JP3497645B2 - Washing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine equipped with a rotary tub rotated during a dehydration operation and a brake device for braking the rotary tub after the dehydration operation is completed.

[0002]

Conventionally, in a washing machine for combined use of spin-drying, when the spin-tub driving motor is turned off, a certain time elapses after the spin-drying operation is completed. Therefore, the brake device is operated, so that the rotation tank in the inertia rotation state is braked and stopped early.

By the way, the stress applied to the brake device during braking of the rotary tank depends on the magnitude of the inertial force of the rotary system to be braked. Specifically, the stress applied to the brake device increases as the rotating tank speed at the start of braking increases, and when the inertial weight of the rotating tank is large,
That is, it becomes large when the amount of laundry stored in the rotary tub is large, or when the laundry has a high water content (for example, thick cotton such as denim).

For this reason, in the conventional structure in which the brake device is always operated at the same timing, the stress applied to the brake device varies depending on the amount of laundry stored in the rotary tub and the quality of the cloth. In particular, when the amount of laundry is large or the quality of the laundry is high in water content, the stress applied to the brake device becomes large, and the reliability of the life of the brake device is increased. There is also a problem that the operating noise of the brake device becomes louder as the operating noise becomes lower. Further, in order to deal with such a problem, when the timing of operating the brake device is delayed, it is not necessary to consider the magnitude of the stress applied to the brake device, that is, the inertial weight of the rotary tank is small. In the state, there is a problem that the time until the rotation tank is stopped after the dehydration operation is unnecessarily prolonged.

Further, it is unavoidable that the rotary tank vibrates during the dehydration operation, but in the conventional configuration, the time until the brake device operates after the motor is cut off is set to be constant. In addition, the state in which the rotary tank is inertially rotated while the amplitude of the rotary tank is large is always continued for a certain time. For this reason, there is a problem that components such as drainage hoses and lead wires provided around the rotary tank are subject to a large amount of stress for a long period of time, leading to a decrease in the reliability of the life of those peripheral components. .

The present invention has been made in view of the above circumstances, and a first object of the present invention is to prevent an unnecessarily long time until the rotation tank is braked after the dehydration operation is completed. The purpose of the present invention is to provide a washing machine capable of improving the reliability of the life of a brake device for stopping the rotation of a rotary tub. A second object is to apply a large stress to peripheral parts when the brake of the rotary tub is stopped. It is an object of the present invention to provide a washing machine capable of preventing such a situation and improving the reliability of the life of those peripheral parts.

[0007]

The invention according to claim 1 is
A rotating tub rotated by a motor during the dehydration operation, a laundry amount detecting means for detecting the weight of the laundry stored in the rotating tub, and a rotation speed detecting means for detecting the rotation speed of the rotating tub during the dehydration operation. A braking device for braking the rotary tub, and a motor for disconnecting the motor when the dehydration operation is finished, and a braking start rotational speed in which a rotational speed detected by the rotational speed detecting means is preset after the electric power is cut off. And a control means for operating the brake device when the weight decreases, the control means changes the braking start rotation speed to a lower value as the weight detected by the laundry amount detection means increases. It was done.

According to this structure, when the dehydration operation is completed, the motor is turned off by the control means to rotate the rotary tank by inertia, and the rotation speed thereof gradually decreases. The rotation speed detection means detects the rotation speed of the rotary tank as described above, and the control means operates the brake device when the detected rotation speed decreases to a preset braking start rotation speed. The rotation tank will be braked and stopped.

At this time, the control means performs control to change the braking start rotation speed to a lower value as the weight of the laundry detected by the laundry amount detection means is larger, that is, as the inertial weight of the rotary tub is larger. Like Therefore, when the inertial weight of the rotary tank is large, the brake device is not operated from the time when the rotational speed of the rotary tank is relatively high. For this reason, the stress applied to the brake device does not become extremely large, and the reliability of the life of the brake device is improved. Further, when the inertial weight of the rotary tank is relatively small, that is, when it is not necessary to consider the magnitude of the stress applied to the brake device, the brake device is operated from the time when the rotational speed of the rotary tank is relatively high, There is no possibility that the time until braking of the rotary tank is stopped after the dehydration operation is unnecessarily prolonged.

According to a second aspect of the present invention, a rotating tub rotated by a motor during a dehydration operation, a cloth quality detecting means for detecting the cloth quality of the laundry stored in the rotating tub, and the rotation during the dehydration operation. Rotation speed detection means for detecting the rotation speed of the tank, a brake device for braking the rotation tank, and the motor is cut off when the dehydration operation is completed, and by the rotation speed detection means after the cutoff. And a control means for operating the brake device when the detected rotation speed is reduced to a preset braking start rotation speed,
The control means is characterized in that the braking start rotation speed is changed to a lower value as the cloth quality detected by the cloth quality detecting means is higher in water content.

With such a construction as well, when the dehydration operation is completed, the motor is cut off by the control means to rotate the rotary tank by inertia, and the rotational speed thereof is gradually reduced. The rotation speed detection means detects the rotation speed of the rotary tank as described above, and the control means operates the brake device when the detected rotation speed decreases to a preset braking start rotation speed. The rotation tank will be braked and stopped.

At this time, the control means changes the braking start rotation speed to a lower value as the cloth quality detected by the cloth quality detection means is higher in water content, that is, as the inertial weight of the rotary tank is larger. To control. Therefore, when the inertial weight of the rotary tank is large, the brake device is not operated from the time when the rotational speed of the rotary tank is relatively high. For this reason, the stress applied to the brake device does not become extremely large, and the reliability of the life of the brake device is improved. Further, when the inertial weight of the rotary tank is relatively small, that is, when it is not necessary to consider the magnitude of the stress applied to the brake device, the brake device is operated from the time when the rotational speed of the rotary tank is relatively high, There is no possibility that the time until braking of the rotary tank is stopped after the dehydration operation is unnecessarily prolonged.

According to a third aspect of the present invention, a rotating tub rotated by a motor during the dehydration operation, an amplitude detecting means for detecting an amplitude of the rotating tub in a rotated state, and a rotation of the rotating tub during the dehydration operation. Rotational speed detection means for detecting the speed, a brake device for braking the rotary tub, and the motor when the spin-drying operation is finished, and the rotational speed detection means detects the rotational speed after the power is cut off. Is provided with a control means for operating the brake device when the braking start rotation speed is set to a preset value,
The control means is characterized in that the braking start rotation speed is changed to a higher value as the amplitude detected by the amplitude detection means is larger.

With such a construction as well, when the dehydration operation is completed, the motor is cut off by the control means to rotate the rotary tank by inertia, and the rotation speed thereof gradually decreases. The rotation speed detection means detects the rotation speed of the rotary tank as described above, and the control means operates the brake device when the detected rotation speed decreases to a preset braking start rotation speed. The rotation tank will be braked and stopped.

At this time, the amplitude detecting means detects the amplitude in the state where the rotary tank is rotated, and the control means increases the braking start rotational speed as the amplitude detected by the amplitude detecting means increases. Control to change to a value.
Therefore, when the amplitude of the rotary tank is large, the braking operation by the brake device is started at a relatively early timing, and therefore the state in which the rotary tank is inertially rotated while the amplitude of the rotary tank is large is inconvenient. It will not be continued for a long time. As a result, it is possible to shorten the time during which large stress is applied to parts such as drainage hoses and lead wires provided around the rotary tank, and it is possible to improve the reliability of the life of those peripheral parts.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. In FIG. 4, which shows a vertical cross-sectional structure of a washing machine, an outer tub 2 is swingably disposed in an outer box 1 via an elastic suspension mechanism 3. In the outer tub 2, a rotary tub 4 serving both as a washing tub and a dehydrating tub
Is rotatably provided, and an agitator 5 is rotatably provided at the inner bottom portion of the rotary tank 4.

The rotary tank 4 is formed in a tapered shape in which the peripheral wall portion gradually expands upward. In the rotary tank 4, the dehydration holes 4a are formed only on the uppermost part of the peripheral wall portion, and the other portions of the peripheral wall portion are formed in a non-hole shape. A group of water passage holes 4b is formed at the bottom of the rotary tank 4.

At the inner bottom of the outer tub 2, there is provided a drainage passage 6 extending rearward from the water passage 4b group of the rotary tub 4. Further, in the outer tub 2, a rear end portion of the drainage passage 6 serves as a drainage port 7, and the drainage port 7 is provided with an air trap 8 for detecting a water level. The drainage port 7 is
For example, it is configured to be opened and closed by a motor type drain valve 9, and a drain hose 10 communicating with the outside of the machine is connected to the lower portion of the drain valve 9.

In the case of this construction, when the drain valve 9 is opened, the water in the rotary tank 4 is drained to the outside through the drain passage 6 and the drain hose 10. Also,
An auxiliary drainage port 11 is formed in the front part of the bottom of the outer tub 2, and the auxiliary drainage port 11 is connected to the drainage hose 10 via a connecting hose (not shown). As a result, when the water in the rotary tank 4 is discharged into the outer tank 2 through the dehydration hole 4a during the dehydration operation, this drainage flows to the outside through the auxiliary drainage port 11, the connection hose and the drainage hose 10. It will be discharged. A water level sensor (indicated by reference numeral 12 in FIG. 5) including a pressure sensor is connected to the air trap 8 via an air pipe 13, and the water level sensor 1
2 is configured to be able to detect the water level in the rotary tank 4.

A balance ring 14 is provided on the upper part of the rotary tank 4.
Is attached. In addition, in the inner peripheral portion of the rotary tank 4,
Inner basket 1 made of stainless steel plate that is almost drum-shaped
5 are provided, and a large number of water passage holes (not shown) are formed in the peripheral wall portion of the inner basket 15.

Further, in the lower part of the inner peripheral portion of the rotary tank 4,
A bottom cover 16 is provided. The inner basket 15
A predetermined gap for water passage is provided between the rotary tank 4 and the rotary tank 4, and between the bottom cover 16 and the rotary tank 4. With such a configuration, the inside of the rotary tank 4 is drained or drained. Water flows downward or upward through the predetermined gap for water passage.

At the outer bottom of the outer tub 2, a motor 17 capable of variable speed driving and a drive mechanism portion 18 are arranged. The rotational force of the motor 17 is transmitted to the drive mechanism section 18 via the belt transmission mechanism 19. Although not specifically shown, the drive mechanism section 18 includes a clutch mechanism,
It has a well-known configuration including a speed reducer, a brake device, and the like. In particular, the clutch mechanism has a function of switching between a state in which the rotational force of the motor 17 is decelerated and transmitted to only the stirring body 5 via the reduction gear during washing, and a state in which it is transmitted at high speed to the rotating tank 4 and the stirring body 5 during dehydration. Have Further, the brake device is provided for selectively braking and releasing the brake of the rotary tub 4 during washing and dehydration, and a brake provided on the tub shaft of the rotary tub 4 so as to rotate integrally therewith. It is composed of a drum and a brake band 18a provided around the brake drum.

A top cover 20 is attached to the upper part of the outer box 1, and a rear part of the top cover 20 has a
Electromagnetic water supply valve 2 for performing water supply operation into the rotary tank 4
1 is provided. Further, the top cover 20 is provided with, for example, a half-foldable lid 22 that can be opened and closed so as to open and close the entrance of the laundry. A tank cover 23 is attached to the upper part of the outer tank 2.
3, an inner lid 24 is provided so as to be openable and closable. This inner lid 2
4, a concave portion 24a having a large number of water passage holes (not shown) is formed on the rear side thereof, and the water from the water supply valve 21 passes through the concave portion 24a and enters the tank. It is configured to be supplied to.

On the other hand, FIG. 5 shows an outline of the electrical configuration by combining functional blocks. In FIG. 5, a control circuit 25 (corresponding to the laundry amount detecting means and the controlling means in the present invention) is composed of a microcomputer and the like, and a washing operation including washing operation, laundry amount determination, drainage / dehydration operation and the like. Has the function of controlling the whole
The control program for that is stored.

The control circuit 25 has various key switches such as a power switch provided on an operation panel (not shown), a start switch, and a reservation switch for setting a reservation operation by a reservation timer function. 26 receives various switch signals, a water level detection signal from the water level sensor 12, and a pulse signal from a rotation sensor 27 (corresponding to the rotation speed detection means in the present invention) that generates a pulse signal in response to the rotation of the motor 17. It is configured.

In this case, the control circuit 25 controls the rotation sensor 2
7 has a function of detecting the rotation speed of the motor 17 based on the pulse signal from the motor 7. In particular, the rotation speed of the stirring body 5 and the rotation tank 4 is detected from the rotation speed of the motor 17 at the time of washing and dehydration. Has become.

Further, the control circuit 25 includes a display unit 28 having various indicators such as a water level indicator provided on the operation panel (not shown), a buzzer 29 for notifying the end of operation, a water supply valve. 21, the drain valve 9, and the motor 17 are configured to be energized and controlled via the drive circuit 30.

When the control circuit 25 is started, for example, on the "standard" course, it is supplied with water, washed, drained, dehydrated (intermediate dehydration), supplied with water, first rinse (trial rinse), drained, dehydrated (intermediate dehydration). ), Water supply, second rinsing (trial rinsing), drainage, dehydration (final dehydration), and in each step of washing and rinsing, the agitator 5 is rotationally driven to rotate the inside of the rotary tank 4. It is designed to stir the washing water and laundry. Further, in the dehydration process, the rotating tank 4 is rotated at a constant rotation speed to perform the dehydration operation.

The flow chart of FIG. 1 shows the part of the control content of the control circuit 25 which is relevant to the gist of the present invention. This will be described below together with the related operation. That is, FIG. 1 shows an example of control in a state in which a so-called silent operation course is not selected. In FIG. 1, when the start switch is turned on while the power is on, first, the operation is performed in the rotary tank 4. The weight detection step A1 for detecting the weight of the laundry being performed is executed.

In this detection step A1, the stirring body 5 is rotated in a predetermined pattern before water is supplied into the rotary tank 4, and the rotation speed of the stirring body 5 at that time, that is, the rotation speed of the motor 17 is measured. The weight of the laundry is detected based on the size of the measurement speed, and the washing operation water level suitable for the detected weight is calculated in a predetermined manner or by using a pre-stored data table. , "Low",
Set to "Small"). However, the weight detection method is not limited to this, and a method of measuring the load current of the motor 17 or the like may be used, or an appropriate amount of water may be supplied.

After this, in the state in which a proper amount of water is supplied through the water supply valve 21 into the rotary tank 4, the cloth quality detecting step A2
To execute. In this detection step A2, for example, the motor 17 is intermittently energized a predetermined number of times for a predetermined number of times with the laundry and an appropriate amount of water stored in the rotary tub 4,
The number of rotations of the stirring body 5 (the number of rotations of the motor 17) at each energization is measured, the absolute value of the difference between the previous measurement number and the current measurement number is taken, and the cloth quality is determined based on the cumulative value of the absolute values. Is determined in, for example, three stages (“flexible”, “standard”, and “stiff”). In addition, "suppleness" corresponds to a soft, low water content cloth like thin synthetic fibers,
"Rigid" corresponds to a cloth material that is hard and highly hydrated, such as thick cotton.

After the cloth quality detecting step A2 is executed,
The cloth quality detection step A2 and the weight detection step A
Step A3 for setting the braking start rotation speed Vs based on the detection result of 1 is executed. This braking start rotation speed Vs is the rotation tank 4 that is inertially rotated after the dehydration operation is completed.
Is for determining the number of revolutions when braking is started by the brake device including the brake band 18a, and is set based on, for example, a table previously stored in FIG.

In FIG. 3, the laundry weight is set to the washing operation water level ("high", "medium",
"Low", "Small"), and as is clear from FIG. 3, the braking start rotation speed Vs is lower as the laundry weight is larger, and the cloth quality of the laundry is higher in water content. It is selected so that the lower it is, the lower it is. However, the braking start rotational speed Vs is the stress applied to the brake band 18a of the braking device when the braking is performed from the state where the rotary tub 4 storing the corresponding laundry is inertially rotated. Is set to a value that fits within the elastic deformation region of the brake band 18a.

After the braking start rotational speed Vs is set as described above, step A4 of supplying water into the rotary tank 4 through the water supply valve 21 in a full scale is executed. In this step A4, as described above, Water is supplied up to the set water level determined according to the detected weight. After this water supply operation is completed, the “washing” step A5 for performing the washing operation for the set time by the stirring body 5, the “drainage” step A6 for draining from the rotary tank 4, and the rotary tank 4 are set. "Dehydration" step A7 for performing a dehydration operation by rotating for a period of time
Are sequentially executed.

When the "dehydration" step A7 is completed, that is, when the set dehydration operation time has elapsed, the motor 17 is de-energized and the operation of detecting the rotation speed ΔV of the rotary tank 4 through the rotation sensor 27 is started. (Step A8).

After the motor 17 is cut off as described above, the rotary tub 4 is inertially rotated. In this state, the rotation speed ΔV of the rotary tub 4 decreases to the braking start rotation speed Vs or less. Wait until (step A9).

Then, when the rotation speed ΔV of the rotary tank 4 decreases to the braking start rotation speed Vs, the brake device is operated to start the braking of the rotary tank 4 (step A1).
0), and thereafter waits until the rotation speed ΔV of the rotary tank 4 becomes zero, that is, until the rotary tank 4 stops (step A11). When the rotary tank 4 is stopped, the operation of detecting the rotation speed ΔV through the rotation sensor 27 is completed (step A12), and thereafter, water is supplied into the rotary tank 4 through the water supply valve 21 for the first rinse. Perform step A13.

After completion of the water supply step A13, a "first rinsing" step A14 for performing a rinsing operation for a set time with the stirring body 5, a "drainage" step A15 for draining from the rotary tank 4, The "dehydration" step A16 for performing the dehydration operation by rotating the rotary tank 4 for the set time is sequentially executed.

When the "dehydration" step A16 is completed, the steps A17 to A21 similar to the above-described steps A8 to A12 are executed, and then the water is supplied to the rotary tank 4 through the water supply valve 21 for the second rinsing. The step A22 of supplying water into the inside is executed.

After completion of the water supply step A22, a "second rinse" step A23, a "drainage" step A24, and a "dewatering" step A for performing a final dehydration operation.
25, steps A26 to A30 similar to steps A8 to A12 described above are executed, and a series of washing operation is completed by execution of step A30 for ending the detection operation of the rotation speed ΔV through the rotation sensor 27.

The above-described control example according to FIG. 1 is for the case where the silent operation course is not selected, but when the silent operation course is selected, the control shown in the flowchart of FIG. 2 is performed. That is, as shown in FIG. 2, when the silent operation is selected, the weight detection step A1 is followed immediately by the water supply step A4.
The cloth quality detection step A2 and the step A3 for setting the braking start rotation speed Vs (both see FIG. 1) are not executed.

After executing steps A4 to A8, that is, at the time when the set dehydration operation time has elapsed (at this time, the rotary tank 4 is inertially rotated in accordance with the disconnection of the motor 17 and is rotated. When the rotational speed ΔV of the tank 4 is being detected), the process waits until the rotational speed ΔV becomes zero (step A31). When the rotary tub 4 stops, the brake device is operated to restrain the rotation of the rotary tub 4 (step A10).
The detection operation of the rotation speed ΔV through is ended (step A12).

Next, for the first time, the rinse water supply step A13, the "rinse" step A14, the "drainage" step A15, the "dewatering" step A16, and the motor 17 are turned off, and the rotation speed ΔV of the rotary tank 4 is increased. Step A17 for starting the detection operation is sequentially executed, and thereafter, the process stands by until the rotation speed ΔV of the rotary tank 4 becomes zero (step A32). When the rotary tank 4 is stopped, the brake device is operated to restrain the rotation of the rotary tank 4 (step A1).
9) After that, the detection operation of the rotation speed ΔV through the rotation sensor 27 is ended (step A21).

After this, the above steps A12 to A17, A for rinsing and final dehydration for the second time are carried out.
32, A19, steps A22 to A2 similar to A21
6, A33, A28, A30 are executed, and the series of washing operations is ended accordingly.

In short, according to the configuration of the present embodiment described above, the braking start rotation speed Vs when braking the rotary tub 4 in the inertia rotation state after the dehydration operation is started by the brake device is within the rotary tub 4. When the weight of the loaded laundry is large and when the laundry has a high water content, that is, when the inertial weight of the rotary tub 4 is large, the value is changed and set to a lower value. .

Therefore, when the inertial weight of the rotary tank 4 is large, the brake device is not operated from the time when the rotational speed of the rotary tank 4 is relatively high. As a result, the stress applied to the brake device (particularly the brake band 18
Since the stress applied to a) does not become extremely large, the reliability of the life of the brake device is improved, and a situation in which a large brake operation noise is generated can be prevented.

When the inertial weight of the rotary tub 4 is relatively small, that is, when it is not necessary to consider the magnitude of the stress applied to the brake device, the brake device is started from the time when the rotational speed of the rotary tub 4 is relatively high. Is operated, there is no possibility that the time until the rotation tank 4 is braked after the dehydration operation is unnecessarily prolonged.

Further, for example, in the state where the silent operation course is selected to perform the laundry operation at midnight, the rotation of the rotary tub 4 is stopped and then the brake device is operated to operate the rotary tub 4 concerned.
Since it is configured to restrain the rotation of the vehicle, it is possible to reliably prevent a situation in which annoying brake operation sound is generated.

In the flow chart shown in FIG. 1 of the first embodiment, the second embodiment of the present invention is used in place of the control by steps A11, A20 and A29 executed after the operation of the brake device is started. The control shown in FIG. 6 may be performed.

That is, FIG. 6 partially shows the control contents of the control circuit 25, and each step of starting the operation of the brake device (steps A10, A19, A in FIG. 1).
After executing 28), the braking reference time Ts corresponding to the braking start rotation speed Vs is set (step a1), and thereafter, the braking reference time Ts is waited for (step a2).
When the braking reference time Ts has elapsed, it is determined whether the rotation speed ΔV of the rotary tank 4 has become zero, that is, whether the rotary tank 4 has stopped (step a3). Here, "YE
S ”, in other words, if the rotary tank 4 is stopped within the braking reference time Ts after the operation of the brake device is started, the process directly returns (the return destination is steps A12 and A21 shown in FIG. 1). , A30).

On the other hand, when it is judged "NO" in step a3, in other words, when the rotary tank 4 is not stopped even after the braking reference time Ts has elapsed after the operation of the brake device is started, , It is determined that there is an abnormality in the braking function of the brake device, and the abnormality notification step a4
To execute. In the abnormality notification step a4, for example, the buzzer 29 is used to notify that an abnormal state has occurred, and control is performed to maintain the state in which the content of the abnormality is displayed on the display unit 28 before returning.

Therefore, in the case of such a configuration,
There is an advantage that the user can be informed early that the function of the brake device has deteriorated. The braking reference time Ts is set to a longer value as the braking start rotation speed Vs is higher.
When s is 100 rpm, it is set to about 2 seconds.

FIGS. 7 to 9 show a third embodiment of the present invention, and only the parts different from the first embodiment will be described below. That is, in FIG. 9, the control circuit 2
A detection output from a vibration sensor 31 (corresponding to the amplitude detection means in the present invention) that detects the amplitude of the rotary tank 4 is input to the circuit 5.

FIG. 7 shows the main part of the control contents by the control circuit 25. In FIG. 7, when the “dehydration” step A7 after the washing operation is completed, that is, when the set dehydration operation time has elapsed, the amplitude ΔA of the rotary tank 4 detected by the vibration sensor 31 is read (step B
1) Then, step B2 for setting the braking start rotation speed Vs based on the amplitude ΔA is executed.

In this case, in step B2, the braking start rotational speed Vs is set on the basis of, for example, a previously stored table as shown in FIG. As is clear from FIG. 8, the braking start rotation speed Vs is set to a higher value as the amplitude ΔA detected by the vibration sensor 31 is larger.

After the braking start rotational speed Vs is set as described above, the motor 17 is turned off, and the operation of detecting the rotational speed ΔV of the rotary tank 4 through the rotation sensor 27 is started (step B3).

After the inertial rotation of the rotary tank 4 is started in response to the disconnection of the motor 17 as described above, the rotation tank 4 waits until the rotation speed ΔV of the rotary tank 4 drops below the braking start rotation speed Vs (step B4). Then, when the rotation speed ΔV of the rotary tank 4 decreases to the braking start rotation speed Vs, the brake device is operated to start the braking of the rotary tank 4 (step B5), and thereafter, until the rotary tank 4 stops. Stand by (step B6). When the rotary tank 4 stops,
The detection operation of the rotation speed ΔV through the rotation sensor 27 is ended (step B7), and thereafter, the process proceeds to the water supply step A13 for rinsing for the first time.

The steps B1 to B6 as described above are
Each "dehydration" step (corresponding to A16, A25 in Fig. 1) after each of the first and second rinse operations other than when the above-described "dehydration" step A7 after the washing operation is completed.
Is also done when is finished.

According to this embodiment having such a configuration,
Braking start rotation speed Vs at the time of starting braking of the rotary tub 4 in the inertial rotation state by the brake device after completion of the dehydration operation
Is set to a higher value as the amplitude ΔA detected by the vibration sensor 31 is larger. Therefore, when the amplitude of the rotary tank 4 is large, the braking operation by the brake device is started at a relatively early timing, so that the rotary tank 4 is inertially rotated while the amplitude of the rotary tank 4 is large. The state will no longer continue indiscriminately for a long time. As a result, the time during which a large stress is applied to components such as the drain hose 10 and the lead wire (not shown) provided around the rotary tank 4 can be shortened, and the reliability of the life of these peripheral components is improved. .

The present invention is not limited to the above-mentioned embodiment, but the following modifications or expansions are possible. In the first embodiment, with respect to the braking start rotation speed Vs,
Although both the weight and the cloth quality of the laundry put into the rotary tub 4 are reflected, it is also possible to reflect only one of them. The braking start rotation speed tables shown in FIGS. 3 and 8 are examples, and in practice, different tables are used according to differences in the weight and shape of the rotary tank 4.

[0061]

As is apparent from the above description, in the invention described in claims 1 and 2, the rotation speed of the rotary tank when the brake device is operated after the dehydration operation is finished is determined by the inertia weight of the rotary tank. Since it is automatically changed so that it becomes lower when it is large, it is possible to prevent unnecessary increase in the time until the rotation tank is braked after the dehydration operation is completed, and the reliability of the life of the braking device is improved. Improvement can be realized.

According to the third aspect of the invention, the rotation speed of the rotary tank when the brake device is operated after the dehydration operation is automatically changed so as to increase as the amplitude of the rotary tank increases. Therefore, the state in which the rotary tank is inertially rotated while the amplitude of the rotary tank is large disappears unnecessarily for a long time.
It is possible to prevent a situation in which a large stress is applied to the peripheral parts when the rotation tank is braked and stopped, and it is possible to improve the reliability of the life of the peripheral parts.

[Brief description of drawings]

FIG. 1 is a flow chart showing a control content in the first embodiment of the present invention (Part 1)

FIG. 2 is a flow chart showing control contents 2

FIG. 3 is a diagram showing a table used when setting a braking start rotation speed.

[Fig. 4] Overall vertical side view

FIG. 5 is a functional block diagram showing an electrical configuration.

FIG. 6 is a flowchart showing a main part of control contents in the second embodiment of the present invention.

FIG. 7 is a flowchart showing a main part of control contents in the third embodiment of the present invention.

FIG. 8 is a diagram showing a table used when setting a braking start rotation speed.

FIG. 9 is a functional block diagram showing an electrical configuration.

[Explanation of symbols]

In the drawings, 1 is an outer box, 2 is an outer tub, 4 is a rotating tub, 5 is a stirrer, 10 is a drain hose, 17 is a motor, 18 is a drive mechanism section, 18a is a brake band, 25 is a control circuit (amount of laundry). 27 is a rotation sensor (rotational speed detection means), and 31 is a vibration sensor (amplitude detection means).

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Nishimura Inventor Takashi Nishimura 2-33-10 Nanishi, Nishi-ku, Nagoya City Toshiba Abu E. Ltd. Nagoya Office (56) Reference JP-A-3-139396 (JP, JP, A) JP-A-6-142389 (JP, A) JP-A-6-126082 (JP, A) JP-A-63-318994 (JP, A) JP-A-6-225985 (JP, A) JP-A-7 −299278 (JP, A) Actual Kaihei 3-111280 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) D06F 33/02

Claims (3)

(57) [Claims] 1. A rotary tub rotated by a motor during a dehydration operation, a laundry amount detecting means for detecting the weight of the laundry stored in the rotary tub, and a rotation speed of the rotary tub during a dehydration operation. Rotational speed detection means, a braking device for braking the rotary tub, and the motor is cut off when the dehydration operation is completed, and the rotation speed detection means detects a rotation speed that is preset after the cutoff. And a control means for operating the braking device when the braking start rotation speed is reduced to a lower value, the control means changing the braking start rotation speed to a lower value as the weight detected by the laundry amount detection means is larger. A washing machine characterized by that. 2. A rotating tub rotated by a motor during a dehydration operation, a cloth quality detecting means for detecting a cloth quality of laundry stored in the rotating tub, and a rotation speed of the rotating tub during a dehydration operation. Rotation speed detecting means, a braking device for braking the rotary tub, and the motor is cut off when the dehydration operation is completed, and after the cutoff, the rotation speed detected by the rotation speed detecting means is preset. Control means for operating the braking device when the braking start rotation speed is lowered to a predetermined braking start rotation speed, wherein the control means performs the braking when the cloth quality detected by the cloth quality detection means is high in water content. A washing machine characterized by changing a starting rotation speed to a low value. 3. A rotating tub rotated by a motor during a dehydration operation, an amplitude detecting means for detecting an amplitude when the rotating tub is rotated, and a rotation speed for detecting a rotation speed of the rotating tub during a dehydration operation. Detection means, a braking device for braking the rotary tub, and the motor is cut off when the dehydration operation is completed, and after the cutoff, the rotation speed detection means detects a rotation speed that is preset. Control means for operating the brake device when the rotation speed is reduced to a start rotation speed, and the control means changes the braking start rotation speed to a higher value as the detected amplitude by the amplitude detection means is larger. And a washing machine.