Self-propelled working robot having horizontally movable work assembly retracting in different speed based on contact sensor input on the assembly

A self-propelled working robot comprising:

• a traveling assembly having a wheel rotating on a floor surface;
• a working assembly for doing work on the floor surface, wherein the working assembly is attached to the traveling assembly so that the working assembly is movable in a left-right direction with respect to the traveling assembly;
• a moving mechanism for moving the working assembly with respect to the traveling assembly so as to change a positional relationship between the traveling assembly and the working assembly;
• a first contact sensor provided in the working assembly for detecting a contact of the obstacle with a front surface of the working assembly;
• a second contact sensor provided in the working assembly for detecting a contact of the obstacle with a side surface of the working assembly;
• and
• means for controlling a travel of the traveling assembly, for controlling the moving mechanism to move the working assembly left and right at a first retraction speed based on a detection signal from the first contact sensor, and for controlling the moving mechanism to move the working assembly left and right at a second retraction speed, being lower than the first retraction speed, based on a detection signal from the second contact sensor.