HP Indigo press 3050, User Manual, Page: 152 / 288

ENWW
Paper transport subsystems 151
Duplex placement accuracy
Grain direction
For duplex or simplex printing, use long-grain sheets for paper types lighter than
170 g/m
2
(115 lb text/63 lb cover). For paper types between
170 g/m
2
(115 lb text/63 lb cover) and 200 g/m
2
(74 lb cover), use short or long grain
sheets. For paper types heavier than 200 g/m
2
(74 lb cover), use short grain sheets.
Sheet trimming
Before you load the substrate on the feed tray, make sure that the sheets are trimmed
correctly and are not stuck together. If necessary, trim the stack on two axes (top and left
edges), and then fan the sheets before using them.
Note Make sure the blade is sharp. Using a blunt blade will cause paper jams.
Sheet size
When using a new paper stack, verify that the sheet size is identical to the size defined in
the substrate list. Make sure that the size of the sheets used in the main tray and the
secondary tray are identical.
Paper transport subsystems
Paper feed unit
The paper feed unit consists of the paper elevator, a set of blowers, suction fingers, and
sheet separators. The main function of this subsystem is to separate a single sheet from
the paper stack and feed it to the paper transport system.
Feed conveyor
The subsystem transports the sheet from the paper feed unit to the grippers. It ensures
correct alignment of the sheet before feeding it to the paper grippers.
Figure 11-1. Duplex placement accuracy
(0.015 inch)
Range of point on back
0.4 mm
0.8 mm (0.03 inch)
Maximum back-to-front point
deviation—0.4 mm (0.015 inch)
Point on front
0.8 mm
(0.03 inch)