JP3031628B2 - Washing and drying machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a washer / dryer, and more particularly, to a dehydration controller for a washer / dryer that performs washing to drying.

[Conventional technology]

Conventionally, a vibration control device of a drum type washing machine includes a motor rotation device for setting a drum speed as follows, for example, as described in Japanese Patent Publication No. 50-16099, that is, laundry is rolled in the drum. It is equipped with a motor rotating device that is set to a low speed of about and a high speed to perform centrifugal dehydration, and a device that detects the vibration amplitude of the drum during low-speed operation. In some cases, the drum is accelerated from a low speed to a high speed when the amplitude exceeding the allowable value is not detected continuously for at least one rotation cycle.

[Problems to be solved by the invention]

However, during the spin-drying operation, the excessive amplitude of the washing drum due to the imbalance of the laundry occurs during low-speed rotation, and also occurs at the first rotation.

Therefore, the prior art described above has a problem that the equilibrium state (hereinafter, referred to as balance) of the laundry cannot be easily obtained, and thus the laundry cannot be smoothly transferred to the dehydration process.

An object of the present invention is to allow the drum-driven dehydration process to smoothly enter even when the laundry in the drum is unbalanced, and thus to perform the entire process from washing to rinsing, dehydration and drying. It is an object of the present invention to provide an improved washing / drying machine which can make a transition smoothly.

[Means for solving the problem]

In order to achieve the above object, a first feature of the present invention is that a drum for storing laundry, an outer tub surrounding the drum and storing washing water, and a drum and an outer tub are elastically held in an outer frame. Device, a motor for rotating the drum, and, during dehydration, when the vibration amplitude of the outer tub exceeds a value set in advance as an allowable value, a vibration detection switch for detecting the vibration amplitude is provided. When the vibration detection switch is operated, the rotation of the drum is temporarily stopped, and then, for a short time, the drum is rotated in the reverse direction from the normal rotation, and then is rotated at a low speed in one direction. Otherwise, in the washing / drying machine that shifts to high-speed rotation, when the vibration detection switch operates to detect that the imbalance of the laundry in the drum is not eliminated by one forward / reverse rotation, Positive drum Is reversely rotated, there energization time to the motor at the time of the normal and reverse rotation, in that a control means for changing relative energization time of it to previous drum forward and reverse rotation time of the motor.

A second feature of the present invention is that in this type of washing and drying machine, when the vibration detection switch operates to detect that the imbalance of the laundry in the drum is not eliminated by one forward / reverse rotation. Then, the control means for rotating the drum forward and backward and changing the rotation speed of the motor at the time of forward and reverse rotation with respect to the rotation speed of the motor at the time of the previous forward and reverse rotation of the drum are provided. is there.

[Action]

According to the present invention having the above-described structure, when the vibration detection switch is operated during dehydration, the rotation of the drum is temporarily stopped, and then, for a short time, the drum is repeatedly rotated forward and reverse. Then, if the vibration detection switch does not operate by rotating at a low speed in one direction, a control means for shifting to a high speed rotation is provided. Even if it is, the imbalance can be positively resolved and the drum-driven dewatering process can be smoothly entered. In particular, according to the first aspect, one time If the vibration detection switch operates to detect that the imbalance of the laundry in the drum is not eliminated by the forward / reverse rotation, the drum is subsequently rotated forward / reversely, and the motor during the forward / reverse rotation is rotated. Control means for changing the energizing time of the motor with respect to the energizing time to the motor at the time of forward and reverse rotation of the drum, thereby changing the behavior of the laundry in the drum and reducing the imbalance of the laundry. According to the second aspect of the present invention, when the vibration detection switch detects that the imbalance of the laundry in the drum is not canceled by one forward / reverse rotation, the drum is subsequently stopped. By rotating the motor forward / reverse and changing the rotation speed of the motor during the forward / reverse rotation with respect to the rotation speed of the motor during the previous forward / reverse rotation of the drum. By changing the behavior of the laundry, the imbalance of the laundry can be eliminated, and the entire process from washing to rinsing, dehydration and drying can be smoothly shifted.

〔Example〕

Hereinafter, the present invention will be described with reference to the drawings.
FIG. 1 is a vertical sectional front view showing an internal structure of a drum type washing and drying machine according to one embodiment of the present invention.

In FIG. 1, 1 is an outer frame, 2 is an outer tank suspended inside the outer frame 1 by a support spring 3 and a hanging rod 4, and 5 is a drum rotatably installed in the outer tank 2. , 6 is the drum 5
, A motor 7 for rotating the drum 5, a drum pulley 8 attached to a rotating shaft 9 of the drum 5, a motor pulley 10 provided on the motor 7, and a motor 11 between the drum pulley 9 and the motor pulley 10. Drive belt,
Reference numeral 12 denotes a plurality of lifters provided on the inner peripheral surface of the drum 5 for stirring the laundry 6, 13 denotes a number of dehydration holes provided on the peripheral surface of the drum 5, and 14 denotes a vibration damper provided on the outer tub 2. A projection for measuring the width, 15 is a amplitude detection switch for detecting the vibration amplitude of the drum 5 and the outer tub 2, 16 is a water injection valve for injecting the washing water into the outer tub 2, and 17 is an injection of the washing water A water injection hose for sending water from the valve 16 to the outer tub 2, a drain valve 18 for discharging the washing water in the outer tub 2, a drain hose 19, and a drain hose 20 provided inside the outer frame 1 for washing, rinsing, It is a control device that controls dehydration, drying, etc.

FIG. 2 is a block diagram of a control circuit of the control device 20 relating to the rotational drive of the drum 5.

2, the same reference numerals as those in FIG. 1 denote the same parts, that is, 7 denotes a motor for rotatingly driving the drum 5, and 15 denotes an amplitude detection switch for detecting the amplitude of the vibration of the drum 5 and the outer tub 2.

Reference numeral 21 denotes an amplitude detection circuit connected to the amplitude detection switch 15 for measuring the amplitude, and 22 denotes a washing which rotates the motor 7 at a low speed for washing and rotates the motor 7 at a high speed for dehydration. A dehydration control device, 23 is an AC power supply, and 24 is a forward rotation and a reverse rotation for several seconds when the laundry 6 in the drum 5 is unbalanced before the motor 7 enters a high-speed dehydration operation, and thereafter. A balance drive control device 25 that performs low-speed rotation to eliminate the imbalance, 25 is a low-speed washing rotation of the motor 7 and a high-speed rotation of spin-drying of the motor 7 by the washing and dehydration control device 22, and a forward / reverse rotation of the motor 7 by the balance drive control device 24 Drum drive switching control device that switches the drive for eliminating imbalance due to rotation and low-speed rotation,
Reference numeral 26 denotes a timer for transmitting a signal of a time required for control to the washing and dehydration control device 22 and the balance drive control device 24, and reference numeral 27 denotes a capacitor for the motor 7.

In the above configuration, the operation of the drum type washer / dryer is as follows.
Washing, rinsing, dehydrating, and drying are performed in this order.

For washing, the laundry 6 is put into the drum 5, the injection valve 16 is opened, and the washing water is poured into the outer tub 2 by about 1/3. At the same time, the detergent is put into the outer tank 2. The drum 5 is rotated at a low speed by operating the washing / dehydrating control device 22 and driving the motor 7 at a low speed. When the drum 5 rotates at a low speed,
The laundry 6 is lifted and dropped by a lifter 12 provided on the inner surface of the drum 5, washing is performed with the action of detergent and washing water, and then rinsing is performed.

For rinsing, the drain valve 18 is opened to drain the washing water after washing from the drain hose to the outside. Then, after the drain valve 18 is closed, the water injection valve 16 is opened, and new rinsing water is injected into the outer tub 2. After the rinsing water is injected, the washing and dewatering control device 22 is operated, the motor 7 is rotated at a low speed in the same manner as the washing, and the drum 5 is rotated at a low speed. Due to the low speed rotation of the drum 5,
The laundry 6 is lifted and lifted by the lifter 12, and is agitated and rinsed. When the rinsing is completed, the drain valve 18 is opened, and the rinse water after rinsing is drained from the drain hose to the outside, and dehydration is performed after rinsing.

In the dehydration, the motor 7 is rotated at a high speed by the operation of the washing and dehydration control device 22, thereby rotating the drum 5 at a high speed. When the drum 5 rotates at a high speed, centrifugal force acts on the laundry 6, water is separated from the laundry 6 sticking to the circumferential surface of the drum 5, and flows out of the dehydration hole 13 of the drum 5 to the outer tub 2. The water that has flowed out of the outer tub 2 is drained outside through a drain valve 18 and a drain hose 19.

Laundry 6 after washing and rinsing and draining
Is usually in a state of being offset in the drum 5, ie, an unbalanced state, as shown in FIG. Therefore, when the drum 5 is suddenly rotated at a high speed to start the dehydration motion, the drum 5 and the outer tub 2 vibrate excessively, the safety switch operates, and the dehydration cannot be continued in many cases.

In such a case, in the present invention, the drum drive for positively canceling the imbalance of the laundry is performed.

Here, the drum drive control for eliminating imbalance in the above embodiment will be described with reference to FIGS. 1 and 2 and based on FIG.

That is, FIG. 3 is a flowchart showing drum drive control at the start of dehydration.

At the start of dehydration, when the laundry 6 is offset in the drum 5 as shown in FIG. 1, that is, in an unbalanced state, when the rotation of the drum 5 suddenly enters the high-speed dehydration rotation, the drum 5 and the outer tub 2 Swings up, down, left and right.

When the amplitude exceeds the allowable value, the projection 14 provided on the upper portion of the outer tub 2 presses the amplitude detection switch 16. When the amplitude detection switch 16 is turned on, the signal is caught by the amplitude detection circuit 21 and input to the balance drive control device 24.
As shown in FIG. 3, when the amplitude detection switch 21 is ON, the balance drive controller 24 first sends a control signal for stopping the rotation of the drum 5 to the drum drive switching controller 25 to stop the motor 7. Let it. Next, a control signal for rotating the drum 5 forward for several seconds and then for reverse rotation for several seconds is transmitted to the drum drive switching control device 25 to rotate the motor 7 forward and reverse. Further, a control signal for rotating the drum 5 at a low speed is transmitted to the drum drive switching control device 25 to cause the motor 7 to rotate at a low speed. On the basis of the signal, the motor 7 is rotated at a high speed to start dehydration. Then, at the time of the high-speed rotation of the dehydration, if the vibration amplitude of the drum 5 and the outer tub 2 is not more than the allowable value and the amplitude detection switch 15 is not ON,
Continue high-speed rotation of dehydration.

On the other hand, if the laundry 6 is still unbalanced, the amplitude exceeds the allowable value, and the amplitude detection switch 15 is ON, the drum drive is stopped again, the normal rotation for several seconds, and the reverse for several seconds. After rotating and rotating at a low speed to eliminate the imbalance of the laundry 6, high-speed rotation for dehydration is started.

FIG. 4 shows the drum drive control for eliminating the imbalance of the laundry 6, that is, the behavior of the laundry 6 in the drum 5.

FIG. 4A shows the state of the laundry 6 after rinsing and draining, and the laundry 6 is offset to the lower left in the drum 5. This offset is at the lower left in (1) above, but it may be offset to the lower right or offset directly below.

(2) shows the state of the laundry 6 when the drum 5 is rotated forward for several seconds, and the right end 6a of the laundry 6 is swung to the right by the drum driving force. Conversely, (3) is a case where the motor is rotated backward for several seconds. In (3), the left end 6b of the laundry 6 is swung to the left, and at this point, the imbalance of the laundry 6 has been eliminated to some extent. At this moment, the case where the drum 5 is rotated forward at a low speed is (4).
In the state (4), the laundry 6 is dispersed almost entirely in the drum 5, and the weight is well balanced. Then, when the laundry 6 is balanced, the drum 5 is rotated at a high speed to enter a spin-drying motion (5).
It is. In the state of (5), the laundry 6 is
Dehydration is performed in the form of sticking to the circumferential surface of.

The time for dehydration is measured from the start of dehydration by the timer 26 shown in FIG.
The signal is transmitted to the washing / dehydrating control device 22. As shown in FIG. 3, if the control by the washing and dehydrating control device 22 is not completed by judging whether the dehydration is completed, the drum is rotated at a high speed again to perform the dehydration. If the signal of the end of dehydration is received by the timer 26 and the judgment of the end of dehydration is YES, the next drying is started.

Drying is performed by a heater for blowing hot air to the drum 5 and a blowing fan, but is not shown in FIG. When drying starts, the drum 5 is rotated at a low speed, and the lifter 12 is rotated.
As a result, the laundry 6 is given a lifting action and a dropping action to be stirred. Then, by blowing hot air heated by a heater to the drum 5 and bringing the hot air into contact with the laundry 6, moisture contained in the laundry moves into the hot air, and the laundry is dried and the moisture is removed. The moist hot air is discharged outside the machine.

That is, in the present embodiment, when the laundry 6 in the drum 5 is unbalanced, before the drum 5 is rotated at a high speed and the spin-drying operation is started, the drum 5 is shaken by the forward rotation and the reverse rotation for a short time. An unbalance of the laundry 6 is positively eliminated by giving a dynamic operation, and an operation of giving a low-speed rotation to distribute the laundry 6 in the drum 5 in a well-balanced manner is added. As a result, even when the laundry 6 in the drum 5 is imbalanced, the drum-driven dehydration process can enter the spin-drying process more smoothly than in the past, and the washing, rinsing, dehydration and drying are performed. The function of the washer / dryer can be completely automated.

This will be described in more detail with reference to FIG. 5. FIG. 5 shows that the energizing time between the forward rotation and the reverse rotation is related to the forward rotation and the reverse rotation control of the drum for several seconds to eliminate the imbalance of the laundry. 6 is a time chart in which is changed.

In FIG. 5, the horizontal axis represents the elapsed time, the vertical axis represents the rotational speed (rpm) of the drum, the upper part represents the forward rotation, and the lower part represents the reverse rotation. Is gradually increased to t ₁ s, t ₂ s, and t ₃ s.

As shown in the flowchart of FIG. 3 described above, when the amplitude detection switch is turned on, the drum drive is stopped, the drum is stopped to rotate normally for t ₁ second, and then the drum is controlled in reverse for t ₁ second. Rotation, further forward rotation at low speed, then enter the high-speed rotation of dehydration, here again judge whether the amplitude detection switch is ON, if it is ON, then t ₂ seconds, that is, more than the t ₁ Rotate forward and reverse for a little longer time t ₂ seconds, then rotate at low speed, and then start spinning at high speed again.

FIG. 5 shows the energization time between the forward rotation and the reverse rotation of the drum.
At ₃ seconds, the imbalance of the laundry was eliminated, and the vibration amplitude of the drum remained below the allowable value even during the dehydration operation after low-speed rotation, and the amplitude detection switch was not turned on. 3 shows an example in which the operation is shifted to a high-speed rotation.

That is, according to the present embodiment, the behavior of the laundry in the drum changes by changing the energization time of the drum forward rotation and the reverse rotation as compared with the case where the energization time is the same, and the laundry Experiments have confirmed that the balance can be eliminated at an early stage.

FIG. 6 shows a second embodiment of the present invention.
6 is a time chart in which rotation speeds of forward rotation and reverse rotation are changed in relation to reverse rotation control.

In FIG. 6, as in FIG. 5, the abscissa indicates the elapsed time, the ordinate indicates the rotation speed (rpm) of the drum, and the upper part indicates forward rotation and the lower part indicates reverse rotation. examples are where the rotational speed of the drum forward rotation is changed from _{a 1, a 2, a 3} , also by changing the rotational speed of the drum rotates inversely _{b 1, b 2, b 3} .

Further, the drum drive control, this also as shown in the flowchart of Figure 3 discussed previously, if ON is Fuhaba detection switch, to stop the drum rotation, t ₁ seconds at a rotational speed a ₁ normal rotation Then, reverse rotation for t ₁ second at the rotation speed b ₁ and further forward rotation at low speed, then enter the high-speed rotation of dehydration, here judge whether the amplitude detection switch is ON again, if it is ON,
Next, forward rotation is performed at a rotation speed a ₂ , subsequent reverse rotation is performed at a rotation speed b ₂ , and after the drum is rotated at a low speed in the forward direction, the dehydration starts at a high speed again.

Incidentally, FIG. 6 is a rotational speed of the drum forward rotation and a _3, to eliminate the imbalance of the laundry when the rotary speed of the drum reverse rotation was b _3, the drum even when the dehydration operation after the low-speed rotation followed by This shows an example in which the vibration amplitude was maintained below the allowable value, and the amplitude detection switch was not turned ON, so that the operation was shifted to high-speed rotation of dehydration.

That is, according to the present embodiment, by changing the rotation speed of the drum forward rotation and the reverse rotation, the laundry in the drum is similar to the embodiment of FIG. It was confirmed by experiments that the behavior of the laundry changed, and that the imbalance of the laundry could be eliminated at an early stage.

7 and 8 show an application example, and FIG. 7 shows a detection switch for detecting the vibration amplitude of the drum and the outer tub.
It is a cross-sectional plan view showing an example in which two such switches are provided, one for left-right direction detection and one for front-rear direction detection.

In FIG. 7, 1 is an outer frame, 2 is an outer tank containing a drum, 28 (28a, 28b) is a frame fixed to the outer tank 2, 29 (2
9a to 29d) are hanging brackets provided at the four corners of the frame 28, 30 (30a to 30d) is a support spring for elastically suspending the outer tub and the frame 28, and 31 (31a to 31d) are support springs, respectively. Hanging rods connected to 30 and 32 (32a to 32d) are corner fittings fixed to the four corners of the outer frame 1 for hooking the hanging rods 31, respectively.

Reference numeral 33 denotes an amplitude detection switch (A) which is fixed to the right side of the outer frame 1 and detects the vibration amplitude of the outer tub 1 in the left-right direction.
The switch (A) 33 corresponds to the switch 15 in FIG. Reference numeral 34 denotes an amplitude detection switch (B) fixed to the rear surface of the outer frame 1 for detecting the vibration amplitude of the outer tub 1 in the front-rear direction. Reference numeral 35 denotes a detection switch (A) 33 fixed to the frame 28a. Switch for pushing, 36 is frame
It is a switch projection fixed to 28b and for pressing the detection switch (B) 34.

37 is a loading ring for loading and unloading laundry fixed to the front of the outer frame 1, 38 is a bellows for sealing between the loading ring 37 and the outer tub 1, 39 is an openable / closable door attached to the front of the outer frame 1. It is.

FIG. 8 is a block diagram of a control circuit related to the drum drive control of FIG.

In FIG. 8, reference numerals 7 to 27 correspond to FIG. That is, 7 is a motor for rotating the drum, 22 is a washing and dehydrating control device for rotating the motor 7 at a low speed for washing and for rotating the motor 7 at a high speed for spinning,
Reference numeral 23 denotes an AC power supply, and 24 denotes a case where the imbalance occurs in the laundry in the drum before the motor 7 enters a high-speed dehydrating operation, and performs forward rotation and reverse rotation for several seconds, followed by low-speed rotation. A balance drive control device 25 for eliminating imbalance is provided with a washing low-speed rotation of the motor 7 and a high-speed rotation of spin-drying by the washing and dehydration control device 22 and an unbalance by forward and reverse rotation and low-speed rotation of the motor 7 by the balance drive control device 24. A drum drive switching controller for switching the drive for eliminating the balance; 26, a timer for transmitting a signal of a time required for control to the washing / dehydrating controller 22 and the balance drive controller 24; 27, a capacitor for the motor 7; It is.

Reference numeral 33 denotes a detection switch (A) corresponding to FIG. 7, and reference numeral 34 denotes a detection switch (B).

Reference numeral 40 denotes an amplitude detection circuit for detecting the amplitudes of the detection switch (A) 33 and the detection switch (B) 34 together.

In the above configuration, the vibration during the dehydration operation of the outer tub indicated by reference numeral 2 in FIG. If the right and left deflection is excessive, the outer frame 28
Detection switch (A) 3
Press 3 to turn it on. Further, when the vibration in the front-rear direction is excessive, the detection switch (B) 34 is pressed by the switch projection 36 fixed to the outer frame 28b to be turned ON. Therefore,
When either the amplitude detection switch (A) 33 or the amplitude detection switch (B) 34 is turned on, the amplitude detection circuit 40 shown in FIG. 8 detects this and sends the signal to the balance drive controller 24. Send The balance drive control device 24 includes an amplitude detection switch (A) 33 or an amplitude detection switch (B)
If any of 34 is ON, stop the rotation of the drum and then rotate the drum forward for a few seconds, as shown in FIG.
Subsequently, reverse rotation is performed for a few seconds to eliminate the imbalance of the laundry in the drum. After that, the drum is rotated at a low speed, and the laundry is dispersed and balanced throughout the drum. Thereafter, the laundry is again rotated at a high speed.

That is, according to this application example, excessive vibration of the outer tub 1 and the drum due to imbalance of the laundry is detected by detecting not only the horizontal vibration amplitude but also the front-back vibration amplitude. The imbalance can be more accurately detected, whereby the unbalance cancellation control of the laundry and the operation of shifting the drum to the dehydration process can be performed more reliably.

9 and 10 show another application example, and FIG. 9 is a vertical sectional front view of a drum type washing and drying machine showing an example in which the vibration amplitude of the drum and the outer tub is detected by an acceleration sensor.

In FIG. 9, reference numerals 1 to 20 correspond to FIG. That is, 1 is an outer frame, 2 is an outer tub suspended inside the outer frame 1 by a support spring 3 and a hanging rod 4, and 5 is an outer tub 2
A drum rotatably installed in the drum; 6, laundry loaded into the drum 5; 7, a motor for rotating the drum 5; 8, a drum pulley attached to a rotating shaft 9 of the drum 5; , A driving belt laid between the drum pulley 8 and the motor pulley 10;
Is a lifter provided on the inner peripheral surface of the drum 5 for stirring the laundry 6; 13 is a large number of dehydration holes provided on the peripheral surface of the drum 5; 14 is a vibration amplitude provided on the outer tub 2 Protrusion for measurement,
Reference numeral 15 denotes an amplitude detection switch for detecting the vibration amplitude of the drum 5 and the outer tub 2, 16 denotes a water injection valve for injecting washing water into the outer tub 2, and 17 denotes washing water from the water injection valve 16 to the outer tub 2 A drain valve for discharging the washing water in the outer tub 2, a drain hose 19, and a drain hose 20 provided inside the outer frame 1,
It is a control device for controlling washing, rinsing, dehydration, drying, and the like.

Reference numeral 41 denotes an acceleration sensor fixed to the outer tub 2, and reference numeral 42 denotes a sensor wiring for transmitting a signal of the acceleration sensor 41 to the control device 20.

FIG. 10 is a block diagram of a drum drive control circuit using the acceleration sensor 41 of FIG.

In FIG. 10, reference numerals 7 to 27 correspond to FIG. 2 and FIG. That is, 7 is a motor for rotating the drum, 22 is a washing and dehydrating control device for rotating the motor 7 at a low speed for washing and rotating the motor 7 for high speed for washing, 23 is an AC power supply, and 24 is a motor for rotating the motor 7. If the laundry in the drum is unbalanced before entering the high-speed dehydration operation, a balance drive control device that performs forward rotation and reverse rotation for several seconds, and then performs low-speed rotation to eliminate the imbalance, 25 Is the washing and dewatering control device 22
A drum drive switching control device for switching between low-speed rotation of the motor 7 for washing and high-speed rotation for spin-drying, and normal / reverse rotation of the motor 7 and drive for eliminating imbalance due to low-speed rotation by the balance drive control device 24; A timer 27 for transmitting a signal of a time required for control to the control device 22 and the balance drive control device 24, and a capacitor 27 for the motor 7.

41 is an acceleration sensor, and 43 is an acceleration measuring circuit for measuring an acceleration signal from the acceleration sensor 41.

Here, the operation of the application example shown in FIGS. 9 and 10 will be described. In FIG. 9, when the drum 5 is rotated at a high speed to start the dehydration operation, the vibration acceleration of the drum 5 and the outer tub 2 is increased. When the acceleration is measured by the sensor 41 and becomes equal to or more than the allowable value, the balance control device shown in FIG.
At 24, as shown in FIG. 3, the rotation of the drum 5 is stopped, then the drum 5 is rotated forward for several seconds, and then reversely rotated for several seconds, so that the imbalance of the laundry 6 in the drum 5 is reached. To eliminate. After that, the drum 5 is rotated at a low speed, and the laundry 6 is dispersed and balanced in the whole of the drum 5, and then the high speed rotation of the dehydration is started again.

That is, in this application example, as a means for detecting the vibration amplitude of the drum 5 and the outer tub 2, an acceleration sensor 41 is used instead of the amplitude detection switches 33 and 34 shown in FIGS. I have.

The advantages of using the acceleration sensor 41 as means for detecting the vibration amplitude of the drum 5 and the outer tub 2 are as follows.

That is, when the switches 33 and 34 shown in FIGS. 7 and 8 are used as the amplitude detection switches, the switches 33 and 34 fixed to the outer frame 1 respectively control the vibration of the outer tub 2 in the left-right direction and Since it is necessary to detect the vibration in the front-rear direction, the installation position is limited.
According to the application example of FIG. 10, the acceleration sensor 41 for measuring the vibration acceleration of the outer tub 20 and the drum 5 may be installed in a part of the outer tub 2 itself, and the installation position of the acceleration sensor 41 can be easily selected. is there. Further, according to this application example, the vibration amplitude of the outer tub 2 and the drum 5 can be measured by acceleration, and acceleration data in the middle until the vibration amplitude becomes excessive can be obtained. The data can be used effectively when it is needed.

FIGS. 11 to 13 show still another application example. FIG. 11 shows a drum drive control having a circuit for detecting whether or not the imbalance of laundry has been eliminated by an input current value of a drum drive motor. It is a block diagram of a circuit.

In FIG. 11, reference numerals 7 to 27 correspond to FIGS.
This corresponds to FIG. 10 and FIG. That is, 7 is a motor for rotating the drum, 22 is a washing and dehydrating control device for rotating the motor 7 at a low speed for washing and rotating the motor 7 for high speed for washing, 23 is an AC power supply, and 24 is a motor for rotating the motor 7. Before entering the high-speed dehydration operation, if the laundry in the drum is unbalanced, a forward rotation and a reverse rotation for several seconds, and a balance drive control device that performs the subsequent low-speed rotation to eliminate the imbalance, A drum drive 25 switches between low-speed washing and high-speed spinning of the motor 7 by the washing and dehydrating control device 22 and high-speed rotation of spinning of the motor 7 by the balance driving control device 24 to eliminate imbalance due to forward and reverse rotation and low-speed rotation of the motor 7. Switching control device,
Reference numeral 26 denotes a timer for transmitting a signal of a time required for control to the washing and dehydration control device 22 and the balance drive control device 24, and reference numeral 27 denotes a capacitor for the motor 7.

A motor current measurement circuit 44 is connected to the drum drive switching control device 25 to measure the current value of the motor 7. The motor current measurement circuit 44 is also connected to the balance drive control device 24 to which the current value data is transmitted.

FIG. 12 is a characteristic diagram showing a relationship between a motor load, a rotation speed, and a torque.

In FIG. 12, Tm is the generated torque with respect to the rotation speed of the motor, Ts has a large imbalance in the laundry, and therefore, the load characteristic when the load is large, and T _A is when the imbalance of the laundry is slightly small. load characteristics when the load characteristics, T _B is which laundry and imbalance is completely eliminated drum rotation is performed normally, Im represents the input current value with respect to the rotational speed of the motor.

As shown in FIG. 12, when the unbalance of laundry is large, the rotational speed of the motor rises to the rotation of the intersection S ₁ between the Ts and Tm, thereafter, the rotation of the motor is thereby stopped. Then, the motor current value at the S ₁ is Is shown by the _two-dot S.
Also, if the imbalance of the laundry is slightly smaller,
Rotational speed of the motor is at the intersection a ₁ between T _A and Tm, the motor current value at that time is I _A indicated by a _two-dot a, thereafter, the motor,
It rotates stably at that speed. Furthermore, if the imbalance of the laundry becomes completely drained, light load, the rotation speed of the motor, at the intersection b ₁ between T _B and Tm, the motor current value at that time, I _B shown by b ₂ Thereafter, the motor stably rotates at the rotation speed.

Thus, there is no imbalance in the laundry, lighter motor input current I _B of the load is smaller than the current value in the case of a large load with unbalanced laundry, in the FIG. 12 Is
> I _A > I _B , and the characteristics described above exist between the load of the motor and the input current.

Here, drum drive control for eliminating imbalance in this application example will be described based on FIG. 13 with reference to FIGS. 11 and 12.

That is, FIG. 13 is a control flowchart of the drum drive in this application example, and the respective steps of selection, rinsing, and drying are the same as those in FIG.

In FIG. 13, when the drum is rotated at a high speed to start the spin-drying operation and the vibration of the outer tub and the drum becomes excessive due to the imbalance of the laundry, the amplitude detecting switch 15 is turned on. And the balance drive control device 24
Stops the drum, then rotates the drum forward for a few seconds,
Subsequently, reverse rotation is performed for a few seconds to eliminate the imbalance of the laundry in the drum. Then, the drum is rotated at a low speed, and the laundry is dispersed and balanced over the entire drum. Thereafter, the input current value of the motor 7 is measured by the motor current measurement circuit 44, and the current value of the motor becomes the twelfth. In the figure
If it is equal to or smaller than T _A (this is the allowable current value), it is determined that the imbalance of the laundry has been eliminated, and the drum is again shifted to the high-speed rotation for spinning.

On the other hand, if the current value of the motor is larger than the allowable value T _A, it is determined that the imbalance of the laundry is still large, and the drum is stopped, and the correctness of the drum is corrected to cancel the imbalance again. Perform rotation, reverse rotation and low-speed rotation. And the drum drive to eliminate imbalance,
Repeated until the current value of the motor becomes equal to or less than the allowable value I _A.

That is, according to this application example, by adding a circuit that detects whether the imbalance of the laundry has been eliminated based on the input current value of the drum driving motor 7 which is a direct driving source of the drum, The moment when the imbalance of the laundry is eliminated can be detected in a timely and accurate manner, and the operation of rotating the drum at a high speed and shifting to the spin-drying operation can be performed more reliably.

〔The invention's effect〕

According to the present invention, upon dehydration, when the vibration detection switch is activated, the rotation of the drum is temporarily stopped,
For a short time, the drum is repeatedly rotated forward and backward, and subsequently rotated at a low speed in one direction, and if the vibration detection switch is not operated, by providing control means for shifting to a high speed rotation, Even if the laundry in the drum is unbalanced at the beginning of the spin-drying operation, the unbalance can be positively eliminated and the drum-driven spin-drying process can be smoothly started. In particular, according to the first aspect, when the vibration detection switch detects that the unbalance of the laundry in the drum is not canceled by one forward / reverse rotation, the drum is subsequently moved forward. By providing control means for rotating the motor in the reverse direction and changing the energizing time to the motor at the time of the forward / reverse rotation with respect to the energizing time to the motor such as the drum forward / reverse rotation before that,
By changing the behavior of the laundry in the drum, the imbalance of the laundry is eliminated, and according to the second invention, the unbalance of the laundry in the drum is not eliminated by one forward / reverse rotation. When the vibration detection switch is activated and detected, the drum is rotated forward and backward, and the rotation speed of the motor at the time of forward and reverse rotation is changed to the previous forward and backward rotation of the drum.
By providing control means for changing the rotation speed of the motor during reverse rotation, the behavior of the laundry in the drum is changed to eliminate the imbalance of the laundry, and from washing to rinsing, dehydration and drying The entire process can be shifted smoothly.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional front view showing the internal structure of a drum type washer / dryer according to the present invention. FIG. FIG. 3 is a block diagram of a control circuit for explaining the rotational drive of the drum 5 in relation to the control device shown in FIG. 3, FIG. 3 is a flowchart showing drum drive control at the start of spin-drying, and FIG. FIG. 5 is a diagram showing the drum drive control, that is, the behavior of the laundry 6 in the drum 5; FIG. 5 is a diagram showing the normal rotation and the reverse rotation of the drum for several seconds to cancel the imbalance of the laundry; FIG. 6 shows a second embodiment of the present invention, in which the energizing time for rotation is changed, and FIG. Time chart in which the rotation speed of forward rotation and reverse rotation is changed FIG. 7 and FIG. 8 show an application example. FIG. 7 shows two detection switches for detecting the vibration amplitude of the drum and the outer tub, one for the left-right direction detection and the other for the front-rear direction detection. FIG. 8 is a block diagram of a control circuit related to the drum drive control of FIG. 7, FIG. 9 and FIG. 10 show other applied examples, and FIG. FIG. 10 is a vertical sectional front view of a drum type washer / dryer showing an example of detecting the vibration amplitude of the drum with an acceleration sensor, FIG. 10 is a block diagram of a drum drive control circuit using the acceleration sensor 41 of FIG. 9, and FIGS. FIG. 13 shows still another application example, and FIG. 11 is a block diagram of a drum drive control circuit to which a circuit for detecting whether the imbalance of the laundry has been eliminated based on the input current value of the drum drive motor is added. Fig. 12 shows the relationship between motor load, rotation speed, and torque. Be characteristic diagram, Fig. 13 is a control flowchart of the drum drive in this application. 1 ... outer frame, 2 ... outer tub, 3 ... support spring, 4 ... hanging rod, 5 ... drum, 6 ... laundry, 7 ... motor, 14 ...
... switch projection, 15 ... amplitude detection switch, 20 ... control device, 21 ... amplitude detection circuit, 22 ... washing and dehydration control device, 23 ... AC power supply, 24 ... balance drive control device, twenty five
...... Drum drive switching control device, 28 (28a, 28b) ...... Frame, 29 (29a to 29d) ...... Hanging bracket, 30 (30a to 30d) ...
... Support spring, 31 (31a-31d) ... Hanging rod, 32 (32a-32)
d)… Corner fitting, 33… Amplitude detection switch (A), 34…
... Amplitude detection switch (B), 35 ... Switch projection, 36
… Projection for switch, 40… Amplitude detection circuit, 41… Acceleration sensor, 42… Sensor wiring, 43… Acceleration measurement circuit,
44 …… Motor current measurement circuit.

Continuation of front page (56) References JP-A-57-49495 (JP, A) JP-A-57-78894 (JP, A) JP-A-1-230391 (JP, A) JP-A-1-40094 (JP) , A) JP-B-63-35269 (JP, B2) JP-B-58-20235 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06F 1/00-51/02

Claims (2)

(57) [Claims] 1. A drum for storing laundry, an outer tub surrounding the drum and storing washing water, a device for elastically holding the drum and the outer tub in an outer frame, a motor for rotating and driving the drum, When the vibration amplitude of the outer tub exceeds a value set in advance as a permissible value during dehydration, a vibration detection switch is provided for detecting the vibration amplitude. The rotation is temporarily stopped, and then, for a short time, the drum is rotated in the reverse direction to the normal rotation, and then the drum is rotated at a low speed in one direction. If the vibration detection switch is not operated, the laundry is dried and dried. If the vibration detection switch detects that the imbalance of the laundry in the drum is not canceled by one forward / reverse rotation, the drum is rotated forward / reversely. When rotating in reverse A washing / drying machine comprising control means for changing the energizing time to the motor during the rotation of the motor with respect to the energizing time to the motor at the time of the previous forward / reverse rotation of the drum. 2. A drum for storing laundry, an outer tub surrounding the drum and storing washing water, a device for elastically holding the drum and the outer tub in an outer frame, a motor for rotating and driving the drum, When the vibration amplitude of the outer tub exceeds a value set in advance as a permissible value during dehydration, a vibration detection switch is provided for detecting the vibration amplitude. The rotation is temporarily stopped, and then, for a short time, the drum is rotated in the normal direction and the reverse direction, and then the drum is rotated at a low speed in one direction. If the vibration detection switch detects that the imbalance of the laundry in the drum is not canceled by one forward / reverse rotation, the drum is rotated forward / reversely. When rotating in reverse A washing / drying machine provided with control means for changing the rotation speed of the motor during rotation of the motor relative to the rotation speed of the motor at the time of the previous forward / reverse rotation of the drum.