Sheet feeder and image forming apparatus
US9024984B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2012 |
| Grant date | May 5, 2015 |
| Priority date | — |
| Expiry date | Dec 18, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2801/12
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The present invention provides a sheet feeder, including: a support member which can be rotated around a pivot at upstream side thereof in a sheet feeding direction and supports sheets; a driving unit rotating the support member upwardly; a feeding portion feeding the sheets; a first detection unit detecting the sheets on the support member at a first detection position above the support member; a second detection unit detecting the sheets on the support member at a second detection position located at upstream of the first detection position and below the first detection position; and a stacking amount determining portion determining a stacking amount of the sheets on the support member, based on a period of time between a time when the second detection unit detects the sheets and a time when the first detection unit detects the sheets while the support member is upwardly rotated by the driving unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.