| 摘要 |
An image forming apparatus comprises a main body having a mounting portion and a sensing portion disposed on one sidewall of the mounting portion. A developing unit assembly has a plurality of developing units and a contacting portion is disposed on one of the developing units. The contacting portion selectively contacts the sensing portion. The bottom surface of the mounting portion is declined to block the contacting portion from contacting the sensing portion prior to the installation of all of the developing units on the mounting portion. The angle of the bottom surface becomes larger when going towards the interior of the mounting portion. The contacting portion is installed on only one developing unit, but whether the other developing units are mounted can be sensed by using the contacting portion, thereby avoiding the use of multiple contacting portions. An image forming apparatus fabricated with this structure is smaller, simpler, and has reduced manufacturing costs. |
