A document processing arrangement transporting checks or like financial documents at a prescribed nominal speed along a track, terminated by sort-pockets, each with an associated diverter plus a guide assembly for guiding anddriving a so-diverted document into its pocket, the guide comprising an inject roll to accelerate the document, plus an arm-assembly coupled to rotate with the roll and including an arm for guiding a so-injected document toward its position in the pocket-stack; this roll and arm assembly being arranged to rotate the arm away from its stack each time a document is entering, and also to be spring-driven to return the arm toward its stack.