A newspaper-printing machine folder has two pairs of nipping rollers and one pair of folding rolls. The rollers of each pair are held against one another under the pressure force of a spring or the like elastic means. The setting of the position of the rollers is adjustable according to the thickness of the product to be folded. Additional pressure force balancing devices are provided on the rollers. Sensing elements are arranged for detecting of differences of the roller pressure, controlling the motive power-operated adjusting devices for resetting the roller position to the originally set force.