A medium transport apparatus includes a first roller configured to apply feeding force to a medium in a medium transport path for transporting the medium, a second roller disposed on an upstream side of the first roller in a medium transport direction in the medium transport path, the second roller being configured to apply feeding force to the medium, a third roller configured to be switched between a first position at which the medium is to be nipped with the second roller and a second position at which the nipping of the medium is to be released, a switching section configured to switch a position of the third roller, and at least one protruding member protruding from an outer circumferential surface of the second roller, the protruding member being configured to separate the medium from the outer circumferential surface of the second roller in the medium transport path.

A sheet conveyance apparatus includes a conveyance roller, a first rotary member forming a first nip portion conveying a sheet in a first conveyance direction, a rotation axis of the first rotary member being inclined with respect to a rotation axis of the conveyance roller such that a center of one end of the first rotary member is positioned at a different position in the first conveyance direction with respect to a center of the other end, and a second rotary member forming a second nip portion conveying a sheet in a second conveyance direction, a rotation axis of the second rotary member being inclined with respect to the rotation axis of the conveyance roller such that a center of one end of the second rotary member is positioned at a different position in the second conveyance direction with respect to a center of the other end.

A cutting head-including printer includes at least one driving roller, a pair of side pinch rollers, a center pinch roller provided between the pair of side pinch rollers, and a roller moving mechanism that causes the center pinch roller to approach, or to be separated from, the at least one driving roller. The cutting head-including printer sets whether to perform cutting after printing or to perform the printing after the cutting. During the cutting performed after the printing, the cutting head-including printer separates the center pinch roller from the at least one driving roller. During the cutting performed before the printing, the cutting head-including printer locates the center pinch roller at a position where the center pinch roller holds a recording medium together with the at least one driving roller.

A sheet conveyance apparatus conveying a sheet includes a conveyance roller and first and second rotary members. A first virtual line and a second virtual line cross each other when viewed in the rotation axis direction of the conveyance roller, with the first virtual line passing through the rotation center of a first longitudinal end of the first rotary member and a rotation center of a second longitudinal end of the first rotary member when viewed in the rotation axis direction of the conveyance roller. A second virtual line passes through the rotation center of a third longitudinal end of the second rotary member and the rotation center of a fourth longitudinal end of the second rotary member when viewed in the rotation axis direction of the conveyance roller.

The present disclosure provides a double-sided printing paper conveying unit, including a paper conveyor configured to convey paper in a conveying direction, a guiding part configured to guide the paper conveyed by the paper conveyor, an aligner movably mounted on the guiding part, and configured to correct a skew posture of the paper during conveyance in an alignment direction perpendicular to the conveying direction; and a movement mechanism mounted on the guiding part and capable of moving the aligner along the alignment direction and between a first position corresponding to a first size of paper and a second position corresponding to a second size of paper such that the aligner aligns the paper based on a size of the paper. In addition, the present disclosure also provides an imaging apparatus that includes the double-sided printing paper conveying unit.

A web printing system has a loading tool to aid in the loading of new wide format web media. The loading tool is pivotable between a first position for loading a leading edge portion of the web onto the loading tool and a second position wherein an end portion of the loading tool extends above a print surface when in use. The end portion of the loading tool includes a beam element protruding from the loading tool in its pivoting direction towards the print surface, wherein in the second position the beam element is positioned with respect to the turn element, such that an S-shaped curve is formed in a web held on the loading tool. The curvature in the web significantly enhances the friction exerted by the beam element on the web, thereby stably holding the web in place.

A sheet transport device includes: a first transport roller that transports a sheet and that has two first nip parts, which are spaced apart in a sheet width direction and nip portions of the sheet; a second transport roller that transports the sheet, that is disposed upstream of the first transport roller in a sheet transport direction, that has a second nip part, which nips a portion of the sheet at a position different from at least one of the first nip parts in the width direction, and that stops exerting a force that transports the sheet when the sheet has been transferred to the first transport roller; and two tension-applying parts that are provided on the first transport roller, on the outer side of the two first nip parts in the width direction, and that apply, to the sheet, tension pulling the sheet outward in the width direction.

There is provided a roller including: a shaft, and an elastic body portion that is provided on an outer peripheral surface of the shaft, in which the elastic body portion includes a plurality of first recessed portions which are provided on one side of the roller in a shaft mounting direction at intervals in a circumferential direction of the roller and each have a bottom portion, and a plurality of second recessed portions which are provided on the other side of the roller in the shaft mounting direction at intervals in the circumferential direction of the roller and each have a bottom portion, and in which each of the first recessed portions is positioned between the adjacent second recessed portions in the circumferential direction of the roller in the side view of the roller in the shaft mounting direction.

A web printing system has a loading tool to aid in the loading of new wide format web media. The loading tool is pivotable between a first position for loading a leading edge portion of the web onto the loading tool and a second position wherein an end portion of the loading tool extends above a print surface when in use. The end portion of the loading tool includes a beam element protruding from the loading tool in its pivoting direction towards the print surface, wherein in the second position the beam element is positioned with respect to the turn element, such that an S-shaped curve is formed in a web held on the loading tool. The curvature in the web significantly enhances the friction exerted by the beam element on the web, thereby stably holding the web in place.

A sheet conveyance device, an image forming apparatus, and a sheet conveying method that convey a sheet in a predetermined sheet conveyance direction make a surface moving speed of a driven roller higher than a surface moving speed of a drive roller when a rotational driving force from the drive roller is transmitted to the driven roller, and by a one-way clutch that is provided at any place in a drive transmission path from the drive roller to the driven roller, restrict relative rotation of the driven roller in a first rotation direction, which is the sheet conveyance direction, with respect to the drive roller while allowing relative rotation of the driven roller in a second rotation direction, which is a direction opposite to the first rotation direction, with respect to the drive roller.