Device at a drafting arrangement of a spinning preparation machine, in particular, draw frame, card, comber, Lapwinder o. The like.

摘要

In an apparatus in a drafting arrangement of a spinning machine, particularly draw frame, card, combing machine, Lapwinder o. The like., For stretching of one or more slivers, with at least two successively arranged pairs of rolls, the upper rolls are pressed by biasing means against the lower rollers, with at least one cylinder with movable axially arranged inside a cylindrical casing load and relievable piston (18), of which a piston rod for top roll back starts in which a sensor arrangement is provided for determining the position of the piston with the piston rod, there is a on the piston rod side remote switching element (24) with the piston (18) in connection. In order to enable a self-winding detection with a desired spacing of the switching element (24) to the switch is a magnetorheological substance (26) arranged between one end of the switching element and the piston (18) which cooperates with an electromagnetic coil, the biasing means is a spring such as compression spring.