A conveyor apparatus includes a conveyor portion, a side member having first and second side members, a connecting member, a first locking member and a driving unit. The first locking mechanism attached to the second side member locks and unlocks a connection between the second side member and the connecting member. In an unlocked state, the second member is movable along the connecting member towards or away from the first member. In a locked state, the second member is immovable relative to the first member. The driving unit is operative to move the second side member along the first direction close to or away from the first side member when the first locking mechanism is in the unlocked state and is operative to move the conveyor portion, the side member and the connecting member in unison along the first direction when the first locking mechanism is in the locked state.