Sheet discharging apparatus, image reading apparatus, and image forming apparatus

An image reading apparatus comprising:

• a support tray on which a sheet is supported;
• a feeding portion configured to feed the sheet supported on the support tray;
• a reading portion configured to read image from the sheet fed by the feeding portion;
• a discharging portion configured to discharge the sheet from which the image has been read by the reading portion;
• a stack tray on which the sheet discharged by the discharging portion is stacked;
• and
• a swing member supported swingably by the support tray and configured to come in contact with an upper surface of the sheet stacked on the stack tray,
• wherein the stack tray includes
• (i) a first rib projecting upward and positioned within a width of the swing member in a sheet width direction perpendicular to a sheet discharge direction, wherein the first rib extends along the sheet discharge direction, is provided over a range overlapping the swing member when viewed from above, and extends such that a downstream end of the first rib in the sheet discharge direction is positioned downstream of the swing member in the sheet discharge direction,
• (ii) a first portion,
• (iii) a second portion provided at a position in the sheet discharge direction overlapping that of the first portion, wherein the second portion is closer to the center of the stack tray in the sheet width direction than the first portion is to the center of the stack tray,
• wherein the second portion includes
• (iii-a) an inclined surface higher than the first portion and inclined upward toward a downstream side in the sheet discharge direction, and
• (iii-b) a second rib positioned between the swing member and the first portion in the sheet width direction, formed such that an uppermost point of the second rib is higher than a downstream end of the inclined surface in the sheet discharge direction, and extending in parallel with the first rib,
• wherein the second rib includes a portion which protrudes from the inclined surface and whose height with respect to the inclined surface increases at a more downstream position in the sheet discharge direction, and
• wherein the uppermost point of the second rib is positioned further downstream of a downstream end of the first rib in the sheet discharge direction.