Patent ID: 7668631

Claim:
Apparatus for cutting grass in a cut area delimited by a perimeter, said perimeter being defined by the presence of regions of grass surface having height lower or greater than a preset value, said apparatus comprising a lawn-mower and a lawn-mower-recovery base, said lawn-mower comprising: a motor unit for the directional displacement of said lawn-mower, a cutting device, said lawn-mower-recovery base being disposed along said perimeter of the cut area with an accessible aperture allowing the entry of the lawn-mower moving along said perimeter, said lawn mower further comprising at least a first proximity sensor able to detect the presence, if any, of a grass surface exceeding said height; a control unit operatively associated with said first proximity sensor for receiving a signal therefrom, said control unit being configured to detect said perimeter according to said signal, said control unit being configured to determine a condition of alignment of said lawn-mower with said perimeter according to said signal, said control unit being operatively connected to said motor unit to cause a displacement of the lawn-mower along said perimeter in response to the alignment condition to operate the return of said lawn-mower into the lawn-mower-recovery base.