JPH08252390A - Washing machine - Google Patents

Abstract

PURPOSE: To provide a washing machine having an abnormal vibration preventing mechanism for precisely detecting the abnormal vibration of a tank, and detecting the collection to one side of washing in the tank before the tank is rotated at high speed. CONSTITUTION: This washing machine has an abnormal vibration preventing mechanism formed of a pulse signal generating means 11 for generating a pulse signal according to the rotating period of a motor shaft; a waveform detecting means for detecting the waveform of the pulse signal from the pulse signal generating means 11; a rotation stop control means for controlling a rotation stopping means 8; a motor control means for controlling the current supplied to a motor 6; and a signal processing means for operating the rotation stopping means 8 when the waveform of the pulse signal detected by the waveform detecting means is changed, and also interrupting the current to the motor 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine equipped with an abnormal vibration preventing mechanism which prevents the entire washing machine from shaking or falling down significantly even if the rotation of the dehydration tank is stopped when abnormal vibration occurs during dehydration. More specifically, the dewatering tank is stopped by detecting a slight abnormal vibration before the dewatering tank rotates at high speed, and the dewatering tank is gradually stopped if the dewatering tank vibrates abnormally during high speed rotation. The present invention relates to a washing machine equipped with an abnormal vibration prevention mechanism.

[0002]

2. Description of the Related Art Conventionally, in a so-called fully automatic washing machine, washing and dewatering of laundry are carried out in a common tub. If it is biased, the tank will vibrate abnormally and collide with or deform the outer box. Therefore, when abnormal vibration occurs, the abnormality is detected and the tank is braked to stop. FIG. 14 shows Japanese Patent Laid-Open No. 3-280994.
It is a longitudinal cross-sectional view which shows an example of the conventional fully automatic washing machine disclosed by the publication. 1 is an outer box of the washing machine, 2 is a lid, 3 is an outer box 1
An outer tub provided inside 4 is a wire for suspending and fixing the outer tub 3 from the outer box 1, and 5 is a dehydrating tub provided inside the outer tub 3. Reference numeral 6 is a motor, 7 is a mechanism portion for generating torque by lowering the rotation speed of the motor 6, and 8 is a rotation stopping means for stopping the rotation of the dehydration tank 5. Reference numeral 9 is an abnormal vibration detecting means for detecting an abnormal vibration of the outer tub 1, and 10 is a control means for controlling the operation of the rotation stopping means 8 and the current supplied to the motor 6 according to the signal received from the abnormal vibration detecting means 9.

The operation of the fully automatic washing machine configured as described above will be described. Usually, laundry is put in the dehydration tub 5 and the dehydration tub 5 is rotated for dehydration. However, when the dehydration tub 5 rotates, if the laundry is largely deviated in the dehydration tub 5, an imbalance occurs in the balance, and the dehydration tub 5 and the outer tub 3 vibrate abnormally. In this way, when the width of the vibration becomes large, the outer tank 3 comes into contact with the abnormal vibration detection means 9 to turn on the switch, and the control means 10 linked to this switch operates the rotation stopping means 8 to apply the brake to release the vibration. Stop the rotation of the water tank 5. Similarly, the control means 10 linked with the abnormal vibration detection means 9 shuts off the current supplied to the motor 6.

[0004]

According to the conventional fully automatic washing machine constructed as described above, the abnormal vibration of the dehydration tub 5 is detected by the safety switch. Abnormal vibration could not be detected unless the water tank 5 rotated at high speed and the amplitude of vibration became considerably large. In addition, when abnormal vibration is detected, the rotation stopping means 8 immediately applies a full brake to make a sudden stop. Since abnormal vibration occurs, there was no problem with the conventional stopping method. However, when washing something waterproof such as a windbreaker or a wetsuit, as the spin-drying tub 5 rotates, the water in the spin-drying tub 5 is trapped in the laundry and a plastic bag containing just water is used. It will be in the same state as it was put. If the dehydration tank 5 is continuously rotated in this state, a lump of water will be formed.
Since it is pressed against a part of the water, the balance in the dehydration tank 5 gradually becomes unbalanced. However, since the vibration cannot be detected by the safety switch, the brake of the rotation stopping means 8 does not work, and the abnormal vibration is detected only at high speed rotation. Therefore, there is a problem in that the motor 6 is rapidly braked while the motor 6 is rotating at a high speed, and the repulsive force of the rotary motion causes the entire washing machine to shake greatly or to fall down depending on the installation conditions. Although Japanese Patent Laid-Open No. 4-97778 discloses a dehydrator control device, it does not sufficiently solve the above problems.

The present invention has been made to solve the above problems, and detects abnormal vibrations of the dehydration tub with high precision, and the laundry pieces in the dehydration tub before the dehydration tub rotates at high speed. An object of the present invention is to obtain a washing machine provided with an abnormal vibration prevention mechanism capable of detecting a deviation. Another object of the present invention is to obtain a washing machine equipped with an abnormal vibration prevention mechanism that can perform a brake operation according to the rotation speed of a motor when abnormal vibration is detected.

[0006]

A washing machine provided with an abnormal vibration preventing mechanism according to the present invention is configured as follows. (1) A tub for washing and dehydrating laundry, a motor for rotating the tub, a rotation stopping means for stopping the rotation of the tub, and the like. When abnormal vibration is detected while the tub is rotating, the rotation stopping means A washing machine equipped with an abnormal vibration prevention mechanism for stopping the rotation of a tub by a pulse signal generating means for generating a pulse signal according to a rotation cycle of a motor shaft, and a waveform of a pulse signal from the pulse signal generating means. When the waveform of the pulse signal detected by the waveform detection means for detecting, the rotation stop control means for controlling the rotation stop means, the motor control means for controlling the current supplied to the motor, and the waveform detection means changes,
The rotation stopping means is operated and an abnormal vibration preventing mechanism including signal processing means for cutting off the current to the motor is provided.

(2) A tub for washing and dehydrating laundry,
Equipped with an abnormal vibration prevention mechanism that consists of a motor that rotates the tank and rotation stop means that stops the rotation of the tank, and that stops rotation of the tank by the rotation stop means when abnormal vibration is detected while the tank is rotating. And a pulse signal generating means for generating a pulse signal according to the rotation cycle of the motor shaft,
Waveform detection means for detecting the waveform of the pulse signal from the pulse signal generation means, rotation speed detection means for detecting the rotation speed of the tank by the pulse signal from the pulse signal generation means, rotation stop control means for controlling the rotation stop means, motor When the cycle of the pulse signal detected by the motor control means that controls the current supplied to the motor and the waveform detection means changes, the rotation stop means is activated, and at the same time, the rotation speed of the tank detected by the rotation speed detection means rotates at high speed. In this case, the rotation stopping means is gradually operated, and an abnormal vibration preventing mechanism including signal processing means for interrupting the current to the motor at the same time as any of the above operations is provided.

(3) A tub for washing and dehydrating laundry,
Equipped with an abnormal vibration prevention mechanism that consists of a motor that rotates the tank and rotation stop means that stops the rotation of the tank, and that stops rotation of the tank by the rotation stop means when abnormal vibration is detected while the tank is rotating. A washing machine, the waveform detecting means for detecting the current waveform input to the motor, the rotation stop controlling means for controlling the rotation stopping means, the motor controlling means for controlling the current supplied to the motor, and the waveform detecting means When the amplitude of the input current changes, the rotation stopping means is operated, and the abnormal vibration preventing mechanism including the signal processing means for shutting off the current to the motor is provided.

(4) A tub for washing and dehydrating laundry,
Equipped with an abnormal vibration prevention mechanism that consists of a motor that rotates the tank and rotation stop means that stops the rotation of the tank, and that stops rotation of the tank by the rotation stop means when abnormal vibration is detected while the tank is rotating. In the washing machine, the waveform detection means for detecting the current waveform input to the motor, the rotation speed detection means for detecting the rotation speed of the tub, the rotation stop control means for controlling the rotation stop means, and the current supplied to the motor are When the amplitude of the input current detected by the motor control means for controlling and the waveform detection means changes, the rotation stop means is operated, and at the same time, when the rotation speed of the tank detected by the rotation speed detection means is high speed rotation rotation means. Is gradually operated, and an abnormal vibration prevention mechanism including signal processing means for interrupting the current to the motor simultaneously with any one of the operations is provided.

(5) A tub for washing and dehydrating laundry,
Equipped with an abnormal vibration prevention mechanism that consists of a motor that rotates the tank and rotation stop means that stops the rotation of the tank, and that stops rotation of the tank by the rotation stop means when abnormal vibration is detected while the tank is rotating. In the washing machine, the abnormal vibration detecting means for detecting the occurrence of abnormal vibration in the tub, the pulse signal generating means for generating a pulse signal according to the rotation cycle of the motor shaft, the pulse signal from the pulse signal generating means When abnormal rotation of the tank is detected by rotation speed detection means for detecting the rotation speed of the tank, rotation stop control means for controlling the rotation stop means, motor control means for controlling the current supplied to the motor, and abnormal vibration detection means When the rotation speed of the tank detected by the rotation speed detection means is high, the rotation stop means is gradually operated, and at the same time as any of the above operations, the rotation stop means is operated. Those with abnormal vibration prevention mechanism comprising a signal processing means for interrupting the current to the motor.

[0011]

[Action]

(1) When the waveform detecting means detects the change in the waveform of the pulse signal from the pulse signal generating means and detects the eccentricity of the tank, the signal processing means receives the signal to that effect and sends a signal to the rotation stop control means. The rotation stop means is operated and a signal is sent to the motor control means to cut off the current to the motor.

(2) When the waveform detecting means detects the change in the waveform of the pulse signal from the pulse signal generating means and detects the eccentricity of the tank, the signal processing means receives the signal to that effect and sends a signal to the rotation stop control means. To operate the rotation stopping means. At this time, when the signal processing means simultaneously receives a signal indicating that the rotation speed is high, the rotation stopping means is gradually operated. Further, at the same time as any of the above operations, a signal is sent to the motor control means to cut off the current to the motor.

(3) When the waveform detecting means detects a change in the amplitude of the input current input to the motor to detect the eccentricity of the tank, the signal processing means receives a signal to that effect and sends a signal to the rotation stop control means. Is sent to operate the rotation stop means, and at the same time, a signal is sent to the motor control means to cut off the current to the motor.

(4) When the waveform detecting means detects a change in the amplitude of the input current input to the motor to detect the eccentricity of the tank, the signal processing means receives a signal to that effect and sends a signal to the rotation stop control means. To operate the rotation stopping means. At this time, when the signal processing means simultaneously receives a signal indicating that the rotation speed is high, the rotation stopping means is gradually operated. Further, at the same time as any of the above operations, a signal is sent to the motor control means to cut off the current to the motor.

(5) When the signal processing means receives from the abnormal vibration detection means a signal indicating that there is abnormal vibration, it sends a signal to the rotation stop control means to operate the rotation stop means.
At this time, when the signal processing means simultaneously receives a signal indicating that the rotation speed is high, the rotation stopping means is gradually operated. Furthermore, at the same time as one of the above operations,
A signal is sent to the motor control means to shut off the current to the motor.

[0016]

【Example】

Embodiment 1 FIG. 1 is a vertical sectional view of a first embodiment of the present invention, and FIG. 2 is a block diagram showing a control means of an abnormal vibration prevention mechanism. 1 is an outer box of the washing machine, 2 is a lid, 3 is an outer tub provided in the outer box 1,
4 is a wire for suspending and fixing the outer tub 3 from the outer box 1
Is a dehydration tank provided in the outer tank 3. 6 is a motor, 7
Is a mechanism unit that generates torque by lowering the rotation speed of the motor 6, and 8 is a rotation stopping unit that stops the rotation of the dehydration tank 5. Reference numeral 11 is a pulse signal generating means for generating a pulse signal in synchronization with the rotation cycle of the motor 6.

Reference numeral 12 is a waveform detection means for detecting the waveform of the pulse signal generated by the pulse signal generation means 11, 13 is a rotation stop control means for controlling the operation of the rotation stop means 8, 1
Reference numeral 4 is a motor control means for controlling the current supplied to the motor 6. Reference numeral 15 is a signal processing means for inputting a signal from the waveform detection means 12 and controlling the rotation stop control means 13 and the motor control means 14. Reference numeral 10 is composed of a waveform detection means 12, a rotation stop control means 13, a motor control means 14 and a signal processing means 15. The signal received from the pulse signal generation means 11 indicates the operation of the rotation stop means 8 and the current supplied to the motor 6. It is a control means for controlling.

FIG. 3 is a plan view showing an example of the pulse signal generating means 11. Reference numeral 16 is a fixed disk portion which constitutes the pulse signal generating means 11, and the shaft 6a of the motor 6 is loosely fitted therein. Reference numeral 17 denotes an S-pole magnet attached to the motor shaft 6a and rotating together with the motor shaft 6a, and 18a, 18b, 18c, 18
Reference numeral d denotes N-pole magnets attached at four regular intervals around the disk portion 16.

The operation of the embodiment constructed as described above will be described. When the motor 6 is driven to rotate the dehydration tank 5 in the dehydration step, the motor shaft 6a rotates and the S pole magnet 17 also rotates, so that the distance from the N pole magnet 18 changes. The N-pole magnets 18 are arranged at equal intervals around the motor shaft 6a.
Since the motor pole 6a is provided individually, the S-pole magnetic pole 17 approaches the respective N-pole magnetic poles 18a, 18b, 18c, 18d four times while the motor shaft 6a makes one rotation in the arrow direction. As a result, a current is generated by electromagnetic induction, and when this current is digitized, the pulse signal shown in FIG. 4 is obtained. At this time, if any imbalance occurs in the dehydration tank 5, the dehydration tank 5 may have uneven rotation. Since this rotation unevenness also affects the rotation of the motor shaft 6a, the waveform of the pulse signal changes as shown in FIG.

The waveform of this signal is always detected by the waveform detecting means 12, and when a change in the signal is detected,
A signal to that effect is sent to the signal processing means 15. When the signal processing means 15 receives the signal from the waveform detection means 12, it controls the rotation stop control means 13 to operate the rotation stop means 8. At the same time, the motor control means 14 is controlled to cut off the current to the motor 6. In this way, the rotation of the dehydration tank 5 is stopped. As described above, according to the present embodiment, since abnormal vibration can be detected before the dehydration tank 5 rotates and the amplitude increases, even if the rotation stopping means 8 is operated to suddenly stop the rotation of the dehydration tank 5. Therefore, it is possible to prevent the washing machine as a whole from shaking significantly due to the repulsive force of the rotary motion, or falling down depending on the installation conditions.

Embodiment 2 FIG. 6 is a block diagram of a second embodiment of the present invention. First
In the embodiment described above, the signal was inputted to the signal processing means 15 only from the waveform detecting means 12, but in the present embodiment, the rotation speed detecting means 19 is further provided and the dehydration tank is caused by the signal issued from the pulse signal generating means 11. The rotation speed of 5 is detected, and this rotation speed is input to the signal processing means 15. Then, if abnormal vibration is detected during high speed rotation, the signal processing means 15 indicates that the dehydration tank 5 is at high speed rotation speed detecting means 1.
When the rotation stop control means 13 controls the rotation stop means 8, the rotation stop means 8 is made to operate gradually when the rotation stop control means 13 controls the rotation stop means 8. On the other hand, when it is determined that the rotation of the dehydration tank 5 is low when the signal generated from the rotation speed detection means 19 is input to the signal processing means 15, the control is performed in the same manner as in the case of the first embodiment. It In this way, abnormal vibration can be prevented more safely.

Third Embodiment FIG. 7 is a vertical sectional view of a third embodiment of the present invention, and FIG. 8 is a block diagram showing a control means of an abnormal vibration prevention mechanism. 1 is an outer box of the washing machine, 2 is a lid, 3 is an outer tub provided in the outer box 1,
4 is a wire for suspending and fixing the outer tub 3 from the outer box 1
Is a dehydration tank provided in the outer tank 3. 6 is a motor, 7
Is a mechanism unit that generates torque by lowering the rotation speed of the motor 6, and 8 is a rotation stopping unit that stops the rotation of the dehydration tank 5.

Reference numeral 12 is a waveform detecting means for detecting an input current waveform to the motor 6, 13 is a rotation stop control means for controlling the operation of the rotation stop means 8, and 14 is a motor control means for controlling a current supplied to the motor 6. is there. 15 is a waveform detection means 1
It is a signal processing means for controlling the rotation stop control means 13 and the motor control means 14 by inputting the signal from the signal No. 2. Reference numeral 10 is composed of a waveform detection means 12, a rotation stop control means 13, a motor control means 14 and a signal processing means 15. The signal received from the pulse signal generation means 11 indicates the operation of the rotation stop means 8 and the current supplied to the motor 6. It is a control means for controlling.

The operation of this embodiment configured as described above will be described. When entering the dehydration process, the motor 6 rotates to rotate the dehydration tank 5. Here, the current input to the motor 6 has a constant amplitude and cycle, as shown in FIG. However, if a slight imbalance occurs inside the dehydration tank 5, uneven rotation of the dehydration tank 5 will occur. Since this rotation unevenness also affects the motor 6, the waveform of the input current changes, for example, as shown in FIG. The waveform of this input current is always detected by the waveform detection means 12, and when a change in the waveform of the input current is detected, a signal to that effect is sent to the signal processing means 15. When the signal processing means 15 receives the signal from the waveform detecting means 12, it controls the rotation stop controlling means 13 to operate the rotation stopping means 8. At the same time, the motor control means 14 is controlled to control the motor 6
Cut off the current to the. In this way, the rotation of the dehydration tank 5 is stopped.

As described above, in the present embodiment, the abnormal vibration can be detected before the dehydration tank 5 rotates and the amplitude becomes large. Therefore, even if the rotation stopping means 8 is operated to make a sudden stop, It is possible to prevent the washing machine as a whole from shaking significantly due to the repulsive force of the rotary motion, or falling down depending on the installation conditions.

Fourth Embodiment FIG. 11 is a block diagram of the fourth embodiment of the present invention. In the third embodiment, the signal is inputted to the signal processing means 15 only from the waveform detecting means 12, but in the present embodiment, the rotation speed detecting means 19 is further provided and the signal indicating the rotation speed of the dehydration tank 5 is also provided. Input to the signal processing means 15. Then, if abnormal vibration is detected during high-speed rotation, the signal processing means 1
5 is a rotation speed detecting means 19 indicating that the dehydration tank 5 is rotating at high speed.
When the rotation stop control means 13 controls the rotation stop means 8, the rotation stop means 8 is gradually operated. On the other hand, when the signal generated from the rotation speed detection means 19 is input to the signal processing means 15, the dehydration tank 5
When it is determined that the rotation speed is low, the control is performed in the same manner as in the third embodiment. In this way, abnormal vibration can be prevented more safely.

Embodiment 5 FIG. 12 is a vertical sectional view of a fifth embodiment of the present invention, and FIG. 13 is a block diagram showing the control means in the abnormal vibration prevention device. 1 is an outer box of a washing machine, 2 is a lid, 3 is an outer tub provided in the outer box 1, 4 is a wire for suspending and fixing the outer tub 3 from the outer box 1, and 5 is provided in the outer tub 3. It is a dehydration tank. Reference numeral 6 is a motor, 7 is a mechanism portion for generating torque by lowering the rotation speed of the motor 6, and 8 is a rotation stopping means for stopping the rotation of the dehydration tank 5. Reference numeral 9 is an abnormal vibration detecting means for detecting an abnormal vibration of the outer tub 3, and 11 is a pulse signal generating means for generating a pulse signal in synchronization with the rotation cycle of the motor 6.

Reference numeral 19 is a rotation speed detection means for detecting the rotation speed of the dehydration tank 5 by a pulse signal generated from the pulse signal generation means 11, 13 is a rotation stop control means for controlling the operation of the rotation stop means 8, and 14 is a motor 6 The motor control means controls the current supplied to the motor. 15 is an abnormal vibration detection means 9
And a signal processing means for controlling the rotation stop control means 13 and the motor control means 14 by inputting a signal from the rotation speed detection means 19. Reference numeral 10 is composed of a rotation speed detection means 19, a rotation stop control means 13, a motor control means 14 and a signal processing means 15. The operation of the rotation stop means 8 and the electric current supplied to the motor 6 according to the signal received from the abnormal vibration detection means 9 are performed. Is a control means for controlling.

The operation of this embodiment configured as described above will be described. When entering the dehydration process, the dehydration tank 5 starts to rotate.
Here, if an imbalance occurs in the dehydration tub 5 due to a deviation of the laundry or the like, abnormal vibration occurs and the dehydration tub 5 and the outer tub 1 swing about the rotation axis. When this swing exceeds a certain width, the outer tub 1 touches the abnormal vibration detection means 9 and an abnormal vibration detection signal is generated. When the signal processing means 15 receives the signal from the abnormal vibration detection means 9 and determines that the dehydration tank 5 is rotating at high speed by the signal issued from the rotation speed detection means 19, the rotation stop control means 13 The rotation stop means 8 is gradually operated, and when it is determined that the rotation speed is rotating at a low speed based on the signal output from the rotation speed detection means 19, the rotation stop control means 13 immediately causes the rotation stop means 8 to operate. To do so. at the same time,
By controlling the motor control unit 14 to cut off the supply of the electric current to the motor 6, the rotation of the dehydration tank 5 is stopped.

As described above, in the present embodiment, when abnormal vibration is detected when the dehydration tank 5 is rotated at a high speed, the rotation stop control means 13 controls the rotation stop means 8 to gradually operate to rotate the rotation stop means 8. It is possible to prevent the washing machine from shaking significantly due to the repulsive force of the exercise, or falling down depending on the installation conditions.

[0031]

As is apparent from the above description, according to the present invention, the following effects can be obtained. In addition,
In the explanation, the same number as the claim number is attached to describe the effect of each claim. (1) Pulse signal generation means for generating a pulse signal according to the rotation cycle of the motor shaft, waveform detection means for detecting the waveform of the pulse signal from the pulse signal generation means, rotation stop control means for controlling the rotation stop means, motor When the waveform of the pulse signal detected by the waveform detection means changes, the motor control means that controls the current supplied to the motor, the rotation stop means is operated, and the signal processing means that shuts off the current to the motor causes abnormal vibration. Configured the prevention mechanism. With this configuration, when abnormal vibration occurs during dehydration, the abnormal vibration of the tank can be detected before the amplitude becomes large by detecting the change in the waveform of the pulse signal from the pulse signal generating means. Therefore, even if the rotation stop means is operated to suddenly stop the tub, the repulsive force of the rotary motion causes the entire washing machine to shake greatly,
It can be prevented from falling down depending on the installation conditions.

(2) Pulse signal generating means for generating a pulse signal according to the rotation cycle of the motor shaft, waveform detecting means for detecting the waveform of the pulse signal from the pulse signal generating means,
Rotation speed detection means for detecting the rotation speed of the tank by the pulse signal from the pulse signal generation means, rotation stop control means for controlling the rotation stop means, motor control means for controlling the current supplied to the motor, and detection by the waveform detection means When the cycle of the pulse signal is changed, the rotation stopping means is operated, and at the same time, when the rotation speed of the tank detected by the rotation speed detecting means is high speed, the rotation stopping means is gradually operated, and further, any one of the above. An abnormal vibration prevention mechanism is composed of a signal processing means for cutting off the current to the motor at the same time as the operation. With this configuration, even if abnormal vibration occurs during dehydration, the abnormal vibration of the tank can be detected before the amplitude becomes large by detecting the change in the waveform of the pulse signal from the pulse signal generating means. Therefore, even if the rotation stopping means is operated to make a sudden stop, it is possible to prevent the entire washing machine from swaying greatly due to the repulsive force of the rotating motion or falling down depending on the installation conditions. Also, when abnormal vibration of the tank is detected, the rotation stop means is controlled to be gradually operated by the signal from the rotation speed detection means when the tank is rotating at a high speed. Even if it is stopped, it is possible to prevent the entire washing machine from swaying greatly due to the repulsive force of the rotary motion, or falling down depending on the installation conditions, and it is possible to obtain a safer abnormal vibration prevention mechanism.

(3) The waveform detection means for detecting the current waveform input to the motor, the rotation stop control means for controlling the rotation stop means, the motor control means for controlling the current supplied to the motor, and the waveform detection means. When the amplitude of the input current changes, the rotation stopping means is operated, and the abnormal vibration preventing mechanism is composed of the signal processing means for cutting off the current to the motor. With this configuration, even if abnormal vibration occurs during dehydration, abnormal vibration of the tank can be detected before the amplitude increases by detecting the change in the current waveform input to the motor. Even if the rotation stopping means is operated to make a sudden stop, it is possible to prevent the washing machine from swaying greatly due to the repulsive force of the rotating motion or falling down depending on the installation conditions.

(4) Waveform detection means for detecting the current waveform input to the motor, rotation speed detection means for detecting the rotation speed of the tank, rotation stop control means for controlling the rotation stop means, and control of the current supplied to the motor When the amplitude of the input current detected by the motor control means and the waveform detection means changes, the rotation stop means is operated, and at the same time, when the rotation speed of the tank detected by the rotation speed detection means is high speed, the rotation stop means is operated. An abnormal vibration preventing mechanism is constituted by a signal processing means for gradually operating and further interrupting the current to the motor at the same time as any of the above operations. With this configuration, even if abnormal vibration occurs during dehydration, abnormal vibration of the tank can be detected before the amplitude increases by detecting the change in the current waveform input to the motor. Even if the rotation stopping means is operated to make a sudden stop, it is possible to prevent the washing machine from swaying greatly due to the repulsive force of the rotating motion or falling down depending on the installation conditions. Also, when abnormal vibration of the tank is detected, the rotation stop means is controlled to be gradually operated by the signal from the rotation speed detection means when the tank is rotating at a high speed. Even if it is stopped, it is possible to prevent the entire washing machine from shaking significantly due to the repulsive force of the rotary motion, or falling down depending on the installation conditions, and it is possible to obtain a safer abnormal vibration prevention function.

(5) Abnormal vibration detection means for detecting the occurrence of abnormal vibration in the tank, pulse signal generating means for generating a pulse signal according to the rotation cycle of the motor shaft, and pulse signals from the pulse signal generating means When the abnormal vibration of the tank is detected by the rotation speed detection means for detecting the rotation speed of the, the rotation stop control means for controlling the rotation stop means, the motor control means for controlling the current supplied to the motor, and the abnormal vibration detection means, A signal for activating the rotation stopping means and, at the same time, gradually operating the rotation stopping means when the number of rotations of the tank detected by the rotation number detecting means is high speed, and further interrupting the current to the motor at the same time as any of the above operations. An abnormal vibration prevention mechanism was constructed from the processing means. With this configuration, when abnormal vibration occurs during dehydration, the abnormal vibration of the tank can be detected by the abnormal vibration detection means before the amplitude becomes large. Even so, it is possible to prevent the entire washing machine from swaying greatly due to the repulsive force of the rotary motion or falling down depending on the installation conditions. When abnormal vibration of the tank is detected, the rotation stop means is controlled so that the rotation stop means is gradually operated by the signal from the rotation speed detection means when the tank is rotating at high speed. Even if it is done, it is possible to prevent the entire washing machine from shaking significantly due to the repulsive force of the rotary motion, or falling down depending on the installation conditions.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a block diagram of a first embodiment of the present invention.

FIG. 3 is a plan view showing a main part of the first embodiment of the present invention.

FIG. 4 is a pulse signal waveform diagram at a normal time in the first embodiment of the present invention.

FIG. 5 is a pulse signal waveform diagram at the time of abnormality in the first embodiment of the present invention.

FIG. 6 is a block diagram of a second embodiment of the present invention.

FIG. 7 is a vertical sectional view of a third embodiment of the present invention.

FIG. 8 is a block diagram of a third embodiment of the present invention.

FIG. 9 is a motor input current waveform diagram at a normal time in the third embodiment of the present invention.

FIG. 10 is a motor input current waveform diagram at the time of abnormality in the third embodiment of the present invention.

FIG. 11 is a block diagram of a fourth embodiment of the present invention.

FIG. 12 is a vertical sectional view of a fifth embodiment of the present invention.

FIG. 13 is a block diagram of a fifth embodiment of the present invention.

FIG. 14 is a vertical sectional view showing an example of a conventional fully automatic washing machine.

[Explanation of symbols]

5 dehydration tank, 6 motor, 8 rotation stop means, 9 abnormal vibration detection means, 10 control means, 11 pulse signal generation means, 12 waveform detection means, 13 rotation stop control means, 1
4 motor control means, 15 signal processing means, 19 rotational speed detection means.

Claims (5)

[Claims] 1. A tub for washing and dehydrating laundry, a motor for rotating the tub, a rotation stopping means for stopping the rotation of the tub, etc., and abnormal vibration is detected while the tub is rotating. Then, in a washing machine equipped with an abnormal vibration prevention mechanism for stopping the rotation of the tub by the rotation stopping means, a pulse signal generating means for generating a pulse signal according to the rotation cycle of the motor shaft, from the pulse signal generating means Waveform detection means for detecting the waveform of the pulse signal of, the rotation stop control means for controlling the rotation stop means, the motor control means for controlling the current supplied to the motor, and the waveform of the pulse signal detected by the waveform detection means When the change occurs, the rotation stopping means is operated, and the abnormal vibration preventing mechanism including a signal processing means for shutting off the current to the motor is provided. Machine. 2. A tub for washing and dehydrating laundry, a motor for rotating the tub, a rotation stopping means for stopping the rotation of the tub, etc., and abnormal vibration is detected while the tub is rotating. Then, in a washing machine equipped with an abnormal vibration prevention mechanism for stopping the rotation of the tub by the rotation stopping means, a pulse signal generating means for generating a pulse signal according to the rotation cycle of the motor shaft, from the pulse signal generating means Waveform detecting means for detecting the waveform of the pulse signal of, rotation speed detecting means for detecting the rotation speed of the tank by the pulse signal from the pulse signal generating means, rotation stop control means for controlling the rotation stop means, the motor When the cycle of the pulse signal detected by the motor control means for controlling the current to be supplied and the waveform detection means changes, the rotation stop means is operated, and at the same time the rotation speed is changed. When the number of rotations of the tank detected by the detection means is high-speed rotation, the rotation stopping means is gradually operated, and further, at the same time as any of the above operations, the signal processing means for shutting off the current to the motor is prevented. A washing machine having a mechanism. 3. A tub for washing and dehydrating laundry, a motor for rotating the tub, a rotation stopping means for stopping the rotation of the tub, etc., and abnormal vibration is detected while the tub is rotating. Then, in a washing machine having an abnormal vibration prevention mechanism for stopping the rotation of the tub by the rotation stopping means or the like, a waveform detecting means for detecting a current waveform input to the motor, a rotation stop for controlling the rotation stopping means Control means, motor control means for controlling the current supplied to the motor, and when the amplitude of the input current detected by the waveform detection means changes, the rotation stop means is operated and the current to the motor is cut off. A washing machine comprising an abnormal vibration prevention mechanism including: 4. A tub for washing and dehydrating laundry, a motor for rotating the tub, a rotation stopping means for stopping the rotation of the tub, etc., and abnormal vibration is detected while the tub is rotating. Then, in a washing machine equipped with an abnormal vibration prevention mechanism for stopping the rotation of the tub by the rotation stopping means or the like, a waveform detection means for detecting a current waveform input to the motor, a rotation for detecting the number of rotations of the tub Number detection means, rotation stop control means for controlling the rotation stop means, motor control means for controlling the current supplied to the motor, and the rotation stop means when the amplitude of the input current detected by the waveform detection means changes When the number of rotations of the tank detected by the number-of-rotations detecting means is high, the rotation stopping means is gradually operated, and at the same time as any one of the above-mentioned operations, the motor is turned on. Washing machine characterized by comprising a signal processing means is interrupted, abnormal vibration preventing mechanism consisting of. 5. A tub for washing and dehydrating laundry, a motor for rotating the tub, a rotation stopping means for stopping the rotation of the tub, etc., and abnormal vibration is detected while the tub is rotating. Then, in a washing machine equipped with an abnormal vibration prevention mechanism for stopping the rotation of the tub by the rotation stopping means or the like, an abnormal vibration detecting means for detecting the occurrence of abnormal vibration in the tub, depending on the rotation cycle of the motor shaft Pulse signal generating means for generating a pulse signal, a rotation speed detecting means for detecting the rotation speed of the tank by a pulse signal from the pulse signal generating means, a rotation stop controlling means for controlling the rotation stopping means, and a supply to the motor When the abnormal vibration of the tank is detected by the motor control means for controlling the current to be generated and the abnormal vibration detection means, the rotation stop means is operated and at the same time detected by the rotation speed detection means. When the rotation speed of the tank is high, the rotation stopping means is gradually operated, and further, the signal processing means for interrupting the current to the motor at the same time as any of the above operations, is provided with an abnormal vibration prevention mechanism. A washing machine characterized by that.