JPH0214788Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention is designed to stop the rotation of the dehydration tank using a control means and supply water sequentially when the washing/dehydration tank generates abnormal vibrations during the dehydration process. This invention relates to a fully automatic washing machine that executes an automatic unbalance correction program that rotates the rotor blades, drains water, and restarts rotation of the dehydration tank.

(b) Prior art This type of fully automatic washing machine is, for example,
This is shown in Publication No. 39889. In this conventional example, the rotor blades are intermittently reversed after water is supplied during an automatic correction program in order to eliminate the unbalanced load and unbalance of the laundry that causes abnormal vibrations. However, since this reversal loosening operation requires a large number of revolutions per rotation, the laundry is twisted in the opposite direction and hardened, making it difficult to correct imbalances.

(c) Problems to be solved by the invention This invention aims to improve the rotation of the rotor during the automatic correction program to improve the loosening effect and reliably correct the imbalance. be.

(d) Means for solving the problem The present invention solves the problem by making the rotation of the rotor blade intermittently less than one revolution, and by making this intermittent rotation continue even during subsequent drainage. Solve.

(E) Effect: When the laundry is rotated intermittently at one revolution or less, the laundry is shaken little by little, and the laundry that has piled up high is flattened. If you continue to do this from when the water level is sufficient until it drops to a low water level, not only will it take longer, but you will also be able to spread small items that tend to float and relatively light laundry evenly, so that the entire laundry will be in the tank. They are stacked almost uniformly and flat, reducing unbalanced loads.

(f) Example To explain the example based on the drawings, 1 is a frame on which the outer tank 2 is suspended in a vibration-proof manner (the hanging rod portion is not shown), and 3 is a frame rotatably arranged inside the outer tank 2. 4... is a dewatering hole bored in the peripheral wall of the washing tub 3, 5 is a balance ring, and 6 is a large diameter mountain rotatably arranged at the center of the bottom of the washing tub 3. It is a type of rotor blade. On the outer bottom surface of the outer tank 2, the rotary blade 6 is intermittently reversed at a low speed (about 180 rpm).
Further, a drive motor 7 and a bearing case 8 are provided for simultaneously rotating the rotary blade 6 and the washing tub 3 in one direction at high speed. Further, a drain port 9 for the washing tub 3 is provided on the bottom of the outer tank 2, and the drain port 9 is connected to a bellows-shaped drain hose 1 which can be raised and lowered via a drain valve 10 and a drain channel 11.
It is connected to 2. Reference numeral 13 denotes a solenoid that opens the drain valve 10 when energized, and when energized, operates a clutch device (not shown) to open the drive motor 7.
The rotation is transmitted to the rotary blade 6 and the washing tub 3, and the brake device (not shown) of the washing tub 3 is released. Reference numeral 14 denotes an overflow port provided in the outer tank 2, which communicates with the drainage channel 11 via an overflow hose 15.

16 is an upper lid that covers the upper opening of the washing tub 3;
7 is a water supply port connected to a water supply channel via an electromagnetic water supply valve 18.

19 is a control box, which includes a microcomputer (hereinafter referred to as microcomputer) 20 as a control means;
It is equipped with a control circuit shown in FIG. 2 which connects various output means and various input (setting) means, and the front panel includes a power switch knob 21 for operating the input (setting) means and a water level setting knob. 22, key for changing the process etc. 23..., start key 24
..., a stop key 25, a light emitting diode (hereinafter referred to as LED) serving as an operation display or status notification means.
26... is provided.

The detection signal of the liquid level switch 27 that detects the set water level of the washing tub 3, the detection signal of the safety switch 28 that is linked to the opening and closing of the top lid 16 and detects abnormal vibrations during spin-drying, and the reset signal of the reset circuit 29 are controlled by a microcomputer. 20 is input. 30 is a drive circuit for rotating the drive motor 7 clockwise, 31 is a drive circuit for rotating the drive motor 7 counterclockwise, and 32 is a buzzer as a notification means for notifying the user of various conditions. The operating mechanism of the safety switch 28 is located in the lower part of the control box 19 and in the frame 1,
When the upper cover 16 is opened and closed, it is in two positions corresponding to open and closed, but when abnormal vibration is detected, it is instantly turned off and immediately returned to on.

Next, the process will be explained based on FIG. 3. This fully automatic washing machine automatically executes a washing process, a first rinsing process, a second rinsing process, and a final dehydration process in this order. The dewatering process is performed as an intermediate dehydrating process at the beginning of the first and second rinsing processes, and after draining water and resetting the liquid level switch 27, the washing tub 3 and the rotary blade 6 are moved in the same direction at the same time. It consists of dehydration that is rotated at high speed.

First, the washing process starts with water supply, and when the liquid level switch 27 trips, the water supply is stopped and the rotary blades 6 are stopped for about 1 second and rotated intermittently, alternating left and right for about 2 seconds. Then, this washing by intermittent reversal is repeated for a set time.

The next first rinse step starts with intermediate dehydration.
Then, by supplying water and intermittently reversing the rotor blade 6 in the same reversal cycle as the washing process,
Execute water injection rinsing for the set time while continuing to rinse or water supply. The next second rinse step is the first
Since this process is exactly the same as the rinsing process, the explanation will be omitted.

Finally, the final dehydration process is executed to complete the fully automatic operation.

Here, in the above three dehydration processes, if the "loose operation" is started at the same time as the start of draining, and the time until the liquid level switch 27 is reset is set to 30 to 40 seconds, then the drain and "loose operation" are performed for only 20 to 30 seconds. "Driving" is also carried out. This "loosening operation" is to intermittently rotate or reverse the rotor blade 6 one rotation or less/one rotation time. In this embodiment, a reversal cycle is repeatedly executed in which left and right rotations are alternately performed at a time interval (T _po ) and a pause time (T _pff ) is interposed between rotations. For example, T _po =0.1
~0.3 seconds, T _pff =0.2 seconds. In addition, "loose driving"
The reason why is made shorter than the time until reset is that if the rotor blades 6 are rotated when the water level is very low, there is a risk that the laundry may be damaged by the rotational force.

Thus, in this "loosening operation", the twisted and hardened laundry is shaken little by little at the end of the washing (rinsing) process, and the laundry is flattened horizontally. At the beginning of drainage, the water level is high, so the relatively heavy laundry that has sunk near the rotor blade 6 is swayed, but as the water level falls, the oscillating force is better transmitted and dispersed horizontally. Power becomes stronger. The shaking force gradually acts stronger on small items and relatively light laundry items that tend to float, dispersing them horizontally and stacking them, and some of them also get into the laundry at the bottom. In this way, the laundry is piled up evenly around the entire circumference of the tub 3, reducing unbalanced loads. Further, during the shaking, lint and the like during washing are dispersed, mixed with the draining water, and discharged. Furthermore, the water draining time is shortened because the rotary blade 6 rotates even a little and the water drains easily.

Shortly after such "loosening operation" is completed, the liquid level switch 27 is reset, and in response to this reset signal, the microcomputer 20 rotates the tank 3 and the rotary blade 6 clockwise at high speed to execute centrifugal dehydration.

Due to the reduction in the unbalanced load, the occurrence of abnormal vibrations during the dewatering process is almost eliminated, but if abnormal vibrations should occur, the safety switch 28 detects this and inputs a detection signal to the microcomputer 20. Then, the microcomputer 20 causes the unbalance automatic correction program shown in FIG. 4 to be executed. That is, the first and second times the safety switch 28 is activated (OFF) due to abnormal vibration, the water supply valve 18 is opened each time to supply water to the washing tub 3 to a low water level, and the above-mentioned "relaxation operation" is performed.
Execute for approximately 30 seconds while the water level is maintained. After this, drainage starts, but it is a "loose operation".
Continue for another 10 seconds while the water level gradually decreases. The duration of this operation during drainage is determined in relation to the water supply to the washing tub 3, and in this case, since the water level is low, it is set to 10 seconds. In this way, when the drainage progresses and the liquid level switch 27 is reset, centrifugal dehydration is restarted.

Once the laundry is subjected to centrifugal force, it is biased toward the peripheral side of the tub 3 and becomes long in the vertical direction, making it difficult to unravel.
However, in this program, it is necessary to flatten the water, so the "loosening operation" is executed for a long time even before the water is drained. In particular, if the laundry is re-hydrated and operated with some buoyancy, the laundry will move more easily and will not be biased during operation. Then, in the subsequent combined operation during drainage, the laundry is piled up flat and substantially uniformly, reducing the unbalanced load, as described above.

In addition, if the abnormal vibration cannot be corrected and all switches 28 are activated (OFF) three times, the dehydration operation will be interrupted.
The buzzer 32 sounds intermittently to notify the user of an abnormality. This suspended state is canceled by a predetermined operation (operation of the stop key 25, etc.), and the operation is resumed by a subsequent operation of the start key 24.

By suppressing abnormal vibrations in the tub 3 and performing post-vibration processing in this way, the automation rate of washing is improved, washing time is no longer extended, and the spin speed is maintained to increase spin drying efficiency. By shortening the distance between the frame 1 and the outer tank 2, it is possible to reduce the size and increase the capacity.

(g) Effects of the invention According to the invention, during the unbalance automatic correction program, the laundry that is clumped toward the circumference due to centrifugal force is first broken up by shaking it in water where it is easy to move. During drainage, the rocking force is gradually and strongly transmitted to all the objects, including small objects, and distributed evenly, and by repeating this, it is possible to make the objects approximately uniform in the horizontal direction and reduce unbalanced loads. Therefore, it is possible to reliably eliminate the imbalance after abnormal vibrations, so that it is possible to provide a fully automatic washing machine that can be used with peace of mind without stopping the spin-drying operation.

[Brief explanation of the drawing]

Figure 1 is a front sectional view of the fully automatic washing machine according to the present invention, Figure 2 is a block diagram of the control circuit, Figure 3 is a flowchart showing the operation of the fully automatic washing machine, and Figure 4 is a subroutine for the dewatering process. This is a flowchart. 3...Washing/dehydration tank, 6...Rotary blade, 20...
Microcomputer (control means).

Claims (1)

[Scope of utility model registration request] When abnormal vibrations occur in the washing and dehydration tank during the dewatering process, the control means interrupts the rotation of the dehydration tank, sequentially supplies water, rotates the rotary blades, drains water, and resumes the rotation of the dehydration tank. The fully automatic washing machine is characterized in that the control means causes the rotor to rotate intermittently at one rotation or less, and continues to perform this intermittent rotation even during subsequent draining.