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Document Transport Drum

IP.com Disclosure Number: IPCOM000087244D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Gill, LT: AUTHOR [+4]

Abstract

Conventional document transport devices usually require back up rollers or pads, are often severely tolerance limited, and, if documents varying in size over a large range are to be transported, are quite complex.

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Document Transport Drum

Conventional document transport devices usually require back up rollers or pads, are often severely tolerance limited, and, if documents varying in size over a large range are to be transported, are quite complex.

This device overcomes these problems. As shown, a document is driven along the path with small urethane fingers that are attached to a drum surface. The fingers protrude 1/2" out from the drum and extend through the wire racks used to guide the document. As the document is driven into the drum area, the fingers are deflected by the document surface and the document is pinched between the fingers and the wire rack. The drum is a driven member and the friction force between the fingers and the document provide the drive force for the document. The advantages offered with this type of transport mechanism are that the gap between the drum and the wire rack can vary plus or minus .050" and still feed documents reliably, and the mechanism can transport documents which vary in size over a large range. For instance, 13 to 24 documents, 8" to 14.33" long and 7" to 14.33" wide can be transported.

While documents can be driven with a single set of fingers, if two or more rows of fingers are used, more reliable transport results. That is, multiple rows of fingers offer multiple lines of driving forces which resist the tendency of the sheet to skew due to the uneven drag forces across the width of the document.

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