JPH0420640B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a dehydrating operation method for a washing machine.

[Conventional technology]

As is well known, dewatering in a washing machine is carried out by rotating the dehydration tank, but if the laundry inside is shifted to one side, the machine rotates eccentrically and irregularly, causing large vibrations and noise. In particular, the fully automatic type has a larger dehydration tank compared to the two-tank type, so this vibration and noise are large.In order to reduce this even a little, a balancer is installed at the top opening of the dehydration tank to make the dehydration tank as small as possible. I am trying to perform horizontal rotation.

[Problem that the invention seeks to solve]

As mentioned above, conventional washing machines are equipped with a balancer to perform horizontal rotation, but even this is insufficient, and there has therefore been a strong social demand for reductions in vibration and noise.

[Purpose of the invention]

Therefore, an object of the present invention is to eliminate the disadvantages of the conventional example, prevent the occurrence of imbalance, and
An object of the present invention is to provide a dehydrating operation method for a washing machine that enables lower vibration and noise.

[Means for solving problems]

In order to achieve the above object, the present invention provides a rotation speed detection means for detecting the rotation speed of the drive motor 8, and uses the output from this rotation speed detection means to detect the rotation speed of the drive motor 8.
At the initial stage of the dehydration process, the gist is to repeat multiple times the operation of temporarily stopping the power supply to the drive motor when the dehydration tank reaches a certain low rotational speed below the resonance point.

[Effect]

According to the present invention, at the initial stage of the dehydration process, the dehydration tank is intermittently driven to rotate at a low speed with an upper limit of the rotation speed below the resonance point that it touches the most.As a result, the rotation speed of the dehydration tank is does not exceed the resonance point, does not cause large vibrations, and can prevent unbalance from occurring. Additionally, during this time, some of the water in the laundry is removed from the laundry in the tub, making it lighter in weight, so even if the process progresses and full-scale dewatering is performed at high speed, eccentric loads are less likely to be applied and vibrations are less likely to occur.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an operation explanatory diagram showing the operating method of the present invention;
FIG. 2 is a longitudinal sectional side view of a washing machine that carries out this process.

As an example, the washing machine is a fully automatic agitation type washing machine, and 1 in the figure is an agitator which has vertical agitation blades 3 radially arranged around a hollow cylindrical body having a large number of through holes 2; 4 is this agitator 1
is located at the center and has a through hole 5 in its side wall, and a balancer 6 using a hollow wheel is formed at its upper opening. Reference numeral 7 denotes a water receiving tank provided outside the dewatering tank 4, and although not shown, this is provided with a drain port to which a drain pipe is connected.

In the figure, 8 is the motor, which is the pulley 9, V
It is connected to a rotation transmission section 12 via a belt 10 and a deceleration transmission mechanism of a pulley 11. The rotation transmission section 12 has double drive shafts 12a and 12b that are switched by a spring clutch mechanism 13, and the outer drive shaft 12a is connected to the dehydration tank 4, and the inner drive shaft 12
b are respectively coupled to the agitator 1.

A rotation speed detection means 14 for detecting the rotation speed of the motor 8 is attached to the motor 8. As this rotation speed detection means 14, a speed generator using a power generating mechanism was used, but as another means, a rotary plate having a detection hole was attached to the shaft of the motor 8, and this and a light emitting part,
It is also conceivable to combine a U-shaped angle detector with a light receiving section.

Although not shown in the drawings, all of these mechanisms are housed inside the exterior via vibration isolating means, and an operating section containing a control device 15 using a microcomputer and operation switches is provided on the upper part of the exterior.

As shown in FIG. 3, this control device 15 includes a central processing unit (CPU) 15a, a ROM 15
b, a RAM 15c, and an input/output control circuit 15d, and the rotation speed detection means (speed generator) 14
and other detectors such as water level detection (not shown)
The output from the control device is introduced into the drive circuit 16 of the motor 8, the valve control circuit for the water supply valve, the drain valve, etc., and other parts (not shown).

Next, the operation of the washing machine configured as above will be explained.

FIG. 4 is a diagram showing a standard washing process of such a washing machine, and the process progresses sequentially from the left side to the right side of the figure. First, in the washing process, the laundry to be washed is stored in the spin-drying tank 4, water and detergent are added, and the power switch is turned on.The motor 8 rotates forward and reverse alternately, and the agitator 1 also swings accordingly. When an operation that takes a certain period of time is performed due to the action of the timer in the control device 15,
The water is drained and the washing process is completed.

Next, the rinsing process begins, and water injection and dehydration and normal rinsing are alternately repeated several times. (The figure shows two repetitions.) Of these, water pouring and dehydration involves discharging detergent-containing water from the laundry while sprinkling fresh water from above.

When the water injection and dehydration process begins, the spring clutch mechanism 1
3 is switched, the shaft 12a begins to rotate together with the shaft 12b, and the motor 8 continuously rotates in only one direction. The motor 8 is energized to rotate the dehydration tank 4 and the agitator 1, but at the initial stage of this water injection and dewatering process, water injection is not yet performed.As shown in FIG. The output from the control device 15
When the motor 8 reaches a rotation speed such that the dehydration tank 4 reaches 300 rotations/minute, which is one-third of the normal high-speed rotation speed of 900 rotations/minute, the control device 15 The motor 8 is stopped for a short time with the output of

Furthermore, the motor 8 is started again, and thereafter the motor 8 is turned on and off about five times so that the rotation of the dehydration tank 4 is no more than 300 revolutions/minute.

This 300 rotations/minute is an upper limit value set because it is below the resonance point at which the dehydration tank 4 swings the most, and the intermittent operation of the dehydration tank at this low speed rotation is called balance rotation.

Since the balance is below the resonance point during balance rotation, it is difficult for the laundry to be unbalanced, and even if it does occur, it should be corrected immediately to prevent unbalance from occurring and prevent eccentricity that would cause loud noises or vibrations. Not easy to rotate. Approximately 30% of the water contained in the laundry is removed during this balance rotation, reducing the load.

Next, high-speed rotation starts, water injection starts again, and the motor 8 is operated continuously, so that the rotation speed of the dehydration tank 4 increases.
The speed increases until it reaches 900 rpm. Even when such high-speed rotation begins, noise and vibration due to eccentricity are less likely to occur because the water content of the laundry is reduced during the balance rotation.

This balance rotation is similarly performed at the initial stage after the rinsing process is completed and the final dehydration process is started.

This balance rotation operation will be explained in more detail based on the flowchart of FIG.

In FIG. 5, when the motor 8 starts to be energized, the CPU 15a receives a signal from the speed generator 14 via the input/output control circuit 15d, and the rotation speed of the dehydration tank reaches 300 rpm. It is determined whether the signal has become a signal representing (step S11). This determination is repeated as long as the signal is less than 300 revolutions/minute, and when it reaches 300 revolutions/minute, the process moves to the next step (S12).

In step (S12), power supply to the motor 8 is stopped for a predetermined short time. As a result, the rotation of the motor 8 is temporarily reduced as shown in FIG.

In the next step (S13), it is determined whether the energization cutoff time of the motor 8 has reached a predetermined time. When a predetermined time has elapsed, the process moves to the next step (S14).

In step (S14), it is confirmed how many times the motor 8 has been energized and cut off, and the motor 8 is repeatedly energized and cut off until the number of times reaches a predetermined number (for example, 5 times). After repeating this operation a predetermined number of times, the process moves to the next step (S15).

In step (S15), the motor 8 is rotated at high speed to rotate the dehydration tank at 900 rpm as shown in FIG.

In step (S16), the time period during which the high-speed rotation is being performed is confirmed, and when the predetermined time is reached, the high-speed operation is terminated, the dehydration process is completed, and the next process is started.

Dehydration operation including balance rotation is executed by the above-described procedure.

Although the above embodiments have been explained based on a fully automatic agitation type, the method of the present invention can be applied to all types of washing machines that have a dehydrating tank, such as a two-tank type or a pulsator type.

〔Effect of the invention〕

As described above, the washing machine spin-driving operation method of the present invention uses simple means to prevent unbalance during spin-drying, without adding any special equipment or parts, to reduce vibration and reduce vibration. This makes it possible to ensure noisy work and prevent the inconvenience of the dehydration tank stopping midway.

[Brief explanation of drawings]

Fig. 1 is an operation explanatory diagram showing the dehydration operation method of the washing machine of the present invention, Fig. 2 is a vertical cross-sectional side view of main parts of a fully automatic stirring type washing machine that performs the method of the present invention, and Fig. 3 is a schematic diagram of the control device. FIG. 4 is an explanatory diagram showing a normal washing process, and FIG. 5 is a flowchart showing the control operation of the present invention. 1... Agitator, 2... Through hole, 3... Stirring blade, 4... Dehydration tank, 5... Through hole, 6... Balancer, 7... Water receiving tank, 8... Motor, 9, 11
... Pulley, 10 ... V belt, 12 ... Rotation transmission section, 12a, 12b ... Drive shaft, 13 ... Spring clutch mechanism, 14 ... Rotation speed detection means, 15
...Control device, 16...Motor drive circuit.

Claims (1)

[Claims] 1. A rotation speed detection means 14 is provided to detect the rotation speed of the drive motor 8, and the output from the rotation speed detection means 14 is used to detect the rotation speed of the dehydration tank 4 in the initial stage of the dehydration process.
A dehydrating operation method for a washing machine characterized by repeating an operation of temporarily stopping power supply to a drive motor 8 multiple times when the rotation speed reaches a certain low speed below a resonance point.