Sheet conveyance apparatus, image reading apparatus including sheet conveyance apparatus, and image forming apparatus

An image reading apparatus comprising:

• a base unit;
• a sheet stacking portion on which a sheet is to be stacked;
• a feeding portion configured to feed the sheet stacked on the sheet stacking portion;
• an open/close member including an upper guide that faces in a direction of an upper surface of the sheet fed by the feeding portion and that is configured to guide the sheet, and rotatably supported on the base unit;
• a conveyance guide member including a lower guide facing in a direction of a lower surface of the sheet fed by the feeding portion and, in combination with the upper guide, forming a sheet conveyance path through which the sheet is to be conveyed, and rotatably supported on the base unit;
• a reading unit disposed below the conveyance guide member and configured to read an image on the sheet fed by the feeding portion;
• a protruding portion provided on one of the open/close member and the conveyance guide member;
• and
• a fitted portion provided on the other one of the open/close member and the conveyance guide member, and configured to be fitted with the protruding portion,
• wherein the conveyance guide member is configured to rotate with respect to the base unit to expose the reading unit to outside of the image reading apparatus when viewed from above,
• wherein the reading unit that includes a transparent member configured to transmit light from the sheet through the transparent member, and that is configured to rotate with respect to the base unit so as to expose the transparent member to outside of the image reading apparatus when viewed from above, and
• wherein, in a state where the open/close member is closed, a position of the conveyance guide member in a width direction is determined by the protruding portion fitting into the fitted portion.