Tracking system
US4331274A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1980 |
| Grant date | May 25, 1982 |
| Priority date | — |
| Expiry date | Oct 14, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H23/038
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An elongated sheet transport and guidance system including a drive roller mounted for rotation on a frame and adapted to engage and frictionally drive the sheet along its longitudinal axis and a pinch roller engaging the drive roller and mounted for rotation on an axis parallel thereto, the pinch and drive rollers being arranged to straddle and exert a pressure on that portion of the sheet passing therebetween. Also included in the system is a first means for inducing a first pressure level between the pinch and drive rollers in a region adjacent one longitudinal edge of the traveling sheet and a second means for inducing a second pressure level between the pinch and drive rollers in a region adjacent the opposite longitudinal edge of the sheet. In response to the output of a sensing means that senses lateral displacement of the traveling sheet, a control mechanism varies the difference between the first and second pressure levels. The control mechanism causes the first pressure level to increase relative to the second pressure level in response to lateral displacement of the sheet in one sense and causes the second pressure level to increase relative to the first pressure level in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.