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Browse Prior Art Database

DOCUMENT HANDLER STAPLE DETECTOR

IP.com Disclosure Number: IPCOM000026406D
Original Publication Date: 1991-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 79K

Publishing Venue

Xerox Disclosure Journal

Abstract

A metallic non-contact staple detector system for automatically detecting the presence of staples within a set of original documented sheets loaded into a document handing tray and automatically inhibiting the operation of a document feeder to prevent damage to the feeder or original sheets is disclosed. This system can be used in a copier or other document imager having an automatic document feeder.

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XEROX DISCLOSURE JOURNAL

DOCUMENT HANDLER STAPLE Proposed Classification DETECTOR U.S. C1.353324 Thomas Acquaviva Int. C1. G03g 21/00

A metallic non-contact staple detector system for automatically detecting the presence of staples within a set of original documented sheets loaded into a document handing tray and automatically inhibiting the operation of a document feeder to prevent damage to the feeder or original sheets is disclosed. This system can be used in a copier or other document imager having an automatic document feeder.

The system may be utilized with a suitable, conventional or other printed circuit or other coil oscillator metal detector to detect the metallic staple. The detector can be located in underlying area of the document tray, thus allowing no physical contact with original documents. The system can be operated by a conventional integrated circuit for establishing a weak magnetic or radio frequency field. A conventional threshold detector or trigger level circuit can detect a change in the inductance or load in the field of the oscillator coil indicative of a detected metal object of any kind. In a preferred embodiment, the system can be preset or specially tuned to be triggered by a metal object of the same mass and/or size of a conventional standard metal staple. Furthermore, the field sensitivity of the metal detector is preferably set to respond to a metal object within less than approximately one inch of the metal detector and tray sur...