A toner sealing system is described including a seal having first and second alignment features. The seal is selectably installable on one of a first toner container of a first type and a second toner container of a second type. The first alignment feature is matable with a first corresponding alignment feature on the first toner container when the seal is installed on the first toner container for aligning the seal to the first toner container. The second alignment feature is matable with a second corresponding alignment feature on the second toner container when the seal is installed on the second toner container for aligning the seal to the second toner container. Embodiments include those wherein the first alignment feature does not align the seal to the second toner container, and the second alignment feature does not align the seal to the first toner container.

A developing apparatus includes a sealing sheet to seal an opening portion in a developing container, an attaching portion provided on an accommodating chamber and to which the sealing sheet is attached, and a discharge portion through which the sealing sheet is discharged from inside of the developer container to outside of the developer container. The initial developer in the accommodating chamber moves to a second chamber through the opening portion by discharging the sealing sheet through the discharge portion from the inside of the developer container to the outside of the developer container. The discharge portion is disposed upstream from the opening portion and above the opening portion, and the discharge portion is disposed on a wall surface of the developer container intersected with a side wall of the developer container, the side wall having a through hole which a second conveyance screw penetrates.

A developing apparatus includes a first conveyance screw in a first chamber and a second conveyance screw in a second chamber, a developer accommodating portion disposed above the second conveyance screw, and an opening portion in the accommodating portion and through which the developer is supplied to the second chamber. In addition, a sealing sheet is attached to a sheet attaching portion and seals the opening portion, and a sheet discharge portion is disposed above the sheet attaching portion and discharges the sealing sheet to out of the developing apparatus. The sheet discharge portion is formed along a radial direction of the second conveyance screw in a cross section perpendicular to a rotation axis direction of the second conveyance screw.

A toner sealing system is described including a seal having first and second alignment features. The seal is selectably installable on one of a first toner container of a first type and a second toner container of a second type. The first alignment feature is matable with a first corresponding alignment feature on the first toner container when the seal is installed on the first toner container for aligning the seal to the first toner container. The second alignment feature is matable with a second corresponding alignment feature on the second toner container when the seal is installed on the second toner container for aligning the seal to the second toner container. Embodiments include those wherein the first alignment feature does not align the seal to the second toner container, and the second alignment feature does not align the seal to the first toner container.

A developing apparatus includes a developer conveyance member including a rotatably supported flexible sheet having a first distance between its rotation axis and an edge of the flexible sheet in a state where the flexible sheet is unbent. A lid of a developing container includes a corner portion that extends a storage space outward of an imaginary circle with a radius of the first distance centered on the rotational axis, and a contact portion which protrudes from an inner surface of the corner portion to an inner side of the imaginary circle and with which the flexible sheet contacts while the conveyance member is being rotated. The contact portion has a distal edge shaped such that a distance between the distal edge and the rotation axis increases toward a downstream side in a rotation direction of the conveyance member as viewed in the direction along the rotation axis.

A toner sealing system is described including a seal having first and second alignment features. The seal is selectably installable on one of a first toner container of a first type and a second toner container of a second type. The first alignment feature is matable with a first corresponding alignment feature on the first toner container when the seal is installed on the first toner container for aligning the seal to the first toner container. The second alignment feature is matable with a second corresponding alignment feature on the second toner container when the seal is installed on the second toner container for aligning the seal to the second toner container. Embodiments include those wherein the first alignment feature does not align the seal to the second toner container, and the second alignment feature does not align the seal to the first toner container.

A toner sealing system is described including a seal having first and second alignment features. The seal is selectably installable on one of a first toner container of a first type and a second toner container of a second type. The first alignment feature is matable with a first corresponding alignment feature on the first toner container when the seal is installed on the first toner container for aligning the seal to the first toner container. The second alignment feature is matable with a second corresponding alignment feature on the second toner container when the seal is installed on the second toner container for aligning the seal to the second toner container. Embodiments include those wherein the first alignment feature does not align the seal to the second toner container, and the second alignment feature does not align the seal to the first toner container.

A toner sealing system is described including a seal having first and second alignment features. The seal is selectably installable on one of a first toner container of a first type and a second toner container of a second type. The first alignment feature is matable with a first corresponding alignment feature on the first toner container when the seal is installed on the first toner container for aligning the seal to the first toner container. The second alignment feature is matable with a second corresponding alignment feature on the second toner container when the seal is installed on the second toner container for aligning the seal to the second toner container. Embodiments include those wherein the first alignment feature does not align the seal to the second toner container, and the second alignment feature does not align the seal to the first toner container.

A developing device includes first and second chambers, a developing roller, first and second mixers, and one or more removable seals. The developing roller is in the first chamber. The first mixer is in the first chamber and configured convey developer in a first direction along a rotational axis of the developing roller. The second chamber is connected to the first chamber via a first port and a second port that are spaced apart from each other in the first direction. The second mixer is in the second chamber and configured to convey developer in a second direction opposite to the first direction. The one or more removable seals cover the first and second ports. A developer is contained in one of the first or second chambers. A developer discharge port is provided on the other one of the first or second chambers.

A developing device includes first and second chambers, a developing roller, first and second mixers, and one or more removable seals. The developing roller is in the first chamber. The first mixer is in the first chamber and configured convey developer in a first direction along a rotational axis of the developing roller. The second chamber is connected to the first chamber via a first port and a second port that are spaced apart from each other in in the first direction. The second mixer is in the second chamber and configured to perform convey developer in a second direction opposite to the first direction. The one or more removable seals cover the first and second ports. A developer is contained in one of the first or second chambers. A developer discharge port is provided on the other one of the first or second chambers.