摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device capable of making a first printing time as short as possible with respect to copying executed just after finishing warm-up in a tandem type image forming device having a transfer belt retreating mechanism separating a photoreceptor drum and a transfer belt which do not take part in forming an image when forming a monochrome image. SOLUTION: When an original is set and the start of copying is designated in the midst of warm-up, reading an original is started(steps S3 and S4), and whether or not the original is a color original is discriminated(step S5). In the case of judging that the first page of the original is the color original, a rocking frame is moved to a non-retreat position(step S6), and in the case of judging that it is the monochrome image, the rocking frame is moved to a retreat position(step S7). Such retreating and non-retreating operation is finished in the midst of warm-up, and copying for the first page of the original is started as soon as the warm-up is finished(steps S8 and S9). |