Abstract: The invention relates to an apparatus for separating and recovering solid particles transported by a gaseous flow. The apparatus includes a separation chamber (40), an admission conduit (43) by which the gaseous flow laden with particles arrives, an escape conduit (44) by which the flow leaves after having been relieved of its particles, a discharge conduit (47) toward which the particles separated from the gaseous flow are urged, a movable flap (49) making it possible with the discharge conduit to comprise a particle recovery box, and a helical device (52) placed in the discharge conduit to prevent the particles thus recovered from being re-aspirated by the rising flow that escapes via the escape conduit (44). The invention is applicable to magnetographic printing machines.

Abstract: The invention relates to a device for the reintroduction of solid developer particles, which have been separated from a gaseous carrier flow, into a reservoir that is open to the air. The derive (60) is disposed between the reservoir (15) and the apparatus (26) for separation and recovery of particles, and it includes a chute (61) into which the discharge conduit (47) of the apparatus discharges. A transport element (65) that slides inside the chute (61) isolates the discharge conduit from ambient atmospheric pressure. This transport element is provided with a cavity (67) in which the particles that drop into the conduit accumulate, and the accumulated particles are then transported outside the chute and drop into the reservoir (15). The invention is applicable to non-impact printing machines.