JPH0549311B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a washing machine in which a rotor blade provided at the bottom of a washing tub is intermittently rotated from side to side at low speed and for short periods of time.

(b) Conventional technology These days, this type of washing machine has moved away from the conventional washing machine that rotates the rotor blades at high speed for a long time to achieve a high cleaning rate, and instead rotates the rotor blades at low speed and intermittently from side to side for a short time. This has given way to products that minimize damage to clothing. An example of the latter is, for example, JP-A-59-
This is disclosed in Japanese Patent No. 17390, and will be explained based on FIGS. 2 to 5.

Reference numeral 1 denotes a washing tub which also serves as a dehydration tank, and has a large number of dehydration holes 2 on its peripheral wall, and a balance ring 3 is attached to its mouth edge. A rotary blade 4 is disposed at the center of the bottom of the washing tub 1. Washing tub 1
is provided in the outer tub 5, and a drive mechanism 7 having a drive motor 6, a clutch, a brake device, etc. for rotating the washing tub 1 and the rotary blades 4 is attached to the bottom of the outer tub 5. It is suspended from the upper part of the machine frame 8 by a plurality of hanging rods 9 in a vibration-proof manner.

Therefore, the rotary blade 4 has a washing tub opening diameter of 60~
A circular base 10 with a large diameter that accounts for 80% of the base 10, a substantially triangular prism-shaped protrusion 11 that gradually protrudes from the periphery of the base 10 toward the center, and a base 10 that extends from each vertex of the triangle of this protrusion. It consists of a blade 12 protruding toward the periphery of the blade. Each feather 1
2 is deflected in a gentle curve toward the periphery of the base 10 in the same direction (rightward in the figure) as is clear from FIG. Height H of the protrusion 11
is determined to be approximately 1/2 of the outer diameter d of the circular base 10 and lower than the height h of the water surface of the washing tub 1. In the embodiment, the inner diameter D of the washing tub 1 =
For 400 [mm], the outer diameter d of the circular base 10 = 320
[mm], and the height H of the protrusion 11 is 140 [mm].

At the top of the protrusion 11, a substantially triangular prism 13 is formed at the top, the diameter of which is reduced by one step. As shown in FIG. 5, the slope (θ2) of the side surface of this triangular prism 13 is gentler than the slope (θ1) of the upper end of the side surface of the larger diameter triangular prism (the protrusion 11) below it. In the example, (θ2)=12° and (θ1)=8°. In the figure, reference numeral 14 denotes a boss that fits into the top of the blade shaft 15, and is inserted into a boss 16 provided on the back side of the top of the rotary blade. The rotor blade 4 is attached to the blade shaft 15 by tightening a mounting screw 17 to the top of the blade shaft 15.

The rotor blade 4 is rotated alternately left and right, and its rotational speed is 450 [rpm] to 720, which is the rotation speed of a conventional rotor blade.
[rpm], which is lower than 300 [rpm]. In the example, the speed is set at about 180 [rpm]. Then rotate to the right for 1 to 2 seconds, then 0.5 seconds to
A reversal cycle consisting of a collection of the same single period of stopping for 1 second and rotating to the left for 1 to 2 seconds is repeated during a set time. Moreover, even if the water level in the washing tub 1 becomes lower in the center in a conical shape as shown by the dotted chain line in FIG. ing.

In such a washing machine, when water is supplied to the washing tub 1 and the cloth C is put therein, and the rotary blade 4 is rotated, the lower part of the rotary blade 4 attempts to rotate the cloth in the horizontal direction in the same way as the conventionally used rotary blade. A water flow is generated, and the triangular prism-shaped surface of the protrusion 11 and the blades 12 in the upper part of the rotary blade apply a force to raise and lower the cloth. As a result, the cloth sinks along the side wall of the washing tub toward the rotor as shown by the arrow in FIG. Rotate.

In particular, since the three blades 12 of the rotor blade are deflected in a gentle curve in the same direction (toward the right) as shown in Figure 4, there is a difference in the water flow generated between the left and right rotations of the rotor blade 4. If you turn it clockwise, the water flow will be stronger and will lift the cloth upwards. This is because turning to the right applies a stronger force to the water, which causes the water to hit the wall of the washing tub more strongly and the reaction causes a flow of water that floats up. This results in vertical movement of the cloth.

Since the protrusion 11 is placed below the water surface, the cloth that has floated up can easily get over the protrusion 11, resulting in a large movement. At this time, since the protruding part 11 is not cylindrical but triangular prism-shaped, this protruding part also generates a water flow that tries to drive the cloth to the surroundings, thereby preventing the cloth from getting entangled in the protruding part.

Particularly in this case, since the apex substantially triangular prism 13 whose diameter is reduced by one step is formed at the top of the protrusion 11, the upper end of the protrusion 11 having a large diameter and the apex substantially triangular prism 13 having a small diameter can also be Turbulent flow is generated in the vicinity to make it even more difficult for the cloth to get entangled in this part, and the angle of inclination (θ1) of the upper end of the side surface of the protrusion 11 is less than the angle of inclination (θ2) of the side surface of the top approximately triangular prism 13. Therefore, it becomes easier for the cloth to climb over the rotor blade 4.

In this way, in the conventional example, clothes are less likely to get tangled during washing, so there is less damage to the cloth due to tangles, and since the rotational speed of the rotary blade 4 is low, there is less damage to the cloth.

In such a conventional example, the lower part of the rotor blade 4 rotates the clothing horizontally, and the upper part makes it float up and down,
As a whole, the clothes are moved vertically by a large amount, but since the rotation speed of the rotor blade 4 is very low and the rotation time is also short, it is difficult to move the clothes particularly up and down from the beginning of the set time. Therefore, the washing water penetrates slowly, the washing rate is not very high, and the clothes seem to move poorly to the user, giving the impression that they cannot be washed.

(c) Problems to be Solved by the Invention The present invention aims to increase the movement of the clothes from the beginning of the set time, thereby improving the apparent and substantial cleaning power.

(d) Means for Solving the Problems The present invention includes a rotating blade disposed at the bottom of the washing tub, a reversing cycle in which the rotary blade alternately rotates left and right at low speed, and this reversing cycle is performed for a set time. In a washing machine that repeats, the reversal cycle includes approximately five first single cycles having the same length of one direction rotation time and the other direction rotation time set within 2 seconds, and this first single cycle. Consists of one or two second single periods having the same period and having a rotation time in one direction of several seconds longer than the rotation time in one direction and a rotation time in the other direction shorter than the rotation time in the other direction. It is.

(e) Effect: In other words, if one-way rotation is performed for a long time while the clothes are constantly being turned over, a pulsating current similar to a swirling water flow will be generated, which will actively move the clothes and wash them with strong cleaning power. . This pulsating flow occurs at least once during the reversal cycle, and appears several times at appropriate times while the reversal cycle is repeated during the set time, thereby apparently and substantially improving the cleaning power.

(f) Example The basic shape of the washing machine according to the present invention is shown in Figs.
It is the same as the conventional example shown in the figure, and includes, for example, rotary blades and vanes of the same shape, a drive motor, and a drive mechanism, and the rotary blades are rotated in cycles stored in a microcomputer during the washing and rinsing processes. Specifically, at a rotation speed of approximately 180 rpm, it rotates intermittently from side to side for a maximum of 3 seconds with an appropriate rest period in between.

In the fully automatic course, water supply → washing,
The process of draining → intermediate dewatering → water supply → first rinsing → draining → intermediate dewatering → water supply → second rinsing → draining → final dewatering is executed, washing is performed within this process, and the rotor blade is washed during each of the first and second rinsing processes. is intermittently reversed. washing process, first rinsing process, second rinsing process and intermediate;
The time required for the final dehydration step can be freely set in advance. Also, during the rinsing process, water injection rinsing can be set at any time.

First, in the washing process, the reversal cycle shown in the time chart of FIG. 1A is repeatedly executed during a set time. That is, after the first single period of 1.2 seconds of clockwise rotation - 1.0 seconds of rest - 1.2 seconds of counterclockwise rotation - 1.0 seconds of rest,
Right rotation 2.4 seconds - Pause 0.5 seconds - Counterclockwise rotation 0.5 seconds - Pause 1.0
A reversal cycle with a second single period of seconds is repeatedly executed during a set time. Then, while washing is performed with less tangles and damage as in the past, washing with strong cleaning power is performed using a pulsating flow similar to a swirling water flow in the right direction, which inevitably increases the movement of the clothes and causes more damage. This results in a wash with less tangles and damage and greater apparent and substantial detergency.

In the reversal cycle shown in the time chart in Figure 1B, after the first single period is repeated five times, the second single period with a long clockwise rotation and the second single period with a long counterclockwise rotation are continued. There is. In this case, a pulsating flow similar to a rightward swirling water flow and a pulsating flow similar to a leftward swirling water flow are continuous, and the same rotational force is applied to the clothes from both the left and right sides, reducing the unevenness of the clothes and washing them unevenly. This suppresses the occurrence of

(g) Effects of the Invention According to the present invention, there are approximately five first single periods having the same length of one-way rotation time and the other-direction rotation time, and one-way rotation of several seconds longer than the one-way rotation time. It constitutes a reversal cycle that is repeated during a set time from one or two second single periods having a time, and therefore, it is possible to intermittently wash clothes in a weak water flow caused by constant and uniform left and right rotation. It can generate a strong pulsating flow similar to a unidirectional swirling water flow as if moving greatly, and can effectively add strong cleaning power intermittently while suppressing fabric tangling and fabric damage.It is high-performance and practical. We can provide washing machines.

Furthermore, in the second single period, the rotation time in one direction was made longer than that in the first single period, and the rotation time in the other direction was made shorter than that in the first single period, so that the pulsating flow in one direction was made stronger. It is possible to add stronger cleaning power intermittently.

Furthermore, since the periods of the first single period and the second single period are the same, there is no need to change the period count time for each single period during the reversal cycle, and it is possible to suppress control from becoming complicated. .

[Brief explanation of drawings]

1A and 1B are time charts of a reversing cycle in a washing machine according to an embodiment of the present invention, FIG. 2 is an overall vertical sectional view of a conventional example, FIG. Similarly, FIG. 5 is a plan view of the rotor blade, and FIG. 5 is a sectional view taken along the line A-OB in FIG. 4. 1... Dehydration/washing tub, 4... Rotating blade.

Claims (1)

[Claims] 1. In a washing machine that is equipped with a rotary blade at the bottom of the washing tub and is equipped with a reversal cycle in which the rotor blades are rotated alternately left and right at low speed, and this reversal cycle is repeated for a set time, the reversal cycle is 2 seconds. Approximately 5 first single periods having the same length of one-way rotation time and other-direction rotation time set within the same length, and the period is the same as this first single period and is longer than the one-way rotation time. A washing machine comprising one direction rotation time of several seconds and one or two second single cycles each having a second direction rotation time shorter than the other direction rotation time.