Electronic sheet rotator with deskew, using single variable speed roller
US5090683A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1990 |
| Grant date | Feb 25, 1992 |
| Priority date | — |
| Expiry date | Jul 31, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2511/24
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A device for selectively turning documents includes first and second drive rollers aligned along an axis which is transverse to a process direction along which documents are fed, and first and second follower rollers cooperatively peripherally aligned with the first and second drive rollers, respectively. One of the drive rollers is operated at a substantially constant peripheral velocity by a first drive which is a constant velocity motor while the other drive roller is operated at a variable peripheral velocity by a variable speed drive so that the document is turned. Thus, only a single variable speed drive, such as, for example a stepper motor or servo system, is required. The variable speed drive is driven through a variable velocity profile to control the amount of rotation of the document. Preferably the document is turned approximately 90.degree.. By placing a pair of sensors adjacent the drive rollers, the skew of the document prior to being rotated can be measured and used to determine the velocity profile for controlling the variable speed motor. After the document is rotated, the same two sensors are used to detect the skew, if any, of the trailing edge of the turned do…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.