| 摘要 |
A full-color image forming apparatus forms a full-color image using a color-matching pattern of color components formed on an intermediate transfer belt (7). The image forming apparatus includes at least one pattern detection sensor (15a,15b) that detects the color-matching pattern and generates pattern detection signals. A seam mark-detecting sensor (16) is provided so as to detect a seam mark (17) formed on the intermediate transfer belt and generate seam mark detection signals. The seam mark-detecting sensor (16) is aligned with the pattern detection sensor on the same axis vertically extending to a traveling direction of the intermediate transfer belt. A memory (13) is provided so as to store digital signals converted from the pattern detection and seam mark detection signals. A seam mark detection signal deleting device is also provided so as to delete a prescribed seam mark detection signal from the pattern detection signals when the pattern detection signal and the prescribed seam mark detection signal simultaneously occur. A controlling device (14) is provided so as to control the image forming apparatus in accordance with the pattern detection and seam mark detection signals excluding the prescribed seam mark detection signal. <IMAGE> |
