Chapter 2
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2.3.3.2 Paper Path
2.3.3.2.1 Structure of Feed Roller Unit
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a) Paper feed assembly
The paper feed assembly consists of paper feeding mechanisms, such as a feed roller that is driven by the feed motor and a pinch roller unit that follows up the
motion of the feed roller.
Paper feeds horizontally under the printheads on the carriage as it is kept level on the platen to prevent cockle.
b) Sensors
The paper feed assembly includes sensors for detecting the status of paper feeding and that of the mechanical components that make up the paper passage.
For more details, see TECHNICAL REFERENCE > Detection Functions with Sensors.
c) Roll media spool drive
The paper feed assembly is complete with a roll media spool drive unit to prevent roll media from slacking as they feed. The roll media spool drive unit rewinds
roll media by turning on the spool clutch. The spool clutch turns on only when roll media feed rearward. Driving force is imparted from the feed motor to rotate the
roll holder for rewinding the media. The spool clutch remains off when roll media feed forward.
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Feed roller HP sensor
Printhead
Roll media
Release lever
Feed roller
Pinch roller
Roll holder
Spool clutch
Media sensor
Feed roller encoder
Feed motor
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