Download USPS DM300c Service manual

3 • Theory Of Operation
3.4 Envelope/
Tape Transport
Sequence of Operation (cont’d)
Operating Sequence—DM300c. For the discussion that follows, refer to
the Transport Timing Diagram (Figure 3-18) below and the DM300c Envelope Print Diagram (Figure 3-19) on the following page.
The operating sequence for the DM300c is essentially the same as that for
the DM400c, with the obvious difference that the autofeeder, and therefore
sensors FS1 and FS2 are not present.
1. When PS1 detects the lead edge of an envelope, the print carriage
moves to the print position as described in step 1 for the DM400c sequence.
2. When the print carriage is in the print position, the transport motor
starts and feeds the mailpiece or tape up to the PS2/PS3 skew detect
sensors. From this point on, the process is virtually identical to that described earlier in steps 3 through 7 of the DM400c operating sequence.
Encoder
1651 (Pulse/Revolution)
Encoder Resolution : 0.085 (mm/pulse) = 300dpi
Tape Feeder
57.5 6.5
33
Optional
Moistener
PS1
63
29
70
PS2 and 3
24 [IPS]
(609.6
[mm/sec])
51
105
51
25
Figure 3-18 Transport Timing Diagram — DM300c
3-18
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)