Vacuum holder for sheet materials
US5414491A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1994 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | Feb 14, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0422
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sheet material holder includes a vacuum platen defining a plurality of arrays of vacuum channels corresponding in number and size to a plurality of sheet material sizes on one surface thereof and including a corresponding plurality of distinct vacuum plenums communicating with the arrays of vacuum channels; a vacuum pump; a corresponding plurality of remotely actuatable valves connected between the vacuum plenums and the vacuum pump; a corresponding plurality of flow sensors for sensing the flow of air between the plenums and the vacuum pump; and logic and control means connected to the flow sensors and the valves for sensing air flow between a plenum and the vacuum pump and actuating the corresponding valve. Sheet size is automatically inferred by the pattern of valves that are actuated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.