Speed Frame (Simplex) — Roving Production
topic
The speed frame (roving frame, simplex) attenuates drawn sliver to roving at draft ratio 6–12, inserts low twist (TF 0.8–1.4 for cotton) for cohesion, and winds on a bobbin for creel feeding. Delivery speed: 15–30 m/min; roving count: 0.5–2.0 Ne. Speed frame is the most mechanical complex and maintenance-intensive machine in the preparation sequence. Modern machines (Rieter F 36, LMW LF 4280): automated bobbin transfer to ring frame creel, roving stop motion per spindle.
Role
Speed frame quality — specifically roving count variation and roving twist — is the last controllable quality variable before ring spinning. Roving count variation (CVroving%) directly becomes ring yarn count variation unless compensated by the ring frame auto-leveller, which does not exist in standard ring frames. Understanding speed frame quality management is therefore the final preparation quality lever for ring spinning count consistency.