JP3125362B2 - 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 fully automatic washing machine in which the amount of cloth is determined before supplying water to a washing and dewatering tub.

[0002]

2. Description of the Related Art In recent years, the mainstream of automatic washing machines that determine the amount of cloth in a washing and spin-drying tub and automatically set a water supply level, a water flow, a washing time, and the like according to the amount of cloth has become mainstream. .

Conventionally, a fully automatic washing machine of this type drives a pulsator on and off a plurality of times after water is supplied to a washing / dewatering tub up to a predetermined water level, and the number of revolutions of the motor is controlled by the back electromotive force of the motor when the pulsator is off. Detect and judge the amount of cloth in the washing and dewatering tub,
The water supply level, water flow, washing time, etc. according to the amount of cloth were automatically set.

[0004]

In such a conventional fully automatic washing machine, it takes one minute to two minutes from the start of operation to the determination of the amount of cloth, and the detergent must be supplied in advance according to the user's intuition. However, there is a problem that a detergent suitable for the amount of cloth cannot be added.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to determine the amount of cloth in a short time after the start of operation, and to be able to supply a detergent according to the amount of cloth.

[0006]

In order to achieve the above object, the present invention provides a motor for driving a pulsator rotatably disposed in a washing and dewatering tub, a rotation angle detecting means for detecting a rotation angle of the motor, A laundry amount determining unit that determines a laundry amount in the washing and dewatering tub based on an output of the rotation angle detecting unit; and a control unit that controls driving of the motor. to the water supply to the washing and dewatering tank
Usually short first predetermined time after <br/> driving than when washing the motor before, first to inertial rotation of the motor is substantially terminated
When performing a plurality of times an operation to pause between the second predetermined time T2, and that it has to determine the laundry weight by the number of output pulses of the rotation angle detecting means in the second predetermined time T2 as means for solving the problems.

[0007]

According to the present invention, the rotation amount of the pulsator after a short-time drive, that is, the output of the rotation angle detecting means during the idle period, has a high correlation with the cloth amount, and the rotation angle detection with high resolution is achieved by the above-mentioned means for solving the problems. 2 to 3
The amount of cloth can be detected with high accuracy by driving the pulsator for a very short time. Further, since the driving time of the pulsator is extremely short, even if the pulsator is driven without water, the amount of cloth can be determined without damaging the clothes.

[0008]

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

As shown in the figure, a washing and dewatering tub 1 has a pulsator 2 rotatably disposed at a central bottom. The water tub 3 contains the washing and dewatering tub 1 and the substrate 4 is fixed to the outer bottom, and a motor 5, a drain valve 6, a washing and dewatering switching mechanism 7, and the like are provided. The outer edge of the substrate 4 is suspended from the upper corner of the outer frame 10 via a vibration isolator 8 and a suspension rod 9. Outer frame 1
An upper cover 11 is provided at an 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 detection means) 15 detects the rotation angle of the motor 5, outputs six 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 for counting the number of output pulses of the encoder 15, a cloth amount determining unit 17 for determining a cloth amount based on an output of the pulse counter 16, a control unit 18 including a microcomputer, and a control unit 18.
Power switching means 19 for controlling the motor 5, the drain valve 6, the water supply valve 12 and the like in accordance with signals from the control unit 20, an operation display means 21 including a key switch and a display device arranged in an operation panel 20, and a water level detection means 22 , Storage means 2
3. It is composed of a dirt detecting means 24 and the like. Note that 25
Is an AC power supply, and 26 is a phase advance capacitor of the motor 5.

The operation of the above configuration will be described with reference to FIGS. 3 and 4. First, at step 30 in FIG. 3, the laundry is put into the washing / dewatering tub 1 and the power switch 13 is turned on. When a start switch (not shown) of the display means 21 is pressed, the process proceeds to step 32, where the motor 5 is driven rightward for 0.3 seconds as shown in FIG.
After a pause of 2 seconds, drive left for 0.3 seconds and pause for 1.0 second.

Next, proceeding to step 33 in FIG. 3, the number of output pulses of the encoder 15 during the idle period of 1.0 second is counted by the pulse counter 16, and in step 34, the laundry amount (the amount of laundry) is determined by the laundry amount determining means 17. Is determined. That is, the number of pulses detected by the pulse counter 16 varies depending on the amount of cloth as shown in FIG. 4B, and the amount of cloth can be determined based on the number of detected pulses. In addition, in FIG.
(A) shows a case where the cloth amount is small, and a curve (b) shows a case where the cloth amount is large.

After the cloth amount is determined as described above, FIG.
To the step 35, the operation display means 21 displays the detergent amount and the water level corresponding to the cloth amount to inform the user, and the step 3
In step 6, water is supplied to a predetermined water level, and the flow advances to step 37 to start stirring.

It is needless to say that the water flow, the washing time, the number of times of rinsing, the dehydration time and the like after the determination of the cloth amount are controlled according to the cloth amount.

As is apparent from the above embodiments, according to the present invention, a motor for driving a pulsator rotatably disposed in a washing and dewatering tub, a rotation angle detecting means for detecting a rotation angle of the motor, A laundry amount determining unit that determines a laundry amount in the washing and dewatering tub based on an output of the rotation angle detecting unit; and a control unit that controls driving of the motor. to the water supply to the washing and dewatering tank
Usually short first predetermined time after <br/> driving than when washing the motor before, first to inertial rotation of the motor is substantially terminated
When performing a plurality of times an operation to pause between the second predetermined time T2, by determining the laundry weight by the number of output pulses of the rotation angle detecting means in the second predetermined time T2, the laundry amount in a short time after the start of operation Can be determined, and a detergent corresponding to the cloth amount can be charged. Further, since the driving time of the pulsator at the time of detecting the cloth amount is extremely short, the cloths are not damaged for detecting the cloth amount.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of the fully automatic washing machine.

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

FIGS. 4A and 4B are operation time charts of the fully automatic washing machine when determining the amount of cloth;

[Description of Signs] 1 Washing and dewatering tub 2 Pulsator 5 Motor 15 Encoder (rotation angle detecting means) 17 Cloth amount determining means 18 Control means

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Moriki Fukuda 1006 Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-61-222697 (JP, A) JP-A-61 -8096 (JP, A) JP-A-60-137387 (JP, A) JP-A-5-92096 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06F 33/02

Claims (1)

(57) [Claims] 1. A motor for driving a pulsator rotatably disposed in a washing and dewatering tub, rotation angle detecting means for detecting a rotation angle of the motor, and the washing and dewatering tub based on an output of the rotation angle detecting means. And a control means for controlling the driving of the motor.The cloth quantity determination means controls the motor before water is supplied to the washing and dewatering tub by the control means. First shorter than normal washing
After the predetermined time drive, the inertial rotation of the motor is almost finished.
Fully automatic washing machine configured to determine the amount of cloth based on the number of output pulses of the rotation angle detecting means during the second predetermined time T2 when the operation of pausing for the second predetermined time T2 until the second predetermined time T2 is performed a plurality of times. .