Browse Prior Art Database

Double Document Separator

IP.com Disclosure Number: IPCOM000076141D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 3 page(s) / 39K

Publishing Venue

IBM

Related People

Massey, JH: AUTHOR

Abstract

Multiple fed overlapping documents are separated, whereby one document is allowed to continue along a normal feed path to a work station and the other document is shunted to a document stacker. In Fig. 1, documents, including letters or other pieces of mail, normally enter de-doubling station 10, one at a time, in seriatim, and pass therefrom through aligner station 15, to a work station, such as a read station, not shown. However, misfeeding can occur where two overlapping documents are delivered by feeder 5 to station 10. The documents may overlap each other exactly, or an inner document can overlap the outer document as shown in Fig. 2, or the outer document overlaps the inner document, as in Fig. 3.

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Double Document Separator

Multiple fed overlapping documents are separated, whereby one document is allowed to continue along a normal feed path to a work station and the other document is shunted to a document stacker. In Fig. 1, documents, including letters or other pieces of mail, normally enter de-doubling station 10, one at a time, in seriatim, and pass therefrom through aligner station 15, to a work station, such as a read station, not shown. However, misfeeding can occur where two overlapping documents are delivered by feeder 5 to station
10. The documents may overlap each other exactly, or an inner document can overlap the outer document as shown in Fig. 2, or the outer document overlaps the inner document, as in Fig. 3.

Station 10 includes perforated belts, 21 and 22, which are trained so that belts 21 and 22 define the normal and shunt document paths, respectively. Documents fed to station 10 are first transported by belt 22 with the vacuum in chamber 23 holding them to the belt. Then for a short distance, belt 21 takes over and the holding force is provided by vacuum chamber 24. After the documents pass chamber 24, they are transported between belts 21 and 22 in captured form until they reach corner 25. If a single document is being transported, it will turn corner 25 as the relatively high vacuum in chamber 26 holds the document to belt 21. The document then continues to be transported by belt 21 to aligner station 15. Overlapping vacuum chamber 27, which is at a lower vacuum than chamber 26, holds the document to belt 21 until the aligner station takes over.

The outer document of exactly overlapped inner and outer documents or of an inner document overlapping the outer document will not turn corner 25, due to centrifugal force and the lack of a vacuum force to hold it to belt 21. Instead, it separates from the...