Electrophotographic copying apparatus for two-sided copying

Abstract From the Canadian patent

In an electrophotographic copier having a given paper travel path from supply to exit, apparatus to enable the copier to automatically make two-sided copies. An auxiliary tray is positioned to selectively receive copy sheets from the exit hopper during the two-sided copying mode of operation. The tray is pivotable about an axis located just above the primary sheet supply. When it is desired to accomplish two-sided copying, sheets upon which first-side copy have been made are directed into the auxiliary tray with the first-side copy face of the sheets oriented opposite to the original orientation in the primary supply. The tray is then pivoted so that it overlies the primary sheet supply. …