Pitney Bowes DM300c Service Manual page 35

3.4 Envelope/
Tape Transport
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
DM400c/DM450c/DM475 Autofeeder Transport (cont'd)
Feeder Motor. This is a DC motor
driven with discrete devices resi-
dent on the feeder PCB. The mo-
tor is connected to the feeder PCB
through J306 (DM400c/DM450c).
NOTE: The feeder motor has an
added temperature sensor connect-
ed to J312 that is not used on the
printer or WOW transport motors.
Drive System. The motor drives
the feeder's disc encoder through a
timing belt and all other drive com-
ponents through a system of belts
and pulleys as shown in Figure 3-3B.
Drive is transferred to front-mounted
components via through shafts.
Feed Deck. The feed deck is
equipped with eight feed rollers that
drive the bottom piece of the stack
into the separator unit. All rollers
have tires with a relatively high coef-
ficient of friction (i.e., they're sticky)
to provide positive drive of the mail
piece (the different colors of the tires
correspond to different coefficients of
friction). In addition, the first roller set
is equipped with plastic cams that
jog the stack.
The stack is confined by the rear
wall, the entrance guide, which acts
as a feed fence, and an operator
adjustable side guide which is nor-
mally set to within 1/16 inch of the
stack edge.
These components together form
the feed hopper.
NOTE 1: The 1/16 inch is a critical
setting. Failure to set the side guide
can cause binding of the mailpiece if
too tight, or skewing if too loose.
NOTE 2: Stack weight must not
exceed two pounds or three inches
in height (capacity of stacker), other-
wise belt skipping and misfeeds will
occur.
3 • Theory Of Operation
Figure 3-3A Auto Feeder Drive Motor
Figure 3-3B Drive System, Rear
Figure 3-3C Feed Hopper Components
Figure 3-3D Feed Deck, Underside, Show-
ing Drive Components
3-5