A developing device includes a developer container including first and second chambers between which the developer is circulated, first and communication portions to permit the developer to communicate with the first and second chambers, first and second screws provided in the first and second chambers, respectively, and a developer discharging portion. The developer discharging portion is provided in a passage continuous with the first chamber of an upstream of the second communication portion. In the developing device, a discharging method includes a step for inserting a shield member into the second communication portion via an inserting opening of the developer container, and a step for discharging the developer from the developing device via the developer discharging portion, by rotating the first and second screws in a direction opposite to a direction of rotating during a developing operation in a state where the shielding member is inserted into the second communication portion in the inserting step.

A developing device includes a developer container including first and second chambers between which the developer is circulated, first and communication portions to permit the developer to communicate with the first and second chambers, first and second screws provided in the first and second chambers, respectively, and a developer discharging portion. The developer discharging portion is provided in a passage continuous with the first chamber of a downstream of the first communication portion. In the developing device, a discharging method includes a step for inserting a shield member into the second communication portion via an inserting opening of the developer container, and a step for discharging the developer from the developing device via the developer discharging portion, by rotating the first and second screws in a direction same as a direction of rotating during a developing operation in a state where the shielding member is inserted into the second communication portion in the inserting step.

A developing device includes a developer cartridge and a developing unit. The developer cartridge, in some instances, may include a shutter. This shutter may have a wall for closing a developer supply hole, and be movable, with respect to a developer cartridge casing, between an open position where the supply hole is opened by the wall and a closed position where the supply hole is closed by the wall. The shutter may further include a protrusion that is movable with respect to the wall of the shutter between a first position and a second position in an axial direction. The protrusion, in the first position, is engageable with a developing unit and, in the second position, would be disengaged from the developing unit.

A developer discharging method includes inserting a shielding member into a second communication portion via an inserting opening of a developer container to shift the second communication portion from an opening state for opening the second communication portion to a shielding state for shielding the second communication portion, and discharging the developer from a developing device via a developer discharging portion by rotatably driving a first conveying screw in a direction opposite to a direction of rotatably driving the first conveying screw during a developing operation of developing an electrostatic image formed on an image bearing member when the shielding member is inserted into the second communication portion and by rotatably driving the second conveying screw in a direction opposite to a direction of rotatably driving the second conveying screw during the developing operation when the shielding member is inserted into the second communication portion.

An imaging system comprises a stirring-conveyance member to supply developer to a developing roller. The stirring-conveyance member includes a spiral structure to convey the developer and a reverse spiral structure disposed downstream the spiral structure in a conveying direction of the developer. The reverse spiral structure has a maximum outer diameter at an upstream end in the conveying direction and a minimum outer diameter at a downstream end in the conveying direction. The minimum outer diameter is approximately ⅗ or less, of the maximum outer diameter.

A toner collection device includes a casing, a fan unit and a filter. The casing has a suction port and an exhaust port. The fan unit is supported by the casing in a swingable manner and generates an air flow from the suction port to the exhaust port inside the casing. The filter is disposed inside the casing and supported by the casing or the fan unit, and collects a toner contained in the air flow flowed into the casing through the suction port. When the fan unit is driven to generate the air flow, a swinging of the fan unit is transmitted to the filter to vibrate the filter.

Examples disclosed herein relate to magnetic carrier bead separation in dual-component printing. The present disclosure relates generally to a device, method, and system for magnetic carrier bead separation. In an example, a printing device includes a developer sump to hold a plurality of carrier beads. The example device also includes a roller to move a subset of the plurality of carrier beads from an attachment point on the roller to a release point through a rotation of the roller, wherein the subset of the plurality of carrier beads return towards the developer sump after they are released at the release point. The device includes a magnetic separator located between the release point and the attachment point that guides a magnetized carrier bead of the plurality of carrier beads away from the developer sump and the roller.

The developing device includes a developing roller, a developer conveying unit, a developer discharge unit, and an air discharge port. The developer conveying unit includes a developing chamber provided with the developing roller and extending in a longitudinal direction of the developing roller, a stirring chamber arranged in parallel to the developing chamber, and a barrier wall having a first communication port and a second communication port, at respective ends in the longitudinal direction, to connect the developing chamber with the stirring chamber. The developer discharge unit extends from the developer conveying unit in the longitudinal direction of the developing roller and includes a developer discharge port to discharge excess developer. The air discharge port is to house a filter to filter a developer, the air discharge port being provided between the developer conveying unit and the developer discharge unit to discharge air in the developer conveying unit.

An imaging system includes a developing roller connected to a supply channel to supply a developing agent and to transfer toner in the developing agent to a photosensitive drum at a supply position, a regulation member located adjacent to the developing roller at an upstream side of the supply position to restrict a thickness of the developing agent; and a casing that forms a release chamber in the periphery of the developing roller between an upstream side of the regulation member and a downstream side of the supply position. The release chamber includes an outlet to discharge scattered toner to an inlet of the supply channel.

A developing device includes a first conveyance screw including a first blade portion and a second blade portion, the first blade portion configured to convey the developer in a first direction, the second blade portion being disposed downstream of the first blade portion in the first direction and configured to convey the developer in a second direction, a discharge path through which the developer passes to be discharged through a discharge port, and a magnet. The first conveyance screw includes a third blade portion disposed in the discharge path and configured to convey the developer in the first direction. The discharge port is disposed downstream of an upstream end of the third blade portion in the first direction. The magnet is disposed downstream of an upstream end of the discharge port in the first direction so as to overlap with the discharge port in the first direction.