A developing device according to an embodiment includes a housing, a developing roller, a gap forming member, and a guide section. The gap forming member forms a first gap between the gap forming member and the developing roller. The gap forming member forms a second gap between the gap forming member and the housing. The second gap includes an upstream side opening on a rotating direction upstream side of the developing roller. The guide section directs an air current discharged from the second gap via the upstream side opening to the first gap. A relation of H1/H2<5 is satisfied, where H1 is a minimum interval between the developing roller and the gap forming member in the first gap and H2 is a minimum interval between the housing and the gap forming member in the second gap when viewed from an axial direction of the developing roller.

A developing device includes a housing including a development opening and a containing unit that contains a developer, a developer carrier that rotates to pass through the development opening while holding the developer in the containing unit of the housing, an inlet portion of a flow path located in the housing at a portion including a downstream edge portion of the development opening on a downstream side in a rotation direction of the developer carrier, the inlet portion taking in part of an airflow caused by a rotation of the developer carrier to allow the part of the airflow to flow over an outer surface of the housing, and a guide member extending toward the developer carrier from a portion of the housing on a side of the inlet portion opposite to the development opening to guide the part of the airflow to the inlet portion.

The present disclosure provides a developer container including a developer supplying box and a developer containing box. A first gear is rotatably connected to the developer supplying box, and a rotating shaft is inserted into the first gear; first stirring blades are fixed to two sides of the rotating shaft, and a second stirring blade is fixed at the rotating shaft; a first sliding cover is sleeved on the developer supplying box, and a sliding cover powder outlet is disposed on the first sliding cover; a supply box powder outlet is disposed on the developer supplying box; the first gear is engaged with a second gear, the second gear is engaged with a third gear, the third gear is engaged with a fourth gear, and the fourth gear is engaged with a fifth gear; and a screw feeding rod is inserting into the fifth gear.

A developing device according to an embodiment includes a housing, a developing roller, a gap forming member, and a guide section. The gap forming member forms a first gap between the gap forming member and the developing roller. The gap forming member forms a second gap between the gap forming member and the housing. The second gap includes an upstream side opening on a rotating direction upstream side of the developing roller. The guide section directs an air current discharged from the second gap via the upstream side opening to the first gap. A relation of H1/H2<5 is satisfied, where H1 is a minimum interval between the developing roller and the gap forming member in the first gap and H2 is a minimum interval between the housing and the gap forming member in the second gap when viewed from an axial direction of the developing roller.

A binary ink developer (BID) assembly for a liquid electrophotography (LEP) printing device can include a developer roller having an electrically insulating exterior coating that receives ink from an ink supply and transfers the received ink to a photoconductive imaging cylinder in accordance with an electrostatic image on the imaging cylinder. A charge-specified boundary condition can exist at the boundary between the exterior coating and the ink. Electrically conductive ink may not be transferred to the imaging cylinder at background portions of the electrostatic image.

An image forming apparatus includes a developer, a development device, and an image bearing member. The developer includes an initial developer containing an initial carrier and a replenishment developer containing a replenishment carrier. The initial carrier has a surface roughness Sa1 of at least 0.3 ?m and no greater than 1.0 ?m. A ratio Sa1/Sa2 of the surface roughness Sa1 of the initial carrier to a surface roughness Sa2 of the replenishment carrier is at least 1.2 and no greater than 3.4. The packing volume Vp calculated from equation (1)Vp=100?Y/(Z?DS) was at least 40% and no greater than 70%. In equation (1), Y represents an amount of the developer conveyed by a developer bearing member. Z represents an apparent density of the initial developer. DS represents a width of a space between the developer bearing member and the image bearing member.

A binary ink developer (BID) assembly for a liquid electrophotography (LEP) printing device can include a developer roller having an electrically insulating exterior coating that receives ink from an ink supply and transfers the received ink to a photoconductive imaging cylinder in accordance with an electrostatic image on the imaging cylinder. A charge-specified boundary condition can exist at the boundary between the exterior coating and the ink. Electrically conductive ink may not be transferred to the imaging cylinder at background portions of the electrostatic image.

An image forming apparatus includes: an apparatus body; a body cover: photoreceptor drums; developing devices; toner containers; container covers; lock release mechanisms; pressing units; latching parts; and interlocking mechanisms. Each of the plurality of pressing units presses the toner container toward the container cover within the apparatus body. Each of the plurality of latching parts latches the toner container against pressing force of the pressing unit at a replenishment position where the toner is replenishable to the developing device within the apparatus body. Each of the plurality of interlocking mechanisms moves the toner container from the replenishment position to a side of the container cover by the pressing force of the pressing unit by releasing the latch of the latching part to the toner container in conjunction with lock release of the container cover by the lock release mechanism.

A developing device includes a developer bearing member, a developer container, a regulating blade including a plate-like elastic portion, and an elastic seal sealing, and a pressing member pressing the elastic seal, wherein the plate-like elastic portion includes a metal plate, a second projection projecting from a second surface of the metal plate facing the developer bearing member, and a first projection projecting from a first surface opposite to the second surface of the metal plate, and wherein a projecting amount of the first projection is greater than a projecting amount of the second projection, wherein a top surface of the second projection contacts the surface of the developer bearing member, and an end surface of the first projection contacts an end surface of the elastic seal in the rotation axis direction.

The present disclosure relates to an electroconductive roller for an electrophotographic printer. The roller comprises a polyurethane composition containing a polyurethane and an ionic liquid. The cation of the ionic liquid is an organic cation. The polyurethane composition has a specific resistivity of 110.sup.5 .Math.cm to 110.sup.8 .Math.cm.