| 摘要 |
PURPOSE:To enable electrostatic discharging operation whenever a moving frame returns by making the abutting part of a shutter plate abuts on and move the moving frame at the end of the closing operation of a shutter plate through the operation of a driving wire. CONSTITUTION:When an original 1 is exposed, the driving wire 14 fixed to a fixation part 9 is drawn as shown by an arrow A and the shutter plate 20 opens an opening part. When the 1st moving frame 3A returns at the end of exposure, the driving wire 14 is drawn as shown by an arrow B and the shutter plate 20 slides firstly as shown by the arrow B to close the opening part 21 completely. Then when the abutting end 24 abuts on an edge 22, the 1st moving frame 3A moves as shown by the arrow B with the tensile force of the wire 14 and light from an exposure lamp 3a is reflected by the white surface of the shutter 20 and guided as light L2 to a photosensitive drum through mirrors 4a and 4b, etc. This light removes unnecessary charges on the surface of the photosensitive drum 7. |
