a fiber processing system includes a first roll ; a feed tray forming a feeding device with the first roll and defining a clamping location therewith for clamping and advancing fiber material ; a second roll cooperating with the feeding device for taking over the fiber material therefrom at a transfer location on the second roll ; a third roll cooperating with the second roll for taking over the fiber material from the second roll ; and an adjusting arrangement for varying a distance between the clamping and transfer locations . the adjusting arrangement includes a pivoting device for arcuately displacing the second roll about the rotary axis of the first or the third roll ; and a shifting device for displacing the feeding device toward or away from the third roll .