| 摘要 |
PROBLEM TO BE SOLVED: To easily recycle toner by recycling all the discarded toner which is recovered by a cleaning device to a black developing device, in the case where the ratio of the amount of red toner contained in all the toner recovered by the cleaning device is equal to or below a prescribed value, in an image forming device for performing two-color black and red developing. SOLUTION: When the image data of an original is sent to a writing control part 21, data on the number of writing dots is outputted to a counting part 23, and the number of dots for black developing on the original image (d1) and the number of dots for red developing (d2) are counted by the counting part 23. Next, an arithmetic operation of d2=(d1+d2)=y is performed. Provided that solution (y) denotes the ratio of the number of dots of a 2nd developing device 13 to the sum (the number of all dots) of the number of dots (cumulative image data) of a 1st developing device 9 and the number of dots (cumulative image data) of the 2nd developing device 13, and (y) is the same as the ratio of the red toner amount to the amount of all the recovered toner. In the case (y) <0.1, the discarded toner is carried to the 1st developing device 9 so as to be recycled. |
