JPH01284290A - Operation control method for washing machine - Google Patents

Abstract

PURPOSE:To prevent the occurrence of unevenness in washing and outflow of washing liquid, by a method wherein when either of a detected rotation speed and rotation angle and a set given connecting and disconnecting time attains a given value, disconnection of a dehydration motor is effected to rotate forward and reverse a washing and dehydrating drum. CONSTITUTION:A speed generator 20 formed with a coil 20a serving as a means to detect the rotation speed and the rotation angle of a dehydrating drum 7, and a magnet 20b is mounted to the antiload side of a dehydration motor 5, and an output from the speed generator 20 is introduced to a controller 21. When the dehydration motor 5 is started to run, a voltage is outputted from the speed generator 20, and a rectangular wave is inputted as an energizing pulse to a microcomputer 27. When either of an energizing time, a rotation speed, and a rotation angle attains a specified value, running of the motor 5 is stopped at that point of time, the running direction of the motor 5 is reversed to cause a dehydration drum 7 to perform an agitating motion.

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, a two-tub washing machine that has both a washing mechanism and a dehydrating mechanism has 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 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 to wash a small amount of clothing is kept to a low level, 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, as a washing machine that can not only rinse clothes but also wash small amounts of clothes on the dehydrator side, for example, Japanese Patent Laid-Open No. 57-20018
A washing machine as shown in Publication No. 7 was proposed.

Structurally, as shown in Figure 7, this is the same as before.
A washing tub with rotary blades inside the outer box (1) (not shown)
and a dewatering tank (3) are installed adjacent to each other.
3) Install a dehydration tank (7) inside the dehydration tank (7).
is connected to a dehydration motor (5) installed in the bottom frame (2) by a dehydration shaft, and is rotated by the motor (5). A dehydration hole (9) was made only in the upper part. 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 vertical blade body ( 8) are protruded from multiple rows at appropriate intervals.

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 mounting bracket (18) is provided on the outer surface of the bottom of the dehydration tank (7) using a pole I- (16) and a nut (17).
8) and attach the dehydration shaft (6). In the figure, (19) is a cover disposed inside the bottom of the dehydration tank (7), which covers the top of the neck l-(17) of the mounting bracket (18), and (4) is the cover disposed inside the bottom of the dehydration tank (7). ) is a drainage hose installed at the bottom of the tank.

In addition, in the figure, (13) is a dehydration receiver cover provided on the top opening of the dehydration receiving tank (3), and (10) is the dehydration lid above it, and the dehydration lid (10) is installed in the middle of the dehydration shaft (6). The brake mechanism (14) is connected to the operation wire (15) of the brake mechanism (14), and when the dehydration lid (10) is opened, the brake mechanism (14) is activated to stop the rotation of the dehydration tank (7) for safety. ing.

FIG. 8 shows a conventional electric circuit diagram for controlling the dehydration motor (5). The dehydration timer (36) in the energizing circuit for the dehydration motor (5) is a cam type, and the contacts T1 are a, b, and neutral. It has a point C, and this contact point T.

By turning on and off to any of positions a, b, and c, the dehydration tank (7) can be rotated continuously or intermittently by the dehydration motor (5). Divided. In the figure, (37) indicates a lid switch that is activated 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 you set the operation knob of the timer (36) to the dehydration process shown in FIG.
) is closed to the a side, 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 the dehydrated water is discharged from the top opening of the dehydration tank (7) and the dehydration hole (9) to the dehydration receiving tank (3), and further The water is drained out of the machine through the drain hose (4). When the set time has elapsed, contact T
, is located on the C side, and 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), set the water supply selector cock (not shown) to the "dehydration tank side", move the water flow selection switch (not shown), and then put the clothes in the dehydration tank (7). (7) When water is supplied into the water storage part (7a) and reaches a predetermined water level, the water supply is stopped and detergent is added.

Next, set the knob of the dehydration timer (36) to the "wash/rinse course" of the program shown in Figure 6, and then
Close the dehydration lid (10).

Now, the contact T1 of the timer (36) intermittently repeats the movement between a, b, and c at the preset time, and the contact T1
When 1 is on the a side, the dehydration motor (5) rotates normally, and b
When it is on the C side, it reverses, 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, stop, and reverse rotation, and the impeller (8) in the dehydration tank (7) is rotated between clothes and water. Washing is done by stirring.

When the set time has passed and the washing is finished, the process moves to the dehydration process, and the contact T of the timer (36) closes to the a side.
The dewatering motor (5) rotates normally. 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 dewatering is further 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.

(Problems to be Solved by the Invention) When washing and rinsing are performed in a spin-drying tank, the conventional forward/reverse control of the spin-drying tank is performed only by the timer time, that is, the energization time, so it is difficult to control the amount of laundry, power supply voltage, etc. Due to these differences, the agitation rotational force applied to the laundry and washing liquid in the spin-drying tank will fluctuate, resulting in uneven washing and washing liquid flowing out of the tank. If the inertial rotational speed was high, it could not be controlled by the timed operation of the timer, 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, and to provide a washing machine operation control method that prevents uneven washing and outflow of washing liquid when washing and rinsing in a dehydration tank, and allows smooth rotation of the dehydration tank. It is about providing.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a washing machine that performs washing by reversing the washing and dehydrating tub in forward and reverse directions. , the gist is that when any one of the rotation angle and the predetermined energization/disconnection time reaches a specified value, the dehydration motor is energized/disconnected and the washing and dehydration tub is reversed in the forward and reverse directions.

[Effect]

According to the present invention, the washing/dehydration tank can be reversed for washing and dehydration.
When rinsing is performed, the rotation speed and rotation angle of the washing and dehydrating tub are detected by, for example, a speed generator as a means for detecting the rotation speed and rotation angle, and the rotation speed required for washing and rinsing, for example, 200 rpm, is detected. When the motor reaches a specified value of minutes, rotation angle, for example, 80 degrees, or a preset energization time of 1 second, the forward and reverse rotation of the motor is stopped at this point. As a result, for example, when the voltage is high and the load is extremely small, the startup time of the dehydration motor is short (it is possible to prevent the rotation speed from reaching 250 revolutions/minute before it reaches 1 second).

Also, even during inertial rotation when the power supply to the motor is stopped, if the preset stop time is 1 second, the rotation angle of the dehydration tank reaches 240 degrees, and the rotation speed reaches 10 rotations/minute, The motor reverses the direction of rotation and rotates again, causing the dehydration tank to rotate.

As a result, even if the dehydrating lid is opened during the washing operation and the rotation of the dehydrating 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 diagram, 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.

Among the components of the washing machine shown in FIG. 5, those that are the same as those in the conventional example shown in FIG. ) is provided with a washing tub (not shown) and a dehydration tank (3) adjacent to each other, and a dehydration tank (7) is provided inside the dehydration tank (3).
is installed.

This dehydration tank (7) has dehydration holes (9) only in the upper part of the surrounding side wall.
) was drilled. The lower part is a completely closed gutter-shaped water storage part (7a) with no dewatering hole or drainage hole formed, and a vertical blade body (8) is formed on the inner peripheral surface of this water storage part (7a) reaching all the way to the bottom surface. Multiple lines are protruded at appropriate intervals.

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 (16) is attached to the outer surface of the bottom of this dehydration tank (7).
, a mounting bracket (18) is provided with a nut (17), a dehydration shaft (6) is attached via this mounting bracket (18), and a dehydration motor (
5), and is driven to rotate at high speed by the rotation of the motor (5).

In the figure, (19) is the cover installed inside the bottom of the dehydration tank (7), (13) is the dehydration receiver cover installed at the top opening of the dehydration tank (3), and (10) is the dehydration lid above it. The dewatering lid (10) is connected to a brake mechanism (14) provided in the middle of the dehydrating shaft (6) through an operating wire (15), and the dehydrating lid (10)
10) is opened, a brake mechanism (14) is activated to stop the rotation of the dehydration tank (7) to ensure 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, the rotation speed of the dehydration tank (7) is further set on the opposite load side of the dehydration motor (5).
A speed generator (20) consisting of a coil (20a) and a magnet (20b'') was installed as a means for detecting the rotation angle, 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. 2, and has a power supply (
28), the operation switch section (31) attached to the operation panel of the washing machine, some other sensors such as the water level sensor (32), and the output from the lid switch (37) that is activated by opening and closing the dehydration lid (10). A microcomputer (
27), the output from the microcomputer (27) is connected to a display (29) that displays the progress of the process, and an amplifier (3) that includes a drive circuit that controls the dehydration motor (5).
0) was introduced.

In addition, the speed generator generated voltage (34), which is a sine waveform as shown in FIG.
3), capacitor (24), I-transistor (2)
5) Convert it to a waveform shaped voltage (35) which is a 5V rectangular wave via the resistor B (26) and input its period T to 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).

If the amount of laundry is small, use the dehydration tank (7) of a two-tub washing machine.
To do laundry, first open the dehydration lid (10), put the laundry in the dehydration tank (7), add detergent, and set the water supply switch cock (not shown) to the "dehydration tank side". Then, water is supplied into the water storage part (7a) of the dehydration tank (7), and when it reaches a predetermined water level, the water supply is stopped [step (a)], and the operation switch part (31) is used to, for example, wash for 5 minutes, dehydrate ( (including drainage) set to 1 minute. After this, the flag (S) necessary for washing operation
ONF=OR&LP=1) is automatically set [step (b)].

Here, a method for 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 dehydration motor (5) rotates once, the magnet (20b') attached to the motor shaft rotates once, outputting 18 sine waves, and dewatering. Water tank (7) or dehydration motor (5) is 100
The period T per -sine wave of the speed generator (20) when rotating at revolutions/minute is calculated using the following formula: T=1/fX1/18 = 1/(100XI/60) X 1/18
X1000=, 33.3m5ec\. In other words, if the microcomputer (27) detects this period T = 33.3 m5ec, it is possible to determine that the rotational speed is 100 revolutions/minute. Resistance (A) (2
2), diode (23), capacitor (24)
, ) It goes without saying that the sine wave is converted into a 5V rectangular wave by the transistor (25) and the resistor (B) (26).

Regarding calculation of the rotation angle, when the dehydration motor (5) rotates once (360"), the speed generator (20) rotates once.
Since it outputs 8 sine waves, its resolution is 360° ÷ 18
= 20". In other words, when the speed generator (20) outputs one sine wave, the dehydration motor (5) rotates 20 degrees, and the dehydration tank (7) directly connected to it rotates at the same angle of 20 degrees.
This means that it has rotated by °.

By the way, in step (c), 5ONF 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 specified values. Since the speed does not reach 1 second, 80°, and 200 revolutions/minute, the process moves to step (g), and since R&LF=1, the dewatering motor (5) is energized and starts normal rotation.

When the dehydration motor (5) starts rotating, the speed generator (2)
0), and the rectangular wave mentioned earlier as the energization pulse is input to the microcomputer (27). Here, if we count the number of energization pulses four times, we get
The rotation angle of the dehydration motor (5), that is, the dehydration tank (7) is 80' [step (e)]. In addition, the period T between the pulses is also measured at the same time, and if the period corresponds to 200 revolutions/minute, go to step (step), and if the energization time is the predetermined 1 second, 5ONF = 1. The motor (5) stops rotating. [Step (chi)].

In this way, any one of the energization time, rotation speed, and rotation angle
When the value reaches the specified value, the rotation of the motor (5) stops at that point.

Now, 5ONF is set to 1, and the washing time of 5 minutes has not yet elapsed, so we return to step (c) and move on to step (wa). Power time: 1 second, rotation angle: 240°, rotation speed: 1
5ONF= if any of 0 revolutions/min is detected.
O, R&LF=1 orO (step (su) ~ (wo))
Make it. By setting 5ONF=O and R&LF=1 oro, the rotational direction of the motor (5) is now reversed from the previous time in step (W), 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 on when the rotation angle is 80° and off when the rotation angle is 240°.
As shown in the figure, it is 100 revolutions/minute off and 95 revolutions/minute on. However, when the voltage is high and the load is extremely small,
Since the motor (5) starts up quickly and sometimes reaches 250 revolutions/minute, it is configured to turn off at 200 revolutions/minute so as not to cause malfunctions such as washing liquid flowing out.

Furthermore, the stop detection of 10 rotations/minute during inertial rotation of the dewatering tank (7) is for protection when a brake operation is performed due to opening of 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. )].

When washing is completed, the process moves to dehydration (including drainage), and the dehydration motor (5) is energized in the forward rotation direction [step (Y)], and dehydration is performed for 1 minute [step (ri) (
death)〕. 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), the process is the same as when washing, except that no detergent is added.

Further, when performing normal dehydration in the dehydration tank (7), if only dehydration is set at the cent stage of the process, 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 photointerrupters, Hall elements,
It is also possible to use a reed switch or the like.

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 tank, the forward and reverse control of the dehydrating tank is controlled not only by the energization time to the motor but also by the rotational speed of the dehydrating tank. Since it is based on the rotation angle, 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 flowing out of the tank can be prevented. can be prevented.

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

[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 diagram, and FIG. 4 is a waveform diagram of the rotation speed detection circuit section.
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. Figure 8 is an electrical circuit diagram for controlling the dehydration motor. (1)...Outer box (2)...Bottom frame (3)
... Dewatering tank (4) ... Drain hose (5) ...
・Dehydration 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)...Near)
(1B)...Mounting bracket (19)...Cover (20)...Speed generator (20a)...
・Coil (20b)...Magnet (21)...
・Controller (22)...Resistance A (23)...
Diode (24)...Capacitor (25)...
...Transistor (26)...Resistance B (27)...
・Microcomputer-(28)...Power supply
(29)...Indicator (30)...Amplifier
(31)...Operation switch section (32)...Sensor part (34)...Speed generator generated voltage (35)...
・Waveform shaping voltage (36)...Timer (37)...
・Lid switch

Claims (1)

[Claims] In a washing machine that performs washing by reversing the washing and dehydration tub in forward and reverse directions, a means for detecting the rotation speed and rotation angle of the washing and dehydration tub is provided, and the detected rotation speed, rotation angle, and a predetermined cycle are detected. A washing machine operation control method characterized in that when any one of the power outage times reaches a specified value, the dehydrating motor is turned on and off and the washing and dehydrating tub is reversed and reversed.