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Theory of Operation 2-5
NovaJet 800 Series Service Manual
The Carriage Axis Drive
CARTRIDGE 1
CARTRIDGE 2
CARTRIDGE 3
CARTRIDGE 4
OPTICAL ENCODER
OPTICAL SENSOR
PAPER SENSOR
CARRIAGE
PWA
TRAILING
CABLE
CONNECTION
FROM
MAIN
PWA
TRAILING
CABLE
INKJET
DRIVERS
LEFT AND RIGHT CARRIAGE ASSEMBLY
RIGHT CARRIAGE
ASSEMBLY ONLY
Figure 2-3. Carriage Axis Drive.
The Carriage Axis Drive moves the printer’s carriage assembly along the
length of the printer. The drive consists of a servo motor, linear encoder
strip, drive belt, and tensioning assembly. These items are illustrated in
Figure 2-3.
The servo motor, drive belt, and tensioning assembly are the components
that actually drive the carriage assembly. The servo motor drives the belt
back and forth allowing the attached carriage assemblies to be reposi-
tioned as required. The tensioning assembly is spring controlled and
allows the proper amount of tension on the belt.
The linear optical encoder strip is used to obtain the printers accuracy
along the axis of the printer. The strip of film has 150 parallel lines per
inch printed on it. By utilizing two optical encoder sensors that are
slightly off set from each other, and reading the leading and trailing edges
of the lines, a resolution of 600 dpi can be obtained.
The stepper and servo motors are controlled from the main printed circuit
assembly by the microprocessor.