Patent ID: 7930797

Claim:
A suction brush assembly, comprising: a suction brush body connected to a cleaner body at a rear side thereof and provided with a rotation brush for striking a surface to be cleaned to separate dirt from the surface to be cleaned at a bottom surface thereof; and an up/down adjusting unit for monitoring continuously a state of the surface to be cleaned and adjusting a height of the rotation brush body to vary a distance between the surface to be cleaned and the rotation brush according to the state of the surface to be cleaned so as to prevent the surface to be cleaned from being damaged by the rotating rotation brush, wherein the up/down adjusting unit comprises: a current detecting sensor for detecting a variation in current generated in a first motor for driving the rotation brush by a friction resistance generated between the rotation brush and the surface to be cleaned; an up/down driving part for moving up/down a front side of the suction brush so as to maintain a contacting distance between the rotation brush and the surface to be cleaned; and a control part for comparing a current variation signal detected by the current detecting sensor with a preset current range and driving the up/down driving part according to the compared value.