Device for de-cambering a supporting material

A decurling unit for decurling sheet-shaped carrier material that has a potentially convex or concave curvature along a direction extending parallel to a conveying direction of the carrier material, comprising:

• an element for eliminating convexity in the carrier material, said element for eliminating convexity being adjustable;
• an element for eliminating concavity in the carrier material in series with said element for eliminating convexity, said element for eliminating convexity and said element for eliminating concavity both being traversed by the carrier material to be decurled, the element for elimination of concavity being adjustable;
• and
• a mechanical linkage between said element for eliminating concavity and said element for eliminating convexity so that a decrease of an effect of the element for eliminating concavity occurs given an increase in an effect of the element for eliminating convexity and an increase in the effect of the element for eliminating concavity occurs given a decrease in the effect of the element for eliminating convexity.