control circuit controls the drafting of the fiber sliver through the drafting rollers whereby the fiber structure is clampingly held between drafting roller pairs and sensing roller pair during stoppage whereby a pulse generator is able to produce impulses for the rotation of a pair of sensing rollers which are transmitted to an electronic memory during stoppage of the drafting equipment and whereby the association of data and momentary position of the sliver events is maintained in the electronic memory during stoppage of the drafting equipment during stoppage each impulse of the pulse generator is detected and evaluated by means of an electronic system on the connection between pulse generator and electronic memory application_number US 69490296 A description reference will now be made in detail to the presently preferred embodiments of the invention one or more examples of which are illustrated in the drawings each example is provided by way of explanation of the invention and not meant as a limitation of the invention for example features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment it is intended that the present invention cover such modifications and variations fig1 shows a detail of the open control circuit with the measuring element the measuring element is a pair of sensing rollers 1 1.