Patent ID: 8272637

Claim:
A sheet tray unit comprising: a particular feed tray configured to hold one or more sheets therein; and a discharge tray disposed on the particular feed tray and configured to receive a discharged sheet, the discharge tray comprising: a first discharge tray portion; a second discharge tray portion supported by the first discharge tray portion and configured to slide with respect to the first discharge tray portion in a first direction and in a second direction, wherein the second direction is opposite and substantially parallel to the first direction; and a third discharge tray portion supported by the second discharge tray portion and configured slide with respect to the second discharge tray portion in the first direction and in the second direction, wherein the first discharge tray portion comprises a tray stopper comprising a first engaging member, wherein the third discharge tray portion comprises a second engaging member, and wherein, when the third discharge tray portion slides in the first direction and reaches a predetermined position with respect to the first discharge tray portion, the first engaging member of the tray stopper of the first discharge tray portion directly engages with the second engaging member of the third discharge tray portion, such that the tray stopper prevents the third discharge tray portion from sliding beyond the predetermined position in the first direction.