PRINTER DESCRIPTION
27080 Issue 1 September 98 6--3
PRINTER DESCRIPTION
PRINT HEAD
General Principles
Each printed character consists of a dot
matrix made up of lines, or strokes, of ink
drops. The ink drops in each stroke are
spacedapartbyelectronicdeflectionandthe
strokesarespacedapart bythemovementof
the print surface under the head.
Inside the print head, ink is supplied under
pressure to the dropgenerator, and emerges
throughasmallnozzleas averyfinejet. The
drop generator contains a drive rod which
creates ultrasonic pressure waves in the ink,
making the jet break up into a stream of
separate drops shortly after leaving the
nozzle.
Thebreak--upis adjustedtooccurwithinthe
charge electrode, where each ink drop is
given an electrostatic charge by putting a
voltageontothechargeelectrodeasthedrop
breaks off. The size of the charge on the ink
dropdependsuponthevoltageonthecharge
electrode.
The ink drops then pass through the
electrostatic field set up between between
two high voltage deflector plates. The
directionofflightofeachchargedinkdropis
deflected by an amount dependent upon the size of the charge.
Ink drops not required for printing are not given electrostatic charges
and are collected in the gutter.
Details
Theprintheadcomponentsaremountedonarigidchassis,withafully
enclosedtopsectioncontainingtheconnectionsbetweentheprinthead
and conduit wiring.
Ink
Drops
Unused
Positions
Stroke
TP1130--1
Drop
Generator
Charge
Electrode
Nozzle
Plate
Deflector
Plates
Gutter
TP1141--5
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