In an insertion machine a track 20 moves groups of items past feed station 31, 32, 33, 34, 35, 36, 37, 38, 39, during respective machine cycles. The feed stations selectively feed items onto the tracks 20 for inclusion with a group of items and eventual stuffing into an envelope. A master control item...http://www.google.co.uk/patents/US5177687?utm_source=gb-gplus-sharePatent US5177687 - Insertion machine with postage categorization and selective merchandising
