Apparatus on an autoleveller draw frame for fibre material for direct determination of index values for the regulation starting point

摘要

The apparatus includes a control system for the draw frame which is adjustable in respect of the draft of the sliver and which comprises at least one pre-control means for modifying the draft regulation of the sliver 5. The optimised regulation starting point is determinable in a pre-operational test run or setting run of the draw frame in which, from the drawn sliver, a number of measured values of at least two quality-characterising variables, preferably CV values, are recorded which relate to a common regulation starting point of the quality-characterising variable. These measured values are combinable to form a quality index and from a number of quality indices a function is determinable, the minimum of which produces the optimum regulation starting point for the control system of the draw frame.