Abstract: The image forming apparatus has an image bearing member, and a developer carrying member which carries a developer to develop an electrostatic image formed on the image bearing member with the developer. In the image forming apparatus, a time period during which a peripheral velocity of the developer carrying member is lower than that during a development period is set in a non-development period.

Abstract: A driving means 6 is placed below a photoconductor drum 2. The driving means 6 includes first to fourth developing rollers 13A-13D and toner storage chambers 11A-11D. The developing means 6 can be shifted by a developing-device moving motor 9 to bring one of the developing rollers 13A-13D which corresponds to one of liquid toners 12A-12D to be developed in close to the photoconductor drum 2, followed by developing a latent image formed by an exposure. At this time, the distance between one of the developing rollers 13A-13D and the photoconductor drum 2 can be appropriately adjusted. In addition, before the development, meniscus of the liquid toner is quickly formed between the developing rollers 13A-13D and the photoconductor drum 2 by rotating the development rollers 13A-13 at the rotation speed higher than the rotation speed thereof at the development.

Abstract: An image forming apparatus is capable of improving throughput, preventing deterioration of developer and preventing shortening of the life of a developing apparatus. In the image forming apparatus, an image holding member holds an electrostatic latent image and a developer carrier carries developer to a developing portion, and a speed ratio between the image holding member and the developer carrier varies according to an image ratio.

Abstract: An image forming apparatus having a developer bearing member for bearing and transporting a developer to enable development of a latent image formed on an image bearing member, a regulating member for regulating the thickness of a layer of the developer borne on the developer bearing member, and a fixing device for fixing a developer image on a recording medium transferred from the image bearing member. One of a first mode in which a developer image is formed only on one side of a recording medium and a second mode in which developer images are formed on two sides of a recording medium can be selected. The image forming apparatus also has a controller for controlling the peripheral speed of the developer bearing member according to the selected mode.

Abstract: A developing apparatus includes: a first rotary member; a second rotary member having an elastic surface and adapted to be rotated in contact with the first rotary member. A contact depth controlling roller is kept in rotative free engagement with each end of a shaft of the second rotary member and having an outer circumferential surface abutting against the first rotary member and an inner circumferential surface abutting against the shaft of the second rotary member for keeping a contact depth of the second rotary member abutting against the first rotary member at a predetermined level. A controller is provided so as to rotate the second rotary. This structure, for example, eliminates the need for bearings.

Abstract: A developing apparatus comprises a development housing containing developer and disposed opposite to a carrier for carrying a latent image, and a developing roller rotatably provided in the development housing and rotatively driven in a predetermined direction. The developer in the development housing is carried by the developing roller and the developer carried by the developing roller is applied to the carrier through an opening formed in the development housing. A rotation speed F.beta. of the developing roller is higher than a movement speed F.alpha. of the carrier. A gap .beta. between an opening downstream side wall portion of the development housing and the developing roller is greater than a gap .alpha. between the opening downstream side wall portion and the carrier.

Abstract: A developing device for developing a latent image electrostatically formed on an image carrier includes an endless developing belt, and an applicator roller for applying a viscous developing liquid consisting of a dielectric carrier liquid and toner dispersed in the carrier liquid to the developing belt in the form of a thin layer. The developing liquid is transferred from the developing belt to the image carrier for developing the latent image. The applicator roller holds a preselected amount of the developing liquid thereon, contacts a portion of the developing belt not pressed from the rear side, and rotates in a direction opposite to a direction in which the developing belt moves. The device is therefore capable of uniformly applying the developing liquid to the developing belt and thereby improving image quality.

Abstract: A developing device is provided with: a developing roller for performing an electro-photography on a photosensitive body by using charged toners; a supplying roller for supplying the toners to the developing roller, the supplying roller being pushed against the developing roller so that an outer circumference of the supplying roller be deformed in a radius direction of the supplying roller; and a rotating device for rotating the supplying roller and the developing roller in directions opposite to each other at a contact portion between the supplying roller and the developing roller so that the toners be supplied from the supplying roller to the developing roller. A deformation amount in the radial direction of the supplying roller is not less than 0.5 mm, and a value of dividing an absolute value of a line speed on an outermost circumference of the supplying roller by an absolute value of a line speed on an outermost circumference of the developing roller is less than 0.

Abstract: The developing unit of an electrostatic printer is designed to avoid under-development of the bottom part of a dark latent image due to a reduction in recycled toner. This can be accomplished by providing the developing unit with one developing roller and at least two supply rollers. Alternatively, the developing unit has just one supply roller, but the rate at which toner is transferred from the supply roller to the developing roller can be switched. As another alternative, the supply roller and developing roller are designed to turn slowly enough that development of an entire page is completely developed before reaching the point where under-development would begin.

Abstract: An image forming device for forming images on a sheet transported along a sheet-transport pathway from a sheet supply tray to a sheet discharge unit includes a photo-sensitive drum rotated in a predetermined rotational direction at a predetermined peripheral speed, the photosensitive drum having a peripheral surface capable of forming a latent static electric image; and a developing roller disposed in confrontation with the photosensitive drum and for developing a latent static electric image formed on the peripheral surface of the photosensitive drum into a toner image, the developing roller being rotated in the rotational direction at a peripheral speed not more than two times the predetermined peripheral speed.

Abstract: A developer in use with an image forming apparatus. The developer includes: a developing sleeve which rotates and holds toner on itself so as to develop a latent image on a photoreceptor with the toner; a driving motor for generating a rotational driving force; a drive transmission for transmitting the rotational driving force of the driving motor to the developing cartridge in which the drive transmission has a transmitting state and an untransmitting state; and a shock easing controller or member for easing a shock of transmission of the rotational driving force to the developing sleeve in the transmitting state, in which the shock easing controller or member is provided in at least one of the driving means and the drive transmission means.

Abstract: An image forming device including a photosensitive drum having a first motor disposed to rotate the photosensitive drum at a speed Vp; an optical unit disposed to create a charged pattern corresponding to an original image on the photosensitive drum; a revolver developing device disposed to apply developer to the photosensitive drum to create a visible image on the photosensitive drum, the revolver developing device including a second motor disposed to rotate the revolver developing device at a speed Vr, a plurality of developing devices each having a developing roller for carrying developer, and a third motor disposed to rotate the developing roller of each developing device at a speed Vs, wherein Vr+Vs-Vp.noteq.

Abstract: An image forming apparatus including an image transport member driven to rotate with a latent image formed on a surface thereof, and a toner transport member driven to rotate with toner attached thereto for developing the latent image and in contact with the image transport member to transport the toner to the image transport member. The image forming apparatus further includes a toner layer thickness regulating member disposed in pressure contact with the surface of the toner transport member to regulate the thickness of a layer of toner transported in a state of being attached to the surface of the toner transport member. The amount of charge of the toner on the surface of the toner transport member is regulated in the range of from -16 .mu.C/g to -19 .mu.C/g.