| 摘要 |
PURPOSE:To make a sheet closely contact to the transparent plate side in a short time, by moving a push roller from the front side of the machine body to the rear side while the roller is rotated after the roller is lowered and pressed against the sheet. CONSTITUTION:A thick plate 3 and a photosensitive plate 4 are placed on a transparent plate 2, and a sheet roll 6 and a push roller 21 are set to stand by at the rear side. When the positioning of the thick plate 3 and the photosensitive plate 4 against the transparent plate 2 is completed, a driving mechanism 13 feeds a chain 16 anticlockwise and a rod 7 is moved toward this side, and then, the rod 17 is moved toward this side while it is at the uppermost position supported by a rod 7 side through a coupling mechanism 33. At this time, a chain 29 is fed anticlockwise without load. Therefore, the push roller 21 surely moves toward this side following to the sheet roll 6 and, at the same time, the sheet roll 6 gradually extends the sheet. When the sheet roll 6 extends the sheet, the sheet roll 6 gradually goes down in accordance with the inclined condition of a lifting guide plate 12, so that no gap is produced between the sheet 5 and the transparent plate 2. |
