Okidata Microline 520 Service Handbook
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Brand: OKIDATA
Category: Printer
Type: Service handbook
Model: OKIDATA Microline 520 , OKIDATA Microline 521
Pages: 321
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.
Position of Change
Lever
Status of Front
Pressure Roller
Tension of Front
Pressure Roller
Status of Rear
Pressure Roller
Tension of Rear
Pressure Roller
Bottom OPEN N/A OPEN N/A
Top CLOSED 250 g CLOSED 700 g
Rear CLOSED 90 g OPEN N/A
2-2-05A.tif
Principles of Operation 2 - 30 Microline 520/521 Service Handbook
P/N 59257803