A medium transport device includes a medium guide member, a driving source, a first movement member, a movement restricting member, and a second moving member. The medium guide member is movable between a first guide position, in which the medium guide member guides a medium toward a receiving member on which the medium is loaded, and a second guide position, in which the medium guide member guides the medium from the receiving member into the device. The driving source moves the medium guide member. The first movement member moves the medium guide member in accordance with an operation of the driving source. The movement restricting member is movable together with the medium guide member. The second moving member is movable between a first position, in which the second moving member is located close to the movement restricting member to restrict the medium guide member from moving from the second guide position to the first guide position, and a second position, in which the second moving member is spaced apart from the movement restricting member to allow the medium guide member to move to the first guide position. The second moving member moves from the first position to the second position when the medium guide member moves toward the first guide position in response to an operation of the driving source.

In order to miniaturize an image forming system, the present invention provides an image forming system which is provided with a sheet feed apparatus including a transport roller pair capable of transporting a sheet in a sheet transport direction S, and an image forming apparatus including an image forming section capable of forming an image on the sheet acquired from the sheet feed apparatus, including a switch member disposed on the downstream side of the transport roller pair in the sheet transport direction to be switched between a first position for guiding the sheet transported by the transport roller pair to the image forming apparatus, and a second position for guiding the sheet transported by the transport roller pair downward, and a storage tray disposed below the switch member predetermined space apart to be able to store the sheet guided to below the switch member positioned in the second position.

A conveyor includes: a receiver that detachably receives a roll-like sheet; a conveyance unit that conveys the sheet in a conveyance orientation along a conveyance surface; and a tensioner that applies tension to the sheet at a position upstream of the conveyance unit in the conveyance orientation. The tensioner includes: a frame having a groove pair extending in a first direction along the conveyance orientation; a guide having a curved surface that contacts the sheet and an engagement member pair that engages with the groove pair; a pivoting member that pivots around an axis extending in a second direction orthogonal to the first direction and parallel to the conveyance surface; a transmission member that transmits pivoting of the pivoting member to the guide; and an urging member that applies urging force including a component in the first direction to the guide.

A recording medium conveyance device includes a conveyance device cover, a pair of guides, a maintenance part, a removable cover. The conveyance device cover is openable and covers a conveyance passage of a recording medium. The pair of guides forms the conveyance passage and includes a cover side guide on the conveyance device cover and a body side guide separable from the cover side guide. The maintenance part is on at least one of the pair of guides. The removable cover is configured to form a part of the conveyance passage and cover the maintenance part.

A transfer unit includes: a transfer body that forms a transfer nip together with an image holding member provided to hold a developer image and allows a recording medium to be nipped in and transported through the transfer nip so that a developer image is transferred to the recording medium; and a guide member that intersects a tangent to the transfer nip and has a tip end portion located closer to the image holding member across the tangent when viewed in an axial direction, and guides the recording medium transported from an upstream side to the transfer nip, wherein the tip end portion has plural regions having different distances from the image holding member.

An image forming apparatus includes an image forming engine, a re-conveyance path configured to guide a sheet, on which an image is formed by the image forming engine, to be switched back and re-conveyed toward the image forming engine, a discharge tray, a discharge path configured to guide the sheet in a sheet discharge direction toward the discharge tray, a stack lever configured to contact a top surface of the sheet on the discharge tray and press the sheet toward the discharge tray, and a guide member configured to form a part of the re-conveyance path, extend up to a position downstream of the stack lever in the sheet discharge direction above the stack lever, and guide the sheet being conveyed along the re-conveyance path, between the guide member and the stack lever.

A sheet conveyance apparatus includes a first guide provided in an apparatus body, a second guide provided in an openable portion, a flag member supported by the apparatus body pivotally, a detection unit configured to detect pivoting of the flag member, and a jam release guide provided in the apparatus body. In a state where the openable portion is open, the flag member is protruded into a space that is created between the openable portion and the apparatus body by an opening operation of the openable portion. The jam release guide is disposed at a position not hampering conveyance of the sheet in a state where the openable portion is closed, and is disposed to come in contact, together with the flag member, with a jammed sheet to regulate a posture of the jammed sheet in a state where the openable portion is open.

A sheet conveying apparatus includes a paper re-feeding path, a switching member, a reversing roller, a paper discharge roller, a motor, and a revolution control mechanism. The switching member can be switched between a first position and a second position. The reversing roller can reverse a revolving direction thereof between a first revolving direction and a second revolving direction. The paper discharge roller revolves in a third revolving direction for conveying the sheet in a third conveying direction. The motor reverses the revolving direction of the reversing roller and switches the position of switching member by reversing the revolving direction thereof. The revolution control mechanism revolves the paper discharge roller in the third revolving direction with the revolution of the motor, regardless of the reversing of the revolving direction of the motor.

A media path includes a first media path portion, and a second media path portion opposed to the first media path portion, where the first media path portion and the second media path portion form the media path therebetween, and where, to open the media path, the first media path portion is rotatable relative to the second media path portion and the second media path portion is rotatable relative to the first media path portion.

A switching device for switching transport directions of a recording medium includes a switching member and at least one rotation stopper. The switching member is configured to switch transport paths of the recording medium. The at least one rotation stopper is configured to hit the switching member to stop rotation of the switching member. The at least one rotation stopper is disposed asymmetrically in a direction perpendicular to a transport direction in which the switching member transports the recording medium.