| 摘要 |
PURPOSE:To attain efficient exposure of an original by covering an original positioned by pins and the surface of an original platen including pin bar/ independent pins with an original cover sheet and a pin cover sheet and reducing pressure between respective sheet and the original platen to secure the alignment of each original. CONSTITUTION:The end parts of the transparent original cover sheet 15A on an original platen box 11 are stuck and joined by a flexible sheet 15B and fixed on the position of a blacket 11a by adhesion or clamps 15C so that the cover sheet 15A and the vinyl sheet 15B can be optionally bent and optionally opened/closed at the border line of both the sheets, a window 15D is formed on the sheet 15A and the pin cover sheet 16 consisting of an air-tight elastic material is stuck to the edge side part 15E of the window 15D. At the time of replacing an original film, the preparation can be completed only by turning up the sheet 15A at the joining part of the sheet 15B and executing opening/ closing work. Thus, the inspection work of a printing negative plate can be made efficient.
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