A sheet guide comprising a first straight portion in an upstream end of the sheet guide in a conveyance direction of a sheet, a curved portion having a curvature, the curved portion continued from the first straight portion in the conveyance direction, and a second straight portion continued from the curved portion in a downstream end of the sheet guide in the conveyance direction. The curved portion includes a pair of guide plates defining a conveyance path through which the sheet is guided, and a shape retention member retaining a part of the pair of guide plates in a curved shape, the shape retention member holding each end of the pair of guide plates in a direction orthogonal to the conveyance direction.

An automatic document feeder includes a media path to route media through an image read area for the automatic document feeder, and a media ramp supported along the media path after the image read area, with an end of the media ramp to rotate in a direction transverse to the media path.

An automatic document feeder includes a media path to route media through an image read area for the automatic document feeder, and a media ramp supported along the media path after the image read area, with an end of the media ramp to rotate in a direction transverse to the media path.

A medium-transport apparatus includes: an apparatus main body having the transport path for transporting the medium; and a cover CV provided on the side surface of the apparatus main body and configured to be switched between a first state of exposing the transport path and a second state of covering the transport path. The cover CV is divided into: a first cover that has the rotation shaft along a Z-axis and is rotatable with respect to the apparatus main body; and a second cover that is arranged on a −Z side of the first cover, has the rotation shaft along a Y-axis on the Z− side, and is rotatable with respect to the apparatus main body.

A medium-transport apparatus includes: an apparatus main body having the transport path for transporting the medium; and a cover CV provided on the side surface of the apparatus main body and configured to be switched between a first state of exposing the transport path and a second state of covering the transport path. The cover CV is divided into: a first cover that has the rotation shaft along a Z-axis and is rotatable with respect to the apparatus main body; and a second cover that is arranged on a −Z side of the first cover, has the rotation shaft along a Y-axis on the Z− side, and is rotatable with respect to the apparatus main body.

A pneumatic transmission device includes a transmitting channel, an air inlet and an air supply device. The transmitting channel includes a first feeding path, a second feeding path, and a compressing path communicated between the first feeding path and the second feeding path. The compressing path is gradually inclined downward and rearward from a front end of the compressing path to a rear end of the compressing path. The second feeding path is equipped with a scanning unit. The air inlet is slantwise extended upward and frontward from a top wall of the transmitting channel. An inside of the air inlet defines a passageway. The passageway is connected with the second feeding path. The air supply device is connected to the passageway. The air supply device injects high pressure air into the passageway.

A pneumatic transmission device includes a transmitting channel, an air inlet and an air supply device. The transmitting channel includes a first feeding path, a second feeding path, and a compressing path communicated between the first feeding path and the second feeding path. The compressing path is gradually inclined downward and rearward from a front end of the compressing path to a rear end of the compressing path. The second feeding path is equipped with a scanning unit. The air inlet is slantwise extended upward and frontward from a top wall of the transmitting channel. An inside of the air inlet defines a passageway. The passageway is connected with the second feeding path. The air supply device is connected to the passageway. The air supply device injects high pressure air into the passageway.

A transport device includes a transport roller, a nip section, and first and second transport path surfaces. The transport roller transports a transport target material sent from an accommodating unit. The nip section nips the transport target material with the transport roller, and prevents multi-feed of the transport target material. The first transport path surface is disposed upstream of the nip section in a transport direction to face a transport roller side of the nip section. The first transport path surface includes a top portion protruding toward the transport roller side beyond a nip line between the transport roller and the nip section. The second transport path surface is disposed downstream of the nip section in the transport direction to face the transport roller side of the nip section. The second transport path surface includes a top portion protruding toward the transport roller side beyond the nip line.

An image forming apparatus includes an image formation engine configured to form an image on a sheet, and a re-conveyer configured to convey the sheet having an image formed on one surface thereof by the image formation engine to the image formation engine again along a re-conveying path. The re-conveyer includes a conveying roller configured to convey the sheet in a re-conveying direction toward the image formation engine, a first guide member configured to be swingable between a first position at which the first guide member defines a portion of the re-conveying path upstream of the conveying roller in the re-conveying direction and guides the sheet to the conveying roller and a second position for exposing the potion of the re-conveying path, and a support member configured to swingably support the first guide member and rotatably support the conveying roller.

A conveyance device includes a conveyance path having a curved portion and a pair of conveyers which are disposed in the conveyance path and convey a medium while nipping it, wherein the medium enters the pair of conveyers in a state of being at least partially curved in the curved portion, and the conveyance path guides the medium toward one of the pair of conveyers.