like guide member 31 this member is somewhat semi funnel shaped and has sides 32 which slope upwardly as indicated in fig3 from a low point indicated at 33 at the low point 33 of the guide member 31 i place a sensor indicated by the numeral 34 while various types of sensors may be adequate for the purposes at hand i prefer to use a photocell type device which carries its own energy emitting source 36 and an energy responsive element 37 in practice i have found that a photocell sensor manufactured by optron inc 1201 tappan circle carrollton tex 75006 identified as its part no opb730f is entirely suitable suffice it to say that the object of the sensor is to establish a field of influence adjacent the 34 neck 34 of the funnel shaped member 31 so that upon the presence of a broken or mis drafted end or sliver s 1 in said area a signal is generated by the sensor see fig1 in order to prevent the giving of false signals due to the passage through said zone of influence of fly trash or dirt the sensor 34 is in circuit with time delay means referring particularly to fig7 of the drawings i show the sensor 34 diagrammatically in circuit with devices capable of providing the delay thus within the control box 41 or elsewhere if desired i feed the signal from the sensor 34 to a shaper timer indiated at t 1 the.