Abstract: A charging device includes a discharge electrode that extends along a rotational axis direction of a member to be charged that rotates and has an arc-shaped outer peripheral surface, the discharge electrode being arranged to face the outer peripheral surface; a potential control plate arranged between the outer peripheral surface of the member to be charged and the discharge electrode and extending in the rotational axis direction of the member to be charged, the potential control plate being plastically deformed so as to independently maintain the shape of the potential control plate; and a support member that supports the potential control plate only at both end portions of the potential control plate in a long-side direction of the potential control plate.

Abstract: A charging device includes a discharge electrode that extends along a rotational axis direction of a member to be charged that rotates and has an arc-shaped outer peripheral surface, the discharge electrode being arranged to face the outer peripheral surface; a potential control plate arranged between the outer peripheral surface of the member to be charged and the discharge electrode and extending in the rotational axis direction of the member to be charged, the potential control plate being plastically deformed so as to independently maintain the shape of the potential control plate; and a support member that supports the potential control plate only at both end portions of the potential control plate in a long-side direction of the potential control plate.

Abstract: A developer vessel having: a developing agent, a second developing agent holding chamber that holds the developing agent supplied to the developing agent supporter; a first developing agent holding chamber being adjacent to the second developing agent holding chamber; a first partition that divides the first and the second developing agent holding chambers and having a second and a third opening portion; a first and a second carrying member that cause the developing agent to circulate between the first and the second developing agent holding chambers via the opening portions; a toner holding chamber being adjacent to the first developing agent holding chamber and facing the second developing agent holding chamber, and holds the toner supplied to the first developing agent holding chamber; and a second partition that has a first opening portion and divides the first developing agent holding chamber and the toner holding chamber.

Abstract: A developing unit which includes a conveying shaft; a developing conveying portion conveying a developer in an axial direction as the conveying shaft rotates; a discharge opening discharging the developer from the inner wall surface; an accumulating chamber accumulating the discharged developer; and an opening/closing member opening and closing the discharge opening due to its own weight as the rotating body rotates, and being in an open state at the developing position, an opening/closing fulcrum of the opening/closing member being at a lower end portion of the opening/closing member at the developing position, the developing unit being held at a rotating body, and successively being made to oppose a developing position of an image carrier due to rotation of the rotating body.

Abstract: A developer vessel having: a developing agent, a second developing agent holding chamber that holds the developing agent supplied to the developing agent supporter; a first developing agent holding chamber being adjacent to the second developing agent holding chamber; a first partition that divides the first and the second developing agent holding chambers and having a second and a third opening portion; a first and a second carrying member that cause the developing agent to circulate between the first and the second developing agent holding chambers via the opening portions; a toner holding chamber being adjacent to the first developing agent holding chamber and facing the second developing agent holding chamber, and holds the toner supplied to the first developing agent holding chamber; and a second partition that has a first opening portion and divides the first developing agent holding chamber and the toner holding chamber.

Abstract: A developing unit, comprises: a conveying shaft; a developing conveying portion conveying a developer in an axial direction as the conveying shaft rotates; a discharge opening discharging the developer from the inner wall surface; an accumulating chamber accumulating the discharged developer; and an opening/closing member opening and closing the discharge opening due to its own weight as the rotating body rotates, and being in an open state at the developing position, an opening/closing fulcrum of the opening/closing member being at a lower end portion of the opening/closing member at the developing position, the developing unit being held at a rotating body, and successively being made to oppose a developing position of an image carrier due to rotation of the rotating body.

Abstract: A developing device, which has a developer carrying member forming a magnetic brush of a two-component developer and is capable of carrying out a development while it is not in contact with an electrostatic latent image retaining member, is improved so as to reproduce an image at a sufficient image density.

Abstract: A developing apparatus for developing a latent image on a surface of a photosensitive body by forming a toner cloud in a developing region through electrode wire, in which movably supporting units for supporting electrode supporting unit movably between operative positions and inoperative positions are provided so that the electrode wire supported by the electrode supporting units can be kept in an operative position near to a surface of a developing roll when the electrode supporting units are in their operative positions and, on the other hand, the electrode wire can be kept in an inoperative position far from the surface of the developing roll when the electrode supporting units are in their inoperative positions. Thereby, foreign matters trapped in the electrode wire or accumulated on the electrode wire can be removed easily.