Patent ID: 8175492

Claim:
A developer unit comprising: a case that is configured to house developer; a developer carrier that is configured to hold the developer thereon; a plate provided in the case and configured to rotate with respect to the case about a rotational axis extending in a first direction parallel to an axial direction of the developer carrier; a first pressing projection that protrudes beyond the case in a second direction parallel to the axial direction; a second pressing projection that protrudes beyond the case in a third direction parallel to the axial direction, the second pressing projection being provided with spacing from the first pressing projection in the third direction parallel to the axial direction, the first and second pressing projections being provided on the plate; a first releasing projection that protrudes beyond the case in a fourth direction parallel to the axial direction, and is spaced from the first pressing projection; a second releasing projection that protrudes beyond the case in a fifth direction parallel to the axial direction, and is spaced from the second pressing projection, the second releasing projection being provided with spacing from the first releasing projection in the fifth direction parallel to the axial direction, the first and second releasing projections being provided on the case; and an elastic member disposed between the case and the plate.