| 摘要 |
PURPOSE:To prevent the scattering of a toner in a copying device during development by disposing freely movably in and out a pair of movable dustproof sealing members so as to cover both ends in the aperture of a developing sleeve, retreating the members to the inside during rotation and movement of a rotary station and advancing the members to the outside from the rotating outside diameter of the rotary station so as to approach to the outside circumferential surface of a photosensitive drum during development. CONSTITUTION:Pin members 13, 13' are simultaneously driven toward the outside of long holes 12, 12' and the movable dustproof sealing members 10, 10 are simultaneously housed into the inside from the rotating outside diameter 2' of the rotary station 2 during the rotation and movement of the rotary station 2. The contact of the members 10, 10' with the surface of the photosensitive drum 5 is therefore obviated. Pin members 13, 13' are simultaneously driven toward the inside of the holes 12, 12' and the top ends of the members 10, 10' are simultaneously advanced to the outside of the diameter 2' of the station 2 so as to approach to the surface of the drum 5 in the stage of the development. The scattering of the toner is thus prevented during the development. |
