JPH0775698A - Operation control of fully automatic washing machine - Google Patents

Abstract

PURPOSE:To prevent a deviation of cloth so that washing clothes can be dehydrated after they are made a uniform state by stirring them for several seconds to several minutes in accordance with the quality of cloth by a water flow shorter than a stirring water flow at the time of washing or rinsing, before transferring to a draining/dehydrating process. CONSTITUTION:This washing machine discharges tip water to the outside of the machine by a drain valve after the lapse of a prescribed time of a washing operation. Thereafter, rinsing is executed after dehydration. Such a series of washing works are executed by a microcomputer. In this regard, the quality of cloth is detected by rotating a stirring vane 7 positioned in a center part of a washing tank 3 forward and backward and finding a resistance variation applied to the stirring vane 7 from a counter electromotive force of a capacitor. Also, after a prescribed quantity of water is absorbed, the stirring vane 7 is turned by the same method as a first cloth quantity sensing, and the quality of cloth can be decided from resistance applied to the stirring vane 7. In such a way, in accordance with the quality of cloth of washing clothes, a stirring time limit before drainage and a stirring time limit in conformity with the quality of cloth are decided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control for reducing the prevention of a cloth piece shift in a fully automatic washing machine.

[0002]

2. Description of the Related Art In a conventional cloth deviation prevention operation, a stirring blade is rotated with a constant stirring time for a few seconds to a few minutes shorter than a washing time or a rinsing time, regardless of the washing water level or the amount of laundry to be washed. I am letting you. Therefore, by rotating the stirring blade regardless of the washing water level and the quality of the cloth, it is possible to prevent the deviation of the cloth at the time of washing in a specific cloth type (cloth quality), but if the cloth quality is different. The agitation water flow is strong, and the laundry clothes are pushed out to the side wall of the washing tub due to the agitation water flow, and the cloth is biased to the center of the washing tub. For this reason, if dehydration is performed in this state, the outer tank hits the outer frame and normal dehydration cannot be performed.

Further, in the past, since these water flows were controlled only by the amount of cloth, the agitation water flow was the same for cotton and for clothes of the chemical type, and the cloth that was biased during washing or rinsing was used. It could not be corrected, and a dehydration startup failure occurred during dehydration.

[0004]

The problem posed by the present invention is that the cloth is biased to one side after washing or rinsing after the washing or rinsing, regardless of the washing water flow, the amount of washing, and the kind of cloth. It must be controlled to prevent the above, and to make laundry clothes uniform before dehydration. During dehydration, by making the cloth uniform and dehydrating, noise, vibration, and
Dehydration startup failure can be prevented.

[0005]

Means for Solving the Problems The present invention is, as means for solving the above-mentioned problems, completed by washing or rinsing,
Before shifting to the drainage / dehydration process, stir with a water flow shorter than the stirring water flow for washing or rinsing for several seconds to several minutes. This agitation reversal time period changes the stirring water flow after washing and rinsing in accordance with the cloth quality of the laundry detected by the cloth quality sensor.

[0006]

Operation: Based on the information from the cloth quality sensor, the agitation water flow (time limit) after washing and rinsing is changed to correct the condition of the clothes that are biased during washing and rinsing, and then drainage-dewatering control is performed.

[0007]

The present invention will be described with reference to the drawings. Figure 1
It is a longitudinal section of a fully automatic washing machine which employs the present invention.

In the fully automatic washing machine, the outer tub 2 is supported by the four hanging bars 5 inside the outer frame 1 by the corner plates 21 at the upper four corners of the outer frame 1. The suspension bar 5 is provided with a push spring 4 that absorbs vibration during washing and dehydration. In the case of washing, the lid 18 is opened, the clothes are put into the washing tub 3, and the water is supplied in accordance with the command from the control unit 19, and then the motor 20 is rotated in the forward and reverse directions. The rotation of the motor 20 is transmitted from the motor pulley 17 to the clutch pulley 15 in the clutch 14 via the V belt 16. By the operation of the clutch 14, the transmitted rotation rotates the stirring blade 7 that moves the clothes located in the central portion of the washing tub 3 during the washing for washing.

During drainage, the motor 2 is instructed by the controller 19
0 is stopped, the drain valve 12 is opened, and the washing or rinsing liquid in the washing tub 3 is discharged from the drain hose 13 to the outside of the machine. After the drainage, the dehydration process automatically proceeds, but since the outer tub 2 swings largely due to the uneven state of the clothes, a balancer 6 is provided above the washing tub 3 to prevent the outer tub 2 from swinging. , It prevents the outer tank from shaking due to dehydration.

For dehydration, the rotation of the motor 20 is transmitted to the clutch 14 via the V-belt 16 as in the case of washing, and the washing tub 3 is rotated at a high speed by the control of the clutch 14 and the centrifugal force is applied to the clothes. The water inside is dehydrated to the outer tub 2 through the dehydration hole 3a provided in the washing machine 3. The dehydrated washing water is drained out of the machine from the drain valve 12 through the drain hose 13.

FIG. 2 is a detailed explanatory diagram of the control unit 19 described in FIG. The microcomputer 34 includes a timer 33 and a CPU
(Central processing unit) 32, memory 31, and I / O ports 29, 30. These microcomputer 3
The process of 4 is performed by the CPU 32, the timer 33, and the memory 31.
Are controlled by exchanging data via a data bus. As is well known, such operation control basically includes a timer 33, a central processing unit (CPU) 32, a memory 31, an input port 29, and an output port 30, and a control command at the time of washing is It is performed by a central processing unit (CPU), but the central processing unit (CPU) has an arithmetic unit and a control unit.
Become the center of the system. The CPU basically fetches, decodes, and executes instructions, but specifically, arithmetic and logical operations, read and write control of the contents of specified addresses in memory, and input / output to specified addresses in input / output devices. It controls output and program flow.

The memory 31 stores programs and data, and has both read and write functions.
And a ROM that has only a read function. The RAM is used as a work area for storing data and creating programs, and the ROM stores the fixed program and fixed data, and is always the same. It is used when processing.

The input port 29 and the output port 30 are CP
It is a circuit that acts as an intermediary when data is transferred between the U and the input device and the output device, and is generally called an I / O port.

An electric command from the fully automatic washing machine is input to the input side of the I / O port. This is mainly the power switch 23, the water level sensor 22, the lid switch 24, the program selection switch 25, the start / stop switch 2.
6, etc. are connected. Further, the washing motor 20, the water supply valve 10, the drain valve 12, the clutch solenoid 27, the alarm 28, etc. are connected to the output side, and the washing machine is controlled by the intervention of the I / O port by the instruction of the CPU. , Do a series of washing operations. The washing machine is therefore controlled in the same way as a mechanical control consisting of a cam switch.

The control of the fully automatic washing machine under microcomputer control has been described above with reference to FIG. 2. The operation under control of these microcomputers will be described more specifically with reference to the block diagram of FIG. In the washing machine, the power switch 23 is pressed, the program selection switch 25 is used to select, for example, a standard washing course, and the start / stop switch 26 is pressed to insert the water supply hose 11 from the water supply valve 10 into the washing tub. Water is supplied in 3. A specified amount of washing water, washing tub 3
By the information from the water level sensor 22,
The CPU 32 makes a judgment and starts a prescribed washing operation. After the washing operation is completed for the specified time, the drain valve discharges the water from the drain hose 13 to the outside of the machine. After that, the water in the clothes is dehydrated by the centrifugal force through the dehydration hole 3a, and then water for rinsing is supplied to perform rinsing. Such a series of washing operations is carried out by the microcomputer for washing.

Next, the principle of the cloth amount sensor for measuring the amount of cloth to be washed will be described with reference to FIG.

With respect to the amount of cloth, the motor 20 is operated by putting an appropriate laundry clothes in the washing tub 3, pressing the power switch 23, and pressing the start / stop switch 26. When the motor 20 is operated, a signal is alternately sent to the gates of the triacs 36a and 36b in response to a command from the microcomputer 34, so that the motor 20 rotates forward and backward. From the forward / reverse rotation of the motor 20, the stirring blade 7 located in the central portion of the washing tub 3 is moved forward / backward by the rotation transmission method described with reference to FIG. At this time, the resistance applied to the stirring blade 7 changes depending on whether the laundry clothes are large or small, and the degree of this change is detected by the counter electromotive force of the condenser 39.

The degree of change due to a series of these back electromotive forces will be described with reference to FIGS. 4 and 5. In FIGS. 4 and 5, the motor 20 sends an off command signal to the triac 36a in response to a command from the microcomputer 34. When released, the triac 36a shown in FIG.
It becomes like 3. At this time, the voltage across the terminals of the capacitor 39 is attenuated from the triac-off signal 43 in FIG. The attenuation voltage of the capacitor 39 is converted into a rectangular wave by the photo and triac coupler 37, and the inverter 40
The rectangular wave is inverted and the signal is sent to the microcomputer 34. The exchange of these pieces of information with the microcomputer is performed in the state shown in the cloth amount sensor 35 shown in FIG.

The signal which has a rectangular wave in the photo / triac coupler 37 and the inverter 40 shown in FIG. 4 enters a state similar to the sensing pulse 45 in FIG. 5 and enters the input port of the microcomputer 34, and the CPU 32 in the microcomputer 34. Is processed in. Here, whether the amount of cloth is large or small is determined by the forward / reverse rotation of the motor 20 and the change in Δt of the sensing pulse 45 shown in FIG. 5 due to the resistance of the cloth applied to the stirring blade 7. When the experimental result of this change amount is described based on FIG. 6, it can be seen that Δt of the sensing pulse 45 becomes longer in proportion to the load amount. Utilizing this state, when the sensing pulse 45 is taken in by the microcomputer 34, the microcomputer 34 changes the Δ of the sensing pulse 45.
tmsec is measured, and it is determined that the amount of laundry clothes is small and large, corresponding to the length of Δtmsec. According to this determination, the microcomputer 34 then determines the wash water level by selecting either a low water level or a water level that is set to medium, high, etc., and determines the water level from the water supply valve 10 into the washing tub 3. Supply.

The amount of water supplied is preset to the microcomputer 34.
Then, the water level corresponding to the amount of cloth is supplied.
The water level sensor 22 detects the water level set in 4.

As shown in FIG. 2, the microcomputer 34 continuously monitors whether or not the water level determined by the amount of cloth has been reached by the water level sensor 22 while supplying water from the water supply valve 10, and the signal from the water level sensor 22 is transmitted. When the signal is the same as that set in the microcomputer 34, the water supply valve 10 is stopped, the process proceeds to the washing step, and washing is performed.

Next, the cloth quality sensing will be described. The cloth quality sensing is to judge the quality of the cloth of the laundry and to control the washing under the conditions suitable for the quality of the cloth of the laundry such as the washing time and the washing water flow. The amount of cloth is sensed, the washing water level that matches the amount of cloth is determined, and water is supplied. After supplying water to the specified water level suitable for the amount of cloth, move the stirring blade 7 in the same way as when sensing with the amount of cloth, and at that time, the resistance added to the stirring blade 7 causes the same condenser as when sensing the amount of cloth. Measure the decay pulse time of. The decay pulse time at this time is Δt ₂ (msec). When judging the cloth quality, the damping pulse time Δt (msec) obtained by the first cloth amount sensing and the damping pulse time Δt ₂ (sensing pulse after sensing the cloth amount and supplying water to the specified water level that matches the load amount) msec) difference,
Judge the quality of laundry clothes.

After supplying a specified amount of water, the stirring blade 7 is rotated in the same manner as the first sensing of the amount of cloth, and the cloth quality can be judged by the resistance applied to the stirring blade 7. This means that when the quality of the cloth is, for example, chemical, the movement of the clothes in the washing tub 3 at the specified amount of water is weaker than that of cotton clothes. This is because, depending on the quality of the cloth, the chemicals contained in the cloth have a small water content and are easily floated on water, so that the resistance applied to the stirring blade 7 is reduced.

On the contrary, clothes having a high water content, such as cotton, contain a large amount of water, so that the clothes sink near the stirring blades 7,
The resistance applied to the stirring blade 7 increases. The quality of these cloths is used to detect the quality of the cloth to be washed.

Conventionally, after washing and rinsing, drainage and dehydration are performed, but when washing and rinsing, a relatively strong water flow is applied to remove stains on the clothes, and the clothes are finished in an unbalanced state and then dehydrated. As a result, the noise and vibration caused by dehydration become large. For this reason, the washing and rinsing are agitated for a few seconds or a few minutes after the rinsing and rinsing inversions are shorter than the reversal time to prevent the laundry clothes from being biased. However, regardless of the quality of the cloth, the reversal time to prevent the clothes from being biased was set at the same time, so even if it is effective for cotton-like clothes, it is great for clothes such as garment. The effect was not obtained. In the opposite case, it is not possible to use an agitated water flow to prevent the cloth from shifting to one side, which is suitable for the quality of the cloth, and during dehydration, the cloth is left in the tank 3 in an unbalanced state, resulting in noise and vibration. Often occurred. For this reason, as described above, the sensor is changed to a stirring time limit for washing the clothes depending on the quality of the cloth of the laundry and the rinsing end time (before drainage), and a stirring time period suitable for the quality of the cloth.

[0026]

According to the present invention, it is possible to carry out agitating for preventing the cloth pieces from slipping, which is suitable for the quality of the clothes of the laundry, and to prevent vibration and noise during dehydration and movement of the washing machine main body due to large vibration during dehydration. it can.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fully automatic washing machine.

FIG. 2 is a block diagram of microcomputer control.

FIG. 3 is a block diagram of a washing machine automatic rinsing course.

FIG. 4 is a cloth amount sensing circuit diagram.

FIG. 5 is a time chart of cloth amount sensing.

FIG. 6 is an explanatory diagram of an experiment result of a load amount and a cloth amount sensing pulse.

[Explanation of symbols]

 7 ... stirring blade, 35 ... cloth amount sensor.

Claims (2)

[Claims] 1. In a fully automatic washing machine, after washing or rinsing, the stirring blade is operated for a few seconds or a few minutes with a reversal time shorter than the washing water flow or the rinsing water flow, and the next drainage-dehydration process is automatically performed. Fully automatic, characterized by detecting the quality of the cloth detected by the sensor in the progressing control and performing the stirring blade for several seconds to several minutes at the reversing cycle corresponding to the quality of the cloth before draining after washing or rinsing Washing machine operation control method. 2. The operation control method for an automatic washing machine according to claim 1, wherein the reversing cycle of the stirring blades after washing and rinsing is changed according to the quality of the laundry clothes.