Scanning unit with independent spring-loaded document control co

Details Scanning unit with independent spring-loaded document control co Scanning unit with independent spring-loaded document control co

1994-10-17

1996-08-20

Skaggs, H. Grant

Sheet feeding or delivering

Feeding and delivering

Conveyor releases to subsequent conveyor

271 41, 271 1011, 271274, B65H 500

Patent

active

055471790

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.

REFERENCES:
patent: 3430947 (1969-03-01), Davis
patent: 4508444 (1985-04-01), May et al.

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