Loader of signatures or sheets with scale-shaped arrangement comprising a retractable plane (10) onto which a small stack (7) of signatures or sheets (3) is deposited, which is unloaded onto the plane (2null) of a feeder (2) after the retractable plane (10) has moved back. The latter is located at a minimum difference in height relative to the horizontal upper part (5null) of a conveyor belt (5) of the signatures or sheets (3) coming from the loader (1) and at a short distance from the plane (2null) of the feeder