on the roller drafting apparatus even the cross sectional form plays a certain part here it can be circular in accordance with fig2 however it turned out that cross sectional forms like the ones shown in fig1 or in fig3 and 4 avoid the accumulation of fibers under apron covering 1 the best however it is still important that the cross sectional circumference u is sufficiently large that the fibers cannot form a ring around deflection rail 2 fig3 shows for example a cross section in which apron sliding surface 27 has the form of a circular arc whereas the flanks are flattened in deflection rail 2 according to fig1 the cross section of deflection rail 2 is rectangular however the small sides are rounded off in an arched form so that apron sliding surface 27 is rounded off in the embodiment according to fig4 apron sliding surface 27 of deflection rail 22 is also rounded off however the sides are maintained straight this cross sectional form is particularly resistant to pressure loads and offers a smaller apron sliding surface 27 so that less friction is exerted on apron covering 1 as can be gathered from fig1 a clearer roller 5 is advantageously arranged above pressure cylinder 3 in order to keep apron covering 1 free of fibers on its outside fig5 shows the holder 4 with two deflection rails 23 arranged as a pair holder 4 has cheeks 41 with which it rests on shaft 65 of pressure roller 3 cheeks 41 are designed in one piece with the two deflection rails 23 deflection rails 23 comprise cylindrical apron sliding surfaces 27 with.