Sheet feeder and copying machine including the same

Details Sheet feeder and copying machine including the same Sheet feeder and copying machine including the same

2007-07-05

2010-10-26

Nguyen, Judy (Department: 2854)

Electrophotography

Document handling

Original

C399S018000, C399S388000

Reexamination Certificate

active

07822376

ABSTRACT:
A sheet feeder includes: a sheet-length detection member for detecting a length of a sheet; a transfer-length detection member for detecting a transfer length of the sheet; a double-feed detection member for detecting double feed of the sheets when the sheets are transferred while being overlapped with one another; and a control member for controlling the sheet-length detection member, the transfer-length detection member and the double-feed detection member; wherein the control member determines that double feed of the sheets has occurred, when the transfer length of the sheet is greater than the length of the sheet and a length obtained by subtracting a difference between the transfer length of the sheet and the length of the sheet from the length of the sheet is substantially equal to a double-feed length detected by the double-feed detection member.

REFERENCES:
patent: 4873547 (1989-10-01), Sasaki et al.
patent: 5131648 (1992-07-01), Ito
patent: 2005/0127597 (2005-06-01), Sano et al.
patent: 2005/0228535 (2005-10-01), Simonis et al.
patent: 09-142699 (1997-06-01), None

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