Image forming apparatus and process cartridge

A cartridge comprising:

• a photosensitive drum;
• a development roller;
• a gear at least a part of which is uncovered;
• a movable member movable relative to the photosensitive drum;
• a first frame supporting the photosensitive drum;
• and
• a second frame supporting the development roller,
• wherein the movable member and the gear are positioned on one side of the cartridge in an axial direction of the photosensitive drum,
• wherein the first frame includes a projecting portion projecting outward in the axial direction on the one side of the cartridge, and
• wherein, in a pole coordinate system in a plane perpendicular to the axis, the pole coordinate system having a point of origin on the axis of the photosensitive drum, a ground line extending from the point of origin toward an axis of the gear, and a positive direction of an angle coordinate Θ in a rotational moving direction of the photosensitive drum during image forming operation, when R1 is a distance from the axis of the photosensitive drum to an addendum of the gear, and R2 is a distance from the axis of the photosensitive drum to the axis of the gear,
• (i) when the movable member is in a predetermined position, on the one side of the cartridge, a space including a region surrounded by a circle having a center on the axis of the photosensitive drum and the radius R1 are provided so as to be surrounded by the gear, the projecting portion and the movable member,
• (ii) in a range of the angle coordinate satisfying 190°<Θ<280° in the pole coordinate system, a shortest distance from the axis of the photosensitive drum and the projecting portion is Ra,
• (iii) the shortest distance Ra satisfies R1<Ra<R2, and
• (iv) in a region downstream of the part of the projecting portion and upstream of the gear, the space includes a region having a distance from the axis of the photosensitive drum exceeding Ra.

A cartridge comprising:

• a photosensitive drum;
• a development roller;
• a gear at least a part of which is uncovered;
• a movable member movable relative to the photosensitive drum;
• and
• a frame supporting the photosensitive drum and the development roller,
• wherein the movable member, the drum coupling, and the gear are positioned on one side of the cartridge in an axial direction of the photosensitive drum,
• wherein the frame includes a first projecting portion and a second projecting portion projecting in a direction of an axis of the photosensitive drum, on one side of the cartridge,
• wherein the second projecting portion is positioned downstream of the first projecting portion and the upstream of the gear in a rotational moving direction of the photosensitive drum during image forming operation,
• wherein the second projecting portion is provided at a position more remote from the axis of the photosensitive drum than the first projecting portion,
• wherein in a pole coordinate system in a plane perpendicular to the axis, the pole coordinate system having a point of origin on the axis of the photosensitive drum, a ground line extending from the point of origin toward an axis of the gear, and a positive direction of an angle coordinate Θ in a rotational moving direction of the photosensitive drum during image forming operation, when R1 is a distance from the axis of the photosensitive drum to an addendum of the gear, and R2 is a distance from the axis of the photosensitive drum to the axis of the gear, the first projected portion is positioned in the range satisfying 190°<Θ<280° in the pole coordinate system, and a distance Ra from the axis of the photosensitive drum satisfies R1<Ra<R2, and
• wherein, when the movable member is in a predetermined position, on the one side of the cartridge, a space including a region surrounded by a circle having a center on the axis of the photosensitive drum and the radius R1 are provided so as to be surrounded by the gear, the projecting portion, and the movable member.

A cartridge comprising:

• a photosensitive drum;
• a development roller;
• a gear at least a part of which is uncovered;
• a movable member movable relative to the photosensitive drum;
• and
• a frame supporting the photosensitive drum and the development roller,
• wherein the movable member, the drum coupling, and the gear are positioned on one side of the cartridge in an axial direction of the photosensitive drum,
• wherein in a pole coordinate system in a plane perpendicular to the axis, the pole coordinate system having a point of origin on the axis of the photosensitive drum, a ground line extending from the point of origin toward an axis of the gear, and a positive direction of an angle coordinate Θ in a rotational moving direction of the photosensitive drum during image forming operation, when R1 is a distance from the axis of the photosensitive drum to an addendum of the gear, and R2 is a distance from the axis of the photosensitive drum to the axis of the gear,
• (i) the frame is provided with a projecting portion projecting in a direction of the axis of the photosensitive drum in a range satisfying 190°<Θ<280°,
• (ii) the frame includes a region in which no part of the projecting portion exists, in a range downstream of the projecting portion and upstream of the gear in the rotational moving direction of the photosensitive drum,
• (iii) a distance Ra from the axis of the photosensitive drum to the projecting portion satisfies R1<Ra<R2, and
• (iv) when the movable member is in a predetermined position, on the one side of the cartridge, a space including a region surrounded by a circle having a center on the axis of the photosensitive drum and the radius R1 are provided so as to be surrounded by the gear, the projecting portion, and the movable member.