receiver 6 constantly emits a light ray which is reflected back to the receiver by the reflector 7 this is the monitoring section when this light path light barrier is interrupted the draw frame is stopped i e the intake of fiber slivers also comes to a stop because of the relatively low weight of fiber slivers and the very high sliver intake speeds sliver breakage could not be detected with certainty in the past often broken fiber sliver ends reached the drop level necessary to interrupt the monitoring section light barrier only after the monitoring device fig3 shows the arrangement of a monitoring device between feeding device and draw frame in the present instance the feeding device is shown in detail as a roller feeder fig3 shows in detail the utilization of a deflection device according to the invention in proximity of the monitoring device a deflection bar 60 or 61 with circular or elliptic cross section was used as the deflection device it is also possible to use a pipe low friction material is used the monitoring device consisting of optical emitter receiver 6 and optical reflector 7 is therefore installed in combination with the deflection bars 60 61 the deflection bars are at a right angle to the conveying path of the fiber slivers before the monitoring device i e the fiber slivers pass the deflection bars before coming into proximity of the monitoring device as fig4 shows specifically for fiber sliver 1 the deflection bar 60 deflects the fiber sliver 1 from its original position to fiber sliver 1 39 this deflection.