Chapter 22-242.3.3.2 Paper Path2.3.3.2.1 Structure of Feed Roller Unit0024-9813a) Paper feed assemblyThe 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 themotion 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) SensorsThe 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 pick-up drive unitWhen the roll media feeds, the roll media pick-up pressure clutch 1 turns on to actuate the torque limiter in the pick-up drive unit. Thus the back tension works toprevent the roll media from sags or skew.At this time, if the paper tube of roll media is inside diameter of 3 inches, the pick-up pressure solenoid and roll media pick-up pressure clutch 2 turn on to increasethe back tension (about 2.6 times higher than before).F-2-20Feed motorRoll media pick-uppressure clutch 1Roll media pick-uppressure clutch 2Pick-up pressure solenoidFeed rollerHP sensor Feed rollerencoder sensorRoll mediaRelease leverRoll holderMedia sensor Pinch rollerFeed rollerPrinthead
