Image forming apparatus and cartridge

Abstract

An image forming apparatus incluses an apparatus main body, a first cartridge that is detachably attachable to the apparatus main body, and a second cartridge that is detachably attachable to the apparatus main body. The first cartridge includes a storage chamber that stores developer, a rotational shaft provided in the storage chamber so as to be rotatable about a rotational axis line, a flexible member that has one end and an other end in a direction crossing the rotational axis line, the one end being a free end and the other end being a fixed end fixed to the rotational shaft, and a magnetism generating member that is fixed between the fixed end exclusive and the free end inclusive of the flexible member. The second cartridge includes a sensor for detecting magnetism generated by the magnetism generating member.

Dependencies are inferred from the claim text.