Laundry drying machine

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.