Filter cleaning in a vacuum cleaner

Filter cleaning in a vacuum cleaner, with the cleaning of the filter (1; 2) or parts of the filter (1; 2) by supplying a secondary air stream (16) takes place, and wherein a control of the secondary air stream (16) through the filter (1; 2) is carried out for cleaning in such a way that by exploiting pressure differences in a housing (3) arranged flap member (13) abruptly changes its position and openings (4a; 5a; 6a; 7a) opens in the housing (3) and / or closes, so passes, characterized in that the flap element (13) is designed as a rotary vane with a plurality of fixed together for rotation part wings is not driven directly but operates passively and a; that the secondary air stream (16) in a pulsed manner to the dedusted surface of the filter (1: 2) first, in a second end position only by the pressure difference verschwentzbar, and in that the flap element (13) is alternately reversed, so that alternately one or the di e other filter surface (1; 2) is cleaned, while just not cleaned filter surface ...