Patent ID: 8602410

Claim:
A sheet stackable device, comprising: a first tray comprising a first placement plane configured to form a part of a stackable plane and to receive placement of a sheet; a second tray comprising a second placement plane configured to form a part of the stackable plane with the first placement plane, and a slider groove, the second tray being swingable, about a swing axis extending in parallel with an extending direction of the slider groove, between a first position and a second position, the first tray and the second tray being configured to form an opening between an edge of the first tray on a side of the swing axis and an edge of the second tray on a side of the swing axis when the second tray is in the first position; a first guide arranged on the first placement plane; a second guide arranged on the second placement plane and configured to slide along the slider groove in the extending direction; a first projection provided in the second guide and formed to project from the second guide in a projecting direction orthogonal to the second placement plane; and a joint configured to connect the first guide and the second guide rotatably with respect to each other, the first guide and the second guide being integrally slidable in the extending direction, a height of the joint from the second placement plane of the second tray in the projecting direction, when the second tray is in the second position, being smaller than a height of the first projection from the second placement plane of the second tray in the projecting direction, wherein a second projection projecting in a second direction orthogonal with respect to the first placement plane is formed at one end of the first guide, the joint being provided at another end of the first guide.