| 摘要 |
PURPOSE:To form original images of plural surfaces on the same plate material automatically by providing a light shield curtain driving means, setting means for forming plural original images on the plate material, and a controller which drives a plate material conveying means and the light shield curtain driving means. CONSTITUTION:While an original 7 is placed on an original platen 6 so that the center of the original is aligned to an optical axis 15, the center of the 1st exposure position is made coincident with the optical axis 15 and the position of the plate material 2 is determined at an exposure part 5. Then, the winding-in shaft 21a of BDA19a is driven through SM242 as shown by an arrow by reference extension length SAE1 until a nonexposure part of the plate material 2 is masked with BDA19, and then the 1st exposure is carried out to form the 1st original image at the front end side of the plate material 2. Then while the original 7 is left as it is, the plate material is conveyed downward by SM141 until the center of the 2nd exposure place coincides with the optical axis 15. Then, the winding-in shaft 21b of BDB19b is driven through SM342 as shown by an arrow by reference extension length SBE1 until the last exposed part of the plate material 2 is masked to extend BDB19, and then the 2nd exposure is carried out to form the 2nd original image even at the rear end side of the plate material 2. |
