Tracing apparatus with suction paper control means
US3943530A · kind A · utility
4Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1974 |
| Grant date | Mar 9, 1976 |
| Priority date | — |
| Expiry date | Aug 13, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D9/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a tracing apparatus operating automatically on the basis of digital imputs. A buffer-loop is formed in the paper band between each drive roll and the control drum, and the loops so formed are balanced by a loop corrector/reader device. In one prior art apparatus, this device includes photoelectric cells. The tracing apparatus is characterized in that it includes three suction chambers, one for each buffer-loop and a third central chamber beneath the control drum, whereby two saggings of the paper are obtained on either side of the control drum that are entirely independent of the two buffer-loops.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.