Image forming apparatus and unit detachably attachable to the same image forming apparatus and information displaying system related to unit detachably attachable to the same image forming apparatus

摘要

The present invention provides an image forming apparatus which has image forming device for forming an image on a recording material, at least one component element of the image forming means being formed in a unit and detachably attachable to a main body of said apparatus, and output device for outputting information of an expiration date of the unit for use.