JPS60106493A - Electric washer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric washing machine that washes clothes by forward and reverse rotational motion of stirring blades.

Conventional Structures and Problems Conventionally, a reversal type in which stirring blades are periodically rotated in forward and reverse directions has been mostly used. The reversal cycle is usually 2o-30
It has a constant cycle of forward rotation per second, pause for 5 seconds, and reverse rotation for 20 to 30 seconds.

Page 2 However, with this method, the fabric tends to tangle, and in the final stage of washing, the fabric tends to curl into a ball, causing uneven washing and local fabric damage, and the fabric is eccentric or unevenly distributed in the washing tub. There are cases. Therefore, fully automatic washing machines have the drawback of generating abnormal vibrations during the dewatering process.

In order to eliminate such drawbacks,
As seen in Japanese Patent Application No. 48, a method has been proposed in which the reversal period is shortened for a short period of time before the end of at least one of the washing and rinsing processes to correct uneven distribution of cloth.

However, since this method requires only a short time for the final step of washing, there are cases where the cloth is largely eccentric, and there are cases where it is not effective in alleviating the entanglement of the cloth.

In addition, recently, in order to alleviate cloth entanglement during washing, the reversal period of the stirring blades has been shortened, and a reversal period such as forward rotation for a few seconds, pause for 1 second, reverse rotation for several seconds, and pause for 1 second has been used.

However, with this method, at the initial stage of cleaning, the cloth does not absorb enough water, so it tends to float on the water surface, and the volume is large, so it is difficult to obtain a sufficient stirring effect. It had the disadvantage that the cleaning effect was inferior compared to that of the conventional method.

Purpose of the Invention The present invention aims to eliminate the above-mentioned drawbacks, and by changing the reversal cycle of the forward and reverse rotation drive of the motor as the cleaning time progresses, it prevents tangling and damage to the cloth and improves the cleaning effect. It provides an electric washing machine.

Structure of the Invention The electric washing machine of the present invention includes a stirring blade that washes clothes by forward and reverse rotation in a washing tub, a motor that drives the stirring blade, and a control device that controls the forward and reverse rotation period of this motor. As the cleaning time elapses, the control device shortens the reversal period of the motor and changes the reversal period of the stirring blades.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 1 is an outer frame, 2 is a washing tub for dehydration, and has stirring blades 3 inside. The peripheral wall of the washing tub 2 has many holes. 4 is an outer tank, which is suspended and supported by the outer frame 1 by a vibration isolating mechanism 10. Reference numeral 5 denotes a mechanical section that incorporates a speed reduction mechanism/brake and a washing/dehydrating switching clutch. 6 is a motor attached to the bottom of the outer tank 4, which includes a motor pulley 7, a belt 8. Power is transmitted to the washing tub 2 or the stirring blades 3 via the pulley 9.

FIG. 2 shows a block diagram of the circuit configuration of the electric washing machine described above. In this figure, 11 is an AC power supply, 12 is a power supply circuit for a control circuit, 13 is a controller that controls settings such as time limit settings and process order, and opening/closing of loads, and 14 is a control for setting the reversal cycle time under the control of the controller 13. The inversion cycle setting unit 1.15 increases the signal from the inversion cycle setting unit to drive the switching element 16, 16&, 16b is a switching element that controls the operation of the motor 6, and 17 is a drive circuit for driving the switching element 16. It shows a 6-vane two-dimensional capacitor for startup and operation. Then, the above-mentioned controller 131 inversion cycle setting section 14. The drive circuit 15 and the switching elements 16a and 16b form a control means 18 for controlling the reversal period of the shimotor 60.

FIG. 3 shows a time chart showing the open and close states of the switching elements 16a and 16b. In the human method, the stop time Ts1 of the motor 6 is constant, and the driving time ta for forward and reverse rotation is
The case where +tb is changed is shown. In method B, the total time T82 of the operating time and rest time of the motor 6 is constant;
This shows a case in which the motor is operated by changing the motor operating time and thereby changing the rest time.

The operation in the above configuration will be explained. Washing tub 2 in the washing process
When the water level in the washing tub 2 reaches a predetermined water level, the motor 6 starts to operate in forward and reverse directions, and the stirring blades 3 rotate in forward and reverse directions to start stirring. . At the beginning of washing, the clothes have absorbed enough water, so they float close to the water surface, making it difficult for the stirring action of the stirring blades 3 to be transmitted.
Also, the Page 6 detergent was not sufficiently dissolved. Therefore, at this point, the stirring period of the motor 6 is set to be relatively long. For example, the conventional reversal cycle of 1 to 3 seconds ON and 1 second OFF is changed to 3 to 6 seconds.
Stirring is performed with a reversal cycle of 1 second on and 1 second off, which agitates the clothes with a stronger agitation water flow than usual, speeding up water absorption, and speeding up the dissolution of detergent to create a uniform detergent solution, which improves the physics of detergent. Chemical action can be performed effectively. Even if the stirring force is increased at the beginning of washing, the clothes tend to float on the water surface, so there is little contact with the stirring blades 3, and there is relatively little damage to the clothes. Next, as the washing progresses, even if you shorten the inversion cycle and use the conventional agitation cycle of 1 to 3 seconds ON and 1 second OFF, the clothes will still absorb enough water to continue stirring. It is easy to clean, and the detergent concentration is uniform, so a sufficient cleaning effect can be obtained. Furthermore, in the later stages of cleaning, the cleaning effect becomes slightly less than before. Moreover, at this point, fabric tangles cause uneven washing and fabric damage, and in addition, in the post-washing process, in dual-tub washing machines, it is difficult to take out clothes due to tangled clothes, and in fully automatic washing machines, it is difficult to remove clothes. In the next dehydration process, uneven distribution of clothes can cause vibration noise and damage to the fabric.

Therefore, in the latter stage of cleaning, the reversal period is set to 0.3 to 1 second O.
N, by turning off the stirring blade 3 in small increments for 1 to several seconds and stirring by suppressing the rotation of the stirring blade 3 to within 1 rotation, an effect is created that spreads the clothes in the centrifugal direction, and at the same time, the clothes are loosened and the washing and dehydration tank 4 It will be evenly distributed within.

In this way, when the reversal period is changed during the cleaning process,
FIG. 4 shows the relationship between each washing time, cloth entanglement, and washing performance when the reversal period is kept constant as in the conventional method.

In FIG. 4, in the example (dotted line), the agitation force is made stronger than in the conventional example (solid line) at the initial stage of cleaning, so that cloth entanglement becomes stronger, but the cleaning performance is high in a short time. Next, in the middle stage of cleaning, since the example cleans with the same agitation force as the conventional example, it exhibits the same degree of change in cloth entanglement and cleaning performance. Finally, in the latter stages of cleaning, the agitation force is weakened to loosen the tangles of the cloth, so the tangles of the cloth become a little less, but at the same time no improvement in cleaning performance can be expected, so the cleaning performance reaches saturation.

Here, the reversal period in Fig. 3 is changed sequentially in proportion to the passage of cleaning time, but the reversal period is set to three or more stages, and the reversal period is made longer for the first few minutes of cleaning. In the intermediate period, even if the reversal period is shortened for several minutes in the latter half of the cleaning, similar effects can be obtained and the control means can be simplified. Furthermore, in the embodiments, a one-tank type washing machine was mainly described, but a two-tank type washing machine may also be used.

Effects of the Invention The electric washing machine of the present invention, as the washing process progresses,
By shortening the forward and reverse rotation period of the motor, it is possible to reduce cloth tangles, improve cleaning performance, and create a washing machine with less cloth damage. Furthermore, it has extremely great effects, such as improving workability and reducing vibrations in processes after the cleaning process.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a one-tub dehydrating 9-page washing machine showing an embodiment of the present invention, and FIG. 2 is a block diagram of the control circuit.
FIG. 3 is a time chart of the switching elements, and FIG. 4 is a diagram showing the relationship between cleaning time, cloth entanglement, and cleaning performance. 2... Washing tub, 3... Stirring blade, 6...
...Motor, 14...Reverse cycle setting section, 1
6... Drive circuit, 162L, 16b...
. . . switching element, 18 . . . control means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
-V8”/”:r! J 2 Figure @ 3 Figure A.

Claims (2)

[Claims] (1) A stirring blade that washes clothes by forward and reverse rotation in the washing tub, a motor that drives this stirring blade, and a shortening of the reversal period of the forward and reverse rotation of the motor as the washing time progresses. An electric washing machine comprising control means for: (2) The electric washing machine according to claim (1), wherein the rotation of the stirring blade is suppressed to one rotation or less during the latter stage of washing.