Document transport device including stopper for prevention of falling of document and image forming apparatus

A document transport device comprising:

• a paper feed tray on which a document is placed;
• a transport device configured to transport the document placed on the paper feed tray;
• an ejection tray that is disposed below the paper feed tray and loaded with the document ejected from the transport device in a predetermined ejection direction;
• and
• a stopper configured to prevent the document from falling from the ejection tray in the ejection direction,
• wherein the stopper includes
• a rotating shaft rotatably supported at the ejection tray in a direction intersecting the ejection direction,
• a contact piece that is provided at the rotating shaft and hit by a tip of a document in the ejection direction, and
• a weight piece that is provided at the rotating shaft and pivots along with the rotating shaft, and
• the stopper is able to pivot to be in a standing posture in which the contact piece stands due to the weight of the weight piece and pivot to be in a tilting posture in which the stopper tilts in the ejection direction from the standing posture when a predetermined force is applied to the contact piece,
• wherein the ejection tray includes a guide groove formed in the ejection direction to guide the rotating shaft, and
• when the rotating shaft is moved in the direction opposite to the ejection direction along the guide groove, the stopper is housed below a top surface of the ejection tray and only a part of the stopper protrudes from the top surface of the ejection tray,
• wherein, when the rotating shaft is moved in the direction opposite to the ejection direction along the guide groove, the contact piece comes in contact with a support piece provided at an end part of the ejection tray and be pressed by the support piece, and the pressing causes the stopper to pivot around the rotating shaft to be in a posture in which the stopper is housed below the top surface of the ejection tray.