Patent ID: 7393314

Claim:
A folding former of a folder for folding a section of a printed product in printing press, the section having a number of pages, said folding former comprising a former nose arranged at a bottom end of said folding former and defining a former inclination angle (β) and a former spread angle (γ), said folding former being pivotably arranged for pivoting about a pivot point or a pivot axis for displacing the former nose horizontally and thereby changing the former inclination angle (β), the former spread angle (γ) being changable as a function of the former inclination angle (β), wherein the former inclination angle (β) and the former spread angle (γ) are set as a function of the number of pages in the section to be folded, whereby outer edges of the section to be folded in the folding former are aligned with other sections of the printed product, the former inclination angle (β) and the former spread angle (γ) being set according to the following equations: K = Δ ⁢ ⁢ S * k 1 sin ⁡ ( β ) ; β new = β + arctan ⁡ ( K k 2 ) ; and γ new = 2 * arctan ⁡ ( cos ⁡ ( β new ) ) . where β is the former inclination angle of of the folding former when the folding former is set at a reference position for a reference section having a reference number of pages, γ is the former spread angle of the folding former when the folding former is set at the reference position, S is the deviation of the number of pages of the section to be folded in the folding former from the reference number of pages of the reference section, k 1 is a constant depending on the layer thickness of the section to be folded, k 2 is a constant depending on the distance between former nose and pivot point or pivot axis, K is the amount that the former nose is displaced during adjustment of the former from the reference position to the a position to be used for the section to be folded, β new is the former inclination angle of the folding former at the position of the folding former to be used for the section to be folded, and γ new is the former spread angle at the position of the folding former to be used for the section to be folded.