Patent ID: 7896279

Claim:
Yarn braking device for a yarn feeding device, the yarn braking device comprising an axially stiff, radially deformable braking body with the shape of a frustocone, a large diameter end of the braking body being positioned coaxially over a rounded withdrawal end of a drum-shaped storage body and being pressed resiliently against the withdrawal end from a small diameter end of the braking body by an axial force defining the braking effect between the braking body and the withdrawal end, an axial force generator acting in the axial direction and a centering device acting in the radial direction, respectively, between a stationary holder and the braking body, wherein the axial force generator and the centering device at the same time are formed by at least one pair of permanent magnets, of which one permanent magnet of said pair is supported against the holder while the other permanent magnet of the pair is supported against the braking body, and the permanent magnets of the pair are aligned to each other via an intermediate gap such that the direction of the action of the magnet force between the permanent magnets is inclined obliquely towards the axis of the yarn braking device, and the permanent magnets of the pair generate both axial and radial force components to urge the braking body axially against the withdrawal end of the storage body and to effect centering of the braking body relative to the withdrawal end.