in the opposite direction and which forms a recess 53 together with the front side 48 follows the inclined front side 48 fig6 shows three recesses 52 which are arranged one after the other in waved configuration blade 46 of the mote knife 19 is oriented in a direction opposite to the running direction of cylinder 2 the distance between blade 46 and the surface of cylinder 2 can be adjusted to this end the mote knife 19 has provided thereon elongated holes 54 which are shown in broken line and through which the fastening elements 55 which are designed as screws project for fixing the mote knife 19 in the conventional manner relative to the associated carding segment 10 the operation of the invention shall now be explained in more detail in the following during operation of the carding machine 1 the fiber material 5 which is fed via feed rollers 3 and 4 is carded between cylinder 2 and carding segments 10 dirt trash and short fibers as well as fiber fragments and synthetic fibers are removed on blade 46 of the mote knife 19 and carried away via suction channel 41 and connections 12 it has been found that it is possible to remove dust trash and short fibers or the like in a considerably improved manner when the blade is provided with a rounded section 47 another improvement of the discharging properties of dust trash and short fibers and the like can be achieved when an air current is introduced through the air supply duct 21 to be able to make an adaptation to the respective fiber materials 5 both the mote knife 19 the hold down means 20 and the.