Abstract: Provided is an image forming apparatus, having: a power source; a first coupling member configured to be rotated by a driving force transferred from the power source; and a cartridge including a second coupling member configured to rotate in a state of being adsorbed to the first coupling member, and a rotating member connected with the second coupling member, wherein the first coupling member has a first driving force transfer surface which is perpendicular to a rotation axis of the first coupling member, the second coupling member has a second driving force transfer surface which is perpendicular to a rotation axis of the second coupling member, and the driving force is transferred from the first coupling member to the second coupling member in a state where an adsorption force is generated mutually between the first driving force transfer surface and the second driving force transfer surface.

Abstract: A developer accommodating unit includes a developer container provided with an opening at a lower portion thereof with respect to a direction of gravitation in an attitude during use and configured to accommodate a developer; a developer carrying member mounted at the opening and configured to carry the developer; and a feeding member provided in the developer container and configured to feed the developer in the developer container toward the developer carrying member. The feeding member is swingable about a predetermined supporting point as a swing center and is configured so that maximum acceleration when the feeding member moves toward the developer carrying member is smaller than maximum acceleration when the feeding member moves away from the developer carrying member.

Abstract: A developer accommodating unit for accommodating a developer for image formation includes a flexible container provided with an opening 35a for permitting discharge of the developer, a frame for accommodating the flexible container and for accommodating the developer to be discharged from the flexible container, and an urging member 21 for urging a developer accommodating bag toward the frame for accommodating the developer accommodating bag 16. By this, it is possible to satisfactorily effect discharge of the developer from the flexible developer accommodating bag 16.

Abstract: Provided is an image forming apparatus, having: a power source; a first coupling member configured to be rotated by a driving force transferred from the power source; and a cartridge including a second coupling member configured to rotate in a state of being adsorbed to the first coupling member, and a rotating member connected with the second coupling member, wherein the first coupling member has a first driving force transfer surface which is perpendicular to a rotation axis of the first coupling member, the second coupling member has a second driving force transfer surface which is perpendicular to a rotation axis of the second coupling member, and the driving force is transferred from the first coupling member to the second coupling member in a state where an adsorption force is generated mutually between the first driving force transfer surface and the second driving force transfer surface.

Abstract: A developer accommodating unit includes a developer container provided with an opening at a lower portion thereof with respect to a direction of gravitation in an attitude during use and configured to accommodate a developer; a developer carrying member mounted at the opening and configured to carry the developer; and a feeding member provided in the developer container and configured to feed the developer in the developer container toward the developer carrying member. The feeding member is swingable about a predetermined supporting point as a swing center and is configured so that maximum acceleration when the feeding member moves toward the developer carrying member is smaller than maximum acceleration when the feeding member moves away from the developer carrying member.

Abstract: A developer accommodating unit for accommodating a developer for image formation includes a flexible container provided with an opening 35a for permitting discharge of the developer, a frame for accommodating the flexible container and for accommodating the developer to be discharged from the flexible container, and an urging member 21 for urging a developer accommodating bag toward the frame for accommodating the developer accommodating bag 16. By this, it is possible to satisfactorily effect discharge of the developer from the flexible developer accommodating bag 16.

Abstract: A developer accommodating member for accommodating a developer includes a flexible container provided with a single opening for permitting discharge of the developer, a sealing member bonded to a periphery of the opening and configured to seal the opening, a bonding portion bonding the periphery of the opening and the sealing member, and a reinforcing member. The container includes a fixing portion fixable in a neighborhood of the opening. The opening is formed so as to extend in a longitudinal direction of the container. The reinforcing member is provided on a side opposite from the fixing portion with respect to the opening, and as seen in a direction perpendicular to a plane including the opening. The bonding portion and the reinforcing member at least partially overlap with each other.

Abstract: A developer accommodating unit for accommodating a developer for image formation includes a flexible container provided with an opening 35a for permitting discharge of the developer, a frame for accommodating the flexible container and for accommodating the developer to be discharged from the flexible container, and an urging member 21 for urging a developer accommodating bag toward the frame for accommodating the developer accommodating bag 16. By this, it is possible to satisfactorily effect discharge of the developer from the flexible developer accommodating bag 16.

Abstract: A developer accommodating unit for accommodating a developer for image formation includes a flexible container provided with an opening 35a for permitting discharge of the developer, a frame for accommodating the flexible container and for accommodating the developer to be discharged from the flexible container, and an urging member 21 for urging a developer accommodating bag toward the frame for accommodating the developer accommodating bag 16. By this, it is possible to satisfactorily effect discharge of the developer from the flexible developer accommodating bag 16.

Abstract: A fixing portion 18c for suppressing movement of a developer bag 16 when the developer bag 16 is unsealed by moving a sealing member 19 is provided. By this, unsealing becomes easy.

Abstract: A fixing portion 18c for suppressing movement of a developer bag 16 when the developer bag 16 is unsealed by moving a sealing member 19 is provided. By this, unsealing becomes easy.

Abstract: A fixing portion 18c for suppressing movement of a developer bag 16 when the developer bag 16 is unsealed by moving a sealing member 19 is provided. By this, unsealing becomes easy.

Abstract: A developer accommodating unit for accommodating a developer for image formation includes a flexible container provided with an opening 35a for permitting discharge of the developer, a frame for accommodating the flexible container and for accommodating the developer to be discharged from the flexible container, and an urging member 21 for urging a developer accommodating bag toward the frame for accommodating the developer accommodating bag 16. By this, it is possible to satisfactorily effect discharge of the developer from the flexible developer accommodating bag 16.

Abstract: A developer accommodating unit for accommodating a developer for image formation includes a flexible container provided with an opening 35a for permitting discharge of the developer, a frame for accommodating the flexible container and for accommodating the developer to be discharged from the flexible container, and an urging member 21 for urging a developer accommodating bag toward the frame for accommodating the developer accommodating bag 16. By this, it is possible to satisfactorily effect discharge of the developer from the flexible developer accommodating bag 16.

Abstract: A developer accommodating unit for accommodating a developer for image formation includes a flexible container provided with an opening 35a for permitting discharge of the developer, a frame for accommodating the flexible container and for accommodating the developer to be discharged from the flexible container, and an urging member 21 for urging a developer accommodating bag toward the frame for accommodating the developer accommodating bag 16. By this, it is possible to satisfactorily effect discharge of the developer from the flexible developer accommodating bag 16.

Abstract: A fixing portion 18c for suppressing movement of a developer bag 16 when the developer bag 16 is unsealed by moving a sealing member 19 is provided. By this, unsealing becomes easy.

Abstract: A powder feeding mechanism includes: a feeding member, provided under powder, for feeding the powder; and a vibration applying member for applying reciprocating acceleration to the feeding member in a feeding surface direction along a powder feeding surface of the feeding member. Maximum acceleration applied from the vibration applying member to the feeding member in a powder feeding direction is smaller than maximum acceleration applied from the vibration applying member to the feeding member in a direction opposite to the powder feeding direction to feed the powder in the powder feeding direction by the feeding member.

Abstract: A developer accommodating unit for accommodating a developer for image formation includes a flexible container provided with an opening 35a for permitting discharge of the developer, a frame for accommodating the flexible container and for accommodating the developer to be discharged from the flexible container, and an urging member 21 for urging a developer accommodating bag toward the frame for accommodating the developer accommodating bag 16. By this, it is possible to satisfactorily effect discharge of the developer from the flexible developer accommodating bag 16.

Abstract: A fixing portion 18c for suppressing movement of a developer bag 16 when the developer bag 16 is unsealed by moving a sealing member 19 is provided. By this, unsealing becomes easy.

Abstract: A developer accommodating unit for accommodating a developer for image formation. A flexible container includes a developer accommodating portion for accommodating the developer and an opening for permitting discharge of the developer. The flexible container also includes a superposed multi layer sheet structure portion for forming the developer accommodating portion. A sealing member seals the opening and an unsealing member moves the sealing member to unseal the opening. A frame that accommodates the flexible container, the sealing member, and the unsealing member includes a fixing portion for fixing the flexible container. A fixed portion fixed to the fixing portion is provided at the superposed multi layer sheet structure portion of the flexible container, and an interlayer bonding portion between the superposed layers is provided between the fixed portion of the multi layer sheet structure portion and the developer accommodating portion.