Conveyor, particularly a conveyor for materials in the shape of fibres lying in a sheet, said conveyor comprising at least two consecutive conveying elements at least one of which is movable and between which there remains a space; at least one movable member extending in said space cross-wise to the lengthwise axis of the conveyor; and moving means for imparting to said movable member a motion on either side of the median plane of said space between four end positions as follows: a first end position in which the member takes over the material falling in said space, a second end position in which said member lays the material having entered said space in such a position that said material will be taken over by the second conveyor element to pursue the conveying thereof on said conveyor, and two intermediate positions in which said member is situated in the proximity of the conveyor movable element and the second conveyor element; said means for moving said movable member being arranged so as said member and said conveyor movable element are driven in the same direction and so as said member defines a continuous curve in passing from one position to another.