Delivery System Priniciples

Front 1

Delivery Systems

Back 1

begins when sheet leaves the final impression cylinder. usually for smaller presses delivered to tray.

Front 2

chute delivery

Back 2

for larger high speed presses, paper delivered by gripper bars, chain delivery, deliver sheets that lower depending on thickness of paper

Front 3

typical components of Delivery System

Back 3

1. Receiving stacker- table that automatically lowers
2. Delivery Gripper Chians- loop set of chains,
3. Delivery Gripper Bars- attached to end of delivery chains, contain grippers that hang on to sheet when being printed
4. Delivery Cylinder- peers the chain delivery- transfer sheets from last printing cylinder to the delivery sheet
5. Paper Guides- fixed guides @ rear and sides of delivery sheet
6.Side jogger- moves and jogs the sheets against the fixed guides
7. Rear Jogger- moves/jogs sheets against the front gate
8. Delivery Grippers- take printed sheets from cylinder grippers and transports to delivery pile

Front 4

Adjusting the Joggers

Back 4

3 movable devices- 2 side joggers, 1 rear jogger
-adjust to size of paper being printed

Front 5

Delivery Assist Device

Back 5

(slow down rollers)
creates drag/ friction to sheet to slow down
blows air to paper to separate sheets
sheet decurler- pair of rollers with vacuum in middle - decurls the paper

Front 6

paper jams

Back 6

remove paper jam manually - examine sheet to determine problem

Front 7

setoff

Back 7

wet ink on top of sheet is transferred to back of sheet

Front 8

blocking

Back 8

2+ sheets of paper get stuck together

causes- heavy ink coverage, heavy pile of paper
solutions- spray powder in-between each sheet, putting paper in racks (metal L shaped racks)- 4in paper, rack, 4in paper

Front 9

too much spray powder

Back 9

=sand paper
clogged press parts
debre, printing defects
health problems if inhaled

Front 10

paper travel

Back 10

refers to conveyer system and guide elements and monitoring systems
-ensure smooth and accurate travel

Front 11

feeders

Back 11

each sheet of paper is exactly the same (position) each time
-18000/hr

Front 12

single sheet feeders

Back 12

sheets are lifted @ FRONT edge transported to front stops and side guide
-air nozzles and sheet separated
-double sheet detector

Front 13

stream feeders

Back 13

-suction head lifts TAIL edge of sheet, blasts air between each sheet and pile, to delivery

Front 14

setup of feeder determined by

Back 14

paper thickness/caliper
surface texture
porosity
wavy and tight edges