Sheet conveyance apparatus and image forming apparatus

A sheet conveyance apparatus comprising:

• a housing including a sheet conveyance unit;
• an opening and closing unit configured to at least one of open and close by rotating with respect to the housing, to move between a closed position and an open position, the opening and closing unit including a support unit configured to support at least one sheet at the open position, wherein the opening and closing unit is detachably attached to the housing;
• a feeding unit configured to feed a sheet of the at least one sheet supported by the support unit to the sheet conveyance unit;
• at least one regulating unit configured to regulate the opening and closing unit in the open position;
• a shaft attached to one of the opening and closing unit and the housing, configured to serve as an axis for rotation of the opening and closing unit;
• a first groove portion that includes an opening extending in a direction perpendicular to the axis for detachably engaging the shaft;
• and
• a first lock unit configured to switch between engaging and releasing the shaft within/from the first groove portion.