Process and device for feeding a material in fibre form in a machine for preparing said material for the subsequent spinning, in particular an opener

摘要

In order to optimize the quality of the material leaving a machine for preparing said material for a subsequent spinning, in particular an opener or a card, the present invention proposes of varying the position of the material feeding table (6) relatively to the preparing roll as a function of the impurity level of the fed material (3). The impurity level is detected by an impurity detector (13) installed upstream the feeding table and continuously operating on the material which is being fed. The data detected, suitably processed, is used in order to govern a servomotor (20) kinematically associated with the mobile support (8) of the feeding table.