The mobile, height adjustable Four-directional Knife Folding Unit supplements buckle plate folding machines as well as combination folding machines. When used as third unit of a buckle plate folding machine, an operator friendly U-configuration minimizes walking distances. With low investment costs, additional folding schemes and particularly thick products become processible. The Four-directional Knife Folding Unit is swivel-mounted and allows you to offer folding schemes like the international quadruple fold.