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Operating Principles
Service Manual
Paper Feed Mechanism
Figures 2-7, 2-8, and 2-9 show the paper feed mechanism. After you load paper, it is fed by the
tension roller, PF roller, and front or rear tractor assembly. The PF motor rotates the tension roller
and tractor select gear (Figure 2-7) and moves either the front or rear tractor assembly. The rotation
of the paper feed transmission gear rotates the tractor select gear, which can engage either tractor
train. The tractor select mechanism alternates the engagement of the rear tractor assembly gear
train and front tractor assembly gear train. (Refer to Section 2.1.5,
Feed
Tractor Select
Mechanisms, for more information.)
The front and rear PE sensors are incorporated in the tractor sprocket. When paper is loaded, the
paper pushes the leaf spring and blocks the photo interrupter. When no paper is loaded, the photo
interrupter is not blocked. The top PE sensor is attached to the upper paper guide and is used with
the reflection plate on the paper bail assembly. When paper is loaded, the paper surface reflects the
beam; when there is no paper, the beam is absorbed (not reflected). The pull tractor sensor
monitors whether the pull tractor is installed.
SENSOR
TRACTOR
SENSOR
PE, UPPER
APER BAIL LEVER
TIMING BELT,
TRACTOR SELECT
TRANSMISSION GEAR
, ,
. .
@=-4/
PAPER FEED MOTOR
Pinicon Gear
Figure 2-7. Tension Roller and PF Roller Operation
Rev.
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