A roller cover for a floor cleaning machine having a housing, wherein the housing has a housing wall which delimits a housing interior, which comprises a rear wall and two opposite side walls (25, 27) and which has an opening which is arranged to point towards a floor surface to be cleaned during operation of the roller cover, having a cleaning roller, which extends along a longitudinal axis and has at least one cleaning element radially on the outside, wherein the cleaning roller extends along its longitudinal axis from the first side wall to the second side wall through the housing interior, wherein the at least one cleaning element of the cleaning roller extends through the opening, having a drive which is coupled to the cleaning roller in order to drive it in rotation, wherein the drive is designed such that when the cleaning roller is driven, the part of the cleaning roller which is intended to engage with a floor surface to be cleaned rotates towards the rear wall, wherein a dirt container is arranged in the housing interior on the side of the cleaning roller facing away from the rear wall, wherein a dirt strip arrangement (63, 65, 73) is attached to the housing wall, which has a lower edge which runs parallel to the longitudinal axis and is designed to rest on a floor surface to be cleaned, wherein the dirt strip arrangement (63, 65, 73) is mounted on the housing wall such that the lower edge is arranged on the side of the longitudinal axis of the cleaning roller facing the rear wall, characterized in that the dirt strip arrangement (63, 65, 73) is movably mounted on the housing wall such that the distance between the lower edge and the longitudinal axis, seen perpendicular to the longitudinal axis and perpendicular to the plane of the opening, can be varied. wherein the housing has a housing wall which delimits a housing interior, which comprises a rear wall and two opposite side walls (25, 27) and which has an opening which is arranged to point towards a floor surface to be cleaned during operation of the roller cover, having a cleaning roller, which extends along a longitudinal axis and has at least one cleaning element radially on the outside, wherein the cleaning roller extends along its longitudinal axis from the first side wall to the second side wall through the housing interior, wherein the at least one cleaning element of the cleaning roller extends through the opening, having a drive which is coupled to the cleaning roller in order to drive it in rotation, wherein the drive is designed such that when the cleaning roller is driven, the part of the cleaning roller which is intended to engage with a floor surface to be cleaned rotates towards the rear wall, wherein a dirt container is arranged in the housing interior on the side of the cleaning roller facing away from the rear wall, wherein a dirt strip arrangement (63, 65, 73) is attached to the housing wall, which has a lower edge which runs parallel to the longitudinal axis and is designed to rest on a floor surface to be cleaned, wherein the dirt strip arrangement (63, 65, 73) is mounted on the housing wall such that the lower edge is arranged on the side of the longitudinal axis of the cleaning roller facing the rear wall, characterized in that the dirt strip arrangement (63, 65, 73) is movably mounted on the housing wall such that the distance between the lower edge and the longitudinal axis, seen perpendicular to the longitudinal axis and perpendicular to the plane of the opening, can be varied.