JP3233583B2 - Operation control method of fully automatic 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 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. And the ON time of the motor in the intermittent dehydration operation,
As the OFF time and the number of times, a signal of the voltage between the capacitor terminals is detected in the early stage of the operation, the quantity and quality of the clothes are determined, and a time limit set according to the state of the clothes is used.

[0003]

In the above-described method of controlling a fully automatic washing machine, in the dehydration process, if there is a deviation of the laundry or the like, the washing and dewatering tub is used in the conventional intermittent dehydration. The number of revolutions does not increase easily, and passes through the vibration resonance point a plurality of times. For this reason, the vibration and the run-out of the washing and dewatering tub increase, and the outer tub hits the outer frame, and the process ends with insufficient dewatering. Then, in the dehydration process, if the phenomenon in which the number of revolutions does not easily rise due to intermittent dehydration occurs as described above, continuous dehydration is performed after intermittent dehydration, but during the continuous dehydration, washing water is placed between the washing and dehydrating tub and the outer tub. If bubbles accumulate due to the rotation of the washing and dewatering tub, detergent foaming failure is likely to occur. When a detergent foaming failure occurs, the load on the motor increases, and an increase in current flowing through the motor causes an odor, smoke, and the like from the motor. In addition, since the washing and dewatering tub proceeds to the rinsing process before reaching the rated rotation speed, the washing liquid contained in the water in the clothes cannot be sufficiently dewatered, so that the rinsing performance and the dewatering performance are reduced. Also occurs. Further, even when the voltage is low and the output of the motor is insufficient, the number of rotations of the washing and dewatering tub does not increase because the vibration passes through the vibration resonance point a plurality of times.
As described above, problems such as vibration of the outer frame and obstruction of detergent foaming occur.

[0004] It is an object of the present invention to smoothly carry out the dewatering process even in the washing process in all situations so as not to cause the above problem.

[0005]

SUMMARY OF THE INVENTION The present invention provides a washing and dewatering tub, a motor for rotating the washing and dewatering tub, a rotation speed detecting means for detecting a rotation speed of the washing and dewatering tub, and a washing and dewatering tub. Control means for controlling the rotation speed of the spin-drying tub, a plurality of set rotation speed and a set time to avoid the vibration resonance point in order to prevent the detergent foaming failure in the dehydration process, the motor until the set rotation speed is reached When the washing and dewatering tub reaches the set rotation speed continuously, the motor is repeatedly turned on and off for a set time, and the motor is continuously turned on until the next set rotation speed is reached again. So that the motor is turned on for each set time each time the set speed is reached.
In the fully automatic washing machine that repeats -OFF, the control means determines the amount and quality of the clothes in the washing and spin-drying tub, and sets each of the set number of revolutions and each set time according to the amount and quality of the clothes. It is characterized by doing.

[0006] By the above-mentioned means, it is possible to reduce the occurrence of detergent foaming obstacles and to increase the amount of water in the clothes due to insufficient dehydration rotation speed due to the contact with the outer frame of the outer tub during intermittent dehydration when laundry is offset. The accompanying rinsing performance and dehydration performance can be improved. In addition, a normal washing process can be performed even when the washing condition such as the state of clothes, voltage, and frequency changes.

[0007]

Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a washing machine employing an embodiment of the present invention has an outer tub 4 made of a synthetic resin 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. The suspension rod 2 and the vibration isolator 3 which are configured to be suspended are provided in four pieces.

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 during washing and rinsing, or a washing and spinning tub 5 for spin-drying, and a solenoid 11 for switching between them.
It comprises a drainage device 15 that controls drainage.

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 shows the operation panel 21. The operation panel 21 includes a display unit 32, an external operation switch 30, and a start button 33. The display unit 32 displays information of water level, washing, rinsing, spin-drying, reservation time, and course setting. The external operation switch 30 is provided with a select switch button for selecting and setting the water level, washing, rinsing, spin-drying, reserved time, and each washing course.

FIG. 4 shows a simplified circuit diagram 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.

FIG. 5 shows a circuit of the cloth amount / cloth sensor 37 for detecting the cloth amount / cloth. In the laundry amount detection control, first, appropriate clothing is put into the washing and dewatering tub 5, the power switch button 29 is pressed, and the start button 33 is pressed, whereby the motor 8 is operated. The operation of the motor 8 is performed by sending signals alternately to the gates of the triacs 37a and 37b as required by a command from the central processing circuit 34, so that the motor 8 rotates forward and backward. From the forward / reverse rotation of the motor 8, the clothes are moved by rotating the stirring blade 6 forward / reverse by the rotation transmission method shown in FIG.
At this time, the voltage between the terminals of the driving capacitor 8a of the back electromotive force generated when the motor 8 is turned off is converted into a DC rectangular wave pulse by the photo-triac coupler 38, and the inverter 3
9, the DC square wave is inverted, and the signal is processed by the central processing circuit 3.
Send to 4. By these controls, the resistance applied to the stirring blade 6 changes depending on the size of the clothes, and the degree of this change is detected to determine the amount of the clothes. After the cloth amount is determined, the cloth quality detection control is performed. With the cloth quality detection control, after performing the cloth amount detection control, the water supply electromagnetic valve 24 is energized by a signal from the controller unit,
Water is supplied into the washing and dewatering tub 5. When the water level sensor 13 detects that the water has been supplied to the specified water level, the motor 8 rotates forward and backward similarly to the cloth amount detection control, and a signal (T ₁ ) of the voltage between the terminals of the driving capacitor 8 a of the generated back electromotive force is generated. To the central processing circuit 34 (FIG. 6). Next, water is supplied into the washing and dewatering tub 5 up to the water level determined by the cloth amount detection control, and when the water level sensor 13 detects that the water has been supplied to the cloth amount determination water level, the motor 8 is activated similarly to the cloth amount detection control. The reverse rotation is performed, and a signal (T ₂ ) of the voltage between the terminals of the driving capacitor 8 a of the generated back electromotive force is sent to the central processing circuit 34 (FIG. 7). The cloth quality is determined from the changes in the signals T ₁ and T ₂ .

After the cloth quality detection control is completed, a washing process is performed. After the washing process is completed, the drain valve 15 is energized by a signal from the central processing circuit 34 to perform the drain process. 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. At this time, if the washing and dewatering tub 5 is continuously rotated, the amount of water flowing out of the washing and dewatering tub 5 becomes larger than the amount of water drained from the drain port 16.
The washing liquid collects. Since the washing liquid accumulated in the outer tub 4 is stirred by the rotating washing and dewatering tub 5, bubbles increase, and the surface tension of the foam prevents rotation of the washing and dewatering tub 5. An increase in the flowing current causes problems such as generation of an odor and smoke from the motor (detergent foaming failure).

Conventionally, to reduce this problem, the motor 8
Is intermittently performed, the washing and dewatering tub 5 is slowly rotated to perform intermittent dehydration (FIG. 8) for preventing the washing liquid from collecting in the outer tub 4, and then continuous dewatering is performed. However, in the case of the conventional intermittent dehydration, if the cloth is offset,
The whirling of the washing and dewatering tub 5 increases, and the rotation of the motor 8 does not increase at the vibration resonance point, so that the washing liquid in the clothes is not discharged from the drain port 16. For this reason, in the subsequent continuous dehydration, the washing liquid accumulates in the outer tub 4 and is stirred by the washing and dewatering tub 5, so that the foam increases and the above-mentioned detergent foaming obstruction occurs. Further, in the conventional intermittent dehydration, when the whirling of the washing and dewatering tub 5 becomes large due to the offset of the cloth, the outer tub 4 hits the outer frame 1 and the safety switch 50 because the outer tub 4 hits the outer frame 1 and the safety switch 50 normally. It may cause the washing process not to be performed. In addition, since the rotation of the motor 8 does not increase, it causes rinsing and dehydration performance deterioration. In addition, the same problem as described above occurs because the rotation speed of the washing and dewatering tub 5 does not increase even when the washing condition changes due to voltage or the like.

Therefore, the present invention will be described with reference to FIG. 9 in order to improve the disadvantages in the washing step. Referring to FIG. 9, the washing and dewatering tub 5 has two resonance points, a vibration resonance point a and a vibration resonance point b. The motor 8 is continuously energized from the start of the stroke to the number of revolutions N1 of the washing and dewatering tub 5 between the vibration resonance point a and the vibration resonance point b. When the rotation speed reaches N1, the power supply to the motor 8 is stopped for Ta seconds, and thereafter, the motor 8 is supplied again to the rotation speed N1. These series of operations are repeated for T1 seconds, and thereafter, the motor 8 is continuously energized to a rotation speed N2 higher than the vibration resonance point b. When the rotation speed reaches N2, the power supply to the motor 8 is stopped for Ta seconds, and then the rotation speed N
2 until the motor 8 is energized. These series of operations are called T2
After that, a series of operations is repeated n times, such as T3 seconds at the rotation speed N3 and Tn seconds at the rotation speed Nn.

FIG. 10 is a flowchart showing the above operation. In step 51, the cloth amount detection control is performed to determine the amount of clothing. Next, at step 52, the cloth quality detection control is performed to determine the quality of the clothing. The set rotation speed N, set time T, and set number n are determined (steps 53, 54, and 55) in accordance with the determination of the cloth amount and the cloth quality (steps 53, 54, and 55). After the washing process, the drainage process (step 57) is performed, then the motor 8 is energized in step 58, and in steps 59 and 60, the rotational speed is detected by the rotational speed detecting device 20 to reach the set rotational speed N. Energize the motor 8 until When the set rotation speed N is reached, the motor 8 is de-energized for Ta seconds in step 61, and the motor 8 is turned on again until the set rotation speed N is reached (steps 62, 63, 6).
4). The operations of these steps 62 to 64 are repeated for T seconds (step 65). Step 66 is performed until the operations of 61 to 65 are completed n times, and then the process proceeds to the next step.

[0024]

As described above, according to the present invention, the amount of clothing
The washing and dehydration process that avoids the detergent foaming failure and resonance vibration can be realized without being affected by the quality and the quality.
And a dehydration step.

[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 detailed view of an operation panel showing one embodiment of the present invention.

FIG. 4 is a schematic circuit diagram of the entire washing machine.

FIG. 5 is a circuit diagram of an embodiment of cloth amount / cloth detection.

FIG. 6 is a detailed view of one embodiment of cloth amount detection.

FIG. 7 is a detailed view of an embodiment of cloth detection.

FIG. 8 is a diagram showing time and the number of rotations showing a conventional dehydration process.

FIG. 9 is a diagram showing a time and a rotation speed showing a dehydration process of the present invention.

FIG. 10 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, 20 ... Rotation speed detection device,
20a: coil, 20b: magnet, 34: central processing unit,
50 ... Safety switch.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Isao Hiyama 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd.Electrical Equipment Division, Taga Headquarters 1-1-1, Tagacho Hitachi, Ltd.Electrical Equipment Division, Taga Headquarters (72) Inventor Yasushi Shinko 1-1-1, Higashitagacho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd.Electrical Equipment Division, Taga Headquarters (72) Inventor Masao Watanabe 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Pref. Hitachi, Ltd.Electrical Equipment Division, Taga Headquarters (56) References JP-A-5-115660 (JP, A) JP-A-3 −251295 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D06F 33/02 D06F 49/04

Claims (3)

(57) [Claims] 1. A washing and dewatering tub, a motor for rotating the washing and dewatering tub, a rotation speed detecting means for detecting a rotation speed of the washing and dewatering tub, and controlling a rotation speed of the washing and dewatering tub. A control means for setting a plurality of set rotation speeds and a set time avoiding a vibration resonance point in order to prevent a detergent foaming failure in a dehydration process, and continuously turning on the motor until the set rotation speed is reached; When the combined spin-drying tub reaches the set number of revolutions, the motor is repeatedly turned on and off for a set time, and the motor is continuously turned on until the next set number of revolutions is reached. In the fully automatic washing machine, which repeats the ON / OFF of the motor for each set time each time it reaches, the control means determines an amount of clothes in the washing and spin-drying tub, and the set number of rotations according to the amount of clothes. And each set time A fully automatic washing machine characterized in that it is set. 2. The apparatus according to claim 1, wherein the control device is a garment.
A fully automatic washing machine characterized in that the quality of the garment is determined and the set rotation speed and the set time are set according to the quantity and quality of the clothes. 3. A washing and dewatering tub, a motor for rotating the washing and dewatering tub, a rotation speed detecting means for detecting a rotation speed of the washing and dewatering tub, and controlling a rotation speed of the washing and dewatering tub. A control means for setting a plurality of set rotation speeds and a set time avoiding a vibration resonance point in order to prevent a detergent foaming failure in a dehydration process, and continuously turning on the motor until the set rotation speed is reached; When the combined spin-drying tub reaches the set number of revolutions, the motor is repeatedly turned on and off for a set time, and the motor is continuously turned on until the next set number of revolutions is reached. In the fully automatic washing machine, which repeats ON / OFF of the motor for each set time each time the control reaches, the control device determines the quality of the clothes, and sets each of the set number of revolutions and each set time according to the quality of the clothes. What I did A fully automatic washing machine characterized by the following.