PRINTER DESCRIPTION
27080 Issue 1 September 98 6--5
Gutter. Ink caught in the gutter is drawn back into the ink system for
re--usebyapumpinthecabinet. Theguttersystemintheheadconsists
ofthe gutterpipe,ashortlengthof tube,and a gutter sensorconsisting
ofa lengthofpipeelectricallyisolatedfromthechassis. Ink isdetected
by monitoring the electrical continuity through the ink between the
gutter and the gutter sensor.
Ink Pressure. Whilethebest print quality is given byan optimumink
working pressure (usually about 2900mbar/42psi or 4000mbar/60psi for
Pinpoint), print quality remains acceptable within certain limits above
or below this pressure. The pressure range between the limits of
acceptable print quality is called the pressure window and depends
upon the type of ink.
Auto--flush. It is not possible to fully control the drops when the jet is
being started and stopped. To prevent problems caused by scattering
ink drops, a supply of make--up is connected into the drop generator.
When the jet is switched off, the supply to the drop generator is
switchedover frominktomake--up. Thegeneratorfillswithmake--up
and the jet becomes make--up, which cleans the nozzle and the gutter.
Any stray drops not collected in the gutter evaporate with very little
residue. Atstart--up,themake--upinthe gunbodyisreplacedwithink
ready for the head solenoid to open.
Positive AirSupply. Contaminantscanbe pickedupbythe ink drops
in flight, or be drawn with the airintothegutter. Available asoptions,
asmallpumpintheprintercabinetoranexternalairdryer(A300/A200
only)can supply clean air to the print head, maintaining a positive air
pressure inside the head to keep out dust, etc.
CABINET
The cabinet is made of stainless steel with doors to two separate
compartments. Theupper doorcarriestheprintercontrolpanel andis
lockable. The conduit serving the print head and all external
connections enter the left hand side. There are transport handles on
bothsides ofthecabinet. Forstability, thecabinetmustbemountedon
astabiliserkitorstand(seePart10:Options). Alternatively,thecabinet
must be bolted to a stable surface.
Theuppercompartmenthasahingedcoverplatebehindtheouterdoor
that provides both general protection and a mounting surface (on its
inner face) for part of the electronic components.
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