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10-4 Functional Overview
HP DesignJet 430, 450C and 455CA Printers
Moving the Carriage
CarriageĆDrive Mechanics
Motor, Belt and Pulley
D The carriage (YĆaxis) drive consists of a DC motor directly driving a single
belt and the carriage.
D The motor assembly itself provides the tension needed on the belt,
eliminating the need for a separate pulley tensioner.
D The belt clamps itself to the carriage; there are no separate belt clamps.
D The interface between the motor shaft and belt is friction based.
D You can remove the belt without having to remove the pulley on the left
end of the belt.
Carriage Guidance
The carriage moves along on just one stainless steel slider rod. It is guided by
two integrated bronze bushings, which are selfĆlubricating, and a back wheel.
Positional Feedback
An encoder strip provides feedback on the position of the carriage. The strip
does not require adjustment.
Carriage PCA
The carriage PCA is based on that of the DesignJet 650C. It connects to the
main PCA through a long 60Ćconductor (2x30) trailing cable. The carriage
PCA contains:
D Optical line sensor
D Thermistor circuit
D Linear encoder
D Cartridge nozzle firing circuit
Some electronic components on the DesignJet 450C and 450CA carriage PCA
are not present on the DesignJet 430 carriage PCA. At powerĆon the Printer
firmware identifies whether the carriage is for a color or a monochrome
model, and behaves accordingly.