a device for aligning sheets on a feeder of a sheet - processing machine includes a plurality of pivotably disposed front lays and a plurality of pivotably disposed top lays , the top lays being vertically adjustable . the front lays and the top lays are respectively assigned to and combined with one another and have a common pivoting drive . a push rod vertically adjusts the top lays , and a wedge - like slide actuates the push rod .