Method and device for influencing the course of the edges of a felt or screen web in paper machines

摘要

Arranged on both sides of a felt or screen web (1) is a mechanical scanning device (7) which can be actuated by the edges (6) of the web (1). Situated in each case between one edge (6) and one mechanical scanning device (7) is a contactless scanning device (9) which exerts oscillating correction strokes on the bearing of a tensioning and regulating cylinder. In the case of failure of the function of the contactless scanning device (9), the mechanical scanning device (7) replaces the control by a proportional regulation. <IMAGE>