| 摘要 |
PURPOSE:To improve positional accuracy on a photosensitive body, in a blank in an axial direction, and the sharpness of an edge part by disposing a first shutter member nearby the face of the photosensitive body, and a second shutter member nearby a light source. CONSTITUTION:Front, middle, and rear slide shutters 12-14 controlling the movement of the photosensitive body and a passing range in the vertical direction, in a width blank exposure 6, are slid to move on a rail 15 supported by a lower frame 11. On the other hand, in a shutter 23 selectively controlling passing in an exposure for leading and tailing edge blanks 8, both end parts in the longitudinal direction are turnably supported by a rotation center 24. At this time. out of exposing means, the shutters 12-14 are provided so as to get near to the photosensitive body 1 as much as possible, and the edge part of a distance image forming region can be sharply exposed. Moreover, the shutter 23 is provided so as to get near to an exposing lamp 17, as much as possible, a region where the diffusion of a luminous flux is lessened, can be regulated, and the ON-OFF of an optical path can be attained by a minimum stroke. |
