Scanning unit with independent spring-loaded document control components mounted on an integrated chassis
US5547179A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1994 |
| Grant date | Aug 20, 1996 |
| Priority date | — |
| Expiry date | Oct 17, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J13/103
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a scanning unit such as a facsimile machine, an automatic document feeder transports individual sheets from a stack of documents along a document path over a scanning window to an output tray. An upper guide member includes an integrated rigid chassis for positioning document control components adjacent the scanning window. The document control components included a central pre-scanning pinch roller, a full width hold-down limiter, and a central post-scanning pinch roller which are each mounted with their own separate biasing springs on the integrated chassis. Two elongated wire springs respectively engage both ends of the hold-down limiter, while two sets of cantilever leaf springs provide strong and weak spring biasing, respectively, to the pre-scanning and post-scanning pinch rollers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.