toner powder image to the opposed sides of the copy sheets inasmuch as successive bottom sheets are fed from duplex tray 61 the proper or clean side of the copy sheet is positioned in contact with belt 11 at transfer station p so that the toner powder image is transferred thereto the duplex sheet is then fed through the same path as the simplex sheet to be advanced to finishing station r the high capacity variable sheet size sheet feeder 100 is the primary source of copy sheets feed belt 81 feeds successive uppermost sheets from the stack at nip 83 to a take away drive roll 82 and idler rolls 84 the drive roll and idler rolls guide the sheet onto transport 86 transport 86 advances the sheet to rolls 66 which in turn move the sheet to transfer station p secondary tray 68 and auxiliary tray 72 are secondary sources of copy sheets copy sheets are fed to transfer station p from the secondary tray 68 or auxiliary tray 72 sheet feeders 70 74 are friction retard feeders utilizing feed belts and take away rolls to advance successive copy sheets to transport 64 which advances the sheets to rolls 66 and then to transfer station p the copy sheet is registered just prior to entering transfer station p so that the sheet is aligned to receive the developed image thereon invariably after the copy sheet is separated from the photoconductive belt 11 some residual particles remain adhering thereto after transfer photoconductive belt 11 passes beneath corona generating device 94 which charges the residual toner particles to the proper polarity thereafter the pre charge erase lamp not shown located inside.