G - Physics – 03 – G
Patent
G - Physics
03
G
314/7
G03G 15/00 (2006.01) G03G 13/00 (2006.01) G03G 15/23 (2006.01)
Patent
CA 1208688
-1- ABSTRACT OF THE DISCLOSURE In recirculatively precollatively copying a set of plural simplex original documents onto both sides of copy sheets to produce a desired plural number precollated duplex copy sheet sets, by normally copying the documents only once in each copying circulation of the document set, and by forming a buffer set of copies of alternate document pages being duplexed which buffer set copies are printed on only one side, and temporarily stored in a duplex store and by copying alternate documents onto the opposite sides of the buffer set copies in proper sequence to form collated duplex copy sets, and wherein said documents are all copied unidirectionally in reverse (N to 1) page order, the improvement comprising: counting the number of documents in the document set and determining that the number of documents is more than three but less than approximately ten, and in response to that determination, automatically switching the mode of copying the document sheets to a higher productivity small document set mode including the steps of initially building two complete and identical buffer sets of alternate page documents on two initial copying circulations of the document set and placing both identical buffer sets in the same duplex store and then skipping the copying of the alternate document pages in the two buffer sets in the final two copying circulations of the document set to deplete the two buffer sets. If the number of copy sets made is greater than two, all of the documents are copied in all intermediate document copying circulations (other than said first two and said last two copying circulations) to maintain the two buffer sets during these intermediate circulations by simultaneously rebuilding and depleting the two buffer sets.
434967
Sim & Mcburney
Xerox Corporation
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