a device for fixing the position of a sheet includes a feeding table for transporting the sheet ; at least one front lay disposed in vicinity of the feeding table and , in a working position , protruding upwardly beyond the plane of the feeding table ; a swivellable holder to which the front lay and an adjusting device for the front lay are secured ; and a adjusting device secured to the holder , the front lay and the adjusting device being disposed separated from one another on the holder , the front lay being in continuous biasing engagement , under tension , with the adjusting device , so that , by changing the position of the holder , the front lay and the adjusting device are movable from the working position into a neutral position and , conversely , from the neutral position into the working position .