Abstract: A stapling machine, whose arms, of which one carries the stapling head and staple magazine and the other an anvil for bending them into shape, are constructed in a single piece body and are linked together about a weakened joint area with at least two leaves acting upon it or upon a cross stiffener in the same plane or at an angle to one another, and said arms being provided also with a guide arrangement which prevents any sideways bending between the arms. The stapling head incorporates in a frame with which it provided, a travelling assembly that consists of a front plate and cover which slide in guides provided on the frame, and are provided with a positioner whose flanges are capable of being housed within recesses in the front walls of said guides so that in the event of any jamming of staples inside the machine, the travelling assembly can be placed at an intermediate disassembly position.