Abstract: A control system for controlling a motor driving a separator roller of a collation-feeder stager assembly in an inserter system including one or more enclosure feeders, the collation-feeder stager assembly including a following roller assembly having a first and a second, following, set of rollers, the control system comprising: an edge sensor, disposed so as to have a line of sight suitable for sensing the arrival, between the first and second set of the following roller assembly, of a leading or trailing edge of a collation, and for providing signals indicating the arrival of the edge; and a controller, responsive to the signals indicating the arrival of the edge, for determining a motion control profile for the motor designed to maintain within a predetermined range a gap between collations based on having the controller decelerate the separator roller upon receiving a leading edge signal from the edge sensor.