For conveyance of mowed material a conveyor device comprised of a conveyor belt (26) is employed between the mowing mechanism and collection container. The conveyor belt (26) is comprised of two equally paced oppositely driven endless conveyor belts, which run about drive (40, 44) and guide rollers (36, 46), which are mounted on horizontal axles (41, 47, 53). The conveyor belts (32, 34) exhibit two conveyor segments (56, 58) which are parallel and lie opposite to each other, which in the absence of mowed material to be conveyed (22) lie against each other, which receive mowed material (22) from the mowing mechanism (14) and of which the spacing with respect to each other can be increased by the mowed material (22) and of which their respective separation is increased by the spreading force of the mowed material (22) against the spring force (54).