Abstract: An adapter is installed on a cartridge detachably disposed on a main body of an image forming apparatus. The main body includes a first conductive contact and a protective structure. The protective structure is disposed on a rear frame of the main body. The protective structure includes a protective element. When the cartridge is not inserted into the main body, the protective element is in a first position to protect the first conductive contact. The cartridge includes a housing, an accommodation part, and a second conductive contact. The accommodation part is disposed on the housing. The second conductive contact is used to electrically connect with the first conductive contact. The adapter includes a pressing element that is used to cooperate with the protective structure.

Abstract: An adapter is provided. The adapter is installed on a cartridge that is detachably arranged on a main body of an image forming apparatus, the image forming apparatus including an accommodation cavity, a conductive unit, a matching unit, and an electric signal responding unit. The adapter includes an electric signal triggering assembly configured to electrically connect with the conductive unit and trigger the electric signal responding unit to obtain a predetermined responding signal, when the electric signal triggering assembly is installed on the cartridge and the cartridge is installed to the predetermined position in the accommodation cavity. The predetermined responding signal is configured to determine whether an installation of the cartridge meets an expectation.