An image forming apparatus includes an image forming portion, a first conveyance path, a second conveyance path, a curved conveyance path, a first roller pair, a second roller pair disposed along the curved conveyance path, an inner guide, and an outer guide opposing the inner guide, constituting at least part of the curved conveyance path between the first roller pair and the second roller pair together with the inner guide, and provided on an outer side in a curving direction of the curved conveyance path. A nip line of the first roller pair and a nip line of the second roller pair intersect with each other. The outer guide is movable between a first position and a second position that is farther away from the inner guide than the first position.

An image forming apparatus includes an image forming portion, a first conveyance path, a second conveyance path, a curved conveyance path, a first roller pair, a second roller pair disposed along the curved conveyance path, an inner guide, and an outer guide opposing the inner guide, constituting at least part of the curved conveyance path between the first roller pair and the second roller pair together with the inner guide, and provided on an outer side in a curving direction of the curved conveyance path. A nip line of the first roller pair and a nip line of the second roller pair intersect with each other. The outer guide is movable between a first position and a second position that is farther away from the inner guide than the first position.

A medium conveying apparatus includes a conveying roller to convey a medium, a first unit, a second unit located to face the first unit, an imaging sensor provided in the first unit, to image the medium conveyed by the conveying roller, a reference member including a facing surface, and provided in the second unit in such a way that the facing surface is rotatable between a facing position at which the facing surface faces the imaging sensor, and a non-facing position at which the facing surface deviates from the facing position, a guide portion to slidably guide the second unit in a direction perpendicular to a medium conveying surface so that the second unit moves in the direction perpendicular to the medium conveying surface, and a support portion to rotatably support the reference member. The support portion is located inside the guide portion.

A medium conveying apparatus includes a conveying roller to convey a medium, a first unit, a second unit located to face the first unit, an imaging sensor provided in the first unit, to image the medium conveyed by the conveying roller, a reference member including a facing surface, and provided in the second unit in such a way that the facing surface is rotatable between a facing position at which the facing surface faces the imaging sensor, and a non-facing position at which the facing surface deviates from the facing position, a guide portion to slidably guide the second unit in a direction perpendicular to a medium conveying surface so that the second unit moves in the direction perpendicular to the medium conveying surface, and a support portion to rotatably support the reference member. The support portion is located inside the guide portion.

An image forming apparatus comprising includes an image carrying member including a movable surface to include a toner image; a transfer roller to form a transfer nip between the transfer roller and the movable surface of the image carrying member, to move position in a direction in correspondence to a thickness of a print medium to intersect a direction of introduction of the print medium into the transfer nip, and to receive a transfer bias voltage to transfer the toner image from the movable surface of the image carrying member to the print medium; and a movement guide structure to guide the print medium toward the transfer nip, and to move in synchronization with the movement of the position of the transfer roller to change a gap between an end of the movement guide structure facing the image carrying member and the image carrying member.

An image forming apparatus comprising includes an image carrying member including a movable surface to include a toner image; a transfer roller to form a transfer nip between the transfer roller and the movable surface of the image carrying member, to move position in a direction in correspondence to a thickness of a print medium to intersect a direction of introduction of the print medium into the transfer nip, and to receive a transfer bias voltage to transfer the toner image from the movable surface of the image carrying member to the print medium; and a movement guide structure to guide the print medium toward the transfer nip, and to move in synchronization with the movement of the position of the transfer roller to change a gap between an end of the movement guide structure facing the image carrying member and the image carrying member.

A turnable sheet stopper blocks and passes a sheet conveyed on a sheet guide, and includes a proximal portion, a distal portion connected to the end of the proximal portion, and a folding mechanism that connects the distal portion to the proximal portion. The sheet stopper transitions between first and second positions. In the second position, the proximal and distal portions integrally turn to the downstream side in the sheet conveyance direction to allow the sheet to pass. The sheet stopper transitions from the second position to a third position when a user draws out the sheet from an upstream side. In the third position, the distal portion folds toward the upstream side to allow the sheet to be drawn out. During transition from the second position to the third position, the edge of the distal portion is located on or away from an outer surface of the sheet guide.

A sheet conveyance apparatus includes a first conveyance portion configured to convey a sheet, a second conveyance portion configured to convey the sheet, the second conveyance portion including an abutment portion configured to form a loop on the sheet by being abutted against a leading edge of a sheet conveyed by the first conveyance portion, a curved guide portion, which is curved, configured to guide the sheet conveyed by the first conveyance portion to the second conveyance portion, and a rotary member arranged downstream of the first conveyance portion and upstream of the second conveyance portion in a sheet conveyance direction, and configured to be driven to rotate by a surface of the sheet that is guided by the curved guide portion, the surface sliding against the curved guide portion.

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 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.