the drafting unit and an arrangement for continuously determining during operation optimal points of regulation based on the signals application_number US 13159602 A description fig1 illustrates the feeding device of a roller card unit or a carding machine which may be a high performance dk 903 model manufactured by tr u00fctzschler gmbh amp co kg m u00f6nchengladbach germany the fiber batt 6 is advanced to a licker in 5 by a feed roller 4 in cooperation with a feed table 42 the processing direction is designated with the arrow a the mass of the sliver 6 entering the nip defined between the feed roller 4 and the feed table 42 is detected by a sensor 1 whose signals are applied to a regulator 2 the latter in turn applies its signals to a drive 3 for rotating the feed roller 4 the rpm of the feed roller 4 is varied by the motor 3 as a function of the signals applied thereto by the regulator 2 fig2 shows a carding machine in which the licker in 5 transfers fiber material to the main carding cylinder 8 thereafter the fiber material is taken over by a doffer 9 cooperating with a stripping roll 10 subsequently the material passes between crushing rolls 11 12 a sensor 7 positioned downstream of the crushing rolls 11 12 monitors the mass of sliver outputted by the carding machine the sliver after passing the sensor 7 travels through a non illustrated drafting unit the signal from the sensor 7 representing the sliver mass is utilized for the long term regulation by virtue of the fact that the signal representing the sliver mass.