JP2021047258A5 - - Google Patents

Claims (12)

a frame body including a storage chamber for storing a developer and a replenishment port for supplying the developer from the outside into the storage chamber;
a rotating shaft portion rotatably supported by the frame; and a sheet member having one end fixed to the rotating shaft portion and the other end serving as a free end, which is rotatable with the rotating motion of the rotating shaft portion. an agitating member for agitating the developer in the storage chamber together with
A developing device having
The free end of the sheet member can come into contact with the inner wall surface of the storage chamber in which the supply port is formed, and the area of the sheet member that can come into contact with the inner wall surface of the storage chamber. A developing device, wherein a through-hole is provided through a sheet member in a thickness direction thereof. 2. The developing device according to claim 1, wherein the through hole is arranged at a position overlapping a position where the replenishment port is provided in the axial direction of the rotating shaft portion. When viewed from the axial direction of the rotating shaft,
The position where the seat member is fixed to the rotating shaft portion is defined as a position A,
Let L be the distance between position A and the center position of the supply port in the direction of rotation of the rotating shaft,
Let S1 be the length from the position A in the sheet member to one end of the through hole closer to the free end of the sheet member,
When the length from the position A in the sheet member to the other end of the through hole closer to the rotation shaft portion of the sheet member is S2,
S1>L>S2
3. The developing device according to claim 1, wherein the through holes are provided in the sheet member so that The ratio of the length of the through hole to the length of the sheet member in the axial direction of the rotating shaft portion is 0.2 or less, according to any one of claims 1 to 3. developing device. The sheet member comprises a first sheet member and a second sheet member,
5. The developing device according to claim 1, wherein the first sheet member and the second sheet member are attached at different positions in the circumferential direction of the rotating shaft portion. 6. The developing device according to claim 5, wherein the through holes are provided in the first sheet member and the second sheet member. The first sheet member and/or the second sheet member has a first sheet portion and a second sheet portion attached to the rotating shaft portion in a state of being overlapped in a thickness direction. 7. The developing device according to claim 5 or 6. The first seat portion is located downstream and the second seat portion is located upstream in the rotation direction of the rotating shaft portion,
A free length of the first seat portion from a fixed end fixed to the rotating shaft portion to a free end is longer than a free length of the second seat portion, and the free end of the second seat portion is: A free end of the first sheet portion can contact the inner wall surface without contacting the inner wall surface,
8. The developing device according to claim 7, characterized in that: The frame body is provided above the accommodating chamber in the direction of gravity in a posture during use, and has a developing chamber in which a developer carrying member for carrying a developer is arranged,
9. The developing device according to claim 1, wherein the stirring member conveys the developer contained in the containing chamber to the developing chamber. 10. A developing device according to claim 9, wherein said developing chamber further comprises a supply member for supplying developer to said developer carrier. a developing device according to any one of claims 1 to 10;
an image carrier that carries a developer image;
A cartridge that can be attached to and detached from an apparatus main body of an image forming apparatus. at least one of the developing device according to any one of claims 1 to 10 or the cartridge according to claim 11;
a transfer member;
An image forming apparatus comprising: