Open-end spinning machines

In an open end spinning machine for the open end spinning of textile fibres, comprising, a spinning element, a rotatable fibre opening roller, means for feeding fibres in the form of a sliver to said opening roller, fibre conveying means for conveying in discrete form to said spinning element fibres opened by said opening roller, said opening roller comprising a boss portion, an end wall portion extending radially outwardly from said boss portion at one end thereof, a cylindrical shell portion extending from said wall portion over and in coaxial relation to said boss portion to form an annular cavity between an outer surface of said boss portion, an inner surface of said wall portion and an inner surface of said shell portion, said shell portion having a plurality of holes therein and a plurality of fibre engaging pins located in the holes, said pins passing from within the annular cavity and having end portions terminating in points protruding from the outer surface of the shell portion, wherein a plastic filler material fills the cavity in the roller and forms a planar end face to the roller.