Tension control device for tubular products like socks or similar items made on circular knitting machines

A tubular sleeve with an upper section (809) with a smaller diameter is held inside a cylinder of needles (803) while the lower section (810) with a larger diameter is put under the cylinder of needles and holds a mobile unit in respect to the sleeve (809) with a moveable internal conduit (812): defined by the bottom section (810), a round cavity (814) outlined by a diaphragm with holes (832); a primary suction conduit (816) is joined to the lower section of said round cavity and a grill (830) holds the product on top of the suction conduit (816). A spear valve (834) is held axial to the mobile equipment used to control the holes (832). A stem (842) is suspended in such a way that it is attached to the structure (805) of the needle or crochet needle (801), and at the very bottom (846) is a means to rotate (846) a moulded expansion (848), this is used to work with the upper edges of the mobile internal conduit (812) of the mobile equipment to seal the conduit when raised and to form a ringed passage (D) towards the interior of the mobile conduit (812) when it is lowered, so as to topple and move the product away. (Figure 2)