Photosensitive member cartridge, developer cartridge and process cartridge

1. A process cartridge, comprising:

a developer frame portion including a developer carrying member, a developer housing section for housing a developer, and a first extension portion, the developer housing section being positioned between the developer carrying member and the first extension portion in a length direction, and the developer carrying member and the first extension portion being on opposite sides of the developer housing section; and

a photosensitive member frame portion including a photosensitive member housing section for housing a photosensitive member, a developer frame portion receiving section to which the developer frame portion can be attached; and a second extension portion, the developer frame portion receiving section being positioned between the photosensitive member housing section and the second extension portion in the length direction;

wherein when the photosensitive member frame portion is attached to the developer frame portion, the first extension portion and the second extension portion are positioned in a substantially overlapping configuration and the first extension portion engages the second extension portion so as to urge the developer carrying member toward the photosensitive member.

2. The process cartridge of claim 1 , wherein the photosensitive member housing portion further includes a transfer member positioned below the photosensitive member body.

3. The process cartridge of claim 1 , wherein the process cartridge is substantially box-shaped with a protruding portion protruding from a bottom surface of the photosensitive member frame portion substantially below the photosensitive member housing portion.

4. The process cartridge of claim 3 , wherein the protruding portion is substantially V-shaped, when viewed from a side in the width direction substantially perpendicular to the length direction.

5. The process cartridge of claim 1 , wherein at least a portion of a bottom surface of the photosensitive member housing section and the developer frame portion receiving section includes a plurality of paper guiding ribs arrayed along the bottom surface in the width direction substantially perpendicular to the length direction, each of the paper guiding ribs extending substantially in the length direction.

6. The process cartridge of claim 5 , wherein at least a portion of an upper surface of the developer frame portion receiving section includes a plurality of paper guiding ribs arrayed along the upper surface in the width direction, each of the paper guiding ribs extending substantially in the length direction.

7. The process cartridge of claim 6 , wherein at least a portion of a bottom surface of the developer frame portion in a position substantially below the developer carrying member includes a plurality of paper guiding ribs arrayed along the bottom surface of the developer frame portion in the width direction, each of the paper guiding ribs extending substantially in the length direction;

wherein the plurality of paper guiding ribs of the developer frame portion substantially face the plurality of paper guiding ribs of the upper surface of the developer frame portion receiving section.

8. The process cartridge of claim 1 , wherein:

the photosensitive member frame portion includes a first side wall and a second side wall positioned opposite from each other in a width direction perpendicular to the length direction;

the developer frame portion includes a third side wall and a fourth side wall positioned opposite from each other in the width direction.

9. The process cartridge of claim 8 , wherein at least one of the third side wall and the fourth side wall includes a projecting member extending outwardly from the at least one of the third side wall and the fourth side wall.

10. The process cartridge of claim 9 , wherein the second extension portion includes a groove for receiving the projecting member when the developer frame portion is attached to the photosensitive member frame portion.

11. The process cartridge of claim 10 , wherein the second extension portion includes a pressing portion pressing the projecting member toward the photosensitive member body to urge the developer carrying member toward the photosensitive member body and secure the developer frame portion to the photosensitive member frame portion when the developer frame portion is attached to the photosensitive member frame portion.

12. The process cartridge of claim 11 , wherein each of the first, second, third and fourth side walls includes an opening or window portion, and when the developer frame portion is attached to the photosensitive member frame portion, the openings or window portions are substantially aligned in the width direction.

13. The process cartridge of claim 1 , wherein when the developer frame portion is attached to the photosensitive member frame portion, an outer portion of the first extension portion and an outer portion of the second extension portion form a substantially flat outer surface along a thickness direction, the thickness direction being perpendicular to the length direction and an axis of rotation of the photosensitive member.

14. The process cartridge of claim 13 , wherein a cavity is formed in the substantially flat outer surface, inner surfaces of the cavity being defined by the second extension portion.

15. The process cartridge of claim 14 , wherein the cavity is positioned substantially centrally on the outer surface in a width direction perpendicular to the length direction and the thickness direction.

16. The process cartridge of claim 1 , wherein the photosensitive member housing section and the second extension portion are on opposite sides of the developer frame portion receiving section.

17. The process cartridge of claim 1 , wherein:

the first extension portion extends from the developer housing section in the length direction at a top portion of the developer housing section,

the second extension portion extends from the developer frame portion receiving section portion in the length direction at a bottom portion of the developer housing section opposite the top portion when the photosensitive member frame portion is attached to the developer frame portion, and

the first extension portion and the second extension portion substantially overlap in the length direction.

18. The process cartridge of claim 1 , wherein:

the first extension portion includes a first extension extending from a top portion of the developer housing section and away from the developer housing section in a first direction substantially perpendicular to the width direction and a second extension extending away from the first extension in a second direction different from the first direction,

the first extension is located between the developer housing section and the second extension, and

the first extension extends substantially horizontally away from the developer housing section in the length direction.