Theory Of Operation; Introduction To System Theory - Pitney Bowes DI380 Series Service Manual

Note:
Before any job commences, it is assumed that all the appropriate trays are filled to complete
the sequences described below.
Please refer to relevant diagrams in section 10- Diagrams
3.1

INTRODUcTION TO sYsTeM THeORY

The DI380/SI3300 and DI425/SI3500 are low volume easy to use Folding/Inserting machines, each
available in 3 variants (1, 2 and 3 station machines).
The sheet feeder(s) have self centring guides and automatic separation based on photo copier
technology. Therefore the documents do not require shingling before the they are presented to the
separator roller and pad. The sheet feeders have a sprung lift plate that lifts the weight of the documents
up to the separator roller to ensure only a single document is fed.
The insert feeder has a more traditional type of separation, by means of a manual height adjustment
and a stone/shield setting that is operator settable. This is to enable diverse material to be processed
through the insert feeder.
The envelope feeder will automatically separate a stack of envelopes to ensure only a single envelope
is fed. The separator height is set by the engineer.
When the Start button is pressed, a single sheet is fed into the paper path and driven into fold plate
1. When the sheet reaches the deflector stop, the paper is buckled. This buckled edge is then pulled
through fold rollers 2 and 3 which creates the first fold. It then enters fold plate 2 until it reaches the
deflector stop, where the sheet is buckled again. The edge is pulled into fold rollers 3 and 4, creating
the second fold. At this stage, if an insert is programmed as part of the job, the insert will 'fired' into the
waiting document.
The envelopes are fed flaps up and trailing through the flapper unit where the envelope flap is peeled
away from the body of the envelope.The envelope then passes through to the Q station area where it
is stopped. The flap of the envelope is held back by the brush. The envelope is opened when the flipper
fingers press down on the back of the envelope and four insertion fingers enter the envelope throat.
The folded sheet (package) at fold rollers 3 and 4, travels through the transport plate rollers and is
driven into the waiting envelope by the insert drive rollers. Once the insert fully enters the envelope,
the Q station fingers lift up and the package then travels along to the sealer rollers where moisture is
applied to the envelope flap. The body of the envelope is forced up into the inverter stop, this in turns
forces the envelope back into the nip of the sealer rollers and presses the flap against the body of the
envelope.
The envelope activates the exit switch as it passes the exit rollers and increments the counter by
one.
SDT333A DI380/DI425/SI3300/SI3500 Service Manual
3 • Theory of Operation
3 • Theory of Operation
3-1