the direction of the double headed arrow 15 in order to adjust the desired thickness of a fiber feed or fiber batt a further rotatable roll or roller 16 is provided upstream of the take up or delivery roll or roller 13 and is arranged in spaced relationship with respect to the take up or delivery roll or roller 14 this further rotatable roll or roller 16 performs a guide function for the cotton flocks in the flock chute or shaft 11 a fiber batt or web 17 produced by the take up or delivery rolls or rollers 13 and 14 is conducted instantly downstream of the take up or delivery rolls 13 and 14 between clamping means and a counter element here shown as two clamping rolls 18 and 19 which serve to clamp the fiber batt or web 17 in the event of any interruption or stoppage of the manufacturing process and thus prevent any further conveyance of cotton flocks the take up or delivery rolls 13 and 14 are stopped during this operation in normal operation the fiber batt or web 17 then passes on through an exit slot or opening 21 located at the bottom end of the flock chute housing 12 and over a guide plate 22 to an arrangement or array of heatable.