Developing cartridge

A developing cartridge, configured to be detachably mounted to an image forming device, the developing cartridge comprising:

• a casing configured to accommodate developer, wherein the casing has a first side and a second side opposite each other in a first direction, and a third side and a fourth side opposite each other in a second direction;
• an input gear on the first side of the casing, configured to receive a driving force from an outside of the developing cartridge and being rotatable about an input gear axis extending in the first direction;
• a developing roller located on the third side of the casing;
• a chip comprising an electrical contact surface on the first side of the casing;
• and
• a first protrusion comprising a first force receiving surface, and located on the first side of the casing;
• wherein the electrical contact surface is fixed relative to the casing;
• wherein, when the developing cartridge is mounted in the image forming device, the first force receiving surface is configured to receive a force, thereby moving the developing cartridge against gravity;
• wherein, in the second direction, a distance between the first protrusion and the developing roller is greater than a distance between the first protrusion and the electrical contact surface.