Patent ID: 8590694

Claim:
Apparatus for transporting documents in a paper handling system, comprising: a flexible drive train comprising a plurality of chain links; a document transport element connected to the flexible drive train for moving documents, the document transport element comprising an insert pawl extending orthogonal to the drive train and a support member; and means for constraining the flexible drive train to move along a predetermined serial path, wherein the support member extends rearwardly in the direction of travel of the drive train and has a base length extending over at least two chain links, and overlies the drive train to restrain movement of the drive train out of the predetermined serial path, wherein said means for constraining comprise at least one roller connected to the drive flexible train and constrained for uni-dimensional movement within a guide channel, and wherein the support member rests over the top of a chain of the flexible drive train and is angled to cover the width of the chain.