Duplex system and method for pre-collation copiers

摘要: A method and apparatus for providing duplex copies in pre-collated output copy sets from a set of documents recirculated order by first copying only the even-ordered once onto sides substrates transporting those to buffer; then making individual all alternately odd on reverse side fed buffer while even ordered different substrate source, made an tray create simultaneously other source replace therefrom; repeatedly individually latter manner number document recirculations equal one less than total desired, then, last set, buffer.