A plurality of moving-amount detecting units respectively detects a moving amount of the sheet fed by a feeding unit at a plurality of points in a width direction of the sheet. A skew detecting unit detects a skew of the sheet based on the moving amount of the sheet detected by the moving-amount detecting units.

Claims

11 · 2 independent · depth 3

11 granted claims

›1.independentA sheet feeding device comprising:na feeding unit configured to feed a sheet;a plurality of moving-amount detecting units for respectively detecting m…+9

›2.↳ 1The sheet feeding device according to claim 1, whereinneach of the moving-amount detecting units includes a disk-shaped rotational element configured …d2+1

›4.↳ 1The sheet feeding device according to claim 1, wherein at least one moving-amount detecting unit is arranged on each side of the sheet in the width di…d2

›5.↳ 1The sheet feeding device according to claim 1, wherein the moving-amount detecting units is configured to detect at least a moving amount of both side…d2

›6.↳ 1The sheet feeding device according to claim 1, wherein the skew detecting unit is configured to detect the cumulative skew of the sheet when the devia…d2

›7.↳ 1The sheet feeding device according to claim 1, further comprising:na stacking unit on which a plurality of sheets is stacked; anda separating unit con…d2

›8.↳ 1The sheet feeding device according to claim 1, wherein the moving-amount detecting units are arranged at a downstream side of the feeding unit in a fe…d2

›9.↳ 1The sheet feeding device according to claim 1, wherein the moving-amount detecting units are aligned in a direction perpendicular to a feeding directi…d2+1

›11.independentA skew detecting method comprising:ndetecting moving amounts of a sheet that is fed at a plurality of points in a width direction of the sheet;calcula…

Classifications

2 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B65H7/08

USPC · US Patent Classification

271/261

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Pendency

3.9 y

1,442 days filing → grant

Office actions

non-final + final

Responses

2 RCE

Examiner

Jeremy R Severson

art unit 3653 · TC 3600

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Citations: 17 back · 0 forward

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Priority chain

1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20080265497 A1	30 Oct 2008

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