An inserting system for inserting documents into an envelope. The system comprises: an inserting chassis; a device to convey documents from an upstream location on the chassis to a downstream location on the chassis; an insertion station for inserting the documents into a waiting envelope; a feeder located adjacent the inserter chassis for feeding documents to the conveying device, the feeder having a hopper for storing the documents; a forms unwinder located adjacent the feeder, the unwinder having a pivotable support arm; a roll of shingled documents mounted on the support arm; a device for unwinding the roll and separating each succeeding document seriatim; and a device for feeding the separated documents into the feeder hopper. In an alternative embodiment of the instant invention, the foregoing elements of the invention are the same except that the unwinder is used to store and unwind envelopes.