| 摘要 |
A copier or printer uses the principle of single pass duplexing which produces simplex output at full machine speed and duplex output with a gap of at least one sheet between sheets. It has a duplex fuser that fuses both duplex images simultaneously. The duplex fuser has a first relatively hard roller which contacts the side of receiving sheets carrying simplex images and a soft heated roller which contacts the opposite sides of sheets. The soft roller is heated, in part, by a lamp in its center, and, in part, by heat from the first roller which is passed to the soft roller between duplex sheets. The soft roller therefore runs at a higher temperature for duplex than it does for simplex. The hard roller preferably has a thin elastomeric layer on a metal core and therefore transfers heat to its surface more efficiently and faster than the soft roller.
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