Abstract: A developing apparatus used in an image forming apparatus, including: a developer carrying member configured to carry a developer; and a control member configured to control the amount of a developer carried on the developer carrying member, wherein the control member is manufactured by cutting a supporting member covered with a covering member in a cutting direction intersecting a surface of the supporting member so as to be a predetermined length in the longitudinal direction thereof, and the covering member provided on the upstream side of the control member in the cutting direction comes into contact with the developer carrying member.

Abstract: An image forming apparatus includes a control unit controlling first and second voltage application mechanisms and shifting a difference Vdif (=Vrs?Vdr) between Vrs and Vdr toward polarity opposite to normal charge polarity of a developer as S decreases, where S is an absolute value of a speed difference between a circumferential speed of an image bearing member, which rotates while bearing an electrostatic latent image and a circumferential speed of a developer bearing member, which rotates at a constant circumferential speed ratio with respect to the image bearing member to develop the electrostatic latent image while bearing the developer, Vdr is a voltage that the first voltage application mechanism applies to the developer bearing member, and Vrs is a voltage that the second voltage application mechanism applies to the developer supply member.

Abstract: A developing device configured to develop a latent image formed on an image bearing member includes a rotatable developing-agent bearing member configured to bear developing agent, a developing container configured to form a developing-agent storage chamber that stores the developing agent, a developing-agent regulating portion provided in the developing container to regulate an amount of the developing agent born on the developing-agent bearing member, a support portion configured to support the developing-agent bearing member movably relative to the developing-agent regulating portion, and a pressurizing member configured to pressurize the developing-agent bearing member toward the developing-agent regulating portion. A contact portion of the developing-agent regulating portion with the developing-agent bearing member is fixed to the developing container without forming a gap from the developing container on a downstream side in a pressurizing direction of the pressurizing member.

Abstract: An image forming apparatus includes a control unit controlling first and second voltage application mechanisms and shifting a difference Vdif (=Vrs?Vdr) between Vrs and Vdr toward polarity opposite to normal charge polarity of a developer as S decreases, where S is an absolute value of a speed difference between a circumferential speed of an image bearing member, which rotates while bearing an electrostatic latent image and a circumferential speed of a developer bearing member, which rotates at a constant circumferential speed ratio with respect to the image bearing member to develop the electrostatic latent image while bearing the developer, Vdr is a voltage that the first voltage application mechanism applies to the developer bearing member, and Vrs is a voltage that the second voltage application mechanism applies to the developer supply member.

Abstract: A developing apparatus includes a developing container for accommodating the developer; a sleeve for carrying the developer to developing zone for developing a latent image; a developer regulator contacted to the sleeve to regulate a developer layer thickness on the sleeve; a developer feeding member contacted to the sleeve supply the developer to the sleeve; an urging member for urging the sleeve toward the developer regulator; and a moving mechanism for moving the sleeve in a first direction which is a direction in which the urging member urges the sleeve and in a second direction crossing with the first direction. The moving mechanism moves the sleeve in the second direction to reduce or remove press-contact forces applied by the developer regulator and the developer feeding member.

Abstract: A developing roller configured to develop an electrostatic latent image on a photosensitive drum, a supply roller configured to supply developer to the developing roller are provided, and the surface of the developing roller moves in the same direction as the surface of the photosensitive drum and at a speed higher than the photosensitive drum at a nip portion between the photosensitive drum and the developing roller, the surface of the supply roller moves in the same direction as the surface of the developing roller and at a speed higher than the developing roller at a nip portion between the developing roller and the supply roller.

Abstract: An electrophotographic image forming apparatus, including: an electrophotographic photosensitive member; a developer carrying member configured to carry developer to develop a latent image on the photosensitive member in contact with the photosensitive member; and a developer feed member configured to feed the developer to the carrying member in contact with the carrying member, wherein the photosensitive member and the carrying member are separated from each other during non-image formation and brought into contact with each other after the photosensitive member and the carrying member start to be rotated, and wherein, during a time period between a time when the photosensitive member and the carrying member start to be rotated and a time when the photosensitive member and the carrying member are brought into contact with each other, a number of revolutions of the feed member is larger than a number of revolutions of the carrying member.

Abstract: In a development device in which a developer containing unit underlies a development chamber, a supplying member in the development chamber forms a nip portion with a developer carrier and the developer carrier and the supplying member rotate in the direction in which their respective surfaces move from an upper end to a lower end of the nip portion.

Abstract: A developing device including a containing unit configured to be arranged below a supply member and contain a developer and a developer bearing member configured to bear the developer and develop an electrostatic latent image, further includes a supply member which is configured to supply the developer to the developer bearing member, to be arranged to form a nip portion between the supply member and the developer bearing member, and to rotate in a direction in which its surface moves from an upper end to a lower end of the nip portion, and a conveyance member which is configured to convey the developer contained in the containing unit onto the supply member.

Abstract: A developing apparatus, including: a developer carrying member; a developer feeding member configured to feed the developer to the developer carrying member in abutment with the developer carrying member; and a developer regulating member having a distal end portion directed toward an upstream side in a rotation direction of the developer carrying member, and configured to regulate a layer thickness of the developer on the developer carrying member in abutment with a surface thereof. Surfaces of the developer carrying member and the developer feeding member move in the same direction in an abutment portion. The distal end portion of the developer regulating member has a developer taking-in portion away from the surface of the developer carrying member toward the upstream side in the rotation direction. The developer taking-in portion is positioned upstream of an abutment position between the developer regulating member and the developer carrying member.

Abstract: A developing apparatus used in an image forming apparatus, including: a developer carrying member configured to carry a developer; and a control member configured to control the amount of a developer carried on the developer carrying member, wherein the control member is manufactured by cutting a supporting member covered with a covering member in a cutting direction intersecting a surface of the supporting member so as to be a predetermined length in the longitudinal direction thereof, and the covering member provided on the upstream side of the control member in the cutting direction comes into contact with the developer carrying member.