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AssigneeDeutsche Institute fur Textile-und Faserforschung Stuttgart
InventorsPeter Artzt, Heinz Muller
Estimating the term…
The coating of the pressure roller (3) of a drawing roller frame for spinning frames comprises an outer layer and an inner layer fixed to the core of the pressure roller. The outer layer is thinner and harder than the inner layer and is embodied as an endless belt (1) which loosely surrounds the inner layer such that the belt can be displaced in relation to the inner layer. In order to improve the running of the belt, the belt is guided over a deflector rail (2), the cross-sectional area (u) of the rail being wider than the average staple length of the fibre material (F) drawn on the drawing roller frame. Furthermore, the belt is designed in such a way that it comprises a double thread interlining, one thread interlining being wound counter to the second thread interlining such that the threads of one thread interlining cross the threads of the second thread interlining.
A method of drawing a fiber structure to a yarn for a spinning machine having a roller drafting apparatus that defines a drafting field for fibers having a known average staple length, the roller drafting apparatus having a middle pressure roller that is looped around by a drafting apron that is guided and tensioned by an apron cage, the roller drafting apparatus having a pressure roller and opposed lower cylinder at the output of the drafting field, the pressure roller having an inner layer fastened around a core of the pressure roller, wherein an endless cover apron travels in a running path over the pressure roller and a deflection rail, the cover apron formed as an outer layer that loosely surrounds the inner layer of the pressure roller, the method comprising:
An endless apron for use in a roller drafting apparatus for a spinning machine that defines a drafting field for fibers having a known average staple length, the drafting apparatus having a pressure roller and opposed lower cylinder at the output of the drafting field, the pressure roller having an inner layer fastened around a core of the pressure roller, wherein the endless apron travels in a running path over the pressure roller and a deflection rail, the apron formed as an outer layer that loosely surrounds the inner layer, the apron further comprising:
Dependencies are inferred from the claim text.