JPH0548716B2 - - 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, 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, 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. A dehydration tank 7 is installed inside the bottom frame 3, and this dehydration tank 7 is connected by a dehydration shaft to a dehydration motor 5 installed in the bottom frame 2, and is rotationally driven by the motor 5, but the structure of the dehydration tank 7 is 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 dewatering 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 tank 7. In this case, if the operating knob of the timer 36 is set to the dewatering 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 dehydrated by centrifugal force is discharged from the top opening of the dehydration layer 7 and the dehydration hole 9 to the dehydration receiving tank 3, and then passes through the drain hose 4. Water is drained out of the machine. 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 washing is performed in a dehydration tank without using a washing layer.

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 water 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 normal rotation, stoppage, and reverse rotation, and the impeller 8 in the dehydration tank 7 stirs the clothes and water to perform washing. .

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 holes 9 at the top of the opening and the top of the side of the dehydration layer 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 agitation rotational force applied to the laundry and washing liquid inside the tank, which not only causes uneven washing and washing liquid flowing out of the tank, but also increases the inertial rotational speed of the dehydration tank in some cases. 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 dehydration motor to be sufficiently larger than the required load torque, but this would not only make the dehydration motor large but also expensive. Problems such as:

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide an operation control method for a washing machine that prevents uneven washing and outflow of washing liquid when washing and rinsing in a dehydration tank, and enables smooth rotation of the dehydration tank.

[Means to solve the problem]

To achieve the above object, the present invention detects the rotational speed and rotation angle of the washing and dehydrating tub during energized rotation and inertial rotation in a washing machine that performs washing by rotating the washing and dehydrating tub forward and backward using a motor. The gist is to provide a means to turn the motor on and off and reverse the washing and dewatering tub when any one of the detected rotational speed, rotation angle, and energization/disconnection time reaches a specified value. It is something to do.

[Effect]

According to the present invention, when washing and rinsing are performed by reversing the washing and dehydration tank forward and backward, the rotation speed and rotation angle can be detected using, for example, a speed generator as means for detecting the rotation speed and rotation angle of the washing and dehydration layer. The rotation speed required for washing and rinsing, e.g. 200 rotations/min, the rotation angle e.g. 80°, or the preset energization time of 1 second has been reached. If so, the forward and reverse rotation of the motor will stop at this point. As a result, for example, when the voltage is high and the load is extremely small, the startup time of the motor is short and the rotational speed can be prevented from reaching 250 revolutions/minute before reaching 1 second.

In addition, even during inertial rotation when the power supply to the motor is stopped, the rotation angle of the dewatering pot is 240 degrees and the rotation speed is 10 seconds for a preset stop time of, for example, 1 second.
When one of the revolutions per minute is reached, the motor reverses its direction of rotation and rotates again, rotating the dewatering tank.
As a result, even if the dehydration lid is opened during the washing operation and the rotation of the dehydration tank is suddenly braked, the next rotation can be quickly carried out.

〔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 dehydration tank 7 is installed inside the tank.

This dehydration tank 7 had dehydration holes 9 formed only in the upper part of the peripheral side wall. The lower part is a gutter-shaped water storage part 7a that is safely closed without forming any dewatering holes or drainage holes, and a plurality of vertical blade bodies 8 that reach 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 20 is further provided on the opposite load side of the dehydration motor 5 as a means for detecting the rotation speed and rotation angle of the dehydration tank 7.
A speed generator 20 consisting of a magnet 20a and a magnet 20b 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.

Further, 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 the period T is converted to microcomputer 2.
7 will be introduced.

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 for washing, 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 part 7a of the spin-dry tank 7 until the predetermined water level is reached. When it reaches , stop the water supply [Step (a)],
For example, the washing 5
minutes, dehydration (including drainage) 1 minute. After this, flags required for washing operation (SONF=0 R&LF=
1) is automatically set [Step (B)].

Here, a method of calculating the number of rotations, that is, the rotation 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 dehydrating motor 5 rotates once, the magnet 20b attached to the motor shaft rotates once, outputting 18 sine waves, and the dehydrating tank 7, that is, the dehydrating motor 5 rotates once. The period T per sine wave of the speed generator 20 when rotating at 100 revolutions/minute is calculated using the following formula: T = 1/f x 1/18 = 1/(100 x 1/60) x 1/18×1000=33.3m
sec. In other words, if the microcomputer 27 detects this period T = 33.3 msec, the rotation speed
It is possible to judge 100 revolutions/minute. It goes without saying that the sine wave is converted into a 5V rectangular wave by the resistor A22, diode 23, capacitor 24, transistor 25, and resistor B26.

Regarding calculation of the rotation angle, when the dehydration motor 5 rotates once (360°), the speed generator 20 rotates at 18
Since it outputs a sine wave, its resolution is 360° ÷ 18 =
It becomes 20°. In other words, when the speed generator 20 outputs one sine wave, the dehydration motor 5 rotates by 20 degrees, and the dehydration tank 7 directly connected to it also rotates by the same angle of 20 degrees.

By the way, in step (c), SONF is initially set to 1, and at this time, the energization time to the dehydration motor 5, the rotation angle and rotation speed of the dehydration tank 7 are also set to the specified values of 1 second and 80°C. °, since it does not reach 200 revolutions/minute, it moves to the step (t) stage and R & LF
= 1, the dehydration motor 5 is energized and starts normal rotation.

When the dehydration motor 5 begins to rotate, a voltage is output from the speed generator 20, and the rectangular wave mentioned above is input to the microcomputer 27 as the energization pulse. Here, if the number of energization pulses is counted four times, the dehydration motor 5, that is, the dehydration tank 7
The rotation angle of is 80°. [Step (E)]. The period T between the pulses is also measured at the same time, and if the period corresponds to 200 revolutions/minute, [step (f)]
Also, if the energization time is a predetermined 1 second,
SONF becomes 1 and the rotation of the motor 5 stops. [Step (chi)]. In this way, when any one of the energization time, rotational speed, and rotational angle reaches a specified value, the rotation of the motor 5 is stopped at that point.

Now set SONF=1 and wash time 5
Since the minute has not yet passed, we return to step (c) and move on to step (i).Even during the inertia rotation of the dehydration tank 7, the power cut time is 1 second, the rotation angle is 240°, and the rotation speed is 10 rotations. /minute is detected.
SONF=0, R&LF=1or0 [Step(ri)~(wo)]
Make it. By setting SONF=0 and R&LF=1 or 0, the rotation direction of the motor 5 is reversed in step (W) to the opposite direction from the previous time, and the dehydration tank 7 is stirred.

By the way, the reversal operation of the dehydration tank 7 near the rated voltage and rated load is normally turned on when the rotation angle is 80°.
It is off at 240°, and the rotational speed of the dehydration tank 7 in this case is 100 revolutions/minute off and 95 revolutions/minute on, as shown in FIG. However, when the voltage is high and the load is extremely small, the motor 5 starts up quickly.
Since the speed sometimes reaches 250 rpm, it is configured to turn off at 200 rpm to avoid any operational problems such as washing liquid flowing out. Furthermore, the stop detection of 10 revolutions/minute during inertial rotation of the dewatering tank 7 is for protection when a brake operation is performed by opening the lid during washing operation. Furthermore, the washing operation can be performed even in the event of overload or sensor failure.

As described above, the dehydration tank 7 rotates forward and backward, 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.

Further, when performing normal dehydration in the dehydration tank 7, if only dehydration is set in the process setting stage, dehydration will start from step (Y).

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

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 dehydrating tub, the forward and reverse control of the washing and dehydrating tub is controlled not only by the power supply time to the motor but also by controlling the washing and dehydrating tub. Since it is based on the rotation speed and rotation angle of the water tank, it is possible to prevent fluctuations in the stirring rotational force due to differences in the amount of laundry or power supply voltage, etc., and as a result, uneven washing and washing liquid Prevents leakage outside the tank.

In addition, it does not become impossible to reverse, resulting in intermittent rotation on one side, and operates smoothly.

[Brief explanation of 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 an 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. Figure 8 is an electrical circuit diagram for controlling the dehydration motor. 1...Outer box, 2...Bottom frame, 3...Dehydration tank, 4
... Drainage hose, 5 ... Dehydration motor, 6 ... Dehydration shaft, 7 ... Dehydration tank, 7a ... Water storage section, 8 ... Impeller, 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, 20a...
...Coil, 20b...Magnet, 21...Controller, 2
2... Resistor A, 23... Diode, 24... Capacitor, 25... Transistor, 26... Resistor B, 27... Microcomputer, 28...
...Power supply, 29...Display unit, 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 reversing the washing and dehydrating tub forward and backward using a motor, a means is provided to detect the rotation speed and rotation angle of the washing and dehydrating tub during energized rotation and inertial rotation. A method for controlling the operation of a washing machine, characterized in that when any one of the rotational speed, the rotation angle, and the energization/disconnection time reaches a specified value, the motor is energized/disconnected, and the washing and dehydrating tub is reversed.