The shaping machine for circular bales of crop material has straps (belts) (12) continuously passing around a plurality of rollers (2 to 11) in a movable housing (1, 1a) which can be tilted open, forming and defining a coiling chamber (13) and having a crop material inlet (14) for the retrieved and conveyed crop material (15) between two lower rollers (2, 3) disposed at a distance from each other. A rotor (17) is disposed in the crop material inlet (14), which conveys the crop material (15) into the coiling chamber (13) while compressing the crop material, and closes off the inlet (14) at the bottom.