Rotary hook with bobbin case for a lockstitch sewing machine including means to reduce the plays between bobbin case and basket and to reduce the noisie thereof

Rotary hook (1) for a lockstitch sewing machine, comprising a hook body (2), in turn comprising a cylindrical cavity (11), a basket (6, 6b), which is free to rotate inside the cylindrical cavity (11) of the hook body (2), a bobbin case (8, 8b) that collaborates with the basket (6, 6b) to constrain a bobbin (4, 4b) on which is wound the bobbin thread (7), the hook body (2) being connected to a shaft from which it receives motion, said rotary hook (1) being characterized by comprising at least one elastic means (30, 40, 50, 60, 61, 70, 130, 140, 150) able to create a friction between bobbin case (8, 8b) and basket (6, 6b), so as to prevent the bobbin case to move and freely vibrate within the plays present between said bobbin case (8, 8b) and said basket (6, 6b) in order to reduce, during sewing, the noise caused by said plays.