Sheet feeder for feeding recording sheets while separating these
US7334788B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2004 |
| Grant date | Feb 26, 2008 |
| Priority date | — |
| Expiry date | Sep 14, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2515/34
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A sheet feeder is provided, which includes: a sheet feed member and a separating member which form a nip portion by pressing each other, the separating member rotates following the sheet feed member when a first recording sheet is inserted into the nip portion, and rotates reversely when a second recording sheet is inserted while being stacked under the first recording sheet; a sheet detection unit which detects the recording sheet inserted into the nip portion; a direction detection unit which detects a rotation direction of the separating member; and a separating force adjusting unit which gradually increases a reverse rotation torque of the separating member from a initial torque after the sheet detection unit detects the recording sheet, and stops the increase of the reverse rotation torque to maintain the reverse rotation torque when the direction detection unit detects reverse rotation of the separating member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.