Abstract:
An image-forming device includes photosensitive drums, a drum gear, a drum gear rotating body, a drum drive gear, and a drum drive gear rotating body. The drum gear is provided on an axial end of each photosensitive drum. The drum gear rotating body is provided adjacent to the drum gear for rotating together with the drum gear. The drum drive gear is engaged with the drum gear and has the same number of gear teeth as the drum gear. The drum drive gear rotating body is provided adjacent to the drum drive gear at a position corresponding to the drum gear rotating body for rotating together with the drum drive gear. A protrusion is provided on a peripheral edge of the drum gear rotating body, and a depression is formed on a peripheral edge of the drum drive gear rotating body. The phase of the drum gear and the phase of the drum drive gear are aligned when the protrusion is fitted into the depression.
Abstract:
A developing cartridge has a housing that accommodates developer therein. Rotatably mounted in the housing is a developing roller. The housing has side seals provided at each end of the developing roller that oppose the circumferential ends of the developing roller. The developing roller itself is divided into a seal region, a side-end region and a center region. A portion of the seal region and the side-end region found at each end of the developing roller with the seal region portions being at the ends of the roller and the side end region portions being between the seal region portions and the center region. Opposing the developing roller is a toner thickness regulating blade having a presser portion. The presser portion has a discontinuous cross-section such that a greater portion of the presser member contacts the developer roller in each portion of the side-end region then contacts the developer roller in the center region. As a result, a greater pressure is applied between the presser portion and the developer roller at the side-end region thereby resulting in less toner being applied to the developing roller to be carried to a photosensitive member. To further the minimize the amount of toner applied to the developing roller, the roughness in the side end region of the developing roller is smaller than the roughness in the center region and the hardness in the side end region of the developing roller is greater than the hardness in the center region. This combination of factors prevents toner from leaking from the housing at the ends of the developing rollers.
Abstract:
Even with an extend use of a laser printer, toner leakage can be prevented. A side seal disposed at each end of a developing roller includes a sealing member that makes sliding contact with a surface of the developing roller and a sponge seal that supports the sealing member. The sponge seal includes a base portion and a projecting portion. The base portion has a substantially rectangular shape, to which the sealing member is affixed. The projecting portion projects from the center of the base portion toward the inside of the developing roller along its length, without being caught between a supply roller and the developing roller.
Abstract:
In a color laser printer, each scanner unit as an exposure scanning unit is positioned on a lateral side of a developing unit, so as not to face the surface of a photoconductor drum as a photoconductor. The scanner unit emits a laser light scanned in a direction perpendicular to a rotation axis of the photoconductor drum. A last mirror, having a reflecting surface at an angle of 45° with respect to the direction of the rotation axis of the photoconductor drum, is arranged to face the surface of the photoconductor drum. The last mirror reflects the laser light emitted by the scanner unit in the direction of the rotation axis of the photoconductor drum and changes the traveling direction by 90° to irradiate the surface of the photoconductor drum. This configuration allows a process cartridge including the developing unit to be attached and detached from above.
Abstract:
In order to prevent toner leaks from both sides of a developing roller disposed within a case accommodating polymerized toner, side seals each having a TEFLON® (polytetrafluoroethylene) felt member on its surface are provided to make sliding contact with a surface of the developing roller. In addition, “Hanarl FL-Z75” (80-90 wt. % hydrofluorocarbon and 10-20 wt. % polytetrafluoroethylene) manufactured by Kanto Kasei Ltd., is used as a lubricating agent for the TEFLON® felt members to make them more lubricative. Accordingly, noise generated by the side seals sliding contact with the developing roller can be reduced. To prevent toner leaks from the sides of the developing roller, a film or resin stopper is disposed at a lower-end front edge of the case to stop the toner.
Abstract:
A cam member has each of a plurality of first exposure-side surfaces provided in association with a first contact part of each exposure units and each of a plurality of second exposure-side surfaces provided in association with each first contact part. Each first contact part confronts but separates from the corresponding first exposure-side surface when the corresponding exposure unit is disposed in an adjacent position where the exposure unit is capable of exposing the corresponding photosensitive drum. Each first contact part is in contact with the corresponding second exposure-side surface when the corresponding exposure unit is disposed in a retracted position positioned farther than the adjacent position from the photosensitive drum.
Abstract:
A process cartridge includes a developing cartridge, drum cartridge, and end member. The developing cartridge and drum cartridge include first and second driving force receiving units, respectively. The second receiving unit is disposed on the same side on which the first receiving unit in an axis direction of photosensitive drum. A developing frame is movable within a prescribed distance in the axis direction relative to a photosensitive drum frame. The photosensitive drum is movable in the axis direction relative to the drum frame within a predetermined distance. The end member includes a drum contact surface, developing frame contact surface, and external member contact surface. When the first and second receiving units are in a predetermined state, a photosensitive drum contacts to the drum contact surface, the developing frame contacts to the developing frame contact surface, the external member contact surface contacts to an external member.
Abstract:
A process cartridge includes a developing cartridge, drum cartridge, and end member. The developing cartridge and drum cartridge include first and second driving force receiving units, respectively. The second receiving unit is disposed on the same side on which the first receiving unit in an axis direction of photosensitive drum. A developing frame is movable within a prescribed distance in the axis direction relative to a photosensitive drum frame. The photosensitive drum is movable in the axis direction relative to the drum frame within a predetermined distance. The end member includes a drum contact surface, developing frame contact surface, and external member contact surface. When the first and second receiving units are in a predetermined state, a photosensitive drum contacts to the drum contact surface, the developing frame contacts to the developing frame contact surface, the external member contact surface contacts to an external member.
Abstract:
An image forming device includes a casing, photosensitive bodies, developing devices, developer accommodating devices, and a retaining member. The developer accommodating devices includes a first developer accommodating device that is individually replaceable and separable from the corresponding developing device and a second developer accommodating device that is replaceable together with the corresponding developing device. The retaining member retains the photosensitive bodies arranged in an arrangement direction, the developing devices, and the developer accommodating devices at fixed positions within the casing. The retaining member is capable of being pulled out from the casing and is movable between a housed position and a withdrawn position. One of the developer accommodating devices located at a most downstream side in the arrangement direction is the first developer accommodating device, and each of the developer accommodating devices other than the one of the developer accommodating devices is the second developer accommodating device.
Abstract:
A cartridge for use with an image forming apparatus that includes a frame to which the cartridge can be mounted is provided. The cartridge includes a developer carrier, a first electrode provided at one side thereof, and a housing including a bulkhead. Frame includes a second electrode that is configured to electrically couple to the first electrode The second electrode and the bulkhead are arranged to overlap each other when viewed from a longitudinal direction.