| 摘要 |
<p>PURPOSE: To carry out image-forming efficiently by making a returning portion equip a paper re-feeding roller contacting with a second sub-returning roller, and a biasing roller which moves downward on the occasion of re-feeding a paper and turns synchronous with a main returning roller by contacting with a re-feeding paper so that a paper sheet is biased toward the paper re-feeding roller. CONSTITUTION: A biasing roller 15, turning counterclockwise synchronous with a main returning roller 4, is moved downward so as to contact a preceding paper P1 with a regular time-lag after the rear end of the preceding paper P1 is detected by a returning sensor 19. The preceding paper P1 is conveyed by the biasing roller 15 toward a second sub-returning roller 6 and paper re- feeding roller 14. Then, the biasing roller 15 is moved on upper position apart from the preceding paper P1, while the preceding paper P1 is re-fed to to an image-forming portion by the second sub-returning roller 6 and the paper- refeeding roller 14. Besides, a following paper P2 is conveyed to a turning portion 7 through a conveying portion 2 so that it is turned there and conveyed to a paper re-feeding portion 8 in the same way as the case of the preceding paper P1.</p> |
