JP2749304B2 - Fully automatic washing machine - Google Patents

Description

The present invention relates to a fully automatic washing machine having an electronic control circuit in an operation control system, and more particularly, to an improvement in a dehydration operation control system in a fully automatic washing machine. . 2. Description of the Related Art In recent years, the operation control of an electric washing machine is mostly performed by an electronic control circuit instead of a conventional mechanical timer. Then, the dehydration operation system generally detects the open / closed state of the dehydration lid (the washing and dehydration lid in the case of a fully automatic washing machine) with a lid state detection circuit, and captures the output into an electronic control circuit such as a micro computer. The program is programmed to confirm the signal input in the lid closed state and shift to the dehydration operation, in which the electronic switch is short-circuited to perform the dehydration operation. [Problems to be Solved by the Invention] By the way, in the case of an electric washing machine adopting an electronic control system for the operation control system, if the electronic control circuit malfunctions due to electrostatic noise or lightning surge, etc. The danger of accidental start of dehydration operation when the dehydrating lid (or washing and dehydrating lid) is open, that is, a dehydrating tub that rotates at a high speed when the dehydrating lid (or washing and dehydrating lid) is open (in the case of a fully automatic washing machine, There is a risk that a part of the human body comes into contact with the washing and dewatering tub. On the other hand, for example, Japanese Patent Application Laid-Open No. 62-38197 discloses a technique for stopping the spin-drying operation when the lid switch is opened even if the control device has failed. A first object of the present invention is to provide a fully automatic washing machine that employs an electronic control system for its operation control system, even if a trouble occurs in an electronic control circuit due to electrostatic noise or lightning surge. Also, there is no danger of accidental start of dehydration operation with the washing and dewatering lid open, that is, there is no danger of part of the human body coming into contact with the washing and dehydrating tub that rotates at high speed with the washing and dehydrating lid open. In addition to the above, a malfunction peculiar to a fully automatic washing machine in the event that the electronic control circuit malfunctions and an unexpected dehydration operation is started, that is, a malfunction when the washing water is full in the washing and dewatering tub, In other words, an object of the present invention is to prevent overload burnout of an electric motor due to spinning of a heavy washing and spinning tub in a full state. Further, a second object of the present invention is that the first object
In addition to the purpose of the above, there is another malfunction peculiar to the fully automatic washing machine in a case where the electronic control circuit malfunctions and the accidental dehydration operation is started, that is, the stirring blade arranged in the washing and dewatering tub. An object of the present invention is to prevent a problem caused by rotation, in other words, to prevent damage to an object to be washed due to rotation of a stirring blade when there is no water (or a small amount of water) in a washing and dewatering tub. Means for Solving the Problems The first object of the present invention is to provide a fully automatic electric washing machine having an electronic control circuit and a centrifugal dewatering mechanism, in which the washing and dewatering tub has no water. Is detected by a switch responsive to the water level detection device,
Moreover, when the closing operation of the washing and dehydrating lid is detected via a switch responsive to the opening and closing operation of the lid, the washing / dehydrating mode of the washing machine is switched to the dehydrating mode. Is done. Conventionally, when the washing mode of the fully automatic washing machine is switched to the spin-drying mode side, the time when the water level detector detects that the inside of the spin-drying tub is out of water, There are two cases in which the water level is detected by the water level detection device when the inside of the washing machine has dropped to a certain small amount of water. In the latter case, the first purpose is to reduce the inside of the washing and water tub of the washing machine by a certain amount. Is detected by a switch responsive to the water level detection device, and the closing operation of the washing and dewatering lid is detected via a switch responsive to the opening and closing operation of the lid. If you do,
This is achieved by switching the dehydration mode to the dehydration mode. Further, a second object of the present invention is to provide a fully automatic electric washing machine having an electronic control circuit and a centrifugal dewatering mechanism, wherein a switch for responding to the water level detecting device that there is no water in the washing and dewatering tub. And when the closing operation of the washing and dehydrating lid is detected via a switch responsive to the opening and closing operation of the lid, the washing / dehydrating mode of the washing machine is switched to the dehydrating mode side. At the same time, when the washing and dewatering lid is in the open state, the electric motor is turned on only when it is detected that the inside of the washing and dewatering tub is full by the switch responding to the water level detecting device. This is achieved by a configuration in which the stirring blade is rotated. The time when the washing mode of the fully automatic washing machine is switched to the spin-dry mode is when the water level detector detects that the inside of the washing and spin-drying tub has dropped to a certain small amount of water. The second purpose is to detect when the inside of the washing and dewatering tub of the washing machine has dropped to a certain small amount by a switch responsive to the water level detecting device, and to close the washing and dewatering lid. , When it is detected through a switch that responds to the opening and closing operation of the lid,
When the dehydration mode is switched to the dehydration mode and the washing and dehydrating lid is in the open state, when the inside of the washing and dehydrating tub is full with the switch responding to the water level detecting device. This is achieved only when the motor is turned on to rotate the stirring blade. [Operation] Here, the operation of the washing machine of the present invention will be described below. First, the present invention relates to a fully automatic electric washing machine having an electronic control circuit and a centrifugal spin-drying mechanism. The washing / dehydrating mode of the washing machine is dehydrated when the operation is detected by the corresponding switch and when the closing operation of the washing and dehydrating lid is detected via the switch responding to the opening and closing operation of the lid. By switching to the mode side, in the state where the washing and dehydrating lid is open, the drive circuit for the dehydrating operation is not closed. (1) Even if a trouble occurs in the electronic control circuit, there is a risk due to accidental start of dehydration operation with the washing and dewatering lid open, that is, for the washing and dehydrating tub that rotates at high speed with the washing and dehydrating lid open. , A part of the human body In addition to being able to prevent the danger of touching, if the washing and dewatering tub of the fully automatic washing machine is full and the washing and dewatering lid is closed, even if the washing and dehydrating lid is closed, even if there is static noise or lightning surge, etc. Accordingly, even if the electronic control circuit malfunctions, the heavy washing and dewatering tub in a full state is not rotated by dehydration, and overload burning of the electric motor can be prevented. Further, the present invention relates to a fully automatic electric washing machine having an electronic control circuit and a centrifugal dewatering mechanism, wherein a switch for responding to the water level detecting device that there is no water (or a small amount of water) in the washing and dewatering tub. And when the closing operation of the washing and dehydrating lid is detected via a switch responsive to the opening and closing operation of the lid, the washing / dehydrating mode of the washing machine is switched to the dehydrating mode side. At the same time, when the washing and dewatering lid is in the open state, the electric motor is turned on only when it is detected that the inside of the washing and dewatering tub is full by the switch responding to the water level detecting device. By using a configuration in which the stirring blades are rotated, it is possible to prevent the risk of accidental dehydration operation when the washing and dehydrating lid is opened, and to rotate the heavy washing and dehydrating tub in a full state by rotating the electric motor. Overload In addition to being able to prevent damage, if the washing and dewatering tub of a fully automatic washing machine is water-free and the lid for washing and dewatering is closed, electronic noise caused by electrostatic noise, lightning surge, etc. Even if a trouble occurs in the control circuit, the electric motor is not turned on, and it is possible to prevent the washing object from being damaged due to the rotation of the stirring blade in the washing / dewatering tub without water (or a small amount of water). [Embodiment] Hereinafter, the present invention will be described with reference to one embodiment of FIGS. 1 to 3. FIG. 1 is a control flow chart during a dehydrating operation of the washing machine of the present invention, and FIG. FIG. 3 is a vertical sectional side view showing the internal structure of the washing machine, and FIG. 3 is an electric circuit diagram of the washing machine of the present invention. In FIG. 2 showing the internal structure of the washing machine of the present invention, the washing and dewatering tub 4 is located inside the outer tub 3. The stirring blade 6
It is arranged at the center of the bottom of the washing and dewatering tub 4. Outer tub 3
Are elastically supported on the upper part of the outer frame 1 via the hanging rods 2. A balance ring 5 is disposed above the washing and dewatering tub 4, and a tub cover 7 is provided so as to cover the balance ring 5. The top cover of the outer frame 1 has a top cover
17 is arranged, and in the center of the top cover 17,
A washing and dehydrating cover 18 is provided so as to cover an upper portion of the clothes inlet 17a. Behind the top cover 17, the electronic control unit 20, and also the water supply valve
A panel section 17b having a water supply section 19 including a water supply hose 19c, a water supply port 19b, and the like is provided. One end of a tube 21a is connected to a lower portion of the outer tub 3 and is connected to the tube 21a.
Is connected to a pressure switch 21 disposed in the panel section 17b.
It is connected to. In the lower part of the outer tub 3, in addition to the motor 12, the motor cooling fan 12a, a motor pulley 14a, a V belt 14c,
A power transmission unit 14 including a pulley 14b and the like, and a clutch unit 8 are provided. The clutch portion 8 is provided with a spring clutch 13, a brake lever 15, a brake band 22, and the like. One end of the drain valve 9 is connected to a lower portion of the outer tub 3, and the other end of the valve 9 is connected to a drain hose 13. The hose 13 is drawn out from the hole 11 of the outer frame 1 to the outside. I have. Brake lever 15 is a locking part
16 which generates a braking force by engaging with the brake 22. In the above configuration, a series of washing steps are performed in accordance with a command from the electronic control unit 20. First, a water supply valve 19a is energized according to a washing start instruction, and the washing and dewatering tub 4 is supplied from the water supply port 19. Water is injected inside. When water accumulates in the washing and dewatering tub 4 and reaches a predetermined water level, the water pressure is transmitted to the pressure switch 21 via the tube 21a, the water supply is stopped by the signal, and the washing is started. That is, the power of the electric motor 12 is transmitted to the clutch unit 8 via the power transmission unit 14. At this time, the brake lever
Reference numeral 15 is engaged with the brake band 22 to prevent the washing and dewatering tub 4 from rotating. After performing the washing process for a specified time, the process enters a drainage process. That is, when the power supply to the electric motor 12 is stopped and the power supply to the drain valve 9 is applied, the water in the washing and dewatering tub 4 is discharged out of the machine via the drain hose 10. Next, a dehydration step is started. That is, the power supply to the electric motor 12 is restarted, and the brake lever 15 is released. Electric motor 12
Is transmitted to the washing and dewatering tub 4 through the spring clutch 13, and the washing and dewatering tub 4 starts rotating at high speed. After performing dehydration for a specified time, water supply is started again, and after entering the rinsing step, the same steps as described above are performed to complete a series of washing operations. In FIG. 1 showing the control flow during the spin-drying operation of the washing machine of the present invention, when the washing mode is switched to the spin-drying mode, the washing and spin-drying tub (4 in FIG. 2) is drained to drain water. The water level detecting device indicated by reference numeral 23 in FIG.
Alternatively, when it is detected that the washing and dehydrating cover 18 has become extremely small, the open / close state of the washing and dewatering lid 18 is checked. Then, via a lid state detection device 24 that operates in response to opening and closing of the lid 18,
If a drive current for switching the operation mode switching mechanism 25 is made to flow, as long as the lid 18 is open and the lid state detection device 24 is open, the operation mode switching mechanism 25 does not operate and the dehydration operation is not performed. . On the other hand, if the lid 18 is closed,
The lid state detecting device 24 shown in FIG. 3 outputs that the lid 18 is in the closed state, shifts to a dehydration operation, and performs dehydration. By the way, the electronic control circuit is very complicated, and no matter how high the reliability is, it cannot be said that there is no failure at all.
In particular, the part of the electronic control circuit that has the highest probability of failure is the part that is programmed and controlled by a weak current, such as a microcomputer, and has the danger of runaway due to a strong pulse from outside such as line noise. In this case, even when the washing and dewatering tub indicated by reference numeral 4 in FIG. 2 is full, a signal for the dehydration operation step is generated, and the current for driving the load by operating the switch circuit may flow. . On the other hand, according to the above-described embodiment, the risk of accidental start of the dehydration operation when the washing and dehydrating tub is opened, that is, the washing and dehydrating tub 4 that rotates at a high speed with the washing and dehydrating lid open, causes a human body to fail. In addition to being able to prevent the danger of partial contact, in addition to the fact that the washing and dewatering tub 4 of the fully automatic washing machine is full and the washing and dewatering lid 18 is closed, even if the washing and dewatering lid 18 is closed, Even if the control circuit 26 malfunctions due to noise, lightning surge, or the like, the heavy washing and dewatering tub 4 in a full state is not rotated by dehydration rotation, and overload burning of the electric motor 12 can be prevented. In addition, in the fully automatic washing machine, an operation mode switching mechanism such as the clutch unit 8 is employed as a specific means for switching between the washing operation and the dehydration operation. The spin-drying tub 4 is rotated at a high speed. By the way, after setting the dehydration timer,
If you forget to close 18, the program timer will advance and close this cover 18 on the way, even if you perform the dehydration operation, the dehydration time will be too short, eventually resulting in insufficient dehydration. In order to prevent the result of insufficient dehydration from occurring, as shown in FIG. 1, the timing of the dehydration timer with the washing and dehydrating lid open may be stopped. FIG. 4 shows another embodiment of the present invention. That is, in the case of FIG. 4, the signal of the water level detecting device 23 and the signal of the lid state detecting device 24 are superimposed, and the output signal and the dehydration signal of the control circuit 26 are combined and input to the switch circuit 27. A dehydration operation signal is input to the switch circuit 27 only when the signal from the water level detection device 23 is empty (or a small amount of water), and only when the washing and dehydrating lid is closed. 4, the danger of accidental start of the spin-drying operation with the washing and dewatering lid open, that is, the washing and dewatering tub that rotates at a high speed with the spinning-drying lid open, may cause the human body to have a danger. In addition to preventing the risk of contact between the washing and dewatering tubs, if the washing and dewatering tub of the fully automatic washing machine is full and the washing and dewatering lid is closed, even if static electricity noise or lightning Control circuit 26 malfunctions due to surge etc. Even, rather than heavy washing and dewatering tank in the full level one which dewatering rotation, it is possible to prevent overloading burnout of the motor. FIG. 5 shows still another embodiment of the present invention. That is, in the case of FIG. 5, when the inside of the washing and dewatering tub is out of water (or a small amount of water), the switch is shut off, and when there is water, the switch to be connected is replaced by a switch that responds to the opening and closing operation of the washing and dewatering lid. And connected in parallel. In the configuration of FIG. 5, when the inside of the washing and dewatering tub is empty (or a small amount of water) and the washing and dewatering lid is open, the two switches are open, and the electric motor is accordingly turned off. No drive current flows through 12, and neither the stirring blade nor the washing and dewatering tub work. When the inside of the washing and dewatering tub is full and the washing and dewatering lid is open, the switch on the water level detecting device 23 side is closed, so that the drive current can be passed to the electric motor 12 and the control circuit In response to the wash signal from 26, the elements of the switch circuit 27 conduct, and the electric motor 12 rotates to rotate the stirring blade. When the inside of the washing and dewatering tub becomes empty (or a small amount of water) after the drainage process, the switch on the water level detecting device 23 side opens, and no drive current flows to the electric motor 12. At this time, the control circuit 26 reads that the drainage in the washing and dehydrating tub has been completed, but also reads that the washing and dehydrating lid is open, and does not shift to the dehydrating operation. The operator is informed that the dehydration lid is open, if necessary, and waits for the lid to be closed. When the washing and dehydrating lid is closed, the switch corresponding to this is closed, and the motor
The control circuit 26 that has read that the drive current has flowed through 12 and the washing and spin-drying lid has been closed outputs a spin-drying operation signal,
The drive control element of the operation mode switching mechanism of the switch circuit 27 is electrically connected to the drive control element on the dehydration operation side of the electric motor 12 to perform the dehydration operation. Thus, according to the embodiment of FIG. 5, it is possible to prevent the risk of accidental start of the spin-drying operation in the state where the spin-drying lid is opened, and to rotate the heavy spin-dry tub that is full of water. In addition to being able to prevent overload burnout of the electric motor, even if the washing and dewatering tub of the fully automatic washing machine is empty (or a little water) and the washing and dewatering lid is closed, even if the lid is closed, Even if a trouble occurs in the control circuit 26 due to noise, lightning surge, or the like, the motor 12 does not turn on, and the washing and dewatering due to the rotation of the stirring blade in the washing / dewatering tub without water (or a small amount of water). Damage to objects can be prevented. The configuration shown in FIG. 4 and the configuration shown in FIG. 5 can be combined. Hereinafter, the embodiment will be described with reference to FIGS. 6 to 9. FIG. 6 shows an electric circuit diagram of this embodiment, and FIG. 7 shows a state-output combination of the washing machine shown in FIG. FIG. 8 is a diagram showing the truth value of the AND circuit indicated by reference numeral 28 in FIG.
FIG. 9 is a diagram showing the truth values of the AND circuit indicated by reference numeral 29 in FIG. Thus, the water level detection device 23 and the lid state detection device 24 in the present embodiment have both a function of opening and closing the high-power circuit in accordance with each detection state and a function of outputting a detected state signal to the control circuit 26. As shown in the combination table of FIG. 7, the state quantity and the output are the operation modes only when the inside of the washing and dehydrating tub is empty (or a little water) and the washing and dehydrating lid is open. The switching mechanism 25 and the electric motor 12 are not connected to the power line, so that the operation of the washing machine is disabled. In other combinations, the operation of the washing machine is enabled. That is, assuming that the water level detection input of the control circuit 26 is P and the lid state detection input is F, as shown in a truth table of FIG. When the dehydration lid is opened, it is set to 0, when the washing and dehydration lid is closed, it is set to 1. When the F input is 0, the timing of the dehydration timer is stopped, and when the F input becomes 1, the dehydration timer is operated. Dehydration is always performed for the initially set time. Now, in order for the operation mode switching mechanism 25 to operate and enter the dehydration operation mode, the output SG of the AND circuit indicated by the reference numeral 29 in FIG. 6 needs to be 1; As shown in the truth table, the washing program proceeds to the dehydration step, the output S of the control circuit 26 is in the state of 1 as the dehydration mode output, and the output G of the other AND circuit 28 is 1 and There must be. In order for the output G of the AND circuit 28 to be 1, the output P of the water level detection circuit is inverted and input. Therefore, as shown in the truth table of FIG. The output F of the lid state detection circuit must be 1. That is, if there is no water (or a small amount of water) in the washing and dehydrating tub and the washing and dehydrating lid is not closed,
Even if an abnormality occurs in the control circuit 26 and 1 is output to the output S, the dehydration operation is not performed. Furthermore, even if a failure occurs in the switch circuit 27, as is clear from the combination table of FIG. 7, when the washing and dewatering lid is open, the power wiring must be performed unless the inside of the washing and dewatering tub has water. LL is not energized. Here, although the description partially overlaps with the description of each embodiment,
The configuration and operation of the present invention will be summarized below. First, the present invention relates to a fully automatic electric washing machine having an electronic control circuit and a centrifugal spin-drying mechanism. The washing / dehydrating mode of the washing machine is dehydrated when the operation is detected by a switch that responds and when the closing operation of the washing and dehydrating lid is detected via the switch that responds to the opening and closing operation of the lid. By switching to the mode side, in the state where the washing and dehydrating lid is open, the drive circuit for the dehydrating operation is not closed. (1) Even if a trouble occurs in the electronic control circuit, there is a risk due to accidental start of dehydration operation with the washing and dewatering lid open, that is, for the washing and dehydrating tub that rotates at high speed with the washing and dehydrating lid open. , A part of the human body In addition to being able to prevent the danger of touching, if the washing and dewatering tub of the fully automatic washing machine is full and the washing and dewatering lid is closed, even if the washing and dehydrating lid is closed, even if there is static noise or lightning surge, etc. Accordingly, even if the electronic control circuit malfunctions, the heavy washing and dewatering tub in a full state is not rotated by dehydration, and overload burning of the electric motor can be prevented. Further, the present invention relates to a fully automatic electric washing machine having an electronic control circuit and a centrifugal dewatering mechanism, wherein a switch for responding to the water level detecting device that there is no water (or a small amount of water) in the washing and dewatering tub. , And when the closing operation of the washing and dehydrating lid is detected via a switch responsive to the opening and closing operation of the lid, the washing / dehydrating mode of the washing machine is switched to the dehydrating mode side. At the same time, when the washing and dewatering lid is in the open state, the electric motor is turned on only when it is detected that the inside of the washing and dewatering tub is full by the switch responding to the water level detecting device. By having a configuration in which the stirring blades are rotated, it is possible to prevent the risk of accidental start of dehydration operation when the washing and dehydrating lid is open, and to rotate the heavy washing and dehydrating tub in a full state by rotating the dehydrating motor. Overload In addition to being able to prevent damage, if the washing and dewatering tub of a fully automatic washing machine is water-free and the lid for washing and dewatering is closed, electronic noise caused by electrostatic noise, lightning surge, etc. Even if a trouble occurs in the control circuit, the electric motor is not turned on, and it is possible to prevent the washing object from being damaged due to the rotation of the stirring blade in the washing / dewatering tub without water (or a small amount of water). [Effects of the Invention] According to the present invention, firstly, in a fully automatic washing machine adopting an electronic control system for the operation control system, even if the electronic control circuit is damaged by electrostatic noise or lightning surge, the electronic control circuit may fail. Even when the washing and dewatering lid is opened, there is a risk of accidental dehydration operation start when the lid is open, that is, a part of the human body is In addition to the danger of contact, there is a problem specific to fully automatic washing machines in the event that the electronic control circuit malfunctions and accidental dehydration operation is started, that is, the washing water is full in the washing and dewatering tub. If you have a problem, in other words,
It is possible to obtain a fully automatic washing machine in which overload burnout of an electric motor is prevented by spinning a heavy washing and spinning tub in a full state. According to the present invention, secondly, in addition to the first effect, other inconveniences peculiar to the fully automatic washing machine in a case where the electronic control circuit malfunctions and an unexpected dehydration operation is started. In other words, a problem caused by rotation of the stirring blades disposed in the washing and dewatering tub, in other words, when the stirring blades rotate without water (or a small amount of water) in the washing and dewatering tub, the object to be washed is rotated. A fully automatic washing machine with no damage can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 show one embodiment of the present invention, and FIG. 1 is a control flow chart during a dehydrating operation of a washing machine of the present invention;
FIG. 2 is a longitudinal side view showing the internal structure of the washing machine of the present invention, FIG. 3 is an electric circuit diagram of the washing machine of the present invention, and FIGS. 4 to 6 show other embodiments of the washing machine of the present invention. FIG. 7 is a diagram showing a state-output combination of the washing machine shown in FIG. 6, FIG. 8 is a diagram showing a truth value of a logical product circuit indicated by reference numeral 28 in FIG. 6, and FIG. 7 is a diagram showing the truth value of the AND circuit indicated by reference numeral 29 in FIG. 4 ... Washing and dewatering tub, 6 ... Stirring blade, 12 ... Electric motor, 18
... washing and dehydrating lid, 23 ... water level detecting device, 24 ... lid state detecting device, 25 ... operation mode switching mechanism, 26 ... control circuit, 27 ... switch circuit, 28 and 29 ... logical product circuit .

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Toshihiro Takahashi               1-1-1 Higashitaga-cho, Hitachi-shi Stock Association               Inside the Taga Factory of Hitachi, Ltd.                (56) References JP-A-57-211400 (JP, A)                 JP-A-52-128660 (JP, A)                 JP-A-53-21872 (JP, A)                 JP-A-63-24994 (JP, A)                 JP-A-62-295694 (JP, A)                 JP-A-62-192199 (JP, A)                 JP-A-62-38197 (JP, A)                 62-17991 (JP, U)                 Shokai Sho 51-57551 (JP, U)                 Actual opening Sho 51-71071 (JP, U)                 Jikken 48-13196 (JP, Y1)

Claims (1)

(57) [Claims] In a fully automatic washing machine having an electronic control circuit and a centrifugal dewatering mechanism, when the inside of the washing and dewatering tub is detected by a switch responding to a water level detecting device, and the washing and dewatering is performed. A fully automatic washing machine characterized in that when a closing operation of a lid is detected via a switch responsive to the opening / closing operation of the lid, the washing / dehydrating mode of the washing machine is switched to a dehydrating mode side. . 2. 2. The fully automatic washing machine according to claim 1, wherein the dehydration timer is set, and then the timing of the dehydration timer in a state where the washing and dehydrating lid is opened is stopped. 3. In a fully automatic washing machine having an electronic control circuit and a centrifugal dewatering mechanism, when the inside of the washing and dewatering tub is lowered to a certain small amount by a switch responding to a water level detecting device, In addition, when the closing operation of the washing and dehydrating lid is detected via a switch responsive to the opening and closing operation of the lid, the washing / dehydrating mode of the washing machine is switched to the dehydrating mode. Fully automatic washing machine. 4. 4. The fully automatic washing machine according to claim 3, wherein the dehydration timer is set, and then the timing of the dehydration timer in a state where the washing and dehydrating lid is opened is stopped. 5. In a fully automatic washing machine having an electronic control circuit and a centrifugal dewatering mechanism, when the inside of the washing and dewatering tub is detected by a switch responding to a water level detecting device, and the washing and dewatering is performed. When the closing operation of the lid is detected via a switch that responds to the opening and closing operation of the lid, when the washing / dehydrating mode of the washing machine is switched to the dehydrating mode, and the washing and dehydrating lid is in the open state. The motor is turned on and the stirring blades are rotated only when the washing and dewatering tub is in a full state when it is detected by a switch responsive to the water level detecting device. Fully automatic washing machine. 6. 6. The fully automatic washing machine according to claim 5, wherein after setting a spin-drying timer, timing of the spin-drying timer in a state where the washing and spin-drying lid is open is stopped. 7. In a fully automatic washing machine having an electronic control circuit and a centrifugal dewatering mechanism, when the inside of the washing and dewatering tub is lowered to a certain small amount by a switch responding to a water level detecting device, In addition, when the closing operation of the washing and dehydrating lid is detected via a switch responsive to the opening and closing operation of the lid, the washing / dehydrating mode of the washing machine is switched to the dehydrating mode and the washing and dehydrating lid is opened. When the state is in the state, the motor is turned on and the stirring blade is rotated only when it is detected by the switch responding to the water level detecting device that the inside of the washing and dewatering tub is full. A fully automatic washing machine characterized in that: 8. 8. The fully automatic washing machine according to claim 7, wherein after setting the spin-drying timer, the timing of the spin-drying timer in the state where the washing and spin-drying lid is open is stopped.