A supply device (3) for supplying substrate strips (10, 10′; 11, 11′) to a double-belt press (2) for pressing the substrate strips (10, 10′; 11, 11′) together includes unwinding stations (4, 5) each having an unwinding shaft (6, 7) for receiving a substrate strip roll (8, 9) and serving to unwind the substrate strips (10, 10′; 11, 11′) from the substrate strip roll (8, 9), at least one of the unwinding stations (4) having a force-measuring device with a measuring shaft (16, 17) around which one of the substrate strips (10, 10′; 11, 11′) can be wrapped, an auxiliary shaft (18, 19) being assigned to the measuring shaft, wherein the auxiliary shaft (18, 19) and the measuring shaft (16, 17) of the unwinding station (4) are moveable relative to each other between a guiding position for guiding the substrate strip (10, 10′; 11, 11′) from the roll of the substrate strip rolls (8, 9) through a gap between the measuring shaft (16, 17) and the auxiliary shaft (18, 19) and an operating position defining a pre-defined and/or pre-definable wrap angle (χ) of the substrate strip (10, 10′; 11, 11′) around the measuring shaft (16, 17) by an adjusting drive.