Image forming apparatus supplying toner from container to accumulating unit based on tower density developer in the accumulating unit, and method of controlling image forming apparatus

摘要

An image forming apparatus including a replaceable container having toner stored therein includes: an image forming unit including an accumulating unit for accumulating developer containing toner and configured to form an image by using the developer in the accumulating unit; a measurement unit configured to measure a toner density in the accumulating unit; a portion to which the container is attached; a supplementing unit configured to supplement the toner from the attached container to the accumulating unit; and a controller configured to control the supplementing unit based on first information corresponding to a difference between the toner density and a target toner density and second information corresponding to an accumulated value obtained by accumulating differences, wherein the second information does not change in a period from replacement of the container by another container until a predetermined number of times of supplement is performed.