JPH0515686A - Washing machine - Google Patents

Abstract

PURPOSE:To improve the safety by turning off a tub for washing and dehydration when a safety switch is operated with the washing clothes unbalanced and actuating the brake after the prescribed delay time in a domestic washing machine. CONSTITUTION:When a safety switch 16 is operated with the washing clothes unbalanced during the dehydration process, a motor 6 is turned off immediately, and a tub for washing and dehydration 2 is operated by inertial force. Then, the delay time is provided only for reducing the number of rotations to the extent that the vibration system will not collide with the main body even the brake is actuated. Then, a solenoid 8 is turned off to actuate the brake.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine used in general households.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional dewatering washing machine is provided with a washing / dehydrating tub 2 inside a water tub 1 for storing water at the time of washing. A pulsator 3 for stirring and a large number of small holes 10 for draining water on the side wall.
Is provided. Reference numeral 5 denotes a bearing box, which has a mechanism for transmitting a driving force of a motor 6 and a brake mechanism so as to rotate and drive only the pulsator 3 at the time of washing and the washing tub / dehydrating tub 2 at the time of dewatering. Further, the motor 6 uses the belt 14 and
Driving force is transmitted to the bearing box 5 by the pulley 15.
Reference numeral 8 denotes a drain solenoid, which opens and closes the drain cock 13,
It controls the switching between dehydration and washing and the opening and closing of the brake mechanism of the washing and dehydrating tub 2. FIG. 3 shows a state in which the drain solenoid 8 is turned on and off. 4 is a reinforcing plate,
A water tank 1, a motor 6, a bearing box 5 and the like are provided, and a support rod 9 is provided.
Thus, the suspension 12 and the slider 7 are suspended from the corners of the main body 23. Reference numeral 11 is a balancer provided above the washing tub and the dehydrating tub. At this time, the clothes are rarely evenly distributed inside the washing / dehydrating tub 2, and the dehydration action is carried out with the uneven distribution. , Was a cause of vibration.

A structure supported by a vibration isolating system such as the support rod 9 and the suspension 12 is called a vibration system, and a natural frequency is a component necessarily formed by the vibration system and the vibration isolating system. .. If, during dewatering, the imbalance of the cloth is large and the frequency generated in the vibration system matches the natural frequency, the amplitude of the vibration system becomes extremely large, for example, jumps up and down, or the main body 23. It is in a state called a normal resonance point where it collides with the vehicle or causes the rotary shaft to be damaged at a critical speed. In order to prevent such a phenomenon, when the amplitude of the vibration system is abnormally large, the motor 6 and the drain solenoid 8 are de-energized by the safety switch 16 as shown in the stroke diagram of FIG. The driving force to 2 was released, the brake was applied, and the washing / dehydrating tub 2 was immediately stopped so that there was no danger.

[0004]

However, in the washing machine configured as described above, when the safety switch is actuated, the rotation of the washing / dehydrating tub is stopped and the safety is ensured.
There is a problem that the vibration system collides with the main body, causing a collision sound and a movement of the main body.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to prevent the vibration system from colliding with the main body and the movement of the main body itself when the safety switch is activated, and to stop the vibration safely.

[0006]

In order to achieve the above object, the present invention is to stop the energization of the motor when the safety switch is activated, and after the delay time is provided, stop the energization of the drain solenoid. Therefore, after releasing the driving force to the washing / dehydrating tub, the brake is applied after the inertial rotation is performed for a while.

[0007]

With the above structure, after the safety switch is activated,
The energy consumed by the brake may be small when the washing / dehydrating tub is coasted for a while and the kinetic energy is reduced and then the brake is applied. Therefore,
The reaction force from the bearing box (having the brake mechanism) provided in the vibration system to the vibration system is reduced, and the vibration of the vibration system due to the force is small, and the collision or movement to the main body is eliminated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same parts as those of the conventional example are indicated by the same numbers, and the description thereof will be omitted.

FIG. 1 is a driving process diagram of a dehydration process of a washing machine. In the figure, in the first drainage state, the drainage solenoid 8 is turned on to open the drainage cock 13 to drain the water in the washing / dehydrating tub 2, and after the drainage is finished, the motor 6
Turn on. After that, the motor 6 is turned on and off at intervals of several seconds.
FF and run intermittently to drain water from clothes gradually.
After that, the motor 6 is kept in the ON state to carry out a continuous dehydration operation to dehydrate the clothes, and then only the motor 6 is turned to the OFF state and the washing / dehydrating tub 2 is inertially operated. When the rotation is almost stopped, the drain solenoid 8 Turn off and drain cock 13
And close the brake, and apply the brake to end the dehydration process. During the dehydration process, when the safety switch is activated due to unbalance of clothes, the motor is immediately turned to 0FF.
In this state, the washing / dehydrating tank 2 is operated by inertia. afterwards,
After providing the delay time, the drain solenoid 8 is turned off and the brake is applied. This delay time is set to such a time that the vibration system does not collide with the main body due to the reaction when the rotation speed of the washing / dehydrating tub becomes small and the brake is suddenly stopped. For example, when the rotation speed of the washing / dehydrating tub 2 when the safety switch is activated is relatively high, or
When the volume of clothes is large and the moment of inertia of the whole is large, and when the unbalance of clothes is large,
Set a longer delay time.

[0010]

As described above, according to the present invention, when the safety switch is actuated, the brake is applied after the rotational speed of the washing / dehydrating tub has decreased and the rotational energy has decreased. A large reaction force is not exerted, and the main body is prevented from colliding with the main body and moving by the main body, and even when the unbalance of the clothes is large, it is possible to safely stop without any abnormality.

[Brief description of drawings]

FIG. 1 is an operation process diagram of a dehydration process showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional washing machine

[Fig. 3] State diagram when the drain solenoid is turned on and off

[Fig. 4] Operation process diagram of conventional dehydration process

[Explanation of symbols]

 2 Washing / dehydrating tank 5 Bearing box 6 Motor 8 Drain solenoid 16 Safety switch

Claims (1)

Claims: 1. A safety switch equipped with a safety switch that operates when the clothes are unbalanced due to unbalance of clothes, a motor that drives the washing / dehydrating tub, and a brake that stops the washing / dehydrating tub. A washing machine in which the washing and dehydrating tub is immediately turned off when the switch is activated, after which a delay time is set and then the brake is activated in the previous period.