Output station for reproducing machine

An output station for a reproducing machine comprising a sorter including a plurality of copy sheet collecting trays arranged in a vertical array, sheet transport means to transport copy sheets from the reproducing machine to the sheet sorter, said sheet transport having an entrance portion adjacent said reproducing machine and a sheet exit portion adjacent said sorter, said individual copy sheet collecting trays being mounted in a vertical array on an elevating means and including means to drive said elevating means vertically upwardly and downwardly past the sheet exit portion of said copy sheet transport to facilitate the sequential insertion of the copy sheet from the copy sheet transport to the individual trays, each of said copy sheet collecting trays also being pivotally mounted to said elevating means for individual pivotal movement about a vertical axis and further including means to sequentially swing said individual copy sheet collecting trays containing sets of collated sheets in an arc about said vertical axis from the sheet collecting position adjacent the sheet exit portion of said sheet transport to a finishing station, means to deliver finished sets of collated copy sheets to a finished set unloading station, said copy sheet collecting trays having means to corner register individual copy sheets as they are inserted in the individual copy sheet collecting trays and means to maintain the corner registration of the sets of collated sheets as they are transported from the sheet collecting position to a finishing station.