JP3734326B2 - Drum type electric washing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric washing machine .
[0002]
[Prior art]
In conventional electric washing machines , the laundry tub, which also functions as a dewatering tub, is rotated at a low speed to balance the laundry, and then the dehydration operation is finished in a state where the number of rotations is increased and dewatered in several stages. ing.
[0003]
[Problems to be solved by the invention]
However, in the above conventional electric washing machine , since the laundry is stuck to the inner peripheral surface of the washing tub, when the laundry is taken out from the washing tub after dehydration, the laundry is stretched on the inner surface of the washing tub. Because it remains attached, if you need a lot of power to take out the laundry, or if you forget to take out the laundry from the washing tub and leave it to dry, There was a problem to say.
[0004]
[Means for Solving the Problems]
The present invention has been invented to solve the above-described conventional problems, and the drum type electric washing machine of the present invention has a washing tub rotatably disposed in a water tub, and the washing tub varies depending on a drive motor. In a drum-type electric washing machine that is driven to rotate at a speed, the laundry tub is rotated left and right at a low speed after completion of the high-speed rotation dehydration operation by the high-speed rotation of the washing tub, and the rotation at this low speed is performed. Is divided into several steps, and the operation rate of the drive motor in each step increases as the step proceeds, and then the rotation of the washing tub is stopped at a low speed .
[0005]
According to such an electric washing machine, the laundry does not stick to the inner surface of the washing tub at the end of washing, so that the laundry can be taken out easily and even if the laundry is forgotten. , Can reduce the wrinkles of the laundry.
[0006]
Also, pre-Symbol sticking detection sensor for detecting the sticking of laundry is provided on the inner surface of the washing tub, to said sticking detection sensor detects the release from the washing tub interior surface of the laundry, at low speed of the washing tub Each step of rotation is repeated, and when the sticking detection sensor detects the separation of the laundry from the inner surface of the washing tub, the rotation of the laundry tub at a low speed is stopped .
[0007]
According to such an electric washing machine, the rotation of the washing tub is stopped when the laundry is peeled off by the sticking detection sensor detecting that the sticking of the laundry has been lost, so that the sticking of the laundry is automatically eliminated. be able to.
[0008]
Also, before Symbol sticking detection sensor is characterized by having a piezoelectric element.
[0009]
According to such an electric washing machine, the rotation of the washing tub is stopped when the laundry is peeled off by the sticking detection sensor having a piezoelectric element that detects that the laundry is no longer sticking. Can be eliminated automatically.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
[Constitution]
FIG. 1 shows a perspective perspective view of an electric washing machine provided with a cloth amount measuring apparatus according to the present invention. In the figure, 1 is a main body of an electric washing machine, 2 is a water tank disposed in the main body 1, 3 is a washing tank that also serves as a dewatering tank disposed so as to be horizontally rotatable in the water tank 2, and 4 is water for washing. Circulating pump for circulating excess water, 5 is a duct for circulating air and cooling water to react when drying, 6 is a fan motor for circulating the circulating air, 7 is a tap water supply port, 8 is a duct for circulating air, and 9 is circulating A drying heater that heats the air to dry the laundry, 10 is an inlet for detergent, softener, bleach, etc., 11 is a drainage pump, and 12 is the laundry stuck to the inner surface of the washing tub 3 It is a sticking detection sensor that detects whether or not.
[0015]
FIG. 2 shows the sticking detection sensor 12, and as is clear from this figure, the base 13 fixed to the inner surface of the washing tub 3 and the upper surface of the base 13 are fixed with one end 14a. At the same time, the engagement end 14c at the other end is inserted into the engagement port 13a provided at one end of the base 13, and the detection plate 14 having the weight accommodating portion 14b at the center is opposed to the weight accommodating portion 14b. A piezoelectric element 15 provided on the upper surface of the base 13, a weight 16 accommodated in the weight accommodating portion 14b and in contact with the piezoelectric element 15 via a protrusion 17, and provided in the weight accommodating portion 14b. It consists of a leaf spring 18 that presses the weight 16 toward the piezoelectric element 15 side. Reference numeral 14d denotes an engagement element which is formed at the tip of the engagement end portion 14c and prevents the engagement end portion 14c from coming off from the engagement port 13a.
[0016]
FIG. 3 is an electric circuit diagram showing the relationship between the piezoelectric element 15, the drive motor 19 that drives the washing tub 3, and the control circuit (microcomputer) 20. The output of the piezoelectric element 15 is controlled via the differential amplifier 21. The drive motor 20 is controlled by being supplied to the circuit 20.
[0017]
The present invention is configured as described above, and in this configuration, for washing, the laundry is put into the washing tub 3 and the lid (not shown) is closed, and then the detergent is softly put into the inlet 10. When a finishing agent, a bleaching agent or the like is added and the power switch is turned on, the washing tub 3 starts rotating, and at the same time, the tap water is supplied from the tap water supply port 7 and contains the detergent supplied to the input port 10. Then, the washing operation is performed by being supplied to the washing tub 3.
[0018]
During this washing operation, the wash water once used for washing is returned to the washing tub 3 again by the action of the circulation pump 4 and used again for washing. When the set time elapses and the washing is completed, the rotation of the washing tub 3 is stopped and the drainage pump 11 is started to drain the washing water.
[0019]
Next, when the rinsing process is started, after the washing tub 3 rotates and dewaters to some extent, tap water is supplied from the supply port 7 to perform rinsing. After such rinsing is performed a suitable number of times, the dehydration process is entered next. In this dehydration process, as shown in FIG. 5, the rotation speed (r.p.m.), time (sec), rotation direction and period (sec) of the washing tub 3 are controlled at each step, and the laundry is gradually washed. After dehydration, the laundry is added to the washing tub 3 by applying forward inversion of 35 to 60 rpm (55 rpm in this embodiment) to the washing tub 3 in particular as shown in steps 13 to 15. It can be peeled off from the washing tub 3.
[0020]
In these steps 13 to 15, the operation rate of the drive motor is increased as the step proceeds (step 13: reversal of 4 second rotation 12 second stop, step 14: reversal of 4 second rotation 4 second stop, step 15: This is the first step in order to create a point that triggers the peeling off of the laundry that is initially stuck to the inner surface of the washing tub 3. 13 to increase the stop time and let the laundry itself create a trigger point for peeling off due to its own gravity, then increase the operating rate of the drive motor and increase the impact force on the laundry as the step progresses The laundry is dropped from the inner surface of the washing tub 3 by enlarging the trigger.
[0021]
At the time of dehydration, when the sticking detection sensor 12 which is a feature of the present invention detects the sticking of the laundry on the inner surface of the washing tub 3, by repeating the steps after step 13 in FIG. Rotate until peeled from the inner surface of 3.
[0022]
The detection plate 14 has less vibration when the laundry is stuck on the inner surface of the washing tub 3, so that the weight 16 has little vertical movement and the voltage change in the piezoelectric element 15 is small. Is peeled off from the inner surface of the washing tub 3, the detection plate 14 is pressed and deformed by the rotation of the laundry in the washing tub 3, and pressure is applied to the piezoelectric element 15 through the leaf spring 18 and the protrusion 17. Therefore, since the voltage change of the piezoelectric element 15 becomes large, it is possible to detect whether the laundry is stuck.
[0023]
The output of the piezoelectric element 15 at this time is shown in FIG. 4. As is clear from this figure, when the laundry is stuck, the output is as small as about 0.2 mmv, but the laundry is not washed. When peeled off from the tank 3, it rises to 0.8 mmv. Therefore, in this embodiment, 0.5 mmv is used as the boundary value for whether or not the laundry is stuck, and when the output of the piezoelectric element 15 exceeds 0.5 mmv, it is detected that the laundry is peeled off from the washing tub 3 and the dehydrating operation is performed. Stop. That is, the washing machine is stopped.
[0024]
【The invention's effect】
According to the drum type electric washing machine of the present invention, the laundry does not stick to the inner surface of the washing tub at the end of the washing, so that the laundry can be easily taken out and the laundry is forgotten. Moreover, it is possible to reduce the wrinkles of the laundry.
[0025]
Further, by performing Thus to detect that the sticking detection sensor the rotation stop of the washing tub during washing濯物peeling was no longer sticking of the laundry, it is possible to eliminate the sticking of the laundry automatically.
[0026]
Further, by performing Thus to detect that the sticking detection sensor that a rotation stop with a piezoelectric element of the washing tub during washing濯物peeling was no longer sticking of the laundry, automatically eliminate the sticking of the laundry be able to.
[Brief description of the drawings]
FIG. 1 is a perspective perspective view of an electric washing machine embodying an embodiment of a dehydrating method according to the present invention.
FIG. 2 is a front cross-sectional view showing a sticking detection sensor provided to embody an embodiment of the dehydration method according to the present invention.
FIG. 3 is an electric circuit diagram showing a control circuit for controlling a drive motor by the sticking detection sensor.
FIG. 4 is a waveform diagram showing an output of the sticking detection sensor.
FIG. 5 is a diagram used for explaining a dehydrating operation according to the dehydrating method according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Water tank 3 Washing tank 12 Sticking detection sensor 15 Piezoelectric element 16 Weight

Claims (3)

In a drum type electric washing machine in which a washing tub is rotatably arranged in a water tub and is driven to rotate at different speeds by a drive motor, after completion of a high-speed rotation dehydration operation by high-speed rotation of the washing tub , then pivot to the right and left of the washing tub at a low speed, and dividing the rotation at the low speed in several steps, as the step progresses, after such operation rate of the drive motor in each step is high, the washing A drum type electric washing machine characterized in that the rotation of the tank at low speed is stopped . A sticking detection sensor for detecting the sticking of the laundry is provided on the inner surface of the washing tub, and each rotation of the washing tub at a low speed until the sticking detection sensor detects the separation of the laundry from the inner surface of the washing tub. 2. The drum according to claim 1, wherein the steps are repeated, and the rotation of the washing tub is stopped at a low speed when the sticking detection sensor detects the separation of the laundry from the inner surface of the washing tub. formula electric washing machine. The drum type electric washing machine according to claim 2, wherein the sticking detection sensor includes a piezoelectric element.

Images