US 8,079,589 B2Granted

Sheet conveying apparatus and image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorsHiroyuki Kinoshita, Hideyuki Terashima, Naohiro Iwata, Kosuke Yamamoto, Akihiro Tomoda, Ryosuke Sato, Akio Okubo

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Abstract

A first conveying mechanism includes an intermediate conveying roller for conveying a recording sheet, an intermediate conveying roller shaft for supporting the intermediate conveying roller, an intermediate conveying roller drive mechanism for rotationally driving the intermediate conveying roller shaft, and a roller control mechanism for controlling movements of the intermediate conveying roller relative to the intermediate conveying roller shaft. The roller control mechanism performs skew correction along with conveying the recording sheet by rotating the intermediate conveying roller integrally with the intermediate conveying roller shaft while the intermediate conveying roller drive mechanism rotationally drives the intermediate conveying roller shaft and stops the rotational drive of the intermediate conveying roller shaft performed by the intermediate conveying roller drive mechanism after the skew correction to cause the intermediate conveying roller to be movable within a predetermined range in the axial direction of the intermediate conveying roller shaft.

Claims15

Dependent claims

A sheet conveying apparatus having:

a first conveying unit for conveying a sheet;
a second conveying unit which is disposed downstream in the conveying direction of the sheet conveyed by the first conveying unit to convey the sheet,
wherein the apparatus conveying the sheet and performing skew correction for correcting the orientation of the sheet with the front edge in the conveying direction of the sheet abutting against the second conveying unit so as to make the front edge of the sheet perpendicular to the conveying direction,
wherein the first conveying unit includes a conveying roller member for conveying the sheet, a conveying shaft for supporting the conveying roller member such that the conveying roller member is movable in the axial direction of the conveying shaft and the rotational direction relative to the shaft, a roller driving unit for rotationally driving the conveying shaft, and a limiting unit for limiting the axial movement of the conveying roller member and the rotational movement of the roller member, and
wherein the limiting unit limits the axial movement of the roller member to a first range in a state where the shaft rotates in the conveying direction to rotate the roller member, and limits the axial movement of the roller member to a second range larger than the first range in a state where the shaft is rotated by the roller that is rotated by the sheet conveyed by the second conveying roller.

2 more elements

A sheet conveying apparatus for correcting skew of a sheet by abutting the front edge of the sheet, which is conveyed by a first conveying roller, against a nip of a second conveying roller pair, wherein:

the first conveying roller includes a roller member which comes in contact with the sheet to apply a conveying force to the sheet and a shaft for supporting the roller member;
the roller member is movable in an axial direction of the shaft and in a rotational direction relative to the shaft;
and
a limiting unit for limiting the axial movement of the roller member and the rotational movement of the roller member wherein the limiting unit limits the axial movement of the roller member to a first range in a state where the shaft rotates in the conveying direction to rotate the roller member, and limits the axial movement of the roller member to a second range larger than the first range in a state where the shaft is rotated by the roller that is rotated by the sheet conveyed by the second conveying roller.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 12/465,977Filed 14 May 2009
Priority: JP 2008-13950128 May 2008
Published: US 2009/0295079 A13 Dec 2009
Granted: 20 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B65H 9/006
Deskewing sheet by abutting against a stop, i.e. producing a buckling of the sheet: the stop being formed by forwarding means in stand-by
B65H 2403/70
Power transmission; Driving means: clutches; Couplings
B65H 2404/1424
Arranged on movable frame: moving in parallel to their axis
B65H 2404/1531
Arrangements of rollers facing a transport surface: the transport surface being a cylinder