| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce force necessary to separate a photosensitive drum from a developing roller in a cartridge having a contact/separation mechanism with the photosensitive drum and the developing roller.SOLUTION: When a force for resisting to an energizing force is given to a developing apparatus 4, the developing apparatus 4 rotates with a support shaft 125a as a center and a developing roller 41 separates from a developing roller 41. In such a configuration, there is provided a long round hole 46 for slidably holding the support shaft 125a within a plane perpendicular to the support shaft 125a. In a plane perpendicular to a rotation axis of the developing roller 41, a spring hook part 46d, to which a pressurizing force of a pressure spring 55 operates in the developing apparatus 4 in a projection plane when each constituent component is projected on a plane perpendicular to the rotation axis of the developing roller 41, is located in a region between a straight line D1 connecting a rotation center 41d of the developing roller 41 and a rotation center 1c of the photosensitive drum 1 and a straight line D3 in parallel to a slide direction of the support shaft 125a passing through the support shaft 125a.</p> |
