| 摘要 |
<p>A sheet direction inverting apparatus has a switchback portion (105) for inverting the conveying direction of mails and the switchback portion (105) has a drive roller (14) and a driven roller (16). The length of mails sent to nips of the two rollers (14,16) in the conveying direction is detected by a sensor (S3), and after switching back, the length of the mails sent from the switchback portion in the conveying direction is detected by a sensor (S5), and an overlapped sheets detector (110) compares detection results. When the detection results are different, the overlapped sheets detector (110) detects overlapping of the mails. <IMAGE></p> |
