be removed in the rotary tank 7, water does not remain accumulated in the operation panel section 16.

Next, the operation of the present embodiment configured as described above will be described with reference to the flowchart of FIG. 5 and the time charts of FIGS. 6 and 7. When the laundry is put into the rotary tub 7 and the operation is started, washing is first performed (step S1), and when the washing is completed, drainage is performed and water in the water receiving tub 5 is discharged (step S2). ,afterwards,
The first dehydration operation is started (step S3).

In the first dewatering operation, first, the motor 12 is activated with all coils energized to increase the rotation speed of the rotary tank 7. At the start of the dehydration operation in which the rotation speed of the rotary tank 7 gradually increases, the control circuit 24
Is constantly monitoring the light detection level of the light sensor 26 and the water receiving tank 5
It is determined whether the amplitude of is greater than or equal to 15 mm (step S4).

If the distribution of the laundry in the rotary tub 7 is not so unbalanced, the water receiving tub 5 does not vibrate so much. In this case, since the light detection level of the optical sensor 26 is low, the control circuit 24 determines that the amplitude of the water receiving tank 5 is less than 15 mm (the unbalance rotation degree of the rotating tank 7 is small) (“NO” in step S4). , Fig. 6
As shown in (4), the motor 12 is directly energized to all the coils, and the rotation speed of the rotary tank 7 is increased to 1000 rpm which is the normal final dehydration rotation speed, and this final dehydration rotation speed is maintained (step S5).

On the other hand, if the distribution of the laundry in the rotary tub 7 is unbalanced, the unbalanced rotation of the rotary tub 7 causes the vibration of the water receiving tub 5 to increase, and when the amplitude becomes 15 mm or more. Since the light emitted from the optical sensor 26 is reflected by the reflector 28, the optical detection level of the optical sensor 26 becomes high. Then, the control circuit 24 determines that the amplitude of the water receiving tank 5 is 15 mm or more (the degree of unbalance rotation of the rotating tank 7 is large) (“YES” in step S4, this determination time is indicated by t in FIG. 7), and thereafter. As shown in FIG. 7, by alternately repeating energization of all coils and energization of the main coil, the final dehydration rotation speed of the rotary tank 7 is controlled to be 850 to 900 rpm, which is lower than usual (step S6).

Specifically, the rotation speed of the motor 12 is detected by the rotation sensor 23 to detect the rotation speed of the motor 12.
At 20 rpm, energization of all coils is switched to energization of the main coil to reduce the rotation speed of the motor 12,
When the rotation speed of No. 2 is reduced to 1530 rpm, the operation of switching to the energization of all coils again and increasing the rotation speed of the motor 12 is repeated.

When the set time of the first dehydration operation has elapsed (“YE” at step S7 or step S8)
S "), the control circuit 24 disconnects the motor 12 and ends the first dehydration operation (step S9). After this, water receiving tank 5
A rinse step is performed for the first time of rinsing and rinsing water inside (step S10). When the rinse step is completed for this reason, drainage is performed (step S11), and the second dehydration operation is started after this drainage. (Step S12).

Even at the beginning of the second dehydration operation,
Similarly to the above, the control circuit 24 determines whether or not the amplitude of the water receiving tank 5 is 15 mm or more based on the light detection level of the optical sensor 26 (step S13). When it is less than 15 mm, the final dehydration rotation speed of the rotating tank 7 is determined. Is set to 1000 rpm (step S14), and when it is 15 mm or more, the final dehydration rotation speed of the rotary tank 7 is controlled to be 850 to 900 rpm (step S15).

When the set time for the second dehydration operation has elapsed (“YE” at step S16 or step S17)
S ”), the second dehydration operation is terminated (step S18), rinsing is performed for the second time (step S19), and drainage after completion of the rinsing for the second time (step S2).
0), the third dehydration operation is started (step S2).
1).

Even at the beginning of the third dehydration operation,
Similarly to the above, the control circuit 24 determines whether the amplitude of the water receiving tank 5 is 15 mm or more based on the light detection level of the optical sensor 26 (step S22). Is set to 1000 rpm (step S23), and when it is 15 mm or more, the final dehydration rotation speed of the rotary tank 7 is controlled to be 850 to 900 rpm (step S24). Then, when the set time of the third dehydration operation elapses (step S25 or step S
In 26, "YES"), the motor 12 is turned off to end the third dehydration operation (step S27), and the washing operation is ended with the end of the third dehydration operation.

As described above, according to this embodiment, the first to third
In each dewatering operation, the amplitude of the water receiving tank 5 is detected at the start of dewatering in which the rotation speed of the rotary tank 7 gradually increases, and when this is the reference amplitude (15 mm) or more, the final dehydration rotation speed of the rotary tank 7 is determined. Since it is controlled to be lower than usual, it is possible to prevent the vibration of the water receiving tank 5 from becoming abnormally large and prevent the problem that the main body 1 and especially the outer case 2 vibrate greatly and generate noise.

8 and 9 show a second embodiment of the present invention. The difference from the first embodiment is that the vibration sensor 31 comprises an acceleration sensor.
Is disposed on the tank cover 27 of the water receiving tank 7 below the operation panel section 16 at a portion hidden by the operation panel section 16, and the vibration sensor 31 and the control circuit 24 on the circuit board 25 are connected by the lead wire 32. It's just connected.

The vibration sensor 31, which is an acceleration sensor, directly detects the magnitude of vibration acceleration, which is a kind of vibration, and since the vibration acceleration has a certain correlation with the vibration amplitude, The vibration amplitude can be detected by detecting the vibration acceleration. Therefore, the control circuit 24 uses the acceleration corresponding to the amplitude of 15 mm as a reference value, compares the detected acceleration of the vibration sensor 31 with the reference value, and when the detected acceleration of the vibration sensor 31 is equal to or higher than the reference value,
The final dehydration rotation speed of the rotary tank 7 is set to 850 or lower than usual.
It is configured to control at 900 rpm. Even with this structure, the same effect as that of the first embodiment can be obtained.

FIG. 10 shows a third embodiment of the present invention, which is characterized in that a vibration sensor 33, which is an acceleration sensor similar to that of the second embodiment, is arranged at the bottom of the water receiving tank 5. is there. Then, the control circuit 2 on the circuit board 25
The lead wire 34 that connects the vibration sensor 33 and the vibration sensor 33 is attached to the outer box 2 by binding the lead wire 34 together with the plurality of lead wires 35 that connect the control circuit 24, the motor 12, the condenser 22, and the drain valve 9 to the outer box 2. ing. Even with such a configuration, the same effect as in the first embodiment can be obtained.

FIG. 11 shows a fourth embodiment of the present invention, in which a vibration sensor 37 including an acceleration sensor similar to that of the second embodiment is arranged on the bottom plate 16a of the operation panel section 16 of the main body 1. The control circuit 24 on the circuit board 25 is connected by a lead wire 38.

In this embodiment, unlike the above embodiments, the vibration sensor 37 can detect the vibration acceleration (vibration amplitude) of the main body 1 (outer box 2). Then, the control circuit 24
Compares the acceleration detected by the vibration sensor 37 with a reference value at the beginning of the start of each of the first to third dehydration operations in step S4, step S13, and step S22 of the flowchart shown in FIG.

In this case, the reference value to be compared with the acceleration detected by the vibration sensor 37 is set to the vibration acceleration such that the amplitude of the outer box 2 becomes 3 mm, and the control circuit 24 controls the steps S4, S13 and S13. In S22, when the acceleration detected by the vibration sensor 37 is equal to or higher than the reference value, it is determined that the amplitude of the outer box 2 is 3 mm or more, and the final spin-drying rotation speed of the rotary tank 7 is controlled to 850 to 900 rpm, which is lower than usual. It is configured.

FIGS. 13 to 17 show a fifth embodiment of the present invention, and portions different from the first embodiment will be described below. In this embodiment, the cloth quality of the laundry is detected before the washing process. This cloth quality detection is performed as follows.

That is, the control circuit 24 supplies water to the predetermined water level in the rotary tub 5 with the laundry loaded therein, and in this state, the motor 12 in the forward and reverse directions for a short time (for example, about 1 second).
The stirrer 8 is intermittently rotated in the forward and reverse directions by intermittently rotating the motor 12, and the load applied to the motor 12 is detected each time the motor 12 is driven, for example, by the number of rotations. And
The difference between the previous rotational speed and the current rotational speed is calculated, the rotational speed difference for each time is integrated, and the cloth quality is determined based on the magnitude of this integrated value.

The principle of this cloth quality judgment is as follows. That is, the laundry is agitated in the rotary tub 7, and the operation of approaching or contacting the agitator 8 or leaving the agitator 8 is repeated. At this time, if the laundry is made of a so-called thick and thick cloth such as jeans, when it comes close to or comes into contact with the agitator 8 due to the agitating movement in the rotary tub 7, a large resistance is exerted on the agitator 8. When the motor 12 is driven, the load is relatively light when it is separated from the agitator 8. Therefore, the load fluctuates each time the motor 12 is driven.

On the other hand, in the case of a standard item such as a shirt or underwear, or a supple item, a light load is exerted both when the object is close to or in contact with the stirring member 8 and when it is separated from the stirring member 8. The amount of load fluctuation is small. And
Since the magnitude of the load on the agitator 8 appears as the magnitude of the rotation speed of the motor 12, if the difference between the previous rotation speed and the current rotation speed is integrated every time, the integrated value will be accurate. It is possible to judge the quality of cloth. Therefore, the control circuit 24
Together with the rotation sensor 23 for detecting the number of rotations of the motor 12 function as cloth quality detecting means.

On the other hand, the unbalanced distribution of the laundry in the rotary tub 7 becomes the rotational resistance of the rotary tub 7, and the degree of the rotational resistance increases as the degree of unbalance increases. In view of such a situation, in the present embodiment, as shown in FIGS. 14 and 15, the amplitude of the water receiving tank 5 is set to the first reference speed (for example, 900 rpm) as the rotation speed of the rotating tank 7.
After that, the rotation tank 7 is decelerated to measure the time T required to decrease from the deceleration start to the second reference speed (for example, 850 rpm), and the measurement time T is determined according to the cloth quality. When the time is less than the reference time, it is determined that the rotating tank 7 is rotating unbalanced so much that abnormal vibration is caused.

Here, the control circuit 24 energizes all the coils when increasing the rotation speed of the rotary tank 7 to 900 rpm which is the first reference speed, and thereafter, the triac 18.
Is turned off to switch to the auxiliary coil energization in which only the coil 12b connected to the capacitor 22 is energized. The output torque of the motor 12 in the energized state of the auxiliary coil is equal to or lower than the dehydration no-load torque, so that the motor 12 is decelerated without fail.

On the other hand, even with the same amount of laundry, it is difficult to dehydrate with a rough cloth quality such as jeans, and the dehydration rate in the process of increasing the rotation speed of the rotary tub 7 is small. For this reason, in the case of a stiff cloth-like laundry, since it contains a lot of water and has a large inertial force, it takes a long time to decrease from the first reference speed to the second reference speed. On the other hand, a laundry having a standard cloth quality or a supple cloth quality is relatively easy to dehydrate, and the dehydration rate in the process of increasing the rotation speed of the rotary tub 7 becomes relatively large. For this reason, in a laundry having a standard cloth quality or a soft cloth quality, the inertial force becomes relatively small, and the time required to decrease from the first reference speed to the second reference speed becomes short.

FIGS. 16 and 17 show a decrease in the amount of laundry and a state of imbalance distribution between the first standard speed and the second standard speed for the rough cloth type laundry and the standard cloth type laundry. The results obtained by experiment for the time required for are shown below. It is understood from FIGS. 16 and 17 that the deceleration required time from 900 rpm to 850 rpm differs depending on the cloth quality even if the amount of laundry is the same, and that the stiff laundry takes a longer time. And water receiving tank 5
In the unbalanced rotation state in which the amplitude of 15 mm or more, the time required to decelerate from 900 rpm to 850 rpm is 5 Kg (maximum washing capacity). The maximum is less than 4 seconds, and the maximum is less than 3 seconds in the case of rough cloth-like laundry.

Therefore, in the present embodiment, if the cloth quality is stiff, it is judged as unbalance rotation when the time required to decelerate from 900 rpm to 850 rpm is less than 3 seconds, and the cloth quality is standard. Alternatively, in the case of a soft type, if the time required to decelerate from 900 rpm to 850 rpm is less than 4 seconds, it is determined to be unbalanced rotation.

Next, the operation of the above configuration will be described with reference to the flowchart of FIG. When the washing operation is started, the control circuit 24 first performs the cloth quality detection operation of supplying water to the predetermined water level in the rotary tub 7 and intermittently rotating the motor 12 forward and backward for a short time as described above ( In step S1), the cloth quality is determined based on the result, and the strength of the water flow during washing is set to the strength corresponding to the determined cloth chamber (step S2).

After that, the control circuit 24 judges whether or not the cloth quality judgment is "stiff" (step S3).
If “YES” in step S3, the washing in step S4 and drainage in step S5 are performed, and then the first dehydration operation is started in step S6. With all coils energized, the rotation speed of the rotary tank 7 is 900 rpm, which is the first reference speed.
Then, the motor 12 is switched to the auxiliary coil energization and the timer is operated to measure the time T required to decelerate to the second reference speed of 850 rpm.

Then, in step S7, the control circuit 24 determines whether or not this measurement time T is 4 seconds or more, which is the reference time, and if it is 4 seconds or more, the result is "YES". As shown in FIG. 14, the motor 12 is switched back to the energized state of all the coils again so that the final spin speed of the rotary tank 7 is 1000.
The speed is controlled to be rpm (step S8).

When it is determined "NO" in step S7, the control circuit 24 controls the rotary tank 7 as shown in FIG.
The motor 12 is controlled so that the final dehydration rotation speed of (1) becomes 850 to 900 rpm (step S9). Then, when the set time of the first dehydration operation has elapsed (“YES” in step S10 or step S11), the control circuit 24 ends the first dehydration operation (step S12) and shifts to rinse for the first time.

On the other hand, if "NO (standard or supple)" in this step S3, after washing in step S13 and draining in step S14, step S1
When the first dehydration operation is started at 5, first, the rotation speed of the rotary tank 7 is increased to 900 rpm as described above, and then,
The time T required to decelerate to 850 rpm is measured by switching the motor 12 to the auxiliary coil energization and operating the timer.

The control circuit 24 then proceeds to step S16.
Then, it is determined whether or not this measurement time T is 3 seconds or more, which is the reference time. If it is 3 seconds or more, "YES" is given and the motor 12 is energized again for all coils as shown in FIG. The final dehydration rotation speed of the rotary tank 7 is 100 after switching to the state.
The control is performed so as to be 0 rpm (step S17).

When it is determined to be "NO" in step S16, the control circuit 24 controls the motor 12 so that the final dehydration rotation speed of the rotary tank 7 becomes 850 to 900 rpm (step S18). Then, when the set time of the first dehydration operation elapses (step S19 or step S
In 20, "YES"), the control circuit 24 stops the first dehydration operation (step S21), and shifts to rinsing for the first time.

Thereafter, although not shown in FIG. 13, the first
In the second dehydration operation after completion of rinsing for the second time and the third dehydration operation after completion of rinsing for the second time, the final dehydration rotation speed of the rotary tank 7 is controlled in the same manner as described above.

Even with this structure, the same effect as that of the first embodiment can be obtained, and the deceleration reference time from the first reference speed to the second reference speed is changed according to the cloth quality. Unlike the case where the reference time is set to a fixed time regardless of the cloth quality, it is not an unbalanced rotation, but the final dewatering rotation speed is reduced as unbalanced rotation, resulting in insufficient dewatering, or unbalanced rotation. Despite this, it is possible to prevent the occurrence of the problem that the final spin-drying rotation speed is increased and abnormal vibration of the outer box 2 is caused because it is not unbalanced rotation.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following expansions and modifications are possible. The reflection plate 28 always reflects the radiated light of the optical sensor 26, and when the amplitude of the water receiving tank 5 exceeds 15 mm,
You may arrange | position so that it may shift | deviate to the position which does not reflect the emitted light of the optical sensor 26.

The triacs 18 to 12 control switching of the motor 12 to the coils 12a and 12b, and switching means for switching the rotational speed of the motor 12 by switching the coils 12a and 12b to main and auxiliary when energized. , But this may be changed to a contact switch.

When the vibration amplitude and vibration acceleration exceed the reference values at the beginning of the dehydration operation, the rotation speed of the rotary tank 7 at that time may be set as the final dehydration rotation speed. The dehydration operation can be more reliably performed while preventing abnormal vibration of the main body 1.

An unbalance detection lever is provided inside the outer box 2 so as to face the outer surface of the water receiving tank 5, and an unbalance detection switch that is turned on and off by the operation of this lever is provided. When it swings abnormally so much that it hits 2, it is detected by the unbalance detection lever and the unbalance detection switch is operated.
The motor 12 may be cut off.

[0064]

As described above, according to the present invention, the following effects can be obtained. In the invention of claim 1, when the vibration amplitude of the outer tub detected by the vibration sensor at the initial stage of the dehydration operation is equal to or higher than the reference value, the final dehydration rotation speed of the rotary tub is controlled to be lower than usual. The balanced rotation prevents dehydration of the main body while preventing dehydration.

According to the second aspect of the invention, the vibration sensor can be made invisible from the outside. In the invention of claim 3, since the optical sensor forming the vibration sensor is provided on the circuit board, the lead wire for connecting the optical sensor and the circuit board is unnecessary.

In the invention of claim 4, since the vibration of the main body is directly detected, the unbalanced rotation can be detected more accurately. In the invention of claim 5, when the vibration sensor detects the vibration exceeding the reference value, the dehydration is performed at the rotation speed of the rotary tank at the time of the detection, so that the abnormal vibration can be more surely prevented.

According to the sixth aspect of the invention, the unbalanced rotation is detected by comparing the time required for the rotary tank to decelerate from the first reference speed to the second reference speed with the reference time. Since it is made different depending on the cloth quality, it is possible to prevent the occurrence of abnormal vibration while preventing the occurrence of insufficient dehydration as much as possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing a first embodiment of the present invention.

FIG. 2 is a plan view of the main body with the lid removed.

FIG. 3 is an overall vertical side view.

FIG. 4 is a block diagram showing an electric circuit configuration.

FIG. 5 is a flowchart showing control contents.

FIG. 6 is a time chart showing changes in the rotation speed of the rotary tank and a motor energization mode under normal conditions.

FIG. 7 is a view corresponding to FIG. 6 in unbalanced rotation.

FIG. 8 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 9 is a diagram corresponding to FIG. 2;

FIG. 10 is a view corresponding to FIG. 3, showing a third embodiment of the present invention.

FIG. 11 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention;

FIG. 12 is a view corresponding to FIG.

FIG. 13 is a view corresponding to FIG. 5 showing a fifth embodiment of the present invention.

FIG. 14 is a view corresponding to FIG.

FIG. 15 is a diagram corresponding to FIG. 7;

FIG. 16 is a diagram showing the relationship between the amount of laundry and the time required for deceleration when the cloth quality is stiff.

FIG. 17 is a diagram showing the relationship between the amount of laundry and the time required for deceleration when the cloth quality is standard.

[Explanation of symbols]

In the figure, 1 is a main body, 5 is a water receiving tank (outer tank), 7 is a rotating tank, 8
Is a stirrer, 12 is a motor, 16 is an operation panel section, 23 is a rotation sensor (cloth quality detection means), 24 is a control circuit (dehydration control means, cloth quality detection means), 25 is a circuit board, 26 is an optical sensor, 27 is a tank cover, 28 is a reflector, 29, 31, 3
Reference numerals 3 and 37 are vibration sensors.

Claims (6)

[Claims] 1. A vibration sensor for detecting the magnitude of vibration of the outer tub, wherein an outer tub is swingably provided in the main body, and a rotating tub that also serves as a washing tub and a dehydrating tub is provided in the outer tub. When the vibration sensor detects a vibration exceeding a reference value during the rotation increasing process of the rotary tub at the start of the dehydration operation, the final dehydration rotation speed of the motor for driving the rotary tub is set to be lower than the normal speed. A washing machine for combined use of dehydration, which is provided with a dehydration control means for controlling. 2. The washing machine for combined use of dehydration according to claim 1, wherein the vibration sensor is provided at a position corresponding to a lower portion of an operation panel portion on an upper portion of the main body. 3. The vibration sensor includes a reflection type optical sensor mounted on a circuit board arranged in an operation panel section on an upper part of the main body, and a light emitted from the optical sensor provided on an upper part of the outer tank. The washing machine for combined use of dehydration according to claim 1, comprising a reflecting portion. 4. A vibration sensor for detecting the magnitude of vibration of the main body, wherein an outer tub is swingably provided in the main body, and a rotary tub that also serves as a washing tub and a dehydration tub is provided in the outer tub, When the vibration sensor detects a vibration exceeding a reference value in the process of increasing the rotation of the rotary tank at the start of the dehydration operation, the final dehydration rotation speed of the motor for driving the rotary tank is set to be lower than usual. A washing machine for combined use of dehydration, which is provided with a dehydration control means for controlling. 5. The dehydration control means detects the final dehydration rotation speed of a motor for driving the rotary tub when the vibration sensor detects a vibration exceeding a reference value in the process of increasing the rotation of the rotary tub at the start of the dehydration operation. The washing machine for combined use of dehydration according to claim 1 or 4, wherein the rotation speed is set to. 6. A cloth quality detecting means for detecting cloth quality of laundry, comprising an outer tub swingably provided inside the main body, and a rotating tub which also serves as a washing tub and a dehydrating tub is provided in the outer tub. At the start of the dehydration operation, control is performed such that the rotation speed of the motor is increased to the first reference speed and then the motor is decelerated, and the rotation speed of the motor is reduced to the second reference speed from the start of this deceleration. When the measured time is less than the reference time corresponding to the cloth quality detected by the cloth quality detection means, the final dehydration rotation speed of the motor is controlled to be lower than the normal speed. A washing machine for combined use of dehydration, which is provided with a control means.