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Service Guide ML320/ML321
Chapter 2 Principles of Operation
2.4.02 Space Mechanism / Operation
The spacing operation is performed by applying power to the DC spacing motor. This drives the
carriage frame along the carriage shaft, space rack, and guide rail. The carriage shaft, space rack,
and guide rail are parallel to the platen.
The spacing motor assembly consists of the following items.
DC Motor / Gear
Carriage Frame
Carriage Shaft
Space Rack
Encoder Disk Sensor
Encoder Disk
Guide Rail
Spacing Operation
The printhead and spacing motor are mounted on the carriage frame. The carriage frame
moves along the carriage shaft, space rack, and guide rail. The carriage shaft, space rack,
and guide rail are parallel to the platen. As the spacing motor rotates counterclockwise,
the carriage frame is driven to the right.
When the spacing motor rotates one turn, the carriage frame moves 0.8 inch (20.32 mm).
