Canon LBP-860 Service Manual page 93

CHAPTER 2
When it receives a 2nd Start command, the
envelope feeder driver PCB runs the motor
backward for about 2.8 seronds to feed the
envelope again.
The upper separation roller is driven via a
torque limiter by th? motor, which imparts
a tur-ning moment in the direclion of
r o t a t i o n o f the p i c k - u p a n d l o w e r
separation rollers [in the direction of the
white arrow in Figure Z-52).
When a single envelope is fed, however,
rotate in the opposite direction (in the
direction of the black arrow in Figure 2-521
by the movement of the envelope, which is
driven by the lower separation roller.
Since the friction between the envelopes
is weak when two or more envelopes are
fed simultaneously
rotating force of the lower roller is not
strong enough to cause the upper roller to
rotate in the same direction as it is
rotating. The upper roller rotates in the
direction of the white arrow in Figure 2-52.
and the envelope on the bottom of the
feeder passes through while the others are
returned to the feeder.
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Power-ON
(multi-feed). the
Figure 2-51
Upper separation roller
Lower separation roller
Upper separation roller
Normal
Lower separation roller
Upper separation roller
Multifeed
Lower separation roller
Figure 2-52