Presumably it pauses whilst it loads information back onto the drum, as
I presume it doesn't have a drum with a four foot circumference.
Good question, I don't think it can pause because of the inertia of the paper
transport. But I have to say I have never printed a banner on one of these.
Unlike inkjets, lasers can't stop and restart the transport that quickly and if
they did I am sure there would be a resulting blemish on the paper, so I guess
the drums (4 of them in this case because it is a single pass process unlike
carousel colour lasers) are being refreshed in flight.
I expect that is a function of the LED array to drum transfer which uses prisms
and/or mirrors and of the transfer belt which is a continuous belt that
services all of the drums instead of a transfer roller for each drum. The drums
are quite small, I would guess about 1" in diameter.
The LED array has the added advantage of producing a higher quality image due
to the absence of a rotating laser mirror. That is why we know of several
photographers who believe the quality is high enough for them with the added
advantage of better longevity than some inkjets.
It is worth noting that OKI has never made inkjet printers but instead
concentrated on LED array "lasers", their early monochrome printers were not
too flash but I think they have really done it well with the colour range of
LED printers.
Tony