Abstract: A system for the automated insertion of documents into envelopes. The system includes a plurality of individual document feeding devices that feed individual documents from an assembled stack onto a moving document conveyor. Each of the document feeding devices includes a suction device that pulls the lowermost document into contact with a discharge nip formed between a pair of opposed rotating belts. After being deposited onto the document conveyor, each of the documents enters into a pusher assembly in which each of the documents is accelerated and pushed into an open envelope positioned adjacent to the discharge end of the document conveyor. The stack of opened envelopes is fed by the combination of an envelope feeding device and an envelope conveyor section. The envelope feeding device receives a stack of closed envelopes and feeds and opens each envelope before it is stacked adjacent to the discharge of the document conveyor.