In a milling machine for working ground surfaces, comprising a milling device mounted at a machine frame transverse to the direction of travel, comprising at least one first conveying device arranged at the machine frame which accepts the milled-off material from the milling device, at least one second conveying device pivotable, relative to the machine frame and/or the first conveying device, about a horizontal pivoting axis in a predetermined inclination angle range, and laterally about a pivoting axis extending in vertical direction, wherein the first conveying device transfers the milled-off material to the second conveying device, a transfer element with a first transfer opening essentially coaxial to the vertical pivoting axis and open towards the bottom is arranged at the first conveying device, a reception element with a reception opening open towards the top is arranged at the second conveying device, it is provided a lid element covering at least the major part of the reception opening arranged at t
