Drum type washing machine

Abstract

A drum type washing machine is provided with a closed-end cylindrical drum (3) which is supported in a rotatable manner by a horizontal or tilted rotating shaft (31), a water tank (2) which receives the drum (3), a drive motor (4) which drives the drum (3), an annular container (17) which is provided integrally with the drum (3), and rolling bodies (8) which are received in a movable manner within the annular container (17). The drum type washing machine is further provided with: an imbalance detection unit which, while the drum (3) is rotated, detects the state of imbalance of the drum (3) created by the imbalance of laundry within the drum (3) and by the rolling bodies (8); and a control unit which analyzes the position of imbalance detected by the imbalance detection unit and which controls the drive motor (4). The control unit detects the state of imbalance of the drum (3) by means of the imbalance detection unit while rotating the drum (3) at a rotational speed at which the laundry within the drum (3) does not fall and at which the rolling bodies (8) stay at the lower part of the drum (3).

Description

technical field [0001] The present invention relates to a drum-type washing machine including a rotatable drum that accommodates laundry in an elastically supported water tank, and washing, rinsing, and dehydration of the laundry are performed in the drum. Background technique [0002] Generally, in the dehydration process of a drum-type washing machine having a horizontal or inclined rotating shaft, the laundry is often in an uneven state, that is, an unbalanced state in the drum. As a result, an unbalanced force is applied to the rotating shaft during dehydration, and vibration occurs. The amplitude of the vibration increases in proportion to the square of the rotational speed of the rotating drum. Problems arise such as that the washing machine itself moves due to the vibration, and that the operation cannot be performed at a certain number of revolutions or more due to strong noise. [0003] In order to reduce vibration caused by unbalanced laundry, there is a ball bal...

AI Technical Summary

Problems solved by technology

The following problems arise: the washing machine itself moves due to the vibration, and the operation cannot be performed above a certain rotation speed due to the strong noise.

[0008] However, in the conventional structure, when the rotational speed of the drum 101 is lower than the resonance rotational speed, the unbalance between the rolling elements 103 and the laundry exists in the same phase position.

Therefore, there is a problem that the rolling element 103 acts as an imbalance with the laundry, so that the vibration may increase when passing the resonance rotation speed.

[0009] In addition, when detecting the eccentric amount and eccentric position of the laundry in the drum 101, the rolling element 103 also rotates simultaneously with the drum 101, so it is difficult to detect the eccentric state of the laundry with high accuracy.

In addition, there is a problem that the rolling element 103 used to eliminate the imbalance becomes the cause of the imbalance due to an eccentric state such as a small amount of eccentricity of the laundry.

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