An operating mechanism for an image forming apparatus includes a translating member, a rotating member, and a rib. The translating member defines a first engagement surface. The translating member moves along an axis that extends in a first direction. The rotating member is coupled to the translating member such that the translating member is both (a) movable relative to the rotating member along the axis and (b) rotatable relative to the rotating member about the axis. The rotating member defines a second engagement surface configured to engage the first engagement surface to regulate movement of the translating member such that a rotational displacement of the translating member about the axis has a corresponding linear displacement of the translating member along the axis. The rib is coupled to the rotating member and configured to reinforce the rotating member in order to resist deformation of the rotating member.