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FLUORESCING DOCUMENT BELT

IP.com Disclosure Number: IPCOM000023815D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 288K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the design of document belts for automatic document handlers to automatically feed original documents to the platen of a copy machine, a number of problems are encountered. In the case of vacuum belt systems where the belts are perforated,

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XEROX DISCLOSURE JOURNAL

FLUORESCING DOCUMENT BELT Proposed Classification Eugene Behun U.S. Cl. 27 1/194

mt. Cl. B65h 29/24

In the design of document belts for automatic document handlers to automatically feed original documents to the platen of a copy machine, a number of problems are encountered. In the case of vacuum belt systems where the belts are perforated,

the perforations can readily show through the lighter weight papers and even through some 20 lb. papers. The fundamental problem resides in the fact that the belts are made of a white material to minimize or eliminate printout around the edge of the document, yet the holes are effectively an optical black body since they open into a vacuum plenum typically unilluminated,

Amelioration of this difficulty is possible in slit-scan copying systems by introducing a white surface spaced a short distance behind the holes in the vacuum plenum. With dual lamps closely spaced to the exposure slit, sufficient light

penetrates the holes to be reflected back and effectively lower the contrast between the hole and the belt to limit show-through. The problem is not readily resolved in this manner for other systems. Attempts to back light the holes have also not been entirely successful since the amount of back lighting necessary is a

function of both the transmissivity of the document and the level of the illumination source for elimination of show-through while only related to the source for the elimination of show a...