Abstract: A sheet sorting apparatus, used with an image printing apparatus, having a plurality of shiftable trays arranged in a vertical array; a pair of vertically movable cams for shifting the trays and for forming sheet discharge zone; a sheet feeding mechanism; and sheet edge guides, which are vertically movable integrally with the cams, for aligning the sheets deposited on the trays. The sheet feeding mechanism includes a sheet inlet unit, the level thereof is adjustable to meet the sheet discharge level of the image printing apparatus, and a tiltable sheet conveyor which bridges the sheet inlet unit and the sheet discharge zone.