| 摘要 |
A duplex reproduction system which produces duplex copy sets in collated separated stacks from a stack of precollated documents includes a document feeding apparatus which feeds a stack of documents individually onto the platen of a copy processor for producing copies of each document. The copy sheets are transported to a receiving tray in a sorting apparatus which does not sort the copy sheets when producing the first side of the duplex copies. As an improvement, the copies are cleaned on the back (non-image) sides thereof to remove unfused toner. The documents are reloaded into the document feeding apparatus for feeding the documents with the second side onto the platen of the processor. On the simplex or first pass a circuit disables the sorting function of the sorting apparatus. The copy sheets are removed from a single receiving tray of the sorter for a second or duplex run. On the second pass the copies are cleaned on the first side and distributed sequentially to the different trays of the sorting apparatus which is now energized to produce duplex copy sets in separate collated bundles without rearranging or reshuffling of the documents or copy sheets.
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