JPH05115669A - Full automatic washing machine - Google Patents

Abstract

PURPOSE:To make it possible to feed detergent corresponding to the quantity of cloth and improve cloth quantity-determining accuracy by determining the quantity of cloth in a short time after the start of operation. CONSTITUTION:Angle of rotation of a motor 5 for driving a pulsator disposed rotatably in a washing and hydro-extracting tank is detected by an encoder 15 to input its output into a cloth quantity-determining means 17 for determining the quantity of cloth in said tank. The means 17 determines the quantity of cloth based on the output of the encoder 15 from the beginning of stop period until a predetermined time T3 and the output of a temperature detecting means 25 after an action wherein the motor 5 is driven for a predetermined period T1 and then stopped for a predetermined period T2 by a control means 18 is repeated a plurality of times before water is fed into the tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully automatic washing machine in which the amount of cloth is determined before water is supplied to a washing / dehydrating tub.

[0002]

2. Description of the Related Art In recent years, full-automatic washing machines are mainly used to judge the amount of cloth in a washing / dehydrating tub and automatically set the water supply level, water flow, washing time, etc. according to the amount of cloth. ..

Conventionally, in this type of fully automatic washing machine, after supplying water to a washing / dehydrating tub up to a predetermined water level, a pulsator is turned on and off a plurality of times, and the number of revolutions of the motor is controlled by the back electromotive force of the motor when it is off. It detects and determines the amount of cloth in the washing and dehydration tank,
The water supply level, water flow, washing time, etc. were automatically set according to the amount of cloth.

[0004]

In such a conventional fully automatic washing machine, it takes 1 to 2 minutes from the start of operation to the determination of the amount of laundry, and the detergent needs to be put in advance by the intuition of the user. However, there is a problem that a detergent suitable for the amount of cloth cannot be added. Further, there is a problem in that correction cannot be performed against changes with time of the machine body, for example, changes in the tension of the belt between the motor and the pulsator with temperature, changes with time, fluctuations in power supply voltage, and the like.

An object of the present invention is to solve the above problems and to determine the amount of cloth in a short time after the start of operation so that a detergent corresponding to the amount of cloth can be added and the accuracy of judging the amount of cloth can be improved. I am trying.

[0006]

In order to achieve the above object, the present invention provides a motor for driving a pulsator rotatably arranged in a washing / dehydrating tub, and a rotation angle detecting means for detecting a rotation angle of the motor. A temperature detection means, a cloth amount determination means for determining the amount of cloth in the washing / dehydrating tub based on the output of the rotation angle detection means, and a control means for controlling the drive of the motor. The means is driven by the control means before the water is supplied to the washing / dehydrating tub, and after driving for a predetermined time T1 which is set to be equal to or longer than the time for the motor to rise to a predetermined rotation speed,
When the operation of pausing for a predetermined time T2 is performed a plurality of times, the amount of cloth is determined based on the output of the rotation angle detecting means from the beginning of the rest period to the predetermined time T3, and the cloth amount is determined based on the output of the temperature detecting means. The problem is solved by making a determination and correcting the cloth amount determination level by the output of the rotation angle detection means after the elapse of the predetermined time T3 and before the end of the rest period.

[0007]

According to the present invention, the amount of cloth can be determined by the outputs of the rotation angle detecting means and the temperature detecting means from the beginning of the rest period to the predetermined time T3 by the above means for solving the problem, and the rest period after the predetermined time T3 has elapsed. Belt tension and the like can be corrected by the output of the rotation angle detection means until the end, and the cloth amount determination accuracy can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in the figure, the washing / dehydrating tub 1 has a pulsator 2 rotatably arranged at the center bottom. The water tub 3 includes the washing / dehydrating tub 1 therein, and the substrate 4 is fixed to the outer bottom portion of the water tub 3, and the motor 5, the drain valve 6, the washing / dehydrating switching mechanism 7 and the like are arranged. The outer edge portion of the substrate 4 is suspended from the upper corners of the outer frame 10 via a vibration isolator 8 and a suspension rod 9. Outer frame 1
An upper cover 11 is provided on the upper part of 0, and a water supply valve 12, a power switch 13, a control device 14, and the like are provided. The encoder (rotation angle detecting means) 15 detects the rotation angle of the motor 5, outputs 6 pulses for each rotation of the motor 5, and inputs the output to the control device 14. The control device 14 includes a pulse counter 16 that counts the number of output pulses of the encoder 15, a cloth amount determination unit 17 that determines the cloth amount based on the output of the pulse counter 16, a control unit 18 including a microcomputer, and a control unit 18.
A power switching means 19 for controlling the motor 5, the drain valve 6, the water supply valve 12 and the like in response to a signal from the operation panel, an operation display means 21 including a key switch and a display device arranged in the operation panel 20, and a water level detection means 22. The storage means 23, the dirt detection means 24, the temperature detection means 25 for detecting the ambient temperature, and the like. In addition, 26 is an AC power supply,
27 is a phase advancing capacitor of the motor 5.

The operation of the above structure will be described with reference to FIGS. 3 to 6. First, in step 30 of FIG. 3, the laundry is put in the washing / dehydrating tub 1, the power switch 13 is turned on, and the operation is performed in step 31. When the start switch (not shown) of the display means 21 is pressed, the process proceeds to step 32, where the motor 5 is driven to the right for 0.1 seconds and rested for 0.3 seconds, and then 0.3 seconds (predetermined time T1). To drive. Then 1.5
After resting for a second (predetermined time T2), drive to the left for 0.1 second
After resting for 0.3 seconds, drive for 0.3 seconds (predetermined time T1), and then rest for 1.5 seconds (predetermined time T2). This operation is repeated multiple times. When driven for 0.3 seconds (predetermined time T1), the rotation speed of the motor 5 rises as shown in FIG. At this time, the rise of the rotation speed of the motor 5 depends on the power supply voltage, the amount of laundry, the tension of the belt 29, and the like.
The rotational speed of the motor 5 rises to a predetermined value during driving for 3 seconds (predetermined time T1).

Next, proceeding to step 33 in FIG. 3, the pulse counter 16 counts the number of output pulses of the encoder 15 from the beginning of the rest period to 0.4 seconds (predetermined time T3), and at step 34, the cloth amount judging means 17 Determines the amount of laundry (the amount of laundry). That is, the number of detection pulses of the pulse counter 16 varies depending on the amount of cloth as shown in FIG. 6B, and the amount of cloth can be determined by the number of detection pulses.
In Fig. 6 (b), the curve (a) has a small amount of cloth,
(B) shows the case where the amount of cloth is large.

On the other hand, the number of rotations of the motor 5, that is, the number of detection pulses of the pulse counter 16 is influenced by the tension of the belt 29 as described above. That is, FIG.
When the belt tension is low as shown in (c) (curve (C))
The number of detection pulses is large, and the number of detection pulses is small when the belt tension is large (curve (d)). Since the belt tension decreases as the washing machine body is used, the belt tension needs to be corrected to improve the cloth amount detection accuracy. The present inventors have found that there is a correlation between the number of detection pulses in the period (the predetermined period T4) after the elapse of the predetermined time T3 until the end of the rest period (the predetermined period T4), and by the number of detection pulses in the predetermined period T4 ( As shown in Table 1), the belt tension is determined.

[0013]

[Table 1]

Further, depending on the temperature of the place where the washing machine is installed,
Since the belt tension and the drive resistance of the washing / dehydration switching mechanism 7 are changed, as shown in FIG. 6 (d), when the temperature is high (curve
(E)) has many detection pulses and low temperature (curve)
(F)) has a smaller number of detection pulses. Even when the temperature of the place where the washing machine is installed is low, the number of detection pulses increases when the temperature of the drive system is rising when the washing machine is continuously operated. Therefore, in this embodiment, the control device 14 is provided with the thermistor temperature detection means 25 to detect the temperature of the installation location of the washing machine in consideration of the temperature rise of the power switching means 19 and the like.

When the cloth amount judging means 17 judges the cloth amount,
Correction is made based on the determined belt tension and temperature. That is, as shown in (Table 2), when the cloth amount is judged by the number of detection pulses in the predetermined period T3, the judgment level is shifted and corrected by the belt tension and the temperature. In addition, the determination level in (Table 2) indicates the water supply level according to the amount of cloth. For example, power supply frequency is 50Hz, temperature is 25
When the number of detection pulses at the predetermined time T3 is 50 and the number of detection pulses at the predetermined time T4 is 30 when operating at ℃, the belt tension is determined to be 300 g from (Table 1), and the cloth amount is From Table 2, it is determined to be "medium". Next, when the number of detection pulses at the predetermined time T3 is 50 and the number of detection pulses at the predetermined time T4 is 60, the belt tension is determined to be 100 g from (Table 1) and the amount of cloth is determined from (Table 2). Judge as "high".

[0016]

[Table 2]

After determining the amount of cloth as described above, FIG.
Step 35, the operation display means 21 displays the amount of detergent and the water level corresponding to the amount of cloth to notify the user, and Step 3
In step 6, water is supplied up to a predetermined water level, and the process proceeds to step 37 to start stirring.

Needless to say, the water flow, the washing time, the number of rinses, the dehydration time, etc., after determining the amount of cloth are controlled according to the amount of cloth.

[0019]

As is apparent from the above embodiments, according to the present invention, the motor for driving the pulsator rotatably arranged in the washing / dehydrating tub and the rotation angle detecting means for detecting the rotation angle of the motor. A temperature detection means, a cloth amount determination means for determining the amount of cloth in the washing / dehydrating tub based on the output of the rotation angle detection means, and a control means for controlling the drive of the motor. The means is paused when the control means drives the motor for a predetermined time T1 which is set to be equal to or longer than the time required for the motor to rise to a predetermined rotation speed before supplying water to the washing / dehydrating tub, and then pauses for a predetermined time T2 a plurality of times. The amount of cloth is determined based on the output of the rotation angle detecting means from the beginning of the period to the predetermined time T3 based on the output of the temperature detecting means, and the cloth amount is determined after the elapse of the predetermined time T3 until the end of the rest period. Since the cloth amount judgment level is corrected by the output of the turning angle detecting means, the cloth amount can be judged in a short time after the operation is started, and the detergent corresponding to the cloth amount can be added, and further, the temperature detecting means and the predetermined time T3. The belt tension and the like can be corrected by the output of the rotation angle detection means after the lapse of the rest period, and the cloth amount determination accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a fully automatic washing machine according to an embodiment of the present invention.

[Fig. 2] Vertical sectional view of the fully automatic washing machine

FIG. 3 is an operation flowchart of main parts of the fully automatic washing machine.

FIG. 4 is a voltage waveform diagram applied to a motor when determining the amount of laundry in the fully automatic washing machine.

FIG. 5 is a diagram showing the number of rotations of the motor when the cloth amount is detected in the fully automatic washing machine.

FIG. 6 is an operation time chart when the fully automatic washing machine detects the amount of cloth.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing / dehydrating tank 2 Pulsator 5 Motor 15 Encoder (rotation angle detection means) 17 Cloth amount determination means 18 Control means 25 Temperature detection means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazutoshi Adachi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A motor for driving a pulsator rotatably arranged in a washing / dehydrating tub, a rotation angle detecting means for detecting a rotation angle of the motor, a temperature detecting means, and an output of the rotation angle detecting means. The washing / dehydrating tub is provided with a cloth amount judging means for judging the amount of cloth in the washing / dehydrating tub, and a control means for controlling driving of the motor. The motor for a predetermined time T1
When the operation of pausing for a predetermined time T2 after driving is performed a plurality of times,
A fully automatic washing machine in which the amount of cloth is determined based on the output of the rotation angle detector from the beginning of the rest period to the predetermined time T3 based on the output of the temperature detector.