Abstract: The present invention relates to a punch device for punching a stack comprising at least one sheet of paper, comprising: —a frame; —at least one guide element for guiding the stack to a punching position; —at least one punch element for co-action with a respective punch plate element and which is mounted movably on the frame, wherein the punch element is movable reciprocally from a rest position along a punching path; and —an operating element for moving the punch element selectively along the punching path, —wherein the punch device is adapted to punch at least one recess in an cutting face of the stack.

Abstract: A binding system (1) comprising a stack of sheet (2), each with a binding side (3) with attachment means for the connection of the sheets. The binding side of a sheet possesses an alternating sequence of tabs and notches. One sheet can be attached to an adjacent sheet by interlocking its tab (4) into the notches between the corresponding tabs of the adjacent sheet. The tabs fit exactly into these notches to provide a seamless connection between these sheets. Thus this binding system provides for a quick, user-friendly binding system without requiring separate and cumbersome attachment means.