JPH0548715B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling the operation of a washing machine that allows not only rinsing but also washing of a small amount of clothes on the dehydrator side even in the case of a two-tub washing machine.

[Conventional technology]

Conventionally, two-tub washing machines that have both a washing mechanism and a dehydration mechanism have a washing tub with rotary blades and a dehydration receiving tank adjacent to each other inside the outer box, and a small space inside the dehydration receiving tank. Install a dehydration tank with holes,
Washing and rinsing are done in the washing tub, and dehydration is done in the dehydrating tub.

In addition, in recent years, it has been practiced to perform so-called water injection rinsing in a dehydration tank, in which water is injected from above during dehydration and detergent is discharged along with the dehydrated water.

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, even if the amount of washing water used is kept low when washing a small amount of clothing, more water and therefore 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, the applicant first filed Utility Application No. 160336 (filing date: October 20, 1988) and Japanese Patent Application No. 62-299380.
No. (filing date, November 27, 1986), the following washing machine dehydrator was proposed.

As shown in Fig. 5, a washing tank (not shown) having rotary blades and a water receiving tank 3 are installed adjacent to each other inside the outer box 1, and the following washing/washing/receiving tank is installed inside the water receiving tank 3. A dehydration tank 7 is provided.

This washing and dehydration tank 7 has a dehydration hole 9 only in the upper part of the surrounding 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.
A plurality of vertical blade bodies 8 extending up to the bottom surface were provided protruding from the inner peripheral surface of the water storage portion 7a at appropriate intervals.

The blade body 8 may be attached as a separate body to the washing/drying tub 7, or may be integrally formed with the washing/drying tub 7.

A mounting bracket 18 is provided on the outer surface of the bottom of the washing and dehydration tank 7 using bolts 16 and nuts 17.
Attach the dehydration shaft 6 which is connected to the dehydration motor 5 via the dehydration motor 5. In the figure, reference numeral 19 denotes a cover disposed inside the bottom of the washing and dehydrating tank 7, which covers the fixing plate 22 of the mounting bracket 18.

In the figure, 4 is a drain hose at the bottom of the tank 3, 13 is a dewatering cover provided at the top opening of the water receiving tank 3, and 10 is a dehydrating lid on top of the dehydrating cover, and the dehydrating lid 10 is a brake installed in the middle of the dehydrating shaft 6. Operation wire 1 of mechanism 14
5, when the dehydrating lid 10 is opened, a brake mechanism 14 is activated to stop the rotation of the washing/dehydrating tub 7, thereby ensuring safety.

A normal amount of laundry is washed and rinsed in the washing tub, and the washing/drying tub 7 is used for dewatering, rinsing, or only dewatering.

In this case, the washing and dehydrating tank 7 is continuously rotated in one direction at high speed by the dehydrating motor 5.

Then, rotational force is applied to the washing and dehydration tank 7, so dehydration is performed by centrifugal force, and the poured water is discharged from the top opening of the washing and dehydration tank 7 and the dehydration hole 9 to the dehydration receiving tank 3, and further It is disposed of outside the machine using the drain hose 4.

On the other hand, if the washing machine has a small capacity and you wish to wash the clothes without using the washing tub, first open the spin-drying lid 10, place the clothes in the washing/spin-drying tub 7, and then turn the water supply switch (not shown) into the Set the washing/dehydration tank 7 to the water tank side and move the water flow changeover switch (not shown) to supply water to the water storage section 7a of the washing/dehydration tank 7. When a predetermined water level is reached, the water supply is stopped and detergent is added.

Next, when the dehydration motor 5 is rotated forward and backward, the washing/dehydration tank 7 is also rotated intermittently or repeatedly in forward and reverse directions, and the blades 8 in this tank 7 agitate the clothes and water to wash the clothes. be exposed.

After the set time has passed and the washing is finished, if the washing and dehydrating tank 7 is continuously rotated in one direction, the water is drained from the upper opening of the washing and dehydrating tank 7 and the dehydrating hole 9 at the upper side wall. Further dehydration takes place.

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.

By the way, the washing and dehydration tank 7 shown in FIG.
In the conventional washing machine _with
a and b and neutral point (not closed to either) c
By tilting this contact point to any one of positions a, b, or c, the washing and dehydrating tub 7 can be rotated continuously or intermittently by the dehydrating motor 5. It depends on the case.
In the figure, numeral 37 indicates a lid switch that is activated by opening and closing the dehydration lid 10.

That is, when washing and rinsing a normal amount of laundry in the washing tub, and performing dehydration rinsing or only dehydration in the washing and dehydration tank 7, the operation knob of the timer 36 is set to the dehydration process shown in FIG. Then, contact _T1 of timer 36 closes to a,
The washing and dehydrating tank 7 is continuously rotated at high speed by the dehydrating motor 5.

After a certain period of time, contact T ₁ moves to position c,
The power supply to the dehydration motor 5 is stopped, and the dehydration process is completed. It goes without saying that when the dehydration lid 10 is opened, the lid switch 37 is closed and dehydration is stopped.

Next, the knob of the timer 36 is set to the "wash/rinse" program shown in FIG. 7, 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 the dehydration motor 5 is intermittently driven, and as a result, the washing/dehydration tank 7 is also intermittently driven. It is rotated and washed.

When the washing is completed after the set time has elapsed, the process moves to the dehydration process, the contact _T1 of the timer 36 is closed to a, the dehydration motor 5 rotates forward, and the washing and dehydration tank 7
is continuously rotated to perform drainage and dewatering.

[Problem to be solved by the invention]

If the rotation of the washing and dehydrating tub 7 is controlled only by time-limited control using the cam timer 36, the amount of laundry and washing liquid in the washing and dehydrating tub 7 may vary due to differences in the amount of laundry to be washed, the power supply voltage, etc. Not only does this cause fluctuations in the stirring rotational force applied to the washing machine, causing uneven washing and outflow of the washing liquid, but also, especially when the inertial rotation speed of the washing and dehydrating tank 7 is high, the timed operation of the timer 36 cannot control the rotation and may not be able to reverse. On the other hand, there was a risk of intermittent rotation.

In addition, in order to prevent this, the output torque of the dewatering motor 5 must be designed to be sufficiently larger than the required load torque, resulting in problems such as not only an increase in size but also an increase in cost.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide an inexpensive washing machine which prevents washing liquid from flowing out of a washing and dewatering tank, has good cleaning performance, and is inexpensive.

[Means to solve the problem]

In order to achieve the above object, the present invention has a large number of dewatering holes drilled only in the upper part of the side wall, a completely closed water storage part in the lower part, and a vertical blade body protruding inward from the water storage part. In a washing machine that is equipped with a washing and dehydrating tub in a water receiving tank, the washing and dehydrating tub that performs energized rotation and inertial rotation is rotated in forward and reverse directions by a motor to perform washing, and the rotation speed of the washing and dehydrating tub is directly controlled. or a detection means for indirectly detecting, a discrimination means for discriminating whether the state is in an energized rotation state or an inertial rotation state, and based on the determination result of the discrimination means, if the state is in an energized rotation state, the detection means When the rotational speed detected by the detection means reaches a preset energized rotational speed, the power to the motor is cut off, and when the motor is in an inertial rotation state, the rotational speed detected by the detection means reaches a preset energized rotational speed. The gist of the present invention is to provide an energization/disconnection control means that energizes the motor and rotates the washing/washing tub in forward and reverse directions when the washing speed reaches the speed.

[Effect]

According to the present invention, the rotation of the drive motor of the washing and dehydrating tub is controlled according to the detection result of the rotational speed detection means, so that the washing and dehydrating tub may rotate at a speed higher than necessary due to the action of centrifugal force or the like. When the motor is about to rotate, the power to the motor is cut off to reduce the rotational speed, and when the rotational speed falls below a certain level, the motor is rotated in the opposite direction, resulting in smooth forward and reverse rotation with less influence of inertial rotation.

〔Example〕

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

FIG. 1 is an explanatory diagram showing one embodiment of the washing machine operation control method of the present invention, and FIG. 2 is a block circuit diagram of the same. In FIG. 1, the same reference numerals are given to the same components as in FIG. 5 showing the conventional example.

That is, as explained in FIG. 5, the washing machine used in the present invention has a washing tub (not shown) and a dewatering tank 3 adjacent to each other inside the outer box 1, and further has a washing tank (not shown) and a dewatering tank 3 inside the water receiving tank 3. Dehydration hole 9 only on the top of the surrounding side wall
The lower part has a completely closed gutter-like water storage part 7a with no dewatering hole or drainage hole formed, and a plurality of vertical blades 8 are provided on the inner peripheral surface of this water storage part 7a, reaching all the way to the bottom surface. Washing and dehydration tanks 7 are installed at appropriate intervals, and these washing and dehydration tanks 7 are attached to the bottom frame 2.
It is connected by a dewatering shaft 6 of a dehydrating motor 5 installed inside, and is driven to rotate at high speed by the rotation of the motor 5. The blade body 8 may be a separate body and may be integrally molded with the washing/drying tub 7.

The washing and dewatering tank 7 has a bolt 16 on the outer surface of the bottom.
A mounting fitting 18 was provided with a nut 17, and the dewatering shaft 6 was attached via this fitting 18. 19 in the figure is
This is a cover placed inside the bottom of the dehydration tank 7.

Although the above is the same as the conventional one, the present invention has a coil 20a on the opposite load side of the drive shaft of the dehydration motor 5, for example.
A speed generator 20 composed of a magnet 20b and a magnet 20b is provided as a means for detecting the rotational speed of the dewatering motor 5 and of the washing and dehydrating tank 7, and the output of the speed generator 20 is controlled by a microcomputer-based control device
The output of the control device 21 was introduced to the dewatering motor 5 via an amplifier 30.

As shown in FIG. 2, the speed generator 20 has a coil 20a connected to a diode 23, a capacitor 24, a transistor 25, and a resistor B26 via a resistor A22.
As shown in FIG. 3, the speed generator generated voltage waveform 34 generated by the coil 20a is shaped into a rectangular wave, and the control device 21 detects the period T of the rectangular wave to measure the rotation speed.

In FIG. 2, 28 is a power source, 29 is a display, 31 is an operation switch section, and 32 is another sensor section.

In accordance with the flowchart of FIG. 4, a case will be described in which a small amount of laundry is washed using the washing and dehydrating tub 7.

First, open the dehydration lid 10, put the laundry in the washing/dehydration tank 7, add detergent, set the water supply switch (not shown) to the "dehydration tank side", and set the water storage part 7a of the washing/dehydration tank 7. When the water reaches a predetermined water level, the water supply is stopped [step (a)], and the operating switch 31 is used to set, for example, 5 minutes of washing and 1 minute of dehydration (including drainage) [step (b)].

At this time, the flags required for washing operation (SONF=0,
It goes without saying that R&LF=1) is set.
Immediately after setting, SONF=0 [step (c)],
Since the dewatering motor 5 is not running, the rotation speed is also 0.
[Step (d)], and the flow is R&LF=
1 [step (E)], a signal is given from the control device 21 via the amplifier 30 to rotate the dewatering motor 5 in the normal rotation direction. If the washing time is within the set 5 minutes [Step (Re)], the rotation speed of the dehydration motor 5 is determined experimentally in advance.
The current is applied until it reaches 200r/m. When the speed exceeds 200 r/m, SONF is set and the power supply to the dewatering motor 5 is stopped [step (f)].

Next is the washing and dehydration tank 7, that is, the dehydration motor 5.
rotates due to inertia, which was determined experimentally in advance.
When it becomes 30r/m or less [step(t)], reset SONF, reset R&LF again [step(t)]
(H)], then the dewatering motor 5 is energized in the reverse rotation direction [Step (E)]. By repeating the above steps, the dewatering motor 5 is driven intermittently.
As a result, the washing and dehydrating tank 7 is also rotated in the forward and reverse directions, and the impeller 8 in the washing and dehydrating tank 7 agitates the clothes and water, so that washing is carried out for 5 minutes [step (re)].

As described above, the rotational speed of the dewatering motor 5 is detected to control the energization, and this is done in the following manner.

In the embodiment of the present invention, the speed generator 20 uses 32 poles, and when the dehydration motor 5 rotates once, the magnet 20b attached to the motor shaft rotates once, outputting 16 sine waves as shown in FIG. .

For example, when the washing and dehydrating tank 7, that is, the dehydrating motor 5 is rotating at 200 r/m, the speed generator 2
The period T per sine wave of 0 is calculated as follows.

T = 1/f x 1/16 = 1/200r/m x 1/60 x 1/16 x 1000msec = 18.75msec If the control device 21 monitors this cycle T = 18.75msec, the rotation speed will be 200r/m. It is possible to judge. Similarly, rotational speeds other than 30r/m can be detected.
Resistor A22, diode 23, capacitor 24,
A waveform shaping circuit including a transistor 25 and a resistor B26 converts it into a 5V rectangular wave.

Once washing is complete, the process begins with dehydration (including drainage).
Then, the dewatering motor 5 is energized in the normal rotation direction [Step (N)], dehydration is carried out for one minute, and ends after one minute [Step (R) (E)].

Water is drained and dehydrated from the opening of the washing and dehydrating tank 7 and the dehydrating hole 9 on the upper side wall, as in the conventional case. Further, when rinsing is performed in the washing/dehydration tank 7, the process is the same as the case of washing except that no detergent is added.

On the other hand, when performing normal dehydration in the washing and dehydration tank 7, if only dehydration is set in the process setting stage, dehydration will start from step (N).

In the above embodiment, the speed generator 20 with 32 poles was used to detect the rotational speed, but it is not necessary to be particular about this number of poles, and the rotational speed detection means can be configured using a photointerrupter, a Hall element, a reed switch, etc. It is also possible to do so. Further, a rotational speed detection means may be provided not on the drive shaft of the motor but on the dehydration shaft of the washing and dehydration tub to directly detect the rotational speed.

Further, although the case has been described in which a washing and dehydrating tank is provided on the dehydrating tank side of a two-tub type washing machine, the present invention can also be applied 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, a large number of dehydration holes are bored only in the upper part of the side wall,
The washing and dehydration tank has a water storage part whose lower part is completely closed, and a washing and dehydration tank having a vertical blade protruding inward from the water storage part in the water receiving tank, and which performs energized rotation and inertial rotation. In a washing machine that uses a motor to rotate forward and reverse rotations, the agitating rotational force that the washing and dehydrating tub exerts on the laundry and cleaning solution is due to differences in inertial rotational force caused by differences in the amount of laundry and differences in power supply voltage, etc. It is possible to prevent fluctuations in

As a result, the cleaning performance is improved, the outflow of the cleaning liquid can be prevented, and the drive motor can be small and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the washing machine operation control method of the present invention, FIG. 2 is a block circuit diagram of the same as the above, FIG. 3 is a waveform diagram for detecting rotation speed, and FIG. FIG. 5 is a partial longitudinal sectional side view of a washing machine according to the conventional example, FIG. 6 is an electric circuit diagram showing the conventional example, and FIG. 7 is an explanatory diagram of the operation of the conventional example. 1...Outer box, 2...Bottom frame, 3...Water tank, 4...
... Drainage hose, 5 ... Dehydration motor, 6 ... Dehydration shaft, 7 ... Washing and dehydration tank, 7a ... Water storage section, 8 ...
...Blade body, 9...Dehydration hole, 10...Dehydration lid, 1
3... Dehydration receiver cover, 14... Brake mechanism, 1
5... Operation wire, 16... Bolt, 17...
Nut, 18...Mounting bracket, 19...Cover, 2
0... Speed generator, 20a... Coil, 20b...
...Magnet, 21...Control device, 22...Resistance A, 2
3...Diode, 24...Capacitor, 25
... Transistor, 26 ... Resistor B, 28 ... Power supply, 29 ... Display, 30 ... Amplifier, 31 ...
Operation switch section, 32...Other sensor section, 34
Speed generator generated voltage waveform, 35... shaping voltage waveform, 36... timer, 37... lid switch.

Claims (1)

[Claims] 1. A washing/dehydration tank with a large number of dehydration holes drilled only in the upper part of the side wall, a completely closed water storage part in the lower part, and a vertical blade projecting inward from the water storage part is used as a water receiving tank. In a washing machine that performs washing by rotating the washing and dehydrating tub in the forward and reverse directions by a motor, the washing and dehydrating tub, which is provided with a energized rotation and inertial rotation, detects directly or indirectly the rotational speed of the washing and dehydrating tub. , a determining means for determining whether it is in an energized rotational state or in an inertial rotational state, and based on the determination result of this determining means, the rotational speed detected by the detection means is preset when the energized rotational state is present. When the energized rotational speed reaches a preset energized rotational speed, the motor is cut off, and when the rotational speed detected by the detection means reaches a preset inertial rotational speed when the motor is in an inertial rotational state, the motor is turned off. A method for controlling the operation of a washing machine, comprising a power supply/disconnection control means for supplying power and rotating a washing/washing tub in forward and reverse directions.