US Patent 11077546 Robot

A robot includes a main body provided with a traveling unit, a body display unit disposed on an upper portion of a front side of the main body and elongated in a vertical direction, a head display unit rotatably connected to an upper portion of the body display unit, a rotary motor disposed inside the body display unit, a rotational shaft elongated in a vertical direction and rotated by the rotary motor to rotate the head display unit, and a speaker disposed inside the body display unit, spaced apart from the rotary motor, and overlapping the rotational shaft in a horizontal direction. The robot selectively receives various types of service modules to provide different services.