Image forming apparatus having a rotary developing device

摘要

When a plurality of toner containers mounted on a developing rotary is simultaneously determined as toner-absent toner containers, toner container replacement may not be efficient because toner containers are replaced at one replacement position. Therefore, when the toner containers mounted on the developing rotary are simultaneously determined as empty (S16), a toner container is selected (S17) and moved to a replacement position (S18) so as to be preferentially replaced by considering the minimum times required for the steps of replacing a nearest toner container and inhibiting another image forming job.