| 摘要 |
A color image forming apparatus comprises: a speed detector for detecting the speed of an intermediate transferring body or a driven roller that is driven by a conveying belt; a calculation device for calculating a difference between a target speed and the speed of the intermediate transferring body or of the conveying belt obtained by the speed detector; and a drive controller including a speed correction unit for employing the speed difference obtained by the calculation device to correct the speed of the intermediate transferring body or of the conveying belt. According, to an image quality control method for the color image forming apparatus, in the low-speed printing mode, before an actual image is formed on a transfer material conveyed along the conveying belt or on the intermediate transferring body, speed correction is performed at the 1/1-speed. After the speed correction has been completed, the speed in the low-speed mode is determined, and the speed correction for the intermediate transferring body or the conveying belt is not thereafter performed during the printing. Since the speed correction for the low-speed mode printing is precisely performed, misregistration of images can be reduced.
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