摘要:
An image formation apparatus has photo conductor drums, and upstream developing rollers and downstream developing rollers that are brought into contact with respective photo conductor drums based on a changeover. The developing rollers develop latent images into visual images. A time required to change over a developing unit from one developing unit to the other developing unit is set as follows. A changeover time T2 from the downstream developing rollers to the upstream developing rollers respectively is set shorter than a changeover time T1 from the upstream developing rollers to the downstream developing rollers.
摘要:
The present invention is directed to a method for color management by a retailer comprising the steps of: choosing an engineered color standard (ECS); communicating the ECS to a product vendor; having a product produced using the ECS; and controlling the product's color quality by comparing the ECS to the produced product. The ECS preferably comprises reflectance data and a dye specification.
摘要:
An image forming device includes an image forming unit and a thermal fixing unit. The image forming unit uses a plurality of different color developing agents to form a color image on a recording medium. The plurality of different color developing agents are configured from binding resins with the same thermal properties. The plurality of different color developing agents include at least a high-resistance developing agent and a low-resistance developing agent. The high-resistance developing agent has a higher electrical resistance than the low-resistance developing agent and a lower charge-to-mass ratio than the low-resistance developing agent. The thermal fixing unit thermally fixes the color image onto the recording medium.
摘要:
An intermediate belt made of an endless belt is provided by 45 degrees inclined horizontally and looped over two rollers at both its ends, and four photosensitive drums are provided in contact with the top surface of this intermediate belt. A reflection mirror is provided over each photosensitive drum, and a single polygon mirror is provided on almost the same level as these reflection mirrors. The polygon mirror is provided on the side of the reflection mirror of which optical path to the corresponding photosensitive drum is the longest so that the optical path lengths from the polygon mirror to the respective photosensitive drums are equal to each other.
摘要:
An image forming apparatus includes an image bearing body bearing a toner image thereon, transferring blade for transferring the toner image on the image bearing body to a transferring material, and charging roller having a voltage applied thereto to thereby charge the transferring material before the transfer by the transferring blade. The voltage applied to the charging roller is controlled on the basis of a current produced when the leading edge portion of the transferring material is charged by the charging roller.
摘要:
An image forming system is disclosed which can prevent toner stain adhered onto an image bearing member at the time of switching from one developing unit to another from adhering to an image area on an intermediate transfer member and which can thereby prevent the deterioration of image quality. Latent images formed on a photoreceptor drum are developed by developing units in a revolver developing unit, toner images thus formed are primarily transferred in an overlapped state onto an intermediate transfer belt in a primary transfer section, and the thus primarily transferred toner images are together transferred secondarily onto a transfer paper. In this image forming system, a revolving operation of the revolver developing unit is controlled so that an area on the photoreceptor drum with which a developer contained in a Bk developing unit comes into contact upon 22.5null revolution of the revolver developing unit from a home position with consequent movement of the Bk developing unit to a developing position contacts a not-to-be-transferred area on the intermediate transfer belt in the primary transfer section. By so doing, toner stain caused by the Bk developing unit which has moved to the developing position does not exert any influence on the toner images formed on the intermediate transfer belt.
摘要:
An optical scanning device includes a plurality of light sources, a drive circuit connected to the light sources to drive the light sources independently with from each other in a modulating manner, a deflector having a plurality of deflecting surfaces to deflect rays emitted from the light sources and scan imaging optical systems directing the deflected rays onto different scan surfaces respectively. The optical scanning device further includes synchronization detection means for receiving the rays before start writing onto the scan surface and outputting synchronization detection signals, delay time adjusting means for adjusting delay time, the delay time being a time period after outputting the synchronization detecting signal until starting the writing operation, and frequency adjustment means for adjusting driving frequencies of the light sources.
摘要:
Optical systems are disposed in the two symmetrical direction with respect to an optical deflector, and direct the optical beams deflected by the optical deflector into respective surfaces to be scanned, and forming images thereon. A housing encloses a plurality of light sources, optical deflector and optical systems, the housing comprises a base plate on which the optical deflector and optical system, and a side wall surrounding the base plate; the base plate divides the housing into two sections; the plurality of light sources are disposed on the side wall; and optical components of the optical systems are distributed into the two sections of the housing.
摘要:
An image forming apparatus includes an image forming portion for forming an image on a recording material; a recording material bearing member for bearing and conveying the recording material toward the image forming portion; an attraction charging member that is disposed so as to come into contact with the recording material bearing member and induces charges to electrostatically attract the recording material onto the recording material bearing member; a power supply for supplying an electric current to the attraction charging member; and a control portion for changing a value of the electric current in accordance with the length of the recording material in a direction perpendicular to a recording material conveying direction.
摘要:
A belt unit is attached to an apparatus. The belt unit includes a drive roller and an idle roller about which a belt is entrained and runs, and a first bearing fitted to a shaft about which the drive roller rotates. The apparatus includes a cutout that receives the first bearing, and a locking member that engages the bearing to firmly hold the first bearing in position. A line passing through the centers of the first and second gears makes an angle with a vertical line passing through the center of the first gear, the angle being larger than a pressure angle between the first gear and the second gear. The apparatus has a groove that extends in a direction parallel to the direction of travel of the belt and receives the bearing of the idle roller.