JPH0345679B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling the operation of a washing machine, particularly to a method for dehydrating the washing machine.

[Conventional technology]

First, the overall structure of the washer will be explained with reference to the longitudinal cross-sectional side view in Fig. 3. The figure shows a fully automatic one-tank stirring type, and 1 in the figure is centered around a hollow cylindrical body with many through holes 2. The agitator 4 is a dewatering tank with the agitator 1 arranged in the center and a through hole 5 in the side wall, and a balancer 6 is formed in the opening at the upper end of the agitator. Ru. 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.

8 in the figure is a motor, which is a pulley 9, V
It is connected to a rotation transmission section 12 via a deceleration transmission mechanism of a belt 10 and 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 1
2b are connected to the agitator 1, respectively. 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 and operation switches is provided at the top of the exterior. The output from other detectors such as water level detection is introduced into this control device, and the output from the control device is also introduced into the drive circuit of the motor 8, the valve control circuit for the water supply valve, the drain valve, etc., and other parts. be done.

In this way, to perform washing, rinsing, and spin-drying operations, put the laundry, water, and detergent into the spin-drying tank 4, turn on the power, and the motor 8 rotates in forward and reverse directions alternately. 1 also oscillates. After the operation takes a certain period of time due to the action of a timer in the control device, the water is drained and the process moves on to the dewatering process.

By the way, when the dewatering process begins, the spring clutch mechanism 13 is switched, the drive shaft 12a starts to rotate together with the drive shaft 12b, and the motor 8
rotates continuously in only one direction. Accordingly, pulley 9, V belt 10, pulley 11, rotation transmission part 1
The rotation speed of the dehydration tank 4 is determined by the reduction ratio of the pulleys 9 and 11, and the rotation speed of the motor 8 is determined by the number of poles. The rotation speed of the induction motor is 900 revolutions per minute, and the dehydration operation is performed at this rotation speed.

[Problem that the invention seeks to solve]

Nowadays, clothes made of wool and thin, delicate textiles called oshiyaregi are often washed in home washing machines. However, even in such a case, with the conventional dehydration operation device, only a uniform rotation speed can be obtained during the entire dehydration period except for startup, and this is a high speed rotation of 900 rotations/min. Items to be washed, such as wool products, are also dehydrated at this rotational speed, and the centrifugal force is too strong, resulting in excessive dehydration, resulting in fabric damage, deformation, wrinkles, etc. Such inconveniences cannot be overcome by shortening the dehydration time or turning on and off the dehydration tank using a timer.

[Purpose of the invention]

An object of the present invention is to eliminate the disadvantages of the conventional example, to enable dewatering operation with low speed rotation, and to selectively select either dehydration operation with high speed rotation or dehydration operation with low speed rotation. Therefore, the present invention provides a dehydrating operation method for a washing machine that can finish washing items such as those made of wool and items made of thin and delicate textile products called oshiyaregi without impairing their texture. There is a particular thing.

[Means to achieve the purpose]

In order to achieve the above object, the present invention connects a frequency converting means to the dehydration tank motor, and the output from the frequency converting means causes the motor to rotate at high speed or about 1/3 to 1/2 of the rotation speed at the high speed rotation. The gist of this is to perform dehydration operation from start to finish at one of several low-speed rotations.

[Effect]

According to the present invention, by inputting a desired rotation speed into the control device at the start of washing, depending on the type of fiber of the laundry object, high-speed rotation is achieved by the output from the control device and the output of the frequency conversion means. Alternatively, the dewatering operation is performed at low speed rotation to obtain a centrifugal force suitable for the items to be washed, and the cloth will not be stained.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the operation control mechanism used in the method of dehydrating a washing machine according to the present invention. Therefore, detailed explanation will be omitted here.

In the figure, 20 is a control device using a microcomputer, etc., which forms the core of the operation control mechanism, 21 is a frequency converter,
Reference numeral 22 indicates an AC clock circuit, and the AC clock circuit 22 includes a transformer 22a, resistors 22b, 22
e, diode 22c, and transistor 22d
The circuit consists of Further, 23 is an operation unit for setting the rotation speed and rotation time of the dehydration tank 4.

In this way, the control device 20 has the operation section 23 and the AC
The output signal from the clock circuit 22 was introduced, and the signal from the control device 20 was introduced into the motor 8 via the frequency converter 21.

Next, to explain the method of controlling the dewatering operation using such an operation control mechanism, when starting washing, first, the operating unit 23 selects the dehydrating rotation speed and time suitable for the material of the laundry to be washed, for example, normal high-speed rotation. Set it to 300 rpm, which is 1/3 of 900 rpm. Similarly to the conventional example, the motor 8 is operated for a certain period of time by the timer action of the control device.
is alternately rotated in forward and reverse directions, the agitator 1 is oscillated to perform a washing operation, and then water is drained and the process proceeds to a dewatering process.

When the dewatering process begins, the spring clutch mechanism 13 switches, the shafts 12b and 12a rotate, and the motor 8
rotates in one direction. Accordingly, pulley 9,
11. The dehydration tank 4 rotates via the V-belt 10 and the rotation transmission section 12, centrifugal force is applied to the items to be washed in the dehydration tank 4, and the items to be washed are dehydrated by this action.

In the present invention, in the dehydration step, the rotation speed of the dehydration tank 4 is set to 300 by the operation section 23.
The rotations per minute is input to the control device 20, while the AC clock circuit 22 provides an input that is in phase with the power frequency applied to the motor 8 to the transformer 22a. This input is stepped down by a transformer 22a, half-wave clamped by a diode 22c, a resistor 22b limits the current flowing into a transistor 22d, and a transistor 22d and a resistor 22e shape it into a sine half-wave rectangular wave suitable for the input of the control device 20. be done. This shaped rectangular wave is input to the control device 20.

The control device 20 receives both inputs and outputs them to the frequency converter 21, where only the shaded portion of the power supply frequency is applied to the motor 8 as shown in the waveform diagram of FIG. The frequency of the shaded part is 1/3 of the fundamental frequency 50/60Hz, and as a result, the rotation speed of the motor 8, which is an induction motor, is also 1/3, and the rotation speed of the dehydration tank 4 is 1/3. The rotation speed is also 1/3 of the normal high speed rotation. In this way, the items to be washed in the dehydration tank 4 are dehydrated by low speed rotation.

In the above embodiment, the rotation speed of the dehydration tank 4 is 1/3 of the normal high speed rotation, but the rotation speed is not limited to this, It goes without saying that this can be carried out as long as the rotational speed is less than or equal to the rotational speed. Furthermore, as a result of experiments, it has been found that a rotation speed of about 1/3 to 1/2 (300 to 450 revolutions/minute) is desirable for delicate fibers such as wool.

Furthermore, if a rotation speed detection means 14 for detecting the rotation speed of the motor 8 is added to the embodiment described above, there is an effect that the torque at the time of starting the motor 8 can be effectively utilized.

Although the above embodiments were explained using a fully automatic stirring type washing machine as an example, the method of the present invention can be applied to all types of washing machines having a dehydrating tank, such as a two-tub type or a pulsator type (vortex type). It can be applied to

〔Effect of the invention〕

As described above, in the dehydration operation method of the washing machine of the present invention, in addition to the normal high speed rotation, during the entire dehydration period excluding the startup, the
Since low speed rotation of about 1/2 rotation speed is also possible,
The rotation speed depends on the material of the item to be washed, and therefore centrifugal force can be obtained depending on the material of the item to be washed.For example, it is possible to obtain a centrifugal force depending on the material of the item to be washed.For example, it is possible to obtain a centrifugal force depending on the material of the item to be washed. However, the cloth can be dehydrated well without causing damage, deformation or wrinkles.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the operation control mechanism used in the dehydration operation method of a washing machine according to the present invention, Fig. 2 is a waveform diagram of waves converted by a frequency converter, and Fig. 3 is a vertical cross-sectional side view of a single-tank agitation washing machine. It is a diagram. 1... Agitator, 2... Through hole, 3... Stirring blade, 4... Dehydration tank, 5... Through hole, 6... Balancer, 7... Water receiving tank, 8... Motor, 9... Pulley, 10... V-belt, 11... Pulley,
12...Rotation transmission unit, 12a, 12b...Drive shaft, 13...Spring clutch mechanism, 14...Rotation speed detection means, 20...Control device, 21...Frequency converter, 22...AC clock circuit, 22a ...Transformer, 22b...Resistor, 22c...Diode, 22d...Transistor, 22e...Resistor,
23...Operation unit.

Claims (1)

[Claims] 1. A frequency conversion means is connected to the dehydration tank motor for selectively rotating the dehydration tank motor at either high speed or low speed from the start of dehydration to the end of dehydration, and A dehydrating washing machine characterized by dehydrating operation from the start of dehydration to the end of dehydration at either high speed rotation or low speed rotation with a rotation speed of about 1/3 to 1/2 of the rotation speed at the high speed rotation, depending on the output. how to drive.