of each feed tray segment 7a is ensured by the weakening notches 7 5 provided in the connecting part 7 3 in the vicinity of its securement 7 1 turning to fig6 the required clamping forces for holding the fiber material against the opening forces of the after connected opening roll 8 are applied in addition to the inherent resiliency of the feed tray segments by a respective further spring 28 such as a compression spring which is positioned between a rearward face 7 34 of each feed tray segment 7a and the carrier beam 35 the inherent resiliency of the feed tray elements is obtained by the particular configuration of their elastic material such as steel aluminum synthetic material or wood in fig7 the pressing spring 28 of each feed tray element 7a is positioned as close as possible to the maximum pressure location in the pressing zone for the fiber material the graph of fig7 a shows the pressure displacement p s curve as shown in fig8 in the feed tray body 7 2 of the individual feed tray elements 7a and in the carrier beam 35 respective recesses 7 6 and 35 1 are provided for receiving the respective ends of elastic elements such as springs 28 according to fig9 the elastomer spring for example the rubber spring rod 36 which extends over the width of the machine is glued to the feed tray segments 7a in fig1 as an elastic element a composite component is used which is formed of a rubber spring 36 bonded to a metal element 40 which in turn is attached to the carrier beam 35 as shown in fig1 the elastic element may be a hollow rubber bar 36 fig1 shows how all the feed tray elements 7a.