A medium feeding device includes a device body, a tray that regulates and contains a plurality of kinds of media of different sizes in a loading area according to the sizes of the media, and a detection lever that detects whether or not the media are properly loaded in the tray. In a state in which the tray is contained in the device body, when the media are not properly loaded in the tray, the detection lever moves to a non-load detection position. When the media are properly loaded in the tray, the detection lever moves to a load detection position with a front end part being oriented toward the tray containing side, and when a pressing force is applied to the detection lever at the non-load detection position from the tray containing side, the detection lever retreats toward the tray pulling out side.

A method for applying at least one enclosing element to a flat product composition wherein the enclosing element is subsequently applied around a selected edge of the product composition in a perpendicular manner with respect to said edge so as to rest against the product composition. A reliable operation that is independent of the type of enclosing element is achieved in that the selected edge of the product composition is moved forward along a transporting path, the enclosing element is held ready at a specified point of the transporting path so as to intersect the transporting path, the selected edge of the product composition is moved past the specified point, and at the same time the selected edge drives the enclosing element that is held ready.

The invention relates to a method for assembling a stack (10) consisting of single or multilayered pre-products (1115) of equal or different sizes, said pre-products lying freely one on top of the other, wherein the stack (10) has two outer pre-products (11, 15). According to the method, the stack (10) is given a cohesion that facilitates later handling. The cohesion is achieved in a very simple and flexibly applicable manner by providing the slack (10) to be assembled in a first step, said stack consisting of pre-products (11-15) that lie freely one on top of the other, and by attaching at least one connecting element (17) to an edge (16) of the stack (10) in a second step such that said element overlaps the two outer pre-products (11, 15) of the stack (10) in a clamping manner.