Method and apparatus for detecting media level in a cassette
US6485013B2 · kind B2 · utility
3Cited by
15References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2000 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Dec 4, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2513/50
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
This invention relates to a method and apparatus for determining media level in a cassette. A single, fixed media level sensor is located adjacent to where the media is fed from the cassette. The bottom of the cassette is moved up until the top piece of media triggers the fixed sensor. The number of steps of the stepper motor (or the time an analog motor is on) indicates the distance the bottom of the cassette must be raised before the top of the media stack hits the sensor. The number of steps is used directly to determine the height of the stack of media and, therefore, the level of media in the cassette.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.