| 摘要 |
PURPOSE:To obtain an electrophotographic copying device of a two rotation one process system using a belt-shaped photosensitive body, which scarcely causes a fog of a ground part of a picture, even if a copying process is repeated many times, and is advantageous in its service property, by driving a development auxiliary member inscribed so as to press the back of the belt-shaped photosensitive body, and a cleaning auxiliary member, like a pair of seesaws. CONSTITUTION:A belt-shaped photosensitive body 15 is stretched to a driving roll 16, and a driven roll provided with a tension applying means 18 by a spring for applying a moderate tension to the belt-shaped photosensitive body, and rotates and runs. A development auxiliary member 12 and a cleaning auxiliary member 13 are driven by an auxiliary member driving means centering around a supporting point 14 like a pair of seesaws, and a distance between the surface of the belt-shaped photosensitive body and a developing means 7, and a distance between the surface of the belt-shaped photosensitive body and a cleaning means 11 are changed. Following a rotating running of the belt-shaped photosensitive body 15, a main electrostatic charge and an exposure are executed at the time of the first rotating running, cleaning and destaticization are not executed, and a development is executed. Subsequently, at the time of the second rotating running, an electrostatic charge means 2 is switched to a transfer voltage, a body to be transferred is supplied, and an image on the photosensitive body is transferred to the body to be transferred, and fixed by a fixing means 8. |
