Document or copy sheet tray sheet set sensor actuator

A sheet feeding system for an imaging system with a sheet input tray into which sheets are loaded onto the upper surface to be fed downstream, with a sheet sensing system for automatically providing different electrical control signals in response to different sheet sizes and different orientations of the sheets loaded into the tray, with sensor actuators projecting into the tray at different preset positions, each actuator being movably mounted to normally project upwardly through an aperture in the tray until operatively engaged by the sheets loaded onto the sheet input tray extending over the preset position of the actuator. Each actuator has an operative shape tapering upwardly from a relatively large base to a relatively small tip to provide laterally angled sheet engagement surfaces on at least three lateral sides thereof, preferably pyramid shaped. These surfaces are sufficiently angled to push down the actuator and prevent jamming or damage to the actuator from stocks of sheets being manually inserted into the sheet input tray from different angles and directions, especially, laterally.