# US 2023/0407548 A1 · Laundry drying machine

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- Number: US 2023/0407548 A1
- Document ID: US20230407548A1
- Status: Published application
- Kind: A1
- Application number: 18/240,074
- Filed: 2023-08-30
- Published: 2023-12-21
- Earliest claimed: 2020-09-10
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jihoon KIM; Junghoon LEE; Chanwoo MOON; Youngmin KIM
- Web page: https://patentgrep.com/patent/US20230407548A1

## CPC

- D06F 58/08: Driving arrangements
- D06F 58/06: Mountings for the rotating drums
- D06F 58/26: Heating arrangements, e.g. gas heating equipment (D06F58/18 takes precedence)
- D06F 58/02: having dryer drums rotating about a horizontal axis
- D06F 2105/28: Electric heating
- D06F: LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES

## Abstract

A laundry drying machine includes: a cabinet, a drum disposed inside the cabinet and configured to accommodate a target object, a driving unit configured to rotate the drum, and an electric field generator spaced apart from the drum and configured to generate an electric field inside the drum. The drum includes: a drum body having a cylindrical shape and accommodating the target object, a ground electrode that is in contact with an outer circumferential surface of the drum body, and a support roller that is in contact with the outer circumferential surface and that is configured to, based on the drum body rotating, support the drum body in a direction of the ground electrode, and a shortest distance between a central axis of the support roller and the ground electrode is less than a sum of a diameter of the drum body and a radius of the support roller.

## Claims

### Claim 1

A laundry drying machine comprising:
a cabinet;
a drum that is rotatably disposed inside the cabinet and that is configured to accommodate a target object;
a driving unit that is configured to rotate the drum; and
an electric field generator that is spaced apart from the drum and that is configured to, based on power being applied to the electric field generator, generate an electric field inside the drum,
wherein the drum includes:
a drum body that has a cylindrical shape and that is configured to accommodate the target object therein,
a ground electrode that is in contact with an outer circumferential surface of the drum body, and
a support roller that is in contact with the outer circumferential surface of the drum body and that is configured to, based on the drum body rotating, support the drum body in a direction of the ground electrode, and
wherein the ground electrode includes a ground roller that has a first side connected to a side panel of the cabinet and that is in contact with the outer circumferential surface of the drum body,
wherein the ground roller includes:
a roller body,
a roller support fixed to the side panel,
a spring that has a first end fixed to the roller body and a second end fixed to the roller support,
a conductive roller that is in contact with the outer circumferential surface of the drum body, and
a roller hub rotatably disposed on a central axis of the conductive roller,
wherein the ground roller is configured to rotate in response to a vibration of the drum body, and
wherein a contact between the ground roller and the drum body is maintained.

### Claim 2 (depends on 1)

The laundry drying machine according to claim 1, wherein the spring is configured to, based on the roller body moving at a certain angle by an irregular vibration of the drum body, be tensioned.

### Claim 3 (depends on 1)

The laundry drying machine according to claim 1, wherein the ground roller includes at least two or more ground rollers along an axial direction of the drum body.