System and method for detecting pen-to-paper spacing in a printing system
US7588302B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2006 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Jun 23, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/04556
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A system for detecting pen-to-paper spacing (PPS) in a printing system having a pen attached to a moveable print head positioned near a print media position, includes a test pattern, at the print media position, a sensor device, attached to the print head, and a controller. The test pattern includes printed lines having a line dimension, and the sensor device is positioned to shine light upon, and detect light reflected from the test pattern as the print head scans across the test pattern. The controller is connected to receive reflectance signals from the reflectance sensor, and configured to determine line dimensions in the test pattern and compare said line dimensions with predetermined line dimension values for the test pattern to determine variation in the PPS.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.