Drum cartridge and developing cartridge capable of suppressing variation in position of electrical contact surface
A drum cartridge includes: a drum frame to which a developing cartridge including a storage medium having an electrical contact surface is detachably attachable; a photosensitive drum; a transfer roller; and a conveying roller. The drum is rotatable about a first axis extending in a first direction and positioned at one end portion of the frame in a second direction. The transfer roller is rotatable about a second axis extending in the first direction and in contact with the drum. The conveying roller is rotatable about a third axis extending in the first direction and separated from the transfer roller in the second direction. A first opening of the frame is positioned between the transfer roller and the conveying roller in the second direction. The electrical contact surface is exposed to an outside through the first opening in a case where the developing cartridge is attached to the frame.
1. A developing cartridge comprising:
a casing configured to accommodate toner therein, the casing having a first end portion and a second end portion in a first direction, the casing having a third end portion and a fourth end portion in a second direction;
a developing roller rotatable about a developing roller axis extending in the first direction, the developing roller being positioned at the third end portion of the casing;
a supply roller rotatable about a supply roller axis extending in the first direction, the supply roller being in contact with a surface of the developing roller;
a developing electrode for supplying electric power to the developing roller, the developing electrode having a developing contact surface, the developing contact surface being positioned at the first end portion of the casing;
a supply electrode for supplying electric power to the supply roller, the supply electrode having a supply electrode surface, the supply electrode surface being positioned at the first end portion of the casing; and
a storage medium having an electrical contact surface, the electrical contact surface being positioned closer to the second end portion of the casing than the first end portion of the casing is to the second end portion, the electrical contact surface being positioned closer to the third end portion of the casing than the fourth end portion is to the third end portion.
2. The developing cartridge according to claim 1 , wherein the developing contact surface faces in the first direction, and wherein
the electrical contact surface faces in a third direction crossing the first direction and the second direction.
3. The developing cartridge according to claim 2 , wherein the supply contact surface faces in the first direction.
4. The developing cartridge according to claim 1 , wherein the developing contact surface is positioned at an outer surface of the first end portion of the casing, and wherein
the supply contact surface is positioned at the outer surface of the first end portion of the casing.
5. The developing cartridge according to claim 1 , wherein the developing electrode is made of an electrically conductive resin.
6. The developing cartridge according to claim 1 , wherein the supply electrode is made of an electrically conductive resin.
7. The developing cartridge according to claim 1 , wherein the developing electrode protrudes in the first direction, and wherein
the supply electrode protrudes in the first direction.
8. The developing cartridge according to claim 1 , wherein the developing roller includes a developing roller shaft extending in the first direction, wherein
the developing roller shaft has a first end and a second end in the first direction, the first end of the developing roller shaft is positioned at the first end portion of the casing, the second end of the developing roller shaft is positioned at the second end portion of the casing, and wherein
the developing electrode includes a developing roller bearing attached to the first end of the developing roller shaft.
9. The developing cartridge according to claim 1 , wherein the supply roller includes a supply roller shaft extending in the first direction, wherein
the supply roller shaft has a first end and a second end in the first direction, the first end portion of the supply roller shaft is positioned at the first end portion of the casing, the second end of the supply roller shaft is positioned at the first end of the casing, and wherein
the supply electrode includes a supply roller bearing attached to the first end of the supply roller shaft.
10. The developing cartridge according to claim 1 , wherein the developing roller includes a developing roller shaft extending in the first direction, and wherein
the developing contact surface is separated from the developing roller shaft in the second direction.
11. The developing cartridge according to claim 1 , wherein the supply roller includes a supply roller shaft extending in the first direction, and wherein
the supply contact surface is separated from the supply roller shaft in the second direction and a third direction crossing the first direction and the second direction.
12. The developing cartridge according to claim 1 , further comprising a coupling rotatable about a coupling axis extending in the first direction, the coupling rotatable together with the developing roller and the supply roller, the coupling being positioned at the second end portion of the casing.
13. The developing cartridge according to claim 12 , wherein the coupling has a recessed portion in the first direction.
14. The developing cartridge according to claim 1 , further comprising an agitator rotatable about an agitator axis extending in the first direction, the agitator being separated from the developing roller in the second direction, and wherein
the electrical contact surface is positioned between the developing roller and the agitator in the second direction.
15. The developing cartridge according to claim 14 , wherein the developing contact surface is positioned between the developing roller and the agitator in the second direction, and wherein
the supply contact surface is positioned between the developing electrode and the agitator in the second direction.
16. The developing cartridge according to claim 1 , wherein the developing roller includes a developing roller shaft extending in the first direction, the developing roller shaft has a first end and a second end in the first direction, the first end of the developing roller shaft is positioned at the first end portion of the casing, the second end of the developing roller shaft is positioned at the second end portion of the casing, wherein
the developing cartridge further comprises:
a developing gear attached to the second end of the developing roller shaft in the first direction, the developing gear rotatable together with the developing roller; and
a gear cover attached to an outer surface of the second end portion of the casing, the gear cover covering at least a portion of a circumference of the developing gear, and wherein
the electrical contact surface is positioned at an outer surface of the gear cover.
17. The developing cartridge according to claim 16 , wherein the storage medium is fixed to the outer surface of the gear cover with adhesive.
18. The developing cartridge according to claim 16 , wherein the gear cover includes a protrusion for fixing the casing in position relative to a drum frame of a drum cartridge, and wherein
the electrical contact surface is aligned with the protrusion in a third direction crossing the first direction and the second direction.
19. The developing cartridge according to claim 1 , wherein the casing has a fifth end portion and a sixth end portion in a third direction crossing the first direction and the second direction, wherein
the casing includes a plurality of ribs positioned at an outer surface of the fifth end portion of the casing, the plurality of the rib extending in the second direction, and wherein
the electrical contact surface is positioned at the outer surface of the fifth end portion of the casing.
20. The developing cartridge according to claim 19 , wherein the plurality of ribs is aligned with the electrical contact surface in the first direction.