| 摘要 |
PURPOSE: To overlap printing papers and offset papers in a short time and easily evaluate an offset density by transferring a printing paper to a paper discharge part, pressing the printing paper tightly to an offset paper, guiding the transferred printing paper to a pressing means while selectively switching the papers and feeding the offset paper synchronously with the feeding of the printing paper to the pressing means. CONSTITUTION: A paper feed roller 29 of an offset paper feed means 13 is activated by the action of a clutch, so that an offset paper 10 is fed and overlapped/pressed onto a printing paper 9 by a pressing means 31. An offset density evaluation data 15 is thus formed. An offset level is quantitatively evaluated by a densitometer. After the preceding printing paper 9 passes a switching means 24, a following printing paper 9 is transferred to reach a guide plate 36, which is detected by a second sensor 37. A flap 25 is consequently moved down. As a result, the operation of the paper feed roller 29 of the offset paper feed means 13 is stopped to stop the feeding of the offset paper 10, while the printing paper 9 is stored in a paper discharge part 14. The printing papers 9 are prevented from overlapping with each other at the pressing means 31 and therefore, it is not necessary to interrupt the printing operation during the offsetting. |
