JPS58124484A - 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 The present invention relates to spin-drying time control of a washing machine using a photocoupler.

Conventional fully automatic washing machines spin water only for a preset period of time using a timer, so they have the disadvantage that they cannot spin water for a time that is appropriate for the amount of fabric and type of fabric, or when there is a large amount of fabric. The V1 dehydration rate is different for the same dehydration time when the dehydration time is the same, and as a result, there is a drawback that the dehydration is too much and wrinkles are formed, or the dehydration is insufficient.

In order to eliminate these drawbacks, two to three types of dehydration time can be selected using a switch provided on the operation unit, or the rotation of the dehydration tank is detected to control the dehydration rotation. In any of these cases, since the set time is controlled, there is a risk that excess or insufficient dehydration may occur. In particular, during dewatering, the cloth is lopsided and becomes unbalanced, and if dehydration is performed in this state, the rotational speed of the dehydration tank cannot be increased properly, resulting in poor dehydration.

The present invention eliminates the above-mentioned drawbacks of the conventional method in step 17 so that the drainage state during dehydration can be detected optically by a light receiving/emitting element, and step 41 can be performed during dehydration according to the dehydration state.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In Figure 1, which shows the schematic configuration of a fully automatic washing machine, 1 is the main body of the washing machine, 2 is an outer tank suspended from the main body 1, and 3 is an inner tank for washing and dehydrating clothes. is rotated by a motor 4 attached to the lower part of the outer tub 2, and a pulsator 6 is rotated by the motor 4 during washing and rinsing. 6 is a detector attached to the drainage path of the outer tank 2, and 7 is a drainage solenoid valve.

As shown in FIG. 2, the detector 6 has a light emitting element 8 made of an infrared light emitting diode and a light receiving element e made of a phototransistor facing each other. The structure is such that drainage liquid can freely pass between the two.

In FIG. 3, which shows a control circuit consisting of an A-D converter that converts the analog output of the detector 6 into digital, and a controller that performs status and sequence control, 10FiA-D
The converter has a function of converting the analog value of the output voltage v0 of the detector 6 into a digital value. 11 is clock section 1
1, this ladder-shaped D-A converter 12
The output vA of is generated stepwise as shown in FIG.

13 is the output v0 of the detector 16 and the ladder-shaped D-A converter 1
14 is an AND section,
15ij This is a control section that performs sequence control of the washing operation based on state detection, and is constituted by a microcomputer.

The R terminal of the control section 16 and the clock section 1 in FIG.
1 pulse output VB, output v0° of detector 6 comparator 1
The waveform diagram of the output VC of No. 3 and the output Vi of the AND section 14 is shown in FIG.

Next, the dehydration process will be explained with reference to FIG. 6, which shows changes in the output v0 of the detector 6.

When the dehydration operation starts, the inside W! 3 rotates, the water that has soaked into the cloth is centrifuged, and this separated water hits the first outer tank 2 and is then drained through the drainage path. When the amount of water being drained is large, the transmittance of the light emitting cord 8 is poor and the output voltage is low, but as the amount of drained lockstitch gradually decreases, the transmittance decreases. According to characteristic A, which shows the change when dehydration is performed, the output power ratio approaches the saturated state and becomes stable when the amount of water is small, or when dehydration occurs in cases such as chlorination. It can be seen that the water soaked in the water is dehydrated in a short time, so the dehydration time is short.

Also, according to characteristic B, which shows the change when a large amount of cloth or thick material is dehydrated, it can be seen that the dehydration time is long.

This control is performed by changing the output of the detector 6, and the output v of the detector 6 changes every predetermined period of time after the start of dehydration.

is measured, and the amount of change ΔV from the previous measurement value is calculated by the control unit 16.

Now, in FIG. 6, when measuring the output v0 of the detector 6, a pulse is output to the clock unit 11 which causes the R terminal of the control unit 16 to change from the stuffy level to the H level, and...
The output voltage vA of the A converter 12 increases each time this pulse is received.

And V. > Vp, the output VC of the comparator 13
becomes H level, and the output γj of the AND section 14 is ANDed with the pulse output VB, and is input to the input terminal AK of the control section 16 with the same waveform as the pulse output VB, and is counted.

Further, when v0≦vAK, the output vc of the comparison section 130 becomes L level, and the output Vi of the AND section 14 also becomes L level and is no longer counted.

In other words, the output V of the detection a6 is an analog voltage. is converted into the number of pulses, so the change in the measured value of the output v0 of the detector 6 becomes the difference between ΔvO#-i and the number of pulses, which is calculated in the control unit 16.

Then, the time when the amount of change Δvo in the detector 6 becomes equal to or less than the set value is detected, and the time from the start of dehydration to that time is measured and set as T. Note that in the case of the A characteristic in FIG. 5, it is T.

If the dehydration ends when this is detected, the dehydration rate tends to deteriorate, so it is safe to delay the dehydration operation for a certain period of time.In this case, if the delay time is defined as k (minutes), the dehydration rate will tend to deteriorate. Since there will be excess or deficiency in the result, it is necessary to change the delay time accordingly. , to: coefficient).

By changing the value of the coefficient depending on whether the measured time T is short or long, it is possible to obtain a detailed dehydration time according to the amount of cloth, the type of cloth, dehydration in an unbalanced state, etc.

For example, when T<1, D=T10, 2T, 1 (when T<2, D=T+0,5T, 2(T(when 3, D=T+1
It is preferable to set it as T.

Next, the specific numerical values will be explained with reference to FIG. 6, which shows the dehydration rate depending on the type of cloth.

0% property is obtained by dehydrating 1.6Kf of keratin, D characteristic is obtained by dehydrating 2.89% cotton, and point a is the change amount Δ of the detector 6.
When v0 becomes below the set value, point b indicates the point when dehydration is completed until the delay time. For C characteristics, the coefficient K is O, S, for C characteristics, the coefficient K is 1, and the delay time depends on the dehydration state. It can be seen that by changing the coefficient of , the appropriate dehydration time can be determined.

Therefore, a detector 6 that optically detects the state of the water in the dehydration process using a light receiving element 9 and a light emitting element 8 provided in the water drainage path, a control unit 15 that performs state and sequence control, and an analog output of the detector 6 are converted into digital data. A-D to convert
The output of the detector 6 is measured at regular intervals from the start of the dehydration operation according to a signal from the control unit 15, and the time until the difference from the previous output becomes equal to or less than the set value is measured. Since the coefficient is set according to the value of , and the operation is continued for a time equal to the coefficient times the measured time, good dehydration control can be performed without causing insufficient dehydration or excessive dehydration.

As described above, the present invention includes a detector that optically detects the drainage state, a control unit that performs state and sequence control,
Analog output of the above detector and A-D converted to digital
The dehydration time is the time when the difference between the output measurement value of the detector and the previous output measurement value at regular intervals from the start of dehydration operation is equal to or less than the set value, plus a predetermined times this time. This is of great industrial value as it provides a washing machine that can perform good dehydration depending on the type of cloth, the type of cloth, the dehydration rotation state, etc.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a fully automatic washing machine according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of a detector in the washing machine, Fig. 3 is a control circuit diagram including the detector, and Fig. 4 6 is a waveform diagram of each part in the same control circuit, FIG. 6 is an output characteristic diagram of the detector, and FIG. 6 is a relationship diagram between dehydration time and dehydration rate. 6...Detector, 10...A-D conversion unit, 16...Control unit. Name of agent: Patent attorney Toshio Nakao and 1 other name!
Figure 2

Claims (1)

[Claims] A detector that optically detects the state of drainage, a control unit that controls the state and sequence; 1. Equipped with an A-D converter that converts the analog output of the above-mentioned detector into digital, the system detects the time when the difference between the output measurement value of the detector and the previous output measurement value at regular intervals from the start of dehydration operation becomes less than the set value. A washing machine characterized by adding a predetermined time to this time as a spin-drying time.