IMAGE FORMING APPARATUS CAPABLE OF CONTROLLING ACR AND METHOD FOR CONTROLLING ACR THEREOF

摘要

An image-forming apparatus and a method for controlling an auto color registration work are provided to determine a case requiring the auto color registration work accurately, thereby preventing the auto color registration work from being performed unnecessarily. A sensor(120) detects preliminary test patterns by colors on a conveying belt. A color alignment correction unit(130) checks over the present alignment state of respective colors by using data detected according to the colors by the sensor, and determines whether to perform a work for correcting relative registration positions of the respective colors based on the checked result. If the work is performed, a control unit(140) forms actual test patterns on the conveying belt and controls the sensor and the color registration correction unit to re-detect the data by the colors.