| 摘要 |
There is disclosed an image forming apparatus capable of double-sided or overlay copying at high speed. While a sheet having initially copied a first original document is still being transported to an intermediate tray inside the apparatus, an image forming operation on a second document is started, and one of the initially copied sheets in the intermediate tray starts to be refed therefrom for secondary copying. If the designated number of copying sheets is larger than a predetermined value and when the number of times the image forming operation is performed has exceeded that value, the start of the subsequent image forming operation is delayed by a predetermined time so as to provide the currently transported sheet with an extended distance relative to the preceding sheet. Thus there occurs no interference or feed-related trouble between the sheet which copied the first document and which is being transported to the intermediate tray on the one hand, and the sheet refed from the same tray upon starting of an image forming operation on the second document on the other hand.
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