Sheet conveyance apparatus and image forming apparatus

A sheet conveyance apparatus configured to convey a sheet comprising:

• a casing;
• a belt unit including a conveyance belt provided at the belt unit detachably and configured to convey the sheet;
• an accommodating unit configured to accommodate the belt unit, the accommodating unit including a pivot shaft provided along a sheet conveyance direction, the accommodating unit being configured to be moved to an opening position and a closed position by rotating with respect to the casing;
• a moving unit configured to move the belt unit with respect to the accommodating unit to a first position accommodated in the accommodating unit and a second position projecting from the accommodating unit;
• and
• a rotary member arranged to face the belt unit and configured to convey the sheet by nipping the sheet with the conveyance belt in a case where the accommodating unit is positioned at the closed position and the belt unit is positioned at the first position,
• wherein the accommodating unit and the belt unit are configured to be moved to a first state, a second state, and a third state,
• wherein, in the first state, the accommodating unit is positioned at the closed position and the belt unit is positioned at the first position to convey the sheet by the conveyance belt,
• wherein, in the second state, the accommodating unit is positioned at the opening position and the belt unit is positioned at the first position to open a sheet conveyance path, and
• wherein, in the third state, the accommodating unit is positioned at the opening position and the belt unit is positioned at the second position to allow the conveyance belt to attach to and detach from the belt unit.