Abstract: A high voltage switching equipment for sequentially supplying a high voltage to color developing devices, for developing an electrostatic latent image formed on a photoconductive medium of a color image forming apparatus using color toners includes high voltage applying terminals respectively formed in rear ends of fixed color developing devices contacting the photoconductive medium through a nip, a high voltage applying substrate, within which a high voltage circuit is installed, on which connector terminal strips connected to the each high voltage applying terminal are provided on one side, and on which first terminal strips connected to the high voltage circuit and second terminal strips connected to the connector terminal strips are arranged in pairs on the other side with a constant distance, and a high voltage connecting unit connecting the first terminal strips and the second terminal strips arranged on the high voltage applying substrate, so that the high voltage is supplied to a relevant developing d

Abstract: A contact shock dampening and development nip forming apparatus for developers includes a unit to dampen a contact shock and to form a development nip installed on both ends of a developing roller to be disposed between a photosensitive body and the developing roller. Accordingly, the contact shock dampening and development nip forming apparatus absorbs shocks applied to the photosensitive body from the developing roller upon changing the developers, to thereby protect the photosensitive layer of the photosensitive body and extend the lifespan of the photosensitive body. The apparatus also maintains a thickness of the development nip to thereby obtain a steady image quality, even though the developing roller and/or the photosensitive body may be formed of solid substances.

Abstract: There is provided a paper pickup device in a paper feeding cassette having a knock-up plate. In the paper pickup device, a first curved slot is formed on a frontal portion of each sidewall of the paper feeding cassette, a second curved slot is formed above the first slot on one sidewall of the paper feeding cassette, a shaft is protrusively inserted into the first slots from the inside of the paper feeding cassette, a connecting member is rotatably connected to the sidewalls of the paper feeding cassette by hinges, and has a first engaging portion extended upward from a body thereof and a second engaging portion horizontally spaced from the first engaging portion by a predetermined distance and a sub-plate is extended from the connecting member under the knock-up plate, for pressing upward the knock-up plate.