Friction retard sheet feeder
US7588245B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2005 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Aug 12, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H3/5261
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A retard feeder adapted to separate and advance media sheets comprising a media sheet advancing device including a drive roll and a retard roll. The drive roll and the retard roll include a feed nip therebetween for driving the media sheets at a velocity. A first drive system is provided to selectively drive the drive roll and the at least one nudger roll in a forward direction. A second drive system drives the retard roll through a slip clutch having a torque wherein the slip clutch torque allows the retard roll to rotate at substantially the same velocity as the drive roll when only one sheet is in the feed nip. The retard feeder further includes a motion sensor for detecting a signal when the retard roll stops rotating at the velocity of the drive roll corresponding to when more than one sheet is in the feed nip. The second drive system can selectively vary the velocity of the retard roll in response to the signal from the retard roll motion sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.