Large media proportional copying system
US4961090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1989 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Aug 3, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00569
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A copying system with a large document feeder for making large copy sheet (or web) media copies by moving the document past an optical scanning slit at a preset speed proportional to the speed of the imaging surface, and transferring the image onto a selected large copy media, with an easily correctable image size. The disclosed system provides for accurately controlling and adjusting the size of the copy image relative to the document image, by controlled adjustment of the magnification or reduction without requiring anamorphic or other lens changes. It is accomplished by making a test copy of the document onto the selected large copy media in the copier; measuring the dimensional change in the image on that copy media relative to the document image, in the direction of movement; deriving a simple numerical correction factor corresponding to the measured dimensional change; entering the correction factor into a variable speed control for the large document feeder to reset the speed of movement of the document past the optical scanning slit by an amount proportional to the correction factor, to provide a corresponding image reduction or magnification dimensional change of the copy …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.