(57) A thread brake (1) is described which is particularly suitable for regulating the
tension of sewing thread (5) during winding, In a preferred arrangement, the thread
brake comprises two coaxial brake discs (2, 3) rotatably mounted on a wear-resistant
sleeve (8) which is supported on a pin (8a) passing axially through the body of an
electromagnet (4). The outermost disc (3) is made of ferromagnetic material and, when
the electromagnet (4) is energised, it is urged towards the other disc (2) so as to
apply a braking pressure to the thread (5). A series of countersunk and radial apertures
(7) are provided in the outermost disc (3) and are disposed in a circle concentric
to axis of rotation. This disc (3) also has a slight concave depression (13) on its
braking side directly opposite the other disc (2). Both discs have central apertures
and the central aperture (16) of the outermost disc (3) is also countersunk. Both
discs can tilt through a predetermined angle on the sleeve (8). The apertures (7,
16) provide an exit for material abraded from the thread due to passage between the
braking discs (2, 3).
|
|
