The bearing sits on an axle rotatably arranged in a housing. The cord roller (11) has a projection (18) in the direction of the axle (12) that is inserted in a fissure (19). The housing may have an upper section (13) and a housing lower section (14), with the axle connected to the housing section, with a passage (20) in the mounted layer of the lower housing section. The cord roller may be made from polyamide whilst the housing (13, 14) may be made from a plastic.
