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Service Guide ML520/521
Chapter 2 Principles of Operation
2.2.05 Line Feed Mechanism
The line feed operation is accomplished by activating the line feed motor which turns the platen.
The rotation of the platen is used to feed paper from the selected paper path.
The components of the paper feed mechanism are listed below.
Line Feed Motor (pulse motor), with gears
Line Feed Idler Gear
Platen
Rear Tractor Feed Unit
Pressure Roller
Change Lever (Paper Path Selection Lever)
The change lever is used to select one of three different paper paths; top, rear or bottom.
Paper Clamp Mechanism
Moving the change lever between the bottom, top and rear positions, changes the positions of the front
release gear arm and the release cam.
The movement of the front release gear arm changes the position of the front release gear shaft. This
causes the front pressure roller to open or close.
The movement of the release cam causes the rear pressure roller to open or close.