Recording sheet stacking tray

A recording sheet stacking tray on which recording sheets to be fed into an image forming apparatus are stacked, the recording sheet stacking tray comprising:

• a sheet feed tray main body comprising a first turning fulcrum extending perpendicular to a sheet feed direction of the recording sheets in a plan view;
• a sub-tray attached to the sheet feed tray main body such that the sub-tray is turnable about the first turning fulcrum and extendable from the sheet feed tray main body;
• and
• a trailing edge restriction member attached to the sub-tray and configured to restrict trailing edges of the recording sheets in the sheet feed direction,
• wherein:
• the sub-tray comprises a first sub-tray which is turnable about the first turning fulcrum, and a second sub-tray which is slidably extendable relative to the first sub-tray in the sheet feed direction,
• the second sub-tray comprises a second turning fulcrum extending perpendicular to the sheet feed direction of the recording sheets in plan view, and the trailing edge restriction member is attached to the second sub-tray such that the trailing edge restriction member is turnable about the second turning fulcrum and extendable from the second sub-tray,
• a protrusion is formed on an upper portion of the trailing edge restriction member, and an insertion hole corresponding to the protrusion is formed in an upper surface of the sheet feed tray main body at a position downstream of the first turning fulcrum in the sheet feed direction,
• the first sub-tray is turnable about the first turning fulcrum to be in at least one of (i) a first state in which an end of the second sub-tray at which the trailing edge restriction member is attached is positioned upstream of the first turning fulcrum in the sheet feed direction, and (ii) a second state in which the end of the second sub-tray at which the trailing edge restriction member is attached is positioned downstream of the first turning fulcrum in the sheet feed direction, and
• when the first sub-tray is turned about the first fulcrum to be in the second state, and the trailing edge restriction member is turned about the second turning fulcrum so as to be extended from the second sub-tray, the protrusion formed on the upper portion of the trailing edge restriction member is engageable with the insertion hole such that a surface of the trailing edge restriction member, which faces upstream in the sheet feed direction when the first sub-tray is turned to be in the first state and the trailing edge restriction member is turned so as to be extended from the second sub-tray, instead faces downstream in the sheet feed direction.