JPH0548717B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling the operation of a washing machine that performs washing by driving a washing and dehydrating tub in forward and reverse directions.

[Conventional technology]

Conventionally, two-tub washing machines that have both a washing mechanism and a dehydrating mechanism have a washing tub with rotary blades and a dehydrating tank adjacent to each other inside the outer box, and a dehydrating tank inside the dehydrating tank. Washing and rinsing are performed in the washing tub, and dehydration and, in some cases, rinsing are performed in the spin-drying tub.

By the way, current two-tub washing machines are becoming larger and can now wash a large amount of clothes at once in the washing tub, and the operating time limit, the shape of the rotor blades, the rotational force of the rotor blades, etc. Designed based on capacity. Therefore, when washing a small amount of clothes, even if the washing water used is kept to a low level, more water and thus detergent will still be used than necessary. In addition, because the rotation is too violent, there are problems such as damaging the clothing or causing it to lose its shape, and this tendency is particularly noticeable in the case of delicate fibers.

Therefore, for example, Japanese Patent Laid-Open No. 57
-A washing machine as shown in Publication No. 200187 was proposed.

Structurally, as shown in FIG. 7, as in the conventional case, a washing tub (not shown) having rotary blades and a dewatering tank 3 are provided adjacent to each other inside an outer box 1, and a dewatering tank 3 is provided adjacently. 3, a dehydration tank 7 is installed inside the bottom frame 2, and this dehydration tank 7 is connected by a dehydration shaft to a dehydration motor 5 installed in the bottom frame 2, and the motor 5 rotates. In particular, dewatering holes 9 were bored only in the upper part of the peripheral side wall. and,
The lower part is a completely closed gutter-like water storage part 7a without forming not only a dehydration hole but also a drainage hole, and a plurality of vertical blade bodies 8 reaching the bottom surface are arranged at appropriate intervals on the inner peripheral surface of this water storage part 7a. To protrude.

The blade body 8 may be attached as a separate body to the dehydration tank 7, or may be integrally molded with the dehydration tank 7.

Bolts 16 and nuts 17 are attached to the outer surface of the bottom of the dehydration tank 7.
A mounting bracket 18 is provided, and the dewatering shaft 6 is attached via this mounting bracket 18. 19 in the figure is a cover disposed inside the bottom of the dehydration tank 7, and the mounting bracket 18
4 is a drain hose provided at the bottom of the dewatering tank 3.

In addition, in the figure, 13 is a dehydration receiver cover provided at the top opening of the dehydration receiving tank 3, and 10 is a dehydration lid thereon, and the dehydration lid 10 is linked with an operating wire 15 of a brake mechanism 14 provided in the middle of the dehydration shaft 6. However, when the dewatering lid 10 is opened, a brake mechanism 14 is activated to stop the rotation of the dehydrating tank 7, thereby ensuring safety.

FIG. 8 shows a conventional electric circuit diagram for controlling the dehydration motor 5, in which the dehydration timer 36 of the energizing circuit for the dehydration motor 5 is of a cam type, and the contacts _T1 are a,
b and neutral point c, and this contact point T ₁ is connected to a, b,
By turning on or off to either position c, the dehydration tank 7 is divided into a case where the dehydration motor 5 rotates continuously and a case where it is intermittently driven. In the figure, numeral 37 indicates a lid switch that is operated by opening and closing the dehydration lid 10.

Next, a conventional method of washing and rinsing in such a two-tub washing machine will be explained.

The knob of the dehydration timer 36 has instructions divided into "washing/rinsing course" and "dehydrating/draining course".

When the amount of laundry is normal, washing and rinsing are performed in the washing tub, and dehydration rinsing or only dehydration is performed in the dehydration tub 7. In this case, if the operating knob of the timer 36 is set to the dehydration process shown in FIG. 6, the contact _T1 of the timer 36 closes to the side a, and the dehydration tank 7 is continuously rotated at high speed by the dehydration motor 5. As a result, rotational force is applied to the laundry, and water that is dehydrated by centrifugal force is discharged from the top opening of the second water tank 7 and the dehydration hole 9 to the dehydration receiving tank 3, and further passes through the drain hose 4. Drained outside the aircraft.
After the set time has elapsed, contact _T1 is located on the c side,
The power supply to the dehydration motor 5 is stopped, and the dehydration process is completed. Furthermore, when the dehydration lid 10 is opened during the dehydration process, the lid switch 37 is opened and the dehydration operation is stopped.

Next, a case will be described in which the amount of laundry is small and the washing is carried out in the spin-drying tub without using the washing tub.

First, open the dehydration lid 10, put the clothes in the dehydration tank 7, and turn the water supply switch (not shown) to the "dehydration tank side".
and move the water flow changeover switch (not shown) to supply water into the water storage section 7a of the dehydration tank 7. When the water reaches a predetermined level, the water supply is stopped and detergent is added.

Next, the knob of the dehydration timer 36 is set to the "wash/rinse course" of the program shown in FIG. 6, and the dehydration lid 10 is closed.

Now, the contact T ₁ of the timer 36 intermittently repeats the movement between a, b, and c at the preset time, and when the contact T ₁ is on the a side, the dewatering motor 5
rotates forward, when it is on the b side it rotates in reverse, and when it is on the c side it stops. In this way, the dehydration motor 5 is driven intermittently, and as a result, the dehydration tank 7 is also rotated by repeating forward rotation, stoppage, and reverse rotation, and the impeller body 8 in the dehydration tank 7 stirs the clothes and water to perform washing. be exposed.

When the set time has passed and the washing is finished, the process moves to the dehydration process, and the contact _T1 of the timer 36 is set to a.
side, and the dehydration motor 5 rotates forward. As a result, the dehydration tank 7 continuously rotates in one direction at high speed, and water is drained from the dehydration hole 9 at the top of the opening and the top of the side of the dehydration tank 7, and then further dewatering is performed.

Further, when rinsing is performed in the dehydration tank 7, the process is the same as the case of washing except that no detergent is added.

[Problem to be solved by the invention]

When washing and rinsing in a dehydration tank, the conventional forward/reverse control of the dehydration tank is performed only by the timer time, that is, the energization time. Fluctuations occur in the stirring rotational force applied to the laundry and washing liquid inside the tank, resulting in uneven washing and washing liquid flowing out of the tank, and in some cases, the inertial rotational speed of the dehydration tank is high. In some cases, the timer's timed operation could not control the rotation, making it impossible to reverse the rotation, resulting in intermittent rotation.

In order to prevent this inconvenience, it may be possible to design the output torque of the dewatering motor to be sufficiently larger than the required load torque, but this would not only result in a large dehydrating motor, but would also be expensive. Problems such as becoming

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide a washing machine operation control method that prevents uneven washing and outflow of washing liquid when washing and rinsing is performed in a dehydration tank, prevents continuous rotation of the dehydration tank in one direction, and ensures forward and reverse rotation. be.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a washing machine that performs washing by rotating a washing/dehydration tub that performs energized rotation and inertial rotation in forward and reverse directions using a motor, and is provided with means for detecting the rotational speed of the washing/dehydration tub. , the rotation of the washing and dehydrating tub is braked by energizing the motor so that it rotates in the opposite direction when a preset inertial rotation speed is reached during the inertial rotation of the washing and dehydrating tub; The gist of this system is to detect rotational speed, detect rotation in the reverse direction during braking of the washing and dehydration tank based on the change in speed, and detect reversal based on the detection result to control forward and reverse rotation of the washing and dehydration tank. It is.

[Effect]

According to the present invention, when washing and rinsing are performed by reversing the washing and dehydrating tub, when the forward or reverse rotation stops and becomes inertial rotation, the motor is energized to rotate in the reverse direction. When the washing and dehydrating tub is electrically braked, the rotation of the washing and dehydrating tub is slowed down, then stopped, and then starts rotating in the opposite direction. By detecting the speed change at this time using, for example, a speed generator as a means for detecting the rotational speed of the washing and dehydrating tank and detecting the reversal of the washing and dehydrating tank, forward/reverse reversal control can be performed reliably.

〔Example〕

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

FIG. 1 is a flowchart showing an embodiment of the washing machine operation control method of the present invention, FIG. 2 is a control block diagram, FIG. 3 is an output chart, and FIG. 4 is a waveform diagram of the rotation speed detection circuit. FIG. 5 is a longitudinal sectional front view showing one example of a washing machine used in the method of the present invention. First, the overall structure of the washing machine will be explained.

The washing machine shown in Figure 5 has the following components:
Components that are the same as those in the conventional example shown in FIG. Installed adjacently, and further dewatering tank 3
A washing/dehydration tank 7 (hereinafter referred to as a dehydration tank) is installed inside the washing machine.

This dehydration tank 7 had dehydration holes 9 formed only in the upper part of the peripheral side wall. The lower part is a completely closed gutter-like water storage part 7a without forming any dewatering holes or drainage holes, and a plurality of vertical blade bodies 8 reaching the bottom surface are arranged at appropriate intervals on the inner peripheral surface of this water storage part 7a. To protrude.

The blade body 8 may be attached as a separate body to the dehydration tank 7, or may be integrally molded with the dehydration tank 7.

A bolt 1 is attached to the outer surface of the bottom of this dehydration tank 7.
6. Provide a mounting bracket 18 with a nut 17, attach the dewatering shaft 6 via this mounting fixture 18, and attach the dehydrating shaft 6.
It is connected to the dewatering motor 5 installed in the bottom frame 2, and is driven to rotate at high speed by the rotation of the motor 5.

In the figure, 19 is a cover disposed inside the bottom of the dehydration tank 7, 13 is a dehydration receiving cover provided at the top opening of the dehydration receiving tank 3, and 10 is a dehydration lid thereon. Brake mechanism 1 installed in the middle
4 and an operating wire 15, and when the dehydration lid 10 is opened, a brake mechanism 14 is activated to stop the rotation of the dehydration tank 7, thereby ensuring safety.

Although not shown in the drawings, the water supply case of the water supply mechanism in the washing machine is also extended above the dehydration tank 7 so that water can be supplied therein.

In the present invention, in the washing machine having such a configuration, a coil 20a and a magnet 2 are further provided on the opposite load side of the dehydration motor 5 as means for detecting the rotational speed of the dehydration tank 7.
A speed generator 20 consisting of a speed generator 0b and a speed generator 20 was installed, and the output of the speed generator 20 was introduced into a controller 21.

The controller 21 uses a microcomputer 27 as shown in the control block diagram of FIG.
Outputs from a power supply 28, an operation switch 31 attached to the operation panel of the washing machine, other sensors 32 such as a water level sensor, and a lid switch 37 that operates when the dehydration lid 10 is opened or closed are introduced into the microcomputer 27, and An amplifier 3 that includes an output from the computer 27, a display 29 that displays the progress of the process, and a drive circuit that controls the dehydration motor 5.
It was introduced in 0.

In addition, the speed generator generated voltage 34, which is a sine waveform as shown in FIG.
3. Waveform shaping voltage 3 which is a 5V square wave via capacitor 24, transistor 25, and resistor B26
5 and introduces the period T into the microcomputer 27.

Next, the operation control method of the present invention will be explained with reference to the flowchart of FIG.

When the amount of laundry is normal, washing and rinsing are performed in the washing tub as in the past, and dehydration rinsing or only dehydration is performed in the dehydration tub 7.

When the amount of laundry is small, the dehydration tank 7 of a two-tub washing machine is used to wash the laundry, but first the dehydration lid 10 is
Open the machine, put the laundry in the spin-drying tank 7, add detergent, set the water supply switch (not shown) to the "spin-dry tank side," and supply water to the water storage section 7a of the spin-dry tank 7 until the specified water level is reached. When it reaches , stop the water supply [Step (a)],
For example, the operation switch 31 allows washing for 5 minutes,
Set dehydration (including drainage) for 1 minute [Step (B)].
After this, the flag (SONF) required for washing operation is automatically set.
=0, R&LF=1, PCUF=1, PLSCNT=
0) is set [step (c)].

Here, a method for calculating the number of rotations (speed) of the dehydration tank 7 will be explained. In the embodiment of the present invention, the speed generator 20 uses 36 poles, and when the dehydration motor 5 rotates once, the magnet 20b attached to the motor shaft rotates once and outputs 18 sine waves. The period T per sine wave of the speed generator 20 when it rotates at 100 revolutions/minute is calculated using the following formula: T = 1/f x 1/18 = 1/(100 x 1/60) ×1/18×1
000=33.3msec. In other words, if the microcomputer 27 detects this period T=33.3 msec, it is possible to determine the rotational speed of 100 revolutions/minute. Resistor A22, diode 23, capacitor 24, transistor 25,
Needless to say, the resistor B26 converts the sine wave into a 5V square wave.

By the way, in the judgment process of step (d)
Since PCUF is initially set to "1" in advance, the process moves to step (F). As shown in FIG. 3, when the waveform-shaped voltage (rectangular wave) 35 of FIG. 4 mentioned above is expressed as an energizing inertia pulse, it is "L" when the dehydration motor 5 is stopped. Therefore, it is not added to the energized inertial pulse counter (hereinafter referred to as PLSCNT) and the process moves to the next step. Here SONF=0, PLSCNT is 4
Below, since R & LF = 1, the dewatering motor 5
is energized so that it rotates in the forward direction [step (t)~
(li)〕.

When the dehydration motor 5 starts normal rotation, the energization/inertia pulse is output from the speed generator 20 as shown in FIG. 3, and the energization/inertia pulse changes from "L" to "H".
When it rises, it counts up PLSCNT [step (f)]. When PLSCNT reaches 4, it is assumed that the predetermined number of revolutions has been reached, and SONF is set to 1, and the power to the dehydration motor 5 is turned off [Step (N)].

Then, as SONF is set to 1, the process moves to step PLSCNT, where the PLSCNT counts up the inertia pulses generated by the rotation of the dewatering motor 5 due to inertia, and the count reaches 16. Then, assuming that the specified rotation speed has been reached, SONF=0,
Set PLSCNT = 0, PCUF = 0, R&LF = 0 [Steps (R) to (W)].

Since PCUF=0 is set here, the process moves to step (e) and the period T of the energization/inertia pulse is
comparison, that is, the current cycle Tn and the previous time (1 time ago)
Compare the period T _o-1 of . In this case, if T _o-1 > Tn, the rotation speed is increased, and if T _o-1 < Tn, the rotation speed is decelerated. In the present invention, during inertial rotation
When T _o-1 < Tn, PLSCNT = 0 and does not count up. On the other hand, now SONF=0,
Since PLSCNT=0 and R&LF=0, an electric brake is applied to the dewatering motor 5, which is energized in the reverse direction, to ensure rapid deceleration [step (re)]. When the rotation eventually stops and the dewatering motor 5 starts rotating in the opposite direction, the rotational speed increases in the reverse direction. Then, the period T becomes shorter, T _o-1 > Tn, and the step
In (e), when T _o-1 > Tn, PCUF=1,
PLSCNT is counted up [step
(f)〕. Then, by the dewatering motor 5 which was reversed,
When PLSCNT reaches 4, the reverse energization is turned off [step (N)], and the dehydration motor 5 rotates due to inertia in the same manner as described above, and the inertia pulses are counted up.

Next, when PLSCNT of the inertia pulse reaches 16, the dehydration motor 5 is energized to rotate in the forward direction in the same manner as described above, braking is applied, and the motor 5 decelerates and stops, and then starts rotating in the forward direction. start.

By repeating this operation, the dehydration tank 7 is also reversed, and the impeller 8 in the dehydration tank 7 stirs the clothes and water, and washing is carried out for 5 minutes [step (f)].

Once washing is complete, the process begins with dehydration (including drainage).
Then, the dewatering motor 5 is energized in the normal direction [step (Y)], and dehydration is performed for one minute [steps (T) (R)]. At this time, water is drained and dehydrated from the opening upper part of the dehydrating tank 7 and the dehydrating hole 9 at the upper side wall, as described above.

When rinsing is performed in the dehydration tank 7, it is the same as the case of washing except that no detergent is added.

In addition, when performing normal dehydration in the dehydration tank 7,
If only dehydration is set at the process set stage, dehydration will start from step (Y).

In the above embodiment, the speed generator 20 with 36 poles was used to detect the rotational speed, but the number of poles is not limited to this. It is also possible to use a photointerrupter, a Hall element, a reed switch, etc.

Further, although an example has been described in which the present invention is applied to the dehydration tank side of a two-tub type washing machine, it is also applicable to a fully automatic type washing machine.

〔Effect of the invention〕

As described above, in the washing machine operation control method of the present invention, when washing and rinsing are performed in the washing and dehydration tank, the forward and reverse rotation control of the dehydration tank is performed based on the rotation speed of the dehydration tank, Furthermore, when the dehydration tank reaches a preset rotational speed during rotation due to inertia, the dehydration motor is braked by applying electricity to the dehydration motor so that it rotates in the opposite direction, making it impossible to reverse the rotation speed. Intermittent rotation can be prevented and the next rotation in the opposite direction can be performed reliably and smoothly.

Furthermore, since the motor is stopped when a predetermined rotational speed is reached, uneven washing and washing liquid flowing out of the tank can be prevented even if there are fluctuations in the amount of laundry or the power supply voltage.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing an embodiment of the washing machine operation control method of the present invention, FIG. 2 is a control block diagram, FIG. 3 is an output chart, and FIG. 4 is a waveform diagram of the rotation speed detection circuit. FIG. 5 is a longitudinal sectional front view showing one example of a washing machine used in the method of the present invention, FIG. 6 is an explanatory diagram of the same operation as above, and FIG. 7 is a longitudinal sectional front view of a washing machine used in the conventional operation control method. FIG. 8 is an electric circuit diagram for controlling the dewatering motor same as above. 1...Outer box, 2...Bottom frame, 3...Dehydration tank, 4
...Drainage hose, 5...Dehydration tank motor, 6...
Dehydration shaft, 7... Dehydration tank, 7a... Water storage section, 8...
Blade body, 9... Dehydration hole, 10... Dehydration lid, 12
... Dehydration timer, 13 ... Dehydration receiver cover, 14
... Brake mechanism, 15 ... Operation wire, 16
... Bolt, 17 ... Nut, 18 ... Mounting bracket, 19 ... Cover, 20 ... Speed generator, 20
a...Coil, 20b...Magnet, 21...Controller, 22...Resistance A, 23...Diode, 24
...Capacitor, 25 ...Transistor, 26
...Resistor B, 27...Microcomputer,
28...Power source, 29...Display device, 30...Amplifier, 31...Operation switch section, 32...Sensor section, 34...Speed generator generated voltage, 35...Waveform shaping voltage, 36...Timer, 37... Lid switch.

Claims (1)

[Claims] 1. In a washing machine that performs washing by rotating a washing and dehydration tub that performs energized rotation and inertial rotation in forward and reverse directions using a motor, a means for detecting the rotational speed of the washing and dehydration tub is provided, and the inertial rotation of the washing and dehydration tub is At times, the rotation of the washing and dehydrating tub is braked by energizing the motor so that it rotates in the opposite direction when a preset inertial rotation speed is reached, and the rotation speed at this time is detected and the speed changes. 1. A method for controlling the operation of a washing machine, comprising: detecting rotation in a reverse direction during braking of a washing and dehydrating tub, detecting reversal based on the detection result, and controlling forward and reverse rotation of the washing and dehydrating tub.