The device (10) has front and rear segments (8, 9) connected with each other for varying conveyance length for an agricultural harvester i.e. field chopper (1). The segments are formed from one-piece U-shaped base bodies (15, 16) comprising a cover-free region. The segments are connected in an overlapping manner in an overlapping region (27) with respect to a flow direction of harvest e.g. grass, in a projection-free manner, where the fixation of the overlapping regions of the two segments takes place outside of the harvest flow.
