Patent ID: 11865485
Assignee: LG ELECTRONICS INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  A | IPC A  B

Claim 6:
7. An air cleaner, comprising:
a case having a left wall, a right wall opposite to the left wall, a bottom, a top provided opposite to the bottom, a front opening, a dispensing slit, and a rear opening provided opposite to the front opening, the right and left walls being perpendicular to the front and rear openings, a left-right direction extending between the right and left walls, and a vertical direction extending between the top and the bottom;
a fan provided inside of the case and configured to suction air through the front opening and discharge air out of the rear opening;
a grill coupled to the case to cover the front opening;
a filter roller provided inside of the case and extending in a left-right direction, the filter roller being configured to rotate and be removable from the inside of the case;
a filter sheet configured to filter foreign matter from suctioned air and wound around the filter roller such that, when the filter sheet is unwound, a first section of the filter sheet extends in the vertical direction between the filter roller and the top of the case so as to cover an intake of the fan and be exposed through the front opening;
a filter cartridge provided inside of the case and having left and right walls that align with the left and right walls of the case, wherein the filter roller is rotatably coupled to the left and right walls of the filter cartridge and is configured to be removed from the filter cartridge;
a frame in which the fan is housed, the frame having left and right walls that align with the left and right walls of the case, respectively, wherein, when the filter sheet is unwound, a portion of the filter sheet moves across a top of the frame; and
a filter cutter and a clamp provided on top of the frame, wherein the frame is provided between the filter cartridge and the rear opening, the clamp is configured to hold down the portion of the filter sheet, and the filter cutter is configured to cut across the portion of the filter sheet in the left-right direction,
wherein the first section has reached a predetermined contamination level, the filter roller is unwound to expose an adjacent section to the first section, and the first section is moved to an outside of the case through the dispensing slit and thereafter separated from the filter sheet,
wherein the filter cutter includes:
a blade having left and right sides, at least one of the left and right sides being configured to cut the filter sheet;
a blade housing coupled to a bottom the blade;
a gear moveable with the blade housing;
a rack extending between the left and right walls of the frame and configured to engage with the gear; and
a motor to rotate the gear, and

wherein, when the motor is operated to turn the gear in a first direction, the blade housing is moved from the left wall of the frame toward the right wall of the frame, and when the motor is operated to turn the gear in a second direction opposite to the first direction, the blade housing s moved from the right wall of the frame toward the left wall of the frame, wherein the filter sheet is cut when the gear is t at least one of the first or second directions.