JPS6250158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stirring blade control method for a washing machine such as a fully automatic washing machine, and provides a cleaning method with high cleaning performance, less damage to clothes, and less vibration during spin-drying. It is something to do.

Conventionally, many fully automatic washing machines have been of the pulsator type or stirring type. However, in the former case, although the cleaning performance is very good, there is a large amount of entanglement between the clothes, and as a result, it is difficult to wash the clothes that are located in the center of the entangled clothes. Furthermore, during dehydration, the entangled cloth is pulled by centrifugal force, which causes problems such as damage to the clothes and increased vibration of the washing machine as a whole.

On the other hand, in the case of the stirring type, no entanglement of the cloth was observed, the damage to the cloth was small, and the vibration during dehydration was also small, but it had the drawback of low cleaning performance.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment thereof will be described below based on the drawings.

In FIG. 1, 1 is an outer frame, 2 is an outer tank, and 3 is a washing and dewatering tank (hereinafter referred to as an "inner tank"), and the inner tank 3 is fixed to one end of a dehydrating shaft 4. Reference numeral 5 denotes a substantially conical stirring blade equipped with a plurality of stirring blades 6 for stirring the clothes in the inner tub 3, and the stirring blade 5 is fixed to one end of the washing shaft 7 by an appropriate method. The washing shaft 7 and the dewatering shaft 4 are coaxially arranged. Reference numeral 8 denotes a clutch mechanism incorporating bearings for supporting the washing shaft 7 and the dewatering shaft 4, and a clutch for switching between washing and dewatering. is the rotor 10 that constitutes the linear motor 9
It is connected to a rotating shaft 11 fixed to. 12
is a stator constituting the linear motor 9; when a current is passed through the windings of the stator 12, an eddy current is generated in the rotor 10, causing the rotor 10 to rotate.

13 is a fixture for fixing the linear motor 9, and 14 is a vibration isolation mechanism, one end of which is suspended from the outer frame 1, and the other end of which suspends and holds the outer tank 2.

Next, the operation of the above configuration will be explained.

In FIG. 2, reference numeral 15 indicates a washing/spin-drying switch (hereinafter referred to as a switch) which is switched according to the washing/spin-drying process stored in a washing machine timer (not shown).
16 is a changeover switch (hereinafter referred to as switch S ₂ ) for repeatedly rotating _the linear motor 9.
For example, the switching method for switch S ₂ is CR
Examples include time control methods such as a switching method using a timer and a relay, a switching method using a cam built into a washing machine timer, and an angle detection control method using a phototube or the like.

The switch _S2 is controlled by the control method described above.
It is configured to be able to switch between two ranges: less than one rotation and one or more and two rotations or less.

Now, if switch S ₁ 15 is on side a in Figure 2,
The rotation of the linear motor 9 is transmitted to the washing shaft 7 by a clutch (not shown) in the clutch mechanism 8, resulting in a washing process.

At this time, if the switch S ₂ 16 is on the c side, the rotor 11 rotates clockwise, for example. When the rotor 10 rotates from one rotation to two rotations, that is, within the angular range of 360° to 720°, the switch S ₂ 16 is switched to the d side by the above-mentioned appropriate control method, so that the motor is reversed.

As described above, the stirring blade 5 can perform forward and reverse rotation at a rotation angle of 1 rotation or more and 2 rotations or less.

Next, during the time period just before the end of the washing process, for example, 2 to 3 minutes before the end, the rotation angle of forward and reverse rotation is switched from 1 rotation or more and 2 rotations or less to 1 rotation or less using the appropriate control method described above. , do laundry.

On the other hand, when the switch S ₁ 15 is switched to the side b in the figure, the rotation of the rotor 11 is transmitted to the dewatering shaft 4 by the action of the clutch, and a dewatering process is performed.

In addition, experiments have revealed that if the rotation angle exceeds 720 degrees during the washing process, the clothes will get tangled with the stirring blades, making the operation unsuitable for washing.

In addition, if the inversion angle of the stirring blade 5 is 360° or less, it is preferable for untangling clothes;
In terms of cleaning efficiency, it was found that it was not as effective as the conventional stirring type. Therefore,
During the washing process, it is best to set the reversal angle within the range of 360° to 720°, which causes less damage to clothes and has a high cleaning rate, and should be set to 360° or less near the end of the washing process. It has been found that it is preferable to remove tangles from the clothes and prevent damage to the clothes during dehydration. In addition, the number of strokes of the stirring blade (number of forward and reverse reciprocating rotations per unit time) is 20~
This is the result of an experiment conducted at 30 strokes for 1 minute.

In addition, although the case where a so-called linear motor was used as the motor was shown in the example, this example was implemented by using an induction motor currently used in washing machines and by reversing the rotation direction of the induction motor. It goes without saying that the same stirring movement of the stirring blades as in the example can be performed.

As described above, according to the present invention, the inversion angle of the stirring blade is set to 360° or more and 720° or less, thereby improving both the washing ability and preventing damage to the cloth due to entanglement of clothes. set the inversion angle to
The entanglement of the cloth is removed by setting the angle to 360 degrees or less, and the cloth is evenly distributed in the washing/dehydration tank before dehydration, thereby suppressing the occurrence of vibration during dehydration and preventing damage to the cloth.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a washing machine according to an embodiment of the present invention, and FIG. 2 is an electrical circuit diagram of the same washing machine. 4... Dehydration shaft, 5... Stirring blade, 7... Washing shaft,
8...Clutch mechanism, 9...Linear motor, 10
... rotor, 12 ... stator, 15, 16 ... switch (switching mechanism).

Claims (1)

[Claims] 1 A dehydration shaft to which a washing/dehydration tank is fixed and a washing shaft equipped with a roughly conical stirring blade that performs repetitive rotational motion are installed on the same axis, and the rotation of the motor is controlled via a clutch that switches between washing and dehydration. The information is transmitted to both the shafts, and the inversion angle of the stirring blade is changed during washing.
A stirring blade control method for a washing machine, comprising repeatedly rotating the stirring blade in a range of 360° or more and 720° or less, and switching the inversion angle of the stirring blade to 360° or less in a time period just before the end of washing.