Patent ID: 7680448

Claim:
A printing system comprising: one or more pairs of marking engines, each pair of marking engines comprising two substantially vertically aligned marking engines, wherein the respective input and output oaths associated with the substantially vertically aligned marking engines are substantially vertically aligned, and each pair includes an upper marking engine and a lower marking engine; an input and output intersection transport associated with each pair of marking engines and operatively connected to the respective upper and lower marking engine inputs and outputs; and a single horizontal transport operatively connected to the input and output intersection transports, and directing media in a forward direction from the input intersection transport to the output intersection transport, wherein the input intersection transport is adapted to accept input media sheets from a common input and direct the input media sheets to the upper marking engine, the horizontal transport and the lower marking engine, and the output intersection transport is adapted to direct media sheets from the upper marking engine, the horizontal transport and the lower marking engine to a common output; and wherein the horizontal transport is bidirectional and the output intersection transport is further adapted to direct media sheets from the upper marking engine and lower marking engine to the horizontal transport operating in reverse, and the input intersection transport is further adapted to direct media sheets to the upper marking engine and lower marking engine from the horizontal transport operating in reverse.