Extensible gripping device configured for gripping a tool , wherein said extensible gripping device comprises: - gripping members , - an extensible structure for supporting and moving said gripping members along a gripping direction , - fastening plates configured for fixing said extensible gripping device to a frame , wherein said fastening plates delimit said extensible gripping device from opposite sides and are connected to each other via a transversal element , wherein said extensible structure comprises two lateral plates operatively slidably connected to opposite sides of said transversal element , a first cradle element slidably connected to said lateral plates and a second cradle element slidably connected to said first cradle element , wherein said gripping members are operatively connected to said second cradle element , - a motor unit operatively connected to said lateral plates via a first transmission unit, wherein said first transmission unit is configured to move said lateral plates relative to said fastening plates along said gripping direction , - a second transmission unit configured to kinematically connect said lateral plates with said first cradle element and said first cradle element with said second cradle element via respective connections of pinion-rack type, so that the movement of said lateral plates with respect to said fastening plates causes a simultaneous movement of said first cradle element which, in turn, causes a simultaneous movement of said second cradle element all with the same direction of advancement along said gripping direction , wherein said motor unit is constrained to said transversal element and said first transmission unit comprises a mechanical transmission for connecting the motion output of motor unit to both said lateral plates . - gripping members , - an extensible structure for supporting and moving said gripping members along a gripping direction , - fastening plates configured for fixing said extensible gripping device to a frame , wherein said fastening plates delimit said extensible gripping device from opposite sides and are connected to each other via a transversal element , wherein said extensible structure comprises two lateral plates operatively slidably connected to opposite sides of said transversal element , a first cradle element slidably connected to said lateral plates and a second cradle element slidably connected to said first cradle element , wherein said gripping members are operatively connected to said second cradle element , wherein said fastening plates delimit said extensible gripping device from opposite sides and are connected to each other via a transversal element , wherein said extensible structure comprises two lateral plates operatively slidably connected to opposite sides of said transversal element , a first cradle element slidably connected to said lateral plates and a second cradle element slidably connected to said first cradle element , wherein said gripping members are operatively connected to said second cradle element , - a motor unit operatively connected to said lateral plates via a first transmission unit, wherein said first transmission unit is configured to move said lateral plates relative to said fastening plates along said gripping direction , - a second transmission unit configured to kinematically connect said lateral plates with said first cradle element and said first cradle element with said second cradle element via respective connections of pinion-rack type, so that the movement of said lateral plates with respect to said fastening plates causes a simultaneous movement of said first cradle element which, in turn, causes a simultaneous movement of said second cradle element all with the same direction of advancement along said gripping direction , <EOS>