linings 4 is known very well in the prior art and will not be described in detail in the present connection from arrow b it can be seen that the main cylinder 2 rotates clockwise on the left hand side an opening cylinder 5 is schematically shown said opening cylinder 5 supplying the fibres to the main cylinder 2 also for this purpose known opening cylinder devices can be used the prior art discloses a sufficient number of examples on the opposite side a doffer cylinder 6 is provided this doffer cylinder 6 schematically represents the doffer device which removes the carded fibres from the main cylinder 2 and carries them off for further processing also as far as these doffer devices 6 are concerned the prior art discloses a sufficient number of examples which need not be discussed in detail on the outer circumference at least in the upper area thereof in the portion between the opening cylinder 5 and the doffer cylinder 6 a plurality of fixed carding segments 7 to 10 is provided the carding segments being arranged one after the other each of these carding segments 7 to 10 is arranged at a certain distance above the circumferential surface 3 of the main cylinder 2 in addition the segments are also adapted to the contour of the main cylinder 2 and have therefore an arcuate shape the lower surfaces of said segments being arranged always at the same distance from said circumferential surface 3 as far as possible these carding segments 7 to 10 are provided with toothed linings.