Service manual

Feed Belt
The Main Feed Belt is a one inch wide tan timing belt which drives the
bottom sheet of paper under the singulator roller. Also called Singulator Belt.
Auxiliary Feed Belts
These are the two urethane belts located either side of the main feed belt.
The auxiliary feed belts assist the main feed belt, smoothing variations in
frictional drive (correcting erratic feeding of the paper).
Drive Rollers
These two rollers are located directly below the singulator. These are used
in conjunction with the singulator to ensure only one sheet is fed at a time.
Paper Level Detector
Also known as the demand switch, monitors the paper going into the feeder
area. It’s job is to limit and demand the amount of paper that is most
productive to the feeding process. The Paper Level Detector monitors the
paper through a metal wand.
Singulator
The singulator is a two inch stationary roller which rests above the feed belt
in the center of the feeder and allows only the bottom sheet of paper to be
fed while holding back all others.
A.2b SENSORS
Feed Sensor
The Feed Sensor monitors the output of the singulator for proper singulation
or non-feed of paper. It is a light-actuated through-beam sensor, identified by
an “F” on the top. The sensor is located on the left paper rail in the feeder
section.
Double Detect Sensor (Prior to October-2005)
The Double Detect Sensor monitors the output of the singulator for double
feeds. It is a light-actuated through-beam sensor, identified by an “D” on the
top.
Start Read Sensor
The Start Read Sensor detects the leading edge of the paper to set the
distance to the first mark in the read code block
INTRODUCTION
420T V6LT OPERATOR & SERVICE MANUAL ISSUE 2009/06 Rev. 6/21/2011 SECTION A – PAGE 13
071-33370-400
Singulator Assembly