JP2003295559A5 - - Google Patents

Description

[0063]
Next, in step S4, it is determined whether the image formation is a black single color, and in the case of a black single color YES, the number n of black single color image formation is counted up by "1" in step S5. The black single-color image formation number n is the number of images not formed by the Y image forming unit 317, the M image forming unit 318, and the C image forming unit 319, and color band formation is performed by these Y, M, and C image forming units. Used to determine whether to perform an action. Then, in step S6, it is determined whether the number n of black single-color image formation exceeds the predetermined value 500, and if YES, it is determined in step S7 whether the number of paper feed f in the job exceeds the predetermined value 50 In the case of YES, the color band forming operation is executed in the Y, M, and C image forming units other than black in step S8 while the sheet is stopped at the registration roller position. In this operation, a belt-shaped toner image having a width of 2 mm is formed on the photosensitive drum in each of the Y, M, and C image forming portions, and this is transferred to the transfer belt. To recover. Then, at the end of this operation, the number n of black monochrome images is cleared to 0, and in step S9, the sheet is fed from the registration roller at a predetermined timing, and the job is continued.