Apparatus for producing duplex copies

Apparatus for producing simplex or duplex images on a copy sheet, said apparatus comprising:

• a movable photoconductive member;
• means for forming unfixed transferable toner images on said photoconductive member;
• first and second toner image transfer stations located in transferable relationship with said photoconductive member for transferring said images from said photoconductive member to a copy sheet;
• means for moving a copy sheet along a copy sheet path located between said first and second transfer stations and including a plurality of vacuum rollers including at least a first roller located adjacent to said photoconductive member and a guide member associated with said vacuum rollers;
• said vacuum rollers being operable in synchronism with said movable photoconductive member and being rotatable when duplex images are produced on a copy sheet in a first direction for attracting by vacuum a copy sheet separating from transfer relationship with said photoconductive member and to one side of which copy sheet a first transferable image has been transferred at said first transfer station, and for moving said copy sheet over said guide member along said path away from said photoconductive member and being rotatable in a second opposite direction after said copy sheet has been separated from said photoconductive member so as to invert said copy sheet while said first image is unfixed to move said copy sheet over said guide member along said path toward said photoconductive member for bringing the second side of said copy sheet into transferable relationship with said second image on said photoconductive member at said second transfer station and when a simplex image is produced on a copy sheet in said second direction to move a copy sheet over said guide member toward said photoconductive member to bring a side of said copy into transferable relationship with an image on said photoconductive member at said second image transfer station.