Lead edge sheet curl sensor
US7545519B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2006 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Jan 25, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0158
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A lead edge sheet curl sensor apparatus and method are disclosed. In general, a first and a second light emitter are aligned wherein the light beams from the first light emitter and second light emitter cross. The first and second light emitter beams cross at the transport media sheet substrate path wherein the transport media sheet substrate path is the path of a media sheet substrate with zero curl. First and second light detectors are aligned to receive the light beams from the first and second light emitters. A media sheet substrate with either positive or negative curl on the lead edge of the sheet substrate interrupts light beams from first and second light emitters, as detected at first and second light detectors. The time delay between the light beam interruptions is proportional to the sheet substrate curl, and the order of interruptions indicates whether the sheet substrate curl is positive or negative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.