| 摘要 |
PURPOSE:To prevent a sheet from being left by detecting whether or not the sheet is left to control image forming motion according to the detecting signal. CONSTITUTION:A copy paper passing through a fixer 20 in copying the surface, conveyed by discharge rollers 22 and proceeding while having surplus charge discharged by a discharger 23 has the rear end detected by a light receiving element 24 with respect to the passage through the fixer 20 and is conducted to a back copying path 25 by the reversal of a paper discharging roller 22. While the paper discharging roller 22 is reversed, a guide plate 26 is displaced to a position where the copy paper is guided to a path 25 so that the copy paper is introduced to a paper feeder for back surface and stocked there when a number of sheets are copied. Next, the back surface is carried out by sending out the copy paper with the rotation of a roller 672 so that the copy paper is controlled again by a register roller 29 through a conveying rollers 28 while being sent into a copier by paper supply signals, and discharged to a tray 30 by a paper discharging rollers 22 through the fixer 20 after the completion of transfer. |
