1. An apparatus for the optimization of the adjustments for regulation of a spinning works machine with a regulated draw frame, inparticular, a regulated draw frame machine ( 1 ), a carding machine or a combing machine, to which are continuously fed one or more fiber bands ( 2 ), said apparatus having at least one sensor 3 situated ahead of the draw frame for the capture of values of the band thickness of the one or more infeeding fiber band ( 2 ), with at least one sensor ( 30 ) located at the delivery end for the determination of the value of the band thickness of the resulting fiber band ( 2 ′) in a first draw frame machine as well in a second specified draw frame machine, whereby the second draw frame machine does not represent the normal delivery speed of the draw frame, and having a microprocessor ( 14 ; 14 ′) for the comparison of the values captured by the at least one delivery end sensor 30 with the at least two draw frame machines, and having a control and/or regulation unit ( 10 ) for the adaption of the regulatory adjustments on the basis of such machine characteristics and/or fiber band material characteristics as influence measured values.