An image recording apparatus has a photoconductive drum and a roller, e.g., developing roller, in pressure contact with the photoconductive drum. The photoconductive drum rotates on its rotational axis and has drum gears rotatable about the rotational axis. The drum gears are at opposite ends of the rotational axis. The roller is in pressure contact with the photoconductive drum and rotates on its rotational axis substantially parallel with the rotational axis of the photoconductive drum. The roller has roller gears rotatable about its rotational axis. The roller gears are at opposite ends of the rotational axis and in mesh with the drum gears. At least one of the roller gears is provided with a one-way clutch which is locked only when a drive force is applied to the roller gear.
A developer-driving device and an image forming apparatus having the same are provided. The developer-driving device includes a photosensitive drum-driving unit that rotates a photosensitive drum and a developing roller-driving unit that rotates a developing roller. Each of the photosensitive drum-driving unit and the developing roller-driving unit includes a one-way power transmission unit. The one-way power transmission unit idles when a developer is being mounted on a main body and transmits power to the photosensitive drum and the developing roller after the developer is mounted on the main body.
A driving device, an image forming device, and an image forming apparatus are disclosed. In at least one embodiment, the image forming device includes a first rotator and a second rotator, which are arranged in parallel with each other. The driving device rotates the first rotator with a rotational speed different from a rotational speed of the second rotator.
6285847 - Printer - Owned by Matsushita Electric Industrial Co., Ltd. (Osaka,JP)
A printer for forming a toner image to be transferred onto a work piece, includes a latent image roller with an outer peripheral image surface adapted to be electrified in such a manner that an electrostatic latent image is formed thereon, an image developing roller with an outer peripheral toner surface adapted to hold thereon toner to be supplied onto the outer peripheral image surface so that the electrostatic latent image is developed by the toner to form the toner image, an electrifier for electrifying the outer peripheral image surface, and a discharger for partially electrically discharging the electrified outer peripheral image surface to form the electrostatic latent image. A motor drives both the latent image roller and the image developing roller.
An image forming apparatus includes a unit including at least two rotary members, and an apparatus main body configured to detachably mount the unit. The apparatus main body includes a first rotation drive source, drive rotary members corresponding to the at least two rotary members and engaging with the at least two rotary members, directly or indirectly, to rotate the at least two rotary members, respectively, and a drive force transmission mechanism transmitting a drive force of the first rotation drive source to the drive rotary members.
An electrophotographic photosensitive drum for use in a main body of an electrophotographic image forming apparatus, includes a cylinder having a photosensitive member on the periphery, a first helical gear provided at one end of the cylinder, and a second helical gear provided at the other end of the cylinder and having the same hand helix as the first helical gear and a number of teeth less than that of the first helical gear.
