Scraping assembly comprising: i) a guide element (4a-4c) having a main extension axis, or a linear actuator having a main working axis and comprising a stem (4d-4g); wherein said guide element (4a-4c) or said stem (4d-4g) identifies an outer surface; ii) a scraper (10, 12, 14, 16', 16") for cleaning said outer surface, comprising a scraper body (8, 18, 20) which defines: - at least a first aperture suitable for being connected to a compressed air source or to a suction source; - a through chamber (24, 26) for the partial and sliding housing of the guide element (4a-4c) or of the stem (4d-4g) parallel to said main axis (X; Y); and - one or more second apertures (28, 30, 36, 68), supplied through the first aperture and configured to place the through chamber (24, 26) in fluidic communication with the outside environment, so that a flow of air generated by said source shifts or removes deposits, residues, impurities or the like from the outer surface; and iii) a calibrated interstice between the outer surface and a free end of the scraper body (8, 18, 20) closer to said element/stem for the entrance or exit of the air flow; said assembly being characterized in that the second aperture (28, 30) is in the form of a continuous groove or furrow which extends along the scraper body (8, 18, 20), and in that said free end axially defines the through chamber (24, 26) forming an annular lip facing radially inwardly. i) a guide element (4a-4c) having a main extension axis, or a linear actuator having a main working axis and comprising a stem (4d-4g); ii) a scraper (10, 12, 14, 16', 16") for cleaning said outer surface, comprising a scraper body (8, 18, 20) which defines: - at least a first aperture suitable for being connected to a compressed air source or to a suction source; - a through chamber (24, 26) for the partial and sliding housing of the guide element (4a-4c) or of the stem (4d-4g) parallel to said main axis (X; Y); and - one or more second apertures (28, 30, 36, 68), supplied through the first aperture and configured to place the through chamber (24, 26) in fluidic communication with the outside environment, so that a flow of air generated by said source shifts or removes deposits, residues, impurities or the like from the outer surface; and - at least a first aperture suitable for being connected to a compressed air source or to a suction source; - a through chamber (24, 26) for the partial and sliding housing of the guide element (4a-4c) or of the stem (4d-4g) parallel to said main axis (X; Y); and - one or more second apertures (28, 30, 36, 68), supplied through the first aperture and configured to place the through chamber (24, 26) in fluidic communication with the outside environment, so that a flow of air generated by said source shifts or removes deposits, residues, impurities or the like from the outer surface; and iii) a calibrated interstice between the outer surface and a free end of the scraper body (8, 18, 20) closer to said element/stem for the entrance or exit of the air flow; said assembly being characterized in that the second aperture (28, 30) is in the form of a continuous groove or furrow which extends along the scraper body (8, 18, 20), and in that said free end axially defines the through chamber (24, 26) forming an annular lip facing radially inwardly.