DETECTION GEAR PROVIDED WITH PROTRUSION, AND DEVELOPING CARTRIDGE PROVIDED WITH THE SAME

摘要

A developing cartridge may include: a casing; a first gear; and a second gear. The first gear may include: a small-diameter gear portion and a large-diameter gear portion. The second gear may include: a first columnar portion; a second columnar portion; a first engaging portion; a second engaging portion; and a protrusion. The first engaging portion may be provided at the first columnar portion and may be engageable with the small-diameter gear portion. The second engaging portion may be provided at the second columnar portion and positioned closer than the first engaging portion to the casing in the axials direction. The second engaging portion may be engageable with the large-diameter gear portion. The protrusion may be rotatable together with the first and second engaging portions. The second engaging portion may be engageable with the large-diameter gear portion after the first engaging portion has engaged with the small-diameter gear portion.