The present invention is directed generally to a folder apparatus for sheets, and more particularly an improved knife folder. In an embodiment, the folder comprises an inducer which is repositionable between a first position and second position, and an idler roller. In the first position the idler roller and a fold roller form a nip. The inducer further comprises a blade adjacent to the idler roller. A first side of the blade and another fold roller define a portion of the feed path adjacent to the another fold roller. When the inducer is in a second position an auxiliary feed path is formed and the sheet may travel along the auxiliary feed path and subsequently be buckled by the blade when the inducer returns to the first position.