JPH1057663A - Operation control method for fully automatic washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a smooth washing process by reducing a phenomenon in which an outer drum is in contact with an outer frame when the outer frame and a washing/dewatering drum vibrate significantly and preventing dewatering ability from lowering due to the lack in rotation frequency for dewatering resulting from the above phenomenon. SOLUTION: When clothes are suddenly moved or water contained in clothes with low water permeability is suddenly flown out during a continuous dewatering process, the rotation frequency of a washing/dewatering drum is significantly reduced. By utilizing this phenomenon, a rotation frequency is continuously measured during the continuous dewatering process, a specified rotation frequency is compared with the rotation frequency significantly reduced, when the difference is higher than a value specified, it is determined as a failure dewatering process, and the motor is turned off, the washing/dewatering drum is fed with water to a specified water level by a water feeding device, clothes are smoothed by circulation, then the dewatering process is performed again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a washing and dehydrating process in a fully automatic washing machine.

[0002]

2. Description of the Related Art At present, in a fully automatic washing machine, water is drained after a washing or rinsing process, and the process shifts to a dehydration process. In the dehydration process, it was usual to perform continuous operation after performing intermittent dehydration by gradually draining water from the laundry while repeatedly turning on and off the motor, and gradually increasing the dehydration rotation speed.

[0003]

According to the above-described method of controlling a fully automatic washing machine, when the dewatering process is performed in a state where the clothes are unstable, the clothes in the washing and dewatering tub are moved outward by centrifugal force. In particular, when the clothes suddenly move during continuous spin-drying at a high rotation speed, the vibration and the run-out of the washing and spin-drying tub increase, and the outer tub hits the outer frame. In addition, since the rotation speed of the washing and dewatering tub is lowered, the washing liquid contained in the water in the clothes cannot be sufficiently dehydrated,
Problems such as a decrease in rinsing performance and a decrease in dehydration performance also occur. In addition, similar phenomena are likely to occur with respect to clothes having poor water repellency due to a sudden release of moisture contained in the clothes at a high rotation speed.

[0004] It is an object of the present invention to provide a smooth washing process so that the above problem does not occur even when an abnormal phenomenon of clothes occurs during the dehydrating process.

[0005]

In order to achieve the above object, a washing and dewatering tub, a motor for rotating the washing and dewatering tub, and a stirring blade, and a control device for automatically performing washing, rinsing, and dewatering processes are provided. And a water supply device that automatically supplies water to a set water level by the control device, and a rotation speed detection unit that detects a rotation speed of the washing and dewatering tub, and a control unit that controls a rotation speed of the washing and dewatering tub. During the spin-drying process, the rotation speed of the washing and spin-drying tub is constantly detected and the change in the spin speed is read.
When the clothes in the washing and dewatering tub move outward due to centrifugal force, especially when the clothes suddenly move during continuous dehydration with a high rotation speed, or when the water contained in the clothes with poor water release suddenly comes out. In this case, the number of revolutions of the washing and dewatering tub drops sharply. Utilizing this, the continuous rotation speed is read during continuous dehydration, and the set rotation speed is compared with the suddenly reduced rotation speed. If the difference is equal to or more than an arbitrary set value, it is determined that the dehydration process is abnormal. Then, the motor is turned off, the washing and dewatering tub is supplied with water to the set water level by the water supply device, the state of the clothes is kept uniform by stirring, and the dehydration process is performed again.

[0006] By the above means, when the clothes in the washing and dewatering tub move outward due to centrifugal force, particularly when the clothes suddenly move during continuous dehydration at a high rotation speed, or when the clothes are not well-watered. Even when the water suddenly comes out, it is possible to reduce the vibration of the outer frame and the contact of the outer tank with the outer frame. In addition, a decrease in rinsing performance and dehydration performance caused by insufficient spinning speed of dehydration is improved, and a smooth washing process can be performed.

[0007]

Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a washing machine adopting an embodiment of the present invention, an outer tub 4 made of synthetic resin is suspended by a suspension rod 2 in an outer frame 1 made of a steel plate and a vibration isolator 3 made of a coil spring or elastic rubber. Four suspension rods 2 and anti-vibration devices 3 are provided to be mounted.

In the outer tub 4 for storing water for washing,
A washing and dewatering tub 5 made of synthetic resin is rotatably provided. A large number of dewatering holes 5a are provided in the washing and dewatering tub 5, and a stirring blade 6 made of a pulsator or an agitator is rotatably provided at the center bottom. During the washing operation and the rinsing operation, the washing and dewatering tub 5 is stopped and the stirring blade 6 is rotated clockwise and counterclockwise. In addition, at the time of spin-drying, washing and spin-drying tub 5
Is rotated in one direction. The rotation of the stirring blade 6 and the washing and dewatering tub 5 is performed by a driving device 7.

The driving device 7 includes a motor 8 and a transmission means 9 including pulleys 9 a and 9 b and a belt 9 c for transmitting the rotation of the motor 8 to the stirring blade 6 or the washing and dewatering tub 5.
A clutch device 10 for rotating only the stirring blade 6 at the time of washing and rinsing, or a washing and spinning tub 5 for spin-drying, a solenoid 11 for switching between them, and a drainage device 15 for draining.

The clutch device 10 is provided with a rotation speed detecting device 20 for detecting the rotation speed of the washing and dewatering tub 5.

The driving device 7 is fixed to the bottom of the outer tub 4 by using a support plate 12 made of a steel plate. The outer tank 4 transmits the pressure of water in the outer tank 4 to a water level sensor 13. An inlet 4a for connecting the S tube 14 is provided.

In the upper part of the outer frame 1, there is an input port 17a for inputting laundry and an operation box 1 for storing electric parts such as a controller.
7b is provided with a top cover 17 made of synthetic resin. A lid 18 made of a synthetic resin is provided at the inlet 17a.

An operation panel 21 is mounted on the upper surface of the operation box 17b, and a water supply electromagnetic valve 24 is provided in the operation box 17b.

Water level sensor 13 arranged in operation box 17b
By detecting the pressure of water in the outer tub 4, it is determined whether or not water has accumulated up to a specified water level. The water level sensor 13 includes a core, a coil, a spring, and the like.

A controller for controlling washing, rinsing, dehydration and the like is disposed in the storage box 31. The operation panel 21 includes a power switch button 29 and an external operation switch 3.
0 is arranged.

FIG. 2 shows the structure of the rotation speed detecting device 20. The rotation speed detecting device 20 is provided with a coil 20a on the solenoid 11 for switching the clutch device 10 and a magnet 20b on the pulley 9a, so that the washing and dewatering tub 5 is provided.
Then, a current is generated in the coil 20a, and the signal is calculated by the central processing unit 34 to detect the number of revolutions of the washing and dewatering tub 5.

FIG. 3 schematically shows a circuit of the entire washing machine. The central processing circuit 34 and the drive circuit 35 are arranged as a controller unit and are arranged in the storage box 31 of the main body of the washing machine. Motor 8, water supply valve as water supply electromagnetic valve 24, drainage valve as drainage device 15, select switch 36 for washing, rinsing, dehydration, etc., water level sensor 13, cloth amount / cloth sensor for cloth amount / cloth determination 37, a safety switch 50 for preventing abnormal vibration during dehydration and the like, and a rotation speed detecting device 20 for detecting the rotation speed.

After the washing step and the rinsing step, the drain valve 15 is energized by a signal from the central processing circuit 34 to perform the drain step. When the draining process is completed, the motor 8 is energized to rotate the washing and dewatering tub 5, and the washing liquid contained in the clothes in the washing and dewatering tub 5 is taken out by the centrifugal force. In order to gradually discharge the washing liquid contained in the washing and dewatering tub, the motor 8 is intermittently energized, the washing and dewatering tub 5 is rotated slowly, and the intermittent dehydration for preventing the washing liquid from collecting in the outer tub 4 ( 4), followed by continuous dehydration.
However, in the conventional dehydration process, when the clothes in the washing and dewatering tub move outward due to the centrifugal force, especially when the clothes suddenly move during continuous dehydration with a high rotation speed, the motor 8 is operated until the time elapses. Keep on energizing. As a result, the vibration and the run-out of the washing and dewatering tub increase, causing a phenomenon in which the outer tub hits the outer frame, and the rotation speed of the washing and dewatering tub also decreases. Cannot be sufficiently dewatered, so that there is a problem that the rinsing performance and the dehydration performance are lowered.

Therefore, in order to improve the problem in the dewatering process, the present invention will be described with reference to FIG. 5, in which the number of rotations is detected every T seconds from the start of the continuous dehydration and is compared with the number of rotations detected one by one before. If the clothes suddenly move, the number of revolutions of the washing and dewatering tub 5 drops rapidly, so it takes time to return to the original number of revolutions again. At this time, if the difference between the rotation speed N ′ detected T seconds later than the rotation speed N detected earlier is larger than an arbitrary set value ΔN, it is determined that an abnormality has occurred during dehydration, and the motor 8 is turned off to supply water. Turn on solenoid valve 24
Then, the washing and dewatering tub 5 is supplied with water to the set water level while being detected by the water level sensor 13, the state of the clothes is kept uniform by stirring, and the dewatering process is performed again.

FIG. 6 is a flowchart showing the above operation. Intermittent dehydration is performed in step 51, and after the intermittent dehydration is completed, the motor 8 is turned on (step 52). Next, at step 53, the rotation speed N is detected from the rotation speed detection device 20, and after T seconds, the rotation speed N 'is detected again (step 5).
4, 55). In step 56, the difference between the rotational speeds N and N 'is Δ
If it is smaller than N, the rotation speed N 'is set to N (step 5).
7) Steps 54 to 58 until the time of continuous dehydration ends
repeat. Step 59 when the continuous dehydration time is over
Then, the motor 8 is turned off for a predetermined time, and the process proceeds to the next step (step 60). However, when the difference between the rotation speeds N and N 'is larger than ΔN in step 56, the motor 8 is turned off in step 61 to perform water supply and agitation (step 62,
63). After that, the drainage step (step 64) is performed, and the dehydration step is performed again.

[0021]

As described above, according to the present invention, when the clothes in the washing and dewatering tub move outward due to centrifugal force, particularly when the clothes suddenly move during continuous dehydration at a high rotation speed, or when the clothes are dehydrated. Even when the water contained in the poorly watered clothing suddenly comes out, the vibration of the outer frame and the contact of the outer tub with the outer frame can be reduced, and a highly reliable dehydration process can be performed. In addition, a decrease in rinsing performance and dehydration performance caused by insufficient spinning speed of dehydration is improved, and a smooth washing process can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fully automatic washing machine showing one embodiment of the present invention.

FIG. 2 is a detailed view of a rotation speed detecting device according to an embodiment of the present invention.

FIG. 3 is a schematic circuit diagram of the entire washing machine.

FIG. 4 is a diagram showing a rotation speed indicating a conventional dehydration process.

FIG. 5 is a diagram showing a rotation speed indicating a dehydration process of the present invention.

FIG. 6 is a flowchart showing one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer frame, 5 ... Washing and dewatering tank, 8 ... Motor, 10 ... Clutch device, 11 ... Solenoid, 13 ... Water level sensor, 20
... Rotation speed detection device, 20a ... Coil, 20b ... Magnet, 2
4 ... water supply solenoid valve, 34 ... central processing unit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Isao Hiyama 1-1-1 Higashitagacho, Hitachi City, Ibaraki Prefecture Inside the Taga Headquarters, Electric Appliances Division, Hitachi, Ltd. 1-1-1, Higashitaga-cho, Hitachi, Ltd.Electrical Equipment Division, Hitachi, Ltd.Electrical Equipment Division, Hitachi, Ltd. (72) Inventor Yasushi Shinko 1-1-1, Higashitaga-cho, Hitachi, Ibaraki, Japan Inside the Taga Headquarters (72) Inventor Masao Watanabe 1-1-1 Higashitagacho, Hitachi City, Ibaraki Prefecture Inside the Taga Headquarters, Hitachi, Ltd.

Claims (4)

[Claims] 1. A washing and dewatering tub, a motor for rotating the washing and dewatering tub or the stirring blade, a control device for automatically performing washing, rinsing, and dewatering processes, and a water supply automatically to a set water level by the control device. A fully automatic washing machine having a water supply device, a rotation speed detecting means for detecting the rotation speed of the washing and dewatering tub, and a control means for controlling the rotation speed of the washing and dewatering tub, A fully automatic washing machine characterized in that when the set rotation speed of the water tank changes suddenly, the dehydration process shifts to another process according to the change in the rotation speed. 2. The method according to claim 1, wherein a difference between the set rotation speed and the rapidly changed rotation speed is detected, and when an arbitrary set value is satisfied, the process shifts from the dehydration process to another process. Fully automatic washing machine featuring. 3. The fully automatic washing machine according to claim 1, wherein the power supply to said motor is stopped according to a change in the number of revolutions. 4. The method according to claim 1, wherein after the power supply to the motor is stopped, water is supplied into the washing and dewatering tub by the water supply device, stirring is performed after the water supply, and after the draining process, A fully automatic washing machine characterized by performing the dehydration process again.