Laundry treatment device

Patent metadata

Field	Value
Publication number	US-2021102327-A1
Application number	US-201816608005-A
Country	US
Kind code	A1
Filing date	Apr 24, 2018
Priority date	Apr 24, 2017
Publication date	Apr 8, 2021
Grant date	—

Abstract

The present invention relates to a laundry treating apparatus. The laundry treating apparatus according to an embodiment of the present invention includes a control unit which controls the tub to rotate at a first speed in a case of a blanket dehydration mode, to rotate at a second speed lower than the first speed so that the plurality of balls are dispersed when amount of eccentricity in the first speed rotation is equal to or greater than a first reference value, and to rotate at a third speed higher than the first speed when the amount of eccentricity in the first speed rotation is less than the first reference value. Accordingly, in a blanket dehydration mode, it is possible to stably perform dehydration by preventing the plurality of balls from operating unbalanced.

First claim

1 . A laundry treating apparatus comprising:
a casing; a tub inside the casing; a ball balancer which is disposed in at least one side of the tub, and has a plurality of balls and a guide part for guiding movement of the plurality of balls; a door which is attached to the casing and is opened and closed; a motor for rotating the tub; a driving unit for driving the motor; and a control unit which controls the tub to rotate at a first speed in a case of a blanket dehydration mode, to rotate at a second speed lower than the first speed so that the plurality of balls are dispersed when amount of eccentricity in the first speed rotation is equal to or greater than a first reference value, and to rotate at a third speed higher than the first speed when the amount of eccentricity in the second speed rotation is less than or equal to a second reference value.

2 . The laundry treating apparatus of claim 1 , wherein the control unit controls the plurality of balls to rotate at the third speed of the tub, in a state in which the plurality of balls are dispersed.

3 . The laundry treating apparatus of claim 1 , wherein the control unit increases the speed of the tub to pass through a transient resonance section, in a state in which the plurality of balls are dispersed.

4 . The laundry treating apparatus of claim 1 , further comprising a vibration detection unit for detecting vibration of the tub,
wherein the control unit controls the tub to stop, when vibration amount of the tub detected by the vibration detection unit is greater than or equal to a third reference value, during the third speed rotation, and to rotate at a fourth speed higher than the third speed, when the vibration amount of the tub detected by the vibration detection unit is less than the third reference value.

5 . The laundry treating apparatus of claim 1 , wherein the control unit calculates cloth amount in the tub in a case of the blanket dehydration mode, controls the tub to rotate at a second speed lower than the first speed so that the plurality of balls are dispersed, when the cloth amount is less than or equal to a certain value and the amount of eccentricity in the first speed rotation is greater than or equal to the first reference value, and to rotate at a third speed higher than the first speed when the amount of eccentricity in the second speed rotation is less than or equal to the second reference value.

6 . The laundry treating apparatus of claim 5 , wherein the control unit calculates the amount of eccentricity in the first speed rotation, and calculates the cloth amount before the calculation of the amount of eccentricity.

7 . The laundry treating apparatus of claim 6 , wherein the control unit rotates the tub at the first speed, before the calculation of the amount of eccentricity, and calculates the cloth amount, during the first speed rotation.

8 . The laundry treating apparatus of claim 1 , wherein the control unit rotates the tub at the first speed so that the cloth is attached to the tub.

9 . The laundry treating apparatus of claim 1 , wherein the control unit controls the tub to rotate at the first speed in a case of the blanket dehydration mode, and to rotate at a third speed higher than the first speed, when the amount of eccentricity in the first speed rotation is less than the first reference value.

10 . The laundry treating apparatus of claim 1 , wherein the control unit controls the tub to rotate at the first speed in a case of a normal dehydration mode, and to rotate at a third speed higher than the first speed, when the amount of eccentricity in the first speed rotation is equal to or less than an allowable value.

11 . A laundry treating apparatus comprising:
a casing; a tub inside the casing; a ball balancer which is disposed in at least one side of the tub, and has a plurality of balls and a guide part for guiding movement of the plurality of balls; a door which is attached to the casing and is opened and closed; a motor for rotating the tub; a driving unit for driving the motor; and a control unit which controls the tub to rotate at a first speed in a case of a blanket dehydration mode, to rotate at a second speed lower than the first speed so that the plurality of balls are dispersed when amount of eccentricity in the first speed rotation is equal to or greater than a first reference value, and to rotate at a third speed higher than the first speed when the amount of eccentricity in the first speed rotation is less than the first reference value.

12 . The laundry treating apparatus of claim 11 , further comprising a vibration detection unit for detecting vibration of the tub,
wherein the control unit controls to rotate at the third speed higher than the first speed when the amount of eccentricity in the second speed rotation is equal to or less than a second reference value, and controls to rotate at a fourth speed higher than the third speed when vibration amount of the tub detected by the vibration detection unit is less than a third reference value.

13 . The laundry treating apparatus of claim 12 , wherein the control unit controls the plurality of balls to rotate at the third speed of the tub, in a state in which the plurality of balls are dispersed.

14 . The laundry treating apparatus of claim 12 , wherein the control unit increases the speed of the tub to pass through a transient resonance section, in a state in which the plurality of balls are dispersed.

Assignees

• Lg Electronics Inc

Inventors

• Choi Moonsuk

Classifications

• F16F2234/08

  spherical · CPC title

• F16F2232/02

  Rotary · CPC title

• F16F2222/08

  Inertia · CPC title

• F16F15/002

  characterised by the control method or circuitry (control of mechanical oscillations per se G05D19/00) · CPC title

• F16F15/363

  using rolling bodies, e.g. balls free to move in a circumferential direction · CPC title