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Browse Prior Art Database

Vacuum Belt Document Dedoubler

IP.com Disclosure Number: IPCOM000083293D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Brende, AP: AUTHOR [+4]

Abstract

In feeding documents such as mail pieces sequentially from a stack, adjacent documents frequently adhere to each other, creating a "double feed". Dedoubler 10, a top view of which is shown in Fig. 1, separates the documents in double feeds, allowing only one at a time to pass to a scanner transport or other device.

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Vacuum Belt Document Dedoubler

In feeding documents such as mail pieces sequentially from a stack, adjacent documents frequently adhere to each other, creating a "double feed". Dedoubler 10, a top view of which is shown in Fig. 1, separates the documents in double feeds, allowing only one at a time to pass to a scanner transport or other device.

When one or more documents in a feed approach dedoubler 10 from direction 11, conventional cylindrical static eliminators 12 first remove electrostatic charges therefrom. A pair of ported vacuum belts 13 and 14 converge to form a throat 15, and then separate at a first diverge corner 16.

For a single feed, the document adheres to belt 14. For a double feed in which the document nearest belt 11 leads the second document, both documents adhere to belt 14. But, when the document adjacent belt 13 trails the second document, the second document adheres to belt 13, since the vacuum from belt 14 is now masked by the first document. Sensor 17 detects the presence of the second document on belt 13, and activates a purge selector 30 when the documents pass sensor 31, after a fixed time delay which allows a previous feed to pass.

Belt 13 and ported vacuum belt 18 define a second throat 19 and a second diverge corner 20. A single document, entering throat 19 from belt 14, travels up belt 18 and is transferred to belt 13 at corner 20. But, for a double feed having the document nearest belt 13 leading the second document, the masking of the vacuum from belt 13 allows the second document to adhere to vacuum belt 18. Sensor 21 detects this second...