Patent ID: 9217980
Filing Date: 2015-12-22
Classification: G03G

Abstract:
1. A method for preventing damage to a document by a document transport apparatus, comprising a) providing a member for receiving the document as a stack of sheets to be serial fed to a feeding station; b) providing at least two spaced-apart microphones disposed at the feeding station and responsive to audio to produce signals representing audio energy received by each microphone respectively; c) cross-correlating the signals received from the at least two microphones to determine that there is ambient noise or that there are at least two attached sheets being fed or there is a single sheet being damaged, wherein the sheets in the document are attached by staples, paperclips, or adhesives; and d) shutting off the document transport apparatus to prevent damage to documents based upon a determination that at least two attached sheets are being fed or that a single sheet is being damaged.