Patent ID: 8342110

Claim:
Rotary hook ( 1 ) for a lockstitch sewing machine, comprising at least a hook body ( 2 ), in turn comprising a cylindrical cavity ( 11 ) and a basket (or bobbin case holder) ( 6 ), which is free to rotate inside the cylindrical cavity ( 11 ) of the hook body ( 2 ) to which it is constrained by a rib ( 14 ), provided on the outer surface of the basket ( 6 ), which engages with play in a C-shaped race ( 10 ), provided in the inner wall of the cylindrical cavity ( 11 ) of the hook body ( 2 ) and delimited by two plane surfaces parallel to each other and by a cylindrical surface perpendicular to said plane surfaces, to prevent the axial and radial translation of the basket ( 6 ) in the cylindrical cavity ( 11 ), the hook body ( 2 ) being connected to a shaft ( 9 ) from which it receives motion, said rotary hook ( 1 ) being characterized by comprising means ( 23 ; 25 ; 27 ; 29 ; 32 ; 35 ; 36 ; 37 ; 39 ; 31 ; 16 ; 21 ; 121 ; 221 ; 20 ; 200 ) applying an axial pressure on the basket ( 6 ) to cause the rib ( 14 ) of the basket ( 6 ) to lean against one of said two plane surfaces delimiting the C-shaped race ( 10 ) of the hook body ( 2 ) to reduce the noise of the rotary hook ( 1 ) caused by the vibration of the basket due to said play.