A sheet conveying device includes a tray, a conveyor, and a guide body. The tray is configured to stack a sheet. The conveyor is configured to convey the sheet to the tray. The guide body has a space, a height of the space being greater than a thickness of the sheet. The guide body is configured to guide the sheet conveyed by the conveyor, with a leading end of the sheet being inserted in the space. The guide body is configured to separate the sheet from the space, according to a difference of a sheet conveying speed of the conveyor and a moving speed of the guide body, and to stack the sheet on the tray.

A sheet stacker includes a tray to store a stack of sheets, a conveyor above the tray, a leading end guide above the tray, and an air exhaust. The conveyor conveys a sheet in a conveyance direction. The leading end guide is downstream from the conveyor in the conveyance direction. The leading end guide guides the sheet from the conveyor to the tray. The air exhaust exhausts air above an upper surface of the stack of sheets on the tray to an upstream from the tray in the conveyance direction. Further, the leading end guide holds a leading end of the sheet conveyed by the conveyor at a holding position and releases the leading end of the sheet at a release position downstream from the holding position in the conveyance direction.

A medium discharging apparatus includes a first tray in which a medium is received and placed, a second tray in which the medium discharged from the first tray is received, a discharging mechanism, a curl suppressing member, a link mechanism, a movement mechanism and a cam mechanism. The discharging mechanism discharges the medium from the first tray toward the second tray. The curl suppressing member suppresses curling of the medium discharged from the first tray to the second tray by the discharging mechanism. The curl suppressing member is provided in the link mechanism. The movement mechanism is configured to move the link mechanism and the curl suppressing member in both the discharge direction and a return direction opposite to the discharge direction. The cam mechanism guides movement of the link mechanism.

A medium discharging apparatus includes a first tray in which a medium is received and placed, a second tray in which the medium discharged from the first tray is received, a discharging mechanism, a curl suppressing member, a link mechanism, a movement mechanism and a cam mechanism. The discharging mechanism discharges the medium from the first tray toward the second tray. The curl suppressing member suppresses curling of the medium discharged from the first tray to the second tray by the discharging mechanism. The curl suppressing member is provided in the link mechanism. The movement mechanism is configured to move the link mechanism and the curl suppressing member in both the discharge direction and a return direction opposite to the discharge direction. The cam mechanism guides movement of the link mechanism.

An image forming system includes: an image forming apparatus configured to form an image on a recording medium; a post-processing apparatus configured to perform post-processing on the recording medium on which an image is formed by the image forming apparatus; a relay apparatus having a function of changing a transport speed of the recording medium on which an image is formed by the image forming apparatus to a transport speed of the post-processing apparatus and transporting the recording medium to a subsequent stage; and a charge eliminating apparatus configured to perform charge elimination on the recording medium that is charged, by reducing a charge amount of the charged recording medium, and the charge eliminating apparatus is provided at a stage that is after the relay apparatus and before the post-processing apparatus.

An image forming system includes: an image forming apparatus configured to form an image on a recording medium; a post-processing apparatus configured to perform post-processing on the recording medium on which an image is formed by the image forming apparatus; a relay apparatus having a function of changing a transport speed of the recording medium on which an image is formed by the image forming apparatus to a transport speed of the post-processing apparatus and transporting the recording medium to a subsequent stage; and a charge eliminating apparatus configured to perform charge elimination on the recording medium that is charged, by reducing a charge amount of the charged recording medium, and the charge eliminating apparatus is provided at a stage that is after the relay apparatus and before the post-processing apparatus.

An image reading apparatus, includes: a supply tray; a discharge tray; a conveyance guide; a reading sensor; a discharge unit, which includes a discharge opening to discharge the sheet conveyed by the conveyance guide to the discharge tray and is configured to move from a third position to a fourth as the document supported by the paper feed tray is decreased, the fourth position being higher than the third position; a first drive source, which generates a drive force; a first rotation body, which moves the movable plate by transmitting the drive force from the first drive source to the movable plate; and a second rotation body, which moves the discharge unit by transmitting the drive force from the first drive source to the discharge unit, wherein a diameter of the first rotation body and a diameter of the second rotation body are different from each other.

An image reading apparatus, includes: a supply tray; a discharge tray; a conveyance guide; a reading sensor; a discharge unit, which includes a discharge opening to discharge the sheet conveyed by the conveyance guide to the discharge tray and is configured to move from a third position to a fourth as the document supported by the paper feed tray is decreased, the fourth position being higher than the third position; a first drive source, which generates a drive force; a first rotation body, which moves the movable plate by transmitting the drive force from the first drive source to the movable plate; and a second rotation body, which moves the discharge unit by transmitting the drive force from the first drive source to the discharge unit, wherein a diameter of the first rotation body and a diameter of the second rotation body are different from each other.

A printing device includes: a casing; a first accommodating unit accommodating therein a printing medium; an image recording unit; a cutting unit; a supporting unit; a second accommodating unit; a first conveying passage; and a second conveying passage branching from the first conveying passage. The image recording unit is configured to record an image on the printing medium. The cutting unit is configured to divide the printing medium into a first medium and a second medium. The supporting unit is configured to support the printing medium conveyed in a first direction. The printing medium accommodated in the first accommodating unit is conveyed to the supporting unit along the first conveying passage. The second accommodating unit is positioned upstream of the image recording unit in the first direction and configured to accommodate therein the second medium. The second medium is conveyed to the second accommodating unit along the second conveying passage.

A sheet processing apparatus for processing sheets includes: a stack tray on which a sheet is stacked; a discharge roller pair composed of first and second rollers and configured to discharge a sheet onto the stack tray, the second roller being configured to be movable between a pressure contact position to contact with the first roller and a retracting position to separate from the first roller; and a pressure contact/separation mechanism for moving the second roller from the retracting position to the pressure contact position. The pressure contact/separation mechanism changes the timing at which the second roller reaches the pressure contact position according to the type of a sheet to be discharged.