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    • 60. 发明公开
    • Image formation apparatus, developing device incorporated therein and conductive rubber roller used therein
    • 图像形成装置,与其共同使用的开发装置和使用的导电橡胶滚子
    • EP0590768A3
    • 1996-07-24
    • EP93306226.7
    • 1993-08-06
    • FUJITSU LIMITED
    • Kamaji, HidekiKawabata, KazumiHirose, KazunoriYoshida, SadaakiTanimoto, Takeshi
    • G03G15/08G03G15/16
    • G03G13/08G03G15/0806G03G15/0812G03G15/0818G03G15/1685G03G2215/0866
    • An electrostatic latent image formed on a photosensitive drum is electrostatically developed with a non-magnetic type developer, and is electrostatically transferred from the drum to a paper. The developer is composed of a toner component and a resin powder component, one component of which has a polarity opposite to that of an electric charge of the other component generated by triboelectrification therebetween. In the developing process, a conductive foam rubber developing roller (22b) is used, which includes a conductive tubular foam rubber roller element, and a metal shaft inserted into a central bore thereof. The roller element has an outer thicker portion including a conductive filler dispersed therein, and an inner solid skin layer defining the central bore thereof and exhibiting an electrical resistivity considerably higher than that of the thicker portion for lack of conductive filler. Nevertheless, a sufficient electrical contact is established between the roller element and the shaft. A thin metal blade (22c) is pressed against the roller (22b) for regulating the thickness of the developer entrained thereby, and is arranged to compensate for a resilient deformation of the shaft caused when pressing against the blade (22c) the roller (22b).
    • 在感光鼓上形成的静电潜像用非磁性显影剂静电显影,并从鼓静电转印到纸上。 显影剂由调色剂组分和树脂粉末组分组成,其一种组分的极性与由它们之间的摩擦带电产生的另一组分的电荷的极性相反。 在显影过程中,使用导电泡沫橡胶显影辊,其包括导电管状泡沫橡胶辊元件和插入其中心孔中的金属轴。 辊元件具有包括分散在其中的导电填料的外部较厚部分和限定其中心孔的内部固体表层,并且对于缺少导电填料而言,电阻率显着高于较厚部分的电阻率。 然而,在滚子元件和轴之间建立了足够的电接触。 薄的金属刀片被压靠在辊子上,用于调节由此夹带的显影剂的厚度,并且被布置成补偿当压在辊子上时引起的轴的弹性变形。