Patent ID: 7395572

Claim:
A rotating brush controlling apparatus, in a floor sweeping machine, comprising: at least one lifting device ( 15 ) suitable for applying a lifting force ( 15 a ) capable of lifting a rotating brush ( 8 ) to remove the same from a surface to be swept ( 7 ); and at least one actuating device ( 16 ) suitable for applying a working force ( 16 a ) on command, which is opposed to said lifting force ( 15 a ) and exceeding the same; a fluid-dynamic system ( 13 ) suitable for circulating a pressurized fluid, wherein said rotating brush ( 8 ) and said actuating device ( 16 ) are linked to each other, wherein some adjusting devices ( 24 ) are provided, so as to force said rotating brush ( 8 ), with a selective pressure, on said surface to be swept ( 7 ), wherein said actuating device ( 16 ) is a single-effect fluid-dynamic cylinder supplied by said fluid-dynamic system ( 13 ), and wherein said adjusting devices ( 24 ) are suitable for determining a selected working pressure in said fluid-dynamic cylinder ( 16 ), said working force ( 16 a ) depending on said working pressure, and wherein said lifting device ( 15 ) comprises at least one active spring opposed to said fluid-dynamic cylinder ( 16 ) and coaxial with the same.