28 Nov
2005
28 Nov
'05
3:03 p.m.
On 11/27/2005 at 9:02 PM ard at p850ug1.demon.co.uk wrote:
Have you come across the DEC LA100 (or LA210) that
'dip' the head
mechanically to get the half dot spacing?
Nope, but sounds logical. The Durango uses an 18" wide HP ribbon cartridge From waht I remember there were a pair of solenoids,
one each side of the
carriage, connected in series (maybe in parallel, but at least
there were
only 2 wires back to the logic board). The armature was a permanent
magnet with a groove round it. Passing a pulse one way through the coils
sent the armature to one side, a pulse the other way sent it to the other
side. In one postiion the printhead was a little lower due to the groove.
FWIW, the LA100 is nowhere near as mechanically well-built as the Sanders.
with the 3/4" ribbon in it, driven via a cable
and a unidirectional clutch
through the carriage motor. The ribbon spans the entire page, but is
slanted, so the entire surface is used while printing. There's no 2-color
ribbon facility as there is on the daisywheels.
The Sanders 12/7 uses a film ribbon on a spool. It fits on one side of
the chassie, the ribbon runs round pulleys (and across the front of the
head, then round that motion-detector roller I mentioned and onto the
takeup spool on the other side of the chassis.. I had a fair number of
problems with insufficient tension and the ribbon falling off its guides.
The 700 takes the Diablo HiType/630 film ribbon cartridge (I have never
tried a fabric ribbon, and don't intent to for fear of damaging the
printhead pins).
In both cases there's no colorchnage mechnaism. It's strictly black-only.
-tony