JPH08876A - Drum type washing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] In a drum type washing machine, the speed of the rotating drum during dehydration is controlled based on the degree of vibration of the outer tub due to uneven distribution of the laundry in the rotating drum, and the washing time is shortened. And reduce vibration. [Configuration] Amplitude of the outer tub 3 detected by the vibration detection devices 20 and 20 during low-speed rotation for loosening the cloth (processing 34) that is performed at the beginning of washing and rinsing (processing 31 and 32) and dehydration. Is smaller than the specified value (decision 35), the rotary drum 8 is rotated at high speed to quickly end the dehydration process (process 38).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine in which a horizontal drum concentrically provided in an outer tub rotates to wash, rinse and dehydrate the clothes inside.

[0002]

2. Description of the Related Art Conventionally, a rotary drum having a large number of dehydration holes on its peripheral surface is rotatably provided in an outer tub elastically supported in a machine frame by a plurality of suspension springs. The rotating drum whose lower part is immersed in the washing water stored in an appropriate amount of is rotated or repeatedly rotated by a motor to perform washing,
Next, a drum type washing machine is rinsed by the same rotation operation and finally rotated by rotating the rotary drum at a higher speed than during washing to perform dewatering, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-115858. ing.

[0003]

Here, in the drum type washing machine, vibration is transmitted to the machine frame through the outer tub, the suspension spring, etc. with the rotation of the rotary drum during operation, and sometimes the machine frame. There was a problem in that it vibrates greatly in the vertical and horizontal directions, which causes noise.

In particular, this phenomenon largely appears during spin-drying when the rotating drum rotates at a high speed, and the uneven distribution of the laundry in the rotating drum has a great influence. That is, the strength of the degree of eccentricity determined by the distribution of laundry in the rotating drum becomes the magnitude of the amplitude of the outer tub, which greatly affects the magnitude of vibration transmitted to the machine casing and the degree of noise generated.

Therefore, in general, at the beginning of the dehydration process in which washing and rinsing are completed and the following rotary drum rotates at high speed, in order to eliminate unevenness of laundry which causes vibration and noise,
The control method was to temporarily rotate the same low-speed rotation as before that, control the rotating drum so that the process of loosening the cloth could be entered, and then perform high-speed rotation in earnest to perform the dehydration process.

However, in the control mode in which the low speed rotation of the rotary drum for loosening the cloth is performed after such rinsing, the cloth loosening stroke can be entered even if the washing and rinsing are completed without uneven distribution of the cloth. Therefore, there is a problem that the total time required to complete the washing becomes long. Also, even if the cloth unraveling process is performed, the uneven distribution of the cloth is not always completely eliminated, and the rotating drum rotates to change the distribution of the laundry, which may naturally reduce the eccentricity. .

[0007] Therefore, from the viewpoint of reducing the noise during washing as a whole, it cannot be said that it is absolutely advisable to include the cloth unraveling process, and it is preferable that the cloth unraveling is carried in when necessary.

Therefore, in the present invention, an amplitude detection device for detecting the amplitude of the vibrating outer tank is provided, and when the outer tank vibration is below a specified value at which the amplitude detection device does not operate, the cloth loosening process is omitted and rotation is performed from the beginning. An object of the present invention is to provide a drum-type washing machine capable of controlling a rotation so as to execute a dehydration process in which a drum is rotated at a high speed, and shortening a washing time and reducing vibration during dehydration.

[0009]

DISCLOSURE OF THE INVENTION The present invention is directed to a horizontal outer tank elastically supported in a machine frame, and a rotatably mounted outer tank having a large number of dehydration holes on its peripheral surface. In a drum type washing machine including a formed rotating drum and a water supply / drainage device for the rotating drum, a series of washing operations such as washing, rinsing, and dehydrating are performed in the rotating drum, in the vicinity of the outer tub. An amplitude detecting device arranged to detect the amplitude of the outer tub and a vibration detected by the amplitude detecting device during a low speed rotation of the rotary drum performed for the cloth loosening process at the beginning of the dehydration process are predetermined. And a control means for controlling the rotary drum to shift to the high speed rotation while omitting the low speed rotation.

[0010]

Operation: After washing and rinsing, the dehydration process is started, and the rotating drum operates at low speed for loosening the cloth. At this time, the amplitude detector detects whether the vibration of the outer tank is larger or smaller than the specified value. For this reason, if it is less than the specified value, it is determined that the degree of eccentricity is small, and the rotating drum is immediately rotated at a high speed for dehydration, so that the washing time is shortened.

[0011]

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

Reference numeral 1 is a machine frame of a drum type washing machine 2, 3 is an outer tub having a cylindrical shape, and a plurality of suspension springs 5 having lower ends fixed to a supporting frame 4 provided on the upper part thereof are installed in the machine frame 1. The lower part is supported by vibration damping devices 6 and 6 while being laid horizontally. Reference numeral 7 indicates a support member for the suspension spring 5. Reference numeral 8 is a rotary drum which is also rotatably provided in the outer tub 3 in the lateral direction. A large number of dehydration holes 9 are formed on the peripheral surface of the rotary drum 7, and the rotary drum 7 is provided on the inner surface thereof. A plurality of baffles 10, which are projections for lifting and knocking down the loaded laundry, are provided at equal intervals. The rotating drum 8 is supported by a rotating shaft at the center of the end wall on the front side opposite to the clothes insertion port. Reference numeral 11 is a drive motor for rotating the rotary drum 8, and rotational power is generated via a belt 13 laid between a small pulley 12 attached to the motor shaft of the rotary drum 8 and a large pulley provided on the rotary shaft of the rotary drum 8. Is transmitted.

A water supply device 14 is provided on the upper portion of the machine casing 1 for supplying water into the outer tub 3 during washing and rinsing.
When the valve 15 is opened, water is supplied through the water supply hoses 16a and 16b. A drainage device 17 is provided in the lower portion of the outer tub 3, and water in the outer tub 3 is drained to the outside by a drain hose 18 after washing, rinsing, and dehydration. Again 1
Reference numerals 9 and 19 are legs.

When the drum type washing machine 2 is operated and the rotary drum 8 rotates, the outer tub 3 in which the drum 8 is inserted vibrates. Amplitude detection devices 20 and 20 that detect the vibration of the outer tub 3 and detect that the amplitude vibrates beyond a specified value are arranged in the vicinity of the outer tub 3 so as to face each other. A micro switch or the like can be used for the amplitude detection devices 20 and 20, and the detection pieces 21 and 21 thereof, for example, when the outer tank 3 vibrates at an amplitude of 5 mm or more that is a specified value,
They are separated by a dimensional distance such that they come into contact with the operating protrusions 22, 22 provided on the outer tub 3 side. Therefore, when the distance is 5 mm or less, the detection pieces 21 and 21 do not contact the outer tub 3, and the amplitude detection devices 20 and 20 are inoperative.

In the drum type washing machine 2 having the above-described structure, water is supplied to the outer tub 3 by the water supply device 14 to a suitable height position during the washing. Further, by putting an appropriate amount of detergent, the laundry put in the rotary drum 8 is immersed in the washing water.

After that, the rotating drum 8 is rotated at a low speed by the drive motor 11 controlled at a low speed, and the laundry is repeatedly dropped while being lifted upward by the baffle 10 to wash.

After the washing process is completed and the water is drained, the rotary drum 8 is similarly rotated at a low speed to perform rinsing while supplying water.

When the rinsing is completed, the drive motor 11 is controlled at a high speed to rotate the rotary drum 8 at a high speed for dehydration. In the present invention, the amplitude detecting device 2 is used during the dehydration process.
A control device for controlling the rotation of the rotary drum 8 is provided in association with 0 and 20.

The control device and its operation are shown in FIG.
The control flow will also be described.

When the control flow starts, the washing process (process 31) and the rinsing process (process 32) proceed, and when the dehydration process starts and dehydration starts (process 33), the rotary drum 8 is started at the beginning of the dehydration process. The drive motor 11 is controlled to rotate at low speed (process 34). This is for loosening the cloth so that the uneven distribution of the laundry in the rotary drum 8 is reduced as described above.

When the rotary drum 8 for loosening the cloth is rotated at a low speed, the vibration of the outer tub 3 is detected by the amplitude detecting devices 20, 2.
It is detected at 0 and it is determined whether the amplitude is equal to or larger than a specified value (for example, 5 mm) (decision 35).

Amplitude 5 at which the amplitude detectors 20, 20 operate
When the value is equal to or more than mm (NO in determination 35), the cloth unraveling process is performed in which the rotary drum 8 is rotated at a low speed for a short time or several times to unravel the cloth (process 36). Then, this cloth unraveling process is performed a prescribed number of times, for example, three times as a limit, and each time the cloth unraveling is completed once, the degree of amplitude is detected again in the judgment 35, and if the amplitude is large, the cloth unraveling is carried out again. It is performed (decision 37).

On the other hand, when the amplitude detection devices 20 and 20 do not operate from the beginning and the amplitude is 5 mm or less at the start of dehydration when the rotary drum 8 rotates at a low speed (YE of judgment 35).
S), the speed of the drive motor 11 is controlled to rotate the rotary drum 8 from the beginning at a high speed during dehydration (process 38). Then, the rotary drum 8 is rotated at a high speed for a predetermined set time to end the dehydration, and the drive motor 11 is stopped.

In this way, when it is determined that the degree of eccentricity of the rotary drum 8 is small from the beginning during low-speed rotation at the start of spin-drying, the cloth loosening step is omitted and the full-scale spin-drying step is performed. Therefore, the entire washing time including the dehydration time is shortened.

Further, even when the amplitude becomes 5 mm or less before the cloth is loosened a predetermined number of times, the rotary drum 8 shifts to the dehydration step (process 38) in which it rotates at a high speed, and the cloth is loosened a predetermined number of times. If you do (YE of judgment 37
S) Forcibly shifts to the normal dehydration process (process 38).

Even when washing and rinsing, the outer tub 3 vibrates and the amplitude detectors 20 and 20 operate, but the detection output at that time is prohibited from being input to the control device for controlling the rotary drum 8.
The drive motor 11 is not involved in the control.

[0027]

As described above, according to the present invention, the amplitude detector is provided in the outer tub portion of the drum type washing machine to detect the outside when the drum is rotated at a low speed for loosening the cloth in the initial stage of dehydration. When the amplitude of the tub is small, the speed is changed to high speed so that the cloth loosening process can be omitted. Therefore, the washing time can be shortened and the washing can be performed efficiently.

Further, when there is no eccentricity of the rotating drum, by rotating at such a high speed to shorten the washing time, it is possible to totally reduce the vibration generated during the dehydration process.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a drum type washing machine according to the present invention.

FIG. 2 is a control flow chart of the present invention in which drive control for the rotating drum is changed according to the amplitude degree of the outer tub.

[Explanation of Codes] 3 Outer Tank 5 Suspension Spring 8 Rotating Drum 11 Drive Motor 20, 20 Amplitude Detector

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koichi Tanaka 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kenji Nakagawa 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A laterally-placed outer tank elastically supported in a machine frame, a rotary drum rotatably provided in the outer tank and having a large number of dehydration holes formed on its peripheral surface, A drum-type washing machine comprising a rotary drum water supply / drainage device, in which a series of washing operations such as washing, rinsing, and dewatering are performed in the rotary drum, the amplitude of the outer tub being arranged in the vicinity of the outer tub. When the vibration detected by the amplitude detection device is smaller than a predetermined specified value during the low speed rotation of the rotary drum performed for the cloth loosening process at the beginning of the dehydration process, A drum-type washing machine, comprising: a control unit that controls the rotating drum so as to shift to the high-speed rotation while omitting the low-speed rotation.