Roller holding unit, cartridge and image forming apparatus

An image forming apparatus, comprising:

• a frame body;
• a photosensitive drum;
• a roller member having a shaft portion and rotating in a state in contact with the photosensitive drum at image formation;
• a bearing member rotatably supporting the shaft portion and held by the frame body movably in a direction in which a distance between the bearing member and the photosensitive drum changes;
• a first biasing member for biasing the bearing member in a first direction with respect to the frame body, the first direction being a direction in which the bearing member approaches the photosensitive drum;
• a first regulating member configured to regulate movement of the bearing member in the first direction from a first position, the first position being a position where the bearing member is positioned in a state where the photosensitive drum is not assembled to the image forming apparatus;
• a separating member rotatable around the shaft portion;
• a second biasing member configured to bias the separating member in a second direction, which is a rotating direction around the shaft portion, with respect to the frame body;
• and
• a second regulating member configured to regulate rotation of the separating member in the second direction,
• wherein the separating member has a cylinder portion attached to an end part in an axial direction of the shaft portion and a projecting portion projecting in a radial direction of the shaft portion from the cylinder portion.

A cartridge configured to be detachably attached to an apparatus main body of an image forming apparatus, comprising:

• a frame body;
• a photosensitive drum;
• a roller member having a shaft portion and rotating in a state in contact with the photosensitive drum at image formation;
• a bearing member rotatably supporting the shaft portion and held by the frame body movably in a direction in which a distance between the bearing member and the photosensitive drum changes;
• a first biasing member for biasing the bearing member in a first direction with respect to the frame body, the first direction being a direction in which the bearing member approaches the photosensitive drum;
• a first regulating member configured to regulate movement of the bearing member in the first direction from a first position, the first position being a position where the bearing member is positioned in a state where the photosensitive drum is not assembled to the cartridge;
• a separating member rotatable around the shaft portion;
• a second biasing member configured to bias the separating member in a second direction, which is a rotating direction around the shaft portion, with respect to the frame body;
• and
• a second regulating member configured to regulate rotation of the separating member in the second direction,
• wherein the separating member has a cylinder portion attached to an end part in an axial direction of the shaft portion and a projecting portion projecting in a radial direction of the shaft portion from the cylinder portion.