Developing cartridge having coupling and developing roller
In a cartridge, a housing has a developer accommodating portion and includes a first side wall and a second side wall. A coupling member is disposed at a position opposite to the developer accommodating portion with respect to the first side wall. A detection body is disposed at a position opposite to the developer accommodating portion with respect to the second side wall. A first driving force transmission member is positioned at the same side with the coupling member with respect to the first side wall, and transmits driving force from the coupling member to a rotating member. A second driving force transmission member is positioned at the same side with the detection body with respect to the second side wall, and transmits driving force from the rotating member to the detection body.
1. A cartridge, comprising:
a housing configured to accommodate developer therein;
a developing roller rotatable about a first axis extending in a first direction;
a coupling rotatable about a second axis extending in the first direction, the coupling being positioned at one side of the housing;
an agitator rotatable about a third axis extending in the first direction according to the rotation of the coupling;
an electrode configured to be electrically connected to the developing roller;
a cover positioned at another side of the housing that is spaced apart from the one side in the first direction, the cover having an opening allowing a part of the electrode to be exposed to an outside of the cover; and
a first protrusion positioned at the another side of the housing, the first protrusion being movable according to the rotation of the agitator, the first protrusion extending in the first direction, a part of the first protrusion being exposed to the outside of the cover.
2. The cartridge according to claim 1 , wherein the first protrusion is positioned farther from the developing roller than the part of the electrode in a second direction.
3. The cartridge according to claim 2 , wherein the second direction is crossing the first direction.
4. The cartridge according to claim 1 , wherein an entirety of the electrode is positioned at the another side of the housing.
5. The cartridge according to claim 1 , wherein the developing roller is rotatable according to the rotation of the coupling.
6. The cartridge according to claim 1 , wherein the first protrusion moves relative to the electrode.
7. The cartridge according to claim 1 , further comprising:
a supply roller configured to supply the developer in the developer accommodating portion to the developing roller, the supply roller having a supply roller shaft;
a supply gear attached to the supply roller shaft, the supply gear being positioned at the one side of the housing; and
a developing gear attached to a developing roller shaft of the developing roller, the developing gear being positioned at the one side of the housing,
wherein the coupling has a coupling gear which is engaged with the supply gear and the developing gear.
8. The cartridge according to claim 7 ,
wherein the coupling has a large-diameter gear portion which is engaged with the developing gear and a small-diameter gear portion which is engaged with the supply gear, and
wherein a diameter of the large-diameter gear portion is larger than a diameter of the small-diameter gear portion.
9. The cartridge according to claim 7 , further comprising an agitator gear which is attached to an agitator shaft of the agitator, the agitator gear being positioned at the one side of the housing,
wherein the coupling gear is positioned between the agitator gear and the developing gear.
10. The cartridge according to claim 7 , further comprising:
an agitator gear attached to an agitator shaft of the agitator, the agitator gear being positioned at the one side of the housing; and
an idle gear positioned at the one side of the housing, the idle gear being engaged with the coupling gear and the agitator gear.
11. The cartridge according to claim 1 , further comprising:
a supply roller configured to supply the developer in the developer accommodating portion to the developing roller, the supply roller having a supply roller shaft;
a supply gear attached to the supply roller shaft, the supply gear being positioned at the one side of the housing;
an agitator gear attached to an agitator shaft of the agitator, the agitator gear being positioned at the one side of the housing; and
a gear cover fixed to the housing with screws, the gear cover covering the supply gear and the agitator gear,
wherein the gear cover has a coupling exposure opening which allows a part of the coupling to be exposed to an outside of the gear cover.
12. The cartridge according to claim 1 , wherein the first protrusion has an inclined surface.
13. The cartridge according to claim 1 , wherein the first protrusion rotates according to the rotation of the agitator.
14. The cartridge according to claim 1 , further comprising a second protrusion positioned at the another side of the housing, the second protrusion being movable according to the rotation of the agitator.
15. The cartridge according to claim 14 , wherein the first protrusion is integrally formed with the second protrusion.
16. The cartridge according to claim 1 , wherein the electrode has a bearing which has a first through-hole that rotatably supports a developing roller shaft of the developing roller and an electric-power receiving protrusion which is configured to be supplied with electric power from outside, the electric-power receiving portion including the part of the electrode.
17. The cartridge according to claim 16 , wherein the electric-power receiving protrusion is positioned at the another side of the housing.
18. The cartridge according to claim 17 , wherein the bearing is positioned at the another side of the housing.
19. The cartridge according to claim 16 , wherein the electric-power receiving protrusion extends in the first direction through the opening of the cover.
20. The cartridge according to claim 16 , wherein the electric-power receiving protrusion is made of conductive resin.
21. The cartridge according to claim 16 , further comprising a supply roller configured to supply the developer in the developer accommodating portion to the developing roller, the supply roller having a supply roller shaft,
wherein the bearing has a second through-hole which rotatably supports the supply roller shaft.
22. The cartridge according to claim 16 , wherein the electric-power receiving protrusion is integrally formed with the bearing.
23. The cartridge according to claim 16 , wherein a part of the electric-power receiving protrusion is overlapped with a part of the coupling in the first direction.
24. The cartridge according to claim 16 , wherein the electric-power receiving protrusion has a slit which extends along the first direction.
25. A cartridge, comprising:
a housing configured to accommodate developer therein;
a developing roller rotatable about a first axis extending in a first direction;
a coupling rotatable about a second axis extending in the first direction, the coupling being positioned at one side of the housing;
an agitator rotatable about a third axis extending in the first direction according to the rotation of the coupling;
an electrode positioned at another side of the housing that is spaced apart from the one side in the first direction, the electrode being configured to be electrically connected to the developing roller; and
a plate positioned at the another side of the housing, the plate moving linearly according to the rotation of the agitator.
26. The cartridge according to claim 25 , wherein the plate moves in a second direction that is crossing the first direction.
27. The cartridge according to claim 25 , further comprising a pinion gear attached to an agitator shaft of the agitator,
wherein the plate has a plurality of gear teeth which are engaged with the pinion gear.
28. The cartridge according to claim 25 , wherein the electrode is configured to be supplied with electric power from outside.
29. The cartridge according to claim 25 , wherein the electrode is made of the metal.
30. The cartridge according to claim 25 , wherein the plate moves relative to the electrode.
31. The cartridge according to claim 25 , further comprising:
a supply roller configured to supply the developer in the developer accommodating portion to the developing roller, the supply roller having a supply roller shaft;
a supply gear attached to the supply roller shaft, the supply gear being positioned at the one side of the housing; and
a developing gear attached to a developing roller shaft of the developing roller, the developing gear being positioned at the one side of the housing,
wherein the coupling has a coupling gear which is engaged with the supply gear and the developing gear.
32. The cartridge according to claim 31 , further comprising an agitator gear which is attached to an agitator shaft of the agitator, the agitator gear being positioned at the one side of the housing,
wherein the coupling gear is positioned between the agitator gear and the developing gear.
33. The cartridge according to claim 25 , further comprising:
a supply roller configured to supply the developer in the developer accommodating portion to the developing roller, the supply roller having a supply roller shaft;
a supply gear attached to the supply roller shaft, the supply gear being positioned at the one side of the housing;
an agitator gear attached to an agitator shaft of the agitator, the agitator gear being positioned at the one side of the housing; and
a gear cover fixed to the housing with screws, the gear cover covering the supply gear and the agitator gear,
wherein the gear cover has a coupling exposure opening which allows a part of the coupling to be exposed to an outside of the gear cover.