Pitney Bowes DM300c Service Manual page 77

3.10 DM475
Feeder/WOW
Theory
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
Sequence of Operation
1. When the Start key is pressed in WOW Mode or Weigh First Piece Mode,
first the feeder/WOW main board's motion control processor (MCP) down-
loads the weight breaks from the G900 main board's Rate Manager. Then
the WOW is re-zeroed and the width sensors are recalibrated. The WOW
will also pause to be re-zeroed every four minutes during a run.
2. The first mail piece is fed onto the WOW deck and is stopped when the
trail edge has passed FS2/WS1. The actual stopping position is depen-
dant on the mail piece length.
• For most letter sized pieces – mail that is greater than 9.05" (230
mm) but less than 13.18" (335 mm), the trail edge parking position is
consistently 1.97" (50 mm) from FS2/WS1.
• For long mail pieces – mail that is greater 13.18" (335 mm) must be
stopped before entering the printer, therefore the trail edge of the
envelope will stop 0.275" (7 mm) from FS2/WS1.
• For short mail (mail that is less than 9.05" (230 mm) – the trail edge
position is variable.
- For the first mail piece, the trail edge of the envelope will stop
1.97" (50 mm) from FS2/WS1.
- For subsequent mail pieces, the trail edge position depends on
the position of the previous mail pieces. The mail will stop when
the trail edge of the previous piece has cleared the end of the
WOW deck and the current piece is past 1.97" (50mm).
3. When the mail piece's trail edge has reached the correct position (see
above description), the envelope stops transporting momentarily. This
hesitation is very brief, but is long enough to allow vibration to subside
and the weighing algorithm to decipher the weight of the mail piece.
4. The feeder/WOW board's machine motion controller (MMC), which is
holding the rate structure as a set of weight breaks, reports the correct
weight break and shape dimensions back to the G900 main board's Rate
Manager where the price is selected and provided to the meter (PSD).
5. The meter deducts the proper dollar amount and sends the print data to
the ink jet printer for meter imprint.
6. The first mail piece must have left the WOW transport before the sec-
ond crosses the WOW middle sensor (WS2) to ensure that one mail
piece at a time will be on the transport when weighing occurs. The sep-
arator/takeaway rollers hold back the next mail piece so that only one
piece at a time is on the WOW to be weighed. The three units; feeder,
WOW and printer are run at different speeds in order to control the gap
between media and insure one piece on the WOW at a time. For example:
Feeder:
WOW transport:
Printer transport:
3 • Theory Of Operation
23.5 ips (inches/sec), at TAR 2
23.75 ips
24 ips
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