Patent application number | Description | Published |
20110170916 | DEVELOPING APPARATUS - A repulsive magnetic field is formed in a section immediately upstream of a regulating blade, so that generation of a developing-agent stationary layer is suppressed or eliminated. Accordingly, a developing apparatus capable of stably maintaining the layer thickness of developing agent conveyed to a developing area for a long time is provided. | 07-14-2011 |
20120251185 | DEVELOPING DEVICE - A developing device includes a developer carrying member for carrying a developer; a first feeding chamber for feeding along the developer carrying member to supply the developer to the developer carrying member and for collecting the developer, after being subjected to development; a second feeding chamber, connected to the first feeding chamber, for foaming a circulating path with the first feeding chamber; and a screw member rotatably provided in the first feeding chamber. In a region where the screw member opposes at least a developing region with respect to a rotational axis direction of the developer carrying member, the screw member includes a first helical portion having a helix direction of feeding the developer in the same direction as a circulation direction of the circulation path and a second helical portion having a helix direction opposite to the helix direction of the first helical portion. | 10-04-2012 |
20120269555 | DEVELOPING DEVICE - A developing device includes a developer carrying member for carrying a developer; a circulation path along which the developer is circulated; a carrier supplying portion; a discharge opening, provided in the circulation path, through which a portion of the developer is to be overflowed and discharged; and a feeding member comprising a rotation shaft and a blade portion including a helical portion. An outer diameter of the blade portion formed in a first region including at least a portion opposing the discharge opening is smaller than that in a second region adjacent to the first region with respect to a rotation shaft direction. A smaller average angle formed between the rotation shaft and a developer feeding surface of the blade portion in the first region is smaller than that in the second region. | 10-25-2012 |
20130287449 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device includes a developing sleeve, a magnet roller mounted in the developing sleeve, a first conveying screw feeding a developer to the developing sleeve, and a regulating blade regulating a layer thickness of the developer. The developing device further includes a guide member that backs up the developer from the first conveying screw at an upstream side of the regulating blade based on a rotational direction of the developing sleeve and that forms a buffer portion temporarily containing the developer between the regulating blade and the guide member. The guide member is installed so that a direction of a resultant force of a magnetic force and a gravitational force acting on a carrier particle becomes a direction away from a surface of the guide member on a facing surface of the guide member which is opposite to the regulating blade. | 10-31-2013 |
20150071683 | DEVELOPING DEVICE - A developing device includes: a developer carrying member; a first chamber; a second chamber; a partition wall; a communicating portion; and a feeding member, provided rotatably in the first chamber, for feeding the developer in the first chamber. In a circulation path, the feeding member includes a first region corresponding to a developer coating region of the developer carrying member and a second region, provided downstream of the first region with respect to a feeding direction of the feeding member, corresponding to a region outside the developer coating region of the developer carrying member. Feeding power per unit driving time of the feeding member is set at a smaller value in the first region than in the second region. | 03-12-2015 |
20150338777 | DEVELOPING APPARATUS AND IMAGE FORMING APPARATUS - (γ−1)×360×(x/p)−α(x)≠0 is satisfied of L | 11-26-2015 |
20150338778 | DEVELOPING DEVICE HAVING AN OVERFLOW DISCHARGING PORTION - A developing device includes: a developer carrying member; first and second feeding paths; a first screw member; a second screw member; and a discharge portion. When a ratio of a developer feeding speed in a first region to a developer feeding speed in the second region is α, a screw blade pitch of the first screw member in the second region is p | 11-26-2015 |
20150338780 | IMAGE FORMING APPARATUS - An image forming apparatus includes: a developer carrying member (sleeve) including a magnet and grooves; and an image bearing member (drum). The electrostatic image on the drum is developed with a developer. When a linear speed of the sleeve is Vs, a linear speed of the drum is Vd, a peripheral speed ratio of the sleeve to the drum is α=Vs/Vd, a radius of the sleeve is Rs, a radius of the drum is Rd, a distance of a rectilinear line connecting a most upstream point and a most downstream point in the developing region with respect to the circumferential direction is Lnip, a pitch of the grooves of the sleeve is p, and an arbitrary natural number is n, the following relationship is satisfied: | 11-26-2015 |