An apparatus and method separate flat articles, in particular flat mail consignments, and have built-in wear compensation. The apparatus possesses a transport element, a retention element, a displaceable mounted base and a range sensor. Either the transport element or the retention element is mounted on the base. The other element is mounted fixedly. The transport element is moved in relation to the retention element, with the result that overlapping articles are drawn apart from one another. The range sensor measures the length of a section from a fixed point to such a surface of the transport element which comes into contact with articles. In dependence on the measured section length, the base is displaced in such a way that the displacement of the base compensates for abrasion of the transport element.