Accumulation From Main Sheet Feeder - Pitney Bowes DI380 Series Service Manual

3 • Theory of Operation
3.8

AccUMULATION FROM MAIN sHeeT FeeDeR

After a trial piece has been processed and the start button is pressed, the sheet feeder motor (M1) is
switched on. This feeds a sheet over the Double Document Detector (DD1) sensor and stops it, after
a counted delay, in the collation nip. This results in the sheet being slightly over driven.
At the same time, the envelope motor (M9) is switched on and an envelope is fed through the separator
pad and roller. When the lead edge of the envelope moves forward to the envelope sensor (S1), the
software sends the signal to turn on the collation motor (M5). The transported envelope stops in the
insertion area at a predetermined time according to the size of envelope programmed within the job
setup.
The insertion solenoid (L1) energizes, followed by the hold down solenoid (L2), and finally, by the shoe
horn solenoid (L3).
Depending on fold type the sheet will be fed through the fold rollers and fold plates.
The folded sheet enters onto the pivot plate this moves the flag out of sensor (OP5). When the folded
sheet is fully inserted, the pivot plate moves backwards returning the flag to its home position this de-
energizes the hold down solenoid (L2) and the shoe horn solenoid (L3)
L3 energizes again placing the shoe horn back into the envelope lifting the previous folded documents
up.
The software sends the signal to turn on the collation motor (M5) sending the next sheet down through
the fold rollers and fold plates onto the pivot plate. This happens until the predetermined sheets are
inserted into the envelope. After the last document has entered the envelope the pivot plate moves the
flag out of the sensor (OP5).
This operation then triggers the software to energize the finger solenoid (L4), lifting the fingers and
lifting the brush of the sealer by energizing solenoid (L5) and the insertion solenoid (L1). The shoe horn
at this point stays energized until the package passes the moistener sensor (S3).
The envelope is driven from the insertion area into the sealer area. The next envelope is fed when the
lead edge of the envelope pushes the moistener sensor (S3) forward (the software will be Incremented
by a count of 1 for the EIU). The envelope then enters the inverter area and finally exits into the
stacker.
The exit sensor (S4) will increment the mechanical counter (located behind the manual advance knob
door) by 1.
In normal run mode, if no material has been detected at the Double Document Detection sensor, the
sheet feeder motor (M1) will time-out after approximately 2 seconds. This is to clean the separator
roller and pad. In 'daily mail' (manual feed) mode, this time is increased to approximately 20 seconds
for operator loading. The manual feed lever opens the gap between the separator roll and pad.
This sequence is shown in flow chart form on the following page.
3-14 SDT333A DI380/DI425/SI3300/SI3500 Service Manual