Browse Prior Art Database

Self Valving Document Feeding Apparatus

IP.com Disclosure Number: IPCOM000095654D
Original Publication Date: 1964-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Haney, D: AUTHOR [+2]

Abstract

Extremely thin, flexible documents can be fed reliably without buckling by using vacuum and belt feeding apparatus. In this, the vacuum is controlled by the position of the document to minimize the pushing effect on it.

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Self Valving Document Feeding Apparatus

Extremely thin, flexible documents can be fed reliably without buckling by using vacuum and belt feeding apparatus. In this, the vacuum is controlled by the position of the document to minimize the pushing effect on it.

A common vacuum source applies vacuum to ports 1 and 2 of manifolds 3 and 4. Across these, a perforated belt 5 is moved in the direction shown by driver pulley 6 and idlers 7. The top document from stack 8 is attracted against the belt by evacuated manifold 3 and moved by the belt toward manifold 4. As the leading edge of the document covers manifold 4, the vacuum in it increases so that atmospheric pressure causes vane 9 and its shaft 10 to rotate in a clockwise direction. Shaft 10 is rotatable in manifold housing 11 and has an arm 12 fixed to it which supports a shutter 13. Shutter 13 is biased upwardly by spring 14. Rotation of vane 9 moves shutter 13 downwardly to the position shown, blocking evacuation of manifold 3. This action releases the trailing portion of the document from belt 5. Thus, the document is drawn along its path without a pushing effect.

When the trailing edge of the document passes manifold 4, the vacuum in it decreases permitting spring 14 to move shutter 13 upwardly to again apply vacuum to manifold 3 and attract the next document in the stack. Restraint belt 15 is driven on pulleys 16 in a direction opposite to belt 5 to prevent the feeding of two documents simultaneously.

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