Developing device and image forming apparatus having housing including a metal portion
A developing device includes a housing that includes a container portion, a rotating portion, and a developing roller. The container portion has a metal formed portion formed of metal and contains developer. The rotating portion is to be rotated so as to transport the developer contained in the container portion in a longitudinal direction. The developing roller holds the developer transported by the rotating portion. The metal formed portion is disposed in at least part of the container portion in a region superposed on a developer holding region of the developing roller in the longitudinal direction.
1. A developing device comprising:
a housing that includes
a container portion which has a metal formed portion formed of metal and which contains developer,
a rotating portion to be rotated so as to transport the developer contained in the container portion in a longitudinal direction, and
a developing roller which holds the developer transported by the rotating portion, wherein
the metal formed portion is disposed in at least part of the container portion in a region superposed on a developer holding region of the developing roller in the longitudinal direction, and extends through a thickness direction of the housing from an internal portion contacting the developer to an external portion outside of the housing.
2. The developing device according to claim 1 , wherein
the developing roller has a first shaft portion, and the housing has a support portion that is joined to the container portion and that supports the first shaft portion, and wherein
the support portion is formed of an electrically insulating material.
3. The developing device according to claim 2 , wherein
the rotating portion has a second shaft portion, and the housing has a second support portion that supports the second shaft portion, and wherein
the second support portion is formed of an electrically insulating material and integral with the support portion that supports the first shaft portion.
4. The developing device according to claim 1 , wherein
a sectional shape of the metal formed portion of the container portion is uniform in a direction perpendicular to the longitudinal direction.
5. The developing device according to claim 2 , further comprising:
a screw, wherein
the rotating portion has a second shaft portion, and the housing has a second support portion that supports the second shaft portion, wherein
the metal formed portion of the container portion has a first joining surface, the support portion has a second joining surface, and the second support portion has a third joining surface, wherein
at least one of the first joining surface, the second joining surface, and the third joining surface has a projection, wherein
the metal formed portion and the support portion or the second support portion are connected to each other by using the screw, and wherein
when the metal formed portion and the support portion are connected to each other, the projection of the first joining surface is in contact with the second joining surface, or the projection of the second joining surface is in contact with the first joining surface, and
when the metal formed portion and the second support portion are connected to each other, the projection of the first joining surface is in contact with the third joining surface, or the projection of the third joining surface is in contact with the first joining surface.
6. The developing device according to claim 3 , further comprising:
a screw, wherein
the metal formed portion of the container portion has a first joining surface, the support portion has a second joining surface, and the second support portion has a third joining surface, wherein
at least one of the first joining surface, the second joining surface, and the third joining surface has a projection, wherein
the metal formed portion and the support portion or the second support portion are connected to each other by using the screw, and wherein
when the metal formed portion and the support portion are connected to each other, the projection of the first joining surface is in contact with the second joining surface, or the projection of the second joining surface is in contact with the first joining surface, and
when the metal formed portion and the second support portion are connected to each other, the projection of the first joining surface is in contact with the third joining surface, or the projection of the third joining surface is in contact with the first joining surface.
7. The developing device according to claim 5 , wherein
the second joining surface or the third joining surface has the projection.
8. The developing device according to claim 6 , wherein
the second joining surface or the third joining surface has the projection.
9. The developing device according to claim 5 , wherein
at least one of the first joining surface, the second joining surface, and the third joining surface has a first portion surrounding the screw, and wherein
the projection is provided at least in the first portion.
10. The developing device according to claim 6 , wherein
at least one of the first joining surface, the second joining surface, and the third joining surface has a first portion surrounding the screw, and wherein
the projection is provided at least in the first portion.
11. The developing device according to claim 7 , wherein
the second joining surface or the third joining surface has a first portion surrounding the screw, and wherein
the projection is provided at least in the first portion.
12. The developing device according to claim 8 , wherein
the second joining surface or the third joining surface has a first portion surrounding the screw, and wherein
the projection is provided at least in the first portion.
13. The developing device according to claim 5 , further comprising:
a first elastic member and a second elastic member, wherein
the metal formed portion of the container portion and the support portion are connected to each other, the metal formed portion of the container portion and the second support portion are connected to each other, the first joining surface is in contact with the second joining surface at least partially through the first elastic member interposed between the first joining surface and the second joining surface, and the first joining surface is in contact with the third joining surface at least partially through the second elastic member interposed between the first joining surface and the third joining surface, and wherein
a thickness of the first elastic member and a thickness of the second elastic member exceed a projecting amount of the projection before the metal formed portion and the support portion are connected to each other and the metal formed portion and the second support portion are connected to each other.
14. The developing device according to claim 6 , further comprising:
a first elastic member and a second elastic member, wherein
the metal formed portion of the container portion and the support portion are connected to each other, the metal formed portion of the container portion and the second support portion are connected to each other, the first joining surface is in contact with the second joining surface at least partially through the first elastic member interposed between the first joining surface and the second joining surface, and the first joining surface is in contact with the third joining surface at least partially through the second elastic member interposed between the first joining surface and the third joining surface, and wherein
a thickness of the first elastic member and a thickness of the second elastic member exceed a projecting amount of the projection before the metal formed portion and the support portion are connected to each other and the metal formed portion and the second support portion are connected to each other.
15. The developing device according to claim 7 , further comprising:
a first elastic member and a second elastic member, wherein
the metal formed portion of the container portion and the support portion are connected to each other, the metal formed portion of the container portion and the second support portion are connected to each other, the first joining surface is in contact with the second joining surface at least partially through the first elastic member interposed between the first joining surface and the second joining surface, and the first joining surface is in contact with the third joining surface at least partially through the second elastic member interposed between the first joining surface and the third joining surface, and wherein
a thickness of the first elastic member and a thickness of the second elastic member exceed a projecting amount of the projection before the metal formed portion and the support portion are connected to each other and the metal formed portion and the second support portion are connected to each other.
16. The developing device according to claim 8 , further comprising:
a first elastic member and a second elastic member, wherein
the metal formed portion of the container portion and the support portion are connected to each other, the metal formed portion of the container portion and the second support portion are connected to each other, the first joining surface is in contact with the second joining surface at least partially through the first elastic member interposed between the first joining surface and the second joining surface, and the first joining surface is in contact with the third joining surface at least partially through the second elastic member interposed between the first joining surface and the third joining surface, and wherein
a thickness of the first elastic member and a thickness of the second elastic member exceed a projecting amount of the projection before the metal formed portion and the support portion are connected to each other and the metal formed portion and the second support portion are connected to each other.
17. The developing device according to claim 9 , further comprising:
a first elastic member and a second elastic member, wherein
the metal formed portion of the container portion and the support portion are connected to each other, the metal formed portion of the container portion and the second support portion are connected to each other, the first joining surface is in contact with the second joining surface at least partially through the first elastic member interposed between the first joining surface and the second joining surface, and the first joining surface is in contact with the third joining surface at least partially through the second elastic member interposed between the first joining surface and the third joining surface, and wherein
a thickness of the first elastic member and a thickness of the second elastic member exceed a projecting amount of the projection before the metal formed portion and the support portion are connected to each other and the metal formed portion and the second support portion are connected to each other.
18. The developing device according to claim 13 , wherein
the first elastic member and the second elastic member are attached to the second joining surface and the third joining surface.
19. The developing device according to claim 4 , wherein
the metal formed portion of the container portion is made by connecting a plurality of separated parts separated at a plane along the longitudinal direction as a boundary.
20. An image forming apparatus comprising:
the developing device according to claim 1 .