Abstract: A transport mechanism is disclosed for transporting a document around a track in a groove. A boundary wall in the form of a continuous wall or an array of guide cylinders is provided on the outside of a corner around which the track passes. A breaking cylinder which is rotated with the same surface velocity as the document constricts the document against the boundary and opens out any longitudinal folds therein to reduce the mechanical strength which they cause in the document. A drive mechanism then flattens the document against the boundary and renders the document flexible for the continuation of its transportation around the curved track. Dog-ears on the leading edge of a document are conditioned to prevent their causing impediment to further document transportation either by being folded back against the document or by being folded back into the plane of the document.