Double sheet feed detector and method

Details Double sheet feed detector and method Double sheet feed detector and method

2011-04-19

2011-04-19

Bollinger, David H (Department: 3653)

Sheet feeding or delivering

Feeding

With means to interrupt feeding

Reexamination Certificate

active

07926807

ABSTRACT:
A feeder head includes suction belts to sequentially feed top sheets from a stack of sheets (e.g., paper). Before the belts receive suction and drive power, a suction cup raises the top sheet at a location between the belts to produce a corrugated shape in the top sheet which induce separation of a second sheet that might be adhered to the top sheet. A double sheet detector includes a pair of rollers forming a nip through which a fed sheet passes, causing the rollers to separate. The amount of separation is transmitted to a transducer which generates a signal proportional to the sheet thickness. Signals from the transducer are frequently sensed and averaged, so that signal variations resulting from irregularities in the shape of the rollers are canceled out.

REFERENCES:
patent: 4420747 (1983-12-01), Kistner
patent: 5988634 (1999-11-01), Elrick et al.
patent: 6634598 (2003-10-01), Susko
patent: 6672587 (2004-01-01), Mohringer et al.
patent: 6955348 (2005-10-01), Koga
patent: 7125014 (2006-10-01), Dolz et al.
patent: 7207558 (2007-04-01), Edinger

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