Patent ID: 7239340
Filing Date: 2007-07-03
Classification: D01H,H04N

Abstract:
1. A draw frame for drafting a sliver running therethrough, comprising (a) a drafting unit comprising a plurality of roll assemblies spaced from one another in a direction of sliver advance; one of said roll assemblies being an output roll assembly situated at a downstream end of said drafting unit as viewed in said direction of sliver advance; (b) a sliver guide disposed downstream of said output roll assembly; said sliver guide having an inlet opening and an outlet opening; (c) a sliver trumpet disposed downstream of said sliver guide; said sliver passing through said sliver guide and said sliver trumpet; (d) an electronic camera arranged to capture images of the sliver at a location situated downstream of said output roll assembly and upstream of said sliver trumpet; (e) an electronic image evaluating unit connected to said camera for receiving image signals therefrom; (f) an electronic machine control device connected to said electronic image evaluating unit; and (g) a closed circuit, including said electronic machine control device and said electronic image evaluating unit, wherein said electronic machine control device is adapted to adjust and optimize at least one of speed and friction parameters of at least one of the plurality of roll assemblies in response to results of said electronic image evaluating unit via said closed circuit.