| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of surely detecting whether or not a cartridge is attached to an apparatus body.SOLUTION: When a developing cartridge 9 is attached to a main body casing 2, the projection part 62 of the developing cartridge 9 is brought into contact with the projection part 74B of an actuator 71, to place the actuator 71 in a second position. At this time, a CPU 77 is caused to determine that the developing cartridge 9 is attached to the main body casing 2. After that, the contact part 55 of a detection gear 49 is brought into contact with the projection part 74B of the actuator 71, to place the actuator 71 in a third position, in a warming-up operation. At this time, the CPU 77 is caused to determine that the developing cartridge 9 is new.</p> |
