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Browse Prior Art Database

Vacuum Belt Transport

IP.com Disclosure Number: IPCOM000048310D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Beran, MA: AUTHOR [+3]

Abstract

The above drawing shows a cross-section of an improved vacuum transport belt suitable for transporting a document relative to the document platen of a convenience copier. The system includes a vacuum manifold with a supply plenum therein. A plurality of supply orifices interconnect the supply plenum to a plurality of vacuum pools. The vacuum belt rides on the vacuum pools, and vacuum to the surface of the belt is supplied through a plurality of vacuum holes in the belt. When the pool area is covered by a document, the pool pressure 10 is equal to the supply pressure 12, and when the pool area is exposed, pool pressure 10 is approximately equal to atmospheric pressure.

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Vacuum Belt Transport

The above drawing shows a cross-section of an improved vacuum transport belt suitable for transporting a document relative to the document platen of a convenience copier. The system includes a vacuum manifold with a supply plenum therein. A plurality of supply orifices interconnect the supply plenum to a plurality of vacuum pools. The vacuum belt rides on the vacuum pools, and vacuum to the surface of the belt is supplied through a plurality of vacuum holes in the belt. When the pool area is covered by a document, the pool pressure 10 is equal to the supply pressure 12, and when the pool area is exposed, pool pressure 10 is approximately equal to atmospheric pressure. Flow through the supply orifices approaches zero if the pool is covered by a document, and is governed by the supply orifice diameter and supply pressure if the pool is exposed.

As such, the airflow and vacuum level 12 do not change significantly with or without a document attaching to the vacuum belt. Therefore, less torque is required to accelerate the vacuum belt after exposure.

Furthermore, the cyclic drive torque variation is reduced, since the flow variation is diminished.

Additionally, when the vacuum belt transport is used to accurately position a document relative to the document platen of the copier, there should be no slippage between the document and the vacuum transport belt. To accomplish the no-slip condition, the above-described vacuum belt is coated with a high...