Inline skew and lateral measurement of a sheet during printing
US8573592B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2009 |
| Grant date | Nov 5, 2013 |
| Priority date | — |
| Expiry date | Aug 10, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2801/15
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
According to aspects illustrated herein, there is provided a method and system for measuring and controlling an angular orientation of a printed sheet along a feed path of a print making device, the printed sheet being a sheet of paper with a paper edge moving along the feed path and an image printed thereon. The method includes the following steps. First, moving the printed sheet past at least one pair of optical sensors to determine a first skew of the paper edge with respect to a first fixed reference and a second skew of the image with respect to a second fixed reference. Then, combining the first skew and the second skew to determine the total skew between the paper edge and the image. Finally, correcting the total skew for subsequent sheets using the first skew and the second skew information. Similar steps can be taken to determine the lateral positioning errors which can then be corrected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.