A method and device for forming a stack of sheets including a delivery surface, and also a stop and a pusher element movable in the direction of the stop, and also a guide which can occupy a first and a second position, in which the first position a sheet can be received in the guide, and in which the second position a guide path is formed, wherein the freedom of movement of the sheet edge is substantially limited in a direction substantially perpendicular to the pushing direction and substantially perpendicular to the delivery surface of the preceding sheet.