US Patent 7570384 Method of printing with a duplexed printhead print assembly

A method of printing with a duplexed printhead print assembly having first and second print engines arranged in an opposing in-line sequential configuration along a paper path. The method includes the steps of pushing a top sheet of paper from a paper tray of the print assembly past a paper sensor of the first print engine of the printhead, drawing said sheet into the first print engine, and sensing a position and size of the sheet using the paper sensor. The method also includes the steps of printing image data onto the sheet via the first and second print engines, and binding the printed sheet into a document using a binding assembly of the print assembly.