Abstract: A duct (12) movable axially within a tubular wall (1) is provided so as to form with the latter a cavity (I) with grill (14) and an expansion piece (7) shaped so as to cooperate with the upper edge of the duct (12) when the latter is raised so as to close it off and when the latter is lowered so as to form an annular space. A body (18) with holes (20) for entry of the air into the cavity (I) is provided at the end of the tubular wall (1). The duct (12) is movable through a central hole (18A) of the body (18) and has a collar (24) which closes off the holes (20) when the duct (12) is raised, and has holes (26) which, when the duct (12) is raised, are located above the body (18) and, when the duct (12Is lowered, are closed off by the wall of the hole (18A). The suction current is created in the duct (12) during the two phases of tensioning and reversing.

Abstract: A device for pneumatically tensioning and reversing tubular manufactured articles such as socks, upon completion, by a circular knitting machine. The device includes a small diameter rotating needle cylinder. The device has an external tubular casing and an internal element for forming an interspace with an annular cross section for pneumatic tensioning. The internal element forms an axial passage inside which the manufactured article is turned inward and reversed during a pneumatic operation where the article is reversed and conveyed away. Both the tubular casing and the internal element consist of two sections with different diameters. Upper sections with a smaller diameter are accommodated within the needle cylinder and the lower sections with a larger diameter are located outside and adjacent to the needle cylinder.