a carding system a fiber feeder is provided which includes a blower and an oscillating plate both of which act to compress fiber collected in the chute of the fiber feeder a first sensing device is utilized at the discharge of the fiber feeder to sense the density of the batt being fed therefrom to a card and a second sensing device is utilized at the trumpet of the card to sense the density of the fiber which forms the sliver in such trumpet control means is provided to regulate the operating speed of the blower and the oscillating plate in response to the signals generated by the first and second sensing devices application_number US 43400982 A description a textile processing system is illustrated in fig1 and includes a fiber feeding device 10 which as will be described in greater detail presently receives loose fiber from an inlet duct 12 and forms such fiber into a batt that is fed into a carding machine 14 which in turn forms the fiber into a sliver that is delivered through a trumpet 16 to a coiler 18 the fiber feeding device 10 is generally similar to the fiber feeding device disclosed in greater detail in co pending u s patent applications ser nos 336 016 filed dec 30 1981 now u s pat no 4 394 790 and 340 635 filed jan 19 1982 now u s pat no 4 476 611 and includes an inlet feed roll 20 operated by motor 22 and an opening roll 24 operated by a motor 26 a chute 28 is provided for collecting fiber delivered.