Patent ID: 7991322

Claim:
An image forming apparatus comprising: an apparatus main unit; a cartridge detachably attached to the apparatus main unit; a drive transmission member configured to transmit driving force to the cartridge; and an information transmission mechanism configured to transmit information about the cartridge from the cartridge to the apparatus main unit, wherein the information transmission mechanism includes: a drive member that is provided in the cartridge and that performs driving in a predetermined amount of momentum from beginning of driving operation until an end of the same as a result of driving force being transmitted from the drive transmission member when the cartridge is attached to the apparatus main unit; a swaying member that is provided in the apparatus main unit and that sways upon contact with the drive member when the drive member is driven; and a detection member that is provided in the apparatus main unit and that detects swaying action of the swaying member, and wherein the swaying member includes: a pivot extending in a direction parallel to a direction of attachment and detachment of the cartridge to and from the apparatus main unit; and a contact portion that contacts the cartridge both at times of attachment and detachment of the cartridge to and from the apparatus main unit, thereby swaying in a single direction while taking the pivot as a fulcrum.