cross sectionally semicircular the height h 3 of the tooth gap 1 39 7 is approximately 0 6 to 1 5 mm whereas the tooth division t is for example approximately 2 45 to 2 85 mm in the straight wire as shown in fig5 d the bottom of the tooth gap 1 39 10 is approximately semicircular fig5 b shows the sawtooth clothing 1 39 in a sectional view in which the line of sight is perpendicular to the roll axis which lies in the drawing plane of fig5 b fig5 b shows two teeth 1 39 1 which are thus axially spaced and which belong to two adjoining turns of the wire helix wound on the feed roll 1 the pitch between the two teeth is designated at p further between the clothing helix a spacer wire 31 is helically wound on the roll body it is feasible to omit the spacer wire 31 as illustrated in the variant shown in fig5 c in such a case no space between adjoining turns of the clothing helix is present the axially measured tooth point width b s of the tooth 1 39 1 may be for example greater than 0 2 mm and smaller than 1 mm the axially measured foot width b f of the tooth 1 39 1 that is the material thickness of the wire may be greater than 1 mm and less than 4 mm for example 2 mm the tooth density t 10 t may be for example about 3 5 to 4 0 teeth cm the pitch number z 10 b f may be about 4 8 to 5 2 cm the tooth density over the surface.