Variable force wide document belt transport system
US4440492A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 3, 1982 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Sep 3, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/64
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A document transport for transporting document sheets over a copier platen and into a registration position thereon for copying with a single light reflective, flexible, unapertured and air impervious wide frictional movable belt providing a uniform light imaging background for the document sheet, having a selectably actuatable vacuum system for selectably applying a vacuum to a vacuum plenum overlying the vacuum belt above the platen, for lifting all but selected minor areas of the belt away from the platen and document toward the vacuum plenum when a vacuum is applied, but and for allowing the belt to drop into planar engagement with a document sheet on the platen over a much larger area of said belt when the vacuum is removed, and belt deforming rollers deforming the selected minor areas of the belt away from the vacuum plenum towards the platen for selective area driving of a document sheet on the platen with these deformed minor areas or protuberances of the belt when the vacuum is applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.