Developer container, developing device, process cartridge, toner container, sub-hopper, and image forming apparatus which have multiple partitions disposed between a first housing and a second housing

1 . A developer container comprising:

a first housing to store developer;

a rotator rotatable to draw an imaginary first rotation trajectory in the first housing;

a second housing to store the developer, the second housing communicating with the first housing;

a developer conveyor in the second housing to convey the developer from the second housing to the first housing,

the developer conveyor including:

a rotation shaft; and

a flexible sheet extending from the rotation shaft in a radial direction, and

the developer conveyor rotatable about the rotation shaft to draw an imaginary second rotation trajectory, the imaginary second rotation trajectory overlapping at least a part of the imaginary first rotation trajectory under an imaginary condition in which the flexible sheet does not contact any member and does not bend; and

multiple partitions disposed between the first housing and the second housing and arranged at intervals in a rotation shaft direction,

wherein:

the multiple partitions are contactable by the flexible sheet rotating around the rotation shaft,

the multiple partitions are integrally connected to a bottom of the first housing and a bottom of the second housing to form a single component with the first housing and the second housing, and

a height from the bottom of the first housing to a top of each of the multiple partitions is equal to or greater than a height from the bottom of the first housing to a top of the imaginary first rotation trajectory of the rotator.

2 . A developer container, comprising:

a first housing to store developer;

a rotator rotatable to draw an imaginary first rotation trajectory in the first housing;

a second housing to store the developer, the second housing communicating with the first housing;

a developer conveyor in the second housing to convey the developer from the second housing to the first housing,

the developer conveyor including:

a rotation shaft; and

a flexible sheet extending from the rotation shaft in a radial direction, and

the developer conveyor rotatable about the rotation shaft to draw an imaginary second rotation trajectory, the imaginary second rotation trajectory overlapping at least a part of the imaginary first rotation trajectory under an imaginary condition in which the flexible sheet does not contact any member and does not bend; and

multiple partitions disposed between the first housing and the second housing and arranged at intervals in a rotation shaft direction,

wherein:

the multiple partitions are contactable by the flexible sheet rotating around the rotation shaft,

the multiple partitions are components different from the first housing and the second housing and disposed between a bottom of the first housing and a bottom of the second housing, and

a height from a bottom of the first housing to a top of each of the multiple partitions is equal to or greater than a height from the bottom of the first housing to a top of the imaginary first rotation trajectory of the rotator.

3 . The developer container according to claim 1 , further comprising:

multiple flexible sheets including the flexible sheet,

the multiple flexible sheets arranged at intervals on the rotation shaft in the rotation shaft direction.

4 . A developer container, comprising:

a first housing to store developer;

a rotator rotatable to draw an imaginary first rotation trajectory in the first housing;

a second housing to store the developer, the second housing communicating with the first housing;

a developer conveyor in the second housing to convey the developer from the second housing to the first housing,

the developer conveyor including:

a rotation shaft; and

a flexible sheet extending from the rotation shaft in a radial direction, and

the developer conveyor rotatable about the rotation shaft to draw an imaginary second rotation trajectory, the imaginary second rotation trajectory overlapping at least a part of the imaginary first rotation trajectory under an imaginary condition in which the flexible sheet does not contact any member and does not bend; and

multiple partitions disposed between the first housing and the second housing and arranged at intervals in a rotation shaft direction,

wherein:

the multiple partitions are contactable by the flexible sheet rotating around the rotation shaft,

the developer container further comprises multiple flexible sheets including the flexible sheet, the multiple flexible sheets disposed at intervals on the rotation shaft in the rotation shaft direction, and

the multiple flexible sheets extend separately in at least two different radial directions.

5 . The developer container according to claim 3 , wherein:

the multiple flexible sheets extend separately in at least two different radial directions.

6 . The developer container according to claim 1 , wherein the flexible sheet includes:

a root joined to the rotation shaft; and

multiple flexible sheet portions arranged at intervals in the rotation shaft direction.

7 . The developer container according to claim 1 , wherein;

a width of the flexible sheet in the rotation shaft direction is larger than an interval between adjacent partitions of the multiple partitions, the adjacent partitions contactable with both ends of the flexible sheet in the rotation shaft direction.

8 . The developer container according to claim 1 , wherein;

the flexible sheet has a width in the rotation shaft direction to contact at least three of the multiple partitions.

9 . The developer container according to claim 1 , further comprising:

another partition disposed away from the rotator in the first housing not to contact the rotator, disposed at a position of one of the intervals in the rotation shaft direction, and arranged to contact the flexible sheet.

10 . The developer container according to claim 1 , further comprising:

another flexible sheet disposed at a position of one of the intervals in the rotation shaft direction on the rotation shaft,

wherein the flexible sheet is disposed on the rotation shaft to face at least one of the multiple partitions, and

said another flexible sheet draws an imaginary rotation trajectory not overlapping the imaginary first rotation trajectory of the rotator under an imaginary condition that said another flexible sheet does not contact any member and does not bend.

11 . The developer container according to claim 10 , wherein:

the flexible sheet has a tip and multiple flexible sheet portions extending from the tip to the rotation shaft, and

said another flexible sheet is between adjacent flexible sheet portions of the multiple flexible sheet portions.

12 . The developer container according to claim 1 , wherein:

the developer conveyor rotates such that a tip of the flexible sheet moves from a side of the second housing away from the first housing, passes through a bottom of the second housing, approaches the first housing, passes by a ceiling of the second housing, and returns to the side of the second housing away from the first housing again.

13 . A developing device comprising:

the developer container according to claim 1 .

14 . The developing device according to claim 13 , further comprising:

a developing roller;

a supply roller to supply developer to the developing roller; and

a doctor blade to level an amount of the developer supplied to the developing roller,

wherein the developing roller, the supply roller, and the doctor blade are disposed in the first housing.

15 . A process cartridge comprising:

the developing device according to claim 13 .

16 . A toner container comprising:

the developer container according to claim 1 .

17 . A sub-hopper to store developer supplied to a toner container and supply the developer to a developing device, comprising:

the developer container according to claim 1 .

18 . An image forming apparatus comprising:

the developer container according to claim 1 .

19 . The developer container according to claim 1 , wherein:

the multiple partitions are components different from the first housing and the second housing and disposed between a bottom of the first housing and a bottom of the second housing, and

a height from a bottom of the first housing to a top of each of the multiple partitions is equal to or greater than a height from the bottom of the first housing to a top of the first rotation trajectory of the rotator.

20 . The developer container according to claim 1 , further comprising:

multiple flexible sheets including the flexible sheet, the multiple flexible sheets extending separately in at least two different radial directions.