Internally-heated external rollers transfer heat rapidly to a fuser roller
in an electrostatographic printer. Stored media process set points, input
image content, and input media type data are used to regulate the heat
transfer rate by varying the nip width between the heated external rollers
and the fuser roller. The rate of heat transfer and the rate of heat
transfer adjustment are sufficiently rapid that many different media
weights and types may be mixed in a print run without restrictions on
media run lengths, without collation requirements per run, and without
productivity losses due to slowing of feed rate for heavier receivers.
