Double feed sensing device, double feed determining method...

Details Double feed sensing device, double feed determining method... Double feed sensing device, double feed determining method...

2006-07-10

2010-10-19

Yan, Ren (Department: 2854)

Electrophotography

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C399S389000, C271S258010, C271S262000, C271S263000, C271S265010, C271S265020, C271S265040

Reexamination Certificate

active

07817957

ABSTRACT:
The invention provides a double feed sensing device capable of sensing double feed of paper sent out for the first time. The double feed sensing device includes a thickness sensing unit for sensing thickness of cut paper conveyed, a rigidity sensing unit for sensing bending rigidity of the conveyed paper, and a double feed determining unit for comparing a value of the thickness of the paper sensed by the thickness sensing unit and a value of the bending rigidity of the paper sensed by the rigidity sensing unit with threshold values of thickness and rigidity of the paper set based on values of thickness and bending rigidity of one sheet of the paper and values of thickness and bending rigidity of stacked sheets of the paper, so as to determine whether the paper is double-fed or not.

REFERENCES:
patent: 2005/0058480 (2005-03-01), Ohashi et al.
patent: 05014640 (1993-01-01), None
patent: 6-40604 (1994-02-01), None
patent: 11-116101 (1999-04-01), None
patent: 2004237699 (2004-08-01), None

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