Automatic cleaning device

An automatic cleaning device comprising:

• a body;
• a suction head located at a location of the body and having at least one main brush and a brush motor to rotate the main brush;
• a suction motor located on the inside of the suction head to suction air;
• an exhaust located behind the suction motor to discharge the air to the outside of the body after dust, suctioned along with the air, is filtered by a filter cartridge;
• an air injector to inject part of the air, moving to the exhaust, to the outside of the body;
• and
• an auxiliary cleaner to direct dust to the suction head, wherein the auxiliary cleaner includes:
• at least one side brush having a rotating shaft mounted in a location of the body and a plurality of rotating blades attached to the rotating shaft;
• and
• a brush rotator to rotate the side brush in accordance with driving of the brush motor,
• wherein the side brush has a vertically movable lifting mechanism, and
• wherein the lifting mechanism includes:
• a rotating disk fitted around the rotating shaft to simultaneously rotate with the rotating shaft, the rotating disk having a plurality of slits;
• and
• a plurality of lifters extending upward from upper ends of the rotating blades, respectively, to be inserted through the slits in a vertically slidable manner, a stopper being formed at an upper end of each of the lifters.