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.

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.

A developing apparatus includes a developing container to accommodate a developer and having first and second chambers divided by a partition wall for supplying the developer to a rotatable developing member and first and second communicating portions to allow the developer to move between first and second chambers by conveyance screws. A third communicating portion is disposed between the first and second communicating portions and above the conveyance screws to allow air inside the developing container to move between the first chamber and the second chamber. The developing container further includes a third chamber disposed above the second chamber in the vertical direction and accommodates initial developer in an unused state of the developing apparatus, and an opening portion for discharging the air inside the developing container to outside of the developing container is provided in the third chamber, with the opening being disposed above the third chamber.

An operation guide label is made to perform a display urging a seal member for sealing a toner replenishment port of a toner container received in an image forming apparatus to be pulled out. The image forming apparatus has a first side surface provided with a power switch and a second side surface adjacent to the first side surface and provided with an opening and closing cover for toner container exchange. The seal member has a grasping part which protrudes from a surface of the toner container. The operation guide label includes a first label part adhered to the first side surface so as to cover at least a part of the power switch, a second label part adhered to a predetermined surface part on the side of the opening and closing cover in the image forming apparatus, and a connection part for connecting the both label.

An image forming apparatus includes a cover, a cooperating member, a switching member, a detector, and a controller. The cover opens and closes an aperture in a main body of the image forming apparatus. The cooperating member moves to an activated position when the cover is opened for the first time. The activated position is a position where the cooperating member is enabled to cooperate with the cover. The switching member moves in cooperation with the cover through the cooperating member in the activated position as the cover is opened and closed. The detector detects an open state or a closed state of the cover according to the movement of the switching member. The controller determines that image formation is enabled when the detector has detected the closed state of the cover.

An image forming apparatus is provided which can reduce occurrence of unusual noise. The image forming apparatus includes a driving motor configured to drive a developer bearing member and a control unit which can control the driving motor between a first driving speed and a second driving speed higher than the first driving speed. In a case where the first driving speed is equal to the driving speed of the image forming operation, the control unit controls the driving motor to drive at the second driving speed while an unsealing operation is being performed.

A developer cartridge includes a developer container, a casing, a sealing member, and a drive input. The developer container is configured to sealingly contain developer therein. The developer container has an outlet through which the developer flows out of the developer container. The casing is configured to accommodate the developer container therein. The casing supports the developer container to allow the developer container to rotate about an axis thereof in a rotating direction. The sealing member is configured to seal the outlet. The drive input is configured to transmit rotational driving force to the developer container. The sealing member is fixed to the casing.

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.

Provided is a developer container, including: a frame body having an opening; a sealing member configured to seal the opening; an unsealing member configured to unseal the opening by moving the sealing member and accommodated inside the frame body; and a part of the sealing member peelably bonded to an outer peripheral edge of the opening on an opposite side of the unsealing member with respect to the opening.

This invention provides a developing apparatus including: first and second chambers containing developer and configured to form a circulation path of the developer; a first feeding member arranged in the first chamber and feeding the developer in a first direction; a second feeding member arranged in the second chamber and feeding the developer in a second direction opposite to the first direction; first and second communication parts through which the developer is transferred; a feeding path having a discharging port and communicating with the first chamber on a downstream side relative to the first communication part in the first direction to feed the developer toward the discharging port; a sealing part sealing the developer; a feeding path sealing part sealing the feeding path on an upstream side relative to the discharging port in the first direction; and an unsealing mechanism receiving a driving force and unsealing the sealing part.