It is desirable to improve alignment of sheets discharged to a stack tray without increasing the size and cost of the apparatus.

A stacking portion which is sloped so that a downstream side is higher than an upstream side in a sheet conveyance direction and on which a sheet discharged by a discharging portion is stacked and a plurality of rotation members which protrudes from an upper face of the stacking portion are provided. At least one of the plurality of rotation members rotates only in a direction opposite to the sheet conveyance direction.

A sheet feeder includes: a casing; a first roller; and a pressing portion. The casing defines therein a conveying region through which a sheet is conveyed in a conveying direction. The first roller has a rotation axis extending in an axial direction crossing the conveying direction and rotatable about the rotation axis. The first roller has a portion exposed to the conveying region. The pressing portion is movable in a direction crossing the conveying region between a first position and a second position. The pressing portion is urged toward the first roller to provide the first position. The pressing portion in the first position has a portion disposed within the conveying region and spaced apart from the first roller by a prescribed distance. The pressing portion in the second position is separated from the first roller farther than in the first position.

A sheet conveying device, which is included in an image forming apparatus and a post processing device, includes a position corrector and either one of a rolling body and a contact resistance reducer. The position corrector is configured to convey a sheet and correct a position of the sheet. The rolling body is disposed at least one of an upstream side and a downstream side of a sheet conveyance passage from the position corrector in a sheet conveying direction and is configured to roll in at least a direction intersecting the sheet conveying direction. The contact resistance reducer is configured to reduce contact resistance generated due to contact of the sheet to a neighboring part when the position of the sheet is corrected by the position corrector.

A sheet conveyance device includes a driving rotation device, a driven rotation device, and a supporting device including first and second restriction surfaces and supporting the driven rotation device. The driving rotation device rotates by receiving rotational driving force and drives the driven rotation device to rotate at a position facing the driving rotation device. The driven rotation device includes a driven rotation member contacting the driving rotation device, a cylindrical shaft having a cylindrical shape that rotatably supports the driven rotation member, and a restriction member that is at least partially inserted in an inner circumference side of the cylindrical shaft. A position of the cylindrical shaft is restricted in a width direction crossing the sheet conveyance direction by the restriction member contacting the first restriction surface, and movement of the cylindrical shaft in a rotational direction is restricted by the restriction member contacting the second restriction surface.

An image forming apparatus includes a main casing including an image forming unit and a discharge tray, and an optional device configured to be removably attached to the main casing. The main casing includes a conveying path through which a sheet is conveyed from the image forming unit, a discharge path through which the sheet is conveyed toward one of the discharge tray and the optional device, the discharge path diverging from the conveying path, and a return path including a first path through which the sheet is conveyed temporarily out of the main casing via an opening formed in the main casing, and a second path through which the sheet is conveyed toward the image forming unit. The first path diverges from the conveying path. The second path diverges from the first path. The optional device is disposed closer to the discharge tray than the opening.

A device for stacking flat items has stacking wheels which have stacking fingers and, located between the stacking fingers, compartments for receiving flat items to be stacked, a conveying device for conveying the flat items into the compartments of the stacking wheels, a stripper for removing the flat items from the compartments of the stacking wheels, a support for receiving the flat items removed from the compartments of the stacking wheels and for forming a stack of flat items, in which at least one first stacking wheel mounted on a first shaft and at least one second stacking wheel mounted on a second shaft are provided.

A sheet conveyance apparatus includes a receiving conveyance path branching into a first conveyance path and a second conveyance path. A guide member guides a sheet passing through the receiving conveyance path and is movable between a first position to guide the sheet toward the first conveyance path and a second position to guide the sheet toward the second conveyance path. A rotary member is disposed on the receiving conveyance path and configured to guide the sheet by rotating in contact with the sheet. The rotary member is configured to guide the sheet on the same side as the guide member that is on the first position, while guiding the sheet on the opposite side from the guide member that is on the second position. The sheet is conveyed in contact with both the rotary member and the guide member when the guide member is on the first position.

A discharge apparatus includes: a discharge mechanism including a discharge port and discharging a recording medium from the discharge port in a first direction; a receiving member having a receiving surface which receives the recording medium discharged from the discharge port; an abutting member having an abutting surface which abuts against an upstream end or a downstream end in the first direction of the recording medium received by the receiving surface; and guide members extending upward beyond the receiving surface and guiding the recording medium which is discharged from the discharge port to fall toward the receiving surface, from both sides in a second direction orthogonal to the first direction and parallel to the receiving surface. The guide members respectively include protruding portions protruding inward in the second direction and extending in a longitudinal direction of the guide members.

In one example in accordance with the present disclosure a media transport device is described. The device includes a number of drive rollers coupled to a frame. A number of media rollers are also coupled to the frame. The media rollers are in contact with, and rotated by, the number of drive rollers. Media rollers in a first set have a first diameter and media rollers in a second set have a second diameter that is different from the first diameter. The device also includes a number of pinch rollers coupled to the frame. The pinch rollers are in contact with the number of media rollers to form a number of nips through which media passes along a feed path.

A system includes an image forming station, which is configured to apply droplets of one or more printing fluids to a target substrate, so as to form an image thereon, and a substrate conveyor, which includes one or more perforated plates having multiple openings, and is configured to grip and move the target substrate to and from the image forming station for forming the image, the substrate conveyor includes one or more rotatable elements, which are fitted in the respective openings, and are configured to provide mechanical support to the target substrate, and when the target substrate moves over the one or more rotatable elements, at least one of the rotatable elements is configured to rotate in response to a physical contact with the target substrate.