| 主权项 |
1. A cartridge removably mountable to a main body of an image forming apparatus, the cartridge comprising:
a developing unit having a developing roller configured to perform development in contact with a photosensitive drum; two support mechanisms each configured to rotatably support the developing unit by a rotary shaft at an each end of both ends of the cartridge in a direction parallel to a rotary shaft of the developing roller; and a biasing member provided on a same side as one of the two support mechanisms with respect to the developing unit, the biasing member being configured to apply a biasing force to the developing unit so as to bring the developing roller into contact with the photosensitive drum, wherein, when a force against the biasing force is applied to the developing unit, the developing unit is rotated about the support shaft so that the developing roller is separated from the photosensitive drum, wherein the one of the two support mechanisms has a bearing configured to hold the support shaft in a manner that the support shaft is slidable in a plane orthogonal to the support shaft, and wherein, in a projection plane, onto which structural members of the cartridge are projected, orthogonal to the rotary shaft of the developing roller, an action point at which the biasing force of the biasing member acts on the developing unit is arranged in a region between a first straight line connecting a rotation center of the developing roller and a rotation center of the photosensitive drum, and a second straight line passing through the support shaft and being parallel to a slide direction of the support shaft. |
