| 摘要 |
<P>PROBLEM TO BE SOLVED: To automatically apply a tension, when an image forming apparatus is installed and a toner cartridge is attached, in the image forming apparatus configured so that the tension is not applied to an image formation endless belt in shipping. <P>SOLUTION: Even when a drum cartridge 3F in which a developing cartridge is not attached to an attachment part 3G is attached, a top end surface 14C of a stopper member 14 passes through a hole part 3J formed in an attachment part 3G and the stopper member 14 stays in a position shown by the figure 5. Therefore, the position of a bearing part 13A of a driven roller is held against a compression coil spring 13C, so that the tension is not applied to a transfer conveyance belt 12C. When the developing cartridge is attached to the drum cartridge 3F, the developing cartridge is fitted into the hole part 3J, to press the top end surface 14C, the stopper member 14 is moved downward, and the bearing part 13A slides into a recessed part 14B, to apply the tension. <P>COPYRIGHT: (C)2013,JPO&INPIT |
