JPH1176675A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a washing degree while restricting cloth damage so as to shorten a washing time, etc., by providing a second period when a container- shaped stirring body is rotated forward and backward by means of a second reverse rotation cycle shorter than the reverse rotation cycle of the first period after the first period elapses in a non-hole washing tub. SOLUTION: The washing tub 7 is fixed at the time of washing and, in the meantime, the container-shaped stirring body 6 is rotated forward and backward. Thus, the wash thrown-in to the washing tub 7 with washing water is deformed and stirred so as to execute washing. At this time, the reverse rotation cycle is about two seconds so as to execute forward and backward rotation in a washing beginning period for about two minutes from a washing start. After that, forward and backward rotation is executed by the reverse rotation cycle of nearly 0.5 sec. in the period till the end of washing. Thus, high washing property is obtained so that the washing time is shortened. When an operation is contained only by the reverse rotation cycle being nearly 0.5 sec., a overflow water rate is increased a little but is almost fixed by nearly 1% irrespective of the washing time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine having a perforated washing tub and a container-like stirring body.

[0002]

2. Description of the Related Art Here, a perforated washing tub is a washing tub having a structure in which a dewatering hole is not provided on a peripheral wall surface for the purpose of saving water or the like. This washing tub has a structure in which a large number of holes for dehydration are provided on the wall surface.
A conventional washing machine constituted by a perforated washing tub is disclosed, for example, in Japanese Utility Model Publication No. 2-11018, in which a large-diameter bowl-shaped rotating tub is provided at the bottom of the washing tub. Then, the rotary tank is intermittently rotated.

[0003] In addition, as a configuration applicable to a washing machine having a perforated washing tub, there is a washing machine described in Japanese Patent Publication No. 2-55075. This conventional washing machine has a fixed peripheral wall portion fixed to the upper portion of the washing tub peripheral wall portion at the time of washing,
A movable peripheral wall portion located below the movable peripheral wall portion is provided, and the inner surface of the movable peripheral wall portion is configured to gradually increase in diameter from a lower portion to an upper portion, and the inner surface is formed in an uneven shape.

[0004]

Problems to be Solved by the Invention 2-11
According to the publication No. 018, the control during operation is "repeated the cycle of right rotation 2 seconds-pause 1 second-left rotation 2 seconds-pause 1 second". However, with the operation cycle time of 3 seconds, the rotating tank is not operated for 1/3 of the time, and there is a large loss time of the cleaning time.
Therefore, it takes a long time for washing.

On the other hand, Japanese Patent Publication No. 2-55075 discloses that
"The rotational speed of the container-like agitator is set within the range of 120 to 180 rotations per minute, and the rotation direction is reversed approximately every two to three rotations." When this is applied to a washing machine having a perforated washing tub, for example, the laundry has a rated capacity of 7 kg.
When the water is put in and the water volume is put in 40 liters, the water level reaches near the upper part of the washing tub.

At this time, the container-like agitator is, for example, 12 / min.
When the rotation is reversed every three rotations at 0 rotation, the container-like stirring body is reversed every 1.5 seconds, and the power transmitted from the container-like stirring body to the laundry is transmitted from the washing machine including the pulsator. The water in the washing tub flows out of the spin tub provided in the upper part of the washing tub due to the rise of the water level due to the centrifugal force.

In the case of a washing machine having a perforated washing tub, an outer tub is provided so as to surround the washing tub, and since the outer tub communicates with the washing tub, the water level in the washing tub is increased. However, in the case of a washing machine provided with a perforated washing tub, water in the washing tub flows out and the washing power is reduced. In addition, the lowering of the water level increases the damage to the laundry.

[0008] Further, when the container-like stirring body of this washing machine is inverted at 180 rotations per minute every two rotations, the inversion cycle is 0.67 seconds, and the rise of water due to centrifugal force is small. Since the power is insufficient, the laundry is less likely to be deformed and the cleaning power is reduced. For this reason, there is a problem that the cleaning of the rated capacity cannot be performed.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and has as its object to provide a washing machine having a perforated washing tub in which washing time is reduced by improving the degree of washing while suppressing damage to the cloth. With the goal.

[0010]

In order to achieve the above object, according to the present invention, in a washing machine provided with a container-like agitator at a lower portion inside a perforated washing tub, the container-like agitator is provided with a first inversion cycle. And a second period in which the container-shaped stirrer is normally rotated and inverted in a second period that is shorter than the first inversion period after a lapse of the first period. Are provided.

According to such a configuration, since the washing water is secured in the washing machine at the initial stage of washing, the washing machine can be operated with a long inversion cycle to improve the washing performance. After the elapse of the first period, the reversal cycle is shortened to suppress the outflow of the washing water from the washing tub so that the washing performance is not reduced. Can be shortened. Further, since the outflow of the washing water is suppressed, the damage to the cloth can be suppressed.

Further, in the present invention, in the above configuration, the first inversion cycle is 2 seconds, the first period is 2 minutes, and the second inversion cycle is 0.5 second.
Seconds. In this configuration, conditions are experimentally set as described later in order to appropriately obtain the above-described operation.

Further, according to the present invention, in a washing machine having a container-like agitator at a lower portion inside a perforated washing tub, the container-like agitator is removed by rotating the entire washing tub to dehydrate the laundry. Forward rotation and reverse rotation are performed at a predetermined reverse cycle.

According to such a configuration, the washing machine rotates the entire washing tub together with the container-like agitator at a high speed to dehydrate the water, and then, in the subsequent rinsing step, the reversal cycle such that the overflow does not become too large. In this case, the laundry stuck to the peripheral wall of the washing tub can be peeled off by rotating and reversing the container-like stirring body, and the laundry can be promptly stirred.

Further, according to the present invention, in a washing machine provided with a container-like agitator in the lower portion of a perforated washing tub, the container-like agitator is rotated forward and inverted during a washing step or a rinsing step. The rotation time at the time and the rotation time at the time of reversal have different periods.

According to such a configuration, in the washing step or the rinsing step, since at least the forward rotation time and the reverse rotation time have different periods, the exchange of the laundry is promoted, and the washing performance is improved. Shortening of time and suppression of cleaning unevenness or rinsing unevenness are performed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. FIG. 1 is a schematic configuration diagram of the washing machine of the present embodiment. Inside the washing machine, the outer tub 10 is suspended by a suspension rod (not shown). The motor 1 is attached to the bottom of the outer surface of the outer tub 10, and the driving force of the motor 1 is transmitted from the small pulley 2 to the large pulley 3 via the belt 8. Then, the power transmitted to the large pulley 3 is transmitted to the main shaft 4. The power transmitted to the main shaft 4 is transmitted to the container-like agitator 6 via the planetary gear 5 and is approximately 120 rp.
Rotate about m.

Inside the outer tub 10, there is provided a tapered washing tub 7 whose diameter decreases toward the bottom, and on the inner bottom of the washing tub 7, a tapered container shaped like the shape of the washing tub 7 is provided. A stirrer 6 is provided. The washing tub 7 is a washing tub without holes, and a rib 11 for reinforcement is provided on a peripheral wall portion thereof,
A balance weight 9 is attached to the rim.
A drain pipe 14 is attached to the bottom of the outer tub 10. The bar 13 is for preventing the laundry from sticking, and is mounted on the main shaft 4.

At the time of washing, the washing machine fixes the washing tub 7 and rotates the container-like agitator 6 forward and reverse. As a result, the laundry (not shown) put into the washing tub 7 together with the washing water is deformed and agitated, and washing is performed. At this time, as shown in FIG. 3, in the washing initial period T1 from the start of washing to about 2 minutes, the inversion cycle is 2 seconds, and normal rotation and inversion are performed. Thereafter, in a period T2 until the washing is completed, the time T.
Normal rotation and reversal are performed at a reversal cycle of 5 seconds.

The cleaning effect at this time will be described with reference to FIG. FIG. 4 is a characteristic diagram comparing cleaning ratios when the operation is performed only with the inversion cycle of 2 seconds and when the operation is performed only with the inversion cycle of 0.5 second. As shown in A, when the operation is performed with a reversal cycle of 2 seconds, the washing ratio sharply increases from the start of washing until 3 minutes,
After that, the increase in the washing ratio becomes slow.

On the other hand, in the operation with the reversal cycle of 0.5 seconds, as shown in B, it takes about 7 minutes to obtain the cleaning ratio of 0.8, but the improvement rate of the cleaning performance after that, that is, The gradient of the washing ratio is steeper than the gradient of the washing ratio after 3 minutes from the start of washing with a reversal cycle of 2 seconds, and it can be seen that the improvement rate of the washing performance is high. Therefore, the operation is performed at a reversal cycle of about 2 seconds until about 3 minutes from the start of the washing, and thereafter, since the high washing ratio of about 0.9 has already been obtained, the operation is performed until the washing is completed at a reversal cycle of 0.5 seconds. If this is the case, high washing performance can be obtained, so that the washing time can be reduced.

In this embodiment, the target cleaning ratio is 1.
0 or more. In this case, as can be seen from FIG. 3, if the operation is continued at the reversal cycle of 2 seconds, the washing can be completed in 5 minutes. However, when such an operation is performed, there is a problem that the amount of washing water is reduced due to the overflow and the buoyancy of the laundry is reduced, and the laundry is forcibly agitated by the container-like stirrer 6, thereby increasing the damage to the cloth.

In consideration of the above problems, in the present embodiment, the initial period T1 (see FIG. 3) in which the operation is performed at a reversal cycle of 2 seconds is set to about 2 minutes from the start of operation. This will be explained further. FIG. 5 is a characteristic diagram comparing the time change of the overflow rate when the operation is performed only with the inversion cycle of 2 seconds and when the operation is performed only with the inversion cycle of 0.5 second. The overflow rate is the amount of washing water that is supplied when washing laundry with the rated capacity as the denominator,
A rate expressed as a numerator of the amount of washing water leaked by washing. The overflow rate in FIG. 5 is not based on the cumulative amount of water that has flowed out, but indicates the overflow rate at that time.

If the operation is continued only with the inversion cycle of 2 seconds, A
As shown in the figure, the overflow rate increases with the washing time. On the other hand, when the operation is continued only with the reversal cycle of 0.5 seconds, as shown in B, the overflow rate is almost constant at about 1% regardless of the washing time, although there is a slight increase. Therefore, if the operation is continued at a reversal cycle of 2 seconds for 4 minutes or more from the start of washing, the overflow amount becomes 4% or more, and 1.6 liters of water is wasted. At times, since the amount of water is almost the limit of the amount that can be washed, it is impossible to secure the detergency due to the overflow. Also, fabric damage occurs.

FIG. 6 shows a comparison result of cloth damage between the operation according to the control according to the present embodiment (hereinafter abbreviated as “the main control”) and the case where the operation is performed only with the inversion cycle of 2 seconds. In FIG.
With the degree of fabric damage, the washing process is repeated 100 cycles, and the weight of the fabric before performing the cycle is used as the denominator,
The weight of the reduced cloth after the operation is used as a numerator. Since the degree of damage to the cloth is considered to increase in proportion to the washing time, the proportional relation is shown by a straight line as indicated by A and C, respectively. According to this, after 10 minutes, the cloth damage degree reaches 18% by the 2-second inversion control. On the other hand, in this control, it is 6%.

As can be seen from FIG. 6, the degree of fabric damage is significantly smaller in the present control than in the case of only the inversion cycle of 2 seconds.
The reason is that when controlled at a reversal cycle of 2 seconds, the washing water decreases due to the overflow and the washing water interposed between the laundry and the laundry decreases, so that the contact between the cloth and the cloth increases. Since the buoyancy is reduced and the load of the laundry is applied on the container-like agitator 6, the power of the container-like agitator 6 is transmitted to the laundry as it is, and the deformation of the cloth is less likely to occur, and This is because the laundry is rubbed more than necessary.

Therefore, by using this control,
Fabric damage can be suppressed. In addition, efficient washing can be performed. In this control, the washing time is about 8 minutes. If the damage to the laundry is not a problem, the washing time can be further reduced by operating the inversion cycle for 3 minutes or more and 2 seconds from the start of the washing, and the washing ratio of 1.0 can be achieved with the washing time of about 5 minutes. Obtainable.

Referring again to FIG. 1, after the above-described washing operation is completed, the washing machine drains water and spins the washing tub 7 and the container-like stirring body 6 in the same direction at a high speed to perform dehydration. At this time, the rotation speed was about 1000 rpm, and the moisture contained in the laundry reached the washing tub 7 by centrifugal force.
As shown in the figure, the washing tub 7 moves in the direction of the arrow along the gradient provided on the washing tub 7 having a holeless structure, and is discharged to the outer tub 10 through a dehydration port 12 provided on the periphery of the washing tub. You. At this time, the laundry is pressed against the washing tub 7 by a strong centrifugal force, and adheres to the wall surface of the dewatering tub 7 even after the dehydration is completed, so that the process proceeds to the next rinsing step as it is.

In the rinsing process, the washing machine fixes the washing tub 7 and rotates the container-like agitator 6 to rinse the laundry. When the laundry is shifted from the dehydration process to the rinsing process, the laundry is in contact with the wall surface of the washing tub 7, but a relative speed difference is provided between the container-like agitator 6 and the washing tub 7, thereby causing a shift in the rotation angle. Thus, the laundry comes off the wall of the washing tub 7. Further, by performing normal rotation and reversal of the container-shaped stirring body 6, the stirring of the laundry can be further promoted, and the rinsing can be performed efficiently.

Therefore, the rinsing is not continued while being stuck to the wall surface of the washing tub 7. In addition, even if a large amount of water does not accumulate in the washing tub 7, rinsing can be performed substantially immediately, and the total washing time can be reduced. At this time, the control of the container-like stirrer 6 is performed according to FIG.
In the same manner as shown in Fig. 7, the inversion may be performed every two seconds until about two minutes from the start of rinsing, and thereafter the operation may be performed until the rinsing is completed.

In a washing machine using a perforated washing tub, after dehydration by high-speed rotation, a portion of the laundry enters a dewatering hole provided on a side wall of the washing tub due to centrifugal force. In order to remove the laundry in the dehydration process because of strong adhesion to the wall surface, it is necessary to perform an operation of quickly repeating normal rotation and reversal in a short cycle. Since the adhesiveness to the wall surface of the laundry is weak because it is used, the laundry can be peeled off by reversing it at a reversal cycle of 2 seconds within a range where the overflow does not become a problem as in the control shown in FIG. ing.

Next, an example of a change in the normal rotation and the reverse control will be described with reference to FIG. In the control shown in FIG. 3, the rotation time during the normal rotation and the reverse rotation is operated at the same time. However, in this example, as shown in FIG. The rotation time during the normal rotation and the reversal is varied so that the rotation is performed for two seconds and then reversed for one second.

As a result, the rotational force of the laundry is unbalanced due to the interaction between the stirring state and the centrifugal force, and the unbalance causes the laundry to be replaced more than when the normal rotation and the reversal are performed at the same time. As a result, washing unevenness of the entire laundry can be suppressed. Similarly, even when this control is used for rinsing, uneven rinsing can be suppressed. In the period K2 from the initial period K1 to the end of the operation, the normal rotation and the reversal are switched at intervals of 0.5 seconds as shown in FIG. 7, but the time is changed so as to cause imbalance also in this case. Is also good.

Since the contact area between the container-like stirring member 6 and the laundry is larger than that of the washing machine constituted by the pulsator, the power of the container-like stirring member 6 can be efficiently transmitted to the laundry. Therefore, by simply making the times of normal rotation and reversal different, it is possible to provide an imbalance in the rotation of the laundry at that time. Therefore, for example, even if the normal rotation and the reversal operation times are set to be random, if there is no decrease in the washing water due to the overflow, the change of the laundry is sufficiently promoted.

On the other hand, in the case of a washing machine constituted by a pulsator, the power cannot be sufficiently transmitted, so that the above-mentioned imbalance may not be provided even if a simple time difference is provided. Therefore, for example, it is necessary to perform control to periodically change the operation time of the normal rotation.

As described above, the washing machine according to the present embodiment, as a washing machine having a perforated washing tub, has extremely excellent effects in improving washing performance and suppressing damage to cloth. Similarly, in a washing machine having no shaft 13,
This control has the effects of shortening the washing time and suppressing damage to the cloth.

As in the washing machine described in Japanese Utility Model Publication No. 2-11018, even if the washing machine has a configuration in which a large-diameter bowl-shaped rotating tub is provided at the bottom of the washing tub, the same control is performed by this control. The effect of can be obtained. The washing tub 7 is not limited to the tapered shape, and may have a shape in which the side wall extends vertically upward. Further, in this case, the stirring body may be tapered as shown in FIG.
As described in Japanese Patent Laid-Open Publication No. H10-209, a structure having a bottom surface portion and a side surface portion extending vertically upward along the side wall may be used. As described above, the “container-shaped stirrer” in the claims widely includes a rotatable stirrer having a large volume such as a large bowl and surrounding a laundry or the like at the bottom of the washing tub.

After dehydration after the washing step, the washing machine normally shifts to the rinsing step as described above, but a washing machine which does not perform the rinsing step but continues the washing step is also conceivable. Also in this case, the laundry is peeled off from the wall surface by adding the normal rotation and the reversing operation at the start of the second washing process, so that the washing effect can be substantially improved. In the operation control shown in FIGS. 3 and 7, a short operation stop period may be inserted when the rotation such as the reverse rotation from the normal rotation is reversed.

[0039]

As described above, according to the first aspect of the present invention, the washing cycle is increased by increasing the reversal cycle at the beginning of washing and shortening the reversal cycle after a certain period of time. The washing time can be reduced. In addition, since it also has the effect of suppressing the amount of overflow, it is possible to reduce cloth damage due to washing. Thus, the overflow of the washing water, which has been a problem in the washing machine having the perforated washing tub, can be solved. Further, in the invention according to claim 2, conditions are experimentally set so as to obtain optimum characteristics.

According to the third aspect of the present invention, when the washing tub is rotated to perform the dehydration of the laundry, and then the process proceeds to a process such as rinsing, the normal rotation and the reversing operation of the container-like stirring body are performed. By doing so, the laundry can be immediately stuck to the wall surface, so that a quick transition to a process such as rinsing can be performed, and the entire washing period can be shortened.

According to the fourth aspect of the invention, since the rotation time of the normal rotation is different from the rotation time of the reversal, the rotation is unbalanced when washing or rinsing the laundry. Since it is likely to occur, it is possible to suppress unevenness in washing and excessive unevenness.

[Brief description of the drawings]

FIG. 1 is a schematic view of a washing machine according to an embodiment of the present invention.

FIG. 2 is a structural diagram of the balance weight.

FIG. 3 is a timing chart of the control.

FIG. 4 is a characteristic diagram showing a temporal change of a cleaning ratio.

FIG. 5 is a characteristic diagram showing a temporal change of a flood rate.

FIG. 6 is a diagram comparing cloth damage due to control differences.

FIG. 7 is a timing chart showing a change example of the control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Small pulley 3 Large pulley 4 Main shaft 5 Planetary gear 6 Container-like stirring body 7 Washing tub 8 Belt 9 Balance weight 10 Outer tub 11 Rib 12 Dehydration port

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Chizuru Sakamoto 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka

Claims (4)

[Claims] 1. A washing machine provided with a container-like stirrer at a lower portion inside a perforated washing tub, wherein the container-like stirrer is rotated forward and reverse at a first reversal cycle for a first fixed period. After the first period has elapsed,
A second period in which the container-shaped stirrer is normally rotated and inverted in a second inversion cycle shorter than the inversion cycle of the washing machine. 2. The method of claim 1, wherein the first inversion cycle is 2 seconds, the first period is 2 minutes, and the second inversion cycle is 0.5 seconds. 2. The washing machine according to 1. 3. A washing machine provided with a container-like stirrer in a lower portion of a perforated washing tub, wherein the whole of the washing tub is rotated to dehydrate the laundry.
A washing machine characterized in that the container-shaped stirrer is rotated forward and reverse at a predetermined reversal cycle. 4. A washing machine provided with a container-like agitator at a lower portion inside a perforated washing tub, wherein the container-like agitator is rotated forward and reverse during a washing process or a rinsing process, and the rotation time during the normal rotation. And a rotation time during reversal.