JPH07124380A - Washing machine - Google Patents

Abstract

PURPOSE:To enhance safety in dehydrating by detecting the slit of a washing tub cover when the cover is slightly opened in dehydrating, in a washing machine, which stops the operation when the washing tub cover is opened in dehydrating to keep safety. CONSTITUTION:A washing machine is provided with a lead switch 16 which is mounted on a printed wiring board disposed in the upper surface of the washing machine and works according to a magnet mounted on a washing tub cover, an opening cover detecting switch 8 which becomes on when the washing tub cover is closed and becomes off when a washing and dehydrating tub vibrates abnormally and a control means 11 controlling a series of processes which comprises washing, rinsing, and dehydrating judges that if either the lead switch 16 or the opening cover detecting switch 8 becomes off, the washing tub cover opens.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stops operation when the washing tub lid is opened during spin-drying or when an imbalance occurs,
It relates to a washing machine that ensures safety.

[0002]

2. Description of the Related Art In recent years, as safety measures for electric appliances have advanced,
Even in a washing machine, it is required to further improve safety.

Conventionally, this type of washing machine has been constructed as shown in FIGS. 7 and 8. The configuration will be described below.

As shown in the figure, the washing / dehydrating tub 1 has a stirring blade 2 rotatably provided at the bottom thereof, which reduces the driving force from a motor 4 via a speed reduction mechanism 3 so that the stirring blade 2 can be washed.
The driving force is transmitted to the washing and dehydrating tub 1 at the time of dehydration. Switching between dehydration and washing at this time is performed by driving the drain valve 5, and when the drain valve 5 is driven, the wash water is drained and the clutch of the speed reduction mechanism 3 is switched to perform the dehydration operation.

The washing tub lid 6 has a folding structure having a hinge in the center thereof and covers the upper opening of the washing machine body 7. The lid detecting switch 8 is a bearing portion 6 of the washing tub lid 6.
The lever 6b provided in the vicinity of "a" opens and closes the contact according to the opening and closing of the washing tub lid 6. Control device 9
Is disposed on the operation display unit 10 on the upper front surface of the washing machine main body 7 so as to sequentially control a series of steps of washing, rinsing and dehydrating.

The lid detection switch 8 is, as shown in FIG.
When the washing tub cover 6 is closed, the switch lever 80 is pushed up in the direction of arrow A by the lever 6b, and the contacts 82a and 82b are closed via the movable body 81. Also,
When the washing / dehydrating tub 1 vibrates greatly during the dehydration operation, the lever 83 is pushed in the direction B, and the contacts 82a and 82b closed by the switch lever 80 are pushed to open the movable body 81.

In the above configuration, when the user inputs the dehydration operation setting to the control device 9 or enters the dehydration process in the fully automatic operation, the control device 9 drives the drain valve 5 and the motor 4 to decelerate. The washing / dehydrating tub 1 is rotationally driven via the mechanism 3. When the user opens the washing tub lid 6 during this dehydration operation, the contacts 82a and 82b of the lid detection switch 8 which are closed by being held by the lever 6b are opened, and a signal for opening the lid is input to the control device 9 to control the control device. Reference numeral 9 stops the rotation of the motor 4 and the drive of the drain valve 5. When the drive of the drain valve 5 is stopped, the brake mechanism in the speed reduction mechanism 3 works and the washing and dehydrating tub 1 is decelerated and stopped.

If clothes in the washing / dehydrating tub 1 are biased during such a dewatering operation, the washing / dehydrating tub 1 sways left and right, and the washing machine body 7 vibrates. At this time, the vibration of the washing / dehydrating tub 1 pushes the lever 83 of the lid detection switch 8 to output a pulse signal of about Pw = 50 to 200 msec from the contacts 82a and 82b, as shown in FIG. Input to the device 9. Control device 9
Detects the unbalance during the dehydration operation by this signal, stops the dehydration operation, supplies water to the washing and dehydration tub 1, agitates the clothes with the stirring blades 2 to correct the bias, and then drains and dehydrates again. continue.

[0009]

In such a conventional washing machine, the contact 8 of the lid detection switch 8 when the washing tub lid 6 is closed.
2a, 82b contact pressure at the time of turning on, lever 83
It is necessary to satisfy a plurality of factors such as the detection sensitivity at the time of unbalance of dehydration, and the lever 6b for driving the lid detection switch 8 may be close to the bearing portion 6b of the washing tub lid 6,
The angle of the washing tub lid 6 when the contacts 82a and 82b are opened is 10
It will be about degree. The washing tub lid 6 and the operation display section 10 at this time
The distance between and was about 5 cm, and in some cases, there was a risk that a finger or the like would come into contact with the rotating washing / dehydrating tub 1, resulting in injury or the like.

The present invention is to solve the above-mentioned problems, and while satisfying the conditions such as the sensitivity of unbalance detection during the dehydration operation, the opening detection angle of the washing tub lid is lowered to slightly open the washing tub lid. Stop the washing and dehydration tub with a bamboo shoot,
The first purpose is to further improve safety.

A second object is to prevent the user from accidentally detecting the imbalance during dehydration by accidentally touching the washing tub lid.

[0012]

In order to achieve the first object of the present invention, the present invention has a control means for controlling a series of steps of washing, rinsing and dehydrating, and a print disposed on the upper surface of a washing machine body. A first lid detecting means mounted on the wiring board and responsive to a magnet attached to the washing tub lid, and a second lid which is turned on when the washing tub lid is closed and is turned off when the washing / dehydrating tub abnormally vibrates.
And a lid detecting means for the washing tub, and the control means determines that the washing tub lid is open when one of the first lid detecting means and the second lid detecting means is turned off. This is the first means for solving the problem.

In order to achieve the second object, the control means of the first problem solving means is such that the first lid detecting means is turned on and the second lid detecting means is temporarily operated for a predetermined time or less. The second problem solving means is to determine that the washing / dehydrating tub is abnormally vibrating when a general off operation is performed.

[0014]

According to the first means for solving the above problems, the present invention provides:
Since the detection angle when the washing tub lid is opened can be set by the distance adjusted by the sensitivity of the first lid detection means and the strength of the magnet, the opening detection angle of the washing tub lid can be lowered. . Further, since it is determined that the lid is open simply by turning off either the first lid detection means or the second lid detection means, the safety can be further improved.

Further, according to the second problem solving means, when the first lid detecting means is turned on and the second lid detecting means is temporarily turned off for a predetermined time or less, the washing / dehydrating tub is abnormal. Since it is determined that the vibration is occurring and the imbalance during the dehydration is detected, it is possible to prevent the user from accidentally detecting the imbalance during the dehydration, for example, by accidentally touching the washing tub lid.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, the control means 11 controls the motor 4, the drain valve 5, the water supply valve 13 and the like via the power switching means 12 composed of a bidirectional thyristor and the like to wash the laundry. It controls a series of steps of rinsing, dehydration. The operation display unit 14 is for inputting operation settings such as washing, rinsing, and dehydration, and displaying an operation state. The water level detecting means 15 detects the water level in the washing / dehydrating tank 1 and inputs the output to the control means 11 so that water can be supplied up to a predetermined water level.

Reed switch (first lid detecting means) 16
Is mounted on the printed wiring board 18 of the control device 17 disposed on the upper surface of the washing machine body 7, and turns on when the magnet 19 attached to the tip of the washing tub lid 6 approaches and turns off when the magnet 19 leaves. To do. Lid detection switch (second lid detection means) 8
Turns on when the washing tub lid 6 is closed, and turns off when the washing / dehydrating tub 1 abnormally vibrates.

As described above, the control means 11 controls a series of steps of washing, rinsing, and dehydrating, and when either the reed switch 16 or the lid detection switch 8 is turned off, the washing tub lid 6 is closed. I try to determine that it is open. Further, when the reed switch 16 is turned on and the lid detection switch 8 is temporarily turned off for a predetermined time or less, it is determined that the washing / dehydrating tub 1 is abnormally vibrating.

As shown in FIG. 3, the control device 17 includes a microcomputer (not shown) constituting the control means 11, a display light emitting diode 20 constituting the operation display means 14, and a switch on the printed wiring board 18. 21, the resistor 23, and the capacitor 23 are mounted, and the reed switch 16 is mounted.
It is located to face. FIG. 4 is a configuration diagram of the reed switch 16, in which a glass tube reed switch body 25 is fitted in a resin case 24.

To explain the operation in the above configuration, when the dehydration operation setting is input from the switch 21 of the operation display means 14 or when the dehydration process is started in the fully automatic operation, the control means 11 causes the power switching means 12 to be operated. The drainage valve 5 and the motor 4 are driven to rotate the washing / dehydrating tub 1 via the speed reduction mechanism 3. At this time, since the washing tub lid 6 is closed, the lid detection switch 8 and the reed switch 16 are on.

When the user opens the washing tub lid 6 during this dehydration operation, as shown in FIG. 5 (a), first, the reed switch 1
6 is turned off, and subsequently, the lid detection switch 8 is turned off as shown in FIG. The control means 11 determines that the washing tub lid 6 is open at the point C in FIG. 5, stops the rotation of the motor 4, and stops the driving of the drain valve 5. Drain valve 5
When the driving is stopped, the brake mechanism in the speed reduction mechanism 3 operates, and the washing / dehydrating tub 1 is decelerated and stopped.

At this time, the distance between the magnet 19 and the reed switch 16 at which the reed switch 16 is turned on and the distance at which the reed switch 16 is turned off can be determined by the moving value of the reed switch 16, the open value, and the magnetic flux density of the magnet 19. You can, for example,
The on distance can be set to 10 mm and the off distance can be set to 30 mm.

Next, when the clothes in the washing / dehydrating tub 1 are biased during the dewatering operation, the reed switch 16 is turned on and the vibration of the washing / dehydrating tub 1 is vibrated, as shown in FIG. 6 (a). As a result, as shown in FIG. 6B, only the lid detection switch 8 is turned off for about Pw = 50 to 200 ms. Control means 11
Is judged to be an imbalance of dehydration only under this condition,
After the dehydration operation is stopped and water is supplied to the washing and dehydrating tank 1, the clothes are agitated by the agitating blades 2 to correct the unevenness, and then drained again to continue the dehydration.

Although the first lid detecting means is constituted by the reed switch 16 in the above-mentioned embodiment, any means such as a hall element that responds to the magnet attached to the washing tub lid 6 may be used. There is no end.

[0026]

As is apparent from the above embodiments, according to the present invention, the control means for controlling the series of steps of washing, rinsing and dehydrating, and the printed wiring board provided on the upper surface of the main body of the washing machine are provided. It is provided with a first lid detecting means which is mounted and responds to a magnet attached to the washing tub lid, and a second lid detecting means which is turned on when the washing tub lid is closed and is turned off when the washing / dehydrating tub abnormally vibrates. Since the control means determines that the washing tub lid is open when either the first lid detection means or the second lid detection means is turned off,
Since the opening detection angle of the washing tub lid can be made smaller, the safety during operation of the washing machine can be further improved, and the first lid detection means is mounted on the printed wiring board of the control device. Therefore, the wiring from the first lid detection means to the control means, the connector, etc. are not required, so that the cost can be reduced and various measures against noise can be reduced. In addition, since it is determined that the lid is open only by turning off either the first lid detection means or the second lid detection means, safety can be further improved.

In the control means, the washing / dehydrating tub is abnormally vibrated when the first lid detecting means is turned on and the second lid detecting means is temporarily turned off for a predetermined time or less. Therefore, for example, the user does not accidentally detect the imbalance during dehydration by accidentally touching the washing tub lid.

[Brief description of drawings]

FIG. 1 is a block diagram of a washing machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of the washing machine.

FIG. 3 is a perspective view of a control device of the washing machine.

FIG. 4 is a sectional view of a reed switch of the washing machine.

[Fig. 5] (a) (b) Time chart of signals when the washing tub lid of the same washing machine is opened

[Fig. 6] (a) (b) Time chart of signals when the washing machine is unbalanced by dehydration

FIG. 7 is a sectional view of a conventional washing machine.

FIG. 8 is a sectional view of a lid detection switch of the washing machine.

FIG. 9 is a time chart of signals when the washing machine is unbalanced by dehydration.

[Explanation of symbols]

 6 Washing tub lid 7 Washing machine body 8 Lid detection switch (second lid detection means) 11 Control means 16 Reed switch (first lid detection means) 18 Printed wiring board 19 Magnet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Matsuo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A control means for controlling a series of steps of washing, rinsing, and dehydrating, and a magnet mounted on a printed wiring board disposed on an upper surface of a main body of a washing machine and responsive to a magnet mounted on a lid of a washing tub. Lid detecting means and second lid detecting means which is turned on when the washing tub lid is closed and is turned off when the washing / dehydrating tub abnormally vibrates, and the control means includes the first lid detecting means or the first lid detecting means. A washing machine that determines that the washing tub lid is open when either one of the two lid detection means is turned off. 2. The washing and dehydrating tub abnormally vibrates when the first lid detecting means is turned on and the second lid detecting means is temporarily turned off for a predetermined time or less. The washing machine according to claim 1, wherein the washing machine is determined to be.