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Double Document Detection Apparatus

IP.com Disclosure Number: IPCOM000095412D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Haney, DW: AUTHOR [+2]

Abstract

The occurrence of two superimposed documents moving along a transport path is detected. This is by applying opposing vacuum at opposite sides of the path to separate the documents.

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Double Document Detection Apparatus

The occurrence of two superimposed documents moving along a transport path is detected. This is by applying opposing vacuum at opposite sides of the path to separate the documents.

Documents 1 normally feed successively between roller 2 and oppositely rotating restraint belt 3 entering detection chamber 4. At chamber 4 they are drawn by a common vacuum. Such is applied to perforated chamber pairs 5, 5a and 6, 6a through duct 7, against either upper perforated belt pair 8 or lower perforated belt pair 9. Belt pairs 8 and 9 are rotated by respective pulleys 10 and 11 in the direction indicated about idler pulleys 12 and carry the documents to pressure rollers 13 and 14, to subsequently reach drum 15.

Positioned between each pair 5, 5a and 6, 6a is a light source 16, lens 17 and photocell 18. When a document is drawn against either of belt pairs 8 or 9, the document surface reflects light from the source adjacent the effective vacuum chambers to the photocell in it to produce an electrical output signal. A single document results in a single output signal.

Should superimposed documents inadvertently enter chamber 4, both pairs 5, 5a and 6, 6a are effective to attract a document. Thus, both photocells 18 are activated to provide a pair of output signals. The coincidences of output signals are coupled to operate an indicator or generate a control signal. Optical fibers 19 are used to insure that photocells 18 are effective only when...