Image forming apparatus and an accounting method therein

摘要

An image forming apparatus ( 10 ) for forming an image on a recording medium ( 30 ) such as a recording paper by applying ink is disclosed. The apparatus includes an ink discharging unit ( 20 ) that applies ink onto the recording medium to form the image; a sensor ( 6 ) that detects that a predetermined event has happened; and an accounting unit ( 2 ) that performs an account process at a predetermined adequate time based on the detection by the sensor.